commit 1af9ec317232eaef3dfc57a5b69d48b27874082e
Author: Mats Törnberg <mats.tornberg@gmail.com>
Date:   Sat Oct 31 22:34:48 2026 +0100

    Add on-page editor for the go-graph-cms
    
    Injectable React editor that is side-loaded onto the statically rendered
    page and edits through the CMS HTTP API (POST /api/edit).
    
    - Shadow-root UI over server HTML; patches morphed in, undo/redo from
      server inverses (reuses @k6n/cms-editor EditClient/morph/markdown editor)
    - Sign-in via go-auth device grant as the CMS client (aud matches), token
      refresh + 401 retry; live preview swapped in on load and on tab focus
    - Schema-driven property form (arrays, maps, variants, $ref, validation)
    - Every string property editable where it is rendered (value-bound inline
      fields and attribute chips), markdown WYSIWYG for marked fields
    - Block palette + drag & drop with ghost drop targets, insertion slots,
      sort snapping between siblings (Alt to nest)
    - x-style annotations: on-page padding/margin/gap handles, Style panel,
      wrap-in-layout; x-graph label/group for titles and grouping
    - Dev workflow: Vite proxy to the live site (token injected server-side)
      or an offline in-memory mock CMS; jsdom test suite
    
    Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

diff --git a/.env.example b/.env.example
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+# Which CMS the dev server talks to:
+#   live (default) - proxy everything to CMS_TARGET (page HTML is fetched server-side and the editor is injected)
+#   mock           - fully offline: in-memory CMS + fixture page (same as `npm run dev:mock`)
+CMS_MODE=live
+CMS_TARGET=https://k6n.net
+
+# Auth for the dev proxy. The proxy adds these to every upstream request, so the
+# secret never reaches the browser or the bundle. Use ONE of:
+#   CMS_TOKEN   - an OIDC/device-flow JWT          -> Authorization: Bearer <token>
+#   CMS_API_KEY - a minted key with write scope    -> X-API-Key: <key>
+#   CMS_COOKIE  - the admin session cookie string  -> Cookie: <value>
+# Easiest: log in to the backoffice, copy `accessToken` from localStorage['auth.tokens'].
+CMS_TOKEN=
+CMS_API_KEY=
+CMS_COOKIE=
+
+# Location of the shared @k6n/cms-editor package sources (EditClient, morph, markdown editor).
+CMS_EDITOR_SRC=../ecommerce/backoffice/web/packages/cms-editor/src
diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+node_modules
+dist
+.env
+.env.local
diff --git a/README.md b/README.md
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+# cms-onpageeditor
+
+Injectable on-page editor for the go-graph-cms (`docs/onpage-editor.md` in that repo).
+It is side-loaded onto the statically rendered page, mounts its UI in a shadow root, and
+edits **only through the HTTP API** (`POST /api/edit`, with undo/redo from server inverses).
+The page DOM stays server HTML: edits come back as `patches` and are morphed in.
+
+Reused from `@k6n/cms-editor` (aliased to the sources in the ecommerce repo, see `CMS_EDITOR_SRC`):
+`EditClient`, `applyPatches`/`morphChildren`, and the Tiptap `mountMarkdownEditor`.
+
+## Develop
+
+```sh
+npm install
+npm run dev:mock     # offline: in-memory CMS + fixture page, no login   -> http://localhost:5173
+cp .env.example .env # then set CMS_TOKEN (or CMS_API_KEY / CMS_COOKIE)
+npm run dev          # live: proxies https://k6n.net, injects the editor from source (HMR)
+npm test             # editor + mock CMS in jsdom
+npm run build        # dist/onpage-editor.js (what the site serves at /editor/onpage-editor.js)
+```
+
+**Live mode.** The proxy fetches page HTML server-side, strips the CSP, injects
+`/src/dev.ts`, and forwards cookies. `dev.ts` sets `cms_preview=1`, so the edge renders
+`/api/preview` - the page you see is the live store, not the published file. The dev server
+must run on **port 5173** (`strictPort`): go-auth's CORS allowlist names `localhost:5173`.
+
+## Signing in
+
+The editor has its own login (`src/auth.ts`, UI in `src/ui/LoginPanel.tsx`) using go-auth's
+RFC 8628 device grant, as described in go-auth's `/dev-auth.md`:
+
+1. The page loads as a normal visitor page; the editor probes `GET /api/auth/me`, gets 401 and shows **Sign in**.
+2. *Sign in* starts a grant (`POST {issuer}/api/auth/device`), opens the approval page and shows the user code.
+3. You approve on the issuer (admin-gated); the editor polls (honouring `interval` / `slow_down`), stores the tokens,
+   re-fetches the page in preview mode and unlocks editing.
+4. Access tokens (~15 min) are renewed with the rotating refresh token; a 401 triggers one refresh + retry, and a
+   failed refresh returns to the login panel. *Sign out* (⎋) clears everything.
+
+The issuer and client come from `GET /api/auth/config`. The grant is run **as that client** (`k6n-admin` on k6n.net): the CMS verifies
+`aud` against its `OIDC_CLIENT_ID` (`cms.go: auth.NewOIDC(issuer, clientID)`), while go-auth's clientless fallback (`dev-console`) mints
+`aud=https://otel.k6n.net` and gets `401 oidc: wrong audience`. Override with `__CMS_EDITOR_CONFIG__.clientId` / `.audience`. A rejected token's
+reason is shown in the login panel. Storage: in **dev** the refresh token is kept in `localStorage`;
+in **production builds** it is only held in `sessionStorage` (go-auth's rule: never persist it there). An already
+valid backoffice login (`auth.tokens`) is picked up too. Fallbacks: *Use an access token instead* in the panel,
+or `window.__CMS_EDITOR_CONFIG__ = { token | apiKey | issuer }`.
+
+In dev the access token is also POSTed to the dev server (`/__dev/token`) so its server-side page fetches are
+authenticated as you. To skip the browser login entirely, put `CMS_TOKEN` / `CMS_API_KEY` / `CMS_COOKIE` in `.env`
+(they win), e.g. `CMS_TOKEN=$(node ../ecommerce/go-auth/scripts/dev-token.mjs token)`.
+
+`CMS_MOCK_AUTH=1 npm run dev:mock` makes the mock require the same flow (approve on the mock `/device` page), so
+the login UI can be developed offline.
+
+**Mock mode.** `mock/` is a small in-memory implementation of `/api/edit` (insert, set, move,
+delete, restore, duplicate; inverse ops; 409 on stale `version`; atomic rollback),
+`/api/nodes`, `/api/schemas`, `/api/types`. Fixture schemas/templates live in
+`mock/fixtures.ts` - add a node type there to try a new editor. `POST /__mock/reset` resets it.
+When the real server behaves differently, fix the mock first, then the editor.
+
+**Dev panel** (`` ` `` or the gear): every request with bodies/timings, the selected node + schema,
+and everything registered. `window.__cmsEditor` exposes `ctrl`, the registries and `destroy()`.
+
+## Adding editors (the extension points, `src/registry.ts`)
+
+```ts
+// A dialog for a node type (shows up as a toolbar button; same id replaces a built-in)
+registerEditor({ id: 'hero', label: 'Hero', icon: '★', match: 'hero', component: ({ node, schema, ctrl, close }) => ... })
+
+// Ad-hoc: attach to any block by selector / node id / element
+attachDialog('.pricing-table', MyPricingDialog, { label: 'Prices' })
+
+// A form widget for matching schema fields (x-editor, format, path...)
+registerFieldEditor({ id: 'colour', match: (s) => s['x-editor'] === 'colour', component: ColourField })
+
+// Inline editing for a `data-cms-editor="<id>"` field (built in: text, markdown)
+registerInlineEditor({ id: 'richtext', start({ el, node, field, ctrl }) { ...; return { stop() {} } } })
+```
+
+Components get the `Controller`: `ctrl.setData / insert / remove / duplicate / nudge / apply(ops)`,
+`ctrl.openDialog(...)`, `ctrl.node(id)`, `ctrl.schema(type)`.
+
+## The form (`src/form/`)
+
+Covers what the CMS schemas use: nested objects, `$ref`/`$defs`, `allOf`, nullable unions, `oneOf`/`anyOf` variant pickers
+(discriminator `const`s are set for you), **arrays** (primitive rows; object cards with a summary title, drag/up/down reorder,
+duplicate, remove, `minItems`/`maxItems`; `uniqueItems`+`enum` as checkboxes), **maps** (`additionalProperties`, free keys with
+rename/add/remove, or a fixed vocabulary via `x-dict-keys` / `x-editor: dictionary`), `x-group`/`x-groups` sections,
+`x-advanced` toggle, and the `x-editor` hints `hidden`, `readonly`, `json`, `markdown`/`textarea`/`monaco`/`html`/`richtext`,
+`asset` (thumbnail), `node`. Unknown `x-editor` values fall back to the type's normal widget; tuples and unmodelled shapes get
+a JSON box that keeps invalid text instead of losing it. Optional fields that are cleared (`''`, `[]`, `{}`) remove their key.
+Client-side validation (required, lengths, pattern, bounds, item counts, email) marks fields inline and disables Save; the
+server's schema validation stays authoritative. Not covered: `if/then/else`, `patternProperties`, `dependentSchemas`
+(they show up under "not in the schema" / JSON). Specialised backoffice editors (finder-item, tracking-event, layout-settings,
+style-class, sizes) are not ported - register one with `registerFieldEditor` where needed.
+
+## Seeing the latest content (preview)
+
+The preview cookie makes the *edge* route page URLs to `/api/preview`, but a plain navigation can't carry the editor's bearer
+token, so the edge may still serve the published file. The editor therefore fetches the live render itself and morphs it into
+the page (no reload; scroll, focus and open dialogs stay): on load when signed in, after signing in, and whenever the tab becomes
+visible again (throttled to 5 s). Source order: `GET /api/preview?path=<path>`, then the same with `&locale=<html lang>`, then
+the page URL with `X-CMS-Preview: 1`. Visitors who are not signed in are never touched.
+
+## Editing on the page
+
+- **Every string property is editable where it is rendered.** Templates only mark a few fields (`data-cms-field` +
+  `data-cms-editor`); for the rest, selecting a block binds its data to its DOM *by value* (`src/page/infer.ts`): a property
+  whose text is exactly one leaf element becomes an inline text field (nested arrays/objects included: `links.0.text`), and one
+  whose value is exactly one attribute (`href`, `src`, `alt`, `title`…) gets a chip that edits it. Click a block to select it,
+  click a field again to edit. Ambiguous values (same text twice, one value on two properties) are skipped rather than guessed, and
+  enums, markdown/html fields and read-only fields are never bound as text - those stay in Properties (or need a template marker,
+  e.g. `data-cms-editor="markdown"` for the WYSIWYG editor).
+- **Block palette** (dock ▸ Blocks): every type that fits somewhere on the page, plus blueprints. Drag onto the page - a ghost
+  "virtual element" and a drop line show where it lands, and containers whose `x-graph.children` does not accept the type refuse it -
+  or click to add to the selection. Existing blocks drag the same way from the toolbar grip, and **sort by snapping between their siblings** (root nodes included): faint markers show every position, the line snaps to the nearest, and the block is only nested into a container under the pointer while **Alt** is held.
+- **Insertion slots**: a selected or hovered container shows "+" between its children (and a big "Add block" when empty).
+- **One dialog per thing**: opening Properties/Style/an attribute editor/an insert picker that is already open raises it, pulses it and focuses its first field (unsaved edits are kept) instead of opening a duplicate; clicking a dialog brings it forward and Escape closes the topmost. Custom dialogs opt in with `ctrl.openDialog({ id, ... })`.
+- The toolbar keeps the everyday actions; **JSON** and other developer tools live under **…** (`placement: 'menu'` on a
+  `registerEditor`). Icons are inline SVG (Material Design Icons via `@mdi/js`, tree-shaken, no font/CSP issues); `registerTypeIcon`
+  gives a node type its own.
+
+## Titles and groups (`x-graph`)
+
+A schema's `x-graph: { "group": "Commerce", "label": "title" }` drives the UI: **`label`** names the property whose value is the
+node's title, shown in the outline, hover tag, toolbar chip, dialog titles and drag chip (types without a label fall back to the
+type name); **`group`** categorises the type in the block palette and the insert picker (groups are collapsible; types without one
+land in "Other") and is shown next to the type on hover. The block list shows each type's schema `title` with the type id underneath, and skips page-root (`staticRoot`) types. One `GET /api/types` request (which carries every type's schema) supplies titles, groups, labels and acceptance rules for the whole list. Node data for the titles arrives in one `GET /api/tree/{root}` request,
+stays live as you edit, and is fetched lazily for new nodes.
+
+## Styling (spacing, flow, gap)
+
+Schema-driven via the `x-style` annotation, with on-page drag handles, a Style dialog and wrap-in-layout. Design and the
+schema contract: [docs/styling.md](docs/styling.md).
+
+## How it behaves
+
+- Drag the ⠿ grip on the selected block to reorder / re-parent (green line = drop position); deleting shows an Undo toast.
+- Click selects (links don't navigate in *Editing*; use *Browsing* to follow them); double-click a
+  field with `data-cms-editor` edits in place (`text`: contenteditable, `markdown`: Tiptap), otherwise
+  opens Properties. Typing is debounced and coalesced into one undo step.
+- Properties = schema-driven form (`src/form/`), saves only the diff with the node `version` (409 -> conflict toast).
+- Insert menu = `x-graph.children` of the parent schema + blueprints.
+- `data-cms-edge` isn't emitted by the templates yet, so the edge is resolved via
+  `GET /api/nodes/{id}/edges` (and used automatically once the attribute appears).
+- Patches with `error` (e.g. the page node itself) trigger a soft re-fetch + morph of the page.
+
+## Deploying
+
+Serve `dist/onpage-editor.js` at `/editor/onpage-editor.js` and let the existing loader do
+`if (document.cookie.includes('cms_preview=1')) import('/editor/onpage-editor.js')`. The bundle
+re-checks the cookie, so loading it for a visitor is a no-op.
+
+## Not done / next
+
+- Real-browser e2e (Playwright against `dev:mock`) - only jsdom is covered so far; CSS/shadow-DOM look and Tiptap have not been checked in a real browser.
+- Drag reorder is vertical-flow only, and assumes `move`'s `index` counts siblings excluding the moved block (as the mock does) - verify against the real server.
+- Bundle is ~295 kB gzipped, mostly Tiptap; split the markdown editor into a lazy chunk if that matters.
+- The mock doesn't implement `graft`/`blueprint`; the picker lists blueprints but they only work on the real server.
diff --git a/docs/styling.md b/docs/styling.md
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+# Styling on the page: flow, padding, margin, gap
+
+## Decision
+
+**Keep the typed token object on the node; tag its fields with `x-style`; let on-page editors key off the tag.**
+
+Not a free-form `style` object on every node, and not per-node CSS: the k6n design system (`data/k6n/design.md`) already says
+*blocks own no outer margin, spacing comes from the parent layout, spacing values are tokens (`none xs sm md lg xl`) and never raw
+lengths*. The `layout` node is that primitive: `flow`, `columns`, `gap`, `padding(Top|Bottom)`, `margin(Top|Bottom)`, `align`,
+`justify`, `tone`, `border`, `reveal`, and `responsive.{mobile,tablet,desktop}`. The template turns those into `.k6n-gap-md` /
+`.k6n-p-lg` helper classes. So:
+
+| Option | Verdict |
+|---|---|
+| Generic `style: {…}` on every node | **No.** Every template would have to consume it, it re-opens raw CSS in class attributes, and it contradicts "blocks own no margin". |
+| `style-class` nodes (named CSS class, linked by edge) | **Keep, but not for on-page tweaks.** Shared by design (blast radius = every layout that links it) and emitted into `<style>` in the head, which a per-node patch cannot refresh. Good for reusable surfaces (`tone`, `border`); edit them in the dialog. |
+| Per-type editor code ("if layout then …") | **No.** Every new block type would need editor changes. |
+| **`x-style` on schema properties** | **Yes.** The schema already is the source of truth (`x-graph`, `x-editor`); one `set` op per change (undo/redo, coalescing, 409 all free); any type opts in by annotating a field, zero editor code. |
+
+Blocks that have no style fields (hero, text, …) get spacing by being **wrapped in a layout** — one atomic batch
+(`insert` layout + `move` block into it), undone in one step. The wrapper type is the schema tagged `x-style.wrapper`.
+
+## `x-style` (schema contract)
+
+On a property:
+
+```json
+"paddingTop": {
+  "type": "string", "enum": ["none","xs","sm","md","lg","xl"],
+  "x-style": { "kind": "spacing", "box": "padding", "side": "top", "overrides": "padding", "token": "--k6n-sp-{value}" }
+}
+```
+
+| key | meaning |
+|---|---|
+| `kind` | what the field *is*: `spacing` `gap` `flow` `columns` `align` `justify` `tone` `border` `reveal` `choice` |
+| `box`, `side` | spacing only: `padding`/`margin` × `all top bottom left right x y` |
+| `overrides` | sibling this field wins over (`paddingTop` over `padding`); drives the "inherited" display and which field a handle edits |
+| `token` | CSS custom property template that resolves an enum value to a length. The editor measures real pixels from the page's own CSS (so fluid `clamp()` tokens are right) and snaps drags to the nearest token |
+
+On the schema root: `"x-style": { "wrapper": true }` marks the type blocks can be wrapped in.
+
+`responsive.<bp>.<field>` (the `$defs/breakpoint` properties) are matched to base fields by name: those fields get a breakpoint tab
+and write to `responsive.<bp>.<field>`. Today only `flow` and `columns` are declared there - the template has classes for nothing else.
+
+**Fallback.** For schemas without `x-style` (e.g. production before the annotated schemas deploy) the editor infers the same
+descriptors from the property name + enum (`gap`, `padding|margin(Top|Bottom|Left|Right|X|Y)` with a `none…xl` scale, `flow`,
+`columns`, `align`, `justify`, `tone`, `border`, `reveal`) and says so in the panel. The wrapper tag is never guessed.
+Raw-length fields (`grid.gap: "1rem"`) are intentionally not inferred.
+
+Annotated in `data/k6n/schemas`: `layout` (all fields, `$defs/breakpoint`, wrapper), `consulting-band` (`tone`, `align`, `width`),
+and every block with a numeric `columns`.
+
+## What the editor does with it
+
+- **Handles on the page** (`src/style/BoxHandles.tsx`): padding (green), margin (orange) and gap (purple) bands from computed style,
+  each with a grip. Drag → live inline preview → snaps to a token on release → one coalesced `set`. Only sides the schema can express
+  get a grip (`left/right` fall back to the `all` field and say "(all sides)").
+- **Style dialog** (`src/style/StylePanel.tsx`, toolbar ◐): flow / align / justify chips, columns stepper, a margin ⟶ padding box
+  diagram with one select per expressible side (override fields show what they inherit), gap chips with px, tone / border / reveal,
+  breakpoint tabs. Registered with `match: (info) => describeStyle(info.schema).length > 0`: **by schema, not by type**.
+- **Wrap in layout** (toolbar ▣) for blocks without style fields.
+- Pure, tested pieces: `model.ts` (descriptors, effective values, patches), `tokens.ts` (measure/snap), `handles.ts` (geometry, drag maths).
+
+## Open points / suggestions for the CMS side
+
+1. **Responsive spacing** is not possible today: no `gap/padding/margin` classes per breakpoint. If wanted: add `x-style` spacing
+   fields to `$defs/breakpoint` and emit e.g. `k6n-gap-md@t` classes from `layout.gohtml`; the editor picks them up unchanged.
+2. **Left/right padding and margin** have no fields (`paddingTop/Bottom` only), so those grips edit the all-sides field. Adding
+   `paddingX/marginX` (`side: "x"`) gives them their own handles with no editor change.
+3. `InsertOp` in `@k6n/cms-editor` lacks the optional `id` the server accepts (the editor casts for the wrap batch).
+4. A layout linked to a `style-class` inherits `tone`/`border` from it; the panel shows the layout's own value only.
diff --git a/mock/fixtures.ts b/mock/fixtures.ts
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+import { Graph } from './graph'
+import type { MNode } from './graph'
+
+const lifecycle = { lastModified: { type: 'string', readOnly: true }, status: { type: 'string', readOnly: true } }
+
+/** JSON Schemas with the x-graph extension, shaped like GET /api/schemas/{type}. */
+export const schemas: Record<string, any> = {
+  page: {
+    type: 'object',
+    title: 'Page',
+    required: ['title'],
+    properties: { title: { type: 'string' }, path: { type: 'string' }, ...lifecycle },
+    'x-graph': { children: ['section', 'heading', 'text', 'button', 'footer', 'layout'], group: 'Pages', label: 'title' },
+  },
+  // Mirrors the real footer schema, plus a map, an enum set, a oneOf and a $ref - exercises every form widget.
+  footer: {
+    type: 'object',
+    title: 'Footer',
+    'x-graph': { group: 'Layout', label: 'companyName' },
+    required: ['companyName'],
+    'x-groups': { contact: { title: 'Contact', collapsedByDefault: false }, social: { title: 'Social' } },
+    $defs: { link: { type: 'object', title: 'Link', required: ['text'], properties: { text: { type: 'string', minLength: 2 }, href: { type: 'string', format: 'uri' }, external: { type: 'boolean' } }, additionalProperties: false } },
+    properties: {
+      companyName: { type: 'string', default: 'Acme AB' },
+      tagline: { type: 'string' },
+      address: { type: 'string', 'x-editor': 'markdown', description: 'One line per row', 'x-group': 'contact' },
+      email: { type: 'string', format: 'email', 'x-group': 'contact' },
+      links: { type: 'array', description: 'Footer links', minItems: 0, maxItems: 6, items: { $ref: '#/$defs/link' } },
+      usps: { type: 'array', items: { type: 'string' }, description: 'Short selling points' },
+      social: { type: 'object', additionalProperties: { type: 'string', format: 'uri' }, 'x-group': 'social', description: 'network → url' },
+      badges: { type: 'array', uniqueItems: true, items: { type: 'string', enum: ['iso9001', 'gdpr', 'b-corp'] } },
+      cta: {
+        title: 'Call to action',
+        oneOf: [
+          { title: 'Link', type: 'object', required: ['kind', 'href'], properties: { kind: { const: 'link' }, href: { type: 'string' } } },
+          { title: 'Phone', type: 'object', required: ['kind', 'number'], properties: { kind: { const: 'phone' }, number: { type: 'string' } } },
+        ],
+      },
+      internal: { type: 'string', readOnly: true },
+      secret: { type: 'string', 'x-editor': 'hidden' },
+    },
+    additionalProperties: false,
+  },
+  // Mirrors data/k6n/schemas/layout.json (annotated with x-style): token enums, overrides, responsive presets.
+  layout: {
+    type: 'object',
+    title: 'Layout',
+    'x-style': { wrapper: true },
+    'x-graph': { children: ['heading', 'text', 'button', 'section', 'footer', 'layout'], group: 'Layout', label: 'label' },
+    $defs: {
+      breakpoint: {
+        type: 'object',
+        properties: {
+          flow: { 'x-style': { kind: 'flow' }, type: 'string', enum: ['row', 'stack', 'actions'] },
+          columns: { 'x-style': { kind: 'columns' }, type: 'integer', minimum: 1, maximum: 12 },
+        },
+        additionalProperties: false,
+      },
+    },
+    properties: {
+      label: { type: 'string' },
+      flow: { 'x-style': { kind: 'flow' }, type: 'string', enum: ['row', 'stack', 'actions', 'vertical', 'horizontal', 'grid'], default: 'row' },
+      columns: { 'x-style': { kind: 'columns' }, type: 'integer', minimum: 1, maximum: 12, default: 2 },
+      gap: { 'x-style': { kind: 'gap', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'], default: 'md' },
+      padding: { 'x-style': { kind: 'spacing', box: 'padding', side: 'all', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'] },
+      paddingTop: { 'x-style': { kind: 'spacing', box: 'padding', side: 'top', overrides: 'padding', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'] },
+      paddingBottom: { 'x-style': { kind: 'spacing', box: 'padding', side: 'bottom', overrides: 'padding', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'] },
+      margin: { 'x-style': { kind: 'spacing', box: 'margin', side: 'all', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'] },
+      marginTop: { 'x-style': { kind: 'spacing', box: 'margin', side: 'top', overrides: 'margin', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'] },
+      marginBottom: { 'x-style': { kind: 'spacing', box: 'margin', side: 'bottom', overrides: 'margin', token: '--k6n-sp-{value}' }, type: 'string', enum: ['none', 'xs', 'sm', 'md', 'lg', 'xl'] },
+      align: { 'x-style': { kind: 'align' }, type: 'string', enum: ['start', 'center', 'end', 'stretch'] },
+      justify: { 'x-style': { kind: 'justify' }, type: 'string', enum: ['start', 'center', 'end', 'between'] },
+      tone: { 'x-style': { kind: 'tone' }, type: 'string', enum: ['none', 'dark', 'paper', 'light'] },
+      border: { 'x-style': { kind: 'border' }, type: 'string', enum: ['none', 'thin', 'strong'] },
+      responsive: {
+        type: 'object',
+        title: 'Responsive presets',
+        properties: { mobile: { $ref: '#/$defs/breakpoint' }, tablet: { $ref: '#/$defs/breakpoint' }, desktop: { $ref: '#/$defs/breakpoint' } },
+        additionalProperties: false,
+      },
+    },
+    additionalProperties: false,
+  },
+  section: {
+    type: 'object',
+    title: 'Section',
+    properties: {
+      title: { type: 'string', description: 'Shown as the section heading' },
+      tone: { type: 'string', enum: ['light', 'dark', 'accent'], description: 'Background style' },
+      padded: { type: 'boolean' },
+      meta: { type: 'object', properties: { anchor: { type: 'string' }, order: { type: 'integer', minimum: 0 } } },
+    },
+    'x-graph': { children: ['heading', 'text', 'button', 'section', 'layout'], group: 'Layout', label: 'title' },
+  },
+  heading: {
+    type: 'object',
+    title: 'Heading',
+    'x-graph': { group: 'Content', label: 'text' },
+    required: ['text'],
+    properties: { text: { type: 'string' }, level: { type: 'integer', enum: [1, 2, 3] } },
+  },
+  text: {
+    type: 'object',
+    title: 'Text',
+    'x-graph': { group: 'Content' },
+    properties: { body: { type: 'string', format: 'markdown', description: 'Markdown' } },
+  },
+  button: {
+    type: 'object',
+    title: 'Button',
+    'x-graph': { group: 'Content', label: 'label' },
+    required: ['label'],
+    properties: { label: { type: 'string' }, href: { type: 'string' }, tags: { type: 'array', items: { type: 'string' } } },
+  },
+}
+
+/** The real shape: `{ types: [{ type, schema, staticRoot? }] }` - every type's schema comes with the list. */
+export const types = Object.keys(schemas).map((type) => ({ type, schema: schemas[type], ...(type === 'page' ? { staticRoot: true } : {}) }))
+export const blueprints = [{ id: 'hero', name: 'Hero (heading + text + button)', description: 'Not supported by the mock server' }]
+
+export function seedGraph(): Graph {
+  return new Graph({
+    nodes: [
+      { id: 'p1', dataType: 'page', data: { title: 'Mock page', path: '/' } },
+      { id: 's1', dataType: 'section', data: { title: 'Welcome', tone: 'dark', padded: true } },
+      { id: 'h1', dataType: 'heading', data: { text: 'Edit this headline', level: 1 } },
+      { id: 't1', dataType: 'text', data: { body: 'A paragraph with **bold** and *italic* text.\n\n- one\n- two' } },
+      { id: 'b1', dataType: 'button', data: { label: 'Get in touch', href: '#contact' } },
+      { id: 's2', dataType: 'section', data: { title: 'Services', tone: 'light' } },
+      { id: 't2', dataType: 'text', data: { body: 'Second block of copy. Double-click to edit it in place.' } },
+      { id: 'l1', dataType: 'layout', data: { flow: 'row', columns: 2, gap: 'md', padding: 'sm', paddingTop: 'lg', margin: 'sm', label: 'Two columns' } },
+      { id: 'x1', dataType: 'text', data: { body: 'Left column.' } },
+      { id: 'x2', dataType: 'text', data: { body: 'Right column.' } },
+      {
+        id: 'f1',
+        dataType: 'footer',
+        data: { companyName: 'Mock AB', links: [{ text: 'About', href: 'https://example.com/about' }, { text: 'Careers', href: 'https://example.com/jobs', external: true }], usps: ['Fast', 'Friendly'], social: { github: 'https://github.com/example' }, badges: ['gdpr'], cta: { kind: 'link', href: '/contact' } },
+      },
+    ],
+    edges: [
+      { id: 'e1', from: 'p1', to: 's1', sort: 0 },
+      { id: 'e2', from: 's1', to: 'h1', sort: 0 },
+      { id: 'e3', from: 's1', to: 't1', sort: 1 },
+      { id: 'e4', from: 's1', to: 'b1', sort: 2 },
+      { id: 'e5', from: 'p1', to: 's2', sort: 1 },
+      { id: 'e6', from: 's2', to: 't2', sort: 0 },
+      { id: 'e8', from: 'p1', to: 'l1', sort: 2 },
+      { id: 'e9', from: 'l1', to: 'x1', sort: 0 },
+      { id: 'e10', from: 'l1', to: 'x2', sort: 1 },
+      { id: 'e7', from: 'p1', to: 'f1', sort: 3 },
+    ],
+  })
+}
+
+const esc = (s: unknown) => String(s ?? '').replace(/[&<>"]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' })[c]!)
+
+/** A tiny markdown subset (paragraphs, bold, italic, lists) - enough for fixtures. */
+export function md(src: string): string {
+  const inline = (t: string) => esc(t).replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>').replace(/\*(.+?)\*/g, '<em>$1</em>')
+  return src
+    .split(/\n{2,}/)
+    .map((blk) => {
+      const lines = blk.split('\n')
+      if (lines.every((l) => /^[-*] /.test(l))) return `<ul>${lines.map((l) => `<li>${inline(l.slice(2))}</li>`).join('')}</ul>`
+      const h = /^(#{1,3}) (.*)$/.exec(blk)
+      if (h) return `<h${h[1].length}>${inline(h[2])}</h${h[1].length}>`
+      return `<p>${inline(blk)}</p>`
+    })
+    .join('\n')
+}
+
+/** Server-side render of one node + descendants, with the data-cms-* markup contract. */
+export function render(g: Graph, id: string): string {
+  const n: MNode = g.node(id)
+  const kids = () => g.children(id).map((e) => render(g, e.to)).join('\n')
+  const attrs = `data-cms="${n.id}" data-cms-type="${n.dataType}"`
+  switch (n.dataType) {
+    case 'section':
+      return `<section class="sec sec--${esc(n.data.tone ?? 'light')}${n.data.padded ? ' sec--padded' : ''}" ${attrs} data-cms-container="true">${
+        n.data.title ? `<p class="sec__title">${esc(n.data.title)}</p>` : ''
+      }\n${kids()}\n</section>`
+    case 'heading': {
+      const l = n.data.level ?? 2
+      return `<h${l} ${attrs} data-cms-field="text" data-cms-editor="text">${esc(n.data.text)}</h${l}>`
+    }
+    case 'text':
+      return `<div class="prose" ${attrs} data-cms-field="body" data-cms-editor="markdown">${md(n.data.body ?? '')}</div>`
+    case 'layout': {
+      const d = n.data
+      const flow = ({ vertical: 'stack', horizontal: 'row', grid: 'row' } as Record<string, string>)[d.flow] ?? d.flow ?? 'row'
+      const sp = [['padding', 'p'], ['paddingTop', 'pt'], ['paddingBottom', 'pb'], ['margin', 'm'], ['marginTop', 'mt'], ['marginBottom', 'mb']]
+        .filter(([k]) => d[k])
+        .map(([k, c]) => ` k6n-${c}-${d[k]}`)
+        .join('')
+      const r = d.responsive ?? {}
+      const resp = [['mobile', 'm'], ['tablet', 't'], ['desktop', 'd']]
+        .flatMap(([bp, c]) => [r[bp]?.flow ? ` k6n-layout--${c}-${r[bp].flow}` : '', r[bp]?.columns ? ` k6n-layout--${c}c-${r[bp].columns}` : ''])
+        .join('')
+      const tone = d.tone && d.tone !== 'none' ? ` k6n-${d.tone}` : ''
+      const cells = g.children(id).map((e) => `<div class="k6n-layout__cell">${render(g, e.to)}</div>`).join('\n')
+      return `<div class="k6n-layout k6n-layout--${flow} k6n-gap-${d.gap ?? 'md'}${sp}${tone}${resp}" style="--k6n-cols:${d.columns ?? 2}" ${attrs} data-cms-container="true">\n${cells}\n</div>`
+    }
+    case 'footer': {
+      const links = ((n.data.links as any[]) ?? []).map((l) => `<li><a href="${esc(l.href ?? '#')}">${esc(l.text)}</a></li>`).join('')
+      return `<footer class="foot" ${attrs}><strong>${esc(n.data.companyName)}</strong><ul>${links}</ul></footer>`
+    }
+    case 'button':
+      return `<p ${attrs}><a class="btn" href="${esc(n.data.href ?? '#')}" data-cms-field="label" data-cms-editor="text">${esc(n.data.label)}</a></p>`
+    default:
+      return `<div ${attrs}>${kids()}</div>`
+  }
+}
+
+export const pageCss = `
+.k6n-gap-none{gap:var(--k6n-sp-none)}.k6n-gap-xs{gap:var(--k6n-sp-xs)}.k6n-gap-sm{gap:var(--k6n-sp-sm)}.k6n-gap-md{gap:var(--k6n-sp-md)}.k6n-gap-lg{gap:var(--k6n-sp-lg)}.k6n-gap-xl{gap:var(--k6n-sp-xl)}.k6n-p-none{padding:var(--k6n-sp-none)}.k6n-p-xs{padding:var(--k6n-sp-xs)}.k6n-p-sm{padding:var(--k6n-sp-sm)}.k6n-p-md{padding:var(--k6n-sp-md)}.k6n-p-lg{padding:var(--k6n-sp-lg)}.k6n-p-xl{padding:var(--k6n-sp-xl)}.k6n-pt-none{padding-top:var(--k6n-sp-none)}.k6n-pt-xs{padding-top:var(--k6n-sp-xs)}.k6n-pt-sm{padding-top:var(--k6n-sp-sm)}.k6n-pt-md{padding-top:var(--k6n-sp-md)}.k6n-pt-lg{padding-top:var(--k6n-sp-lg)}.k6n-pt-xl{padding-top:var(--k6n-sp-xl)}.k6n-pb-none{padding-bottom:var(--k6n-sp-none)}.k6n-pb-xs{padding-bottom:var(--k6n-sp-xs)}.k6n-pb-sm{padding-bottom:var(--k6n-sp-sm)}.k6n-pb-md{padding-bottom:var(--k6n-sp-md)}.k6n-pb-lg{padding-bottom:var(--k6n-sp-lg)}.k6n-pb-xl{padding-bottom:var(--k6n-sp-xl)}.k6n-m-none{margin:var(--k6n-sp-none)}.k6n-m-xs{margin:var(--k6n-sp-xs)}.k6n-m-sm{margin:var(--k6n-sp-sm)}.k6n-m-md{margin:var(--k6n-sp-md)}.k6n-m-lg{margin:var(--k6n-sp-lg)}.k6n-m-xl{margin:var(--k6n-sp-xl)}.k6n-mt-none{margin-top:var(--k6n-sp-none)}.k6n-mt-xs{margin-top:var(--k6n-sp-xs)}.k6n-mt-sm{margin-top:var(--k6n-sp-sm)}.k6n-mt-md{margin-top:var(--k6n-sp-md)}.k6n-mt-lg{margin-top:var(--k6n-sp-lg)}.k6n-mt-xl{margin-top:var(--k6n-sp-xl)}.k6n-mb-none{margin-bottom:var(--k6n-sp-none)}.k6n-mb-xs{margin-bottom:var(--k6n-sp-xs)}.k6n-mb-sm{margin-bottom:var(--k6n-sp-sm)}.k6n-mb-md{margin-bottom:var(--k6n-sp-md)}.k6n-mb-lg{margin-bottom:var(--k6n-sp-lg)}.k6n-mb-xl{margin-bottom:var(--k6n-sp-xl)}
+:root{color-scheme:light}body{margin:0;font:16px/1.6 Georgia,serif;background:#f6f3ec;color:#1a1a1a}
+main{max-width:760px;margin:0 auto;padding:32px 20px 140px}.sec{padding:24px 28px;margin:16px 0;border-radius:10px}
+.sec--dark{background:#15171d;color:#f1efe8}.sec--light{background:#fff}.sec--accent{background:#d2a24c}.sec--padded{padding:48px 28px}
+.sec__title{margin:0 0 8px;font:600 12px/1 system-ui;letter-spacing:.12em;text-transform:uppercase;opacity:.6}
+h1{font-size:40px;margin:.2em 0}.btn{display:inline-block;background:#d2a24c;color:#111;padding:10px 18px;border-radius:999px;text-decoration:none;font:600 14px system-ui}
+.prose p,.prose ul{margin:.6em 0}
+:root{--k6n-sp-none:0;--k6n-sp-xs:.5rem;--k6n-sp-sm:clamp(.75rem,1.5vw,1.25rem);--k6n-sp-md:clamp(1.5rem,3vw,3rem);--k6n-sp-lg:clamp(2.5rem,5vw,5rem);--k6n-sp-xl:clamp(4rem,8vw,8rem)}
+.k6n-layout{display:grid;grid-template-columns:repeat(var(--k6n-cols,2),minmax(0,1fr));align-items:start}.k6n-layout--stack{grid-template-columns:minmax(0,1fr)}
+.k6n-layout--actions{display:flex;flex-wrap:wrap;align-items:center}.k6n-layout > .k6n-layout__cell{min-width:0}
+.k6n-layout--t-row{grid-template-columns:repeat(var(--k6n-cols,2),minmax(0,1fr))}.k6n-layout--m-stack{grid-template-columns:minmax(0,1fr)}
+.k6n-dark{background:#15171d;color:#f1efe8}.k6n-paper{background:#f6f3ec}.k6n-light{background:#fff}.foot{margin-top:32px;padding:20px;border-top:1px solid #ccc;font:14px system-ui}.foot ul{display:flex;gap:16px;list-style:none;padding:0}
+`
+
+export function renderPage(g: Graph, rootId = 'p1'): string {
+  const body = g.children(rootId).map((e) => render(g, e.to)).join('\n')
+  const title = esc(g.node(rootId).data.title)
+  return `<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><title>${title}</title><style>${pageCss}</style></head><body><main>\n${body}\n</main></body></html>`
+}
diff --git a/mock/graph.test.ts b/mock/graph.test.ts
new file mode 100644
index 0000000..02e3ddb
--- /dev/null
+++ b/mock/graph.test.ts
@@ -0,0 +1,72 @@
+import { describe, expect, it } from 'vitest'
+import { seedGraph } from './fixtures'
+import { HttpError } from './graph'
+
+const kids = (g: ReturnType<typeof seedGraph>, id: string) => g.children(id).map((e) => e.to)
+
+describe('mock graph /api/edit semantics', () => {
+  it('insert at an index, and its inverse removes it again', () => {
+    const g = seedGraph()
+    const r = g.edit([{ op: 'insert', parent: 's1', type: 'text', index: 1, data: { body: 'x' } }])
+    expect(kids(g, 's1')).toEqual(['h1', r.results[0].node, 't1', 'b1'])
+    g.edit(r.inverse)
+    expect(kids(g, 's1')).toEqual(['h1', 't1', 'b1'])
+    expect(g.nodes.has(r.results[0].node!)).toBe(false)
+  })
+
+  it('set merges, null deletes, inverse restores (including absent keys)', () => {
+    const g = seedGraph()
+    const r = g.edit([{ op: 'set', id: 'h1', data: { text: 'New', extra: 1, level: null } }])
+    expect(g.node('h1').data).toEqual({ text: 'New', extra: 1 })
+    g.edit(r.inverse)
+    expect(g.node('h1').data).toEqual({ text: 'Edit this headline', level: 1 })
+  })
+
+  it('rejects a stale version with 409 and lifecycle keys with 400', () => {
+    const g = seedGraph()
+    g.edit([{ op: 'set', id: 'h1', data: { text: 'a' } }])
+    expect(() => g.edit([{ op: 'set', id: 'h1', data: { text: 'b' }, version: 1 }])).toThrow(expect.objectContaining({ status: 409 }))
+    expect(() => g.edit([{ op: 'set', id: 'h1', data: { status: 'x' } }])).toThrow(HttpError)
+  })
+
+  it('move reorders and re-parents; inverse puts it back', () => {
+    const g = seedGraph()
+    const r = g.edit([{ op: 'move', edge: 'e4', parent: 's2', index: 0 }])
+    expect(kids(g, 's2')).toEqual(['b1', 't2'])
+    expect(kids(g, 's1')).toEqual(['h1', 't1'])
+    g.edit(r.inverse)
+    expect(kids(g, 's1')).toEqual(['h1', 't1', 'b1'])
+    expect(kids(g, 's2')).toEqual(['t2'])
+  })
+
+  it('refuses cycles', () => {
+    const g = seedGraph()
+    g.edit([{ op: 'insert', parent: 's1', type: 'section', id: 'inner' }])
+    expect(() => g.edit([{ op: 'move', edge: 'e1', parent: 'inner' }])).toThrow(/cycle/)
+  })
+
+  it('delete takes the subtree; the inverse (restore) brings it back verbatim', () => {
+    const g = seedGraph()
+    const r = g.edit([{ op: 'delete', edge: 'e1' }])
+    expect(g.nodes.has('s1')).toBe(false)
+    expect(g.nodes.has('h1')).toBe(false)
+    g.edit(r.inverse)
+    expect(kids(g, 'p1')).toEqual(['s1', 's2', 'l1', 'f1'])
+    expect(kids(g, 's1')).toEqual(['h1', 't1', 'b1'])
+  })
+
+  it('duplicate deep-copies right after the original', () => {
+    const g = seedGraph()
+    const r = g.edit([{ op: 'duplicate', edge: 'e1' }])
+    const copy = r.results[0].node!
+    expect(kids(g, 'p1')).toEqual(['s1', copy, 's2', 'l1', 'f1'])
+    expect(kids(g, copy)).toHaveLength(3)
+  })
+
+  it('a failing op rolls the whole batch back and names the index', () => {
+    const g = seedGraph()
+    const before = JSON.stringify([...g.nodes])
+    expect(() => g.edit([{ op: 'set', id: 'h1', data: { text: 'changed' } }, { op: 'delete', edge: 'nope' }])).toThrow(/op 1/)
+    expect(JSON.stringify([...g.nodes])).toBe(before)
+  })
+})
diff --git a/mock/graph.ts b/mock/graph.ts
new file mode 100644
index 0000000..7d956fb
--- /dev/null
+++ b/mock/graph.ts
@@ -0,0 +1,196 @@
+// An in-memory stand-in for the CMS: just enough of /api/edit, /api/nodes and
+// /api/schemas to develop and test the editor with no server and no login.
+// Semantics follow docs/onpage-editor.md (atomic batches, inverse ops, 409 on a
+// stale version, patches = re-rendered subtrees). It is deliberately small - when
+// real behaviour differs, fix the mock, then the editor.
+export interface MNode { id: string; dataType: string; data: Record<string, any>; version: number; tags: string[] }
+export interface MEdge { id: string; from: string; to: string; type: string; handle?: string; sort: number }
+
+export class HttpError extends Error {
+  constructor(readonly status: number, message: string) {
+    super(message)
+  }
+}
+
+type Op = Record<string, any>
+
+export class Graph {
+  nodes = new Map<string, MNode>()
+  edges = new Map<string, MEdge>()
+  private seq = 100
+
+  constructor(seed?: { nodes: Omit<MNode, 'version' | 'tags'>[]; edges: Omit<MEdge, 'type'>[] }) {
+    if (seed) {
+      for (const n of seed.nodes) this.nodes.set(n.id, { version: 1, tags: [], ...n })
+      for (const e of seed.edges) this.edges.set(e.id, { type: 'child', ...e })
+    }
+  }
+
+  private id(p: string) {
+    return `${p}${++this.seq}`
+  }
+  node(id: string): MNode {
+    const n = this.nodes.get(id)
+    if (!n) throw new HttpError(404, `node ${id} not found`)
+    return n
+  }
+  edge(id: string): MEdge {
+    const e = this.edges.get(id)
+    if (!e) throw new HttpError(404, `edge ${id} not found`)
+    return e
+  }
+  children(id: string): MEdge[] {
+    return [...this.edges.values()].filter((e) => e.from === id && e.type === 'child').sort((a, b) => a.sort - b.sort)
+  }
+  parents(id: string): MEdge[] {
+    return [...this.edges.values()].filter((e) => e.to === id)
+  }
+  edgesOf(id: string) {
+    return { from: this.children(id), into: this.parents(id) }
+  }
+
+  private renumber(parent: string) {
+    this.children(parent).forEach((e, i) => (e.sort = i))
+  }
+  /** Place edge `e` at `index` among its parent's children. */
+  private place(e: MEdge, index?: number) {
+    const sibs = this.children(e.from).filter((x) => x.id !== e.id)
+    const at = index === undefined || index > sibs.length ? sibs.length : Math.max(0, index)
+    sibs.splice(at, 0, e)
+    sibs.forEach((x, i) => (x.sort = i))
+  }
+  private subtree(edgeId: string): { nodes: MNode[]; edges: MEdge[] } {
+    const root = this.edge(edgeId)
+    const nodes: MNode[] = []
+    const edges: MEdge[] = [root]
+    const walk = (id: string) => {
+      nodes.push(this.node(id))
+      for (const c of this.children(id)) {
+        edges.push(c)
+        walk(c.to)
+      }
+    }
+    walk(root.to)
+    return { nodes, edges }
+  }
+
+  /** Apply a batch atomically. Returns results, inverse (already reversed) and touched ids. */
+  edit(ops: Op[]) {
+    if (!Array.isArray(ops) || ops.length < 1 || ops.length > 200) throw new HttpError(400, 'ops must hold 1-200 operations')
+    const snapshot = structuredClone({ nodes: [...this.nodes], edges: [...this.edges], seq: this.seq })
+    const results: Array<{ node?: string; edge?: string }> = []
+    const inverse: Op[] = []
+    const touched = new Set<string>()
+    try {
+      ops.forEach((op, i) => {
+        try {
+          const { result, inv, touch } = this.applyOne(op)
+          results.push(result)
+          inverse.unshift(...inv)
+          touch.forEach((t) => touched.add(t))
+        } catch (e) {
+          if (e instanceof HttpError) throw new HttpError(e.status, `op ${i} (${op.op}): ${e.message}`)
+          throw e
+        }
+      })
+    } catch (e) {
+      this.nodes = new Map(snapshot.nodes)
+      this.edges = new Map(snapshot.edges)
+      this.seq = snapshot.seq
+      throw e
+    }
+    return { results, inverse, touched: [...touched] }
+  }
+
+  private applyOne(op: Op): { result: { node?: string; edge?: string }; inv: Op[]; touch: string[] } {
+    switch (op.op) {
+      case 'insert': {
+        this.node(op.parent)
+        if (!op.type) throw new HttpError(400, 'type required')
+        const node: MNode = { id: op.id ?? this.id('n'), dataType: op.type, data: { ...(op.data ?? {}) }, version: 1, tags: [] }
+        this.nodes.set(node.id, node)
+        const edge: MEdge = { id: this.id('e'), from: op.parent, to: node.id, type: 'child', handle: op.handle, sort: 0 }
+        this.edges.set(edge.id, edge)
+        this.place(edge, op.index)
+        return { result: { node: node.id, edge: edge.id }, inv: [{ op: 'delete', edge: edge.id }], touch: [op.parent] }
+      }
+      case 'set': {
+        const n = this.node(op.id)
+        if (op.version !== undefined && op.version !== n.version) throw new HttpError(409, `stale version (have ${n.version}, got ${op.version})`)
+        const undo: Record<string, unknown> = {}
+        for (const [k, v] of Object.entries<any>(op.data ?? {})) {
+          if (['lastModified', 'status'].includes(k)) throw new HttpError(400, `lifecycle key ${k} cannot be set`)
+          undo[k] = k in n.data ? n.data[k] : null
+          if (v === null) delete n.data[k]
+          else n.data[k] = v
+        }
+        n.version++
+        return { result: { node: n.id }, inv: [{ op: 'set', id: n.id, data: undo }], touch: [n.id] }
+      }
+      case 'move': {
+        const e = this.edge(op.edge)
+        const before = { parent: e.from, handle: e.handle, index: this.children(e.from).findIndex((x) => x.id === e.id) }
+        const to = op.parent ?? e.from
+        if (this.isDescendant(to, e.to)) throw new HttpError(400, 'move would create a cycle')
+        const oldParent = e.from
+        e.from = to
+        if ('handle' in op) e.handle = op.handle
+        this.renumber(oldParent)
+        this.place(e, op.index)
+        return {
+          result: { edge: e.id },
+          inv: [{ op: 'move', edge: e.id, parent: before.parent, handle: before.handle, index: before.index }],
+          touch: [...new Set([oldParent, to])],
+        }
+      }
+      case 'delete': {
+        const e = this.edge(op.edge)
+        const snap = this.subtree(e.id)
+        for (const x of snap.edges) this.edges.delete(x.id)
+        // Subtree nodes survive only if still composed elsewhere (shared blocks).
+        for (const n of snap.nodes) if (this.parents(n.id).length === 0) this.nodes.delete(n.id)
+        this.renumber(e.from)
+        return { result: {}, inv: [{ op: 'restore', edge: e.id, nodes: structuredClone(snap.nodes), edges: structuredClone(snap.edges) }], touch: [e.from] }
+      }
+      case 'restore': {
+        for (const n of op.nodes ?? []) this.nodes.set(n.id, structuredClone(n))
+        for (const e of op.edges ?? []) this.edges.set(e.id, structuredClone(e))
+        const root = this.edge(op.edge)
+        this.place(root, root.sort)
+        return { result: { edge: root.id, node: root.to }, inv: [{ op: 'delete', edge: root.id }], touch: [root.from] }
+      }
+      case 'duplicate': {
+        const e = this.edge(op.edge)
+        const map = new Map<string, string>()
+        const clone = (id: string): string => {
+          const src = this.node(id)
+          const copy: MNode = { ...structuredClone(src), id: this.id('n'), version: 1 }
+          this.nodes.set(copy.id, copy)
+          map.set(id, copy.id)
+          for (const c of this.children(id)) {
+            const ce: MEdge = { ...c, id: this.id('e'), from: copy.id, to: clone(c.to) }
+            this.edges.set(ce.id, ce)
+          }
+          return copy.id
+        }
+        const nid = clone(e.to)
+        const ne: MEdge = { ...e, id: this.id('e'), to: nid }
+        this.edges.set(ne.id, ne)
+        this.place(ne, e.sort + 1)
+        return { result: { node: nid, edge: ne.id }, inv: [{ op: 'delete', edge: ne.id }], touch: [e.from] }
+      }
+      default:
+        throw new HttpError(400, `op "${op.op}" is not implemented by the mock`)
+    }
+  }
+
+  private isDescendant(id: string, ancestor: string): boolean {
+    if (id === ancestor) return true
+    return this.children(ancestor).some((c) => this.isDescendant(id, c.to))
+  }
+
+  /** Root = a node nobody composes. */
+  roots(): MNode[] {
+    return [...this.nodes.values()].filter((n) => this.parents(n.id).length === 0)
+  }
+}
diff --git a/mock/server.ts b/mock/server.ts
new file mode 100644
index 0000000..f1aa589
--- /dev/null
+++ b/mock/server.ts
@@ -0,0 +1,140 @@
+// Framework-neutral request handler for the mock CMS, used by the Vite plugin
+// (dev:mock) and directly by tests (as an injectable `fetch`).
+import { Graph, HttpError } from './graph'
+import { blueprints, render, renderPage, schemas, seedGraph, types } from './fixtures'
+
+export interface MockOptions {
+  /** Require this bearer token (to test the 401 path). Default: open. */
+  token?: string
+  /** Require sign-in through the mock device flow (GET/POST /api/auth/device*). Default: open. */
+  auth?: boolean
+  /** Auto-approve a device grant this long after it starts (dev:mock). Tests call approve(). */
+  approveAfterMs?: number
+}
+
+export function createMockCms(opts: MockOptions = {}) {
+  let graph = seedGraph()
+  const published: string[] = []
+  const requests: string[] = []
+  let previewApi = true
+  // --- mock go-auth (RFC 8628 device grant) ---
+  const access = new Set<string>()
+  let refreshTok: string | null = null
+  let approved = false
+  let n = 0
+  const issue = () => {
+    const a = `mock-access-${++n}`
+    access.add(a)
+    refreshTok = `mock-refresh-${n}`
+    return { access_token: a, token_type: 'Bearer', expires_in: 900, refresh_token: refreshTok }
+  }
+  const needsAuth = () => !!(opts.token || opts.auth)
+  const authorised = (req: Request) => {
+    const h = req.headers.get('authorization')
+    return !!h && (h === `Bearer ${opts.token}` || access.has(h.replace(/^Bearer /, '')))
+  }
+
+  const json = (status: number, body: unknown) =>
+    new Response(JSON.stringify(body), { status, headers: { 'content-type': 'application/json', 'x-cms-mock': '1' } })
+
+  async function handle(req: Request): Promise<Response> {
+    const url = new URL(req.url, 'http://mock')
+    const path = url.pathname
+    const m = req.method
+    requests.push(`${m} ${path}${url.search}`)
+    try {
+      // The mock is its own issuer (same origin), so the browser can complete the flow with no network.
+      if (path === '/device') {
+        return new Response(
+          `<!doctype html><meta charset="utf-8"><title>Mock approval</title><body style="font:16px system-ui;max-width:420px;margin:15vh auto;text-align:center"><h1>Approve sign-in?</h1><p>Code <b>MOCK-1234</b></p><button style="font:inherit;padding:10px 24px" onclick="fetch('/__mock/approve',{method:'POST'}).then(()=>{document.body.innerHTML='<h1>Approved</h1><p>You can close this tab.</p>';setTimeout(close,800)})">Approve</button>`,
+          { headers: { 'content-type': 'text/html; charset=utf-8' } },
+        )
+      }
+      if (path === '/__mock/approve' && m === 'POST') {
+        approved = true
+        return new Response(null, { status: 204 })
+      }
+      if (path === '/api/auth/config') return json(200, needsAuth() ? { mode: 'oidc', issuer: url.origin, clientId: 'mock' } : { mode: 'none' })
+      if (path === '/api/auth/device' && m === 'POST') {
+        approved = false
+        if (opts.approveAfterMs !== undefined) setTimeout(() => (approved = true), opts.approveAfterMs)
+        return json(200, { device_code: 'mock-device', user_code: 'MOCK-1234', verification_uri: `${url.origin}/device`, verification_uri_complete: `${url.origin}/device?user_code=MOCK-1234`, expires_in: 600, interval: 1 })
+      }
+      if (path === '/api/auth/device/token' && m === 'POST') return approved ? json(200, issue()) : json(400, { error: 'authorization_pending' })
+      if (path === '/api/auth/device/refresh' && m === 'POST') {
+        const b = (await req.json()) as { refresh_token?: string }
+        return b.refresh_token && b.refresh_token === refreshTok ? json(200, issue()) : json(400, { error: 'invalid_grant' })
+      }
+      if (needsAuth() && path.startsWith('/api/') && !authorised(req)) return json(401, { error: 'unauthorized: auth: no credentials' })
+      if (path === '/api/auth/me') return json(200, { sub: 'mock-user', scopes: ['admin'] })
+      if (path === '/api/types') return json(200, { types, locales: [] })
+      if (path === '/api/blueprints') return json(200, blueprints)
+      let r: RegExpExecArray | null
+      if ((r = /^\/api\/schemas\/([^/]+)$/.exec(path))) {
+        const s = schemas[decodeURIComponent(r[1])]
+        return s ? json(200, s) : json(404, { error: 'unknown type' })
+      }
+      if ((r = /^\/api\/nodes\/([^/]+)\/edges$/.exec(path))) {
+        graph.node(r[1])
+        return json(200, graph.edgesOf(r[1]))
+      }
+      if ((r = /^\/api\/nodes\/([^/]+)$/.exec(path)) && m === 'GET') {
+        const n = graph.node(r[1])
+        return json(200, { id: n.id, dataType: n.dataType, data: n.data, tags: n.tags, version: n.version })
+      }
+      if ((r = /^\/api\/tree\/([^/]+)$/.exec(path)) && m === 'GET') {
+        // TreeNode { node, edge, children[] } - one request for the whole page's data
+        const walk = (id: string, edge?: unknown): unknown => {
+          const n = graph.node(id)
+          return { node: { id: n.id, dataType: n.dataType, data: n.data, tags: n.tags, version: n.version }, edge, children: graph.children(id).map((e) => walk(e.to, e)) }
+        }
+        return json(200, walk(r[1]))
+      }
+      if (path === '/api/edit' && m === 'POST') {
+        const body = (await req.json()) as { ops: any[] }
+        const res = graph.edit(body.ops)
+        const patches = res.touched.map((id) => {
+          if (graph.parents(id).length === 0) return { id, error: 'root cannot render standalone' } // like a real page node
+          return { id, html: render(graph, id) }
+        })
+        return json(200, { ...res, patches })
+      }
+      if (path === '/api/publish-roots' && m === 'POST') {
+        const body = (await req.json()) as { roots: string[] }
+        published.push(...body.roots)
+        return json(200, { published: body.roots })
+      }
+      if (path === '/api/preview' && !previewApi) return json(404, { error: 'no such route' })
+      if (path === '/api/preview' || (m === 'GET' && req.headers.get('accept')?.includes('text/html'))) {
+        return new Response(renderPage(graph), { headers: { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-store', 'x-cms-page': '1' } })
+      }
+      return json(404, { error: `mock: no route for ${m} ${path}` })
+    } catch (e) {
+      if (e instanceof HttpError) return json(e.status, { error: e.message })
+      return json(500, { error: (e as Error).message })
+    }
+  }
+
+  return {
+    handle,
+    /** Back to the seed data (also exposed at POST /__mock/reset in dev). */
+    reset: () => void (graph = seedGraph()),
+    /** Approve the pending device grant (what the user does on the issuer's /device page). */
+    approve: () => void (approved = true),
+    /** Simulate access-token expiry: every issued access token starts returning 401. */
+    expireAccess: () => access.clear(),
+    /** Simulate revocation: the refresh token stops working too. */
+    revoke: () => {
+      access.clear()
+      refreshTok = null
+    },
+    get graph() {
+      return graph
+    },
+    published,
+    requests,
+    /** Simulate a CMS without GET /api/preview (the editor must fall back to the page URL). */
+    disablePreviewApi: () => void (previewApi = false),
+    fetch: ((input: RequestInfo | URL, init?: RequestInit) => handle(new Request(new URL(String(input), 'http://mock'), { ...init, signal: undefined }))) as typeof fetch,
+  }
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..642ef7f
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,3617 @@
+{
+  "name": "cms-onpageeditor",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "cms-onpageeditor",
+      "version": "0.1.0",
+      "dependencies": {
+        "@mdi/js": "^7.4.47",
+        "@tiptap/core": "^3.27.1",
+        "@tiptap/extension-image": "^3.27.1",
+        "@tiptap/markdown": "^3.27.1",
+        "@tiptap/pm": "^3.27.1",
+        "@tiptap/starter-kit": "^3.27.1",
+        "marked": "^17.0.1",
+        "react": "^19.2.0",
+        "react-dom": "^19.2.0"
+      },
+      "devDependencies": {
+        "@testing-library/react": "^16.3.0",
+        "@types/node": "^22.0.0",
+        "@types/react": "^19.2.0",
+        "@types/react-dom": "^19.2.0",
+        "@vitejs/plugin-react": "^5.0.0",
+        "jsdom": "^26.0.0",
+        "typescript": "^5.9.0",
+        "vite": "^7.0.0",
+        "vitest": "^3.2.0"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-3.2.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^2.1.3",
+        "@csstools/css-color-parser": "^3.0.9",
+        "@csstools/css-parser-algorithms": "^3.0.4",
+        "@csstools/css-tokenizer": "^3.0.3",
+        "lru-cache": "^10.4.3"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color/node_modules/lru-cache": {
+      "version": "10.4.3",
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+      "license": "ISC"
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+        "type": "opencollective",
+        "url": "https://opencollective.com/babel"
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+      "dev": true,
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+      "license": "Apache-2.0",
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+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
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+      "dev": true,
+      "license": "ISC"
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..d4bdbd2
--- /dev/null
+++ b/package.json
@@ -0,0 +1,38 @@
+{
+  "name": "cms-onpageeditor",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "Injectable on-page editor for the go-graph-cms: side-loaded onto the statically rendered page, edits through POST /api/edit.",
+  "scripts": {
+    "dev": "vite",
+    "dev:mock": "CMS_MODE=mock vite",
+    "build": "tsc --noEmit && vite build --mode lib",
+    "preview": "vite preview",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "dependencies": {
+    "@mdi/js": "^7.4.47",
+    "@tiptap/core": "^3.27.1",
+    "@tiptap/extension-image": "^3.27.1",
+    "@tiptap/markdown": "^3.27.1",
+    "@tiptap/pm": "^3.27.1",
+    "@tiptap/starter-kit": "^3.27.1",
+    "marked": "^17.0.1",
+    "react": "^19.2.0",
+    "react-dom": "^19.2.0"
+  },
+  "devDependencies": {
+    "@testing-library/react": "^16.3.0",
+    "@types/node": "^22.0.0",
+    "@types/react": "^19.2.0",
+    "@types/react-dom": "^19.2.0",
+    "@vitejs/plugin-react": "^5.0.0",
+    "jsdom": "^26.0.0",
+    "typescript": "^5.9.0",
+    "vite": "^7.0.0",
+    "vitest": "^3.2.0"
+  }
+}
diff --git a/src/api.ts b/src/api.ts
new file mode 100644
index 0000000..7fec699
--- /dev/null
+++ b/src/api.ts
@@ -0,0 +1,160 @@
+// Thin client for the CMS HTTP API (docs/onpage-editor.md §3-4). Same origin as
+// the page, so cookies flow; a bearer token from the backoffice login is added
+// when present. Every call is recorded so the dev panel can show it.
+import type { EditResult, Op } from '@k6n/cms-editor'
+import { AuthManager } from './auth'
+
+export interface CmsNode {
+  id: string
+  dataType: string
+  data: Record<string, any>
+  tags?: string[]
+  version?: number
+}
+export interface CmsEdge {
+  id: string
+  from: string
+  to: string
+  type?: string
+  handle?: string
+  sort: number
+}
+export interface NodeEdges {
+  from: CmsEdge[]
+  into: CmsEdge[]
+}
+export interface TypeInfo {
+  type: string
+  [k: string]: unknown
+}
+export interface Blueprint {
+  id: string
+  name?: string
+  description?: string
+  [k: string]: unknown
+}
+export type JSONSchema = Record<string, any>
+
+export interface RequestLog {
+  n: number
+  method: string
+  url: string
+  status: number
+  ms: number
+  request?: unknown
+  response?: unknown
+}
+
+export class ApiError extends Error {
+  constructor(message: string, readonly status: number) {
+    super(message)
+    this.name = 'ApiError'
+  }
+}
+
+export interface ApiOptions {
+  base?: string
+  fetch?: typeof fetch
+  /** Auth: tokens, refresh and the sign-in flow. Default: a fresh AuthManager. */
+  auth?: AuthManager
+  onLog?: (e: RequestLog) => void
+}
+
+export class Api {
+  private n = 0
+  private schemas = new Map<string, Promise<JSONSchema>>()
+  private typesP?: Promise<TypeInfo[]>
+  private blueprintsP?: Promise<Blueprint[]>
+  readonly doFetch: typeof fetch
+  readonly auth: AuthManager
+
+  constructor(readonly opts: ApiOptions = {}) {
+    this.auth = opts.auth ?? new AuthManager({ fetch: opts.fetch })
+    const raw = opts.fetch ?? ((...a: Parameters<typeof fetch>) => fetch(...a))
+    // Every request: fresh token in, one transparent refresh+retry on 401, sign-out if that fails too.
+    this.doFetch = async (input, init) => {
+      await this.auth.ensureFresh()
+      const send = () => raw(input, { credentials: 'same-origin', ...init, headers: { ...(init?.headers as Record<string, string>), ...this.auth.headers() } })
+      let resp = await send()
+      if (resp.status === 401 && (await this.auth.refresh())) resp = await send()
+      if (resp.status === 401) this.auth.markSignedOut()
+      return resp
+    }
+  }
+
+  headers(): HeadersInit {
+    return this.auth.headers()
+  }
+
+  async request<T>(method: string, path: string, body?: unknown): Promise<T> {
+    const t0 = performance.now()
+    const url = `${this.opts.base ?? ''}${path}`
+    let status = 0
+    let json: unknown
+    try {
+      const resp = await this.doFetch(url, {
+        method,
+        headers: { Accept: 'application/json', ...(body !== undefined ? { 'Content-Type': 'application/json' } : {}) },
+        body: body !== undefined ? JSON.stringify(body) : undefined,
+      })
+      status = resp.status
+      const text = await resp.text()
+      try {
+        json = text ? JSON.parse(text) : undefined
+      } catch {
+        json = text
+      }
+      if (!resp.ok) throw new ApiError((json as any)?.error ?? resp.statusText ?? `HTTP ${status}`, status)
+      return json as T
+    } finally {
+      this.opts.onLog?.({ n: ++this.n, method, url, status, ms: Math.round(performance.now() - t0), request: body, response: json })
+    }
+  }
+
+  /** A fetch that records into the request log (handed to EditClient so /api/edit shows up too). */
+  loggedFetch: typeof fetch = async (input, init) => {
+    const t0 = performance.now()
+    const resp = await this.doFetch(input, init)
+    let request: unknown
+    try {
+      request = init?.body ? JSON.parse(String(init.body)) : undefined
+    } catch {
+      /* not JSON */
+    }
+    const text = await resp.clone().text().catch(() => '')
+    let response: unknown = text
+    try {
+      response = JSON.parse(text)
+    } catch {
+      /* keep text */
+    }
+    this.opts.onLog?.({ n: ++this.n, method: init?.method ?? 'GET', url: String(input), status: resp.status, ms: Math.round(performance.now() - t0), request, response })
+    return resp
+  }
+
+  get = <T>(path: string) => this.request<T>('GET', path)
+  post = <T>(path: string, body?: unknown) => this.request<T>('POST', path, body)
+
+  me = () => this.get<{ [k: string]: unknown }>('/api/auth/me')
+  node = (id: string) => this.get<CmsNode>(`/api/nodes/${encodeURIComponent(id)}`)
+  edges = (id: string) => this.get<NodeEdges>(`/api/nodes/${encodeURIComponent(id)}/edges`)
+  edit = (ops: Op[]) => this.post<EditResult>('/api/edit', { ops })
+  publish = (roots: string[]) => this.post('/api/publish-roots', { roots })
+
+  /** Schemas are code: cache for the session. */
+  schema(type: string): Promise<JSONSchema> {
+    let p = this.schemas.get(type)
+    if (!p) {
+      p = this.get<JSONSchema>(`/api/schemas/${encodeURIComponent(type)}`)
+      p.catch(() => this.schemas.delete(type))
+      this.schemas.set(type, p)
+    }
+    return p
+  }
+  types(): Promise<TypeInfo[]> {
+    return (this.typesP ??= this.get<TypeInfo[] | { types: TypeInfo[] }>('/api/types').then((r) => (Array.isArray(r) ? r : r.types ?? [])))
+  }
+  blueprints(): Promise<Blueprint[]> {
+    return (this.blueprintsP ??= this.get<Blueprint[]>('/api/blueprints').catch(() => []))
+  }
+}
diff --git a/src/auth.ts b/src/auth.ts
new file mode 100644
index 0000000..43f2d86
--- /dev/null
+++ b/src/auth.ts
@@ -0,0 +1,313 @@
+// Sign-in for the editor via go-auth's RFC 8628 device grant (see go-auth
+// /dev-auth.md): start a grant, the user approves it on the issuer's /device
+// page, we poll, then hold a short-lived access token and renew it with the
+// rotating refresh token. The issuer allows CORS from the site and localhost:5173,
+// so this runs straight from the page - no proxy.
+//
+// Token sources, in order: `window.__CMS_EDITOR_CONFIG__` (token/apiKey), tokens
+// this manager obtained, the backoffice's own `auth.tokens` (same origin), else
+// cookies only. Refresh tokens live in localStorage in dev, and only in
+// sessionStorage in production (go-auth's guidance: never persist them there).
+import { createStore } from './store'
+import type { Store } from './store'
+
+export interface Tokens {
+  accessToken: string
+  refreshToken?: string
+  /** epoch ms */
+  expiresAt: number
+}
+
+export type AuthStatus = 'unknown' | 'signed-out' | 'pending' | 'signed-in'
+export interface AuthState {
+  status: AuthStatus
+  /** Display name of the signed-in principal. */
+  user?: string
+  userCode?: string
+  verifyUrl?: string
+  error?: string
+}
+
+export interface AuthOptions {
+  fetch?: typeof fetch
+  /** Where the issuer lives. Default: `issuer` from GET /api/auth/config. */
+  issuer?: () => Promise<string>
+  /**
+   * OAuth client to run the device grant as. Default: `clientId` from GET /api/auth/config - the
+   * backoffice's own client, so the token's `aud` is what the CMS API (OIDC_AUDIENCE) accepts.
+   * go-auth's clientless fallback client yields a token the CMS rejects with "wrong audience".
+   */
+  clientId?: () => Promise<string | undefined>
+  /** Extra audience(s) to request (RFC 8707 `resource`), if the CMS audience differs from the client id. */
+  audience?: string[]
+  /** Survives reloads (dev). */
+  persistent?: Storage | null
+  /** Per tab. */
+  session?: Storage | null
+  /** Keep the refresh token in `persistent` (dev) instead of `session` (production). */
+  persistRefresh?: boolean
+  sleep?: (ms: number) => Promise<void>
+  now?: () => number
+  /** Called whenever the access token changes (dev uses it to tell the dev server). */
+  onTokens?: (t: Tokens | null) => void
+  scope?: string
+}
+
+const KEY = 'cms-editor.auth'
+const DEVICE_GRANT = 'urn:ietf:params:oauth:grant-type:device_code'
+const SKEW = 30_000
+
+const safe = (s?: () => Storage | null): Storage | null => {
+  try {
+    return s?.() ?? null
+  } catch {
+    return null
+  }
+}
+
+export class AuthManager {
+  readonly state: Store<AuthState> = createStore<AuthState>({ status: 'unknown' })
+  private tokens: Tokens | null = null
+  private refreshing: Promise<boolean> | null = null
+  private abort: AbortController | null = null
+  private issuerP?: Promise<string>
+  private configP?: Promise<{ issuer?: string; clientId?: string }>
+  private readonly doFetch: typeof fetch
+  private readonly sleep: (ms: number) => Promise<void>
+  private readonly now: () => number
+  private readonly persistent: Storage | null
+  private readonly session: Storage | null
+
+  constructor(private readonly opts: AuthOptions = {}) {
+    this.doFetch = opts.fetch ?? ((...a) => fetch(...a))
+    this.sleep = opts.sleep ?? ((ms) => new Promise((r) => setTimeout(r, ms)))
+    this.now = opts.now ?? Date.now
+    this.persistent = opts.persistent === undefined ? safe(() => localStorage) : opts.persistent
+    this.session = opts.session === undefined ? safe(() => sessionStorage) : opts.session
+    this.tokens = this.load()
+  }
+
+  // --- storage -----------------------------------------------------------------
+
+  private load(): Tokens | null {
+    try {
+      const raw = this.session?.getItem(KEY) ?? this.persistent?.getItem(KEY)
+      return raw ? (JSON.parse(raw) as Tokens) : null
+    } catch {
+      return null
+    }
+  }
+  private save(t: Tokens | null) {
+    this.tokens = t
+    for (const s of [this.session, this.persistent]) {
+      try {
+        if (!t) s?.removeItem(KEY)
+        else if (s === this.session) s?.setItem(KEY, JSON.stringify({ ...t, refreshToken: this.opts.persistRefresh ? undefined : t.refreshToken }))
+        else if (this.opts.persistRefresh) s?.setItem(KEY, JSON.stringify(t))
+      } catch {
+        /* storage full / blocked: stay in memory */
+      }
+    }
+    this.opts.onTokens?.(t)
+  }
+
+  /** Re-send the current tokens to `onTokens` (dev: tell a freshly started dev server). */
+  announce() {
+    if (this.tokens) this.opts.onTokens?.(this.tokens)
+  }
+
+  // --- using the token ----------------------------------------------------------
+
+  /** The token to send right now (does not refresh). */
+  private current(): { kind: 'bearer' | 'key'; value: string } | null {
+    const cfg = (globalThis as any).__CMS_EDITOR_CONFIG__ as { token?: string; apiKey?: string } | undefined
+    if (cfg?.apiKey) return { kind: 'key', value: cfg.apiKey }
+    if (cfg?.token) return { kind: 'bearer', value: cfg.token }
+    if (this.tokens) return { kind: 'bearer', value: this.tokens.accessToken }
+    try {
+      const t = JSON.parse(this.persistent?.getItem('auth.tokens') ?? 'null') as { accessToken?: string; expiresAt?: number } | null
+      if (t?.accessToken && (!t.expiresAt || t.expiresAt > this.now())) return { kind: 'bearer', value: t.accessToken }
+    } catch {
+      /* ignore */
+    }
+    return null
+  }
+
+  headers(): Record<string, string> {
+    const c = this.current()
+    return !c ? {} : c.kind === 'key' ? { 'X-API-Key': c.value } : { Authorization: `Bearer ${c.value}` }
+  }
+
+  /** Refresh first when the access token is (nearly) expired. */
+  async ensureFresh(): Promise<void> {
+    if (this.tokens && this.tokens.refreshToken && this.tokens.expiresAt - SKEW < this.now()) await this.refresh()
+  }
+
+  /** Exchange the refresh token. Concurrent callers share one request (refresh tokens rotate). */
+  refresh(): Promise<boolean> {
+    if (!this.tokens?.refreshToken) return Promise.resolve(false)
+    return (this.refreshing ??= this.doRefresh().finally(() => (this.refreshing = null)))
+  }
+  private async doRefresh(): Promise<boolean> {
+    try {
+      const resp = await this.doFetch(`${await this.issuer()}/api/auth/device/refresh`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ refresh_token: this.tokens!.refreshToken }),
+      })
+      if (!resp.ok) throw new Error(`refresh ${resp.status}`)
+      this.save(this.fromResponse(await resp.json(), this.tokens))
+      return true
+    } catch {
+      this.save(null) // revoked / expired: sign in again
+      return false
+    }
+  }
+
+  private fromResponse(b: any, prev?: Tokens | null): Tokens {
+    return {
+      accessToken: String(b.access_token),
+      refreshToken: b.refresh_token ? String(b.refresh_token) : prev?.refreshToken,
+      expiresAt: this.now() + (Number(b.expires_in) || 900) * 1000,
+    }
+  }
+
+  private config(): Promise<{ issuer?: string; clientId?: string }> {
+    return (this.configP ??= this.doFetch('/api/auth/config').then((r) => r.json()).catch((e) => {
+      this.configP = undefined
+      throw e
+    }))
+  }
+  private issuer(): Promise<string> {
+    const cfg = (globalThis as any).__CMS_EDITOR_CONFIG__ as { issuer?: string } | undefined
+    if (cfg?.issuer) return Promise.resolve(cfg.issuer.replace(/\/$/, ''))
+    return (this.issuerP ??= (this.opts.issuer
+      ? this.opts.issuer()
+      : this.config().then((c) => {
+          if (!c.issuer) throw new Error('this CMS has no OIDC issuer configured')
+          return c.issuer
+        })
+    ).then((i) => i.replace(/\/$/, '')))
+  }
+  private async clientId(): Promise<string | undefined> {
+    const cfg = (globalThis as any).__CMS_EDITOR_CONFIG__ as { clientId?: string } | undefined
+    if (cfg?.clientId) return cfg.clientId
+    if (this.opts.clientId) return this.opts.clientId()
+    return (await this.config().catch(() => ({}) as { clientId?: string })).clientId
+  }
+  private audiences(): string[] {
+    const cfg = (globalThis as any).__CMS_EDITOR_CONFIG__ as { audience?: string | string[] } | undefined
+    return [cfg?.audience ?? this.opts.audience ?? []].flat()
+  }
+
+  // --- session state -------------------------------------------------------------
+
+  /** Probe `GET /api/auth/me` with whatever credentials we have. */
+  async check(fetchMe: () => Promise<Record<string, any>>): Promise<AuthStatus> {
+    try {
+      await this.ensureFresh()
+      const me = await fetchMe()
+      this.state.set({ status: 'signed-in', user: String(me.name ?? me.email ?? me.sub ?? 'you'), error: undefined, userCode: undefined, verifyUrl: undefined })
+    } catch (e) {
+      if ((e as { status?: number }).status === 401 || (e as { status?: number }).status === 403) {
+        // Only explain when we actually sent credentials (e.g. "oidc: wrong audience"); a plain visitor needs no error.
+        this.state.set({ status: 'signed-out', user: undefined, error: Object.keys(this.headers()).length ? (e as Error).message : undefined })
+      }
+      else this.state.set({ status: 'signed-out', error: (e as Error).message })
+    }
+    return this.state.get().status
+  }
+
+  /** The API said 401 and a refresh did not help. */
+  markSignedOut(error?: string) {
+    if (this.state.get().status === 'pending') return
+    this.state.set({ status: 'signed-out', user: undefined, error })
+  }
+
+  // --- device grant ----------------------------------------------------------------
+
+  /**
+   * Run the whole device flow. `openWindow` is called with the approval URL as soon as it is known
+   * (the UI also shows it, in case popups are blocked). Resolves true when signed in.
+   */
+  async login(openWindow?: (url: string) => void): Promise<boolean> {
+    this.abort?.abort()
+    const abort = (this.abort = new AbortController())
+    try {
+      const issuer = await this.issuer()
+      const clientId = await this.clientId()
+      const startBody = new URLSearchParams({ scope: this.opts.scope ?? 'openid offline_access' })
+      if (clientId) startBody.set('client_id', clientId)
+      for (const a of this.audiences()) startBody.append('resource', a)
+      const start = await this.doFetch(`${issuer}/api/auth/device`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+        body: startBody,
+        signal: abort.signal,
+      })
+      if (!start.ok) throw new Error(`could not start sign-in (${start.status}): ${await start.text().catch(() => '')}`.trim())
+      const g = (await start.json()) as { device_code: string; user_code: string; verification_uri: string; verification_uri_complete?: string; interval?: number; expires_in?: number }
+      const url = g.verification_uri_complete ?? g.verification_uri
+      this.state.set({ status: 'pending', userCode: g.user_code, verifyUrl: url, error: undefined })
+      openWindow?.(url)
+
+      let interval = (g.interval ?? 5) * 1000
+      const deadline = this.now() + (g.expires_in ?? 600) * 1000
+      while (this.now() < deadline) {
+        await this.sleep(interval)
+        if (abort.signal.aborted) return false
+        const poll = await this.doFetch(`${issuer}/api/auth/device/token`, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+          body: new URLSearchParams({ grant_type: DEVICE_GRANT, device_code: g.device_code, ...(clientId ? { client_id: clientId } : {}) }),
+          signal: abort.signal,
+        })
+        const body = (await poll.json().catch(() => ({}))) as any
+        if (poll.ok && body.access_token) {
+          this.save(this.fromResponse(body))
+          this.state.set({ status: 'unknown', userCode: undefined, verifyUrl: undefined })
+          return true
+        }
+        switch (body.error) {
+          case 'authorization_pending':
+            break
+          case 'slow_down':
+            interval += 5000
+            break
+          case 'access_denied':
+            throw new Error('sign-in was denied')
+          case 'expired_token':
+            throw new Error('the code expired - start again')
+          default:
+            throw new Error(body.error_description ?? body.error ?? `sign-in failed (${poll.status})`)
+        }
+      }
+      throw new Error('the code expired - start again')
+    } catch (e) {
+      if (abort.signal.aborted) return false
+      this.state.set({ status: 'signed-out', userCode: undefined, verifyUrl: undefined, error: (e as Error).message })
+      return false
+    }
+  }
+
+  cancel() {
+    this.abort?.abort()
+    this.state.set({ status: 'signed-out', userCode: undefined, verifyUrl: undefined })
+  }
+
+  /** Escape hatch: use a token the developer already has. */
+  useToken(token: string) {
+    this.save({ accessToken: token.trim(), expiresAt: this.now() + 15 * 60_000 })
+  }
+
+  logout() {
+    this.abort?.abort()
+    this.save(null)
+    try {
+      this.persistent?.removeItem('auth.tokens') // the backoffice's copy too: otherwise we'd silently stay signed in
+    } catch {
+      /* ignore */
+    }
+    this.state.set({ status: 'signed-out', user: undefined, userCode: undefined, verifyUrl: undefined, error: undefined })
+  }
+}
diff --git a/src/boot.ts b/src/boot.ts
new file mode 100644
index 0000000..5dc7c9a
--- /dev/null
+++ b/src/boot.ts
@@ -0,0 +1,71 @@
+// Mounts the editor: one host element in the page, the UI inside a shadow root
+// (so editor CSS never leaks into the page and the page's CSS never reaches the
+// editor). The page DOM itself stays server HTML; React only owns the shadow tree.
+import { createElement } from 'react'
+import { createRoot } from 'react-dom/client'
+import type { Root } from 'react-dom/client'
+import { Controller } from './controller'
+import type { ControllerOptions } from './controller'
+import { registerBuiltins } from './editors/builtin'
+import * as registry from './registry'
+import { App } from './ui/App'
+import css from './ui/styles.css?inline'
+import pageCss from './page-style.css?inline'
+
+export const HOST_ID = 'cms-onpage-editor'
+
+export interface EditorHandle {
+  ctrl: Controller
+  registry: typeof registry
+  destroy(): void
+}
+
+export interface BootOptions extends Partial<Pick<ControllerOptions, 'api' | 'reload'>> {
+  /** Start with the developer panel open. */
+  dev?: boolean
+  doc?: Document
+}
+
+export function boot(opts: BootOptions = {}): EditorHandle {
+  const doc = opts.doc ?? document
+  const existing = (doc.defaultView as any)?.__cmsEditor as EditorHandle | undefined
+  if (existing) return existing // idempotent: double-injection is harmless
+
+  const host = doc.createElement('div')
+  host.id = HOST_ID
+  // Sibling of <body>, so body morphs and body-level scans never see it.
+  doc.documentElement.appendChild(host)
+  const shadow = host.attachShadow({ mode: 'open' })
+  const style = doc.createElement('style')
+  style.textContent = css
+  const mount = doc.createElement('div')
+  mount.className = 'cms-root'
+  shadow.append(style, mount)
+
+  const pageStyle = doc.createElement('style')
+  pageStyle.id = `${HOST_ID}-page`
+  pageStyle.textContent = pageCss
+  doc.head.appendChild(pageStyle)
+
+  const offBuiltins = registerBuiltins()
+  const ctrl = new Controller({ host, doc, api: opts.api, reload: opts.reload })
+  if (opts.dev) ctrl.store.set({ dev: true })
+  ctrl.start()
+  const root: Root = createRoot(mount)
+  root.render(createElement(App, { ctrl }))
+
+  const handle: EditorHandle = {
+    ctrl,
+    registry,
+    destroy() {
+      root.unmount()
+      ctrl.destroy()
+      offBuiltins()
+      host.remove()
+      pageStyle.remove()
+      delete (doc.defaultView as any).__cmsEditor
+    },
+  }
+  ;(doc.defaultView as any).__cmsEditor = Object.assign(handle, registry)
+  return handle
+}
diff --git a/src/controller.ts b/src/controller.ts
new file mode 100644
index 0000000..9265bd9
--- /dev/null
+++ b/src/controller.ts
@@ -0,0 +1,1119 @@
+// The controller owns everything stateful: the page scan, selection, the
+// EditClient (undo/redo from server inverses), patch application and the dialog
+// stack. UI components are thin views over `ctrl.store`; extensions get the
+// controller in their props.
+import { createElement } from 'react'
+import type { ReactNode } from 'react'
+import { EditClient, EditError, applyPatches, morphChildren, notifyIslandsAdded, notifyIslandsRemoving } from '@k6n/cms-editor'
+import type { EditResult, Op, Patch } from '@k6n/cms-editor'
+import { Api, ApiError } from './api'
+import type { AuthManager, AuthState } from './auth'
+import type { CmsEdge, CmsNode, JSONSchema, RequestLog } from './api'
+import { blockEditors, editorsFor, inlineEditors } from './registry'
+import { dropTarget, moveTarget } from './page/dnd'
+import { INFERRED_ATTR, collectStrings, getIn, inferBindings, markInferred, parsePath, patchForPath } from './page/infer'
+import type { AttrBinding } from './page/infer'
+import { OTHER_GROUP, acceptsChild, groupOf, labelKey, typeName } from './schema'
+import { describeStyle, patchFor } from './style/model'
+import type { Breakpoint, StyleField } from './style/model'
+import { measureScale, probeMeasure } from './style/tokens'
+import type { Measure, Scale } from './style/tokens'
+import type { DropTarget } from './page/dnd'
+import type { BlockEditorDef, BlockInfo, InlineSession } from './registry'
+import { createStore } from './store'
+import type { Store } from './store'
+
+export interface Block extends BlockInfo {
+  depth: number
+}
+
+export interface DialogInstance {
+  key: number
+  title: string
+  size: 'sm' | 'md' | 'lg'
+  content: ReactNode
+  /** Page-space rect of the block it belongs to, for initial placement. */
+  anchor?: { x: number; y: number }
+  /** Identity for de-duplication: opening a dialog whose id is already open focuses the existing one. */
+  id?: string
+  /** Stacking order (higher = on top); raised when the dialog is opened again or clicked. */
+  z: number
+  /** Bumped to ask the dialog to pulse and take focus. */
+  pulse: number
+}
+
+export interface EditorState {
+  mode: 'edit' | 'browse'
+  selected: string | null
+  hovered: string | null
+  blocks: Block[]
+  /** Bumped when geometry may have changed (scroll/resize/DOM mutation). */
+  tick: number
+  dialogs: DialogInstance[]
+  canUndo: boolean
+  canRedo: boolean
+  busy: number
+  toast: { kind: 'info' | 'error'; text: string; n: number; action?: { label: string; run(): void } } | null
+  drag: { id: string | null; source: 'block' | 'palette'; type?: string; label: string; target: DropTarget | null; pointer?: { x: number; y: number }; /** Alt held: nesting into containers instead of sorting among siblings */ nesting?: boolean } | null
+  /** Attribute-bound properties of the selected block (href, src, alt…), shown as chips on the page. */
+  bindings: AttrBinding[]
+  /** Bumped when a schema finishes loading (editors that match on schema re-evaluate). */
+  schemasVersion: number
+  /** Bumped when node titles (x-graph.label values) become known or change. */
+  labelsVersion: number
+  /** Bumped after every applied edit/undo/redo (open panels re-read their node). */
+  editRev: number
+  /** Left rail: page outline or the block palette. */
+  rail: 'outline' | 'blocks' | null
+  dev: boolean
+  inline: { id: string; field: string } | null
+  log: RequestLog[]
+  /** Page root node id, learned from the first top-level block's parent edge. */
+  rootId: string | null
+  dirty: boolean
+  auth: AuthState
+  undoHint: boolean
+}
+
+export interface ControllerOptions {
+  api?: Api
+  doc?: Document
+  /** Elements belonging to the editor UI (never selectable / morphed). */
+  host: HTMLElement
+  /** Reload strategy when a patch can't be applied. Default: soft re-fetch of the page. */
+  reload?: () => Promise<void>
+}
+
+const BLOCK_SEL = '[data-cms]'
+
+export class Controller {
+  readonly store: Store<EditorState>
+  readonly api: Api
+  readonly auth: AuthManager
+  readonly client: EditClient
+  readonly doc: Document
+  readonly host: HTMLElement
+  private nodes = new Map<string, Promise<CmsNode>>()
+  private edgeCache = new Map<string, Promise<CmsEdge[]>>()
+  private inlineSession: (InlineSession & { id: string }) | null = null
+  private cleanup: Array<() => void> = []
+  private dialogKey = 0
+  private toastN = 0
+  private scanFrame = 0
+  private reloadImpl: () => Promise<void>
+
+  constructor(opts: ControllerOptions) {
+    this.doc = opts.doc ?? document
+    this.host = opts.host
+    this.store = createStore<EditorState>({
+      mode: 'edit',
+      selected: null,
+      hovered: null,
+      blocks: [],
+      tick: 0,
+      dialogs: [],
+      canUndo: false,
+      canRedo: false,
+      busy: 0,
+      toast: null,
+      rail: null,
+      dev: false,
+      inline: null,
+      log: [],
+      rootId: null,
+      dirty: false,
+      auth: { status: 'unknown' },
+      undoHint: false,
+      drag: null,
+      bindings: [],
+      schemasVersion: 0,
+      labelsVersion: 0,
+      editRev: 0,
+    })
+    this.api = opts.api ?? new Api()
+    this.auth = this.api.auth
+    this.auth.state.subscribe(() => this.onAuthChange())
+    // Feed the dev panel even when the caller supplied its own Api.
+    const prevLog = this.api.opts.onLog
+    this.api.opts.onLog = (e) => {
+      prevLog?.(e)
+      this.store.set((s) => ({ log: [...s.log.slice(-99), e] }))
+    }
+    this.client = new EditClient({
+      fetch: this.api.loggedFetch,
+      onPatches: (patches, res) => this.onPatches(patches, res),
+      onChange: () => this.store.set({ canUndo: this.client.canUndo, canRedo: this.client.canRedo }),
+    })
+    this.reloadImpl = opts.reload ?? (() => this.softReload())
+  }
+
+  // --- lifecycle ----------------------------------------------------------
+
+  start(): void {
+    const doc = this.doc
+    const win = doc.defaultView!
+    this.scan()
+    // Already signed in? The page we hold may be the published file: swap in the live preview now.
+    void this.checkAuth().then(async (st) => {
+      if (st === 'signed-in') {
+        this.lastPreview = Date.now()
+        await this.softReload()
+        void this.loadTree()
+      }
+      this.scan()
+    })
+    this.doc.addEventListener('visibilitychange', this.onVisible)
+    this.cleanup.push(() => this.doc.removeEventListener('visibilitychange', this.onVisible))
+    const on = <K extends keyof DocumentEventMap>(t: K, f: (e: DocumentEventMap[K]) => void, capture = true) => {
+      doc.addEventListener(t, f, capture)
+      this.cleanup.push(() => doc.removeEventListener(t, f, capture))
+    }
+    on('click', (e) => this.onClick(e))
+    on('dblclick', (e) => this.onDblClick(e))
+    on('mouseover', (e) => this.onHover(e))
+    on('keydown', (e) => this.onKey(e))
+    const tick = () => this.store.set((s) => ({ tick: s.tick + 1 }))
+    win.addEventListener('scroll', tick, { passive: true, capture: true })
+    win.addEventListener('resize', tick)
+    this.cleanup.push(() => win.removeEventListener('scroll', tick, true), () => win.removeEventListener('resize', tick))
+    const mo = new win.MutationObserver((records) => {
+      if (records.every((r) => this.host.contains(r.target))) return
+      this.scheduleScan()
+    })
+    mo.observe(doc.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['data-cms', 'data-cms-type', 'data-cms-container'] })
+    this.cleanup.push(() => mo.disconnect())
+    // Edit mode: stop links/forms from navigating away mid-edit.
+    doc.documentElement.setAttribute('data-cms-editing', this.store.get().mode)
+    this.cleanup.push(() => doc.documentElement.removeAttribute('data-cms-editing'))
+  }
+
+  destroy(): void {
+    this.clearPreview()
+    this.cancelDrag()
+    this.stopInline()
+    this.cleanup.forEach((f) => f())
+    this.cleanup = []
+    if (this.scanFrame) this.doc.defaultView!.cancelAnimationFrame(this.scanFrame)
+  }
+
+  // --- page scan ----------------------------------------------------------
+
+  private scheduleScan() {
+    if (this.scanFrame) return
+    const win = this.doc.defaultView!
+    this.scanFrame = win.requestAnimationFrame(() => {
+      this.scanFrame = 0
+      this.scan()
+    })
+  }
+
+  scan(): Block[] {
+    const els = Array.from(this.doc.querySelectorAll<HTMLElement>(BLOCK_SEL)).filter((el) => !this.host.contains(el))
+    const blocks: Block[] = els.map((el) => {
+      const parent = el.parentElement?.closest<HTMLElement>(BLOCK_SEL) ?? null
+      let depth = 0
+      for (let p = parent; p; p = p.parentElement?.closest<HTMLElement>(BLOCK_SEL) ?? null) depth++
+      const type = el.getAttribute('data-cms-type') ?? ''
+      const ctrl = this
+      return {
+        id: el.getAttribute('data-cms') ?? '',
+        type,
+        el,
+        container: el.getAttribute('data-cms-container') === 'true',
+        parentId: parent?.getAttribute('data-cms') ?? undefined,
+        depth,
+        get schema() {
+          return ctrl.schemaCache.get(type)
+        },
+      }
+    })
+    this.prefetchSchemas(blocks.map((b) => b.type))
+    const prev = this.store.get().blocks
+    const same = prev.length === blocks.length && prev.every((b, i) => b.el === blocks[i].el && b.type === blocks[i].type && b.container === blocks[i].container)
+    this.store.set((s) => ({ blocks: same ? s.blocks : blocks, tick: s.tick + 1 }))
+    return blocks
+  }
+
+  block(id: string | null | undefined): Block | undefined {
+    return id ? this.store.get().blocks.find((b) => b.id === id) : undefined
+  }
+
+  private blockFromEvent(e: Event): Block | undefined {
+    if (e.composedPath().includes(this.host)) return undefined
+    const el = (e.target instanceof Element ? e.target : null)?.closest<HTMLElement>(BLOCK_SEL)
+    return el ? this.store.get().blocks.find((b) => b.el === el) : undefined
+  }
+
+  /** Editing is live: edit mode AND a signed-in session. */
+  get active(): boolean {
+    const s = this.store.get()
+    return s.mode === 'edit' && s.auth.status === 'signed-in'
+  }
+
+  // --- sign-in ---------------------------------------------------------------
+
+  private lastStatus = 'unknown'
+  private onAuthChange() {
+    const auth = this.auth.state.get()
+    this.store.set({ auth })
+    if (auth.status === 'signed-out' && this.lastStatus === 'signed-in') {
+      this.stopInline()
+      this.store.set({ selected: null, hovered: null })
+    }
+    if (auth.status === 'signed-in' && this.lastStatus !== 'signed-in') queueMicrotask(() => this.scan())
+    this.lastStatus = auth.status
+  }
+
+  /** Probe the session; the login panel appears when it fails. */
+  async checkAuth() {
+    return this.auth.check(() => this.api.me())
+  }
+
+  async signIn() {
+    // Open the tab inside the click's user gesture; point it at the approval page once known.
+    const w = typeof window !== 'undefined' ? window.open('', '_blank') : null
+    if (w) w.opener = null
+    const ok = await this.auth.login((url) => {
+      if (w) w.location.href = url
+    })
+    if (w && !w.closed) w.close()
+    if (ok) await this.afterSignIn()
+  }
+
+  /** Paste-a-token escape hatch. */
+  async signInWithToken(token: string) {
+    this.auth.useToken(token)
+    await this.afterSignIn()
+  }
+
+  private async afterSignIn() {
+    if ((await this.checkAuth()) !== 'signed-in') return
+    this.client.clear()
+    this.nodes.clear()
+    this.edgeCache.clear()
+    await this.softReload() // the page may have been the published one: swap to live preview
+    this.scan()
+    void this.loadTree()
+    this.toast('info', `Signed in as ${this.auth.state.get().user}`)
+  }
+
+  signOut() {
+    this.auth.logout()
+    this.toast('info', 'Signed out')
+  }
+
+  // --- selection & events -------------------------------------------------
+
+  select(id: string | null, opts: { scroll?: boolean } = {}) {
+    if (id !== this.store.get().selected) {
+      this.stopInline()
+      this.clearInferred()
+    }
+    this.store.set({ selected: id })
+    void this.refreshBindings()
+    if (id && opts.scroll) this.block(id)?.el.scrollIntoView({ block: 'center', behavior: 'smooth' })
+  }
+
+  setMode(mode: 'edit' | 'browse') {
+    this.stopInline()
+    this.store.set({ mode, selected: mode === 'browse' ? null : this.store.get().selected, hovered: null })
+    this.doc.documentElement.setAttribute('data-cms-editing', mode)
+  }
+
+  private onHover(e: MouseEvent) {
+    if (!this.active) return
+    const b = this.blockFromEvent(e)
+    const id = b?.id ?? null
+    if (id !== this.store.get().hovered) this.store.set({ hovered: id })
+  }
+
+  private onClick(e: MouseEvent) {
+    if (!this.active || e.composedPath().includes(this.host)) return
+    if (this.inlineSession && (e.target as Element)?.closest?.('[contenteditable]')) return // caret placement
+    const b = this.blockFromEvent(e)
+    if (!b) return
+    e.preventDefault()
+    e.stopPropagation()
+    // Second click on a text field of the already-selected block edits it in place.
+    const fieldEl = (e.target as Element).closest<HTMLElement>('[data-cms-field][data-cms-editor]')
+    if (b.id === this.store.get().selected && fieldEl && fieldEl.closest(BLOCK_SEL) === b.el) return void this.startInline(b.id, fieldEl)
+    this.select(b.id)
+  }
+
+  private onDblClick(e: MouseEvent) {
+    if (!this.active) return
+    const b = this.blockFromEvent(e)
+    if (!b) return
+    e.preventDefault()
+    e.stopPropagation()
+    const fieldEl = (e.target as Element).closest<HTMLElement>('[data-cms-field][data-cms-editor]')
+    if (fieldEl && b.el.contains(fieldEl) && fieldEl.closest(BLOCK_SEL) === b.el) {
+      void this.startInline(b.id, fieldEl)
+      return
+    }
+    const def = editorsFor(b).find((d) => d.onDoubleClick) ?? editorsFor(b)[0]
+    if (def) void this.openEditor(def, b.id)
+  }
+
+  private onKey(e: KeyboardEvent) {
+    const t = e.target as HTMLElement | null
+    const typing = !!t && (t.isContentEditable || /^(input|textarea|select)$/i.test(t.tagName))
+    const inHost = e.composedPath().includes(this.host)
+    if (e.key === 'Escape') {
+      const { dialogs } = this.store.get()
+      if (dialogs.length) this.closeDialog(dialogs.reduce((top, x) => (x.z > top.z ? x : top)).key)
+      else if (this.inlineSession) this.stopInline()
+      else if (this.store.get().selected) this.select(null)
+      else return
+      e.preventDefault()
+      return
+    }
+    if (typing || inHost) return
+    const mod = e.metaKey || e.ctrlKey
+    if (mod && e.key.toLowerCase() === 'z') {
+      e.preventDefault()
+      void (e.shiftKey ? this.redo() : this.undo())
+    } else if (mod && e.key.toLowerCase() === 'y') {
+      e.preventDefault()
+      void this.redo()
+    } else if ((e.key === 'Delete' || e.key === 'Backspace') && this.store.get().selected && this.active) {
+      e.preventDefault()
+      void this.remove(this.store.get().selected!)
+    }
+  }
+
+  // --- data ----------------------------------------------------------------
+
+  node(id: string, fresh = false): Promise<CmsNode> {
+    if (fresh) this.nodes.delete(id)
+    let p = this.nodes.get(id)
+    if (!p) {
+      p = this.api.node(id)
+      p.then((n) => this.remember(n)).catch(() => this.nodes.delete(id))
+      this.nodes.set(id, p)
+    }
+    return p
+  }
+
+  // --- node titles (x-graph.label) and groups (x-graph.group) -------------------------------
+
+  private snaps = new Map<string, CmsNode>()
+  private snapAsked = new Set<string>()
+  private labelsTimer: ReturnType<typeof setTimeout> | null = null
+  private remember(n: CmsNode) {
+    this.snaps.set(n.id, n)
+    // coalesce: a page load remembers dozens of nodes at once
+    this.labelsTimer ??= setTimeout(() => {
+      this.labelsTimer = null
+      this.store.set((st) => ({ labelsVersion: st.labelsVersion + 1 }))
+    }, 16)
+  }
+
+  /**
+   * The node's title: the value of the property its type names in `x-graph.label` ("title"), or undefined
+   * (no label key, empty, or not loaded yet - in which case it is fetched in the background and
+   * `labelsVersion` bumps when it arrives).
+   */
+  labelFor(id: string): string | undefined {
+    const n = this.snaps.get(id)
+    if (!n) {
+      if (this.signedIn() && !this.snapAsked.has(id)) {
+        this.snapAsked.add(id)
+        void this.node(id).catch(() => this.snapAsked.delete(id))
+      }
+      return undefined
+    }
+    const key = labelKey(this.schemaCache.get(n.dataType))
+    const v = key ? n.data?.[key] : undefined
+    const text = typeof v === 'string' || typeof v === 'number' ? String(v).replace(/\s+/g, ' ').trim() : ''
+    return text ? (text.length > 40 ? `${text.slice(0, 39)}…` : text) : undefined
+  }
+
+  private staticRoots = new Set<string>()
+  /**
+   * `/api/types` carries every type's full schema (and whether it is a page root), so one request seeds
+   * titles, groups, labels and acceptance rules for all types - no per-type schema fetch needed.
+   */
+  ingestTypes(entries: unknown[]) {
+    let changed = false
+    for (const e of entries as Array<{ type?: string; schema?: JSONSchema; staticRoot?: boolean }>) {
+      const t = typeName(e)
+      if (!t) continue
+      if (e && typeof e === 'object' && e.schema && typeof e.schema === 'object' && !this.schemaCache.has(t)) {
+        this.schemaCache.set(t, e.schema)
+        changed = true
+      }
+      if (e && typeof e === 'object' && e.staticRoot) this.staticRoots.add(t)
+    }
+    if (changed) this.store.set((st) => ({ schemasVersion: st.schemasVersion + 1 }))
+  }
+  /** Page-root types (static pages): they are not blocks you insert into a page. */
+  isStaticRoot(type: string) {
+    return this.staticRoots.has(type)
+  }
+  /** Human name of a type: the schema's `title` ("Horizontal row"), else the type id. */
+  typeTitle(type: string): string {
+    const t = this.schemaCache.get(type)?.title
+    return typeof t === 'string' && t ? t : type
+  }
+
+  /** Category of a type (x-graph.group); OTHER_GROUP when unknown or unlabelled. */
+  groupOfType(type: string): string {
+    return groupOf(this.schemaCache.get(type)) ?? OTHER_GROUP
+  }
+
+  /** Load schemas for these types in the background (bounded concurrency); bumps schemasVersion as they land. */
+  async loadSchemas(types: string[], concurrency = 6): Promise<void> {
+    const todo = types.filter((t) => t && !this.schemaCache.has(t))
+    let next = 0
+    const worker = async () => {
+      while (next < todo.length) {
+        const t = todo[next++]
+        try {
+          this.schemaCache.set(t, await this.api.schema(t))
+        } catch {
+          /* a type without a schema just stays in "Other" */
+        }
+      }
+      this.store.set((st) => ({ schemasVersion: st.schemasVersion + 1 }))
+    }
+    await Promise.all(Array.from({ length: Math.min(concurrency, todo.length) }, worker))
+  }
+
+  /** One request for the whole page's node data (and child edges) instead of one per block. */
+  async loadTree(): Promise<void> {
+    try {
+      const root = await this.pageRoot()
+      const tree = await this.api.get<any>(`/api/tree/${encodeURIComponent(root)}?depth=-1`)
+      const walk = (t: any) => {
+        const n = t?.node as CmsNode | undefined
+        if (n?.id) {
+          this.nodes.set(n.id, Promise.resolve(n))
+          this.snapAsked.add(n.id)
+          this.remember(n)
+        }
+        for (const c of t?.children ?? []) walk(c)
+      }
+      walk(tree)
+    } catch {
+      /* labels then arrive lazily, per node */
+    }
+  }
+  schema = (type: string): Promise<JSONSchema> => this.api.schema(type)
+
+  private schemaCache = new Map<string, JSONSchema>()
+  private schemaFailed = new Map<string, number>()
+  private typesRequested = false
+  /** Synchronous schema lookup for editors that match on schema; undefined until loaded. */
+  schemaOf(type: string): JSONSchema | undefined {
+    return this.schemaCache.get(type)
+  }
+  /** Load schemas for the types on the page (and the style wrapper) in the background. */
+  private prefetchSchemas(types: Iterable<string>) {
+    if (!this.signedIn()) return
+    if (!this.typeList.length && !this.typesRequested) {
+      this.typesRequested = true
+      this.api
+        .types()
+        .then((ts) => {
+          this.typeList = ts.map(typeName).filter(Boolean)
+          this.ingestTypes(ts)
+          this.store.set((st) => ({ schemasVersion: st.schemasVersion + 1 }))
+        })
+        .catch(() => (this.typesRequested = false))
+    }
+    for (const t of new Set([...types, 'layout'])) {
+      if (!t || this.schemaCache.has(t) || Date.now() - (this.schemaFailed.get(t) ?? 0) < 30_000) continue
+      this.schemaFailed.set(t, Date.now()) // in flight / just failed: do not hammer
+      this.api
+        .schema(t)
+        .then((s) => {
+          this.schemaCache.set(t, s)
+          this.schemaFailed.delete(t)
+          this.store.set((st) => ({ schemasVersion: st.schemasVersion + 1 }))
+        })
+        .catch(() => {})
+    }
+  }
+  private typeList: string[] = []
+  /** Node type names the CMS knows (for `x-graph.children: true`). */
+  get allTypes(): string[] {
+    return this.typeList
+  }
+  /** Can `type` be inserted into the block `parentId` ('' = page root, always allowed)? */
+  accepts(parentId: string, type: string): boolean {
+    if (!parentId) return true
+    const b = this.block(parentId)
+    return !!b && acceptsChild(b.schema, type, this.typeList)
+  }
+
+  /** The node type used to wrap blocks for styling: the schema tagged `x-style.wrapper`. */
+  wrapperType(): string | undefined {
+    for (const [t, s] of this.schemaCache) if (s['x-style']?.wrapper) return t
+    return undefined
+  }
+
+  /** Parent edges of a node (cached until the next structural change). */
+  private parentEdges(id: string): Promise<CmsEdge[]> {
+    let p = this.edgeCache.get(`in:${id}`)
+    if (!p) {
+      p = this.api.edges(id).then((r) => r.into ?? [])
+      p.catch(() => this.edgeCache.delete(`in:${id}`))
+      this.edgeCache.set(`in:${id}`, p)
+    }
+    return p
+  }
+  private childEdges(id: string): Promise<CmsEdge[]> {
+    let p = this.edgeCache.get(`out:${id}`)
+    if (!p) {
+      p = this.api.edges(id).then((r) => (r.from ?? []).filter((e) => !e.type || e.type === 'child').sort((a, b) => a.sort - b.sort))
+      p.catch(() => this.edgeCache.delete(`out:${id}`))
+      this.edgeCache.set(`out:${id}`, p)
+    }
+    return p
+  }
+
+  /** The composition edge that places this block in its parent. */
+  async edgeOf(id: string): Promise<CmsEdge> {
+    const b = this.block(id)
+    const attr = b?.el.getAttribute('data-cms-edge')
+    const into = (await this.parentEdges(id)).filter((e) => !e.type || e.type === 'child')
+    const hit = attr ? into.find((e) => e.id === attr) : undefined
+    const edge = hit ?? into.find((e) => e.from === b?.parentId) ?? (b?.parentId ? undefined : into[0])
+    if (!edge) throw new Error(`cannot resolve the edge of ${id} (parent ${b?.parentId ?? 'page root'})`)
+    if (!b?.parentId && this.store.get().rootId !== edge.from) this.store.set({ rootId: edge.from })
+    return edge
+  }
+
+  /** Parent id for inserting at page level (the page root node). */
+  async parentIdOf(id: string): Promise<string> {
+    return (await this.edgeOf(id)).from
+  }
+
+  // --- edits -----------------------------------------------------------------
+
+  /** Run an edit batch; shows errors, tracks busy state, resolves null on failure. */
+  async apply(ops: Op[], opts: { coalesce?: string } = {}): Promise<EditResult | null> {
+    this.store.set((s) => ({ busy: s.busy + 1 }))
+    try {
+      const res = await this.client.apply(ops, opts)
+      this.store.set({ dirty: true })
+      return res
+    } catch (e) {
+      this.fail(e)
+      return null
+    } finally {
+      this.store.set((s) => ({ busy: s.busy - 1 }))
+    }
+  }
+
+  setData(id: string, data: Record<string, unknown>, opts: { coalesce?: string; version?: number } = {}) {
+    const op: Op = { op: 'set', id, data, ...(opts.version !== undefined ? { version: opts.version } : {}) }
+    return this.apply([op], { coalesce: opts.coalesce })
+  }
+
+  async insert(parent: string, type: string, opts: { index?: number; handle?: string; data?: Record<string, unknown> } = {}) {
+    const res = await this.apply([{ op: 'insert', parent, type, ...opts }])
+    const created = res?.results[0]?.node
+    if (created) await this.selectCreated(created)
+    return res
+  }
+
+  async insertBlueprint(parent: string, blueprint: string, index?: number) {
+    const res = await this.apply([{ op: 'blueprint', parent, blueprint, ...(index !== undefined ? { index } : {}) }])
+    const created = res?.results[0]?.node
+    if (created) await this.selectCreated(created)
+    return res
+  }
+
+  async remove(id: string) {
+    try {
+      const edge = await this.edgeOf(id)
+      this.select(null)
+      const res = await this.apply([{ op: 'delete', edge: edge.id }])
+      if (res) this.toast('info', 'Block deleted', { label: 'Undo', run: () => void this.undo() })
+      return res
+    } catch (e) {
+      this.fail(e)
+      return null
+    }
+  }
+
+  async duplicate(id: string) {
+    try {
+      const edge = await this.edgeOf(id)
+      const res = await this.apply([{ op: 'duplicate', edge: edge.id }])
+      const created = res?.results[0]?.node
+      if (created) await this.selectCreated(created)
+      return res
+    } catch (e) {
+      this.fail(e)
+      return null
+    }
+  }
+
+  /** Move a block one position within its parent. */
+  async nudge(id: string, dir: -1 | 1) {
+    try {
+      const edge = await this.edgeOf(id)
+      const sibs = await this.childEdges(edge.from)
+      const i = sibs.findIndex((e) => e.id === edge.id)
+      const j = i + dir
+      if (i < 0 || j < 0 || j >= sibs.length) return null
+      return await this.apply([{ op: 'move', edge: edge.id, index: j }])
+    } catch (e) {
+      this.fail(e)
+      return null
+    }
+  }
+
+  private async selectCreated(id: string) {
+    await this.whenRendered()
+    this.select(id, { scroll: true })
+  }
+
+  /** Index of the block among its parent's children, and the sibling count. */
+  async position(id: string): Promise<{ index: number; count: number }> {
+    const edge = await this.edgeOf(id)
+    const sibs = await this.childEdges(edge.from)
+    return { index: sibs.findIndex((e) => e.id === edge.id), count: sibs.length }
+  }
+
+  async childCount(parent: string): Promise<number> {
+    return (await this.childEdges(parent)).length
+  }
+
+  undo = () => this.guard(() => this.client.undo())
+  redo = () => this.guard(() => this.client.redo())
+  private async guard(fn: () => Promise<EditResult | null>) {
+    this.store.set((s) => ({ busy: s.busy + 1 }))
+    try {
+      return await fn()
+    } catch (e) {
+      this.fail(e)
+      return null
+    } finally {
+      this.store.set((s) => ({ busy: s.busy - 1 }))
+    }
+  }
+
+  async publish() {
+    try {
+      const rootId = await this.pageRoot()
+      await this.api.publish([rootId])
+      this.store.set({ dirty: false })
+      this.toast('info', 'Published')
+    } catch (e) {
+      this.fail(e)
+    }
+  }
+
+  /** The page root node id (learned from the first top-level block's parent edge). */
+  async pageRoot(): Promise<string> {
+    const id = this.store.get().rootId ?? (await this.discoverRoot())
+    if (!id) throw new Error('This page has no editable blocks to learn the page node from')
+    return id
+  }
+
+  private async discoverRoot(): Promise<string | null> {
+    const top = this.store.get().blocks.find((b) => !b.parentId)
+    if (!top) return null
+    return (await this.edgeOf(top.id)).from
+  }
+
+  // --- patches ---------------------------------------------------------------
+
+  /** Resolves once the DOM reflects the last edit (immediately, unless a soft reload is running). */
+  private rendered: Promise<void> = Promise.resolve()
+  whenRendered(): Promise<void> {
+    return this.rendered
+  }
+
+  private onPatches(patches: Patch[], res: EditResult) {
+    for (const id of res.touched ?? []) {
+      this.nodes.delete(id)
+      if (this.snaps.has(id)) void this.node(id).catch(() => {}) // keep titles live (old title stays until the new one lands)
+    }
+    this.store.set((st) => ({ editRev: st.editRev + 1 }))
+    this.edgeCache.clear() // structure may have changed
+    const active = this.doc.activeElement
+    const report = applyPatches(this.doc.body, patches, {
+      skip: (el) => !!this.inlineSession && el instanceof HTMLElement && el.isContentEditable && (el.contains(active) || el === active),
+    })
+    // Touched nodes the server could not re-render standalone (e.g. the page itself).
+    const needsReload = report.failed.length > 0
+    this.scan()
+    void this.refreshBindings()
+    if (needsReload) this.rendered = this.reloadImpl().then(() => void this.scan())
+    // Drop a selection whose block vanished.
+    const sel = this.store.get().selected
+    if (sel && !this.block(sel)) this.store.set({ selected: null })
+  }
+
+  /**
+   * The live render of this page. A browser navigation can't carry our bearer token, so the edge may
+   * have served the *published* file even with the preview cookie set; asking the API ourselves is
+   * what guarantees the latest content. Order: `/api/preview?path=` (documented), the same with the
+   * page's locale, then the page URL with the preview header (edge routing) as a last resort.
+   */
+  private async fetchPreviewHtml(): Promise<string> {
+    const path = location.pathname
+    const lang = this.doc.documentElement.lang
+    const attempts: Array<[string, Record<string, string>]> = [[`/api/preview?path=${encodeURIComponent(path)}`, {}]]
+    if (lang) attempts.push([`/api/preview?path=${encodeURIComponent(path)}&locale=${encodeURIComponent(lang)}`, {}])
+    attempts.push([location.pathname + location.search, { 'X-CMS-Preview': '1' }])
+    let last = 'no response'
+    for (const [url, headers] of attempts) {
+      const resp = await this.api.doFetch(url, { cache: 'no-store', headers: { Accept: 'text/html', ...headers } })
+      const type = resp.headers.get('content-type') ?? ''
+      if (resp.ok && (type.includes('html') || !type)) return resp.text()
+      last = `${url.split('?')[0]} ${resp.status}`
+      if (resp.status === 401 || resp.status === 403) break // trying other URLs will not help
+    }
+    throw new Error(last)
+  }
+
+  /** Morph the page to the latest preview render (no reload, scroll and focus stay). */
+  async softReload(): Promise<void> {
+    try {
+      const fresh = new DOMParser().parseFromString(await this.fetchPreviewHtml(), 'text/html')
+      const out = morphChildren(this.doc.body, fresh.body, {
+        skip: (el) => this.host.contains(el) || (el instanceof HTMLElement && el.isContentEditable),
+        willRemove: notifyIslandsRemoving,
+      })
+      out.added.forEach(notifyIslandsAdded)
+      this.scan()
+    } catch (e) {
+      this.toast('error', `Could not load the latest preview (${(e as Error).message})`)
+    }
+  }
+
+  private lastPreview = 0
+  /** Pull the latest content when the tab comes back (other editors may have changed things). */
+  private onVisible = () => {
+    if (this.doc.visibilityState !== 'visible' || !this.signedIn() || this.inlineSession || this.store.get().busy) return
+    if (Date.now() - this.lastPreview < 5000) return
+    this.lastPreview = Date.now()
+    this.nodes.clear()
+    this.edgeCache.clear()
+    void this.softReload()
+  }
+  private signedIn = () => this.store.get().auth.status === 'signed-in'
+
+  // --- visual style (x-style fields) -------------------------------------------------
+
+  /** Pixel measurement of a CSS custom property; replaceable (tests have no layout). */
+  measure: Measure | null = null
+  private scales = new Map<string, Scale>()
+
+  styleFields(id: string): StyleField[] {
+    return describeStyle(this.block(id)?.schema)
+  }
+
+  /** Token -> px for a spacing/gap field, measured from the page's CSS (cached per viewport width). */
+  scaleFor(field: StyleField): Scale {
+    const key = `${field.name}:${field.token ?? ''}:${this.doc.defaultView?.innerWidth}`
+    let sc = this.scales.get(key)
+    if (!sc) {
+      sc = measureScale(field, this.measure ?? probeMeasure(this.doc), this.doc)
+      this.scales.set(key, sc)
+    }
+    return sc
+  }
+
+  /** Set one style field (base, or a breakpoint override) as a single, coalesced undo step. */
+  async setStyle(id: string, field: StyleField, value: unknown, opts: { bp?: Breakpoint } = {}) {
+    const node = await this.node(id)
+    return this.setData(id, patchFor(node.data ?? {}, field, value, opts.bp), { coalesce: `style:${id}:${field.name}:${opts.bp ?? ''}` })
+  }
+
+  private previewed = new Map<HTMLElement, string[]>()
+  /** Live preview while dragging: inline style on the block's elements, removed by clearPreview(). */
+  previewStyle(id: string, property: string, px: number) {
+    for (const b of this.store.get().blocks.filter((x) => x.id === id)) {
+      b.el.style.setProperty(property, `${px}px`, 'important')
+      const list = this.previewed.get(b.el) ?? []
+      if (!list.includes(property)) list.push(property)
+      this.previewed.set(b.el, list)
+    }
+  }
+  clearPreview() {
+    for (const [el, props] of this.previewed) for (const p of props) el.style.removeProperty(p)
+    this.previewed.clear()
+  }
+
+  /**
+   * Give a block spacing/layout controls it does not have by wrapping it in the wrapper type
+   * (the schema tagged `x-style.wrapper`, i.e. `layout`). One atomic batch: insert the wrapper where
+   * the block is, then move the block into it - so undo restores the page in one step.
+   */
+  async wrapInLayout(id: string) {
+    const type = this.wrapperType()
+    if (!type) return this.toast('error', 'No wrapper type (x-style.wrapper) is available for this site')
+    try {
+      const edge = await this.edgeOf(id)
+      const { index } = await this.position(id)
+      const wid = `w${Math.random().toString(36).slice(2, 10)}`
+      const res = await this.apply([
+        // `id` is accepted by POST /api/edit (docs/onpage-editor.md) but missing from the shared InsertOp type
+        { op: 'insert', parent: edge.from, type, index, id: wid, data: { flow: 'stack' } } as Op,
+        { op: 'move', edge: edge.id, parent: wid, index: 0 },
+      ])
+      if (!res) return
+      await this.whenRendered()
+      this.select(wid, { scroll: false })
+      void this.openEditor('style', wid)
+    } catch (e) {
+      this.fail(e)
+    }
+  }
+
+  // --- drag & drop (existing blocks and palette items share one engine) ---------------------
+
+  private dragCleanup: (() => void) | null = null
+
+  /** Start dragging an existing block (from its grip). */
+  beginDrag(id: string) {
+    const b = this.block(id)
+    this.select(id)
+    this.startDrag({ id, source: 'block', type: b?.type, label: this.labelFor(id) ?? b?.type ?? 'block' }, (target) => void this.dropBlock(id, target))
+  }
+
+  /** Start dragging a new block type (or blueprint) out of the palette. */
+  beginPaletteDrag(item: { type?: string; blueprint?: string; label: string }) {
+    const type = item.type
+    this.startDrag({ id: null, source: 'palette', type, label: item.label }, (target) => void this.dropNew(target, item))
+  }
+
+  private startDrag(d: { id: string | null; source: 'block' | 'palette'; type?: string; label: string }, onDrop: (t: DropTarget) => void) {
+    this.cancelDrag()
+    const doc = this.doc
+    this.store.set({ drag: { ...d, target: null } })
+    doc.documentElement.setAttribute('data-cms-dragging', '')
+    // Rects are measured per move from the live DOM; the ghost is an overlay (not a DOM node), so the
+    // page never reflows under the pointer and the drop target cannot jitter.
+    const compute = (x: number, y: number, nest: boolean) => {
+      const blocks = this.store.get().blocks.map((b) => {
+        const r = b.el.getBoundingClientRect()
+        return { id: b.id, parentId: b.parentId, container: b.container, depth: b.depth, rect: { x: r.x, y: r.y, w: r.width, h: r.height } }
+      })
+      const accepts = d.type ? (parent: string) => this.accepts(parent, d.type!) : undefined
+      // Existing blocks sort among their siblings by default (snapping); Alt nests into the container under the pointer.
+      if (d.source === 'block' && d.id) return moveTarget(blocks, { x, y }, { id: d.id, parentId: this.block(d.id)?.parentId }, { nest, accepts })
+      return dropTarget(blocks, { x, y }, d.id, accepts)
+    }
+    let last: { x: number; y: number; alt: boolean } | null = null
+    const update = () => last && this.store.set({ drag: { ...d, target: compute(last.x, last.y, last.alt), pointer: { x: last.x, y: last.y }, nesting: last.alt } })
+    const move = (e: PointerEvent) => {
+      last = { x: e.clientX, y: e.clientY, alt: e.altKey }
+      update()
+    }
+    const up = (e: PointerEvent) => {
+      const target = compute(e.clientX, e.clientY, e.altKey)
+      this.cancelDrag()
+      if (target) onDrop(target)
+    }
+    const key = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') return void (e.stopPropagation(), this.cancelDrag())
+      if (e.key === 'Alt' && last) {
+        last.alt = e.type === 'keydown' // re-target the moment Alt is pressed/released, without waiting for a move
+        update()
+      }
+    }
+    doc.addEventListener('pointermove', move, true)
+    doc.addEventListener('pointerup', up, true)
+    doc.addEventListener('keydown', key, true)
+    doc.addEventListener('keyup', key, true)
+    this.dragCleanup = () => {
+      doc.removeEventListener('pointermove', move, true)
+      doc.removeEventListener('pointerup', up, true)
+      doc.removeEventListener('keydown', key, true)
+      doc.removeEventListener('keyup', key, true)
+    }
+  }
+
+  cancelDrag() {
+    this.dragCleanup?.()
+    this.dragCleanup = null
+    this.doc.documentElement.removeAttribute('data-cms-dragging')
+    if (this.store.get().drag) this.store.set({ drag: null })
+  }
+
+  /** Commit a block move: one `move` op (re-parent and/or reorder). */
+  async dropBlock(id: string, target: DropTarget) {
+    try {
+      const edge = await this.edgeOf(id)
+      const parent = target.parentId || (await this.pageRoot())
+      const sibs = await this.childEdges(edge.from)
+      const cur = sibs.findIndex((e) => e.id === edge.id)
+      if (parent === edge.from && cur === target.index) return null // dropped where it was
+      return await this.apply([{ op: 'move', edge: edge.id, parent, index: target.index }])
+    } catch (e) {
+      this.fail(e)
+      return null
+    }
+  }
+
+  /** Commit a palette drop: insert a new node (or blueprint) at the drop position. */
+  async dropNew(target: DropTarget, item: { type?: string; blueprint?: string }) {
+    try {
+      const parent = target.parentId || (await this.pageRoot())
+      if (item.blueprint) return await this.insertBlueprint(parent, item.blueprint, target.index)
+      if (item.type) return await this.insert(parent, item.type, { index: target.index })
+    } catch (e) {
+      this.fail(e)
+    }
+    return null
+  }
+
+  // --- every property editable where it is rendered ---------------------------------------
+
+  /** Remove the markers inference put on the page (the next selection re-infers for its own block). */
+  private clearInferred() {
+    for (const el of this.doc.querySelectorAll(`[${INFERRED_ATTR}]`)) {
+      el.removeAttribute('data-cms-field')
+      el.removeAttribute('data-cms-editor')
+      el.removeAttribute(INFERRED_ATTR)
+    }
+    if (this.store.get().bindings.length) this.store.set({ bindings: [] })
+  }
+
+  /**
+   * Bind the selected block's string properties (nested arrays/objects included) to what the page renders:
+   * text leaves become inline fields, attribute matches become chips. Re-run after every patch, since a
+   * morph rewrites the attributes we added.
+   */
+  async refreshBindings(): Promise<void> {
+    const id = this.store.get().selected
+    const block = this.block(id)
+    if (!id || !block || !this.active) return this.clearInferred()
+    try {
+      const node = await this.node(id)
+      if (this.store.get().selected !== id || !block.el.isConnected) return
+      const schema = block.schema ?? (await this.schema(node.dataType).catch(() => undefined))
+      const owns = (el: Element) => el.closest(BLOCK_SEL) === block.el
+      const found = inferBindings(block.el, owns, collectStrings(node.data ?? {}, schema))
+      markInferred(block.el, found.text)
+      this.store.set({ bindings: found.attrs })
+    } catch {
+      /* binding is a convenience; the Properties dialog always works */
+    }
+  }
+
+  /** Write one string at a (possibly nested) path of a node's data. */
+  async setPath(id: string, key: string, value: string, opts: { coalesce?: string } = {}) {
+    const path = parsePath(key)
+    const data = path.length === 1 ? {} : (await this.node(id)).data ?? {}
+    return this.setData(id, patchForPath(data, path, value), { coalesce: opts.coalesce ?? `path:${id}:${key}` })
+  }
+
+  // --- inline editing --------------------------------------------------------
+
+  async startInline(id: string, fieldEl: HTMLElement) {
+    this.stopInline()
+    const field = fieldEl.getAttribute('data-cms-field')!
+    const kind = fieldEl.getAttribute('data-cms-editor')!
+    const def = inlineEditors.get(kind)
+    if (!def) return this.toast('error', `No inline editor "${kind}" registered`)
+    try {
+      const node = await this.node(id, true)
+      if (this.store.get().selected !== id) this.select(id)
+      this.inlineSession = { ...def.start({ el: fieldEl, node, field, ctrl: this }), id }
+      this.store.set({ inline: { id, field } })
+    } catch (e) {
+      this.fail(e)
+    }
+  }
+
+  stopInline() {
+    const s = this.inlineSession
+    if (!s) return
+    this.inlineSession = null
+    s.stop()
+    this.store.set({ inline: null })
+  }
+
+  // --- dialogs -----------------------------------------------------------------
+
+  private zCounter = 0
+  /**
+   * Open a dialog. With `id`, a second request for the same thing focuses the dialog that is already open
+   * (raised, pulsed, first field focused) instead of opening a duplicate; the existing key is returned.
+   */
+  openDialog(d: Omit<DialogInstance, 'key' | 'size' | 'z' | 'pulse'> & { size?: DialogInstance['size'] }): number {
+    const existing = d.id ? this.store.get().dialogs.find((x) => x.id === d.id) : undefined
+    if (existing) {
+      this.raiseDialog(existing.key, true)
+      return existing.key
+    }
+    const key = ++this.dialogKey
+    this.store.set((s) => ({ dialogs: [...s.dialogs, { size: 'md', ...d, key, z: ++this.zCounter, pulse: 0 }] }))
+    return key
+  }
+  /** Bring a dialog to the front; `pulse` also flashes it and moves focus into it. */
+  raiseDialog(key: number, pulse = false) {
+    this.store.set((s) => ({ dialogs: s.dialogs.map((x) => (x.key === key ? { ...x, z: ++this.zCounter, pulse: pulse ? x.pulse + 1 : x.pulse } : x)) }))
+  }
+  /** Focus the open dialog with this id (raise, pulse, focus its first field). False when none is open. */
+  focusDialog(id: string): boolean {
+    const d = this.store.get().dialogs.find((x) => x.id === id)
+    if (d) this.raiseDialog(d.key, true)
+    return !!d
+  }
+  closeDialog(key: number) {
+    this.store.set((s) => ({ dialogs: s.dialogs.filter((d) => d.key !== key) }))
+  }
+
+  /** Open a registered block editor for a node (loads node + schema first). */
+  private opening = new Set<string>()
+  /**
+   * Open a registered block editor for a node (loads node + schema first). One dialog per editor+node:
+   * asking again - even double-clicking before the first has loaded - focuses the existing one.
+   */
+  async openEditor(def: BlockEditorDef | string, id: string) {
+    const d = typeof def === 'string' ? blockEditors.get(def) : def
+    const info = this.block(id)
+    if (!d || !info) return
+    const dialogId = `editor:${d.id}:${id}`
+    if (this.focusDialog(dialogId)) return
+    if (this.opening.has(dialogId)) return
+    this.opening.add(dialogId)
+    try {
+      const [node, schema] = await Promise.all([this.node(id, true), this.node(id).then((n) => this.schema(n.dataType))])
+      const r = info.el.getBoundingClientRect()
+      let key = 0
+      key = this.openDialog({
+        id: dialogId,
+        title: `${d.label} · ${this.labelFor(id) ?? node.dataType}`,
+        size: d.size,
+        anchor: { x: r.right, y: r.top },
+        content: createElement(d.component, { info, node, schema, ctrl: this, close: () => this.closeDialog(key) }),
+      })
+    } catch (e) {
+      this.fail(e)
+    } finally {
+      this.opening.delete(dialogId)
+    }
+  }
+
+  // --- feedback ------------------------------------------------------------------
+
+  toast(kind: 'info' | 'error', text: string, action?: { label: string; run(): void }) {
+    this.store.set({ toast: { kind, text, n: ++this.toastN, action } })
+  }
+
+  private fail(e: unknown) {
+    const msg =
+      e instanceof EditError || e instanceof ApiError
+        ? e.status === 409
+          ? 'Someone else changed this node - reopen it and retry'
+          : e.status === 401 || e.status === 403
+            ? `Not allowed (${e.status}): ${e.message}`
+            : e.message
+        : e instanceof Error
+          ? e.message
+          : String(e)
+    this.toast('error', msg)
+    console.error('[cms-editor]', e)
+  }
+}
diff --git a/src/dev.ts b/src/dev.ts
new file mode 100644
index 0000000..f691452
--- /dev/null
+++ b/src/dev.ts
@@ -0,0 +1,29 @@
+// Dev entry, injected by the Vite plugin into every proxied/mock page.
+// Forces preview mode (the cookie makes the edge render /api/preview), opens the
+// dev panel and boots the editor from source so HMR works.
+import { Api } from './api'
+import { AuthManager } from './auth'
+import { boot } from './boot'
+import './examples'
+
+const hasCookie = () => /(?:^|;\s*)cms_preview=1/.test(document.cookie)
+
+if (!hasCookie()) {
+  document.cookie = 'cms_preview=1; path=/; SameSite=Lax'
+  // The first response was the published page; refetch in preview mode (once).
+  if (hasCookie() && !sessionStorage.getItem('cms-dev-reloaded')) {
+    sessionStorage.setItem('cms-dev-reloaded', '1')
+    location.reload()
+  }
+}
+sessionStorage.removeItem('cms-dev-reloaded')
+// Dev: refresh token in localStorage (go-auth's dev pattern), and tell the dev server the access token so
+// its server-side page fetches (live preview HTML) are authenticated as you, too. Never done in production.
+const auth = new AuthManager({
+  persistRefresh: true,
+  onTokens: (t) =>
+    void fetch('/__dev/token', t ? { method: 'POST', body: JSON.stringify({ accessToken: t.accessToken }) } : { method: 'DELETE' }).catch(() => {}),
+})
+auth.announce()
+const handle = boot({ dev: true, api: new Api({ auth }) })
+if (import.meta.hot) import.meta.hot.dispose(() => handle.destroy())
diff --git a/src/diff.ts b/src/diff.ts
new file mode 100644
index 0000000..d81e1e8
--- /dev/null
+++ b/src/diff.ts
@@ -0,0 +1,8 @@
+/** Build a `set` payload: changed keys carry the new value, removed keys are `null` (server deletes them). */
+export function diffData(original: Record<string, any>, draft: Record<string, any>): Record<string, unknown> {
+  const out: Record<string, unknown> = {}
+  const same = (a: unknown, b: unknown) => JSON.stringify(a) === JSON.stringify(b)
+  for (const k of Object.keys(draft)) if (!same(original[k], draft[k]) && draft[k] !== undefined) out[k] = draft[k]
+  for (const k of Object.keys(original)) if (!(k in draft) || draft[k] === undefined) out[k] = null
+  return out
+}
diff --git a/src/editors/AttrEditor.tsx b/src/editors/AttrEditor.tsx
new file mode 100644
index 0000000..ebe969e
--- /dev/null
+++ b/src/editors/AttrEditor.tsx
@@ -0,0 +1,37 @@
+import { useEffect, useRef, useState } from 'react'
+import type { Controller } from '../controller'
+import { Icon } from '../ui/Icon'
+
+const LABEL: Record<string, string> = { href: 'Link', src: 'Source', alt: 'Alt text', title: 'Title', placeholder: 'Placeholder', 'aria-label': 'Accessible label', value: 'Value' }
+
+/** Tiny editor for a property that is rendered as an attribute (href, src, alt…), opened from its chip. */
+export function AttrEditor({ id, path, attr, initial, ctrl, close }: { id: string; path: string; attr: string; initial: string; ctrl: Controller; close(): void }) {
+  const [v, setV] = useState(initial)
+  const input = useRef<HTMLInputElement>(null)
+  useEffect(() => input.current?.select(), [])
+  return (
+    <form
+      className="cms-form"
+      onSubmit={async (e) => {
+        e.preventDefault()
+        if (v !== initial) await ctrl.setPath(id, path, v)
+        close()
+      }}
+    >
+      <label className="cms-field">
+        <span className="cms-field__label">
+          {LABEL[attr] ?? attr} <span className="cms-muted">({path})</span>
+        </span>
+        <input ref={input} className="cms-input" value={v} onChange={(e) => setV(e.target.value)} />
+      </label>
+      <footer className="cms-actions">
+        <button type="button" className="cms-btn" onClick={close}>
+          Cancel
+        </button>
+        <button type="submit" className="cms-btn cms-btn--primary" disabled={v === initial}>
+          <Icon name="save" size={16} /> Save
+        </button>
+      </footer>
+    </form>
+  )
+}
diff --git a/src/editors/builtin.tsx b/src/editors/builtin.tsx
new file mode 100644
index 0000000..c459091
--- /dev/null
+++ b/src/editors/builtin.tsx
@@ -0,0 +1,253 @@
+// Built-in editors. They go through the same registries as third-party ones, so
+// replacing any of them is `registerEditor({ id: 'properties', ... })`.
+import { useEffect, useMemo, useRef, useState } from 'react'
+import { mountMarkdownEditor } from '@k6n/cms-editor'
+import { diffData } from '../diff'
+import { allowedChildren, sortGroups, typeName } from '../schema'
+import { useEditorState } from '../ui/hooks'
+import { getIn, parsePath } from '../page/infer'
+import type { Blueprint } from '../api'
+import type { Controller } from '../controller'
+import { registerEditor, registerInlineEditor } from '../registry'
+import { describeStyle } from '../style/model'
+import { StylePanel } from '../style/StylePanel'
+import type { EditorProps } from '../registry'
+import { SchemaForm, JsonArea, validate } from '../form/Form'
+import { Icon, TypeIcon } from '../ui/Icon'
+
+// --- Properties: schema-driven form with explicit Save ------------------------
+
+function Properties({ node, schema, ctrl, close }: EditorProps) {
+  const [draft, setDraft] = useState<Record<string, any>>(node.data ?? {})
+  const [saving, setSaving] = useState(false)
+  const patch = useMemo(() => diffData(node.data ?? {}, draft), [node, draft])
+  const form = useRef<HTMLFormElement>(null)
+  useEffect(() => void form.current?.querySelector<HTMLElement>('input:not([type=checkbox]), textarea, select')?.focus(), [])
+  const problems = useMemo(() => Object.entries(validate(schema, schema, draft)), [schema, draft])
+  const changed = Object.keys(patch).length > 0
+  const save = async () => {
+    setSaving(true)
+    const res = await ctrl.setData(node.id, patch, { version: node.version })
+    setSaving(false)
+    if (res) close()
+  }
+  return (
+    <form
+      ref={form}
+      className="cms-form"
+      onSubmit={(e) => {
+        e.preventDefault()
+        if (changed && !problems.length) void save()
+      }}
+    >
+      <SchemaForm schema={schema} value={draft} onChange={setDraft} node={node} ctrl={ctrl} />
+      <footer className="cms-actions">
+        <button type="button" className="cms-btn" onClick={() => setDraft(node.data ?? {})} disabled={!changed}>
+          <Icon name="reset" size={16} /> Reset
+        </button>
+        {problems.length > 0 && (
+          <span className="cms-error cms-actions__note" role="alert" title={problems.map(([p, m]) => `${p || 'form'}: ${m}`).join('\n')}>
+            {problems.length} problem{problems.length === 1 ? '' : 's'} to fix
+          </span>
+        )}
+        <button type="submit" className="cms-btn cms-btn--primary" disabled={!changed || saving || problems.length > 0}>
+          <Icon name="save" size={16} /> {saving ? 'Saving…' : 'Save'}
+        </button>
+      </footer>
+    </form>
+  )
+}
+
+// --- Raw JSON: escape hatch for anything the form can't express -----------------
+
+function RawJson({ node, ctrl, close }: EditorProps) {
+  const [draft, setDraft] = useState<any>(node.data ?? {})
+  const patch = diffData(node.data ?? {}, draft && typeof draft === 'object' ? draft : {})
+  return (
+    <div className="cms-form">
+      <JsonArea value={node.data ?? {}} onChange={setDraft} />
+      <footer className="cms-actions">
+        <button
+          className="cms-btn cms-btn--primary"
+          disabled={!Object.keys(patch).length}
+          onClick={async () => (await ctrl.setData(node.id, patch, { version: node.version })) && close()}
+        >
+          <Icon name="save" size={16} /> Save
+        </button>
+      </footer>
+    </div>
+  )
+}
+
+// --- Insert picker: children allowed by x-graph + blueprints ---------------------
+
+export function InsertPicker({ parentId, index, ctrl, close }: { parentId: string; index?: number; ctrl: Controller; close(): void }) {
+  const [state, setState] = useState<{ types: string[]; blueprints: Blueprint[] } | { error: string } | null>(null)
+  useEffect(() => {
+    let live = true
+    ;(async () => {
+      try {
+        const parent = await ctrl.node(parentId)
+        const [schema, all, blueprints] = await Promise.all([ctrl.schema(parent.dataType), ctrl.api.types(), ctrl.api.blueprints()])
+        const types = allowedChildren(schema, all.map(typeName)).filter((t) => !ctrl.isStaticRoot(t))
+        if (live) setState({ types, blueprints })
+        void ctrl.loadSchemas(types) // for grouping
+      } catch (e) {
+        if (live) setState({ error: (e as Error).message })
+      }
+    })()
+    return () => {
+      live = false
+    }
+  }, [parentId, ctrl])
+  useEditorState((st) => st.schemasVersion)
+  if (!state) return <p className="cms-muted">Loading…</p>
+  if ('error' in state) return <p className="cms-error">{state.error}</p>
+  if (!state.types.length && !state.blueprints.length) return <p className="cms-muted">This block does not accept children.</p>
+  const byGroup = new Map<string, string[]>()
+  for (const t of state.types) byGroup.set(ctrl.groupOfType(t), [...(byGroup.get(ctrl.groupOfType(t)) ?? []), t])
+  const tile = (t: string) => (
+    <button
+      key={t}
+      className="cms-tile"
+      data-type={t}
+      title={t}
+      onClick={async () => {
+        close()
+        await ctrl.insert(parentId, t, index !== undefined ? { index } : {})
+      }}
+    >
+      <TypeIcon type={t} size={20} />
+      <span>{ctrl.typeTitle(t)}</span>
+      {ctrl.typeTitle(t) !== t && <small>{t}</small>}
+    </button>
+  )
+  return (
+    <div className="cms-picker">
+      {sortGroups(byGroup.keys()).map((g) => (
+        <section key={g}>
+          <h4>{g}</h4>
+          <div className="cms-grid">{byGroup.get(g)!.map(tile)}</div>
+        </section>
+      ))}
+      {state.blueprints.length > 0 && <h4>Blueprints</h4>}
+      <div className="cms-grid">
+        {state.blueprints.map((b) => (
+          <button
+            key={b.id}
+            className="cms-tile"
+            title={b.description}
+            onClick={async () => {
+              close()
+              await ctrl.insertBlueprint(parentId, b.id, index)
+            }}
+          >
+            {b.name ?? b.id}
+          </button>
+        ))}
+      </div>
+    </div>
+  )
+}
+
+function AddChild({ info, ctrl, close }: EditorProps) {
+  return <InsertPicker parentId={info.id} ctrl={ctrl} close={close} />
+}
+
+function AddAfter({ info, ctrl, close }: EditorProps) {
+  const [target, setTarget] = useState<{ parent: string; index: number } | null>(null)
+  useEffect(() => {
+    void (async () => {
+      const parent = await ctrl.parentIdOf(info.id)
+      const { index } = await ctrl.position(info.id)
+      setTarget({ parent, index: index + 1 })
+    })().catch((e) => ctrl.toast('error', (e as Error).message))
+  }, [info.id, ctrl])
+  return target ? <InsertPicker parentId={target.parent} index={target.index} ctrl={ctrl} close={close} /> : <p className="cms-muted">Loading…</p>
+}
+
+export function registerBuiltins(): () => void {
+  const off = [
+    registerEditor({ id: 'properties', label: 'Properties', icon: 'edit', match: '*', priority: 100, onDoubleClick: true, component: Properties }),
+    // Matches on the schema, not the node type: any type with x-style fields gets spacing/layout controls.
+    registerEditor({ id: 'style', label: 'Style', icon: 'style', match: (i) => describeStyle(i.schema).length > 0, priority: 90, size: 'md', component: StylePanel }),
+    registerEditor({ id: 'add-child', label: 'Add inside', icon: 'add-inside', match: (i) => i.container, priority: 50, size: 'sm', component: AddChild }),
+    registerEditor({ id: 'add-after', label: 'Add after', icon: 'add', match: '*', priority: 40, size: 'sm', component: AddAfter }),
+    registerEditor({ id: 'raw-json', label: 'JSON', icon: 'json', placement: 'menu', match: '*', priority: -100, size: 'lg', component: RawJson }),
+    registerInlineEditor({ id: 'text', start: startPlainText }),
+    registerInlineEditor({ id: 'markdown', start: startMarkdown }),
+  ]
+  return () => off.forEach((f) => f())
+}
+
+// --- inline editors ------------------------------------------------------------
+
+import type { InlineEditorDef } from '../registry'
+
+const DEBOUNCE_MS = 350
+
+// `field` is a dotted path ("title", "links.0.text"): explicit template markers use plain names, inferred ones may be nested.
+const startPlainText: InlineEditorDef['start'] = ({ el, node, field, ctrl }) => {
+  const key = `inline:${node.id}:${field}`
+  const before = el.getAttribute('contenteditable')
+  el.setAttribute('contenteditable', 'plaintext-only')
+  if (el.contentEditable !== 'plaintext-only') el.setAttribute('contenteditable', 'true') // jsdom / old browsers
+  el.setAttribute('data-cms-editing', '')
+  el.focus()
+  try {
+    const sel = el.ownerDocument.defaultView!.getSelection()
+    const range = el.ownerDocument.createRange()
+    range.selectNodeContents(el)
+    sel?.removeAllRanges()
+    sel?.addRange(range) // select all: typing replaces, arrow keys place the caret
+  } catch {
+    /* no selection API */
+  }
+  let sent = el.textContent ?? ''
+  let timer: ReturnType<typeof setTimeout> | undefined
+  const flush = () => {
+    clearTimeout(timer)
+    const text = el.textContent ?? ''
+    if (text === sent) return
+    sent = text
+    void ctrl.setPath(node.id, field, text, { coalesce: key })
+  }
+  const onInput = () => {
+    clearTimeout(timer)
+    timer = setTimeout(flush, DEBOUNCE_MS)
+  }
+  const onKey = (e: KeyboardEvent) => {
+    if (e.key === 'Enter' && !el.hasAttribute('data-cms-multiline')) {
+      e.preventDefault()
+      ctrl.stopInline()
+    }
+  }
+  const onBlur = () => ctrl.stopInline()
+  el.addEventListener('input', onInput)
+  el.addEventListener('keydown', onKey)
+  el.addEventListener('blur', onBlur)
+  return {
+    stop() {
+      el.removeEventListener('input', onInput)
+      el.removeEventListener('keydown', onKey)
+      el.removeEventListener('blur', onBlur)
+      flush()
+      if (before === null) el.removeAttribute('contenteditable')
+      else el.setAttribute('contenteditable', before)
+      el.removeAttribute('data-cms-editing')
+    },
+  }
+}
+
+const startMarkdown: InlineEditorDef['start'] = ({ el, node, field, ctrl }) => {
+  const key = `inline:${node.id}:${field}`
+  const handle = mountMarkdownEditor({
+    element: el,
+    markdown: String(getIn(node.data, parsePath(field)) ?? ''),
+    editorClass: el.className,
+    onChange: (md) => void ctrl.setPath(node.id, field, md, { coalesce: key }),
+    onExit: () => ctrl.stopInline(),
+  })
+  handle.focus()
+  return { stop: () => handle.destroy() }
+}
diff --git a/src/examples.tsx b/src/examples.tsx
new file mode 100644
index 0000000..8858e44
--- /dev/null
+++ b/src/examples.tsx
@@ -0,0 +1,11 @@
+// Examples of the extension points, active in dev only (imported from dev.ts).
+// Copy one of these to add a real editor for a node type.
+import { registerEditor } from './registry'
+import type { EditorProps } from './registry'
+
+function Inspect({ node }: EditorProps) {
+  return <pre style={{ margin: 0, fontSize: 12 }}>{JSON.stringify(node, null, 2)}</pre>
+}
+
+// A toolbar button + dialog on every block - the smallest possible editor.
+registerEditor({ id: 'example-inspect', label: 'Inspect node', icon: 'inspect', placement: 'menu', match: '*', priority: -50, component: Inspect })
diff --git a/src/form/ArrayField.tsx b/src/form/ArrayField.tsx
new file mode 100644
index 0000000..7c47406
--- /dev/null
+++ b/src/form/ArrayField.tsx
@@ -0,0 +1,183 @@
+import { useRef, useState } from 'react'
+import type { JSONSchema } from '../api'
+import { Icon } from '../ui/Icon'
+import { useForm } from './context'
+import { JsonArea, Widget } from './Form'
+import { defaultFor, resolveSchema, variantsOf } from './resolve'
+
+let uid = 0
+const newKey = () => `k${++uid}`
+
+const plural = (n: number, w: string) => `${n} ${w}${n === 1 ? '' : 's'}`
+
+/** Short label for a collapsed object card: x-label, else the first useful string. */
+function summarise(root: JSONSchema, itemSchema: JSONSchema, item: unknown, index: number): string {
+  if (typeof item === 'string' || typeof item === 'number') return String(item)
+  if (item && typeof item === 'object') {
+    const o = item as Record<string, unknown>
+    const label = itemSchema['x-label'] ?? itemSchema['x-graph']?.label
+    const prefer = [label, 'title', 'name', 'label', 'text', 'heading', 'href', 'id'].filter(Boolean) as string[]
+    for (const k of prefer) if (typeof o[k] === 'string' && o[k]) return String(o[k]).slice(0, 48)
+    for (const v of Object.values(o)) if (typeof v === 'string' && v) return v.slice(0, 48)
+  }
+  return `Item ${index + 1}`
+}
+
+export function ArrayField({ schema: s, value, onChange, path }: { schema: JSONSchema; value: unknown; onChange(v: unknown): void; path: string }) {
+  const { root, errors } = useForm()
+  const items = Array.isArray(value) ? value : []
+  const it = resolveSchema(root, Array.isArray(s.items) ? undefined : s.items)
+  const itemSchema = it.schema
+
+  // Tuples / untyped arrays have no per-item form: raw JSON is the honest editor.
+  if (Array.isArray(s.items) || s.prefixItems) return <JsonArea value={value} onChange={onChange} />
+
+  // uniqueItems + enum items: a checkbox set (the natural UI for "pick several").
+  if (Array.isArray(itemSchema.enum) && s.uniqueItems) {
+    return (
+      <div className="cms-checks">
+        {itemSchema.enum.map((o: unknown) => (
+          <label key={String(o)} className="cms-inline">
+            <input
+              type="checkbox"
+              className="cms-check"
+              checked={items.includes(o)}
+              onChange={(e) => onChange(e.target.checked ? [...items, o] : items.filter((x) => x !== o))}
+            />{' '}
+            {String(o)}
+          </label>
+        ))}
+      </div>
+    )
+  }
+
+  const t = Array.isArray(itemSchema.type) ? itemSchema.type[0] : itemSchema.type
+  const variants = variantsOf(itemSchema)
+  const compound = t === 'object' || t === 'array' || (!t && !!itemSchema.properties) || !!variants?.some((v) => resolveSchema(root, v).schema.type === 'object')
+  return <ArrayList schema={s} itemSchema={itemSchema} items={items} onChange={onChange} path={path} compound={compound} err={errors[path]} />
+}
+
+function ArrayList({ schema: s, itemSchema, items, onChange, path, compound }: { schema: JSONSchema; itemSchema: JSONSchema; items: unknown[]; onChange(v: unknown): void; path: string; compound: boolean; err?: string }) {
+  const { root } = useForm()
+  // Stable keys survive reorders, so open/closed state and focus stay with the item.
+  const keys = useRef<string[]>([])
+  while (keys.current.length < items.length) keys.current.push(newKey())
+  if (keys.current.length > items.length) keys.current.length = items.length
+  const [open, setOpen] = useState<Record<string, boolean>>({})
+  const [dragFrom, setDragFrom] = useState<number | null>(null)
+  const [dragOver, setDragOver] = useState<number | null>(null)
+  const min = s.minItems ?? 0
+  const max = s.maxItems ?? Infinity
+  const isOpen = (k: string) => open[k] ?? items.length <= 2
+
+  const commit = (next: unknown[]) => onChange(next)
+  const move = (from: number, to: number) => {
+    if (to < 0 || to >= items.length || from === to) return
+    const next = [...items]
+    next.splice(to, 0, ...next.splice(from, 1))
+    keys.current.splice(to, 0, ...keys.current.splice(from, 1))
+    commit(next)
+  }
+  const remove = (i: number) => {
+    keys.current.splice(i, 1)
+    commit(items.filter((_, j) => j !== i))
+  }
+  const duplicate = (i: number) => {
+    const next = [...items]
+    next.splice(i + 1, 0, structuredClone(items[i]))
+    keys.current.splice(i + 1, 0, newKey())
+    commit(next)
+  }
+  const add = () => {
+    if (items.length >= max) return
+    const k = newKey()
+    keys.current.push(k)
+    setOpen((o) => ({ ...o, [k]: true }))
+    commit([...items, defaultFor(root, itemSchema)])
+  }
+
+  return (
+    <div className="cms-array" data-count={items.length}>
+      <ol className="cms-array__list">
+        {items.map((item, i) => {
+          const k = keys.current[i]
+          const expanded = !compound || isOpen(k)
+          return (
+            <li
+              key={k}
+              className={`cms-item${dragOver === i && dragFrom !== null && dragFrom !== i ? ' is-over' : ''}`}
+              onDragOver={(e) => {
+                if (dragFrom === null) return
+                e.preventDefault()
+                setDragOver(i)
+              }}
+              onDrop={(e) => {
+                e.preventDefault()
+                if (dragFrom !== null) move(dragFrom, i)
+                setDragFrom(null)
+                setDragOver(null)
+              }}
+            >
+              <div className="cms-item__head">
+                <span
+                  className="cms-grip"
+                  draggable
+                  title="Drag to reorder"
+                  aria-hidden="true"
+                  onDragStart={(e) => {
+                    e.dataTransfer.effectAllowed = 'move'
+                    e.dataTransfer.setData('text/plain', String(i))
+                    setDragFrom(i)
+                  }}
+                  onDragEnd={() => (setDragFrom(null), setDragOver(null))}
+                >
+                  <Icon name="grip" size={18} />
+                </span>
+                {compound ? (
+                  <button type="button" className="cms-item__title" aria-expanded={expanded} onClick={() => setOpen((o) => ({ ...o, [k]: !expanded }))}>
+                    <Icon name="chevron" size={16} className={`cms-chev${expanded ? ' is-open' : ''}`} /> {summarise(root, itemSchema, item, i)}
+                  </button>
+                ) : (
+                  <div className="cms-item__value">
+                    <Widget schema={itemSchema} value={item} onChange={(v) => commit(items.map((x, j) => (j === i ? (v === undefined ? defaultFor(root, itemSchema) : v) : x)))} path={`${path}.${i}`} required />
+                  </div>
+                )}
+                <span className="cms-item__actions">
+                  <button type="button" className="cms-ico" aria-label={`Move item ${i + 1} up`} title="Move up" disabled={i === 0} onClick={() => move(i, i - 1)}>
+                    <Icon name="up" size={16} />
+                  </button>
+                  <button type="button" className="cms-ico" aria-label={`Move item ${i + 1} down`} title="Move down" disabled={i === items.length - 1} onClick={() => move(i, i + 1)}>
+                    <Icon name="down" size={16} />
+                  </button>
+                  {compound && (
+                    <button type="button" className="cms-ico" aria-label={`Duplicate item ${i + 1}`} title="Duplicate" disabled={items.length >= max} onClick={() => duplicate(i)}>
+                      <Icon name="duplicate" size={16} />
+                    </button>
+                  )}
+                  <button type="button" className="cms-ico cms-ico--danger" aria-label={`Remove item ${i + 1}`} title="Remove" disabled={items.length <= min} onClick={() => remove(i)}>
+                    <Icon name="close" size={16} />
+                  </button>
+                </span>
+              </div>
+              {compound && expanded && (
+                <div className="cms-item__body">
+                  <Widget schema={itemSchema} value={item} onChange={(v) => commit(items.map((x, j) => (j === i ? (v ?? {}) : x)))} path={`${path}.${i}`} required bare />
+                </div>
+              )}
+            </li>
+          )
+        })}
+      </ol>
+      <div className="cms-array__foot">
+        <button type="button" className="cms-btn" aria-label="Add item" onClick={add} disabled={items.length >= max}>
+          <Icon name="add" size={16} /> Add {itemSchema.title?.toLowerCase() ?? 'item'}
+        </button>
+        <span className="cms-muted">
+          {plural(items.length, 'item')}
+          {s.minItems ? ` · min ${s.minItems}` : ''}
+          {s.maxItems ? ` · max ${s.maxItems}` : ''}
+        </span>
+      </div>
+    </div>
+  )
+}
diff --git a/src/form/Form.tsx b/src/form/Form.tsx
new file mode 100644
index 0000000..32431bd
--- /dev/null
+++ b/src/form/Form.tsx
@@ -0,0 +1,284 @@
+import { useMemo, useState } from 'react'
+import type { ReactNode } from 'react'
+import type { CmsNode, JSONSchema } from '../api'
+import type { Controller } from '../controller'
+import { fieldEditorFor } from '../registry'
+import { labelOf, READONLY_KEYS } from '../schema'
+import { Summary } from '../ui/Summary'
+import { ArrayField } from './ArrayField'
+import { FormContext, useForm } from './context'
+import { MapField } from './MapField'
+import { resolveSchema, variantsOf } from './resolve'
+import { validate } from './validate'
+import { VariantField } from './VariantField'
+
+export { validate } from './validate'
+export type { Errors } from './validate'
+
+interface FormProps {
+  schema: JSONSchema
+  value: Record<string, any>
+  onChange(v: Record<string, any>): void
+  node: CmsNode
+  ctrl: Controller
+}
+
+/** The whole properties form. Reports validity through `useFormErrors` callers via `validate()`. */
+export function SchemaForm({ schema, value, onChange, node, ctrl }: FormProps) {
+  const [advanced, setAdvanced] = useState(false)
+  const errors = useMemo(() => validate(schema, schema, value), [schema, value])
+  const hasAdvanced = useMemo(() => JSON.stringify(schema).includes('"x-advanced"'), [schema])
+  return (
+    <FormContext.Provider value={{ root: schema, node, ctrl, errors, advanced }}>
+      {hasAdvanced && (
+        <label className="cms-inline">
+          <input type="checkbox" className="cms-check" checked={advanced} onChange={(e) => setAdvanced(e.target.checked)} /> Show advanced fields
+        </label>
+      )}
+      <ObjectFields schema={resolveSchema(schema, schema).schema} value={value} onChange={(v) => onChange(v ?? {})} path="" />
+    </FormContext.Provider>
+  )
+}
+
+// --- containers ----------------------------------------------------------------
+
+const isPlainObject = (v: unknown): v is Record<string, unknown> => !!v && typeof v === 'object' && !Array.isArray(v)
+
+/** Should a cleared value remove its key (optional fields never round-trip as '' / [] / {})? */
+const dropsKey = (v: unknown) => v === undefined || v === '' || (Array.isArray(v) && v.length === 0) || (isPlainObject(v) && Object.keys(v).length === 0)
+
+export function ObjectFields({ schema: s, value, onChange, path }: { schema: JSONSchema; value: Record<string, any>; onChange(v: Record<string, any> | undefined): void; path: string }) {
+  const { root, advanced } = useForm()
+  const required = new Set<string>(s.required ?? [])
+  const entries = Object.entries<JSONSchema>(s.properties ?? {}).filter(([k, raw]) => {
+    if (READONLY_KEYS.has(k) && path === '') return false
+    const p = resolveSchema(root, raw).schema
+    if (p['x-editor'] === 'hidden') return false
+    if ('const' in p) return false // discriminators are set by the variant picker, not typed
+    if (!advanced && (p['x-advanced'] || p['x-graph']?.advanced)) return false
+    return true
+  })
+  const extra = Object.keys(value).filter((k) => !(k in (s.properties ?? {})) && !(path === '' && READONLY_KEYS.has(k)))
+  const set = (k: string, v: unknown) => {
+    const next = { ...value }
+    if (!required.has(k) && dropsKey(v)) delete next[k]
+    else next[k] = v
+    onChange(next)
+  }
+  const at = (k: string) => (path ? `${path}.${k}` : k)
+
+  // x-group: collapsible sections, in order of first appearance.
+  const meta = (s['x-groups'] ?? {}) as Record<string, { title?: string; description?: string; collapsedByDefault?: boolean; advancedOnly?: boolean }>
+  const sections: Array<{ group: string | null; items: Array<[string, JSONSchema]> }> = []
+  for (const e of entries) {
+    const g = resolveSchema(root, e[1]).schema['x-group'] as string | undefined
+    const existing = g ? sections.find((x) => x.group === g) : undefined
+    if (existing) existing.items.push(e)
+    else sections.push({ group: g ?? null, items: [e] })
+  }
+
+  const row = ([k, raw]: [string, JSONSchema]) => (
+    <FieldRow key={k} name={k} schema={raw} required={required.has(k)} path={at(k)}>
+      <Widget schema={raw} value={value[k]} onChange={(v) => set(k, v)} path={at(k)} required={required.has(k)} />
+    </FieldRow>
+  )
+  return (
+    <>
+      {sections.map((sec) =>
+        sec.group === null ? (
+          row(sec.items[0])
+        ) : meta[sec.group]?.advancedOnly && !advanced ? null : (
+          <details key={sec.group} className="cms-group" open={!(meta[sec.group]?.collapsedByDefault ?? true)}>
+            <Summary>
+              {meta[sec.group]?.title ?? labelOf(sec.group, {})} <span className="cms-muted">({sec.items.length})</span>
+            </Summary>
+            {meta[sec.group]?.description && <p className="cms-muted">{meta[sec.group]!.description}</p>}
+            {sec.items.map(row)}
+          </details>
+        ),
+      )}
+      {extra.length > 0 && (
+        <details className="cms-extra">
+          <Summary>{extra.length} field(s) not in the schema</Summary>
+          {extra.map((k) => (
+            <FieldRow key={k} name={k} schema={{}} path={at(k)} block>
+              <Widget schema={s.additionalProperties && typeof s.additionalProperties === 'object' ? s.additionalProperties : {}} value={value[k]} onChange={(v) => set(k, v)} path={at(k)} />
+            </FieldRow>
+          ))}
+        </details>
+      )}
+    </>
+  )
+}
+
+// --- field chrome ------------------------------------------------------------------
+
+/** Containers get a heading `div`; scalars get a wrapping `label` (click-to-focus). */
+export function isBlock(root: JSONSchema, raw: JSONSchema): boolean {
+  const s = resolveSchema(root, raw).schema
+  if (s['x-editor'] && ['json', 'dictionary'].includes(s['x-editor'])) return true
+  if (variantsOf(s)) return true
+  const t = Array.isArray(s.type) ? s.type[0] : s.type
+  return t === 'array' || t === 'object' || (!t && !!s.properties)
+}
+
+export function FieldRow({ name, schema, required, path, children, block }: { name: string; schema: JSONSchema; required?: boolean; path: string; children: ReactNode; block?: boolean }) {
+  const { root, errors } = useForm()
+  const { schema: s } = resolveSchema(root, schema)
+  const err = errors[path]
+  const Tag = block ?? isBlock(root, schema) ? 'div' : 'label'
+  return (
+    <Tag className={`cms-field${err ? ' has-error' : ''}`} data-path={path}>
+      <span className="cms-field__label">
+        {s.title ?? labelOf(name, s)}
+        {required && <b title="required"> *</b>}
+      </span>
+      {s.description && <span className="cms-field__hint">{s.description}</span>}
+      {children}
+      {err && (
+        <span className="cms-field__error" role="alert">
+          {err}
+        </span>
+      )}
+    </Tag>
+  )
+}
+
+// --- widget dispatch -----------------------------------------------------------------
+
+export interface WidgetProps {
+  schema: JSONSchema
+  value: unknown
+  onChange(v: unknown): void
+  path: string
+  required?: boolean
+  /** Object editors drop their own border (used inside array cards). */
+  bare?: boolean
+}
+
+export function Widget({ schema: raw, value, onChange, path, required, bare }: WidgetProps) {
+  const { root, node, ctrl } = useForm()
+  const { schema: s } = resolveSchema(root, raw)
+  const x = s['x-editor'] as string | undefined
+  if (x === 'hidden') return null
+
+  const Custom = fieldEditorFor(s, path, node)?.component
+  if (Custom) return <Custom schema={s} value={value} onChange={onChange} path={path} node={node} ctrl={ctrl} />
+
+  if (s.readOnly || x === 'readonly') return <ReadOnly value={value} />
+  if (variantsOf(s)) return <VariantField schema={s} value={value} onChange={onChange} path={path} />
+  if (x === 'json') return <JsonArea value={value} onChange={onChange} />
+
+  const t = Array.isArray(s.type) ? s.type.find((y: string) => y !== 'null') : s.type
+  if (s.enum) return <EnumSelect options={s.enum} value={value} onChange={onChange} required={required} />
+  if (t === 'array') return <ArrayField schema={s} value={value} onChange={onChange} path={path} />
+  if (t === 'object' || (!t && (s.properties || s.additionalProperties))) {
+    if (x === 'dictionary' || s['x-dict-keys'] || !s.properties) return <MapField schema={s} value={value} onChange={onChange} path={path} />
+    const obj = isPlainObject(value) ? value : {}
+    const fields = <ObjectFields schema={s} value={obj} onChange={(v) => onChange(v)} path={path} />
+    return bare ? <div className="cms-object">{fields}</div> : <fieldset className="cms-nested">{fields}</fieldset>
+  }
+  if (t === 'boolean') return <input type="checkbox" className="cms-check" checked={!!value} onChange={(e) => onChange(e.target.checked)} />
+  if (t === 'integer' || t === 'number') return <NumberInput schema={s} value={value} onChange={onChange} />
+  if (t === 'string') return <StringInput schema={s} value={value} onChange={onChange} />
+  // Untyped ("any"): decide by what is actually stored.
+  switch (typeof value) {
+    case 'string':
+      return <StringInput schema={s} value={value} onChange={onChange} />
+    case 'number':
+      return <NumberInput schema={s} value={value} onChange={onChange} />
+    case 'boolean':
+      return <input type="checkbox" className="cms-check" checked={value} onChange={(e) => onChange(e.target.checked)} />
+    case 'undefined':
+      return <StringInput schema={s} value={value} onChange={onChange} />
+    default:
+      return <JsonArea value={value} onChange={onChange} />
+  }
+}
+
+// --- scalar inputs ----------------------------------------------------------------------
+
+const looksLikeImage = (v: unknown) => typeof v === 'string' && /\.(jpe?g|gif|png|webp|svg|avif)(\?|$)/i.test(v)
+
+export function StringInput({ schema: s, value, onChange }: { schema: JSONSchema; value: unknown; onChange(v: unknown): void }) {
+  const x = s['x-editor'] as string | undefined
+  const text = typeof value === 'string' ? value : value == null ? '' : String(value)
+  if (x && ['textarea', 'markdown', 'monaco', 'html', 'richtext'].includes(x) || (s.maxLength ?? 0) > 200) {
+    const mono = x === 'monaco' || x === 'html'
+    return <textarea className={`cms-input cms-input--area${mono ? ' cms-mono' : ''}`} rows={x === 'markdown' || x === 'richtext' ? 8 : 5} value={text} onChange={(e) => onChange(e.target.value)} spellCheck={!mono} />
+  }
+  const type = ({ email: 'email', uri: 'url', url: 'url', date: 'date', time: 'time' } as Record<string, string>)[s.format] ?? 'text'
+  return (
+    <>
+      <input className={`cms-input${x === 'node' ? ' cms-mono' : ''}`} type={type} value={text} placeholder={x === 'node' ? 'node id' : s.default ?? s.examples?.[0] ?? ''} onChange={(e) => onChange(e.target.value)} />
+      {x === 'asset' && looksLikeImage(text) && <img className="cms-thumb" src={text} alt="" />}
+    </>
+  )
+}
+
+export function NumberInput({ schema: s, value, onChange }: { schema: JSONSchema; value: unknown; onChange(v: unknown): void }) {
+  return (
+    <input
+      className="cms-input"
+      type="number"
+      value={typeof value === 'number' ? value : ''}
+      min={s.minimum}
+      max={s.maximum}
+      step={s.type === 'integer' ? 1 : (s.multipleOf ?? 'any')}
+      onChange={(e) => onChange(e.target.value === '' ? undefined : Number(e.target.value))}
+    />
+  )
+}
+
+export function EnumSelect({ options, value, onChange, required }: { options: unknown[]; value: unknown; onChange(v: unknown): void; required?: boolean }) {
+  const known = options.some((o) => o === value)
+  return (
+    <select
+      className="cms-input"
+      value={value === undefined || value === null ? '' : String(value)}
+      onChange={(e) => onChange(e.target.value === '' ? undefined : (options.find((o) => String(o) === e.target.value) ?? e.target.value))}
+    >
+      {!required || value === undefined ? <option value="">—</option> : null}
+      {!known && value !== undefined && value !== null && <option value={String(value)}>{String(value)} (not in schema)</option>}
+      {options.map((o) => (
+        <option key={String(o)} value={String(o)}>
+          {String(o)}
+        </option>
+      ))}
+    </select>
+  )
+}
+
+export function ReadOnly({ value }: { value: unknown }) {
+  return <pre className="cms-readonly">{typeof value === 'string' ? value : JSON.stringify(value, null, 2) ?? '—'}</pre>
+}
+
+/** Free-form JSON. Keeps invalid text locally until it parses; a parse error is shown, never lost. */
+export function JsonArea({ value, onChange }: { value: unknown; onChange(v: unknown): void }) {
+  const [text, setText] = useState(() => (value === undefined ? '' : JSON.stringify(value, null, 2)))
+  const [bad, setBad] = useState<string | null>(null)
+  return (
+    <>
+      <textarea
+        className={`cms-input cms-input--area cms-mono${bad ? ' cms-input--bad' : ''}`}
+        rows={5}
+        value={text}
+        spellCheck={false}
+        onChange={(e) => {
+          setText(e.target.value)
+          if (e.target.value.trim() === '') {
+            setBad(null)
+            return onChange(undefined)
+          }
+          try {
+            onChange(JSON.parse(e.target.value))
+            setBad(null)
+          } catch (err) {
+            setBad((err as Error).message)
+          }
+        }}
+      />
+      {bad && <span className="cms-field__error">Invalid JSON: {bad}</span>}
+    </>
+  )
+}
diff --git a/src/form/MapField.tsx b/src/form/MapField.tsx
new file mode 100644
index 0000000..372610f
--- /dev/null
+++ b/src/form/MapField.tsx
@@ -0,0 +1,118 @@
+import { useState } from 'react'
+import type { JSONSchema } from '../api'
+import { Icon } from '../ui/Icon'
+import { useForm } from './context'
+import { Widget } from './Form'
+import { defaultFor, resolveSchema } from './resolve'
+
+const isObj = (v: unknown): v is Record<string, unknown> => !!v && typeof v === 'object' && !Array.isArray(v)
+
+/**
+ * Key → value editor: `additionalProperties` schemas, `x-editor: dictionary`, objects without a
+ * declared shape. With `x-dict-keys` the keys are a fixed vocabulary (one row each, blank removes);
+ * otherwise keys are free-form (rename, add, remove).
+ */
+export function MapField({ schema: s, value, onChange, path }: { schema: JSONSchema; value: unknown; onChange(v: unknown): void; path: string }) {
+  const { root } = useForm()
+  const obj = isObj(value) ? value : {}
+  const ap = s.additionalProperties
+  const valueSchema: JSONSchema = ap && typeof ap === 'object' ? ap : {}
+  const fixed = Array.isArray(s['x-dict-keys']) ? (s['x-dict-keys'] as string[]) : null
+  const [draftKey, setDraftKey] = useState('')
+  const [dupe, setDupe] = useState(false)
+
+  const setVal = (k: string, v: unknown) => {
+    const next = { ...obj }
+    if (fixed && (v === undefined || v === '')) delete next[k]
+    else next[k] = v === undefined ? defaultFor(root, valueSchema) : v
+    onChange(next)
+  }
+
+  if (fixed) {
+    const rest = Object.keys(obj).filter((k) => !fixed.includes(k))
+    return (
+      <div className="cms-map">
+        {[...fixed, ...rest].map((k) => (
+          <div key={k} className="cms-map__row">
+            <span className="cms-map__key">{k}</span>
+            <div className="cms-map__value">
+              <Widget schema={valueSchema} value={obj[k]} onChange={(v) => setVal(k, v)} path={`${path}.${k}`} />
+            </div>
+            {k in obj && (
+              <button type="button" className="cms-ico cms-ico--danger" aria-label={`Clear ${k}`} onClick={() => setVal(k, undefined)}>
+                <Icon name="close" size={16} />
+              </button>
+            )}
+          </div>
+        ))}
+      </div>
+    )
+  }
+
+  const rename = (from: string, to: string) => {
+    to = to.trim()
+    if (!to || to === from) return false
+    if (to in obj) return setDupe(true), false
+    // Rebuild to keep the row's position.
+    onChange(Object.fromEntries(Object.entries(obj).map(([k, v]) => [k === from ? to : k, v])))
+    return true
+  }
+  const add = () => {
+    const k = draftKey.trim()
+    if (!k) return
+    if (k in obj) return setDupe(true)
+    onChange({ ...obj, [k]: defaultFor(root, valueSchema) })
+    setDraftKey('')
+    setDupe(false)
+  }
+
+  return (
+    <div className="cms-map">
+      {Object.entries(obj).map(([k, v]) => (
+        <div key={k} className="cms-map__row">
+          <KeyInput name={k} onCommit={(to) => rename(k, to)} />
+          <div className="cms-map__value">
+            <Widget schema={valueSchema} value={v} onChange={(nv) => setVal(k, nv)} path={`${path}.${k}`} required />
+          </div>
+          <button
+            type="button"
+            className="cms-ico cms-ico--danger"
+            aria-label={`Remove ${k}`}
+            onClick={() => {
+              const { [k]: _gone, ...rest } = obj
+              onChange(rest)
+            }}
+          >
+            <Icon name="close" size={16} />
+          </button>
+        </div>
+      ))}
+      <div className="cms-map__add">
+        <input
+          className={`cms-input${dupe ? ' cms-input--bad' : ''}`}
+          placeholder="new key"
+          aria-label="New key"
+          value={draftKey}
+          onChange={(e) => (setDraftKey(e.target.value), setDupe(false))}
+          onKeyDown={(e) => e.key === 'Enter' && (e.preventDefault(), add())}
+        />
+        <button type="button" className="cms-btn" aria-label="Add entry" onClick={add} disabled={!draftKey.trim()}>
+          <Icon name="add" size={16} /> Add
+        </button>
+      </div>
+      {dupe && <span className="cms-field__error">That key already exists</span>}
+    </div>
+  )
+}
+
+/** Key text is local until blur/Enter: renaming rebuilds the object, which would otherwise steal focus per keystroke. */
+function KeyInput({ name, onCommit }: { name: string; onCommit(to: string): boolean }) {
+  const [text, setText] = useState(name)
+  const [seen, setSeen] = useState(name)
+  if (seen !== name) {
+    setSeen(name)
+    setText(name)
+  }
+  const commit = () => (onCommit(text) ? undefined : setText(name))
+  return <input className="cms-input cms-map__key cms-mono" aria-label={`Key ${name}`} value={text} onChange={(e) => setText(e.target.value)} onBlur={commit} onKeyDown={(e) => e.key === 'Enter' && (e.preventDefault(), commit())} />
+}
diff --git a/src/form/VariantField.tsx b/src/form/VariantField.tsx
new file mode 100644
index 0000000..961815b
--- /dev/null
+++ b/src/form/VariantField.tsx
@@ -0,0 +1,33 @@
+import type { JSONSchema } from '../api'
+import { useForm } from './context'
+import { Widget } from './Form'
+import { defaultFor, discriminators, pickVariant, resolveSchema, variantLabel, variantsOf } from './resolve'
+
+/** oneOf / anyOf: choose a branch, then edit it with that branch's own form. */
+export function VariantField({ schema: s, value, onChange, path }: { schema: JSONSchema; value: unknown; onChange(v: unknown): void; path: string }) {
+  const { root } = useForm()
+  const branches = variantsOf(s) ?? []
+  const current = pickVariant(root, branches, value)
+  const choose = (i: number) => {
+    if (i < 0) return onChange(undefined)
+    const b = branches[i]
+    const base = defaultFor(root, b)
+    const consts = discriminators(root, b)
+    // Keep what the old branch and the new one share, so switching does not wipe the user's input.
+    const carried = value && typeof value === 'object' && base && typeof base === 'object' ? Object.fromEntries(Object.entries(value as object).filter(([k]) => k in (resolveSchema(root, b).schema.properties ?? {}))) : {}
+    onChange(base && typeof base === 'object' && !Array.isArray(base) ? { ...base, ...carried, ...consts } : base)
+  }
+  return (
+    <div className="cms-variant">
+      <select className="cms-input" aria-label="Variant" value={current} onChange={(e) => choose(Number(e.target.value))}>
+        <option value={-1}>Choose…</option>
+        {branches.map((b, i) => (
+          <option key={i} value={i}>
+            {variantLabel(root, b, i)}
+          </option>
+        ))}
+      </select>
+      {current >= 0 && <Widget schema={{ ...branches[current] }} value={value} onChange={onChange} path={path} required bare />}
+    </div>
+  )
+}
diff --git a/src/form/context.ts b/src/form/context.ts
new file mode 100644
index 0000000..1edf91a
--- /dev/null
+++ b/src/form/context.ts
@@ -0,0 +1,14 @@
+import { createContext, useContext } from 'react'
+import type { CmsNode, JSONSchema } from '../api'
+import type { Controller } from '../controller'
+import type { Errors } from './validate'
+
+export interface FormCtx {
+  root: JSONSchema
+  node: CmsNode
+  ctrl: Controller
+  errors: Errors
+  advanced: boolean
+}
+export const FormContext = createContext<FormCtx>(null as never)
+export const useForm = () => useContext(FormContext)
diff --git a/src/form/resolve.ts b/src/form/resolve.ts
new file mode 100644
index 0000000..29b5f46
--- /dev/null
+++ b/src/form/resolve.ts
@@ -0,0 +1,152 @@
+// Schema normalisation for the form: $ref, allOf, nullable unions and
+// oneOf/anyOf variants. Everything the widgets need to know about "what is this
+// field" is decided here, so widgets stay dumb.
+import type { JSONSchema } from '../api'
+
+export interface Resolved {
+  schema: JSONSchema
+  /** `type: [x, 'null']` or `anyOf: [x, {type:'null'}]` */
+  nullable: boolean
+}
+
+const isNullBranch = (s: JSONSchema) => s?.type === 'null' || (s?.enum?.length === 1 && s.enum[0] === null)
+
+function lookup(root: JSONSchema, ref: string): JSONSchema | undefined {
+  if (!ref.startsWith('#')) return undefined // remote refs are not fetched
+  let t: any = root
+  for (const part of ref.replace(/^#\/?/, '').split('/').filter(Boolean)) t = t?.[decodeURIComponent(part.replace(/~1/g, '/').replace(/~0/g, '~'))]
+  return t
+}
+
+/** Merge allOf branches into one schema (properties/required are combined, later wins elsewhere). */
+function mergeAllOf(root: JSONSchema, s: JSONSchema, depth: number): JSONSchema {
+  if (!s.allOf) return s
+  const { allOf, ...rest } = s
+  let out: JSONSchema = { ...rest }
+  for (const part of allOf as JSONSchema[]) {
+    const p = resolveSchema(root, part, depth + 1).schema
+    out = {
+      ...out,
+      ...p,
+      properties: { ...(out.properties ?? {}), ...(p.properties ?? {}) },
+      required: [...new Set([...(out.required ?? []), ...(p.required ?? [])])],
+    }
+    if (!Object.keys(out.properties).length) delete out.properties
+    if (!out.required.length) delete out.required
+  }
+  return out
+}
+
+export function resolveSchema(root: JSONSchema, s: JSONSchema | undefined | boolean, depth = 0): Resolved {
+  if (!s || s === true || depth > 12) return { schema: {}, nullable: false }
+  let cur: JSONSchema = s
+  let nullable = false
+  for (let i = 0; i < 12 && typeof cur.$ref === 'string'; i++) {
+    const { $ref, ...siblings } = cur
+    cur = { ...(lookup(root, $ref) ?? {}), ...siblings }
+  }
+  cur = mergeAllOf(root, cur, depth)
+  if (Array.isArray(cur.type) && cur.type.includes('null')) {
+    nullable = true
+    const rest = cur.type.filter((t: string) => t !== 'null')
+    cur = { ...cur, type: rest.length === 1 ? rest[0] : rest }
+  }
+  for (const key of ['anyOf', 'oneOf'] as const) {
+    const branches = cur[key] as JSONSchema[] | undefined
+    if (!branches) continue
+    const real = branches.filter((b) => !isNullBranch(resolveSchema(root, b, depth + 1).schema))
+    if (real.length !== branches.length) nullable = true
+    if (real.length === 1) {
+      const { [key]: _drop, ...rest } = cur
+      const inner = resolveSchema(root, { ...rest, ...real[0] }, depth + 1)
+      return { schema: inner.schema, nullable: nullable || inner.nullable }
+    }
+    if (real.length !== branches.length) cur = { ...cur, [key]: real }
+  }
+  return { schema: cur, nullable }
+}
+
+export const variantsOf = (s: JSONSchema): JSONSchema[] | undefined => (s.oneOf ?? s.anyOf) as JSONSchema[] | undefined
+
+/** Const / single-value-enum properties of an object branch: its discriminator(s). */
+export function discriminators(root: JSONSchema, branch: JSONSchema): Record<string, unknown> {
+  const b = resolveSchema(root, branch).schema
+  const out: Record<string, unknown> = {}
+  for (const [k, raw] of Object.entries<JSONSchema>(b.properties ?? {})) {
+    const p = resolveSchema(root, raw).schema
+    if ('const' in p) out[k] = p.const
+    else if (Array.isArray(p.enum) && p.enum.length === 1) out[k] = p.enum[0]
+  }
+  return out
+}
+
+const typeOf = (v: unknown) => (v === null ? 'null' : Array.isArray(v) ? 'array' : typeof v === 'number' && Number.isInteger(v) ? 'integer' : typeof v)
+
+/** Which branch of a oneOf/anyOf does `value` belong to? -1 when undecidable (e.g. no value). */
+export function pickVariant(root: JSONSchema, branches: JSONSchema[], value: unknown): number {
+  if (value === undefined || value === null) return -1
+  const scored = branches.map((raw, i) => {
+    const b = resolveSchema(root, raw).schema
+    const t = typeOf(value)
+    const bt = Array.isArray(b.type) ? b.type : b.type ? [b.type] : []
+    let score = 0
+    if (bt.length && !(bt.includes(t) || (t === 'integer' && bt.includes('number')))) return { i, score: -1 }
+    if (bt.length) score += 1
+    if (t === 'object') {
+      const d = discriminators(root, b)
+      for (const [k, v] of Object.entries(d)) score += (value as any)[k] === v ? 10 : -10
+      for (const k of b.required ?? []) score += k in (value as object) ? 1 : -1
+    }
+    if (Array.isArray(b.enum)) score += b.enum.includes(value) ? 5 : -5
+    if ('const' in b) score += b.const === value ? 5 : -5
+    return { i, score }
+  })
+  const best = scored.sort((a, b) => b.score - a.score)[0]
+  return best && best.score >= 0 ? best.i : -1
+}
+
+export function variantLabel(root: JSONSchema, raw: JSONSchema, i: number): string {
+  const b = resolveSchema(root, raw).schema
+  if (b.title) return b.title
+  const d = Object.values(discriminators(root, b))
+  if (d.length) return d.map(String).join(' / ')
+  if ('const' in b) return String(b.const)
+  return typeof b.type === 'string' ? `${b.type} ${i + 1}` : `Option ${i + 1}`
+}
+
+/** A sensible starting value for a new array item / newly chosen variant. */
+export function defaultFor(root: JSONSchema, raw: JSONSchema | undefined, depth = 0): unknown {
+  const { schema: s } = resolveSchema(root, raw)
+  if (s.default !== undefined) return structuredClone(s.default)
+  if ('const' in s) return s.const
+  if (Array.isArray(s.enum)) return s.enum[0]
+  const variants = variantsOf(s)
+  if (variants?.length && depth < 6) return defaultFor(root, variants[0], depth + 1)
+  const t = Array.isArray(s.type) ? s.type[0] : s.type
+  switch (t) {
+    case 'string':
+      return ''
+    case 'integer':
+    case 'number':
+      return s.minimum ?? 0
+    case 'boolean':
+      return false
+    case 'array':
+      return []
+    case 'object':
+    default: {
+      if (t !== 'object' && !s.properties) return ''
+      const out: Record<string, unknown> = {}
+      if (depth < 6) {
+        for (const k of s.required ?? []) {
+          const v = defaultFor(root, s.properties?.[k], depth + 1)
+          if (v !== undefined) out[k] = v
+        }
+        for (const [k, p] of Object.entries<JSONSchema>(s.properties ?? {})) {
+          if (!(k in out) && (resolveSchema(root, p).schema as JSONSchema).const !== undefined) out[k] = defaultFor(root, p, depth + 1)
+        }
+      }
+      return out
+    }
+  }
+}
diff --git a/src/form/validate.ts b/src/form/validate.ts
new file mode 100644
index 0000000..b199078
--- /dev/null
+++ b/src/form/validate.ts
@@ -0,0 +1,56 @@
+// Client-side validation: early feedback only. The server's schema validation
+// stays authoritative (400 on /api/edit), this just stops obvious mistakes and
+// powers the inline messages / disabled Save. Keys are form paths (`links.0.text`).
+import type { JSONSchema } from '../api'
+import { pickVariant, resolveSchema, variantsOf } from './resolve'
+
+export type Errors = Record<string, string>
+
+const empty = (v: unknown) => v === undefined || v === null || v === ''
+
+export function validate(root: JSONSchema, rawSchema: JSONSchema, value: unknown, path = '', errors: Errors = {}, depth = 0): Errors {
+  if (depth > 20) return errors
+  const { schema: s } = resolveSchema(root, rawSchema)
+  if (s['x-editor'] === 'hidden' || s['x-editor'] === 'readonly' || s.readOnly) return errors
+  const at = (msg: string) => void (errors[path] ??= msg)
+  if (value === undefined || value === null) return errors
+
+  const variants = variantsOf(s)
+  if (variants) {
+    const i = pickVariant(root, variants, value)
+    if (i >= 0) validate(root, variants[i], value, path, errors, depth + 1)
+    return errors
+  }
+  if (typeof value === 'string') {
+    if (s.minLength !== undefined && value.length < s.minLength && value !== '') at(`At least ${s.minLength} characters`)
+    if (s.maxLength !== undefined && value.length > s.maxLength) at(`At most ${s.maxLength} characters`)
+    if (s.pattern) {
+      try {
+        if (value !== '' && !new RegExp(s.pattern).test(value)) at(s['x-pattern-message'] ?? `Must match ${s.pattern}`)
+      } catch {
+        /* bad pattern in schema: ignore */
+      }
+    }
+    if (s.format === 'email' && value !== '' && !/^[^@\s]+@[^@\s]+\.[^@\s]+$/.test(value)) at('Not a valid email address')
+  } else if (typeof value === 'number') {
+    if (s.minimum !== undefined && value < s.minimum) at(`Must be at least ${s.minimum}`)
+    if (s.maximum !== undefined && value > s.maximum) at(`Must be at most ${s.maximum}`)
+    if (s.type === 'integer' && !Number.isInteger(value)) at('Must be a whole number')
+  } else if (Array.isArray(value)) {
+    if (s.minItems !== undefined && value.length < s.minItems) at(`Add at least ${s.minItems} item${s.minItems === 1 ? '' : 's'}`)
+    if (s.maxItems !== undefined && value.length > s.maxItems) at(`At most ${s.maxItems} items`)
+    value.forEach((it, i) => validate(root, s.items ?? {}, it, path ? `${path}.${i}` : String(i), errors, depth + 1))
+  } else if (typeof value === 'object') {
+    const obj = value as Record<string, unknown>
+    for (const k of s.required ?? []) {
+      const p = resolveSchema(root, s.properties?.[k]).schema
+      if (empty(obj[k]) && !p.readOnly && p['x-editor'] !== 'hidden') errors[path ? `${path}.${k}` : k] ??= 'Required'
+    }
+    for (const [k, p] of Object.entries<JSONSchema>(s.properties ?? {})) validate(root, p, obj[k], path ? `${path}.${k}` : k, errors, depth + 1)
+    const ap = s.additionalProperties
+    if (ap && typeof ap === 'object') {
+      for (const [k, v] of Object.entries(obj)) if (!(k in (s.properties ?? {}))) validate(root, ap, v, path ? `${path}.${k}` : k, errors, depth + 1)
+    }
+  }
+  return errors
+}
diff --git a/src/main.ts b/src/main.ts
new file mode 100644
index 0000000..76b010f
--- /dev/null
+++ b/src/main.ts
@@ -0,0 +1,11 @@
+// Production entry: served as /editor/onpage-editor.js and loaded by the page's
+// own loader only when the preview cookie is set (docs/onpage-editor.md §2).
+// It re-checks, so loading it by mistake never shows editor UI to visitors.
+import { boot } from './boot'
+
+export const previewEnabled = () => /(?:^|;\s*)cms_preview=1/.test(document.cookie)
+
+if (previewEnabled()) boot()
+
+export { boot }
+export * from './registry'
diff --git a/src/page-style.css b/src/page-style.css
new file mode 100644
index 0000000..608f89b
--- /dev/null
+++ b/src/page-style.css
@@ -0,0 +1,10 @@
+/* Injected into the PAGE (not the shadow root): affordances for editing. */
+html[data-cms-editing="edit"] [data-cms-field][data-cms-editor]:not([contenteditable]) { cursor: text; }
+html[data-cms-editing="edit"] [data-cms] { cursor: default; }
+[data-cms-field][contenteditable], [data-cms-field] .ProseMirror { outline: none; }
+html[data-cms-editing="edit"] a { cursor: default; }
+html[data-cms-dragging], html[data-cms-dragging] * { user-select: none !important; cursor: grabbing !important; }
+
+/* every editable text field: a hint on hover (inferred ones only exist on the selected block) */
+html[data-cms-editing="edit"] [data-cms-field][data-cms-editor]:not([contenteditable]):hover { outline: 1px dashed rgba(94,224,160,.9); outline-offset: 3px; }
+html[data-cms-editing="edit"] [data-cms-inferred]:not([contenteditable]) { outline: 1px dotted rgba(94,224,160,.45); outline-offset: 3px; }
diff --git a/src/page/dnd.ts b/src/page/dnd.ts
new file mode 100644
index 0000000..fa837b3
--- /dev/null
+++ b/src/page/dnd.ts
@@ -0,0 +1,139 @@
+// Drop-target maths for drag & drop. Pure (rects in, target out) so it is testable without layout.
+//  - sortTarget / moveTarget: reordering an existing block snaps between its siblings (vertical stacks and
+//    horizontal rows; grids are treated as vertical).
+//  - dropTarget: "drop into whatever container is under the pointer", used for new blocks from the palette,
+//    for Alt-nesting, and when a block is dragged out of its parent.
+export interface Rect {
+  x: number
+  y: number
+  w: number
+  h: number
+}
+export interface DndBlock {
+  id: string
+  parentId?: string
+  container: boolean
+  depth: number
+  rect: Rect
+}
+export interface DropTarget {
+  /** Container id, or '' for the page root. */
+  parentId: string
+  /** Index among the parent's children *excluding* the dragged block. */
+  index: number
+  /** Where to draw the insertion line (viewport coordinates). */
+  line: Rect
+  /** Sort mode: every candidate position between the siblings (the active one is `line`), to draw snap markers. */
+  snaps?: Rect[]
+}
+
+const inside = (r: Rect, p: { x: number; y: number }) => p.x >= r.x && p.x <= r.x + r.w && p.y >= r.y && p.y <= r.y + r.h
+
+function descendantOf(blocks: DndBlock[], id: string, ancestor: string): boolean {
+  const byId = new Map(blocks.map((b) => [b.id, b]))
+  for (let cur = byId.get(id), n = 0; cur && n < 100; cur = cur.parentId ? byId.get(cur.parentId) : undefined, n++) {
+    if (cur.id === ancestor) return true
+  }
+  return false
+}
+
+export function dropTarget(blocks: DndBlock[], point: { x: number; y: number }, dragId: string | null, accepts?: (parentId: string) => boolean): DropTarget | null {
+  // Deepest container under the pointer that is not the dragged block or inside it.
+  const hit = blocks
+    .filter((b) => b.container && inside(b.rect, point) && !(dragId && descendantOf(blocks, b.id, dragId)) && (!accepts || accepts(b.id)))
+    .sort((a, b) => b.depth - a.depth)[0]
+  let parentId = hit?.id ?? ''
+  if (!hit) {
+    // Page level: only when the pointer is within the vertical extent of the top-level blocks.
+    const top = blocks.filter((b) => !b.parentId)
+    if (!top.length) return null
+    const y0 = Math.min(...top.map((b) => b.rect.y)) - 24
+    const y1 = Math.max(...top.map((b) => b.rect.y + b.rect.h)) + 24
+    const x0 = Math.min(...top.map((b) => b.rect.x)) - 24
+    const x1 = Math.max(...top.map((b) => b.rect.x + b.rect.w)) + 24
+    if (point.y < y0 || point.y > y1 || point.x < x0 || point.x > x1) return null // e.g. over the editor's own panels
+    parentId = ''
+  }
+  const kids = blocks.filter((b) => (b.parentId ?? '') === parentId && b.id !== dragId)
+  let index = kids.length
+  for (let i = 0; i < kids.length; i++) {
+    if (point.y < kids[i].rect.y + kids[i].rect.h / 2) {
+      index = i
+      break
+    }
+  }
+  const container = hit?.rect
+  let line: Rect
+  if (kids.length === 0) {
+    line = container ? { x: container.x + 8, y: container.y + 8, w: container.w - 16, h: 3 } : { x: 0, y: point.y, w: 0, h: 3 }
+  } else if (index < kids.length) {
+    const r = kids[index].rect
+    line = { x: r.x, y: r.y - 2, w: r.w, h: 3 }
+  } else {
+    const r = kids[kids.length - 1].rect
+    line = { x: r.x, y: r.y + r.h - 1, w: r.w, h: 3 }
+  }
+  return { parentId, index, line }
+}
+
+// --- sort mode: snap between siblings ---------------------------------------------------------------
+
+/** Are the siblings laid out left-to-right (a row) rather than top-to-bottom? Grids count as vertical. */
+function isRow(kids: Rect[]): boolean {
+  if (kids.length < 2) return false
+  return kids.every((k, i) => i === 0 || (k.x >= kids[i - 1].x + kids[i - 1].w - 1 && Math.min(k.y + k.h, kids[i - 1].y + kids[i - 1].h) - Math.max(k.y, kids[i - 1].y) > 0))
+}
+
+/**
+ * Reorder among the siblings of one parent: the target SNAPS to the nearest boundary between them
+ * (before the first, in each gap, after the last), however deep in a sibling the pointer is. That is what
+ * makes sorting root nodes (usually big containers) work: the pointer being "inside" a section no longer
+ * nests the block into it. `index` counts the siblings without the dragged block.
+ */
+export function sortTarget(blocks: DndBlock[], point: { x: number; y: number }, dragId: string | null, parentId: string): DropTarget | null {
+  const siblings = blocks.filter((b) => (b.parentId ?? '') === parentId)
+  const kids = siblings.filter((b) => b.id !== dragId).map((b) => b.rect)
+  if (!kids.length) return null
+  // The axis comes from the whole row, dragged block included: with one sibling left it cannot be inferred.
+  const row = isRow(siblings.map((b) => b.rect))
+  const x0 = Math.min(...kids.map((k) => k.x))
+  const y0 = Math.min(...kids.map((k) => k.y))
+  const w = Math.max(...kids.map((k) => k.x + k.w)) - x0
+  const h = Math.max(...kids.map((k) => k.y + k.h)) - y0
+  // boundary coordinate along the flow axis: before the first, centred in each gap, after the last
+  const pos = [kids[0][row ? 'x' : 'y'], ...kids.slice(1).map((k, i) => (row ? (kids[i].x + kids[i].w + k.x) / 2 : (kids[i].y + kids[i].h + k.y) / 2)), row ? kids[kids.length - 1].x + kids[kids.length - 1].w : kids[kids.length - 1].y + kids[kids.length - 1].h]
+  const lines = pos.map((p): Rect => (row ? { x: p - 1.5, y: y0, w: 3, h } : { x: x0, y: p - 1.5, w, h: 3 }))
+  const at = row ? point.x : point.y
+  let index = 0
+  pos.forEach((p, i) => {
+    if (Math.abs(p - at) < Math.abs(pos[index] - at)) index = i
+  })
+  return { parentId, index, line: lines[index], snaps: lines }
+}
+
+/** The page-level extent (all root blocks, plus a margin): outside it the pointer is over editor chrome. */
+export function rootExtent(blocks: DndBlock[], margin = 24): Rect | null {
+  const top = blocks.filter((b) => !b.parentId)
+  if (!top.length) return null
+  const x0 = Math.min(...top.map((b) => b.rect.x)) - margin
+  const y0 = Math.min(...top.map((b) => b.rect.y)) - margin
+  return { x: x0, y: y0, w: Math.max(...top.map((b) => b.rect.x + b.rect.w)) + margin - x0, h: Math.max(...top.map((b) => b.rect.y + b.rect.h)) + margin - y0 }
+}
+
+/**
+ * Where an existing block lands when dragged. Default is sorting among its current siblings (snapping
+ * between them); holding Alt - or leaving the parent's area - switches to the general "drop into whatever
+ * container is under the pointer" behaviour.
+ */
+export function moveTarget(blocks: DndBlock[], point: { x: number; y: number }, drag: { id: string; parentId?: string }, opts: { nest?: boolean; accepts?: (parentId: string) => boolean } = {}): DropTarget | null {
+  const parentId = drag.parentId ?? ''
+  if (!opts.nest) {
+    const area = parentId ? blocks.find((b) => b.id === parentId)?.rect : rootExtent(blocks)
+    const pad = parentId ? 12 : 0
+    if (area && inside({ x: area.x - pad, y: area.y - pad, w: area.w + pad * 2, h: area.h + pad * 2 }, point)) {
+      const t = sortTarget(blocks, point, drag.id, parentId)
+      if (t) return t
+    }
+  }
+  return dropTarget(blocks, point, drag.id, opts.accepts)
+}
diff --git a/src/page/infer.ts b/src/page/infer.ts
new file mode 100644
index 0000000..a79fea4
--- /dev/null
+++ b/src/page/infer.ts
@@ -0,0 +1,132 @@
+// Make every string property editable where it is *rendered*.
+//
+// Templates only mark a few fields with `data-cms-field`. For the rest we bind the node's data to
+// the DOM by value: a property whose text appears as exactly one leaf element of the block becomes
+// an inline text field; one whose value appears as exactly one attribute (href, src, alt…) becomes an
+// attribute chip. Matching is strict on purpose - ambiguous values (the same text twice, or two
+// properties with the same value) are skipped rather than guessed, and those properties stay
+// editable in the Properties dialog.
+import type { JSONSchema } from '../api'
+import { resolveSchema } from '../form/resolve'
+
+export type Path = Array<string | number>
+
+export interface StringLeaf {
+  path: Path
+  value: string
+}
+export interface AttrBinding {
+  el: HTMLElement
+  attr: string
+  path: string
+  value: string
+}
+
+export const pathKey = (p: Path) => p.join('.')
+export const parsePath = (key: string): Path => key.split('.').map((s) => (/^\d+$/.test(s) ? Number(s) : s))
+
+export function getIn(data: unknown, path: Path): unknown {
+  let cur: any = data
+  for (const k of path) cur = cur?.[k]
+  return cur
+}
+
+/**
+ * The `set` payload that writes `value` at `path`: a flat key for top-level fields, otherwise the whole
+ * top-level value rebuilt with the one leaf changed (`set` merges only at the top level).
+ */
+export function patchForPath(data: Record<string, any>, path: Path, value: unknown): Record<string, unknown> {
+  if (path.length === 1) return { [path[0]]: value }
+  const top = structuredClone(data[path[0]] ?? (typeof path[1] === 'number' ? [] : {}))
+  let cur: any = top
+  for (let i = 1; i < path.length - 1; i++) cur = cur[path[i]] ??= typeof path[i + 1] === 'number' ? [] : {}
+  cur[path[path.length - 1]] = value
+  return { [path[0]]: top }
+}
+
+const SKIP_EDITORS = new Set(['hidden', 'readonly', 'markdown', 'html', 'richtext', 'monaco', 'json', 'asset', 'node', 'dictionary'])
+const LIFECYCLE = new Set(['lastModified', 'status', 'createdAt', 'updatedAt', 'id'])
+
+/** Every editable string in `data`, with its path, skipping what cannot be edited as plain text. */
+export function collectStrings(data: Record<string, any>, root?: JSONSchema): StringLeaf[] {
+  const out: StringLeaf[] = []
+  const walk = (value: unknown, path: Path, schema: JSONSchema | undefined, depth: number) => {
+    if (out.length >= 300 || depth > 6) return
+    const s = schema && root ? resolveSchema(root, schema).schema : undefined
+    if (s && (s.readOnly || s.enum || 'const' in s || SKIP_EDITORS.has(s['x-editor']))) return
+    if (typeof value === 'string') {
+      if (value.trim() !== '') out.push({ path, value })
+    } else if (Array.isArray(value)) {
+      value.forEach((v, i) => walk(v, [...path, i], s?.items && !Array.isArray(s.items) ? s.items : undefined, depth + 1))
+    } else if (value && typeof value === 'object') {
+      for (const [k, v] of Object.entries(value)) {
+        if (depth === 0 && LIFECYCLE.has(k)) continue
+        const additional = s?.additionalProperties && typeof s.additionalProperties === 'object' ? s.additionalProperties : undefined
+        walk(v, [...path, k], s?.properties?.[k] ?? additional, depth + 1)
+      }
+    }
+  }
+  walk(data, [], root, 0)
+  return out
+}
+
+const norm = (s: string) => s.replace(/\s+/g, ' ').trim()
+const ATTRS = ['href', 'src', 'alt', 'title', 'placeholder', 'aria-label', 'value']
+const SKIP_TAGS = new Set(['SCRIPT', 'STYLE', 'SVG', 'NOSCRIPT', 'TEMPLATE', 'TEXTAREA', 'SELECT', 'OPTION'])
+
+/** An element that is "just text": no element children (a `<br>` is fine). */
+const isTextLeaf = (el: Element) => !SKIP_TAGS.has(el.tagName.toUpperCase()) && Array.from(el.children).every((c) => c.tagName === 'BR') && norm(el.textContent ?? '') !== ''
+
+export interface Inferred {
+  text: Array<{ el: HTMLElement; path: string }>
+  attrs: AttrBinding[]
+}
+
+/**
+ * Match string leaves to the block's own DOM (`owns` excludes nested blocks, which bind their own data).
+ * Elements already carrying an explicit `data-cms-field` are left alone.
+ */
+export function inferBindings(block: HTMLElement, owns: (el: Element) => boolean, strings: StringLeaf[]): Inferred {
+  const els = Array.from(block.querySelectorAll<HTMLElement>('*')).filter((el) => owns(el))
+  // Only *template* markers count as explicit: our own earlier inference must stay re-inferable.
+  const explicit = (e: Element) => e.hasAttribute('data-cms-field') && !e.hasAttribute(INFERRED_ATTR)
+  const leaves = els.filter((el) => isTextLeaf(el) && !explicit(el))
+  const claimed = new Set(els.filter(explicit).map((e) => norm(e.textContent ?? '')))
+
+  // A value shared by several properties cannot be attributed to one of them.
+  const count = new Map<string, number>()
+  for (const s of strings) count.set(norm(s.value), (count.get(norm(s.value)) ?? 0) + 1)
+
+  const text: Inferred['text'] = []
+  const attrs: AttrBinding[] = []
+  for (const s of strings) {
+    const v = norm(s.value)
+    if (count.get(v) !== 1 || claimed.has(v)) continue
+    const hits = leaves.filter((el) => norm(el.textContent ?? '') === v)
+    if (hits.length === 1) {
+      text.push({ el: hits[0], path: pathKey(s.path) })
+      continue
+    }
+    if (hits.length > 1) continue
+    const found: AttrBinding[] = []
+    for (const el of els) for (const attr of ATTRS) if (el.getAttribute(attr) === s.value) found.push({ el, attr, path: pathKey(s.path), value: s.value })
+    if (found.length === 1) attrs.push(found[0])
+  }
+  return { text, attrs }
+}
+
+export const INFERRED_ATTR = 'data-cms-inferred'
+
+/** Tag text leaves so the normal inline-edit machinery (click / double-click) picks them up. */
+export function markInferred(block: HTMLElement, text: Inferred['text']) {
+  for (const el of block.querySelectorAll(`[${INFERRED_ATTR}]`)) {
+    el.removeAttribute('data-cms-field')
+    el.removeAttribute('data-cms-editor')
+    el.removeAttribute(INFERRED_ATTR)
+  }
+  for (const { el, path } of text) {
+    el.setAttribute('data-cms-field', path)
+    el.setAttribute('data-cms-editor', 'text')
+    el.setAttribute(INFERRED_ATTR, '')
+  }
+}
diff --git a/src/registry.ts b/src/registry.ts
new file mode 100644
index 0000000..bcb97ff
--- /dev/null
+++ b/src/registry.ts
@@ -0,0 +1,165 @@
+// Extension points. Everything the editor can attach to a node is looked up
+// here at runtime, so new dialogs/editors can be added (or replaced) by calling
+// one function - from the bundle, from another script, or from the console via
+// `window.__cmsEditor.registerEditor(...)`.
+import type { ComponentType } from 'react'
+import type { CmsNode, JSONSchema } from './api'
+import type { Controller } from './controller'
+
+/** What the editor knows about a block on the page. */
+export interface BlockInfo {
+  id: string
+  type: string
+  el: HTMLElement
+  container: boolean
+  parentId?: string
+  /** The node type's JSON Schema, once loaded (undefined for a moment after a type first appears). */
+  schema?: JSONSchema
+}
+
+export interface Registration<T> {
+  def: T
+  /** Remove it again. */
+  dispose(): void
+}
+
+class Registry<T extends { id: string }> {
+  private items = new Map<string, T>()
+  private listeners = new Set<() => void>()
+  version = 0
+  add(def: T): () => void {
+    this.items.set(def.id, def) // same id replaces: that's how defaults are overridden
+    this.bump()
+    return () => {
+      if (this.items.get(def.id) === def) {
+        this.items.delete(def.id)
+        this.bump()
+      }
+    }
+  }
+  all(): T[] {
+    return [...this.items.values()]
+  }
+  get(id: string) {
+    return this.items.get(id)
+  }
+  subscribe(fn: () => void) {
+    this.listeners.add(fn)
+    return () => void this.listeners.delete(fn)
+  }
+  private bump() {
+    this.version++
+    this.listeners.forEach((f) => f())
+  }
+}
+
+// --- block editors: dialogs / popovers attached to a node -------------------
+
+export interface EditorProps {
+  info: BlockInfo
+  node: CmsNode
+  schema: JSONSchema
+  ctrl: Controller
+  /** Close the dialog this editor is shown in. */
+  close(): void
+}
+
+export type Match = string | string[] | ((info: BlockInfo) => boolean)
+
+export interface BlockEditorDef {
+  id: string
+  /** Toolbar tooltip / dialog title. */
+  label: string
+  /** Icon name from `ui/Icon` (e.g. 'edit', 'style'); falls back to the label's first letter. */
+  icon?: string
+  /** `menu` puts it under the toolbar's "…" overflow instead of as a button (rarely-used / developer tools). */
+  placement?: 'toolbar' | 'menu'
+  /** Node type(s), '*' for all, or a predicate (e.g. `info => info.el.matches('.hero')`). */
+  match: Match
+  component: ComponentType<EditorProps>
+  /** Higher = earlier in the toolbar. Default 0. */
+  priority?: number
+  /** Dialog size hint. */
+  size?: 'sm' | 'md' | 'lg'
+  /** Open on double-click of the block (the highest-priority editor with this wins). */
+  onDoubleClick?: boolean
+}
+
+export const blockEditors = new Registry<BlockEditorDef>()
+export const registerEditor = (def: BlockEditorDef) => blockEditors.add(def)
+
+export function matches(m: Match, info: BlockInfo): boolean {
+  if (typeof m === 'function') return m(info)
+  const list = Array.isArray(m) ? m : [m]
+  return list.includes('*') || list.includes(info.type)
+}
+
+export function editorsFor(info: BlockInfo): BlockEditorDef[] {
+  return blockEditors
+    .all()
+    .filter((d) => matches(d.match, info))
+    .sort((a, b) => (b.priority ?? 0) - (a.priority ?? 0))
+}
+
+/**
+ * Attach an ad-hoc dialog to blocks without defining a type: by CSS selector,
+ * by node id, or by element. It shows up as a toolbar button on matching blocks.
+ */
+export function attachDialog(
+  target: string | HTMLElement | { nodeId: string },
+  component: ComponentType<EditorProps>,
+  opts: Partial<Omit<BlockEditorDef, 'component' | 'match'>> = {},
+): () => void {
+  const match = (info: BlockInfo) =>
+    typeof target === 'string' ? info.el.matches(target) : target instanceof HTMLElement ? info.el === target : info.id === target.nodeId
+  return registerEditor({
+    id: opts.id ?? `attached:${Math.random().toString(36).slice(2, 8)}`,
+    label: opts.label ?? 'Edit',
+    match,
+    component,
+    ...opts,
+  })
+}
+
+// --- field editors: widgets inside the schema form --------------------------
+
+export interface FieldProps {
+  /** Resolved schema of this field. */
+  schema: JSONSchema
+  value: unknown
+  onChange(v: unknown): void
+  /** Property name / path, for labels and ids. */
+  path: string
+  node: CmsNode
+  ctrl: Controller
+}
+
+export interface FieldEditorDef {
+  id: string
+  /** Decide from the field schema (`x-editor`, `format`, name, ...) and its path. */
+  match(schema: JSONSchema, path: string, node: CmsNode): boolean
+  component: ComponentType<FieldProps>
+  priority?: number
+}
+
+export const fieldEditors = new Registry<FieldEditorDef>()
+export const registerFieldEditor = (def: FieldEditorDef) => fieldEditors.add(def)
+export const fieldEditorFor = (schema: JSONSchema, path: string, node: CmsNode) =>
+  fieldEditors
+    .all()
+    .filter((d) => d.match(schema, path, node))
+    .sort((a, b) => (b.priority ?? 0) - (a.priority ?? 0))[0]
+
+// --- inline editors: edit a rendered field in place -------------------------
+
+export interface InlineSession {
+  /** Stop editing, flushing pending changes. */
+  stop(): void
+}
+export interface InlineEditorDef {
+  /** Value of `data-cms-editor`. */
+  id: string
+  start(args: { el: HTMLElement; node: CmsNode; field: string; ctrl: Controller }): InlineSession
+}
+export const inlineEditors = new Registry<InlineEditorDef>()
+export const registerInlineEditor = (def: InlineEditorDef) => inlineEditors.add(def)
diff --git a/src/schema.ts b/src/schema.ts
new file mode 100644
index 0000000..f7c752d
--- /dev/null
+++ b/src/schema.ts
@@ -0,0 +1,97 @@
+// Helpers over the CMS's JSON Schemas (`GET /api/schemas/{type}`), including the
+// `x-graph` extension that says what a node may contain.
+import type { JSONSchema } from './api'
+
+export interface XGraph {
+  children?: string[]
+  connections?: Record<string, unknown>
+  accepts?: string[]
+  [k: string]: unknown
+}
+
+export const xGraph = (schema?: JSONSchema): XGraph => (schema?.['x-graph'] as XGraph) ?? {}
+
+/** A type entry from `GET /api/types`, tolerant of the field it calls the name. */
+export const typeName = (t: unknown): string => {
+  if (typeof t === 'string') return t
+  const o = (t ?? {}) as Record<string, unknown>
+  return String(o.type ?? o.name ?? o.dataType ?? o.id ?? '')
+}
+
+/**
+ * Node types that may be inserted as children of a node with this schema. The real schemas say
+ * `x-graph.children: true` (anything), a list of type names, or `['*']`; `accepts` is the older spelling.
+ */
+export function allowedChildren(schema: JSONSchema | undefined, allTypes: string[]): string[] {
+  const g = xGraph(schema)
+  const rule = (g.children ?? g.accepts) as unknown
+  if (rule === true) return allTypes
+  if (!Array.isArray(rule)) return []
+  return rule.includes('*') ? allTypes : (rule as string[])
+}
+
+/** Name of the property that titles a node of this type (`x-graph.label`), e.g. "title". */
+export const labelKey = (schema?: JSONSchema): string | undefined => {
+  const l = xGraph(schema).label
+  return typeof l === 'string' && l ? l : undefined
+}
+
+/** Category of a node type (`x-graph.group`), e.g. "Commerce". */
+export const groupOf = (schema?: JSONSchema): string | undefined => {
+  const g = xGraph(schema).group
+  return typeof g === 'string' && g ? g : undefined
+}
+
+export const OTHER_GROUP = 'Other'
+
+/** Group names in display order: alphabetical, with the catch-all last. */
+export const sortGroups = (names: Iterable<string>): string[] => [...new Set(names)].sort((a, b) => (a === OTHER_GROUP ? 1 : b === OTHER_GROUP ? -1 : a.localeCompare(b)))
+
+/** Can a node of `type` be dropped inside a container of this schema? Unknown schema = optimistic. */
+export function acceptsChild(schema: JSONSchema | undefined, type: string, allTypes: string[]): boolean {
+  if (!schema) return true
+  return allowedChildren(schema, allTypes).includes(type)
+}
+
+/** Resolve a local `$ref` ("#/$defs/x") against the root schema. */
+export function deref(root: JSONSchema, s: JSONSchema | undefined): JSONSchema {
+  let cur = s ?? {}
+  for (let i = 0; i < 8 && typeof cur.$ref === 'string'; i++) {
+    const path = cur.$ref.replace(/^#\//, '').split('/')
+    let t: any = root
+    for (const p of path) t = t?.[p]
+    cur = { ...t, ...Object.fromEntries(Object.entries(cur).filter(([k]) => k !== '$ref')) }
+  }
+  return cur
+}
+
+export type FieldKind = 'string' | 'text' | 'markdown' | 'number' | 'boolean' | 'enum' | 'object' | 'array' | 'json'
+
+/** Pick the widget for a (resolved) schema node. */
+export function fieldKind(s: JSONSchema): FieldKind {
+  if (s.enum) return 'enum'
+  const editor = s['x-editor'] ?? s.format
+  if (editor === 'markdown') return 'markdown'
+  if (editor === 'textarea' || editor === 'text' || editor === 'html') return 'text'
+  const t = Array.isArray(s.type) ? s.type.find((x: string) => x !== 'null') : s.type
+  switch (t) {
+    case 'string':
+      return s.maxLength && s.maxLength > 200 ? 'text' : 'string'
+    case 'integer':
+    case 'number':
+      return 'number'
+    case 'boolean':
+      return 'boolean'
+    case 'object':
+      return s.properties ? 'object' : 'json'
+    case 'array':
+      return 'json'
+    default:
+      return s.properties ? 'object' : 'json'
+  }
+}
+
+export const labelOf = (key: string, s: JSONSchema) => s.title ?? key.replace(/([a-z])([A-Z])/g, '$1 $2').replace(/^./, (c) => c.toUpperCase())
+
+/** Properties the user shouldn't edit: lifecycle keys are rejected by the server. */
+export const READONLY_KEYS = new Set(['lastModified', 'status', 'createdAt', 'updatedAt', 'id'])
diff --git a/src/store.ts b/src/store.ts
new file mode 100644
index 0000000..0149fb9
--- /dev/null
+++ b/src/store.ts
@@ -0,0 +1,44 @@
+import { useRef, useSyncExternalStore } from 'react'
+
+export interface Store<T> {
+  get(): T
+  set(patch: Partial<T> | ((s: T) => Partial<T>)): void
+  subscribe(fn: () => void): () => void
+}
+
+/** Minimal external store; `useStore` binds it to React. */
+export function createStore<T extends object>(initial: T): Store<T> {
+  let state = initial
+  const subs = new Set<() => void>()
+  return {
+    get: () => state,
+    set(patch) {
+      const next = typeof patch === 'function' ? patch(state) : patch
+      state = { ...state, ...next }
+      subs.forEach((f) => f())
+    },
+    subscribe(fn) {
+      subs.add(fn)
+      return () => void subs.delete(fn)
+    },
+  }
+}
+
+const shallowEqual = (a: unknown, b: unknown): boolean => {
+  if (Object.is(a, b)) return true
+  if (typeof a !== 'object' || typeof b !== 'object' || !a || !b) return false
+  const ka = Object.keys(a)
+  return ka.length === Object.keys(b).length && ka.every((k) => Object.is((a as any)[k], (b as any)[k]))
+}
+
+/** Subscribe to a slice. Selectors may return fresh objects: results are shallow-compared and memoised. */
+export function useStore<T extends object, S>(store: Store<T>, select: (s: T) => S): S {
+  const last = useRef<{ v: S } | null>(null)
+  const get = () => {
+    const next = select(store.get())
+    if (last.current && shallowEqual(last.current.v, next)) return last.current.v
+    last.current = { v: next }
+    return next
+  }
+  return useSyncExternalStore(store.subscribe, get)
+}
diff --git a/src/style/BoxHandles.tsx b/src/style/BoxHandles.tsx
new file mode 100644
index 0000000..04e38be
--- /dev/null
+++ b/src/style/BoxHandles.tsx
@@ -0,0 +1,114 @@
+import { useEffect, useMemo, useRef, useState } from 'react'
+import type { Block } from '../controller'
+import { useCtrl, useEditorState } from '../ui/hooks'
+import { computeHandles, dragPx, previewProperty } from './handles'
+import type { Box, Handle, Rect } from './handles'
+import { describeStyle, effective } from './model'
+import { pxOf, snap } from './tokens'
+
+const px = (v: string) => parseFloat(v) || 0
+const boxOf = (cs: CSSStyleDeclaration, p: 'padding' | 'margin'): Box => ({ top: px(cs.getPropertyValue(`${p}-top`)), right: px(cs.getPropertyValue(`${p}-right`)), bottom: px(cs.getPropertyValue(`${p}-bottom`)), left: px(cs.getPropertyValue(`${p}-left`)) })
+const rectOf = (el: Element): Rect => {
+  const r = el.getBoundingClientRect()
+  return { x: r.x, y: r.y, w: r.width, h: r.height }
+}
+const css = (r: Rect) => ({ left: r.x, top: r.y, width: r.w, height: r.h })
+
+/**
+ * Padding / margin / gap bands drawn over the selected block (like devtools), each with a grip you
+ * drag. Dragging snaps to the field's token scale, previews live, and commits one coalesced `set`.
+ * Only sides the schema can express get a grip - a block with no spacing fields shows nothing.
+ */
+export function BoxHandles({ block }: { block: Block }) {
+  const ctrl = useCtrl()
+  useEditorState((s) => s.tick)
+  useEditorState((s) => s.schemasVersion)
+  const fields = useMemo(() => describeStyle(block.schema).filter((f) => f.options.length > 0 && (f.kind === 'spacing' || f.kind === 'gap')), [block.schema])
+  const [drag, setDrag] = useState<{ handle: Handle; token: string; label: string } | null>(null)
+  if (!fields.length || !block.el.isConnected) return null
+
+  const cs = block.el.ownerDocument.defaultView!.getComputedStyle(block.el)
+  const handles = computeHandles({
+    rect: rectOf(block.el),
+    padding: boxOf(cs, 'padding'),
+    margin: boxOf(cs, 'margin'),
+    children: Array.from(block.el.children).map(rectOf),
+    fields,
+  })
+  return (
+    <>
+      {handles.map((h) => (
+        <div key={`b-${h.id}`} className={`cms-band cms-band--${h.kind}`} style={css(h.band)} aria-hidden="true" />
+      ))}
+      {handles.map((h) => (
+        <Grip key={h.id} handle={h} block={block} active={drag?.handle.id === h.id} onDrag={setDrag} />
+      ))}
+      {drag && (
+        <div className="cms-tip" style={{ left: drag.handle.grip.x + drag.handle.grip.w + 8, top: drag.handle.grip.y - 4 }}>
+          {drag.label} · <b>{drag.token}</b>
+        </div>
+      )}
+    </>
+  )
+}
+
+function Grip({ handle: h, block, active, onDrag }: { handle: Handle; block: Block; active: boolean; onDrag(d: { handle: Handle; token: string; label: string } | null): void }) {
+  const ctrl = useCtrl()
+  // px is captured once at pointer-down: the live handle's px includes our own preview and would compound.
+  const start = useRef<{ x: number; y: number; px: number; value?: string } | null>(null)
+  const [hover, setHover] = useState(false)
+  useEffect(() => () => ctrl.clearPreview(), [ctrl])
+
+  const tokenAt = (e: React.PointerEvent) => {
+    const s = start.current!
+    const scale = ctrl.scaleFor(h.field)
+    const now = dragPx({ axis: h.axis, sign: h.sign, px: s.px }, e.clientX - s.x, e.clientY - s.y)
+    const token = snap(scale, s.value, s.px, now - s.px)
+    return { token, scale }
+  }
+
+  return (
+    <div
+      className={`cms-grip-h cms-grip-h--${h.kind} cms-grip-h--${h.axis}${active ? ' is-active' : ''}`}
+      style={css(h.grip)}
+      role="slider"
+      aria-label={`${h.label}: ${Math.round(h.px)}px`}
+      aria-valuenow={Math.round(h.px)}
+      title={`${h.label} · ${Math.round(h.px)}px (drag)`}
+      onPointerEnter={() => setHover(true)}
+      onPointerLeave={() => setHover(false)}
+      onPointerDown={(e) => {
+        e.preventDefault()
+        e.stopPropagation()
+        e.currentTarget.setPointerCapture?.(e.pointerId)
+        start.current = { x: e.clientX, y: e.clientY, px: h.px }
+        // The starting token is only needed for unmeasured (ordinal) scales; resolve it without blocking the drag.
+        void ctrl.node(block.id).then((n) => {
+          if (start.current) start.current.value = String(effective(n.data ?? {}, ctrl.styleFields(block.id), h.field).value ?? '') || undefined
+        })
+      }}
+      onPointerMove={(e) => {
+        if (!start.current) return
+        const { token, scale } = tokenAt(e)
+        const target = pxOf(scale, token)
+        if (target !== null) ctrl.previewStyle(block.id, previewProperty(h.field, h.edge), target)
+        onDrag({ handle: h, token, label: h.label })
+      }}
+      onPointerUp={async (e) => {
+        if (!start.current) return
+        const { token } = tokenAt(e)
+        const moved = Math.abs(e.clientX - start.current.x) + Math.abs(e.clientY - start.current.y) > 2
+        start.current = null
+        onDrag(null)
+        if (moved) await ctrl.setStyle(block.id, h.field, token)
+        ctrl.clearPreview()
+      }}
+      onPointerCancel={() => {
+        start.current = null
+        ctrl.clearPreview()
+        onDrag(null)
+      }}
+      data-hover={hover || undefined}
+    />
+  )
+}
diff --git a/src/style/StylePanel.tsx b/src/style/StylePanel.tsx
new file mode 100644
index 0000000..813069d
--- /dev/null
+++ b/src/style/StylePanel.tsx
@@ -0,0 +1,247 @@
+import { useEffect, useMemo, useState } from 'react'
+import type { ReactNode } from 'react'
+import type { EditorProps } from '../registry'
+import { useEditorState } from '../ui/hooks'
+import { BREAKPOINTS, effective, patchFor, readField } from './model'
+import type { Breakpoint, StyleField } from './model'
+import { pxOf } from './tokens'
+import type { Scale } from './tokens'
+import { Icon } from '../ui/Icon'
+import { describeStyle, fieldForSide } from './model'
+
+type Data = Record<string, any>
+
+const LEGACY_FLOW = ['vertical', 'horizontal', 'grid']
+const ICON: Record<string, Record<string, string>> = {
+  flow: { row: 'flow-row', stack: 'flow-stack', actions: 'flow-actions', vertical: 'flow-stack', horizontal: 'flow-row', grid: 'flow-grid' },
+  align: { start: 'align-start', center: 'align-center', end: 'align-end', left: 'text-left', right: 'text-right' },
+  justify: { start: 'align-start', center: 'align-center', end: 'align-end' },
+}
+const cap = (o: string) => o[0].toUpperCase() + o.slice(1)
+
+/** Apply a `set` payload to local data the way the server will (null deletes). */
+const applyLocal = (data: Data, patch: Record<string, unknown>): Data => {
+  const next = { ...data }
+  for (const [k, v] of Object.entries(patch)) v === null ? delete next[k] : (next[k] = v)
+  return next
+}
+
+/**
+ * The "Style" dialog: controls for every schema field tagged `x-style` (or inferred from naming),
+ * grouped by what they do. Nothing here knows a node type - add an `x-style` field to any schema
+ * and it shows up. Spacing is a box-model diagram; breakpoints edit `responsive.<bp>.*`.
+ */
+export function StylePanel({ node, schema, ctrl }: EditorProps) {
+  const fields = useMemo(() => describeStyle(schema), [schema])
+  const [data, setData] = useState<Data>(node.data ?? {})
+  const [bp, setBp] = useState<Breakpoint | undefined>()
+  const rev = useEditorState((s) => s.editRev)
+  useEffect(() => {
+    if (rev) void ctrl.node(node.id, true).then((n) => setData(n.data ?? {})).catch(() => {})
+  }, [rev, ctrl, node.id])
+
+  const hasResponsive = fields.some((f) => f.responsive.length)
+  const shown = bp ? fields.filter((f) => f.responsive.includes(bp)) : fields
+  const set = (f: StyleField, v: unknown) => {
+    setData((d) => applyLocal(d, patchFor(d, f, v, bp)))
+    void ctrl.setStyle(node.id, f, v, { bp })
+  }
+  const get = (f: StyleField) => readField(data, f, bp)
+
+  const of = (...kinds: StyleField['kind'][]) => shown.filter((f) => kinds.includes(f.kind))
+  const flow = fields.find((f) => f.kind === 'flow')
+  const flowValue = flow ? String(readField(data, flow, bp) ?? data[flow.name] ?? '') : ''
+  const showColumns = !flow || !flowValue || ['row', 'grid', 'horizontal'].includes(flowValue)
+
+  return (
+    <div className="cms-style">
+      {hasResponsive && (
+        <div className="cms-tabs" role="tablist" aria-label="Breakpoint">
+          {[undefined, ...BREAKPOINTS].map((b) => (
+            <button key={b ?? 'base'} role="tab" aria-selected={bp === b} className={bp === b ? 'is-on' : ''} onClick={() => setBp(b)}>
+              {b ? b[0].toUpperCase() + b.slice(1) : 'All sizes'}
+            </button>
+          ))}
+        </div>
+      )}
+      {bp && <p className="cms-muted">Overrides for {bp === 'mobile' ? 'small screens' : bp === 'tablet' ? 'tablets' : 'desktops'}; unset values inherit from “All sizes”.</p>}
+
+      {of('flow', 'columns', 'align', 'justify').length > 0 && (
+        <Section title="Layout">
+          {of('flow', 'columns', 'align', 'justify')
+            .filter((f) => f.kind !== 'columns' || showColumns)
+            .map((f) => (
+              <Control key={f.name} f={f} value={get(f)} onChange={(v) => set(f, v)} />
+            ))}
+        </Section>
+      )}
+
+      {!bp && fields.some((f) => f.kind === 'spacing' || f.kind === 'gap') && (
+        <Section title="Spacing">
+          <BoxModel fields={fields} data={data} onChange={set} ctrl={ctrl} />
+          {fields.filter((f) => f.kind === 'gap').map((f) => (
+            <Control key={f.name} f={f} value={data[f.name]} onChange={(v) => set(f, v)} scale={f.options.length ? ctrl.scaleFor(f) : undefined} />
+          ))}
+        </Section>
+      )}
+
+      {of('tone', 'border').length > 0 && (
+        <Section title="Surface">
+          {of('tone', 'border').map((f) => (
+            <Control key={f.name} f={f} value={get(f)} onChange={(v) => set(f, v)} />
+          ))}
+        </Section>
+      )}
+      {of('reveal', 'choice').length > 0 && (
+        <Section title="More">
+          {of('reveal', 'choice').map((f) => (
+            <Control key={f.name} f={f} value={get(f)} onChange={(v) => set(f, v)} />
+          ))}
+        </Section>
+      )}
+
+      {fields.some((f) => f.inferred) && <p className="cms-muted cms-style__note">Controls detected from field names. Add <code>x-style</code> to the schema to make this explicit.</p>}
+    </div>
+  )
+}
+
+function Section({ title, children }: { title: string; children: ReactNode }) {
+  return (
+    <section className="cms-style__section">
+      <h4>{title}</h4>
+      {children}
+    </section>
+  )
+}
+
+// --- controls ------------------------------------------------------------------------
+
+function Control({ f, value, onChange, scale }: { f: StyleField; value: unknown; onChange(v: unknown): void; scale?: Scale }) {
+  const set = value !== undefined && value !== null
+  return (
+    <div className="cms-ctl" data-style-field={f.name}>
+      <div className="cms-ctl__head">
+        <span className="cms-ctl__label" title={f.description}>
+          {f.label}
+        </span>
+        {set && (
+          <button type="button" className="cms-ctl__clear" aria-label={`Reset ${f.label}`} title="Reset (inherit)" onClick={() => onChange(undefined)}>
+            <Icon name="refresh" size={14} />
+          </button>
+        )}
+      </div>
+      <Widget f={f} value={value} onChange={onChange} scale={scale} />
+    </div>
+  )
+}
+
+function Widget({ f, value, onChange, scale }: { f: StyleField; value: unknown; onChange(v: unknown): void; scale?: Scale }) {
+  if (f.kind === 'columns') return <Columns f={f} value={value} onChange={onChange} />
+  const icons = ICON[f.kind] ?? {}
+  let options = f.options.map(String)
+  if (f.kind === 'flow' && !LEGACY_FLOW.includes(String(value))) options = options.filter((o) => !LEGACY_FLOW.includes(o))
+  if (options.length > 6) {
+    return (
+      <select className="cms-input" value={value === undefined ? '' : String(value)} onChange={(e) => onChange(e.target.value === '' ? undefined : e.target.value)}>
+        <option value="">—</option>
+        {options.map((o) => (
+          <option key={o}>{o}</option>
+        ))}
+      </select>
+    )
+  }
+  return <Chips options={options} value={value as string | undefined} onChange={onChange} icons={icons} scale={scale} />
+}
+
+function Chips({ options, value, onChange, icons = {}, scale }: { options: string[]; value?: string; onChange(v: string): void; icons?: Record<string, string>; scale?: Scale }) {
+  return (
+    <div className="cms-chips" role="radiogroup">
+      {options.map((o) => {
+        const px = scale ? pxOf(scale, o) : null
+        return (
+          <button key={o} type="button" role="radio" aria-checked={value === o} className={`cms-chip${value === o ? ' is-on' : ''}`} title={px !== null ? `${Math.round(px)}px` : undefined} onClick={() => onChange(o)}>
+            {icons[o] && <Icon name={icons[o]} size={15} />}
+            {icons[o] ? cap(o) : o}
+          </button>
+        )
+      })}
+    </div>
+  )
+}
+
+function Columns({ f, value, onChange }: { f: StyleField; value: unknown; onChange(v: unknown): void }) {
+  if (f.options.length) return <Chips options={f.options.map(String)} value={value === undefined ? undefined : String(value)} onChange={(v) => onChange(Number(v))} />
+  const min = f.min ?? 1
+  const max = f.max ?? 12
+  const n = typeof value === 'number' ? value : undefined
+  return (
+    <div className="cms-stepper">
+      <button type="button" className="cms-ico" aria-label="Fewer columns" disabled={(n ?? min) <= min} onClick={() => onChange(Math.max(min, (n ?? min + 1) - 1))}>
+        −
+      </button>
+      <input className="cms-input" type="number" aria-label="Columns" min={min} max={max} value={n ?? ''} placeholder="auto" onChange={(e) => onChange(e.target.value === '' ? undefined : Math.min(max, Math.max(min, Number(e.target.value))))} />
+      <button type="button" className="cms-ico" aria-label="More columns" disabled={(n ?? 0) >= max} onClick={() => onChange(Math.min(max, (n ?? min - 1) + 1))}>
+        +
+      </button>
+    </div>
+  )
+}
+
+// --- box model ---------------------------------------------------------------------------
+
+type Edge = 'top' | 'right' | 'bottom' | 'left'
+
+/** margin ⟶ padding diagram: one token select per side the schema can express. */
+function BoxModel({ fields, data, onChange, ctrl }: { fields: StyleField[]; data: Data; onChange(f: StyleField, v: unknown): void; ctrl: EditorProps['ctrl'] }) {
+  const boxes = (['margin', 'padding'] as const).filter((b) => fields.some((f) => f.kind === 'spacing' && f.box === b && f.options.length))
+  if (!boxes.length) return null
+  const cell = (box: 'margin' | 'padding', edge: Edge, seenAll: Set<string>) => {
+    const f = fieldForSide(fields, box, edge)
+    if (!f) return <span className="cms-box__none">–</span>
+    if (f.side === 'all' || f.side === 'x' || f.side === 'y') {
+      // One field covers several edges: put its select on the first, mark the rest as linked.
+      if (seenAll.has(f.name)) return <span className="cms-box__link" title={`${f.label} (shared)`}>
+          <Icon name="link" size={12} /> {f.side === 'all' ? 'all' : f.side}
+        </span>
+      seenAll.add(f.name)
+    }
+    const { value, from } = effective(data, fields, f)
+    const own = data[f.name]
+    const scale = ctrl.scaleFor(f)
+    return (
+      <select
+        className={`cms-box__sel${own === undefined || own === null ? ' is-inherited' : ''}`}
+        aria-label={`${box} ${f.side === 'all' ? 'all sides' : edge}`}
+        value={own === undefined || own === null ? '' : String(own)}
+        onChange={(e) => onChange(f, e.target.value === '' ? undefined : e.target.value)}
+        title={f.description}
+      >
+        <option value="">{value !== undefined && from !== f ? `${String(value)} (${from.name})` : '—'}</option>
+        {f.options.map((o) => {
+          const px = pxOf(scale, String(o))
+          return (
+            <option key={String(o)} value={String(o)}>
+              {String(o)}
+              {px !== null ? ` · ${Math.round(px)}` : ''}
+            </option>
+          )
+        })}
+      </select>
+    )
+  }
+  const render = (i: number): ReactNode => {
+    const box = boxes[i]
+    const seen = new Set<string>()
+    return (
+      <div className={`cms-box cms-box--${box}`} key={box}>
+        <span className="cms-box__title">{box}</span>
+        <div className="cms-box__top">{cell(box, 'top', seen)}</div>
+        <div className="cms-box__left">{cell(box, 'left', seen)}</div>
+        <div className="cms-box__mid">{i + 1 < boxes.length ? render(i + 1) : <span className="cms-box__content">content</span>}</div>
+        <div className="cms-box__right">{cell(box, 'right', seen)}</div>
+        <div className="cms-box__bottom">{cell(box, 'bottom', seen)}</div>
+      </div>
+    )
+  }
+  return <div className="cms-boxmodel">{render(0)}</div>
+}
diff --git a/src/style/handles.ts b/src/style/handles.ts
new file mode 100644
index 0000000..617f713
--- /dev/null
+++ b/src/style/handles.ts
@@ -0,0 +1,177 @@
+// On-page spacing handles: pure geometry (rects in, handles out) and drag maths,
+// so it is testable without layout. The overlay component only draws these and
+// feeds pointer deltas back in.
+import { fieldForSide, gapField } from './model'
+import type { StyleField } from './model'
+
+export interface Rect {
+  x: number
+  y: number
+  w: number
+  h: number
+}
+export interface Box {
+  top: number
+  right: number
+  bottom: number
+  left: number
+}
+export type Edge = 'top' | 'right' | 'bottom' | 'left'
+
+export interface Handle {
+  id: string
+  kind: 'padding' | 'margin' | 'gap'
+  /** The coloured band showing the current size (viewport coordinates). */
+  band: Rect
+  /** The grab affordance, always GRIP px thick so a 0px value can still be grown. */
+  grip: Rect
+  axis: 'x' | 'y'
+  /** +1: dragging towards positive x/y grows it; -1: shrinks it. */
+  sign: 1 | -1
+  field: StyleField
+  /** Which CSS side/edge this handle sits on (for previews). */
+  edge: Edge | 'gap'
+  /** Current computed size in px. */
+  px: number
+  /** "padding top" / "gap": for the tooltip. */
+  label: string
+  /** True when the field covers more than this edge (editing "all sides"). */
+  shared: boolean
+}
+
+export const GRIP = 14
+
+/** Row/column gaps between a container's direct children, from their rects. */
+export function gapsBetween(children: Rect[]): Array<{ rect: Rect; axis: 'x' | 'y' }> {
+  const out: Array<{ rect: Rect; axis: 'x' | 'y' }> = []
+  const seen = new Set<string>()
+  const push = (rect: Rect, axis: 'x' | 'y') => {
+    const key = `${axis}:${Math.round(rect.x)}:${Math.round(rect.y)}:${Math.round(rect.w)}:${Math.round(rect.h)}`
+    if (rect.w > 0 && rect.h > 0 && !seen.has(key)) {
+      seen.add(key)
+      out.push({ rect, axis })
+    }
+  }
+  const overlapX = (a: Rect, b: Rect) => Math.min(a.x + a.w, b.x + b.w) - Math.max(a.x, b.x)
+  const overlapY = (a: Rect, b: Rect) => Math.min(a.y + a.h, b.y + b.h) - Math.max(a.y, b.y)
+  const sorted = [...children].sort((a, b) => a.y - b.y || a.x - b.x)
+  for (let i = 0; i < sorted.length; i++) {
+    for (let j = i + 1; j < sorted.length; j++) {
+      const a = sorted[i]
+      const b = sorted[j]
+      if (overlapX(a, b) > 0 && b.y >= a.y + a.h) {
+        // b sits below a in the same column: a horizontal band, but only for the nearest row
+        const blocked = sorted.some((c) => c !== a && c !== b && overlapX(a, c) > 0 && c.y >= a.y + a.h && c.y < b.y)
+        if (!blocked) push({ x: Math.max(a.x, b.x), y: a.y + a.h, w: overlapX(a, b), h: b.y - (a.y + a.h) }, 'y')
+      } else if (overlapY(a, b) > 0 && b.x >= a.x + a.w) {
+        const blocked = sorted.some((c) => c !== a && c !== b && overlapY(a, c) > 0 && c.x >= a.x + a.w && c.x < b.x)
+        if (!blocked) push({ x: a.x + a.w, y: Math.max(a.y, b.y), w: b.x - (a.x + a.w), h: overlapY(a, b) }, 'x')
+      }
+    }
+  }
+  return out
+}
+
+export interface HandleInput {
+  /** Border box of the block (viewport coordinates). */
+  rect: Rect
+  padding: Box
+  margin: Box
+  /** Rects of the direct children (cells), for gap bands. */
+  children: Rect[]
+  fields: StyleField[]
+}
+
+/** Only sides the schema can express get a handle (a node with no padding field gets none). */
+export function computeHandles({ rect, padding, margin, children, fields }: HandleInput): Handle[] {
+  const out: Handle[] = []
+  const edges: Edge[] = ['top', 'right', 'bottom', 'left']
+  for (const box of ['padding', 'margin'] as const) {
+    const sizes = box === 'padding' ? padding : margin
+    const inner = box === 'padding'
+    for (const edge of edges) {
+      const field = fieldForSide(fields, box, edge)
+      if (!field) continue
+      const px = Math.max(sizes[edge], 0)
+      const vertical = edge === 'top' || edge === 'bottom'
+      // The band is inside the border box for padding, outside it for margin.
+      let band: Rect
+      let free: number // coordinate of the band edge where the size "ends" (the drag handle sits here)
+      if (edge === 'top') {
+        band = inner ? { x: rect.x, y: rect.y, w: rect.w, h: px } : { x: rect.x, y: rect.y - px, w: rect.w, h: px }
+        free = inner ? rect.y + px : rect.y - px
+      } else if (edge === 'bottom') {
+        band = inner ? { x: rect.x, y: rect.y + rect.h - px, w: rect.w, h: px } : { x: rect.x, y: rect.y + rect.h, w: rect.w, h: px }
+        free = inner ? rect.y + rect.h - px : rect.y + rect.h + px
+      } else if (edge === 'left') {
+        band = inner ? { x: rect.x, y: rect.y, w: px, h: rect.h } : { x: rect.x - px, y: rect.y, w: px, h: rect.h }
+        free = inner ? rect.x + px : rect.x - px
+      } else {
+        band = inner ? { x: rect.x + rect.w - px, y: rect.y, w: px, h: rect.h } : { x: rect.x + rect.w, y: rect.y, w: px, h: rect.h }
+        free = inner ? rect.x + rect.w - px : rect.x + rect.w + px
+      }
+      const len = Math.min(48, vertical ? rect.w : rect.h)
+      const grip: Rect = vertical ? { x: rect.x + rect.w / 2 - len / 2, y: free - GRIP / 2, w: len, h: GRIP } : { x: free - GRIP / 2, y: rect.y + rect.h / 2 - len / 2, w: GRIP, h: len }
+      // Padding grows when its handle moves towards the middle of the box, margin when it moves away.
+      const towardsMiddle = edge === 'top' || edge === 'left' ? 1 : -1
+      const shared = field.side !== edge
+      out.push({
+        id: `${box}-${edge}`,
+        kind: box,
+        band,
+        grip,
+        axis: vertical ? 'y' : 'x',
+        sign: (inner ? towardsMiddle : -towardsMiddle) as 1 | -1,
+        field,
+        edge,
+        px,
+        label: `${box} ${field.side === 'all' ? '(all sides)' : shared ? `(${field.side})` : edge}`,
+        shared,
+      })
+    }
+  }
+  const gap = gapField(fields)
+  if (gap) {
+    for (const g of gapsBetween(children)) {
+      const vertical = g.axis === 'y'
+      const len = Math.min(48, vertical ? g.rect.w : g.rect.h)
+      const cx = g.rect.x + g.rect.w / 2
+      const cy = g.rect.y + g.rect.h / 2
+      out.push({
+        id: `gap-${g.axis}-${Math.round(g.rect.x)}-${Math.round(g.rect.y)}`,
+        kind: 'gap',
+        band: g.rect,
+        grip: vertical ? { x: cx - len / 2, y: cy - GRIP / 2, w: len, h: GRIP } : { x: cx - GRIP / 2, y: cy - len / 2, w: GRIP, h: len },
+        axis: g.axis,
+        sign: 1,
+        field: gap,
+        edge: 'gap',
+        px: vertical ? g.rect.h : g.rect.w,
+        label: 'gap',
+        shared: false,
+      })
+    }
+  }
+  return out
+}
+
+/** New size in px after the pointer moved by (dx, dy) from where the drag started. */
+export function dragPx(h: Pick<Handle, 'axis' | 'sign' | 'px'>, dx: number, dy: number): number {
+  return Math.max(0, h.px + h.sign * (h.axis === 'y' ? dy : dx))
+}
+
+/** CSS property used to live-preview a drag for a field. */
+export function previewProperty(f: StyleField, edge: Edge | 'gap'): string {
+  if (f.kind === 'gap') return 'gap'
+  const box = f.box ?? 'padding'
+  switch (f.side) {
+    case 'all':
+      return box
+    case 'x':
+      return `${box}-inline`
+    case 'y':
+      return `${box}-block`
+    default:
+      return `${box}-${f.side ?? (edge === 'gap' ? 'top' : edge)}`
+  }
+}
diff --git a/src/style/model.ts b/src/style/model.ts
new file mode 100644
index 0000000..31fd9f4
--- /dev/null
+++ b/src/style/model.ts
@@ -0,0 +1,141 @@
+// Style fields: which properties of a node type are *visual* controls, and which
+// visual dimension each one is. Driven by the schema annotation `x-style`
+// (see docs/styling.md), with a clearly separated fallback that infers the same
+// descriptor from the property name + enum for schemas that are not annotated
+// yet (e.g. the live site before the annotated schema is deployed).
+import type { JSONSchema } from '../api'
+import { resolveSchema } from '../form/resolve'
+
+export type StyleKind = 'spacing' | 'gap' | 'flow' | 'columns' | 'align' | 'justify' | 'tone' | 'border' | 'reveal' | 'choice'
+export type Side = 'all' | 'top' | 'bottom' | 'left' | 'right' | 'x' | 'y'
+export type Breakpoint = 'mobile' | 'tablet' | 'desktop'
+export const BREAKPOINTS: Breakpoint[] = ['mobile', 'tablet', 'desktop']
+
+export interface StyleField {
+  /** Property name in the node's data. */
+  name: string
+  kind: StyleKind
+  /** spacing only */
+  box?: 'padding' | 'margin'
+  side?: Side
+  /** This field wins over `overrides` for the sides it covers (paddingTop over padding). */
+  overrides?: string
+  /** CSS custom property template that resolves an enum value to a length, e.g. `--k6n-sp-{value}`. */
+  token?: string
+  options: unknown[]
+  min?: number
+  max?: number
+  label: string
+  description?: string
+  /** true when derived from naming conventions rather than an `x-style` annotation */
+  inferred: boolean
+  /** Breakpoints whose `responsive.<bp>` object declares the same property. */
+  responsive: Breakpoint[]
+}
+
+const SCALE = ['xs', 'sm', 'md', 'lg', 'xl']
+const isScale = (opts: unknown[]) => opts.includes('none') && SCALE.filter((x) => opts.includes(x)).length >= 3
+
+const SIDE_SUFFIX: Record<string, Side> = { Top: 'top', Bottom: 'bottom', Left: 'left', Right: 'right', X: 'x', Y: 'y', '': 'all' }
+
+const labelOf = (name: string) => name.replace(/([a-z])([A-Z])/g, '$1 $2').replace(/^./, (c) => c.toUpperCase())
+
+/** Fallback: the descriptor a property would carry if it were annotated, from its name and enum. */
+function infer(name: string, s: JSONSchema): Partial<StyleField> | null {
+  const opts = Array.isArray(s.enum) ? s.enum : []
+  const m = /^(padding|margin)(Top|Bottom|Left|Right|X|Y)?$/.exec(name)
+  if (m && isScale(opts)) {
+    const side = SIDE_SUFFIX[m[2] ?? '']
+    return { kind: 'spacing', box: m[1] as 'padding' | 'margin', side, overrides: side === 'all' ? undefined : m[1] }
+  }
+  if (name === 'gap' && isScale(opts)) return { kind: 'gap' }
+  if (name === 'flow' && opts.length) return { kind: 'flow' }
+  if (name === 'columns' && (s.type === 'integer' || s.type === 'number')) return { kind: 'columns' }
+  if (name === 'align' && opts.length) return { kind: 'align' }
+  if (name === 'justify' && opts.length) return { kind: 'justify' }
+  if (name === 'tone' && opts.length) return { kind: 'tone' }
+  if (name === 'border' && opts.length) return { kind: 'border' }
+  if (name === 'reveal' && opts.length) return { kind: 'reveal' }
+  return null
+}
+
+export function describeStyle(root: JSONSchema | undefined): StyleField[] {
+  if (!root) return []
+  const top = resolveSchema(root, root).schema
+  const props: Record<string, JSONSchema> = top.properties ?? {}
+  const bpProps = Object.fromEntries(
+    BREAKPOINTS.map((bp) => [bp, resolveSchema(root, resolveSchema(root, props.responsive).schema.properties?.[bp]).schema.properties ?? {}] as const),
+  ) as Record<Breakpoint, Record<string, JSONSchema>>
+
+  const out: StyleField[] = []
+  for (const [name, raw] of Object.entries(props)) {
+    const s = resolveSchema(root, raw).schema
+    const ann = s['x-style'] as Partial<StyleField> | undefined
+    const spec = ann?.kind ? ann : infer(name, s)
+    if (!spec?.kind) continue
+    out.push({
+      name,
+      kind: spec.kind,
+      box: spec.box,
+      side: spec.side ?? (spec.kind === 'spacing' ? 'all' : undefined),
+      overrides: spec.overrides,
+      token: spec.token,
+      options: Array.isArray(s.enum) ? s.enum : [],
+      min: s.minimum,
+      max: s.maximum,
+      label: s.title ?? labelOf(name),
+      description: s.description,
+      inferred: !ann?.kind,
+      responsive: BREAKPOINTS.filter((bp) => name in bpProps[bp]),
+    })
+  }
+  return out
+}
+
+/** Can blocks of this type be wrapped in it to style them? (`x-style.wrapper` on the schema root.) */
+export const isWrapperSchema = (root: JSONSchema | undefined) => !!root?.['x-style']?.wrapper
+
+// --- values ----------------------------------------------------------------------------
+
+type Data = Record<string, any>
+
+export function readField(data: Data, f: StyleField, bp?: Breakpoint): unknown {
+  return bp ? data.responsive?.[bp]?.[f.name] : data[f.name]
+}
+
+/** Effective value for a side, honouring `overrides` (paddingTop ?? padding). */
+export function effective(data: Data, fields: StyleField[], f: StyleField): { value: unknown; from: StyleField } {
+  const own = data[f.name]
+  if (own !== undefined && own !== null) return { value: own, from: f }
+  const base = f.overrides ? fields.find((x) => x.name === f.overrides) : undefined
+  if (base) {
+    const v = data[base.name]
+    if (v !== undefined && v !== null) return { value: v, from: base }
+  }
+  return { value: undefined, from: f }
+}
+
+/**
+ * The `set` payload that writes `value` to field `f` (clearing it when undefined).
+ * Base fields are a flat key; breakpoint overrides rebuild the whole `responsive` object,
+ * since `set` merges only at the top level.
+ */
+export function patchFor(data: Data, f: StyleField, value: unknown, bp?: Breakpoint): Record<string, unknown> {
+  if (!bp) return { [f.name]: value === undefined ? null : value }
+  const responsive = structuredClone(data.responsive ?? {}) as Record<string, Record<string, unknown>>
+  const cur = { ...(responsive[bp] ?? {}) }
+  if (value === undefined) delete cur[f.name]
+  else cur[f.name] = value
+  if (Object.keys(cur).length) responsive[bp] = cur
+  else delete responsive[bp]
+  return { responsive: Object.keys(responsive).length ? responsive : null }
+}
+
+/** Which field controls `side` of `box`: exact side, then x/y, then all. */
+export function fieldForSide(fields: StyleField[], box: 'padding' | 'margin', side: 'top' | 'bottom' | 'left' | 'right'): StyleField | undefined {
+  const axis: Side = side === 'top' || side === 'bottom' ? 'y' : 'x'
+  const mine = fields.filter((f) => f.kind === 'spacing' && f.box === box)
+  return mine.find((f) => f.side === side) ?? mine.find((f) => f.side === axis) ?? mine.find((f) => f.side === 'all')
+}
+
+export const gapField = (fields: StyleField[]) => fields.find((f) => f.kind === 'gap')
diff --git a/src/style/tokens.ts b/src/style/tokens.ts
new file mode 100644
index 0000000..763cfe1
--- /dev/null
+++ b/src/style/tokens.ts
@@ -0,0 +1,87 @@
+// Token scales: map the enum values of a spacing field ("md") to real pixels, and
+// snap a dragged distance back to the nearest token. Pixels come from the page's
+// own CSS (a hidden probe resolving `var(--k6n-sp-md)`), so the editor never
+// hard-codes a design system and fluid tokens (clamp/vw) measure correctly.
+import type { StyleField } from './model'
+
+export interface Scale {
+  values: string[]
+  /** px per value, or null when it could not be measured (then drags step ordinally). */
+  px: Array<number | null>
+}
+
+/** Dragging without px data: one token step per this many pixels. */
+export const ORDINAL_STEP_PX = 28
+
+/**
+ * Find the spacing custom-property prefix by scanning the page's stylesheets for `--<x>-sp-md`.
+ * Only a fallback for schemas without `x-style.token`.
+ */
+export function discoverSpacingVar(doc: Document): string | undefined {
+  for (const sheet of Array.from(doc.styleSheets)) {
+    let rules: CSSRuleList
+    try {
+      rules = sheet.cssRules
+    } catch {
+      continue // cross-origin sheet
+    }
+    for (const rule of Array.from(rules)) {
+      const style = (rule as CSSStyleRule).style
+      if (!style) continue
+      for (let i = 0; i < style.length; i++) {
+        const m = /^(--[\w-]*?-sp)-md$/.exec(style[i])
+        if (m) return `${m[1]}-{value}`
+      }
+    }
+  }
+  return undefined
+}
+
+export type Measure = (cssVar: string) => number | null
+
+/** Resolve a custom property to px with a throw-away probe element. */
+export function probeMeasure(doc: Document): Measure {
+  return (cssVar) => {
+    const probe = doc.createElement('div')
+    probe.style.cssText = `position:absolute;visibility:hidden;pointer-events:none;padding-left:var(${cssVar});`
+    doc.body.appendChild(probe)
+    const px = parseFloat(doc.defaultView!.getComputedStyle(probe).paddingLeft)
+    probe.remove()
+    return Number.isFinite(px) ? px : null
+  }
+}
+
+export function measureScale(field: StyleField, measure: Measure, doc?: Document): Scale {
+  const template = field.token ?? (doc ? discoverSpacingVar(doc) : undefined)
+  const values = field.options.map(String)
+  return { values, px: values.map((v) => (template ? measure(template.replace('{value}', v)) : null)) }
+}
+
+const measured = (s: Scale) => s.px.filter((p) => p !== null).length >= 2
+
+export const pxOf = (s: Scale, value: string): number | null => s.px[s.values.indexOf(value)] ?? null
+
+/**
+ * The token to use after dragging from `startValue` by `deltaPx` (positive = bigger).
+ * Measured scales snap to the nearest real size; unmeasured ones step ordinally.
+ */
+export function snap(scale: Scale, startValue: string | undefined, startPx: number, deltaPx: number): string {
+  const { values, px } = scale
+  if (measured(scale)) {
+    const target = Math.max(0, startPx + deltaPx)
+    let best = 0
+    let bestD = Infinity
+    px.forEach((p, i) => {
+      if (p === null) return
+      const d = Math.abs(p - target)
+      if (d < bestD) {
+        bestD = d
+        best = i
+      }
+    })
+    return values[best]
+  }
+  const from = Math.max(0, startValue ? values.indexOf(startValue) : 0)
+  const idx = Math.min(values.length - 1, Math.max(0, from + Math.round(deltaPx / ORDINAL_STEP_PX)))
+  return values[idx]
+}
diff --git a/src/ui/App.tsx b/src/ui/App.tsx
new file mode 100644
index 0000000..21d0cff
--- /dev/null
+++ b/src/ui/App.tsx
@@ -0,0 +1,31 @@
+import { useEffect } from 'react'
+import type { Controller } from '../controller'
+import { CtrlContext } from './hooks'
+import { Overlay } from './Overlay'
+import { Dock, Toast } from './Dock'
+import { Dialogs } from './Dialogs'
+import { Rail } from './Rail'
+import { LoginPanel } from './LoginPanel'
+import { DevPanel } from './DevPanel'
+
+export function App({ ctrl }: { ctrl: Controller }) {
+  useEffect(() => {
+    const onKey = (e: KeyboardEvent) => {
+      const t = e.target as HTMLElement
+      if (e.key === '`' && !t.isContentEditable && !/^(input|textarea|select)$/i.test(t.tagName)) ctrl.store.set((s) => ({ dev: !s.dev }))
+    }
+    document.addEventListener('keydown', onKey)
+    return () => document.removeEventListener('keydown', onKey)
+  }, [ctrl])
+  return (
+    <CtrlContext.Provider value={ctrl}>
+      <Overlay />
+      <Rail />
+      <Dialogs />
+      <DevPanel />
+      <LoginPanel />
+      <Dock />
+      <Toast />
+    </CtrlContext.Provider>
+  )
+}
diff --git a/src/ui/DevPanel.tsx b/src/ui/DevPanel.tsx
new file mode 100644
index 0000000..d3237b3
--- /dev/null
+++ b/src/ui/DevPanel.tsx
@@ -0,0 +1,79 @@
+import { useEffect, useState } from 'react'
+import type { CmsNode, JSONSchema } from '../api'
+import { blockEditors, fieldEditors, inlineEditors } from '../registry'
+import { Icon } from './Icon'
+import { useCtrl, useEditorState, useRegistryVersion } from './hooks'
+
+type Tab = 'requests' | 'selection' | 'registry'
+
+/** Developer panel: what the editor sent, what it knows, and what is registered. Toggle with ` (backtick). */
+export function DevPanel() {
+  const ctrl = useCtrl()
+  const open = useEditorState((s) => s.dev)
+  const [tab, setTab] = useState<Tab>('requests')
+  if (!open) return null
+  return (
+    <aside className="cms-dev" aria-label="Developer panel">
+      <header>
+        {(['requests', 'selection', 'registry'] as Tab[]).map((t) => (
+          <button key={t} className={t === tab ? 'is-on' : ''} onClick={() => setTab(t)}>
+            {t}
+          </button>
+        ))}
+        <button className="cms-ico" onClick={() => ctrl.store.set({ dev: false })} aria-label="Close developer panel">
+          <Icon name="close" />
+        </button>
+      </header>
+      <div className="cms-dev__body">{tab === 'requests' ? <Requests /> : tab === 'selection' ? <Selection /> : <Registry />}</div>
+    </aside>
+  )
+}
+
+function Requests() {
+  const log = useEditorState((s) => s.log)
+  const [open, setOpen] = useState<number | null>(null)
+  return (
+    <>
+      {[...log].reverse().map((e) => (
+        <div key={e.n} className="cms-log">
+          <button onClick={() => setOpen(open === e.n ? null : e.n)}>
+            <span className={`cms-status s${Math.floor(e.status / 100)}`}>{e.status || 'ERR'}</span> <b>{e.method}</b> {e.url} <i>{e.ms}ms</i>
+          </button>
+          {open === e.n && <pre>{JSON.stringify({ request: e.request, response: e.response }, null, 2)}</pre>}
+        </div>
+      ))}
+      {!log.length && <p className="cms-muted">No requests yet.</p>}
+    </>
+  )
+}
+
+function Selection() {
+  const ctrl = useCtrl()
+  const id = useEditorState((s) => s.selected)
+  const [data, setData] = useState<{ node: CmsNode; schema: JSONSchema } | null>(null)
+  useEffect(() => {
+    setData(null)
+    if (!id) return
+    void ctrl.node(id, true).then(async (node) => setData({ node, schema: await ctrl.schema(node.dataType) })).catch(() => {})
+  }, [id, ctrl])
+  if (!id) return <p className="cms-muted">Select a block.</p>
+  return data ? <pre>{JSON.stringify(data, null, 2)}</pre> : <p className="cms-muted">Loading {id}…</p>
+}
+
+function Registry() {
+  useRegistryVersion()
+  return (
+    <pre>
+      {JSON.stringify(
+        {
+          blockEditors: blockEditors.all().map((d) => ({ id: d.id, label: d.label, priority: d.priority ?? 0 })),
+          fieldEditors: fieldEditors.all().map((d) => d.id),
+          inlineEditors: inlineEditors.all().map((d) => d.id),
+          console: 'window.__cmsEditor.registerEditor({...})',
+        },
+        null,
+        2,
+      )}
+    </pre>
+  )
+}
diff --git a/src/ui/Dialogs.tsx b/src/ui/Dialogs.tsx
new file mode 100644
index 0000000..ee536f3
--- /dev/null
+++ b/src/ui/Dialogs.tsx
@@ -0,0 +1,69 @@
+import { useEffect, useRef, useState } from 'react'
+import type { DialogInstance } from '../controller'
+import { Icon } from './Icon'
+import { useCtrl, useEditorState } from './hooks'
+
+const WIDTH = { sm: 320, md: 420, lg: 620 }
+const BASE_Z = 2147483001
+
+export function Dialogs() {
+  const dialogs = useEditorState((s) => s.dialogs)
+  return (
+    <>
+      {dialogs.map((d, i) => (
+        <Dialog key={d.key} d={d} index={i} />
+      ))}
+    </>
+  )
+}
+
+/** Non-modal, draggable window: the page stays visible and clickable behind it. */
+function Dialog({ d, index }: { d: DialogInstance; index: number }) {
+  const ctrl = useCtrl()
+  const w = WIDTH[d.size]
+  const [pos, setPos] = useState(() => {
+    const x = Math.min((d.anchor?.x ?? 80) + 16, window.innerWidth - w - 12)
+    return { x: Math.max(12, x) + index * 18, y: Math.max(12, Math.min(d.anchor?.y ?? 80, window.innerHeight - 320)) + index * 18 }
+  })
+  const drag = useRef<{ dx: number; dy: number } | null>(null)
+  const el = useRef<HTMLElement>(null)
+  const [pulsing, setPulsing] = useState(false)
+
+  // Asked to open again: bring it back into view, flash it, and put the cursor in its first field.
+  useEffect(() => {
+    if (!d.pulse) return
+    setPos((p) => ({ x: Math.min(Math.max(8, p.x), Math.max(8, window.innerWidth - w - 8)), y: Math.min(Math.max(8, p.y), Math.max(8, window.innerHeight - 120)) }))
+    el.current?.querySelector<HTMLElement>('input:not([type=checkbox]), textarea, select, button:not([aria-label="Close"])')?.focus()
+    setPulsing(true)
+    const t = setTimeout(() => setPulsing(false), 700)
+    return () => clearTimeout(t)
+  }, [d.pulse, w])
+
+  return (
+    <section
+      ref={el}
+      className={`cms-dialog${pulsing ? ' is-pulsing' : ''}`}
+      style={{ left: pos.x, top: pos.y, width: w, zIndex: BASE_Z + d.z }}
+      role="dialog"
+      aria-label={d.title}
+      onPointerDownCapture={() => ctrl.raiseDialog(d.key)}
+    >
+      <header
+        className="cms-dialog__head"
+        onPointerDown={(e) => {
+          if ((e.target as HTMLElement).closest('button')) return
+          drag.current = { dx: e.clientX - pos.x, dy: e.clientY - pos.y }
+          e.currentTarget.setPointerCapture?.(e.pointerId)
+        }}
+        onPointerMove={(e) => drag.current && setPos({ x: e.clientX - drag.current.dx, y: Math.max(0, e.clientY - drag.current.dy) })}
+        onPointerUp={() => (drag.current = null)}
+      >
+        <strong>{d.title}</strong>
+        <button className="cms-ico" aria-label="Close" onClick={() => ctrl.closeDialog(d.key)}>
+          <Icon name="close" />
+        </button>
+      </header>
+      <div className="cms-dialog__body">{d.content}</div>
+    </section>
+  )
+}
diff --git a/src/ui/Dock.tsx b/src/ui/Dock.tsx
new file mode 100644
index 0000000..50886c4
--- /dev/null
+++ b/src/ui/Dock.tsx
@@ -0,0 +1,105 @@
+import { createElement, useEffect } from 'react'
+import { InsertPicker } from '../editors/builtin'
+import { Icon } from './Icon'
+import { useCtrl, useEditorState } from './hooks'
+
+export function Dock() {
+  const ctrl = useCtrl()
+  const s = useEditorState((s) => ({ mode: s.mode, canUndo: s.canUndo, canRedo: s.canRedo, busy: s.busy, dirty: s.dirty, rail: s.rail, dev: s.dev, auth: s.auth }))
+  const out = (
+    <button
+      className="cms-ico"
+      title="Leave preview mode"
+      aria-label="Leave preview mode"
+      onClick={() => {
+        document.cookie = 'cms_preview=; path=/; max-age=0'
+        location.reload()
+      }}
+    >
+      <Icon name="exit" />
+    </button>
+  )
+  if (s.auth.status !== 'signed-in') {
+    return (
+      <nav className="cms-dock" aria-label="Page editor">
+        <span className="cms-user">{s.auth.status === 'unknown' ? 'Checking session…' : 'Not signed in'}</span>
+        {out}
+      </nav>
+    )
+  }
+  const addToPage = async () => {
+    try {
+      const parentId = await ctrl.pageRoot()
+      let key = 0
+      key = ctrl.openDialog({ id: 'insert:page', title: 'Add to page', size: 'sm', content: createElement(InsertPicker, { parentId, ctrl, close: () => ctrl.closeDialog(key) }) })
+    } catch (e) {
+      ctrl.toast('error', (e as Error).message)
+    }
+  }
+  const rail = (which: 'outline' | 'blocks') => ctrl.store.set({ rail: s.rail === which ? null : which })
+  return (
+    <nav className="cms-dock" aria-label="Page editor">
+      <button className={`cms-pill${s.mode === 'edit' ? ' is-on' : ''}`} onClick={() => ctrl.setMode(s.mode === 'edit' ? 'browse' : 'edit')} title="Toggle editing (links work in browse mode)">
+        <Icon name={s.mode === 'edit' ? 'edit' : 'preview'} size={16} /> {s.mode === 'edit' ? 'Editing' : 'Browsing'}
+      </button>
+      <span className="cms-dock__sep" />
+      <button className="cms-ico" disabled={!s.canUndo} onClick={() => void ctrl.undo()} title="Undo (Ctrl+Z)" aria-label="Undo (Ctrl+Z)">
+        <Icon name="undo" />
+      </button>
+      <button className="cms-ico" disabled={!s.canRedo} onClick={() => void ctrl.redo()} title="Redo (Ctrl+Shift+Z)" aria-label="Redo (Ctrl+Shift+Z)">
+        <Icon name="redo" />
+      </button>
+      <span className="cms-dock__sep" />
+      <button className={`cms-ico${s.rail === 'blocks' ? ' is-on' : ''}`} onClick={() => rail('blocks')} title="Blocks: drag onto the page" aria-label="Blocks">
+        <Icon name="blocks" />
+      </button>
+      <button className={`cms-ico${s.rail === 'outline' ? ' is-on' : ''}`} onClick={() => rail('outline')} title="Outline" aria-label="Outline">
+        <Icon name="outline" />
+      </button>
+      <button className="cms-ico" onClick={() => void addToPage()} title="Add a block to the page" aria-label="Add a block to the page">
+        <Icon name="add" />
+      </button>
+      <span className={`cms-busy${s.busy ? ' is-busy' : ''}`} aria-live="polite" title={s.busy ? 'Saving…' : 'Saved'} />
+      <button className="cms-pill cms-pill--primary" onClick={() => void ctrl.publish()} title="Publish this page's static output">
+        <Icon name="publish" size={16} /> Publish{s.dirty ? ' •' : ''}
+      </button>
+      <span className="cms-dock__sep" />
+      <button className={`cms-ico${s.dev ? ' is-on' : ''}`} onClick={() => ctrl.store.set({ dev: !s.dev })} title="Developer panel (`)" aria-label="Developer panel">
+        <Icon name="settings" />
+      </button>
+      <button className="cms-ico" onClick={() => ctrl.signOut()} title={`Signed in as ${s.auth.user}. Click to sign out`} aria-label="Sign out">
+        <Icon name="sign-out" />
+      </button>
+      {out}
+    </nav>
+  )
+}
+
+export function Toast() {
+  const toast = useEditorState((s) => s.toast)
+  const ctrl = useCtrl()
+  useEffect(() => {
+    if (!toast) return
+    const t = setTimeout(() => ctrl.store.set({ toast: null }), toast.kind === 'error' ? 8000 : toast.action ? 6000 : 2500)
+    return () => clearTimeout(t)
+  }, [toast, ctrl])
+  if (!toast) return null
+  return (
+    <div className={`cms-toast cms-toast--${toast.kind}`} role="status" onClick={() => ctrl.store.set({ toast: null })}>
+      <Icon name={toast.kind === 'error' ? 'warning' : 'check'} size={16} />
+      <span>{toast.text}</span>
+      {toast.action && (
+        <button
+          className="cms-toast__action"
+          onClick={(e) => {
+            e.stopPropagation()
+            toast.action!.run()
+            ctrl.store.set({ toast: null })
+          }}
+        >
+          {toast.action.label}
+        </button>
+      )}
+    </div>
+  )
+}
diff --git a/src/ui/Icon.tsx b/src/ui/Icon.tsx
new file mode 100644
index 0000000..91aa0c1
--- /dev/null
+++ b/src/ui/Icon.tsx
@@ -0,0 +1,153 @@
+// Inline SVG icons (Material Design Icons paths via @mdi/js). Inline on purpose: an icon *font* would
+// need an @font-face in the page (they do not load from inside a shadow root), a network fetch and a
+// CSP exception; SVG paths are bundled, themeable via currentColor and tree-shaken to what is used.
+import {
+  mdiAlignHorizontalCenter,
+  mdiAlignHorizontalLeft,
+  mdiAlignHorizontalRight,
+  mdiArrowDown,
+  mdiArrowLeftRight,
+  mdiArrowUp,
+  mdiCheck,
+  mdiChevronRight,
+  mdiClose,
+  mdiCloudUploadOutline,
+  mdiCodeJson,
+  mdiCogOutline,
+  mdiContentCopy,
+  mdiDotsHorizontal,
+  mdiDragVertical,
+  mdiEyeOutline,
+  mdiFileTreeOutline,
+  mdiFlash,
+  mdiFormatAlignCenter,
+  mdiFormatAlignLeft,
+  mdiFormatAlignRight,
+  mdiFormatHeader1,
+  mdiFormatListBulleted,
+  mdiGestureTapButton,
+  mdiImageOutline,
+  mdiInformationOutline,
+  mdiLinkVariant,
+  mdiLogout,
+  mdiMagnify,
+  mdiPageLayoutFooter,
+  mdiPageLayoutHeader,
+  mdiPaletteOutline,
+  mdiPencilOutline,
+  mdiPlus,
+  mdiPlusBoxOutline,
+  mdiPower,
+  mdiRedo,
+  mdiRefresh,
+  mdiSelectGroup,
+  mdiShapeOutline,
+  mdiShapePlusOutline,
+  mdiText,
+  mdiTrashCanOutline,
+  mdiUndo,
+  mdiViewAgendaOutline,
+  mdiViewColumnOutline,
+  mdiViewDashboardOutline,
+  mdiViewGridOutline,
+  mdiAlertCircleOutline,
+  mdiContentSaveOutline,
+  mdiLoginVariant,
+  mdiOpenInNew,
+  mdiRestore,
+} from '@mdi/js'
+
+export const ICONS = {
+  edit: mdiPencilOutline,
+  preview: mdiEyeOutline,
+  add: mdiPlus,
+  'add-inside': mdiPlusBoxOutline,
+  duplicate: mdiContentCopy,
+  delete: mdiTrashCanOutline,
+  up: mdiArrowUp,
+  down: mdiArrowDown,
+  close: mdiClose,
+  undo: mdiUndo,
+  redo: mdiRedo,
+  outline: mdiFileTreeOutline,
+  blocks: mdiShapePlusOutline,
+  settings: mdiCogOutline,
+  exit: mdiPower,
+  'sign-out': mdiLogout,
+  style: mdiPaletteOutline,
+  wrap: mdiSelectGroup,
+  json: mdiCodeJson,
+  inspect: mdiMagnify,
+  more: mdiDotsHorizontal,
+  grip: mdiDragVertical,
+  chevron: mdiChevronRight,
+  publish: mdiCloudUploadOutline,
+  link: mdiLinkVariant,
+  check: mdiCheck,
+  refresh: mdiRefresh,
+  info: mdiInformationOutline,
+  warning: mdiAlertCircleOutline,
+  flash: mdiFlash,
+  save: mdiContentSaveOutline,
+  reset: mdiRestore,
+  'sign-in': mdiLoginVariant,
+  external: mdiOpenInNew,
+  // style kinds
+  'flow-row': mdiViewColumnOutline,
+  'flow-stack': mdiViewAgendaOutline,
+  'flow-actions': mdiArrowLeftRight,
+  'flow-grid': mdiViewGridOutline,
+  'align-start': mdiAlignHorizontalLeft,
+  'align-center': mdiAlignHorizontalCenter,
+  'align-end': mdiAlignHorizontalRight,
+  'text-left': mdiFormatAlignLeft,
+  'text-center': mdiFormatAlignCenter,
+  'text-right': mdiFormatAlignRight,
+  // node types
+  heading: mdiFormatHeader1,
+  text: mdiText,
+  button: mdiGestureTapButton,
+  image: mdiImageOutline,
+  layout: mdiViewDashboardOutline,
+  footer: mdiPageLayoutFooter,
+  header: mdiPageLayoutHeader,
+  list: mdiFormatListBulleted,
+  shape: mdiShapeOutline,
+} as const
+
+export type IconName = keyof typeof ICONS
+
+export function Icon({ name, size = 18, className, title, path }: { name?: IconName | string; size?: number; className?: string; title?: string; path?: string }) {
+  const d = path ?? (ICONS as Record<string, string>)[name ?? ''] ?? ICONS.shape
+  return (
+    <svg className={`cms-svg${className ? ` ${className}` : ''}`} width={size} height={size} viewBox="0 0 24 24" aria-hidden={title ? undefined : true} role={title ? 'img' : undefined} focusable="false">
+      {title && <title>{title}</title>}
+      <path d={d} fill="currentColor" />
+    </svg>
+  )
+}
+
+// --- node-type icons: extensible, with sensible guesses from the type name --------------------------
+
+const typeIcons = new Map<string, string>()
+/** Give a node type its own icon (an MDI path string), e.g. in a site-specific extension. */
+export const registerTypeIcon = (type: string, path: string) => void typeIcons.set(type, path)
+
+const GUESS: Array<[RegExp, IconName]> = [
+  [/heading|title|headline|typing/i, 'heading'],
+  [/button|cta|action/i, 'button'],
+  [/image|media|logo|photo|gallery/i, 'image'],
+  [/footer/i, 'footer'],
+  [/header|nav|menu/i, 'header'],
+  [/layout|grid|row|section|band|container|column/i, 'layout'],
+  [/list|points|faq|steps|stats|cards|items/i, 'list'],
+  [/text|prose|copy|statement|stream|quote|html/i, 'text'],
+]
+
+/** Icon for a node type (registered > guessed from the name > generic shape). */
+export function TypeIcon({ type, size = 16 }: { type: string; size?: number }) {
+  const custom = typeIcons.get(type)
+  if (custom) return <Icon path={custom} size={size} />
+  const name = GUESS.find(([re]) => re.test(type))?.[1] ?? 'shape'
+  return <Icon name={name} size={size} />
+}
diff --git a/src/ui/LoginPanel.tsx b/src/ui/LoginPanel.tsx
new file mode 100644
index 0000000..e61a3e3
--- /dev/null
+++ b/src/ui/LoginPanel.tsx
@@ -0,0 +1,71 @@
+import { useState } from 'react'
+import { Icon } from './Icon'
+import { Summary } from './Summary'
+import { useCtrl, useEditorState } from './hooks'
+
+/** Shown whenever there is no valid session: sign in with go-auth's device flow, or paste a token. */
+export function LoginPanel() {
+  const ctrl = useCtrl()
+  const auth = useEditorState((s) => s.auth)
+  const [token, setToken] = useState('')
+  const [busy, setBusy] = useState(false)
+  if (auth.status === 'signed-in' || auth.status === 'unknown') return null
+
+  if (auth.status === 'pending') {
+    return (
+      <section className="cms-login" role="dialog" aria-label="Approve sign-in">
+        <h3>Approve this sign-in</h3>
+        <p className="cms-muted">Check that the code below matches the one on the approval page.</p>
+        <div className="cms-code" aria-label="Device code">
+          {auth.userCode}
+        </div>
+        <a className="cms-btn cms-btn--primary cms-login__link" href={auth.verifyUrl} target="_blank" rel="noopener noreferrer">
+          <Icon name="external" size={16} /> Open approval page
+        </a>
+        <p className="cms-muted cms-waiting">
+          <span className="cms-spinner" /> Waiting for approval…
+        </p>
+        <button className="cms-btn" onClick={() => ctrl.auth.cancel()}>
+          Cancel
+        </button>
+      </section>
+    )
+  }
+
+  return (
+    <section className="cms-login" role="dialog" aria-label="Sign in">
+      <h3>Sign in to edit this page</h3>
+      <p className="cms-muted">You are viewing the page as a visitor. Sign in to switch to live preview and edit.</p>
+      {auth.error && (
+        <p className="cms-error" role="alert">
+          {auth.error}
+        </p>
+      )}
+      <button
+        className="cms-btn cms-btn--primary"
+        disabled={busy}
+        onClick={async () => {
+          setBusy(true)
+          await ctrl.signIn()
+          setBusy(false)
+        }}
+      >
+        <Icon name="sign-in" size={16} /> Sign in
+      </button>
+      <details className="cms-login__paste">
+        <Summary>Use an access token instead</Summary>
+        <form
+          onSubmit={(e) => {
+            e.preventDefault()
+            if (token.trim()) void ctrl.signInWithToken(token)
+          }}
+        >
+          <textarea className="cms-input cms-mono" rows={3} placeholder="Paste a bearer token" value={token} onChange={(e) => setToken(e.target.value)} spellCheck={false} />
+          <button className="cms-btn" type="submit" disabled={!token.trim()}>
+            Use token
+          </button>
+        </form>
+      </details>
+    </section>
+  )
+}
diff --git a/src/ui/Overlay.tsx b/src/ui/Overlay.tsx
new file mode 100644
index 0000000..15f85f2
--- /dev/null
+++ b/src/ui/Overlay.tsx
@@ -0,0 +1,270 @@
+import { createElement, useEffect, useRef, useState } from 'react'
+import type { Block } from '../controller'
+import { AttrEditor } from '../editors/AttrEditor'
+import { InsertPicker } from '../editors/builtin'
+import { getIn, parsePath } from '../page/infer'
+import { editorsFor } from '../registry'
+import { BoxHandles } from '../style/BoxHandles'
+import { describeStyle } from '../style/model'
+import { Icon, TypeIcon } from './Icon'
+import { useCtrl, useEditorState, useRegistryVersion } from './hooks'
+
+const rectOf = (el: HTMLElement) => el.getBoundingClientRect()
+
+/** Hover + selection frames drawn over the page, the selected block's toolbar, drop ghost, slots and chips. */
+export function Overlay() {
+  const { hovered, selected, mode, blocks } = useEditorState((s) => ({ hovered: s.hovered, selected: s.selected, mode: s.mode, blocks: s.blocks }))
+  useEditorState((s) => s.tick) // re-measure on scroll/resize/mutation
+  useRegistryVersion()
+  useEditorState((s) => s.schemasVersion)
+  useEditorState((s) => s.labelsVersion)
+  const ctrl = useCtrl()
+  const inline = useEditorState((s) => s.inline)
+  const signedIn = useEditorState((s) => s.auth.status === 'signed-in')
+  const drag = useEditorState((s) => s.drag)
+  if (mode !== 'edit' || !signedIn) return null
+  const sel = blocks.filter((b) => b.id === selected)
+  const hov = hovered && hovered !== selected ? blocks.filter((b) => b.id === hovered) : []
+  const idle = !inline && !drag
+  return (
+    <div className="cms-overlay">
+      {hov.map((b, i) => (
+        <Frame key={`h${b.id}-${i}`} el={b.el} kind="hover" type={b.type} title={ctrl.labelFor(b.id)} group={ctrl.groupOfType(b.type)} />
+      ))}
+      {sel.map((b, i) => (
+        <Frame key={`s${b.id}-${i}`} el={b.el} kind={inline ? 'editing' : 'selected'} type={b.type} />
+      ))}
+      {idle && sel[0] && <BoxHandles block={sel[0]} />}
+      {idle && <InsertSlots blocks={blocks} selected={selected} hovered={hovered} />}
+      {idle && sel[0] && <AttrChips />}
+      {idle && sel[0] && <ActionBar block={sel[0]} />}
+      {drag && <DropGhost />}
+    </div>
+  )
+}
+
+function Frame({ el, kind, type, title, group }: { el: HTMLElement; kind: string; type: string; title?: string; group?: string }) {
+  const r = rectOf(el)
+  return (
+    <div className={`cms-frame cms-frame--${kind}`} style={{ left: r.left, top: r.top, width: r.width, height: r.height }}>
+      {kind === 'hover' && (
+        <span className="cms-frame__tag">
+          <TypeIcon type={type} size={12} /> {title ?? type}
+          {title && <i> {type}</i>}
+          {group && group !== 'Other' && <em>{group}</em>}
+        </span>
+      )}
+    </div>
+  )
+}
+
+// --- toolbar ----------------------------------------------------------------------------------
+
+function ActionBar({ block }: { block: Block }) {
+  const ctrl = useCtrl()
+  const r = rectOf(block.el)
+  const defs = editorsFor(block)
+  const toolbar = defs.filter((d) => d.placement !== 'menu')
+  const menu = defs.filter((d) => d.placement === 'menu')
+  const [pos, setPos] = useState<{ index: number; count: number } | null>(null)
+  const [open, setOpen] = useState(false)
+  const menuRef = useRef<HTMLDivElement>(null)
+  useEffect(() => {
+    let live = true
+    setPos(null)
+    setOpen(false)
+    ctrl
+      .position(block.id)
+      .then((p) => live && setPos(p))
+      .catch(() => {})
+    return () => {
+      live = false
+    }
+  }, [block.id, ctrl, block.el])
+  useEffect(() => {
+    if (!open) return
+    const away = (e: Event) => !e.composedPath().includes(menuRef.current!) && setOpen(false)
+    document.addEventListener('pointerdown', away, true)
+    return () => document.removeEventListener('pointerdown', away, true)
+  }, [open])
+
+  const wrapper = ctrl.wrapperType()
+  const canWrap = !!wrapper && !!block.schema && block.type !== wrapper && describeStyle(block.schema).length === 0
+  const below = r.top < 48
+  const style = { left: Math.max(4, Math.min(r.left, window.innerWidth - 420)), top: below ? Math.min(r.bottom + 6, window.innerHeight - 44) : r.top - 42 }
+  return (
+    <div className="cms-bar" style={style} role="toolbar" aria-label={`${block.type} actions`}>
+      <span
+        className="cms-bar__type cms-bar__grip"
+        title="Drag to move"
+        aria-label="Drag to move"
+        onPointerDown={(e) => {
+          e.preventDefault()
+          ctrl.beginDrag(block.id)
+        }}
+      >
+        <Icon name="grip" size={16} />
+        <TypeIcon type={block.type} size={15} />
+        <span className="cms-bar__name" title={`${block.type} · ${ctrl.groupOfType(block.type)}`}>
+          {ctrl.labelFor(block.id) ?? block.type}
+        </span>
+      </span>
+      {toolbar.map((d) => (
+        <button key={d.id} className="cms-ico" title={d.label} aria-label={d.label} onClick={() => void ctrl.openEditor(d, block.id)}>
+          <Icon name={d.icon ?? 'edit'} />
+        </button>
+      ))}
+      {canWrap && (
+        <button className="cms-ico" title={`Add spacing & layout (wrap in ${wrapper})`} aria-label="Wrap in layout" onClick={() => void ctrl.wrapInLayout(block.id)}>
+          <Icon name="wrap" />
+        </button>
+      )}
+      <span className="cms-bar__sep" />
+      <button className="cms-ico" title="Move up" aria-label="Move up" disabled={!pos || pos.index <= 0} onClick={() => void ctrl.nudge(block.id, -1)}>
+        <Icon name="up" />
+      </button>
+      <button className="cms-ico" title="Move down" aria-label="Move down" disabled={!pos || pos.index >= pos.count - 1} onClick={() => void ctrl.nudge(block.id, 1)}>
+        <Icon name="down" />
+      </button>
+      <button className="cms-ico" title="Duplicate" aria-label="Duplicate" onClick={() => void ctrl.duplicate(block.id)}>
+        <Icon name="duplicate" />
+      </button>
+      <button className="cms-ico cms-ico--danger" title="Delete" aria-label="Delete" onClick={() => void ctrl.remove(block.id)}>
+        <Icon name="delete" />
+      </button>
+      <div className="cms-menuwrap" ref={menuRef}>
+        <button className={`cms-ico${open ? ' is-on' : ''}`} title="More" aria-label="More actions" aria-haspopup="menu" aria-expanded={open} onClick={() => setOpen((o) => !o)}>
+          <Icon name="more" />
+        </button>
+        {open && (
+          <div className="cms-menu" role="menu">
+            {menu.map((d) => (
+              <button
+                key={d.id}
+                role="menuitem"
+                onClick={() => {
+                  setOpen(false)
+                  void ctrl.openEditor(d, block.id)
+                }}
+              >
+                <Icon name={d.icon ?? 'edit'} size={16} /> {d.label}
+              </button>
+            ))}
+            <button
+              role="menuitem"
+              onClick={() => {
+                setOpen(false)
+                void navigator.clipboard?.writeText(block.id).then(() => ctrl.toast('info', 'Node id copied'))
+              }}
+            >
+              <Icon name="duplicate" size={16} /> Copy node id
+            </button>
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}
+
+// --- drop ghost: the "virtual element" that shows where a dragged / new block will land ---------
+
+function DropGhost() {
+  const drag = useEditorState((s) => s.drag)!
+  const t = drag.target
+  const vertical = !!t && t.line.h > t.line.w // a vertical line = siblings side by side
+  return (
+    <>
+      {t?.snaps?.map((r, i) => (
+        <div key={i} className={`cms-snap${r === t.line ? ' is-active' : ''}`} style={{ left: r.x, top: r.y, width: r.w, height: r.h }} />
+      ))}
+      {t && (
+        <>
+          <div className="cms-dropline" style={{ left: t.line.x, top: t.line.y, width: t.line.w, height: t.line.h }} />
+          <div className="cms-ghost" style={vertical ? { left: t.line.x + 10, top: t.line.y + Math.min(t.line.h / 2, 120) - 17, width: 130 } : { left: t.line.x, top: t.line.y + 6, width: Math.max(t.line.w, 120) }}>
+            <TypeIcon type={drag.type ?? drag.label} size={16} />
+            <span>{drag.source === 'palette' ? `New ${drag.label}` : `Move ${drag.label}`}</span>
+          </div>
+        </>
+      )}
+      {drag.pointer && (
+        <div className={`cms-dragchip${t ? '' : ' is-refused'}`} style={{ left: drag.pointer.x + 14, top: drag.pointer.y + 14 }}>
+          <TypeIcon type={drag.type ?? drag.label} size={14} /> {drag.label}
+          {!t ? ' · not here' : drag.source === 'block' ? (drag.nesting ? ' · nesting (release Alt to sort)' : t.snaps ? ' · sorting · Alt to nest' : '') : ''}
+        </div>
+      )}
+    </>
+  )
+}
+
+// --- insertion slots: "+" between a container's children (and inside an empty one) ----------------
+
+function InsertSlots({ blocks, selected, hovered }: { blocks: Block[]; selected: string | null; hovered: string | null }) {
+  const ctrl = useCtrl()
+  const containers = [selected, hovered].filter((id, i, a): id is string => !!id && a.indexOf(id) === i).map((id) => blocks.find((b) => b.id === id)).filter((b): b is Block => !!b && b.container)
+  const open = (parentId: string, index: number | undefined, x: number, y: number) => {
+    let key = 0
+    key = ctrl.openDialog({ id: `insert:${parentId}:${index ?? 'end'}`, title: 'Add block', size: 'sm', anchor: { x, y }, content: createElement(InsertPicker, { parentId, index, ctrl, close: () => ctrl.closeDialog(key) }) })
+  }
+  return (
+    <>
+      {containers.map((c) => {
+        const r = rectOf(c.el)
+        const kids = blocks.filter((b) => b.parentId === c.id).map((b) => ({ b, r: rectOf(b.el) }))
+        // Only vertical flows get between-slots; grids/rows would put the "+" in the wrong place.
+        const vertical = kids.every((k, i) => i === 0 || k.r.top >= kids[i - 1].r.bottom - 1)
+        if (!kids.length) {
+          return (
+            <button key={c.id} className="cms-slot cms-slot--empty" style={{ left: r.left + r.width / 2, top: r.top + Math.min(r.height / 2, 40) }} aria-label="Add block inside" onClick={() => open(c.id, undefined, r.left + r.width / 2, r.top)}>
+              <Icon name="add" size={16} /> Add block
+            </button>
+          )
+        }
+        const slots = vertical
+          ? [...kids.map((k, i) => ({ index: i, y: i === 0 ? k.r.top : (kids[i - 1].r.bottom + k.r.top) / 2 })), { index: kids.length, y: kids[kids.length - 1].r.bottom }]
+          : [{ index: kids.length, y: r.bottom }]
+        return slots.map((s) => (
+          <button key={`${c.id}-${s.index}`} className="cms-slot" style={{ left: r.left + r.width / 2, top: s.y }} aria-label={`Add block at position ${s.index + 1}`} title="Add block here" onClick={() => open(c.id, s.index, r.left + r.width / 2, s.y)}>
+            <Icon name="add" size={14} />
+          </button>
+        ))
+      })}
+    </>
+  )
+}
+
+// --- attribute chips: href / src / alt … of the selected block, editable where they are used ------------
+
+const ATTR_ICON: Record<string, string> = { href: 'link', src: 'image', alt: 'info', title: 'info' }
+
+function AttrChips() {
+  const ctrl = useCtrl()
+  const bindings = useEditorState((s) => s.bindings)
+  const selected = useEditorState((s) => s.selected)
+  return (
+    <>
+      {bindings.map((b) => {
+        if (!b.el.isConnected) return null
+        const r = rectOf(b.el)
+        return (
+          <button
+            key={`${b.path}:${b.attr}`}
+            className="cms-attrchip"
+            style={{ left: Math.max(4, r.right - 6), top: Math.max(4, r.top - 6) }}
+            title={`${b.attr}: ${b.value}`}
+            aria-label={`Edit ${b.attr}`}
+            onClick={async () => {
+              if (!selected) return
+              const node = await ctrl.node(selected, true)
+              const initial = String(getIn(node.data, parsePath(b.path)) ?? b.value)
+              let key = 0
+              const rr = b.el.getBoundingClientRect()
+              key = ctrl.openDialog({ id: `attr:${selected}:${b.path}`, title: `${b.attr} · ${b.path}`, size: 'sm', anchor: { x: rr.right, y: rr.top }, content: createElement(AttrEditor, { id: selected, path: b.path, attr: b.attr, initial, ctrl, close: () => ctrl.closeDialog(key) }) })
+            }}
+          >
+            <Icon name={ATTR_ICON[b.attr] ?? 'edit'} size={13} />
+          </button>
+        )
+      })}
+    </>
+  )
+}
diff --git a/src/ui/Rail.tsx b/src/ui/Rail.tsx
new file mode 100644
index 0000000..21a1187
--- /dev/null
+++ b/src/ui/Rail.tsx
@@ -0,0 +1,204 @@
+import { useEffect, useMemo, useRef, useState } from 'react'
+import type { Blueprint, TypeInfo } from '../api'
+import { OTHER_GROUP, allowedChildren, sortGroups, typeName } from '../schema'
+import { Icon, TypeIcon } from './Icon'
+import { Summary } from './Summary'
+import { useCtrl, useEditorState } from './hooks'
+
+/** Left rail: the page outline, and the palette of blocks you can drag onto the page. */
+export function Rail() {
+  const ctrl = useCtrl()
+  const rail = useEditorState((s) => s.rail)
+  if (!rail) return null
+  return (
+    <aside className="cms-rail" aria-label={rail === 'outline' ? 'Outline' : 'Blocks'}>
+      <header>
+        <div className="cms-tabs" role="tablist">
+          {(['outline', 'blocks'] as const).map((t) => (
+            <button key={t} role="tab" aria-selected={rail === t} className={rail === t ? 'is-on' : ''} onClick={() => ctrl.store.set({ rail: t })}>
+              <Icon name={t} size={16} /> {t === 'outline' ? 'Outline' : 'Blocks'}
+            </button>
+          ))}
+        </div>
+        <button className="cms-ico" onClick={() => ctrl.store.set({ rail: null })} aria-label="Close panel">
+          <Icon name="close" />
+        </button>
+      </header>
+      {rail === 'outline' ? <Outline /> : <Palette />}
+    </aside>
+  )
+}
+
+/** Page structure from the DOM scan: no API calls, always in sync with what is rendered. */
+function Outline() {
+  const ctrl = useCtrl()
+  const { blocks, selected } = useEditorState((s) => ({ blocks: s.blocks, selected: s.selected }))
+  useEditorState((s) => s.labelsVersion)
+  if (!blocks.length) return <p className="cms-muted cms-pad">No editable blocks on this page.</p>
+  return (
+    <ul className="cms-outline">
+      {blocks.map((b, i) => (
+        <li key={`${b.id}-${i}`}>
+          <button
+            className={b.id === selected ? 'is-sel' : ''}
+            style={{ paddingLeft: 8 + b.depth * 14 }}
+            onMouseEnter={() => ctrl.store.set({ hovered: b.id })}
+            onMouseLeave={() => ctrl.store.set({ hovered: null })}
+            onClick={() => {
+              ctrl.setMode('edit')
+              ctrl.select(b.id, { scroll: true })
+            }}
+          >
+            <TypeIcon type={b.type} size={15} />
+            {/* title (x-graph.label) when the type has one, otherwise the type name and a text snippet */}
+            {(() => {
+              const title = ctrl.labelFor(b.id)
+              return title ? (
+                <>
+                  <span className="cms-outline__type">{title}</span>
+                  <span className="cms-outline__text">{b.type}</span>
+                </>
+              ) : (
+                <>
+                  <span className="cms-outline__type">{b.type || '?'}</span>
+                  <span className="cms-outline__text">{(b.el.textContent ?? '').trim().slice(0, 40)}</span>
+                </>
+              )
+            })()}
+          </button>
+        </li>
+      ))}
+    </ul>
+  )
+}
+
+const DRAG_THRESHOLD = 5
+
+type Item = { key: string; label: string; /** the type id, shown under the title when it differs */ sub?: string; type?: string; blueprint?: string; group: string; description?: string }
+
+/**
+ * Every block type (and blueprint) that fits somewhere on this page. Drag one onto the page - a ghost
+ * shows where it will land, and containers that do not accept it refuse the drop - or click to add it
+ * to the selection (inside a container, otherwise after the selected block, otherwise at the page end).
+ */
+function Palette() {
+  const ctrl = useCtrl()
+  const [types, setTypes] = useState<TypeInfo[] | null>(null)
+  const [blueprints, setBlueprints] = useState<Blueprint[]>([])
+  const [q, setQ] = useState('')
+  const { selected, blocks } = useEditorState((s) => ({ selected: s.selected, blocks: s.blocks }))
+  const schemasVersion = useEditorState((s) => s.schemasVersion)
+  const suppressClick = useRef(false)
+
+  useEffect(() => {
+    void ctrl.api
+      .types()
+      .then((ts) => {
+        ctrl.ingestTypes(ts) // /api/types includes every schema: titles + groups with no further requests
+        setTypes(ts)
+        void ctrl.loadSchemas(ts.map(typeName)) // only for entries that arrived without a schema
+      })
+      .catch(() => setTypes([]))
+    void ctrl.api.blueprints().then(setBlueprints).catch(() => {})
+  }, [ctrl])
+
+  // Types some container on the page (or the page itself) can hold - the rest would only ever be refused.
+  const items = useMemo<Item[]>(() => {
+    if (!types) return []
+    const all = types.map(typeName).filter(Boolean)
+    const allowed = new Set<string>()
+    for (const b of blocks) if (b.container) allowedChildren(b.schema, all).forEach((t) => allowed.add(t))
+    const rootAllowed = !allowed.size // schemas not loaded yet: show everything rather than nothing
+    return [
+      ...types
+        .map((t) => ({ t, name: typeName(t) }))
+        .filter(({ name }) => name && !ctrl.isStaticRoot(name) && (rootAllowed || allowed.has(name)))
+        .map(({ name }) => {
+          const title = ctrl.typeTitle(name)
+          return { key: `t:${name}`, label: title, sub: title !== name ? name : undefined, type: name, group: ctrl.groupOfType(name), description: ctrl.schemaOf(name)?.description as string | undefined }
+        }),
+      ...blueprints.map((b) => ({ key: `b:${b.id}`, label: b.name ?? b.id, blueprint: b.id, group: 'Blueprints', description: b.description })),
+    ]
+  }, [types, blueprints, blocks, ctrl, schemasVersion])
+
+  const needle = q.toLowerCase()
+  const shown = items.filter((i) => i.label.toLowerCase().includes(needle) || (i.type ?? '').toLowerCase().includes(needle))
+  const groups = sortGroups(shown.map((i) => i.group).filter((g) => g !== 'Blueprints'))
+  if (shown.some((i) => i.group === 'Blueprints')) groups.push('Blueprints')
+
+  const addToSelection = async (item: Item) => {
+    const sel = ctrl.block(selected)
+    try {
+      let parent: string
+      let index: number | undefined
+      if (sel && sel.container && (!item.type || ctrl.accepts(sel.id, item.type))) parent = sel.id
+      else if (sel) {
+        parent = await ctrl.parentIdOf(sel.id)
+        index = (await ctrl.position(sel.id)).index + 1
+      } else parent = await ctrl.pageRoot()
+      if (item.blueprint) await ctrl.insertBlueprint(parent, item.blueprint, index)
+      else if (item.type) await ctrl.insert(parent, item.type, index !== undefined ? { index } : {})
+    } catch (e) {
+      ctrl.toast('error', (e as Error).message)
+    }
+  }
+
+  const onPointerDown = (e: React.PointerEvent, item: Item) => {
+    if (e.button !== 0) return
+    const x0 = e.clientX
+    const y0 = e.clientY
+    const doc = e.currentTarget.ownerDocument
+    const move = (m: PointerEvent) => {
+      if (Math.hypot(m.clientX - x0, m.clientY - y0) < DRAG_THRESHOLD) return
+      stop()
+      suppressClick.current = true
+      ctrl.setMode('edit')
+      ctrl.beginPaletteDrag({ type: item.type, blueprint: item.blueprint, label: item.label })
+    }
+    const stop = () => {
+      doc.removeEventListener('pointermove', move, true)
+      doc.removeEventListener('pointerup', stop, true)
+    }
+    doc.addEventListener('pointermove', move, true)
+    doc.addEventListener('pointerup', stop, true)
+  }
+
+  return (
+    <div className="cms-palette">
+      <div className="cms-pad">
+        <input className="cms-input" placeholder="Search blocks…" aria-label="Search blocks" value={q} onChange={(e) => setQ(e.target.value)} />
+        <p className="cms-muted cms-hint">Drag onto the page, or click to add to the selection.</p>
+      </div>
+      {!types && <p className="cms-muted cms-pad">Loading…</p>}
+      {groups.map((g) => (
+        <details key={g} className="cms-group-sec" open>
+          <Summary>
+            {g} <span className="cms-muted">{shown.filter((i) => i.group === g).length}</span>
+          </Summary>
+          <div className="cms-palette__grid">
+            {shown
+              .filter((i) => i.group === g)
+              .map((i) => (
+                <button
+                  key={i.key}
+                  className="cms-block"
+                  data-type={i.type}
+                  title={i.description ?? `Add ${i.label}`}
+                  onPointerDown={(e) => onPointerDown(e, i)}
+                  onClick={() => {
+                    if (suppressClick.current) return void (suppressClick.current = false)
+                    void addToSelection(i)
+                  }}
+                >
+                  <TypeIcon type={i.type ?? i.label} size={22} />
+                  <span>{i.label}</span>
+                  {i.sub && <small>{i.sub}</small>}
+                </button>
+              ))}
+          </div>
+        </details>
+      ))}
+      {types && !shown.length && <p className="cms-muted cms-pad">Nothing matches.</p>}
+    </div>
+  )
+}
diff --git a/src/ui/Summary.tsx b/src/ui/Summary.tsx
new file mode 100644
index 0000000..67ee58f
--- /dev/null
+++ b/src/ui/Summary.tsx
@@ -0,0 +1,12 @@
+import type { ReactNode } from 'react'
+import { Icon } from './Icon'
+
+/** `<summary>` with an icon chevron that rotates when the `<details>` is open (replaces the native text marker). */
+export function Summary({ children, className }: { children: ReactNode; className?: string }) {
+  return (
+    <summary className={className}>
+      <Icon name="chevron" size={16} className="cms-chev" />
+      {children}
+    </summary>
+  )
+}
diff --git a/src/ui/hooks.ts b/src/ui/hooks.ts
new file mode 100644
index 0000000..e2fd3c6
--- /dev/null
+++ b/src/ui/hooks.ts
@@ -0,0 +1,20 @@
+import { createContext, useContext, useSyncExternalStore } from 'react'
+import type { Controller, EditorState } from '../controller'
+import { useStore } from '../store'
+import { blockEditors, fieldEditors } from '../registry'
+
+export const CtrlContext = createContext<Controller>(null as never)
+export const useCtrl = () => useContext(CtrlContext)
+
+export function useEditorState<S>(select: (s: EditorState) => S): S {
+  return useStore(useCtrl().store, select)
+}
+
+export function useRegistryVersion(): number {
+  const subscribe = (f: () => void) => {
+    const a = blockEditors.subscribe(f)
+    const b = fieldEditors.subscribe(f)
+    return () => (a(), b())
+  }
+  return useSyncExternalStore(subscribe, () => blockEditors.version + fieldEditors.version)
+}
diff --git a/src/ui/styles.css b/src/ui/styles.css
new file mode 100644
index 0000000..621d013
--- /dev/null
+++ b/src/ui/styles.css
@@ -0,0 +1,275 @@
+:host { all: initial; }
+* { box-sizing: border-box; }
+.cms-root { font: 13px/1.4 Inter, system-ui, sans-serif; color: #e8e9ee; }
+button { font: inherit; color: inherit; cursor: pointer; }
+button:disabled { opacity: .35; cursor: default; }
+.cms-muted { color: #8b8fa0; margin: 4px 0; }
+.cms-error { color: #ff8a8a; }
+.cms-mono { font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 12px; }
+
+/* overlay frames never take pointer events: the page owns hit-testing */
+.cms-overlay { position: fixed; inset: 0; pointer-events: none; z-index: 2147483000; }
+.cms-frame { position: fixed; border: 1px solid #6aa7ff; background: rgba(106,167,255,.07); border-radius: 2px; }
+.cms-frame--selected { border: 2px solid #d2a24c; background: rgba(210,162,76,.08); }
+.cms-frame--editing { border: 2px dashed #5ee0a0; background: none; }
+.cms-frame__tag { position: absolute; top: -18px; left: -1px; padding: 1px 6px; font-size: 11px; background: #6aa7ff; color: #07080b; border-radius: 3px 3px 0 0; }
+
+.cms-bar, .cms-dock, .cms-dialog, .cms-outline, .cms-dev, .cms-toast {
+  pointer-events: auto; position: fixed; z-index: 2147483001;
+  background: #14161d; border: 1px solid #2a2d3a; border-radius: 10px; box-shadow: 0 8px 30px rgba(0,0,0,.45);
+}
+.cms-bar { display: flex; align-items: center; gap: 2px; padding: 3px 4px; border-radius: 8px; }
+.cms-bar__type { padding: 0 8px; color: #d2a24c; font-weight: 600; }
+.cms-bar__sep { width: 1px; height: 18px; background: #2a2d3a; margin: 0 3px; }
+.cms-ico { background: none; border: 0; border-radius: 6px; min-width: 28px; height: 28px; padding: 0 6px; }
+.cms-ico:hover:not(:disabled), .cms-pill:hover { background: #242836; }
+.cms-ico.is-on { background: #2b3350; }
+.cms-ico--danger:hover:not(:disabled) { background: #5a2330; }
+
+.cms-dock { left: 50%; bottom: 16px; transform: translateX(-50%); display: flex; align-items: center; gap: 4px; padding: 5px 8px; border-radius: 999px; }
+.cms-pill { background: none; border: 1px solid #2a2d3a; border-radius: 999px; padding: 4px 12px; height: 28px; }
+.cms-pill.is-on { background: #2b3350; border-color: #4a5a9a; }
+.cms-pill--primary { background: #d2a24c; border-color: #d2a24c; color: #07080b; font-weight: 600; }
+.cms-pill--primary:hover { background: #e0b25c; }
+.cms-busy { width: 8px; height: 8px; border-radius: 50%; background: #3b3f52; margin: 0 4px; }
+.cms-busy.is-busy { background: #5ee0a0; animation: cms-pulse .8s infinite alternate; }
+@keyframes cms-pulse { to { opacity: .2; } }
+
+.cms-dialog { max-height: calc(100vh - 24px); display: flex; flex-direction: column; }
+.cms-dialog__head { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px 6px 14px; border-bottom: 1px solid #2a2d3a; cursor: grab; user-select: none; }
+.cms-dialog__body { padding: 12px 14px; overflow: auto; }
+
+.cms-form { display: flex; flex-direction: column; gap: 10px; }
+.cms-field { display: flex; flex-direction: column; gap: 3px; }
+.cms-field__label { font-weight: 500; color: #c3c6d4; }
+.cms-field__label b { color: #ff8a8a; }
+.cms-field__hint { color: #8b8fa0; font-size: 11.5px; }
+.cms-input { width: 100%; background: #0c0d12; color: inherit; border: 1px solid #2a2d3a; border-radius: 6px; padding: 6px 8px; font: inherit; }
+.cms-input:focus { outline: 2px solid #4a5a9a; outline-offset: -1px; }
+.cms-input--area { resize: vertical; }
+.cms-input--bad { border-color: #ff6b6b; }
+.cms-check { width: 16px; height: 16px; }
+.cms-nested { border: 1px solid #2a2d3a; border-radius: 8px; padding: 8px; display: flex; flex-direction: column; gap: 10px; margin: 0; }
+.cms-extra summary { cursor: pointer; color: #8b8fa0; margin-bottom: 6px; }
+.cms-actions { display: flex; justify-content: flex-end; gap: 8px; position: sticky; bottom: 0; }
+.cms-btn { background: #242836; border: 1px solid #343850; border-radius: 6px; padding: 5px 14px; }
+.cms-btn--primary { background: #d2a24c; border-color: #d2a24c; color: #07080b; font-weight: 600; }
+
+.cms-picker h4 { margin: 10px 0 6px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: #8b8fa0; }
+.cms-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 6px; }
+.cms-tile { background: #1d2029; border: 1px solid #2a2d3a; border-radius: 8px; padding: 10px 8px; text-align: left; }
+.cms-tile:hover { border-color: #d2a24c; }
+
+.cms-dev header { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px 6px 12px; border-bottom: 1px solid #2a2d3a; }
+.cms-outline li button { display: flex; gap: 8px; width: 100%; background: none; border: 0; border-radius: 5px; padding: 3px 8px; text-align: left; overflow: hidden; white-space: nowrap; }
+.cms-outline li button:hover, .cms-outline li button.is-sel { background: #242836; }
+.cms-outline li button.is-sel { color: #d2a24c; }
+.cms-outline__type { font-weight: 600; }
+.cms-outline__text { color: #8b8fa0; overflow: hidden; text-overflow: ellipsis; }
+
+.cms-dev { right: 12px; top: 12px; bottom: 70px; width: 420px; display: flex; flex-direction: column; overflow: hidden; }
+.cms-dev header { justify-content: flex-start; gap: 4px; }
+.cms-dev header button:not(.cms-ico) { background: none; border: 0; padding: 4px 10px; border-radius: 6px; text-transform: capitalize; }
+.cms-dev header button.is-on { background: #2b3350; }
+.cms-dev header .cms-ico { margin-left: auto; }
+.cms-dev__body { overflow: auto; padding: 8px; }
+.cms-dev pre { margin: 4px 0; font: 11.5px/1.45 "JetBrains Mono", monospace; white-space: pre-wrap; word-break: break-all; color: #b9bdd0; }
+.cms-log > button { display: block; width: 100%; text-align: left; background: none; border: 0; padding: 3px 4px; font: 11.5px "JetBrains Mono", monospace; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
+.cms-log > button:hover { background: #1d2029; }
+.cms-log i { color: #8b8fa0; font-style: normal; }
+.cms-status { padding: 0 4px; border-radius: 3px; }
+.cms-status.s2 { background: #1f4d36; } .cms-status.s4, .cms-status.s5, .cms-status.s0 { background: #5a2330; }
+
+.cms-toast { left: 50%; bottom: 68px; transform: translateX(-50%); padding: 8px 14px; max-width: 80vw; cursor: pointer; }
+.cms-toast--error { border-color: #a33a4a; background: #2a1219; }
+
+.cms-bar__grip { cursor: grab; user-select: none; }
+.cms-bar__grip:active { cursor: grabbing; }
+.cms-dropline { position: fixed; background: #5ee0a0; border-radius: 2px; box-shadow: 0 0 0 2px rgba(94,224,160,.25); }
+.cms-user { padding: 0 10px; color: #8b8fa0; }
+.cms-toast__action { margin-left: 12px; background: none; border: 0; color: #d2a24c; font-weight: 600; text-decoration: underline; }
+
+.cms-login { pointer-events: auto; position: fixed; z-index: 2147483002; left: 50%; bottom: 72px; transform: translateX(-50%); width: 340px; max-width: calc(100vw - 24px);
+  background: #14161d; border: 1px solid #2a2d3a; border-radius: 12px; box-shadow: 0 12px 40px rgba(0,0,0,.5); padding: 16px 18px; display: flex; flex-direction: column; gap: 10px; }
+.cms-login h3 { margin: 0; font-size: 15px; }
+.cms-login p { margin: 0; }
+.cms-login__link { text-align: center; text-decoration: none; display: block; }
+.cms-login__paste summary { cursor: pointer; color: #8b8fa0; margin-bottom: 8px; }
+.cms-login__paste form { display: flex; flex-direction: column; gap: 8px; }
+.cms-code { font: 600 26px/1 "JetBrains Mono", monospace; letter-spacing: .14em; text-align: center; padding: 14px 0; background: #0c0d12; border: 1px dashed #4a5a9a; border-radius: 8px; user-select: all; }
+.cms-waiting { display: flex; align-items: center; gap: 8px; }
+.cms-spinner { width: 12px; height: 12px; border: 2px solid #3b3f52; border-top-color: #d2a24c; border-radius: 50%; animation: cms-spin .8s linear infinite; }
+@keyframes cms-spin { to { transform: rotate(360deg); } }
+@media (prefers-reduced-motion: reduce) { .cms-spinner, .cms-busy.is-busy { animation: none; } }
+
+/* form: arrays, maps, variants, groups */
+.cms-field.has-error > .cms-input, .cms-field.has-error .cms-input { border-color: #ff6b6b; }
+.cms-field__error { color: #ff8a8a; font-size: 11.5px; }
+.cms-inline { display: inline-flex; align-items: center; gap: 6px; }
+.cms-checks { display: flex; flex-wrap: wrap; gap: 6px 14px; }
+.cms-array, .cms-map, .cms-variant { display: flex; flex-direction: column; gap: 6px; }
+.cms-array__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
+.cms-item { border: 1px solid #2a2d3a; border-radius: 8px; background: #101219; }
+.cms-item.is-over { border-color: #5ee0a0; box-shadow: 0 0 0 2px rgba(94,224,160,.2); }
+.cms-item__head { display: flex; align-items: center; gap: 4px; padding: 3px 4px 3px 2px; }
+.cms-item__title { flex: 1; min-width: 0; text-align: left; background: none; border: 0; padding: 4px 6px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; border-radius: 6px; }
+.cms-item__title:hover { background: #1d2029; }
+.cms-item__value { flex: 1; min-width: 0; }
+.cms-item__actions { display: flex; flex-shrink: 0; }
+.cms-item__body { padding: 8px 10px 10px; border-top: 1px solid #2a2d3a; display: flex; flex-direction: column; gap: 10px; }
+.cms-object { display: flex; flex-direction: column; gap: 10px; }
+.cms-chev { display: inline-block; transition: transform .12s; color: #8b8fa0; }
+.cms-chev.is-open { transform: rotate(90deg); }
+.cms-grip { cursor: grab; color: #5b6075; padding: 0 4px; user-select: none; }
+.cms-array__foot { display: flex; align-items: center; gap: 10px; }
+.cms-map__row { display: flex; align-items: flex-start; gap: 6px; }
+.cms-map__key { width: 34%; flex-shrink: 0; padding-top: 6px; color: #c3c6d4; }
+input.cms-map__key { padding-top: 6px; }
+.cms-map__value { flex: 1; min-width: 0; }
+.cms-map__add { display: flex; gap: 6px; }
+.cms-group { border: 1px solid #2a2d3a; border-radius: 8px; padding: 6px 10px; }
+.cms-group > summary { cursor: pointer; font-weight: 600; padding: 2px 0; }
+.cms-group[open] > summary { margin-bottom: 8px; }
+.cms-group[open] { display: flex; flex-direction: column; gap: 10px; }
+.cms-readonly { margin: 0; padding: 6px 8px; background: #0c0d12; border-radius: 6px; font: 12px/1.4 "JetBrains Mono", monospace; white-space: pre-wrap; color: #9aa0b5; }
+.cms-thumb { max-width: 160px; max-height: 90px; object-fit: contain; border-radius: 6px; border: 1px solid #2a2d3a; }
+.cms-actions__note { margin-right: auto; align-self: center; }
+
+/* style: handles, bands, panel */
+.cms-band { position: fixed; pointer-events: none; }
+.cms-band--padding { background: rgba(110,231,160,.22); outline: 1px solid rgba(110,231,160,.5); }
+.cms-band--margin { background: rgba(243,168,95,.22); outline: 1px solid rgba(243,168,95,.5); }
+.cms-band--gap { background: rgba(180,140,255,.28); outline: 1px solid rgba(180,140,255,.55); }
+.cms-grip-h { position: fixed; pointer-events: auto; z-index: 2; border-radius: 99px; background: #fff; border: 2px solid currentColor; box-shadow: 0 1px 4px rgba(0,0,0,.4); touch-action: none; opacity: .85; }
+.cms-grip-h:hover, .cms-grip-h.is-active { opacity: 1; transform: scale(1.06); }
+.cms-grip-h--y { cursor: ns-resize; } .cms-grip-h--x { cursor: ew-resize; }
+.cms-grip-h--padding { color: #2fbf71; } .cms-grip-h--margin { color: #e8872b; } .cms-grip-h--gap { color: #9a6cf0; }
+.cms-tip { position: fixed; pointer-events: none; background: #14161d; border: 1px solid #2a2d3a; border-radius: 6px; padding: 3px 8px; font-size: 12px; white-space: nowrap; z-index: 3; }
+.cms-tip b { color: #d2a24c; }
+
+.cms-style { display: flex; flex-direction: column; gap: 14px; }
+.cms-style__section { display: flex; flex-direction: column; gap: 10px; }
+.cms-style__section h4 { margin: 0; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: #8b8fa0; }
+.cms-style__note { font-size: 11.5px; }
+.cms-tabs { display: flex; gap: 2px; border-bottom: 1px solid #2a2d3a; }
+.cms-tabs button { background: none; border: 0; border-bottom: 2px solid transparent; padding: 6px 10px; color: #8b8fa0; }
+.cms-tabs button.is-on { color: #e8e9ee; border-color: #d2a24c; }
+.cms-ctl { display: flex; flex-direction: column; gap: 4px; }
+.cms-ctl__head { display: flex; align-items: center; justify-content: space-between; }
+.cms-ctl__label { color: #c3c6d4; font-weight: 500; }
+.cms-ctl__clear { background: none; border: 0; color: #8b8fa0; padding: 0 4px; }
+.cms-ctl__clear:hover { color: #e8e9ee; }
+.cms-chips { display: flex; flex-wrap: wrap; gap: 4px; }
+.cms-chip { background: #1d2029; border: 1px solid #2a2d3a; border-radius: 6px; padding: 4px 9px; }
+.cms-chip:hover { border-color: #4a5a9a; }
+.cms-chip.is-on { background: #2b3350; border-color: #6a7fe0; color: #fff; }
+.cms-stepper { display: flex; align-items: center; gap: 4px; }
+.cms-stepper .cms-input { width: 64px; text-align: center; }
+
+.cms-boxmodel { display: flex; justify-content: center; }
+.cms-box { display: grid; grid-template-columns: 74px 1fr 74px; grid-template-rows: auto auto auto; gap: 4px; padding: 6px; border-radius: 8px; position: relative; width: 100%; }
+.cms-box--margin { background: rgba(243,168,95,.12); border: 1px dashed rgba(243,168,95,.55); }
+.cms-box--padding { background: rgba(110,231,160,.12); border: 1px dashed rgba(110,231,160,.55); }
+.cms-box__title { position: absolute; top: 2px; left: 8px; font-size: 10px; text-transform: uppercase; letter-spacing: .08em; color: #8b8fa0; }
+.cms-box__top { grid-column: 2; grid-row: 1; text-align: center; padding-top: 10px; }
+.cms-box__bottom { grid-column: 2; grid-row: 3; text-align: center; }
+.cms-box__left { grid-column: 1; grid-row: 2; align-self: center; }
+.cms-box__right { grid-column: 3; grid-row: 2; align-self: center; text-align: right; }
+.cms-box__mid { grid-column: 2; grid-row: 2; min-width: 0; }
+.cms-box__content { display: block; text-align: center; padding: 14px 0; border-radius: 6px; background: #0c0d12; color: #5b6075; font-size: 11px; }
+.cms-box__sel { width: 100%; background: #0c0d12; color: inherit; border: 1px solid #2a2d3a; border-radius: 6px; padding: 3px 4px; font: inherit; }
+.cms-box__sel.is-inherited { color: #8b8fa0; }
+.cms-box__link, .cms-box__none { color: #5b6075; font-size: 11px; }
+
+/* ---- polish: icons, toolbar, menu, rail, palette, drag ---- */
+:host { --cms-accent: #d2a24c; --cms-line: #2a2d3a; --cms-panel: #14161d; }
+.cms-svg { display: block; flex-shrink: 0; }
+.cms-ico { display: inline-flex; align-items: center; justify-content: center; gap: 4px; color: #c9ccda; transition: background .12s, color .12s; }
+.cms-ico:hover:not(:disabled) { color: #fff; }
+.cms-ico.is-on { color: var(--cms-accent); }
+.cms-bar { padding: 4px 6px; gap: 2px; border-radius: 10px; backdrop-filter: blur(6px); }
+.cms-bar__type { display: inline-flex; align-items: center; gap: 6px; padding: 0 10px 0 4px; height: 28px; color: var(--cms-accent); font-weight: 600; border-radius: 6px; }
+.cms-bar__type:hover { background: #242836; }
+.cms-bar__sep, .cms-dock__sep { width: 1px; height: 18px; background: var(--cms-line); margin: 0 4px; }
+.cms-frame__tag { display: inline-flex; align-items: center; gap: 4px; }
+.cms-frame--selected::after { content: ''; position: absolute; inset: -2px; border-radius: 3px; box-shadow: 0 0 0 4px rgba(210,162,76,.18); pointer-events: none; }
+
+.cms-dock { padding: 6px 10px; gap: 2px; box-shadow: 0 10px 40px rgba(0,0,0,.5); }
+.cms-pill { display: inline-flex; align-items: center; gap: 6px; }
+.cms-toast { display: flex; align-items: center; gap: 8px; }
+.cms-toast--error svg { color: #ff8a8a; } .cms-toast svg { color: #5ee0a0; }
+.cms-chip { display: inline-flex; align-items: center; gap: 6px; }
+.cms-tile { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
+.cms-tile svg { color: var(--cms-accent); }
+
+.cms-menuwrap { position: relative; }
+.cms-menu { position: absolute; right: 0; top: calc(100% + 8px); min-width: 180px; background: var(--cms-panel); border: 1px solid var(--cms-line); border-radius: 10px; box-shadow: 0 12px 36px rgba(0,0,0,.55); padding: 4px; display: flex; flex-direction: column; z-index: 5; }
+.cms-menu button { display: flex; align-items: center; gap: 10px; background: none; border: 0; text-align: left; padding: 7px 10px; border-radius: 6px; white-space: nowrap; }
+.cms-menu button:hover { background: #242836; }
+
+/* drag: ghost = the virtual element showing where the block lands */
+.cms-ghost { position: fixed; display: flex; align-items: center; gap: 8px; height: 34px; padding: 0 12px; border: 2px dashed #5ee0a0; border-radius: 8px; background: rgba(94,224,160,.14); color: #bff5d9; font-weight: 600; pointer-events: none; box-shadow: 0 6px 24px rgba(0,0,0,.35); animation: cms-pop .12s ease-out; }
+@keyframes cms-pop { from { transform: scale(.97); opacity: 0; } }
+.cms-dragchip { position: fixed; display: inline-flex; align-items: center; gap: 6px; background: var(--cms-panel); border: 1px solid #5ee0a0; border-radius: 999px; padding: 3px 10px; font-size: 12px; pointer-events: none; z-index: 4; }
+.cms-dragchip.is-refused { border-color: #a33a4a; color: #ff8a8a; }
+
+/* insertion slots */
+.cms-slot { position: fixed; pointer-events: auto; transform: translate(-50%, -50%); display: inline-flex; align-items: center; gap: 4px; min-width: 22px; height: 22px; padding: 0 3px; border-radius: 999px; border: 1px solid #4a5a9a; background: #2b3350; color: #dfe5ff; opacity: .0; transition: opacity .12s, transform .12s; z-index: 1; }
+.cms-overlay:hover .cms-slot, .cms-slot:focus-visible, .cms-slot--empty { opacity: .9; }
+.cms-slot:hover { opacity: 1; transform: translate(-50%, -50%) scale(1.12); background: #3a4672; }
+.cms-slot--empty { padding: 0 12px; height: 30px; border-style: dashed; background: rgba(43,51,80,.85); }
+
+.cms-attrchip { position: fixed; pointer-events: auto; transform: translate(-100%, -100%); display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; border-radius: 999px; border: 1px solid #5ee0a0; background: #14161d; color: #5ee0a0; z-index: 1; }
+.cms-attrchip:hover { background: #1f3a2e; }
+
+/* left rail: outline + block palette */
+.cms-rail { pointer-events: auto; position: fixed; z-index: 2147483001; left: 12px; top: 12px; bottom: 76px; width: 280px; display: flex; flex-direction: column; overflow: hidden; background: var(--cms-panel); border: 1px solid var(--cms-line); border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,.5); }
+.cms-rail > header { display: flex; align-items: center; justify-content: space-between; padding: 4px 6px 0 6px; border-bottom: 1px solid var(--cms-line); }
+.cms-rail .cms-tabs { border: 0; } .cms-rail .cms-tabs button { display: inline-flex; align-items: center; gap: 6px; }
+.cms-pad { padding: 10px 12px 4px; }
+.cms-hint { font-size: 11.5px; margin-top: 6px; }
+.cms-outline { list-style: none; margin: 0; padding: 4px; overflow: auto; }
+.cms-outline li button { display: flex; align-items: center; gap: 8px; width: 100%; background: none; border: 0; border-radius: 6px; padding: 4px 8px; text-align: left; overflow: hidden; white-space: nowrap; }
+.cms-outline li button:hover, .cms-outline li button.is-sel { background: #242836; }
+.cms-outline li button.is-sel { color: var(--cms-accent); }
+.cms-outline__type { font-weight: 600; } .cms-outline__text { color: #8b8fa0; overflow: hidden; text-overflow: ellipsis; }
+.cms-palette { overflow: auto; padding-bottom: 12px; }
+.cms-palette h4 { margin: 10px 12px 6px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: #8b8fa0; }
+.cms-palette__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; padding: 0 10px; }
+.cms-block { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 12px 6px 8px; background: #1a1d26; border: 1px solid var(--cms-line); border-radius: 10px; cursor: grab; touch-action: none; user-select: none; text-align: center; }
+.cms-block svg { color: var(--cms-accent); } .cms-block span { font-size: 12px; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
+.cms-block:hover { border-color: #4a5a9a; background: #20243a; }
+.cms-block:active { cursor: grabbing; }
+.cms-dev header .cms-ico { margin-left: auto; }
+
+/* sort snapping: faint markers at every candidate position, the active one animates between them */
+.cms-snap { position: fixed; pointer-events: none; background: rgba(94,224,160,.28); border-radius: 2px; }
+.cms-snap.is-active { background: transparent; }
+.cms-dropline { transition: left .09s ease-out, top .09s ease-out, width .09s ease-out, height .09s ease-out; }
+@media (prefers-reduced-motion: reduce) { .cms-dropline { transition: none; } }
+
+/* titles + groups */
+.cms-frame__tag i { font-style: normal; opacity: .7; font-weight: 400; }
+.cms-frame__tag em { font-style: normal; margin-left: 6px; padding: 0 5px; border-radius: 99px; background: rgba(7,8,11,.25); font-size: 10px; }
+.cms-bar__name { max-width: 190px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.cms-group-sec > summary { cursor: pointer; list-style: none; margin: 10px 12px 6px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: #8b8fa0; display: flex; gap: 8px; align-items: center; }
+.cms-group-sec > summary::-webkit-details-marker { display: none; }
+
+.cms-block small, .cms-tile small { display: block; font-size: 10.5px; color: #8b8fa0; font-family: "JetBrains Mono", monospace; max-width: 100%; overflow: hidden; text-overflow: ellipsis; }
+.cms-tile span { font-weight: 500; }
+
+/* disclosure chevrons are icons now (rotate when open) */
+summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 4px; }
+summary::-webkit-details-marker { display: none; }
+summary .cms-chev { transition: transform .12s; color: #8b8fa0; }
+details[open] > summary > .cms-chev { transform: rotate(90deg); }
+.cms-box__link { display: inline-flex; align-items: center; gap: 3px; }
+.cms-item__head .cms-ico, .cms-map__row .cms-ico { padding: 0 4px; }
+.cms-grip { display: inline-flex; align-items: center; }
+
+.cms-btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; }
+
+/* a dialog asked for again: flash it instead of opening a duplicate */
+.cms-dialog.is-pulsing { animation: cms-pulse-ring .7s ease-out; }
+@keyframes cms-pulse-ring { 0% { box-shadow: 0 0 0 0 rgba(210,162,76,.9), 0 8px 30px rgba(0,0,0,.45); } 100% { box-shadow: 0 0 0 14px rgba(210,162,76,0), 0 8px 30px rgba(0,0,0,.45); } }
+@media (prefers-reduced-motion: reduce) { .cms-dialog.is-pulsing { animation: none; outline: 2px solid #d2a24c; } }
diff --git a/test/auth.test.tsx b/test/auth.test.tsx
new file mode 100644
index 0000000..20ce54b
--- /dev/null
+++ b/test/auth.test.tsx
@@ -0,0 +1,188 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+import { AuthManager } from '../src/auth'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+const until = async (cond: () => boolean, ms = 1500) => {
+  const t0 = Date.now()
+  while (!cond()) {
+    if (Date.now() - t0 > ms) throw new Error('timed out waiting')
+    await act(async () => void (await new Promise((r) => setTimeout(r, 10))))
+  }
+}
+const status = () => h.editor.ctrl.store.get().auth.status
+const signIn = async () => {
+  await until(() => status() === 'signed-out')
+  await act(async () => void h.shadow.querySelector<HTMLElement>('[aria-label="Sign in"] .cms-btn--primary')!.click())
+  await until(() => status() === 'pending')
+  h.cms.approve()
+  await until(() => status() === 'signed-in')
+  await h.settle()
+}
+
+describe('sign-in (device grant)', () => {
+  it('shows the login panel and blocks editing while signed out', async () => {
+    h = await setup({ auth: true })
+    await until(() => status() === 'signed-out')
+    expect(h.shadow.querySelector('[aria-label="Sign in"]')).not.toBeNull()
+    await act(async () => void click(byId('t1')))
+    expect(h.editor.ctrl.store.get().selected).toBeNull()
+    const ev = new MouseEvent('click', { bubbles: true, cancelable: true })
+    byId('b1').querySelector('a')!.dispatchEvent(ev)
+    expect(ev.defaultPrevented).toBe(false) // the page behaves like a normal page
+  })
+
+  it('walks through user code -> approval -> signed in, then editing works', async () => {
+    h = await setup({ auth: true })
+    await until(() => status() === 'signed-out')
+    await act(async () => void h.shadow.querySelector<HTMLElement>('[aria-label="Sign in"] .cms-btn--primary')!.click())
+    await until(() => status() === 'pending')
+    expect(h.shadow.querySelector('.cms-code')!.textContent).toBe('MOCK-1234')
+    expect(h.shadow.querySelector<HTMLAnchorElement>('.cms-login__link')!.href).toContain('/device?user_code=MOCK-1234')
+    h.cms.approve()
+    await until(() => status() === 'signed-in')
+    await h.settle()
+    expect(h.shadow.querySelector('[aria-label="Sign in"]')).toBeNull()
+    expect(h.editor.ctrl.store.get().toast!.text).toBe('Signed in as mock-user')
+    await act(async () => void click(byId('t1')))
+    expect(h.editor.ctrl.store.get().selected).toBe('t1')
+  })
+
+  it('refreshes transparently when the access token expires', async () => {
+    h = await setup({ auth: true })
+    await signIn()
+    const before = h.auth.headers().Authorization
+    h.cms.expireAccess()
+    await act(async () => void click(byId('t1')))
+    await h.editor.ctrl.nudge('t1', 1)
+    await h.settle()
+    expect(h.cms.graph.children('s1').map((e) => e.to)).toEqual(['h1', 'b1', 't1'])
+    expect(h.auth.headers().Authorization).not.toBe(before) // a new access token was minted via the refresh token
+    expect(status()).toBe('signed-in')
+  })
+
+  it('a revoked session drops back to the login panel', async () => {
+    h = await setup({ auth: true })
+    await signIn()
+    await act(async () => void click(byId('t1')))
+    h.cms.revoke()
+    await h.editor.ctrl.nudge('t1', 1)
+    await h.settle()
+    expect(status()).toBe('signed-out')
+    expect(h.editor.ctrl.store.get().selected).toBeNull()
+    expect(h.shadow.querySelector('[aria-label="Sign in"]')).not.toBeNull()
+  })
+
+  it('sign out clears the session; pasted tokens work', async () => {
+    h = await setup({ auth: true, token: 'static-token' })
+    await until(() => status() === 'signed-out')
+    await h.editor.ctrl.signInWithToken('static-token')
+    await h.settle()
+    expect(status()).toBe('signed-in')
+    h.editor.ctrl.signOut()
+    expect(status()).toBe('signed-out')
+  })
+})
+
+describe('AuthManager', () => {
+  const json = (status: number, body: unknown) => new Response(JSON.stringify(body), { status })
+  const grant = { device_code: 'd', user_code: 'U', verification_uri: 'https://i/device', interval: 1, expires_in: 600 }
+
+  function manager(poll: Array<Response>, extra: Partial<ConstructorParameters<typeof AuthManager>[0]> = {}) {
+    const sleeps: number[] = []
+    const calls: string[] = []
+    const fetch = (async (url: string) => {
+      calls.push(String(url))
+      if (String(url).endsWith('/api/auth/device')) return json(200, grant)
+      if (String(url).endsWith('/device/token')) return poll.shift()!
+      throw new Error('unexpected ' + url)
+    }) as unknown as typeof globalThis.fetch
+    const auth = new AuthManager({ fetch, issuer: async () => 'https://i', persistent: null, session: null, sleep: async (ms) => void sleeps.push(ms), ...extra })
+    return { auth, sleeps, calls }
+  }
+
+  it('honours slow_down by backing off 5s', async () => {
+    const { auth, sleeps } = manager([json(400, { error: 'authorization_pending' }), json(400, { error: 'slow_down' }), json(400, { error: 'authorization_pending' }), json(200, { access_token: 'a', refresh_token: 'r', expires_in: 900 })])
+    expect(await auth.login()).toBe(true)
+    expect(sleeps).toEqual([1000, 1000, 6000, 6000])
+    expect(auth.headers()).toEqual({ Authorization: 'Bearer a' })
+  })
+
+  it('runs the grant as the CMS client from /api/auth/config so the token audience matches', async () => {
+    const bodies: string[] = []
+    const fetch = (async (url: string, init?: RequestInit) => {
+      const u = String(url)
+      if (u === '/api/auth/config') return json(200, { issuer: 'https://i', clientId: 'k6n-admin' })
+      bodies.push(`${u.replace('https://i', '')} ${String(init?.body)}`)
+      if (u.endsWith('/api/auth/device')) return json(200, grant)
+      return json(200, { access_token: 'a', expires_in: 900 })
+    }) as unknown as typeof globalThis.fetch
+    const auth = new AuthManager({ fetch, persistent: null, session: null, sleep: async () => {} })
+    expect(await auth.login()).toBe(true)
+    expect(bodies[0]).toContain('client_id=k6n-admin') // start
+    expect(bodies[1]).toContain('client_id=k6n-admin') // poll: must be the same client
+  })
+
+  it('surfaces the server reason (e.g. wrong audience) when a token is rejected', async () => {
+    const fetch = (async () => json(401, { error: 'unauthorized: oidc: wrong audience' })) as unknown as typeof globalThis.fetch
+    const auth = new AuthManager({ fetch, persistent: null, session: null })
+    auth.useToken('t')
+    await auth.check(async () => {
+      throw Object.assign(new Error('unauthorized: oidc: wrong audience'), { status: 401 })
+    })
+    expect(auth.state.get()).toMatchObject({ status: 'signed-out', error: expect.stringContaining('wrong audience') })
+  })
+
+  it('reports denial and expiry', async () => {
+    const denied = manager([json(400, { error: 'access_denied' })])
+    expect(await denied.auth.login()).toBe(false)
+    expect(denied.auth.state.get()).toMatchObject({ status: 'signed-out', error: 'sign-in was denied' })
+    const expired = manager([json(400, { error: 'expired_token' })])
+    await expired.auth.login()
+    expect(expired.auth.state.get().error).toMatch(/expired/)
+  })
+
+  it('cancel stops polling quietly', async () => {
+    let auth!: AuthManager
+    const m = manager([json(400, { error: 'authorization_pending' }), json(400, { error: 'authorization_pending' })], { sleep: async () => auth.cancel() })
+    auth = m.auth
+    expect(await auth.login()).toBe(false)
+    expect(auth.state.get()).toMatchObject({ status: 'signed-out', error: undefined })
+  })
+
+  it('production keeps the refresh token out of localStorage', async () => {
+    const mk = () => {
+      const m = new Map<string, string>()
+      return { getItem: (k: string) => m.get(k) ?? null, setItem: (k: string, v: string) => void m.set(k, v), removeItem: (k: string) => void m.delete(k), data: m } as unknown as Storage & { data: Map<string, string> }
+    }
+    for (const persistRefresh of [false, true]) {
+      const local = mk()
+      const session = mk()
+      const { auth } = manager([json(200, { access_token: 'a', refresh_token: 'secret-refresh', expires_in: 900 })], { persistent: local, session, persistRefresh })
+      await auth.login()
+      expect([...local.data.values()].join('').includes('secret-refresh')).toBe(persistRefresh)
+      expect([...session.data.values()].join('').includes('secret-refresh')).toBe(!persistRefresh)
+    }
+  })
+
+  it('shares one refresh between concurrent callers (refresh tokens rotate)', async () => {
+    let refreshes = 0
+    const fetch = (async (url: string) => {
+      if (String(url).endsWith('/device/refresh')) {
+        refreshes++
+        return json(200, { access_token: 'new', refresh_token: 'r2', expires_in: 900 })
+      }
+      return json(200, grant)
+    }) as unknown as typeof globalThis.fetch
+    const auth = new AuthManager({ fetch, issuer: async () => 'https://i', persistent: null, session: null })
+    auth.useToken('old')
+    ;(auth as any).tokens = { accessToken: 'old', refreshToken: 'r1', expiresAt: 0 }
+    await Promise.all([auth.refresh(), auth.refresh(), auth.ensureFresh()])
+    expect(refreshes).toBe(1)
+    expect(auth.headers()).toEqual({ Authorization: 'Bearer new' })
+  })
+})
diff --git a/test/dialogs.test.tsx b/test/dialogs.test.tsx
new file mode 100644
index 0000000..8f91bde
--- /dev/null
+++ b/test/dialogs.test.tsx
@@ -0,0 +1,150 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+const select = async (id: string) => {
+  await act(async () => void click(byId(id)))
+  await h.settle()
+}
+const q = (sel: string) => h.shadow.querySelector<HTMLElement>(sel)!
+const qa = (sel: string) => [...h.shadow.querySelectorAll<HTMLElement>(sel)]
+const dialogs = () => qa('.cms-dialog')
+const z = (el: HTMLElement) => Number(el.style.zIndex)
+
+describe('one dialog per thing: opening again focuses the existing one', () => {
+  it('Properties opened twice for the same block is one dialog, raised, pulsing and focused', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Properties')
+    expect(dialogs()).toHaveLength(1)
+    const first = dialogs()[0]
+    const z0 = z(first)
+    await act(async () => void (document.activeElement as HTMLElement | null)?.blur?.())
+    await h.press('Properties') // again
+    expect(dialogs()).toHaveLength(1)
+    expect(dialogs()[0]).toBe(first) // the same element, not a replacement (form state is kept)
+    expect(z(first)).toBeGreaterThan(z0)
+    expect(first.className).toContain('is-pulsing')
+    expect(h.shadow.activeElement).toBe(first.querySelector('input'))
+  })
+
+  it('keeps unsaved edits when the dialog is asked for again', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Properties')
+    const input = q('[data-path="title"] input') as HTMLInputElement
+    const set = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')!.set!
+    await act(async () => {
+      set.call(input, 'Unsaved draft')
+      input.dispatchEvent(new Event('input', { bubbles: true }))
+    })
+    await h.press('Properties')
+    expect((q('[data-path="title"] input') as HTMLInputElement).value).toBe('Unsaved draft')
+  })
+
+  it('a double click before the first dialog has loaded still opens only one', async () => {
+    h = await setup()
+    await h.settle()
+    await Promise.all([h.editor.ctrl.openEditor('properties', 's1'), h.editor.ctrl.openEditor('properties', 's1')])
+    await h.settle()
+    expect(dialogs()).toHaveLength(1)
+  })
+
+  it('different blocks or editors get their own dialogs; reopening the older one raises it above the newer', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Properties')
+    await select('l1')
+    await h.press('Properties')
+    await h.press('Style')
+    expect(dialogs()).toHaveLength(3)
+    const [s1Props, l1Props, l1Style] = dialogs()
+    expect(z(l1Style)).toBeGreaterThan(z(l1Props))
+    await select('s1')
+    await h.press('Properties') // the oldest dialog comes forward
+    expect(dialogs()).toHaveLength(3)
+    expect(z(s1Props)).toBeGreaterThan(z(l1Style))
+  })
+
+  it('clicking a dialog brings it to the front; Escape closes the topmost', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Properties')
+    await select('t1')
+    await h.press('JSON').catch(() => {}) // under the … menu: open via the controller instead
+    await h.editor.ctrl.openEditor('raw-json', 't1')
+    await h.settle()
+    const [a, b] = dialogs()
+    expect(z(b)).toBeGreaterThan(z(a))
+    await act(async () => void a.dispatchEvent(new MouseEvent('pointerdown', { bubbles: true, composed: true })))
+    expect(z(a)).toBeGreaterThan(z(b))
+    await act(async () => void document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true })))
+    expect(dialogs()).toHaveLength(1)
+    expect(dialogs()[0]).toBe(b) // a was on top, so a closed
+  })
+
+  it('the same insert slot is one picker; another slot opens another', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await act(async () => void qa('.cms-slot')[1].click())
+    await h.settle()
+    await act(async () => void qa('.cms-slot')[1].click())
+    await h.settle()
+    expect(dialogs()).toHaveLength(1)
+    await act(async () => void qa('.cms-slot')[2].click())
+    await h.settle()
+    expect(dialogs()).toHaveLength(2)
+  })
+
+  it('an attribute chip opens one editor per property', async () => {
+    h = await setup()
+    await h.settle()
+    await select('f1')
+    const chip = () => qa('[aria-label="Edit href"]')[0]
+    await act(async () => void chip().click())
+    await h.settle()
+    await act(async () => void chip().click())
+    await h.settle()
+    expect(dialogs()).toHaveLength(1)
+    await act(async () => void qa('[aria-label="Edit href"]')[1].click())
+    await h.settle()
+    expect(dialogs()).toHaveLength(2)
+  })
+
+  it('after closing, the same dialog can be opened again', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Properties')
+    await h.press('Close')
+    expect(dialogs()).toHaveLength(0)
+    await h.press('Properties')
+    expect(dialogs()).toHaveLength(1)
+  })
+})
+
+describe('the property editor uses icons, not text glyphs', () => {
+  it('array, map and group controls are svg icons', async () => {
+    h = await setup()
+    await h.settle()
+    await select('f1')
+    await h.press('Properties')
+    const form = q('.cms-dialog').textContent!
+    expect(form).not.toMatch(/[↑↓⧉✕＋⠿▸↔↺]/)
+    for (const label of ['Move item 1 down', 'Duplicate item 1', 'Remove item 1', 'Add item']) {
+      expect(q(`[aria-label="${label}"] svg path`), label).not.toBeNull()
+    }
+    expect(q('[aria-label="Add entry"] svg')).not.toBeNull()
+    expect(q('.cms-group > summary svg.cms-chev')).not.toBeNull()
+    expect(q('.cms-actions .cms-btn--primary svg')).not.toBeNull()
+  })
+})
diff --git a/test/dnd.test.ts b/test/dnd.test.ts
new file mode 100644
index 0000000..44d60c1
--- /dev/null
+++ b/test/dnd.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from 'vitest'
+import { dropTarget } from '../src/page/dnd'
+import type { DndBlock } from '../src/page/dnd'
+
+const r = (y: number, h = 100, x = 0, w = 600) => ({ x, y, w, h })
+// page: A (container: a1, a2) , B (container, empty), C (leaf)
+const blocks: DndBlock[] = [
+  { id: 'A', container: true, depth: 0, rect: r(0, 300) },
+  { id: 'a1', parentId: 'A', container: false, depth: 1, rect: r(10, 100, 10, 580) },
+  { id: 'a2', parentId: 'A', container: false, depth: 1, rect: r(120, 100, 10, 580) },
+  { id: 'B', container: true, depth: 0, rect: r(310, 100) },
+  { id: 'C', container: false, depth: 0, rect: r(420, 100) },
+]
+
+describe('dropTarget', () => {
+  it('picks the index from the pointer relative to sibling midpoints', () => {
+    expect(dropTarget(blocks, { x: 50, y: 20 }, 'C')).toMatchObject({ parentId: 'A', index: 0 })
+    expect(dropTarget(blocks, { x: 50, y: 100 }, 'C')).toMatchObject({ parentId: 'A', index: 1 })
+    expect(dropTarget(blocks, { x: 50, y: 250 }, 'C')).toMatchObject({ parentId: 'A', index: 2 })
+  })
+  it('excludes the dragged block from the index maths', () => {
+    // dragging a1 within A: pointer below a2's midpoint -> after a2 = index 1 among [a2]
+    expect(dropTarget(blocks, { x: 50, y: 200 }, 'a1')).toMatchObject({ parentId: 'A', index: 1 })
+  })
+  it('drops into an empty container', () => {
+    const t = dropTarget(blocks, { x: 50, y: 350 }, 'C')!
+    expect(t).toMatchObject({ parentId: 'B', index: 0 })
+    expect(t.line.y).toBeGreaterThanOrEqual(310)
+  })
+  it('never targets the dragged block or its descendants', () => {
+    expect(dropTarget(blocks, { x: 50, y: 20 }, 'A')?.parentId).toBe('') // A is not a drop target for itself -> page level
+  })
+  it('page level uses the root sentinel and refuses far-away points', () => {
+    expect(dropTarget(blocks, { x: 50, y: 460 }, 'a1')).toMatchObject({ parentId: '', index: 2 })
+    expect(dropTarget(blocks, { x: 50, y: 500 }, 'a1')).toMatchObject({ parentId: '', index: 3 })
+    expect(dropTarget(blocks, { x: 50, y: 900 }, 'a1')).toBeNull()
+  })
+})
diff --git a/test/editor.test.tsx b/test/editor.test.tsx
new file mode 100644
index 0000000..ce7e2d7
--- /dev/null
+++ b/test/editor.test.tsx
@@ -0,0 +1,226 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+const selectBlock = async (id: string) => {
+  await act(async () => void click(byId(id)))
+  await h.settle()
+}
+const order = (parent: string) => [...byId(parent).querySelectorAll(':scope > [data-cms]')].map((e) => e.getAttribute('data-cms'))
+
+describe('on-page editor against the mock CMS', () => {
+  it('scans blocks and selects on click without navigating', async () => {
+    h = await setup()
+    expect(h.editor.ctrl.store.get().blocks.map((b) => b.id)).toEqual(['s1', 'h1', 't1', 'b1', 's2', 't2', 'l1', 'x1', 'x2', 'f1'])
+    const ev = new MouseEvent('click', { bubbles: true, cancelable: true })
+    await act(async () => void byId('b1').querySelector('a')!.dispatchEvent(ev))
+    expect(ev.defaultPrevented).toBe(true)
+    expect(h.editor.ctrl.store.get().selected).toBe('b1')
+  })
+
+  it('browse mode leaves the page alone', async () => {
+    h = await setup()
+    await h.press('Toggle editing (links work in browse mode)')
+    const ev = new MouseEvent('click', { bubbles: true, cancelable: true })
+    await act(async () => void byId('b1').querySelector('a')!.dispatchEvent(ev))
+    expect(ev.defaultPrevented).toBe(false)
+    expect(h.editor.ctrl.store.get().selected).toBeNull()
+  })
+
+  it('resolves the edge through the API (no data-cms-edge in the markup) and moves a block', async () => {
+    h = await setup()
+    await selectBlock('t1')
+    await h.editor.ctrl.nudge('t1', 1)
+    await h.settle()
+    expect(order('s1')).toEqual(['h1', 'b1', 't1']) // morphed from the server patch
+    expect(h.cms.graph.children('s1').map((e) => e.to)).toEqual(['h1', 'b1', 't1'])
+  })
+
+  it('undo/redo replay the server inverse and re-morph the page', async () => {
+    h = await setup()
+    await selectBlock('t1')
+    await h.editor.ctrl.nudge('t1', 1)
+    await h.settle()
+    await h.press('Undo (Ctrl+Z)')
+    expect(order('s1')).toEqual(['h1', 't1', 'b1'])
+    await h.press('Redo (Ctrl+Shift+Z)')
+    expect(order('s1')).toEqual(['h1', 'b1', 't1'])
+  })
+
+  it('delete + undo restores the subtree and DOM', async () => {
+    h = await setup()
+    await h.editor.ctrl.remove('s1')
+    await h.settle()
+    expect(document.querySelector('[data-cms="s1"]')).toBeNull()
+    await h.press('Undo (Ctrl+Z)')
+    expect(byId('h1').textContent).toBe('Edit this headline')
+  })
+
+  it('insert goes through the picker, uses x-graph children, and selects the new block', async () => {
+    h = await setup()
+    await selectBlock('s1')
+    await h.press('Add inside')
+    const tiles = [...h.shadow.querySelectorAll<HTMLElement>('.cms-tile')].map((t) => t.dataset.type)
+    expect(tiles).toEqual(expect.arrayContaining(['heading', 'text', 'button', 'section']))
+    expect(tiles).not.toContain('page')
+    await act(async () => void h.shadow.querySelector<HTMLElement>('.cms-tile[data-type="button"]')!.click())
+    await h.settle()
+    expect(h.cms.graph.children('s1')).toHaveLength(4)
+    expect(h.editor.ctrl.store.get().selected).toBe(h.cms.graph.children('s1')[3].to)
+  })
+
+  it('page-level insert resolves the root from the top block, and a root patch error falls back to a soft reload', async () => {
+    h = await setup()
+    await selectBlock('s1')
+    const root = await h.editor.ctrl.parentIdOf('s1')
+    expect(root).toBe('p1')
+    await h.editor.ctrl.insert(root, 'heading', { data: { text: 'Top-level' }, index: 0 })
+    await h.settle()
+    // The server could not render the page node standalone: the editor re-fetched and morphed.
+    expect(document.querySelector('[data-cms-type="heading"]')!.textContent).toBe('Top-level')
+  })
+
+  it('properties dialog edits through the schema form and saves only the diff', async () => {
+    h = await setup()
+    await selectBlock('s1')
+    await h.press('Properties')
+    const input = h.shadow.querySelector<HTMLInputElement>('[data-path="title"] input')!
+    expect(input.value).toBe('Welcome')
+    const set = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')!.set!
+    await act(async () => {
+      set.call(input, 'Hello')
+      input.dispatchEvent(new Event('input', { bubbles: true }))
+    })
+    await act(async () => void h.shadow.querySelector<HTMLElement>('.cms-btn--primary')!.click())
+    await h.settle()
+    expect(h.cms.graph.node('s1').data).toMatchObject({ title: 'Hello', tone: 'dark', padded: true })
+    expect(byId('s1').querySelector('.sec__title')!.textContent).toBe('Hello')
+    const edit = h.editor.ctrl.store.get().log.find((l) => l.url === '/api/edit')!
+    expect((edit.request as any).ops[0]).toMatchObject({ op: 'set', id: 's1', data: { title: 'Hello' }, version: 1 })
+  })
+
+  it('array editors save through the dialog as a minimal diff, and invalid data blocks Save', async () => {
+    h = await setup()
+    await selectBlock('f1')
+    await h.press('Properties')
+    const links = h.shadow.querySelector('[data-path="links"]')!
+    await act(async () => void links.querySelector<HTMLElement>('[aria-label="Add item"]')!.click())
+    const save = () => h.shadow.querySelector<HTMLButtonElement>('.cms-btn--primary')!
+    expect(save().disabled).toBe(true) // new link has an empty required "text", and nothing else changed yet
+    expect(h.shadow.querySelector('.cms-actions__note')!.textContent).toContain('1 problem')
+    const set = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')!.set!
+    const text = h.shadow.querySelector<HTMLInputElement>('[data-path="links.2.text"] input')!
+    await act(async () => {
+      set.call(text, 'Contact')
+      text.dispatchEvent(new Event('input', { bubbles: true }))
+    })
+    expect(save().disabled).toBe(false)
+    await act(async () => void save().click())
+    await h.settle()
+    expect(h.cms.graph.node('f1').data.links.map((l: any) => l.text)).toEqual(['About', 'Careers', 'Contact'])
+    const op = h.editor.ctrl.store.get().log.find((l) => l.url === '/api/edit')!.request as any
+    expect(Object.keys(op.ops[0].data)).toEqual(['links']) // companyName, usps, social... untouched
+  })
+
+  it('a stale version shows a conflict instead of overwriting', async () => {
+    h = await setup()
+    await selectBlock('s1')
+    await h.press('Properties')
+    h.cms.graph.edit([{ op: 'set', id: 's1', data: { title: 'Someone else' } }]) // concurrent editor
+    const input = h.shadow.querySelector<HTMLInputElement>('[data-path="title"] input')!
+    const set = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')!.set!
+    await act(async () => {
+      set.call(input, 'Mine')
+      input.dispatchEvent(new Event('input', { bubbles: true }))
+    })
+    await act(async () => void h.shadow.querySelector<HTMLElement>('.cms-btn--primary')!.click())
+    await h.settle()
+    expect(h.cms.graph.node('s1').data.title).toBe('Someone else')
+    expect(h.editor.ctrl.store.get().toast?.text).toMatch(/Someone else changed/)
+  })
+
+  it('inline text editing sends debounced, coalesced sets (one undo step)', async () => {
+    h = await setup()
+    const field = byId('h1')
+    await act(async () => void field.dispatchEvent(new MouseEvent('dblclick', { bubbles: true, cancelable: true, composed: true })))
+    await h.settle()
+    expect(field.getAttribute('contenteditable')).toBeTruthy()
+    for (const t of ['Hel', 'Hello', 'Hello world']) {
+      field.textContent = t
+      field.dispatchEvent(new Event('input', { bubbles: true }))
+    }
+    h.editor.ctrl.stopInline() // flushes
+    await h.settle()
+    expect(h.cms.graph.node('h1').data.text).toBe('Hello world')
+    expect(field.hasAttribute('contenteditable')).toBe(false)
+    await h.press('Undo (Ctrl+Z)')
+    expect(h.cms.graph.node('h1').data.text).toBe('Edit this headline')
+    expect(byId('h1').textContent).toBe('Edit this headline')
+  })
+
+  it('delete offers an Undo toast that restores the block', async () => {
+    h = await setup()
+    await h.editor.ctrl.remove('t1')
+    await h.settle()
+    const toast = h.editor.ctrl.store.get().toast!
+    expect(toast.text).toBe('Block deleted')
+    toast.action!.run()
+    await h.settle()
+    expect(byId('t1')).not.toBeNull()
+  })
+
+  it('dropBlock re-parents with one move op and the page follows', async () => {
+    h = await setup()
+    await h.editor.ctrl.dropBlock('t1', { parentId: 's2', index: 0, line: { x: 0, y: 0, w: 0, h: 0 } })
+    await h.settle()
+    expect(order('s2')).toEqual(['t1', 't2'])
+    expect(order('s1')).toEqual(['h1', 'b1'])
+    // dropping where it already is does nothing
+    const before = h.editor.ctrl.store.get().log.length
+    await h.editor.ctrl.dropBlock('t1', { parentId: 's2', index: 0, line: { x: 0, y: 0, w: 0, h: 0 } })
+    expect(h.editor.ctrl.store.get().log.filter((l) => l.url === '/api/edit')).toHaveLength(1)
+    expect(h.editor.ctrl.store.get().log.length).toBeGreaterThanOrEqual(before)
+  })
+
+  it('the base page is swapped for the latest preview on load, via /api/preview', async () => {
+    h = await setup({ stale: true })
+    await h.settle()
+    expect(byId('h1').textContent).toBe('Latest from the store')
+    expect(h.cms.requests.some((r) => r.startsWith('GET /api/preview?path=%2F'))).toBe(true)
+  })
+
+  it('falls back to the page URL with the preview header when /api/preview is missing', async () => {
+    h = await setup({ stale: true, noPreviewApi: true })
+    await h.settle()
+    expect(byId('h1').textContent).toBe('Latest from the store')
+    expect(h.cms.requests.filter((r) => r.startsWith('GET /api/preview')).length).toBeGreaterThan(0)
+  })
+
+  it('does not touch the page while signed out (visitors keep the published file)', async () => {
+    h = await setup({ stale: true, auth: true })
+    await h.settle()
+    expect(byId('h1').textContent).toBe('Edit this headline')
+    expect(h.cms.requests.some((r) => r.includes('/api/preview'))).toBe(false)
+  })
+
+  it('refreshes when the tab becomes visible again (other editors\' changes)', async () => {
+    h = await setup()
+    await h.settle()
+    h.cms.graph.edit([{ op: 'set', id: 'h1', data: { text: 'Edited elsewhere' } }])
+    ;(h.editor.ctrl as any).lastPreview = 0 // skip the 5s throttle
+    document.dispatchEvent(new Event('visibilitychange'))
+    await h.settle()
+    expect(byId('h1').textContent).toBe('Edited elsewhere')
+  })
+
+  it('exposes window.__cmsEditor and is idempotent', async () => {
+    h = await setup()
+    expect((window as any).__cmsEditor).toBe(h.editor)
+    const { boot } = await import('../src/boot')
+    expect(boot()).toBe(h.editor)
+  })
+})
diff --git a/test/form.test.tsx b/test/form.test.tsx
new file mode 100644
index 0000000..613f52d
--- /dev/null
+++ b/test/form.test.tsx
@@ -0,0 +1,213 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { cleanup, fireEvent, render, within } from '@testing-library/react'
+import { useState } from 'react'
+import { SchemaForm } from '../src/form/Form'
+import { validate } from '../src/form/validate'
+import { defaultFor, pickVariant, resolveSchema } from '../src/form/resolve'
+import { schemas } from '../mock/fixtures'
+
+afterEach(cleanup)
+
+/** Controlled harness; `onValue` sees every change so tests can assert the exact data written. */
+function Harness({ schema, initial, onValue }: { schema: any; initial: any; onValue(v: any): void }) {
+  const [v, setV] = useState(initial)
+  return <SchemaForm schema={schema} value={v} onChange={(n) => (setV(n), onValue(n))} node={{ id: 'n', dataType: 't', data: initial }} ctrl={null as never} />
+}
+function mount(schema: any, initial: any = {}) {
+  let last = initial
+  const r = render(<Harness schema={schema} initial={initial} onValue={(v) => (last = v)} />)
+  return { ...r, value: () => last, field: (path: string) => r.container.querySelector<HTMLElement>(`[data-path="${path}"]`)! }
+}
+const type = (el: Element, v: string) => fireEvent.change(el, { target: { value: v } })
+
+const footer = schemas.footer
+const data = () => structuredClone({ companyName: 'Mock AB', links: [{ text: 'About', href: 'https://x.test/a' }, { text: 'Careers', href: 'https://x.test/b' }], usps: ['Fast', 'Friendly'], social: { github: 'https://g.test' }, badges: ['gdpr'], cta: { kind: 'link', href: '/c' } })
+
+describe('array of objects ($ref items)', () => {
+  it('shows summaries, edits nested fields, and writes them back', () => {
+    const m = mount(footer, data())
+    const links = m.field('links')
+    expect(links.textContent).toContain('About')
+    expect(links.textContent).toContain('Careers')
+    type(within(links).getAllByRole('textbox')[0], 'About us') // items <= 2 start expanded
+    expect(m.value().links[0]).toMatchObject({ text: 'About us', href: 'https://x.test/a' })
+  })
+
+  it('adds an item with schema defaults, respecting maxItems', () => {
+    const m = mount(footer, data())
+    for (let i = 0; i < 6; i++) fireEvent.click(within(m.field('links')).getByLabelText('Add item'))
+    expect(m.value().links).toHaveLength(6)
+    expect(m.value().links[5]).toEqual({ text: '' }) // required props seeded
+    expect((within(m.field('links')).getByLabelText('Add item') as HTMLButtonElement).disabled).toBe(true)
+  })
+
+  it('reorders (buttons), duplicates and removes', () => {
+    const m = mount(footer, data())
+    const l = () => within(m.field('links'))
+    fireEvent.click(l().getByLabelText('Move item 1 down'))
+    expect(m.value().links.map((x: any) => x.text)).toEqual(['Careers', 'About'])
+    fireEvent.click(l().getByLabelText('Duplicate item 1'))
+    expect(m.value().links.map((x: any) => x.text)).toEqual(['Careers', 'Careers', 'About'])
+    fireEvent.click(l().getByLabelText('Remove item 2'))
+    expect(m.value().links.map((x: any) => x.text)).toEqual(['Careers', 'About'])
+  })
+
+  it('keeps open/closed state with the item when reordering', () => {
+    const d = data()
+    d.links.push({ text: 'Third', href: 'https://x.test/c' }) // 3 items -> all start collapsed
+    const m = mount(footer, d)
+    const l = () => within(m.field('links'))
+    fireEvent.click(l().getByText('Third')) // expand it
+    expect(l().queryAllByRole('textbox')).toHaveLength(2) // text + href of the one open card
+    fireEvent.click(l().getByLabelText('Move item 3 up'))
+    expect(m.value().links.map((x: any) => x.text)).toEqual(['About', 'Third', 'Careers'])
+    expect(l().getAllByRole('textbox')[0].getAttribute('value')).toBe('Third') // still the open one
+  })
+
+  it('an optional array emptied is removed from the data', () => {
+    const m = mount(footer, { companyName: 'x', links: [{ text: 'Only' }] })
+    fireEvent.click(within(m.field('links')).getByLabelText('Remove item 1'))
+    expect('links' in m.value()).toBe(false)
+  })
+})
+
+describe('primitive arrays', () => {
+  it('edit in place, add and remove rows', () => {
+    const m = mount(footer, data())
+    const u = () => within(m.field('usps'))
+    type(u().getAllByRole('textbox')[1], 'Very friendly')
+    expect(m.value().usps).toEqual(['Fast', 'Very friendly'])
+    fireEvent.click(u().getByLabelText('Add item'))
+    expect(m.value().usps).toEqual(['Fast', 'Very friendly', ''])
+    fireEvent.click(u().getByLabelText('Remove item 1'))
+    expect(m.value().usps).toEqual(['Very friendly', ''])
+  })
+
+  it('uniqueItems + enum renders a checkbox set', () => {
+    const m = mount(footer, data())
+    const boxes = within(m.field('badges')).getAllByRole('checkbox') as HTMLInputElement[]
+    expect(boxes.map((b) => b.checked)).toEqual([false, true, false])
+    fireEvent.click(boxes[0])
+    expect(m.value().badges).toEqual(['gdpr', 'iso9001'])
+    fireEvent.click(boxes[1])
+    expect(m.value().badges).toEqual(['iso9001'])
+  })
+})
+
+describe('object maps (additionalProperties)', () => {
+  it('adds, renames (keeping order), edits and removes keys; blocks duplicates', () => {
+    const m = mount(footer, data())
+    const s = () => within(m.field('social'))
+    type(s().getByLabelText('New key'), 'mastodon')
+    fireEvent.click(s().getByLabelText('Add entry'))
+    expect(Object.keys(m.value().social)).toEqual(['github', 'mastodon'])
+    const key = s().getByLabelText('Key github')
+    type(key, 'gh')
+    fireEvent.blur(key)
+    expect(Object.keys(m.value().social)).toEqual(['gh', 'mastodon'])
+    type(s().getByLabelText('New key'), 'gh')
+    fireEvent.click(s().getByLabelText('Add entry'))
+    expect(s().getByText('That key already exists')).toBeTruthy()
+    fireEvent.click(s().getByLabelText('Remove gh'))
+    expect(Object.keys(m.value().social)).toEqual(['mastodon'])
+  })
+
+  it('x-dict-keys is a fixed vocabulary: one row per key, blank removes', () => {
+    const schema = { type: 'object', properties: { m: { type: 'object', 'x-editor': 'dictionary', 'x-dict-keys': ['höjd', 'bredd'], additionalProperties: { type: 'integer' } } } }
+    const m = mount(schema, { m: { höjd: 5 } })
+    const inputs = within(m.field('m')).getAllByRole('spinbutton')
+    expect(inputs).toHaveLength(2)
+    type(inputs[1], '7')
+    expect(m.value().m).toEqual({ höjd: 5, bredd: 7 })
+    type(inputs[0], '')
+    expect(m.value().m).toEqual({ bredd: 7 })
+  })
+})
+
+describe('variants and refs', () => {
+  it('oneOf: picks the branch from the data and switching sets the discriminator', () => {
+    const m = mount(footer, data())
+    const sel = within(m.field('cta')).getByLabelText('Variant') as HTMLSelectElement
+    expect(sel.options[sel.selectedIndex].text).toBe('Link')
+    fireEvent.change(sel, { target: { value: '1' } })
+    expect(m.value().cta).toEqual({ kind: 'phone', number: '' })
+    type(within(m.field('cta')).getAllByRole('textbox')[0], '08-1234')
+    expect(m.value().cta).toEqual({ kind: 'phone', number: '08-1234' })
+  })
+
+  it('nullable unions unwrap to the real type', () => {
+    const root = { $defs: { s: { type: 'string' } } }
+    expect(resolveSchema(root, { anyOf: [{ $ref: '#/$defs/s' }, { type: 'null' }] })).toMatchObject({ nullable: true, schema: { type: 'string' } })
+    expect(resolveSchema(root, { type: ['integer', 'null'] })).toMatchObject({ nullable: true, schema: { type: 'integer' } })
+  })
+
+  it('resolves $ref chains and merges allOf', () => {
+    const root = { $defs: { a: { properties: { x: { type: 'string' } }, required: ['x'] }, b: { allOf: [{ $ref: '#/$defs/a' }, { properties: { y: { type: 'number' } } }] } } }
+    const { schema } = resolveSchema(root, { $ref: '#/$defs/b', title: 'B' })
+    expect(Object.keys(schema.properties)).toEqual(['x', 'y'])
+    expect(schema.required).toEqual(['x'])
+    expect(schema.title).toBe('B')
+  })
+
+  it('pickVariant scores by discriminator, type and required keys', () => {
+    const b = footer.properties.cta.oneOf
+    expect(pickVariant(footer, b, { kind: 'phone', number: '1' })).toBe(1)
+    expect(pickVariant(footer, b, undefined)).toBe(-1)
+    expect(pickVariant({}, [{ type: 'string' }, { type: 'number' }], 3)).toBe(1)
+  })
+
+  it('defaultFor seeds required props, consts and enums', () => {
+    expect(defaultFor(footer, footer.properties.links.items)).toEqual({ text: '' })
+    expect(defaultFor(footer, footer.properties.cta.oneOf[1])).toEqual({ kind: 'phone', number: '' })
+    expect(defaultFor({}, { type: 'string', enum: ['a', 'b'] })).toBe('a')
+  })
+})
+
+describe('field behaviour', () => {
+  it('hidden fields are not rendered; readOnly are shown but not editable', () => {
+    const m = mount(footer, { companyName: 'x', internal: 'abc', secret: 's' })
+    expect(m.field('secret')).toBeNull()
+    expect(m.field('internal').querySelector('input,textarea')).toBeNull()
+    expect(m.field('internal').textContent).toContain('abc')
+  })
+
+  it('x-group becomes a collapsible section', () => {
+    const m = mount(footer, data())
+    const groups = [...m.container.querySelectorAll('details.cms-group')] as HTMLDetailsElement[]
+    expect(groups.map((g) => g.querySelector('summary')!.textContent!.replace(/\s*\(\d+\)/, ''))).toEqual(['Contact', 'Social'])
+    expect(groups.map((g) => g.open)).toEqual([true, false]) // collapsedByDefault
+  })
+
+  it('clearing an optional string removes the key; a required one keeps ""', () => {
+    const m = mount(footer, { companyName: 'Acme', tagline: 'hi' })
+    type(m.field('tagline').querySelector('input')!, '')
+    expect('tagline' in m.value()).toBe(false)
+    type(m.field('companyName').querySelector('input')!, '')
+    expect(m.value().companyName).toBe('')
+  })
+
+  it('data not in the schema stays editable under "not in the schema"', () => {
+    const m = mount({ type: 'object', properties: { a: { type: 'string' } } }, { a: '1', legacy: 'old' })
+    expect(m.container.querySelector('.cms-extra')!.textContent).toContain('1 field')
+    type(m.container.querySelector('.cms-extra input')!, 'new')
+    expect(m.value()).toEqual({ a: '1', legacy: 'new' })
+  })
+})
+
+describe('validation', () => {
+  it('reports required/minLength/format inside array items with form paths', () => {
+    const e = validate(footer, footer, { companyName: '', links: [{ text: 'x' }, { text: 'ok' }], email: 'nope' })
+    expect(e).toMatchObject({ companyName: 'Required', 'links.0.text': 'At least 2 characters', email: 'Not a valid email address' })
+    expect(e['links.1.text']).toBeUndefined()
+  })
+  it('checks minItems/maxItems/number bounds and validates the chosen variant only', () => {
+    const s = { type: 'object', properties: { l: { type: 'array', minItems: 2, items: { type: 'integer', maximum: 5 } }, v: footer.properties.cta } }
+    expect(validate(s, s, { l: [9], v: { kind: 'phone' } })).toMatchObject({ l: 'Add at least 2 items', 'l.0': 'Must be at most 5', 'v.number': 'Required' })
+  })
+  it('shows messages inline and flags the field', () => {
+    const m = mount(footer, { companyName: 'ok', links: [{ text: 'x' }] })
+    const row = m.container.querySelector('[data-path="links.0.text"]')!
+    expect(row.className).toContain('has-error')
+    expect(row.querySelector('[role=alert]')!.textContent).toBe('At least 2 characters')
+  })
+})
diff --git a/test/harness.ts b/test/harness.ts
new file mode 100644
index 0000000..7417a90
--- /dev/null
+++ b/test/harness.ts
@@ -0,0 +1,58 @@
+// Test harness: boots the real editor against the mock CMS inside jsdom.
+import { act } from 'react'
+import { Api } from '../src/api'
+import { AuthManager } from '../src/auth'
+import { boot } from '../src/boot'
+import type { EditorHandle } from '../src/boot'
+import { createMockCms } from '../mock/server'
+import { renderPage } from '../mock/fixtures'
+
+export interface Harness {
+  cms: ReturnType<typeof createMockCms>
+  auth: AuthManager
+  editor: EditorHandle
+  /** Wait for async work (fetches, patch application, React). */
+  settle(): Promise<void>
+  shadow: ShadowRoot
+  /** Click something inside the editor UI by accessible label. */
+  press(label: string): Promise<void>
+  cleanup(): void
+}
+
+/** `stale`: the DOM is the *published* page, and the store has moved on since (the base-page problem). */
+export async function setup(opts: { token?: string; auth?: boolean; stale?: boolean; noPreviewApi?: boolean } = {}): Promise<Harness> {
+  const cms = createMockCms({ token: opts.token, auth: opts.auth })
+  document.head.innerHTML = ''
+  window.open = () => null
+  document.body.innerHTML = renderPage(cms.graph).match(/<body>([\s\S]*)<\/body>/)![1]
+  if (opts.stale) cms.graph.edit([{ op: 'set', id: 'h1', data: { text: 'Latest from the store' } }])
+  if (opts.noPreviewApi) cms.disablePreviewApi()
+  const auth = new AuthManager({ fetch: cms.fetch, persistent: null, session: null, sleep: (ms) => new Promise((r) => setTimeout(r, Math.min(ms, 5))) })
+  const api = new Api({ fetch: cms.fetch, auth })
+  let editor!: EditorHandle
+  await act(async () => {
+    editor = boot({ api })
+  })
+  const settle = () => act(async () => void (await new Promise((r) => setTimeout(r, 25))))
+  const shadow = document.getElementById('cms-onpage-editor')!.shadowRoot!
+  return {
+    cms,
+    auth,
+    editor,
+    settle,
+    shadow,
+    async press(label) {
+      const el = shadow.querySelector<HTMLElement>(`[aria-label="${label}"], [title="${label}"]`)
+      if (!el) throw new Error(`no control "${label}" in editor UI`)
+      await act(async () => el.click())
+      await settle()
+    },
+    cleanup() {
+      editor.destroy()
+      document.body.innerHTML = ''
+    },
+  }
+}
+
+export const click = (el: Element) => el.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, composed: true }))
+export const byId = (id: string) => document.querySelector<HTMLElement>(`[data-cms="${id}"]`)!
diff --git a/test/infer.test.ts b/test/infer.test.ts
new file mode 100644
index 0000000..e7c888c
--- /dev/null
+++ b/test/infer.test.ts
@@ -0,0 +1,174 @@
+import { describe, expect, it } from 'vitest'
+import { collectStrings, getIn, inferBindings, markInferred, parsePath, patchForPath } from '../src/page/infer'
+import { acceptsChild, allowedChildren, typeName } from '../src/schema'
+import { schemas } from '../mock/fixtures'
+import { dropTarget } from '../src/page/dnd'
+
+const dom = (html: string) => {
+  document.body.innerHTML = `<section data-cms="b">${html}</section>`
+  const block = document.querySelector<HTMLElement>('[data-cms="b"]')!
+  return { block, owns: (el: Element) => el.closest('[data-cms]') === block }
+}
+
+describe('collectStrings', () => {
+  it('walks nested arrays and objects with paths, skipping lifecycle, enums, markdown and read-only', () => {
+    const schema = { type: 'object', properties: { title: { type: 'string' }, kind: { type: 'string', enum: ['a', 'b'] }, body: { type: 'string', 'x-editor': 'markdown' }, ro: { type: 'string', readOnly: true }, items: { type: 'array', items: { type: 'object', properties: { text: { type: 'string' } } } } } }
+    const data = { title: 'Hi', kind: 'a', body: '# x', ro: 'r', status: 'published', items: [{ text: 'One' }, { text: 'Two' }], blank: '  ' }
+    expect(collectStrings(data, schema).map((s) => [s.path.join('.'), s.value])).toEqual([['title', 'Hi'], ['items.0.text', 'One'], ['items.1.text', 'Two']])
+  })
+  it('works without a schema (everything is a candidate)', () => {
+    expect(collectStrings({ a: { b: ['x'] } }).map((s) => s.path.join('.'))).toEqual(['a.b.0'])
+  })
+})
+
+describe('inferBindings', () => {
+  it('binds a unique leaf text to its property, nested paths included', () => {
+    const { block, owns } = dom('<h2>Hello</h2><ul><li><a href="/a">About</a></li><li><a href="/b">Careers</a></li></ul>')
+    const r = inferBindings(block, owns, collectStrings({ title: 'Hello', links: [{ text: 'About', href: '/a' }, { text: 'Careers', href: '/b' }] }))
+    expect(r.text.map((t) => t.path)).toEqual(['title', 'links.0.text', 'links.1.text'])
+    expect(r.attrs.map((a) => [a.path, a.attr])).toEqual([['links.0.href', 'href'], ['links.1.href', 'href']])
+  })
+
+  it('skips ambiguity instead of guessing: same text twice, or one value on two properties', () => {
+    const twice = dom('<p>Same</p><p>Same</p>')
+    expect(inferBindings(twice.block, twice.owns, collectStrings({ a: 'Same' })).text).toEqual([])
+    const shared = dom('<p>Both</p>')
+    expect(inferBindings(shared.block, shared.owns, collectStrings({ a: 'Both', b: 'Both' })).text).toEqual([])
+  })
+
+  it('only binds text leaves; whitespace differences do not matter; nested blocks bind their own data', () => {
+    const { block, owns } = dom('<div><span>Mixed</span> text</div><p>  Spaced \n out </p><section data-cms="child"><p>Child text</p></section>')
+    const r = inferBindings(block, owns, collectStrings({ x: 'Mixed text', y: 'Spaced out', z: 'Child text' }))
+    expect(r.text.map((t) => t.path)).toEqual(['y']) // x is not a leaf; z belongs to the nested block
+  })
+
+  it('leaves elements with an explicit data-cms-field alone', () => {
+    const { block, owns } = dom('<h1 data-cms-field="heading" data-cms-editor="text">Title</h1>')
+    expect(inferBindings(block, owns, collectStrings({ heading: 'Title' })).text).toEqual([])
+  })
+
+  it('is idempotent: re-inferring a block that already carries inferred markers keeps the bindings', () => {
+    const { block, owns } = dom('<h2>Hello</h2>')
+    const strings = collectStrings({ a: 'Hello' })
+    markInferred(block, inferBindings(block, owns, strings).text)
+    const again = inferBindings(block, owns, strings)
+    expect(again.text.map((t) => t.path)).toEqual(['a'])
+  })
+
+  it('markInferred tags leaves for the normal inline editor, and re-marking cleans up first', () => {
+    const { block, owns } = dom('<h2>Hello</h2><p>World</p>')
+    markInferred(block, inferBindings(block, owns, collectStrings({ a: 'Hello', b: 'World' })).text)
+    expect(block.querySelector('h2')!.getAttribute('data-cms-field')).toBe('a')
+    expect(block.querySelector('h2')!.getAttribute('data-cms-editor')).toBe('text')
+    markInferred(block, inferBindings(block, owns, collectStrings({ b: 'World' })).text)
+    expect(block.querySelector('h2')!.hasAttribute('data-cms-field')).toBe(false)
+    expect(block.querySelector('p')!.getAttribute('data-cms-field')).toBe('b')
+  })
+})
+
+describe('paths', () => {
+  it('parse / get / patchForPath (top-level key rebuilt, input untouched)', () => {
+    expect(parsePath('links.0.text')).toEqual(['links', 0, 'text'])
+    const data = { title: 't', links: [{ text: 'A', href: '/a' }, { text: 'B' }] }
+    expect(getIn(data, parsePath('links.1.text'))).toBe('B')
+    expect(patchForPath(data, ['title'], 'x')).toEqual({ title: 'x' })
+    expect(patchForPath(data, parsePath('links.0.text'), 'Z')).toEqual({ links: [{ text: 'Z', href: '/a' }, { text: 'B' }] })
+    expect(data.links[0].text).toBe('A')
+    expect(patchForPath({}, parsePath('a.b.c'), 'v')).toEqual({ a: { b: { c: 'v' } } })
+    expect(patchForPath({}, parsePath('a.0'), 'v')).toEqual({ a: ['v'] })
+  })
+})
+
+describe('what a container accepts', () => {
+  it('x-graph.children: true means anything (the shape the real schemas use); lists and * work too', () => {
+    expect(allowedChildren({ 'x-graph': { children: true } }, ['a', 'b'])).toEqual(['a', 'b'])
+    expect(allowedChildren({ 'x-graph': { children: ['a'] } }, ['a', 'b'])).toEqual(['a'])
+    expect(allowedChildren({ 'x-graph': { children: ['*'] } }, ['a', 'b'])).toEqual(['a', 'b'])
+    expect(allowedChildren({ 'x-graph': {} }, ['a'])).toEqual([])
+    expect(allowedChildren(undefined, ['a'])).toEqual([])
+  })
+  it('acceptsChild is optimistic for unknown schemas, strict for known ones', () => {
+    expect(acceptsChild(undefined, 'x', [])).toBe(true)
+    expect(acceptsChild(schemas.section, 'heading', [])).toBe(true)
+    expect(acceptsChild(schemas.section, 'page', [])).toBe(false)
+    expect(acceptsChild(schemas.heading, 'text', [])).toBe(false) // a leaf type
+  })
+  it('typeName tolerates the shapes /api/types might use', () => {
+    expect([typeName('a'), typeName({ type: 'b' }), typeName({ name: 'c' }), typeName({ dataType: 'd' }), typeName(null)]).toEqual(['a', 'b', 'c', 'd', ''])
+  })
+  it('dropTarget refuses containers that do not accept, falling back to an ancestor that does', () => {
+    const r = (y: number, h = 100) => ({ x: 0, y, w: 600, h })
+    const blocks = [
+      { id: 'outer', container: true, depth: 0, rect: r(0, 400) },
+      { id: 'inner', parentId: 'outer', container: true, depth: 1, rect: r(50, 200) },
+    ]
+    expect(dropTarget(blocks, { x: 10, y: 100 }, null)!.parentId).toBe('inner')
+    expect(dropTarget(blocks, { x: 10, y: 100 }, null, (p) => p !== 'inner')!.parentId).toBe('outer')
+    expect(dropTarget(blocks, { x: 10, y: 100 }, null, () => false)!.parentId).toBe('') // page level
+    expect(dropTarget(blocks, { x: 900, y: 100 }, null, () => false)).toBeNull() // beside the page: over an editor panel
+  })
+})
+
+import { moveTarget, rootExtent, sortTarget } from '../src/page/dnd'
+
+describe('sort snapping between siblings', () => {
+  const r = (y: number, h: number, x = 0, w = 600) => ({ x, y, w, h })
+  // four root blocks (A, B, C are containers - the case that used to nest instead of sort), with children
+  const blocks = [
+    { id: 'A', container: true, depth: 0, rect: r(0, 300) },
+    { id: 'a1', parentId: 'A', container: false, depth: 1, rect: r(10, 100, 10, 580) },
+    { id: 'B', container: true, depth: 0, rect: r(320, 100) },
+    { id: 'C', container: true, depth: 0, rect: r(440, 100) },
+    { id: 'D', container: false, depth: 0, rect: r(560, 50) },
+  ]
+
+  it('snaps to the nearest boundary between root nodes, centred in the gap', () => {
+    const t = sortTarget(blocks, { x: 50, y: 500 }, 'B', '')! // pointer is deep inside container C
+    // siblings without B: A(0-300) C(440-540) D(560-610) -> boundaries 0, 370, 550, 610
+    expect(t.snaps!.map((s) => s.y + 1.5)).toEqual([0, 370, 550, 610])
+    expect(t).toMatchObject({ parentId: '', index: 2 }) // nearest is 550 (between C and D)
+    expect(t.line.y + 1.5).toBe(550)
+    expect(t.line.w).toBe(600)
+  })
+
+  it('snaps by distance to boundaries, not by sibling midpoints (stable near the edges)', () => {
+    expect(sortTarget(blocks, { x: 50, y: -40 }, 'B', '')!.index).toBe(0)
+    expect(sortTarget(blocks, { x: 50, y: 5000 }, 'B', '')!.index).toBe(3)
+    expect(sortTarget(blocks, { x: 50, y: 372 }, 'B', '')!.index).toBe(1)
+  })
+
+  it('excludes the dragged block, and a row of siblings sorts left to right', () => {
+    const row = [
+      { id: 'p', container: true, depth: 0, rect: r(0, 100, 0, 600) },
+      { id: 'c1', parentId: 'p', container: false, depth: 1, rect: r(0, 100, 0, 150) },
+      { id: 'c2', parentId: 'p', container: false, depth: 1, rect: r(0, 100, 200, 150) },
+      { id: 'c3', parentId: 'p', container: false, depth: 1, rect: r(0, 100, 400, 150) },
+    ]
+    const t = sortTarget(row, { x: 380, y: 50 }, 'c1', 'p')! // siblings: c2, c3
+    expect(t.snaps).toHaveLength(3)
+    expect(t.line.h).toBe(100) // a vertical line
+    expect(t.line.w).toBe(3)
+    expect(t).toMatchObject({ parentId: 'p', index: 1 }) // between c2 and c3
+    expect(t.line.x + 1.5).toBe(375) // centred in the 50px gap (350..400)
+  })
+
+  it('moveTarget: dragging a root block sorts by default and nests only with Alt', () => {
+    const sort = moveTarget(blocks, { x: 50, y: 500 }, { id: 'B' })!
+    expect(sort).toMatchObject({ parentId: '', index: 2 })
+    expect(sort.snaps).toBeDefined()
+    const nest = moveTarget(blocks, { x: 50, y: 500 }, { id: 'B' }, { nest: true })!
+    expect(nest.parentId).toBe('C') // the container under the pointer
+    expect(nest.snaps).toBeUndefined()
+  })
+
+  it('moveTarget: a nested block sorts inside its parent, and leaving the parent switches to general drops', () => {
+    const withSibs = [...blocks, { id: 'a2', parentId: 'A', container: false, depth: 1, rect: r(120, 100, 10, 580) }]
+    expect(moveTarget(withSibs, { x: 50, y: 250 }, { id: 'a1', parentId: 'A' })).toMatchObject({ parentId: 'A', index: 1 })
+    expect(moveTarget(withSibs, { x: 50, y: 380 }, { id: 'a1', parentId: 'A' })!.parentId).toBe('B') // left A: dropped into B
+  })
+
+  it('beside the page (over editor chrome) a root drag has no target', () => {
+    expect(rootExtent(blocks)).toMatchObject({ x: -24, w: 648 })
+    expect(moveTarget(blocks, { x: 900, y: 100 }, { id: 'B' })).toBeNull()
+  })
+})
diff --git a/test/onpage.test.tsx b/test/onpage.test.tsx
new file mode 100644
index 0000000..2915aa9
--- /dev/null
+++ b/test/onpage.test.tsx
@@ -0,0 +1,340 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+import { Icon, TypeIcon, registerTypeIcon } from '../src/ui/Icon'
+import { createRoot } from 'react-dom/client'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+const select = async (id: string) => {
+  await act(async () => void click(byId(id)))
+  await h.settle()
+}
+const q = (sel: string) => h.shadow.querySelector<HTMLElement>(sel)!
+const qa = (sel: string) => [...h.shadow.querySelectorAll<HTMLElement>(sel)]
+const kids = (id: string) => h.cms.graph.children(id).map((e) => e.to)
+/** jsdom has no layout: give elements rects. */
+const place = (id: string, x: number, y: number, w: number, hh: number) => {
+  byId(id).getBoundingClientRect = () => ({ x, y, left: x, top: y, right: x + w, bottom: y + hh, width: w, height: hh, toJSON() {} }) as DOMRect
+}
+const ptr = (type: string, x: number, y: number, el: EventTarget = document, altKey = false) => act(async () => void el.dispatchEvent(new MouseEvent(type, { bubbles: true, cancelable: true, clientX: x, clientY: y, altKey })))
+
+describe('icons', () => {
+  it('Icon renders an inline svg path; unknown names fall back; types get a guessed or registered icon', async () => {
+    const host = document.createElement('div')
+    const root = createRoot(host)
+    await act(async () => root.render(<><Icon name="edit" /><Icon name="nope" /><TypeIcon type="consulting-heading" /><TypeIcon type="weird" /><TypeIcon type="custom-x" /></>))
+    expect(host.querySelectorAll('svg path')).toHaveLength(5)
+    const d = [...host.querySelectorAll('path')].map((p) => p.getAttribute('d'))
+    expect(d[0]).not.toBe(d[1]) // edit vs fallback
+    expect(d[1]).toBe(d[3]) // unknown name and unknown type share the generic shape
+    expect(d[2]).not.toBe(d[3]) // "heading" guessed from the name
+    registerTypeIcon('custom-x', 'M0 0h24v24H0z')
+    await act(async () => root.render(<TypeIcon type="custom-x" />))
+    expect(host.querySelector('path')!.getAttribute('d')).toBe('M0 0h24v24H0z')
+  })
+})
+
+describe('toolbar overflow', () => {
+  it('JSON lives under the … menu, not in the toolbar', async () => {
+    h = await setup()
+    await h.settle()
+    await select('t1')
+    expect(h.shadow.querySelector('[role=toolbar] [aria-label="JSON"]')).toBeNull()
+    expect(h.shadow.querySelector('.cms-menu')).toBeNull()
+    await h.press('More actions')
+    expect(qa('.cms-menu [role=menuitem]').map((b) => b.textContent!.trim())).toEqual(['JSON', 'Copy node id'])
+    await act(async () => void qa('.cms-menu [role=menuitem]')[0].click())
+    await h.settle()
+    expect(h.shadow.querySelector('.cms-menu')).toBeNull() // closes on choice
+    expect(q('.cms-dialog').textContent).toContain('JSON')
+  })
+})
+
+describe('every property editable where it is rendered', () => {
+  it('binds nested properties to rendered text on selection and edits them in place with one click', async () => {
+    h = await setup()
+    await h.settle()
+    await select('f1')
+    const marked = [...byId('f1').querySelectorAll('[data-cms-inferred]')].map((e) => [e.getAttribute('data-cms-field'), e.textContent])
+    expect(marked).toEqual([['companyName', 'Mock AB'], ['links.0.text', 'About'], ['links.1.text', 'Careers']])
+    const about = byId('f1').querySelectorAll('a')[0] as HTMLElement
+    await act(async () => void click(about)) // block already selected: edits instead of selecting
+    await h.settle()
+    expect(about.getAttribute('contenteditable')).toBeTruthy()
+    about.textContent = 'About us'
+    about.dispatchEvent(new Event('input', { bubbles: true }))
+    h.editor.ctrl.stopInline()
+    await h.settle()
+    const links = h.cms.graph.node('f1').data.links
+    expect(links).toEqual([{ text: 'About us', href: 'https://example.com/about' }, { text: 'Careers', href: 'https://example.com/jobs', external: true }]) // siblings untouched
+    await h.press('Undo (Ctrl+Z)')
+    expect(h.cms.graph.node('f1').data.links[0].text).toBe('About')
+  })
+
+  it('markers follow the selection and are removed from the page when it moves on', async () => {
+    h = await setup()
+    await h.settle()
+    await select('f1')
+    expect(document.querySelectorAll('[data-cms-inferred]').length).toBe(3)
+    await select('t1')
+    expect(byId('f1').querySelectorAll('[data-cms-inferred]').length).toBe(0)
+  })
+
+  it('attribute-bound properties get a chip that edits them (href), nested paths included', async () => {
+    h = await setup()
+    await h.settle()
+    await select('f1')
+    const chips = qa('[aria-label="Edit href"]')
+    expect(chips).toHaveLength(2)
+    await act(async () => void chips[1].click())
+    await h.settle()
+    const input = q('.cms-dialog input') as HTMLInputElement
+    expect(input.value).toBe('https://example.com/jobs')
+    const set = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')!.set!
+    await act(async () => {
+      set.call(input, 'https://example.com/careers')
+      input.dispatchEvent(new Event('input', { bubbles: true }))
+    })
+    await act(async () => void q('.cms-dialog .cms-btn--primary').click())
+    await h.settle()
+    expect(h.cms.graph.node('f1').data.links[1]).toEqual({ text: 'Careers', href: 'https://example.com/careers', external: true })
+    expect(byId('f1').querySelectorAll('a')[1].getAttribute('href')).toBe('https://example.com/careers')
+  })
+
+  it('explicit template markers keep working (and are not double-bound)', async () => {
+    h = await setup()
+    await h.settle()
+    await select('h1')
+    expect(byId('h1').getAttribute('data-cms-inferred')).toBeNull()
+    expect(byId('h1').getAttribute('data-cms-field')).toBe('text')
+  })
+})
+
+describe('block palette and drag & drop', () => {
+  it('lists the types that fit the page, searchable', async () => {
+    h = await setup()
+    await h.settle()
+    await h.press('Blocks')
+    await h.settle()
+    const names = qa('.cms-block[data-type]').map((b) => b.dataset.type)
+    expect(names).toEqual(expect.arrayContaining(['heading', 'text', 'button', 'layout', 'footer']))
+    expect(names).not.toContain('page') // a page root is not a block you insert
+    const set = Object.getOwnPropertyDescriptor(HTMLInputElement.prototype, 'value')!.set!
+    await act(async () => {
+      set.call(q('[aria-label="Search blocks"]'), 'head')
+      q('[aria-label="Search blocks"]').dispatchEvent(new Event('input', { bubbles: true }))
+    })
+    expect(qa('.cms-block > span').map((s) => s.textContent)).toEqual(['Heading', 'Hero (heading + text + button)']) // title shown; the blueprint matches too
+  })
+
+  it('click adds to the selection: inside a container, otherwise after the block', async () => {
+    h = await setup()
+    await h.settle()
+    await h.press('Blocks')
+    await select('s1') // container
+    await act(async () => void q('.cms-block[data-type="button"]').click())
+    await h.settle()
+    expect(kids('s1')).toHaveLength(4)
+    await select('t2') // leaf: goes after it, in s2
+    await act(async () => void q('.cms-block[data-type="heading"]').click())
+    await h.settle()
+    expect(h.cms.graph.node(kids('s2')[1]).dataType).toBe('heading')
+  })
+
+  it('drag from the palette shows a ghost at the target and inserts at the drop index', async () => {
+    h = await setup()
+    await h.settle()
+    await h.press('Blocks')
+    place('s1', 0, 0, 600, 300)
+    place('h1', 10, 10, 580, 50)
+    place('t1', 10, 70, 580, 100)
+    place('b1', 10, 180, 580, 40)
+    h.editor.ctrl.scan()
+    const item = q('.cms-block[data-type="heading"]')
+    await ptr('pointerdown', 50, 400, item)
+    await ptr('pointermove', 50, 400) // under the threshold: nothing yet
+    expect(h.editor.ctrl.store.get().drag).toBeNull()
+    await ptr('pointermove', 80, 100) // past it: drag starts (this event only arms it) ...
+    await ptr('pointermove', 80, 100) // ... and the next one targets s1
+    const drag = h.editor.ctrl.store.get().drag!
+    expect(drag).toMatchObject({ source: 'palette', type: 'heading', target: { parentId: 's1', index: 1 } })
+    expect(q('.cms-ghost').textContent).toContain('New Heading')
+    await ptr('pointerup', 80, 100)
+    await h.settle()
+    const order = kids('s1')
+    expect(order).toHaveLength(4)
+    expect(h.cms.graph.node(order[1]).dataType).toBe('heading')
+    expect(h.editor.ctrl.store.get().drag).toBeNull()
+    expect(h.shadow.querySelector('.cms-ghost')).toBeNull()
+  })
+
+  it('Escape cancels a drag; a container that does not accept the type refuses it', async () => {
+    h = await setup()
+    await h.settle()
+    h.editor.ctrl.beginPaletteDrag({ type: 'heading', label: 'heading' })
+    expect(h.editor.ctrl.store.get().drag).not.toBeNull()
+    await act(async () => void document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true })))
+    expect(h.editor.ctrl.store.get().drag).toBeNull()
+    expect(h.editor.ctrl.accepts('s1', 'heading')).toBe(true)
+    expect(h.editor.ctrl.accepts('s1', 'page')).toBe(false)
+    expect(h.editor.ctrl.accepts('t1', 'heading')).toBe(false) // a leaf block holds nothing
+    expect(h.editor.ctrl.accepts('', 'anything')).toBe(true) // page root
+  })
+
+  it('moving an existing block uses the same engine and respects acceptance', async () => {
+    h = await setup()
+    await h.settle()
+    place('s1', 0, 0, 600, 300)
+    place('h1', 10, 10, 580, 50)
+    place('t1', 10, 70, 580, 100)
+    place('b1', 10, 180, 580, 40)
+    h.editor.ctrl.scan()
+    h.editor.ctrl.beginDrag('b1')
+    await ptr('pointermove', 80, 20)
+    expect(h.editor.ctrl.store.get().drag).toMatchObject({ source: 'block', id: 'b1', target: { parentId: 's1', index: 0 } })
+    await ptr('pointerup', 80, 20)
+    await h.settle()
+    expect(kids('s1')).toEqual(['b1', 'h1', 't1'])
+  })
+})
+
+describe('insertion slots (virtual "+" elements)', () => {
+  it('a selected container offers a slot between each child and at the end; a slot opens the picker at that index', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    expect(qa('.cms-slot').map((s) => s.getAttribute('aria-label'))).toEqual(['Add block at position 1', 'Add block at position 2', 'Add block at position 3', 'Add block at position 4'])
+    await act(async () => void qa('.cms-slot')[1].click())
+    await h.settle()
+    expect([...h.shadow.querySelectorAll('.cms-dialog h4')].map((x) => x.textContent)).toEqual(['Content', 'Layout', 'Blueprints']) // grouped by x-graph.group
+    await act(async () => void q('.cms-dialog .cms-tile[data-type="button"]').click())
+    await h.settle()
+    expect(h.cms.graph.node(kids('s1')[1]).dataType).toBe('button')
+    expect(kids('s1')).toHaveLength(4)
+  })
+
+  it('an empty container shows one big "Add block" slot', async () => {
+    h = await setup()
+    await h.settle()
+    await h.editor.ctrl.insert('s2', 'section')
+    await h.settle()
+    expect(qa('.cms-slot--empty')).toHaveLength(1)
+    expect(q('.cms-slot--empty').textContent).toContain('Add block')
+  })
+
+  it('leaf blocks show no slots', async () => {
+    h = await setup()
+    await h.settle()
+    await select('t1')
+    expect(qa('.cms-slot')).toHaveLength(0)
+  })
+})
+
+describe('sorting root nodes (snap between siblings)', () => {
+  const roots = () => {
+    place('s1', 0, 0, 600, 300)
+    place('h1', 10, 10, 580, 50)
+    place('t1', 10, 70, 580, 100)
+    place('b1', 10, 180, 580, 40)
+    place('s2', 0, 320, 600, 100)
+    place('t2', 10, 330, 580, 80)
+    place('l1', 0, 440, 600, 100) // a container: used to swallow the drop
+    place('x1', 10, 450, 280, 80)
+    place('x2', 310, 450, 280, 80)
+    place('f1', 0, 560, 600, 50)
+    h.editor.ctrl.scan()
+  }
+  const order = () => kids('p1')
+
+  it('dragging a root block over another container snaps between roots instead of nesting', async () => {
+    h = await setup()
+    await h.settle()
+    roots()
+    h.editor.ctrl.beginDrag('s2')
+    await ptr('pointermove', 80, 500) // deep inside the l1 container
+    const drag = h.editor.ctrl.store.get().drag!
+    expect(drag.target).toMatchObject({ parentId: '', index: 2 }) // siblings s1, l1, f1 -> between l1 and f1
+    expect(drag.target!.snaps).toHaveLength(4)
+    expect(h.shadow.querySelectorAll('.cms-snap')).toHaveLength(4)
+    expect(q('.cms-dragchip').textContent).toContain('sorting')
+    expect(q('.cms-dropline').style.top).toBe('548.5px') // centred in the 540..560 gap
+    await ptr('pointerup', 80, 500)
+    await h.settle()
+    expect(order()).toEqual(['s1', 'l1', 's2', 'f1'])
+    expect(kids('l1')).toEqual(['x1', 'x2']) // nothing was nested
+  })
+
+  it('the snap marker follows the nearest boundary as the pointer moves', async () => {
+    h = await setup()
+    await h.settle()
+    roots()
+    h.editor.ctrl.beginDrag('f1')
+    const idx = () => h.editor.ctrl.store.get().drag!.target!.index
+    await ptr('pointermove', 80, 20)
+    expect(idx()).toBe(0)
+    await ptr('pointermove', 80, 330)
+    expect(idx()).toBe(1)
+    await ptr('pointermove', 80, 450)
+    expect(idx()).toBe(2)
+    await ptr('pointerup', 80, 20)
+    await h.settle()
+    expect(order()).toEqual(['f1', 's1', 's2', 'l1'])
+  })
+
+  it('holding Alt nests into the container under the pointer; pressing/releasing Alt re-targets without a move', async () => {
+    h = await setup()
+    await h.settle()
+    roots()
+    h.editor.ctrl.beginDrag('s2')
+    await ptr('pointermove', 80, 500)
+    expect(h.editor.ctrl.store.get().drag!.target!.parentId).toBe('')
+    await act(async () => void document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Alt', bubbles: true })))
+    expect(h.editor.ctrl.store.get().drag!.target).toMatchObject({ parentId: 'l1' })
+    expect(q('.cms-dragchip').textContent).toContain('nesting')
+    expect(h.shadow.querySelectorAll('.cms-snap')).toHaveLength(0)
+    await act(async () => void document.dispatchEvent(new KeyboardEvent('keyup', { key: 'Alt', bubbles: true })))
+    expect(h.editor.ctrl.store.get().drag!.target!.parentId).toBe('')
+    await ptr('pointermove', 80, 500, document, true) // moving with Alt held nests
+    await ptr('pointerup', 80, 500, document, true)
+    await h.settle()
+    expect(kids('l1')).toContain('s2')
+    expect(order()).toEqual(['s1', 'l1', 'f1'])
+  })
+
+  it('dropping a root block where it already is changes nothing; over editor chrome there is no target', async () => {
+    h = await setup()
+    await h.settle()
+    roots()
+    const edits = () => h.editor.ctrl.store.get().log.filter((l) => l.url === '/api/edit').length
+    const before = edits()
+    h.editor.ctrl.beginDrag('s2')
+    await ptr('pointermove', 80, 300) // nearest boundary is its own slot
+    await ptr('pointerup', 80, 300)
+    await h.settle()
+    expect(edits()).toBe(before)
+    h.editor.ctrl.beginDrag('s2')
+    await ptr('pointermove', 900, 300) // beside the page: over the rail / panels
+    expect(h.editor.ctrl.store.get().drag!.target).toBeNull()
+    expect(q('.cms-dragchip').textContent).toContain('not here')
+    await ptr('pointerup', 900, 300)
+    await h.settle()
+    expect(edits()).toBe(before)
+  })
+
+  it('nested blocks sort among their siblings the same way, in a row too', async () => {
+    h = await setup()
+    await h.settle()
+    roots()
+    h.editor.ctrl.beginDrag('x1')
+    await ptr('pointermove', 520, 480) // right half of the row, over x2
+    const t = h.editor.ctrl.store.get().drag!.target!
+    expect(t).toMatchObject({ parentId: 'l1', index: 1 }) // after x2 (siblings without x1: x2 only)
+    expect(t.line.w).toBe(3) // a vertical line: the siblings are side by side
+    await ptr('pointerup', 520, 480)
+    await h.settle()
+    expect(kids('l1')).toEqual(['x2', 'x1'])
+  })
+})
diff --git a/test/registry.test.tsx b/test/registry.test.tsx
new file mode 100644
index 0000000..a9657b5
--- /dev/null
+++ b/test/registry.test.tsx
@@ -0,0 +1,85 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+import { attachDialog, registerEditor, registerFieldEditor } from '../src/registry'
+import { diffData } from '../src/diff'
+import { allowedChildren, fieldKind } from '../src/schema'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+describe('extension points', () => {
+  it('registerEditor adds a toolbar button for matching types only, and disposes cleanly', async () => {
+    h = await setup()
+    const off = registerEditor({ id: 't-heading', label: 'Heading tools', icon: 'H', match: 'heading', component: () => <p>heading dialog</p> })
+    await act(async () => void click(byId('h1')))
+    await h.settle()
+    expect(h.shadow.querySelector('[aria-label="Heading tools"]')).not.toBeNull()
+    await act(async () => void click(byId('t1')))
+    await h.settle()
+    expect(h.shadow.querySelector('[aria-label="Heading tools"]')).toBeNull()
+    off()
+    await act(async () => void click(byId('h1')))
+    await h.settle()
+    expect(h.shadow.querySelector('[aria-label="Heading tools"]')).toBeNull()
+  })
+
+  it('attachDialog attaches by selector and opens with the live node + schema', async () => {
+    h = await setup()
+    let seen: any
+    const off = attachDialog('.prose', ({ node, schema }) => ((seen = { id: node.id, type: node.dataType, props: Object.keys(schema.properties) }), <p>custom body editor</p>), { id: 'body-ed', label: 'Body' })
+    await act(async () => void click(byId('t1')))
+    await h.settle()
+    await h.press('Body')
+    expect(h.shadow.querySelector('.cms-dialog')!.textContent).toContain('custom body editor')
+    expect(seen).toEqual({ id: 't1', type: 'text', props: ['body'] })
+    off()
+  })
+
+  it('registerEditor with the same id replaces a built-in', async () => {
+    h = await setup()
+    registerEditor({ id: 'properties', label: 'Properties', match: '*', priority: 100, onDoubleClick: true, component: () => <p>my properties</p> })
+    await act(async () => void click(byId('t1')))
+    await h.press('Properties')
+    expect(h.shadow.querySelector('.cms-dialog')!.textContent).toContain('my properties')
+  })
+
+  it('field editors override form widgets by schema', async () => {
+    h = await setup()
+    const off = registerFieldEditor({
+      id: 'tone-swatches',
+      match: (s, path) => path === 'tone',
+      component: ({ value, onChange }) => (
+        <div className="swatches">
+          {['light', 'dark'].map((t) => (
+            <button type="button" key={t} aria-pressed={value === t} onClick={() => onChange(t)}>{t}</button>
+          ))}
+        </div>
+      ),
+    })
+    await act(async () => void click(byId('s1')))
+    await h.press('Properties')
+    expect(h.shadow.querySelector('.swatches')).not.toBeNull()
+    off()
+  })
+})
+
+describe('helpers', () => {
+  it('diffData: changed → value, removed → null, equal → omitted', () => {
+    expect(diffData({ a: 1, b: 2, c: { x: 1 } }, { a: 1, b: 3, c: { x: 1 } })).toEqual({ b: 3 })
+    expect(diffData({ a: 1, b: 2 }, { a: 1 })).toEqual({ b: null })
+    expect(diffData({}, { n: { x: 1 } })).toEqual({ n: { x: 1 } })
+  })
+  it('allowedChildren honours x-graph and "*"', () => {
+    expect(allowedChildren({ 'x-graph': { children: ['a'] } }, ['a', 'b'])).toEqual(['a'])
+    expect(allowedChildren({ 'x-graph': { children: ['*'] } }, ['a', 'b'])).toEqual(['a', 'b'])
+    expect(allowedChildren({}, ['a'])).toEqual([])
+  })
+  it('fieldKind picks widgets', () => {
+    expect(fieldKind({ type: 'string', format: 'markdown' })).toBe('markdown')
+    expect(fieldKind({ type: 'string', enum: ['a'] })).toBe('enum')
+    expect(fieldKind({ type: 'array' })).toBe('json')
+    expect(fieldKind({ type: ['string', 'null'] })).toBe('string')
+  })
+})
diff --git a/test/setup.ts b/test/setup.ts
new file mode 100644
index 0000000..5b0fbe8
--- /dev/null
+++ b/test/setup.ts
@@ -0,0 +1,10 @@
+// jsdom has no layout: give the few APIs the editor touches harmless defaults.
+if (!('scrollIntoView' in Element.prototype)) (Element.prototype as any).scrollIntoView = () => {}
+;(globalThis as any).IS_REACT_ACT_ENVIRONMENT = true
+
+// Store updates arrive from fetch/timers outside act(); the harness settles them explicitly.
+const error = console.error
+console.error = (...a: unknown[]) => {
+  if (typeof a[0] === 'string' && a[0].includes('not wrapped in act')) return
+  error(...a)
+}
diff --git a/test/style-editor.test.tsx b/test/style-editor.test.tsx
new file mode 100644
index 0000000..d057a19
--- /dev/null
+++ b/test/style-editor.test.tsx
@@ -0,0 +1,187 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { fireEvent } from '@testing-library/react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+const select = async (id: string) => {
+  await act(async () => void click(byId(id)))
+  await h.settle()
+}
+const data = (id: string) => h.cms.graph.node(id).data
+const editOps = () => h.editor.ctrl.store.get().log.filter((l) => l.url === '/api/edit').map((l) => (l.request as any).ops)
+const q = (sel: string) => h.shadow.querySelector<HTMLElement>(sel)!
+const chip = (field: string, label: string) => [...h.shadow.querySelectorAll<HTMLElement>(`[data-style-field="${field}"] .cms-chip`)].find((c) => c.textContent!.includes(label))!
+
+describe('Style panel (schema-driven)', () => {
+  it('loads schemas in the background and matches editors on the schema, not the node type', async () => {
+    h = await setup()
+    await h.settle()
+    expect(h.editor.ctrl.schemaOf('layout')).toBeDefined()
+    expect(h.editor.ctrl.wrapperType()).toBe('layout')
+    await select('l1')
+    expect(h.shadow.querySelector('[aria-label="Style"]')).not.toBeNull()
+    await select('t1') // a text block has no style fields
+    expect(h.shadow.querySelector('[aria-label="Style"]')).toBeNull()
+  })
+
+  it('chips write one token through set; reset clears it; the page re-renders with the new class', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    await h.press('Style')
+    expect(q('[data-style-field="gap"] .cms-chip.is-on').textContent).toBe('md')
+    await act(async () => void chip('gap', 'lg').click())
+    await h.settle()
+    expect(data('l1').gap).toBe('lg')
+    expect(byId('l1').className).toContain('k6n-gap-lg')
+    expect(editOps().at(-1)[0]).toMatchObject({ op: 'set', id: 'l1', data: { gap: 'lg' } })
+    await act(async () => void q('[aria-label="Reset Gap"]').click())
+    await h.settle()
+    expect('gap' in data('l1')).toBe(false)
+  })
+
+  it('flow chips hide legacy aliases; columns shows only for grid-like flows', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    await h.press('Style')
+    const labels = [...h.shadow.querySelectorAll('[data-style-field="flow"] .cms-chip')].map((c) => c.textContent)
+    expect(labels).toEqual(['Row', 'Stack', 'Actions'])
+    expect(h.shadow.querySelector('[data-style-field="columns"]')).not.toBeNull()
+    await act(async () => void chip('flow', 'Stack').click())
+    await h.settle()
+    expect(h.shadow.querySelector('[data-style-field="columns"]')).toBeNull()
+  })
+
+  it('box model: per-side selects, overrides show the inherited value, shared fields appear once', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    await h.press('Style')
+    const sel = (label: string) => h.shadow.querySelector<HTMLSelectElement>(`select[aria-label="${label}"]`)
+    // l1: padding sm, paddingTop lg (own), margin sm
+    expect(sel('padding top')!.value).toBe('lg')
+    expect(sel('padding bottom')!.value).toBe('') // inherits
+    expect(sel('padding bottom')!.options[0].text).toBe('sm (padding)')
+    expect(sel('padding all sides')!.value).toBe('sm') // one select for left+right, other edge shows a link
+    expect(h.shadow.querySelectorAll('.cms-box__link').length).toBeGreaterThan(0)
+    await act(async () => void fireEvent.change(sel('padding bottom')!, { target: { value: 'xl' } }))
+    await h.settle()
+    expect(data('l1').paddingBottom).toBe('xl')
+    await act(async () => void fireEvent.change(sel('padding top')!, { target: { value: '' } }))
+    await h.settle()
+    expect('paddingTop' in data('l1')).toBe(false)
+    expect(sel('padding top')!.options[0].text).toBe('sm (padding)')
+  })
+
+  it('breakpoint tabs edit responsive.<bp>.* and leave the base alone', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    await h.press('Style')
+    await act(async () => void [...h.shadow.querySelectorAll<HTMLElement>('[role=tab]')].find((t) => t.textContent === 'Tablet')!.click())
+    expect(h.shadow.querySelector('[data-style-field="gap"]')).toBeNull() // spacing has no per-breakpoint form
+    await act(async () => void chip('flow', 'Stack').click())
+    await h.settle()
+    expect(data('l1').responsive).toEqual({ tablet: { flow: 'stack' } })
+    expect(data('l1').flow).toBe('row')
+    expect(byId('l1').className).toContain('k6n-layout--t-stack')
+    await act(async () => void q('[aria-label="Reset Flow"]').click())
+    await h.settle()
+    expect('responsive' in data('l1')).toBe(false)
+  })
+
+  it('rapid clicks on one field coalesce into a single undo step', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    await h.press('Style')
+    for (const t of ['sm', 'lg', 'xl']) await act(async () => void chip('gap', t).click())
+    await h.settle()
+    expect(data('l1').gap).toBe('xl')
+    await h.press('Undo (Ctrl+Z)')
+    expect(data('l1').gap).toBe('md') // back to before the first click
+  })
+})
+
+describe('wrap in layout (give any block spacing)', () => {
+  it('wraps in one atomic batch, opens the Style panel, and undoes in one step', async () => {
+    h = await setup()
+    await h.settle()
+    await select('t2')
+    const edits = editOps().length
+    await h.press('Wrap in layout')
+    await h.settle()
+    const wrapper = byId('t2').closest('[data-cms-type="layout"]')!
+    expect(wrapper).not.toBeNull()
+    expect(wrapper.parentElement!.closest('[data-cms]')!.getAttribute('data-cms')).toBe('s2') // took t2's place
+    expect(editOps().length).toBe(edits + 1)
+    expect(editOps().at(-1).map((o: any) => o.op)).toEqual(['insert', 'move'])
+    expect(h.editor.ctrl.store.get().selected).toBe(wrapper.getAttribute('data-cms'))
+    expect(h.shadow.querySelector('.cms-dialog')!.textContent).toContain('Style')
+    await h.press('Undo (Ctrl+Z)')
+    expect(byId('t2').closest('[data-cms-type="layout"]')).toBeNull()
+    expect(byId('t2').parentElement!.getAttribute('data-cms')).toBe('s2')
+  })
+
+  it('is not offered for blocks that already have style fields', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    expect(h.shadow.querySelector('[aria-label="Wrap in layout"]')).toBeNull()
+  })
+})
+
+describe('on-page spacing handles', () => {
+  const grips = () => [...h.shadow.querySelectorAll<HTMLElement>('.cms-grip-h')]
+  const ptr = (el: Element, type: string, x: number, y: number) => act(async () => void el.dispatchEvent(new MouseEvent(type, { bubbles: true, cancelable: true, clientX: x, clientY: y })))
+
+  it('draws grips only for what the selected block can express', async () => {
+    h = await setup()
+    await h.settle()
+    await select('l1')
+    const labels = grips().map((g) => g.getAttribute('aria-label')!.split(':')[0])
+    expect(labels).toEqual(expect.arrayContaining(['padding top', 'padding bottom', 'padding (all sides)', 'margin top', 'margin bottom', 'margin (all sides)']))
+    await select('t1')
+    expect(grips()).toHaveLength(0)
+  })
+
+  it('dragging snaps to a token, previews live, and commits a single coalesced set', async () => {
+    h = await setup()
+    await h.settle()
+    // jsdom has no layout/CSS vars: give the page a measured scale and a computed padding-top of 32px.
+    const px: Record<string, number> = { none: 0, xs: 8, sm: 16, md: 32, lg: 64, xl: 96 }
+    h.editor.ctrl.measure = (v) => px[v.replace('--k6n-sp-', '')] ?? null
+    byId('l1').style.paddingTop = '32px'
+    await select('l1')
+    const top = () => grips().find((g) => g.getAttribute('aria-label')!.startsWith('padding top'))!
+    expect(top().getAttribute('aria-label')).toBe('padding top: 32px')
+    await ptr(top(), 'pointerdown', 50, 100)
+    await ptr(top(), 'pointermove', 50, 140) // +40px -> 72 -> nearest lg (64)
+    expect(byId('l1').style.getPropertyValue('padding-top')).toBe('64px') // live preview
+    expect(h.shadow.querySelector('.cms-tip')!.textContent).toContain('lg')
+    await ptr(top(), 'pointerup', 50, 140)
+    await h.settle()
+    expect(data('l1').paddingTop).toBe('lg') // paddingTop, not the shared padding
+    expect(data('l1').padding).toBe('sm')
+    expect(byId('l1').className).toContain('k6n-pt-lg')
+    expect(byId('l1').style.getPropertyValue('padding-top')).toBe('') // preview removed
+  })
+
+  it('a click without movement changes nothing; Escape/cancel removes the preview', async () => {
+    h = await setup()
+    await h.settle()
+    h.editor.ctrl.measure = () => 10
+    await select('l1')
+    const before = editOps().length
+    const g = grips()[0]
+    await ptr(g, 'pointerdown', 10, 10)
+    await ptr(g, 'pointerup', 10, 10)
+    await h.settle()
+    expect(editOps().length).toBe(before)
+  })
+})
diff --git a/test/style.test.ts b/test/style.test.ts
new file mode 100644
index 0000000..7b777cc
--- /dev/null
+++ b/test/style.test.ts
@@ -0,0 +1,178 @@
+import { describe, expect, it } from 'vitest'
+import { existsSync, readFileSync } from 'node:fs'
+import { schemas } from '../mock/fixtures'
+import { describeStyle, effective, fieldForSide, isWrapperSchema, patchFor } from '../src/style/model'
+import { discoverSpacingVar, measureScale, snap } from '../src/style/tokens'
+import type { Scale } from '../src/style/tokens'
+import { computeHandles, dragPx, gapsBetween, previewProperty } from '../src/style/handles'
+
+const layout = schemas.layout
+const fields = describeStyle(layout)
+const byName = (n: string) => fields.find((f) => f.name === n)!
+
+/** The same schema with every x-style removed: what an un-annotated deployment serves. */
+const stripped = () => {
+  const s = structuredClone(layout)
+  for (const p of Object.values<any>(s.properties)) delete p['x-style']
+  for (const p of Object.values<any>(s.$defs.breakpoint.properties)) delete p['x-style']
+  delete s['x-style']
+  return s
+}
+
+describe('describeStyle', () => {
+  it('reads x-style annotations: kinds, spacing box/side/overrides, token, breakpoints', () => {
+    expect(fields.map((f) => f.name)).toEqual(['flow', 'columns', 'gap', 'padding', 'paddingTop', 'paddingBottom', 'margin', 'marginTop', 'marginBottom', 'align', 'justify', 'tone', 'border'])
+    expect(byName('paddingTop')).toMatchObject({ kind: 'spacing', box: 'padding', side: 'top', overrides: 'padding', token: '--k6n-sp-{value}', inferred: false })
+    expect(byName('gap')).toMatchObject({ kind: 'gap', inferred: false })
+    expect(byName('flow').responsive).toEqual(['mobile', 'tablet', 'desktop'])
+    expect(byName('gap').responsive).toEqual([]) // spacing is not a breakpoint override (the template has no classes for it)
+    expect(isWrapperSchema(layout)).toBe(true)
+  })
+
+  it('infers the same fields from names + enums when the schema is not annotated (and says so)', () => {
+    const inferred = describeStyle(stripped())
+    expect(inferred.map((f) => [f.name, f.kind, f.box, f.side])).toEqual(fields.map((f) => [f.name, f.kind, f.box, f.side]))
+    expect(inferred.every((f) => f.inferred)).toBe(true)
+    expect(inferred.find((f) => f.name === 'marginBottom')).toMatchObject({ overrides: 'margin' })
+    expect(isWrapperSchema(stripped())).toBe(false) // the wrapper tag is never guessed
+  })
+
+  it('does not mistake ordinary fields for style (enum without a scale, unrelated names)', () => {
+    const s = { type: 'object', properties: { padding: { type: 'string' }, gap: { type: 'string', enum: ['a', 'b'] }, title: { type: 'string' }, variant: { enum: ['x', 'y'] } } }
+    expect(describeStyle(s)).toEqual([])
+  })
+
+  it('an annotation wins over naming (any property can be tagged)', () => {
+    const s = { type: 'object', properties: { inset: { type: 'string', enum: ['none', 'xs', 'sm', 'md'], 'x-style': { kind: 'spacing', box: 'padding', side: 'x' } } } }
+    expect(describeStyle(s)).toMatchObject([{ name: 'inset', kind: 'spacing', box: 'padding', side: 'x', inferred: false }])
+  })
+
+  const real = '/home/mats/git.k6n.net/ecommerce/data/k6n/schemas/layout.json'
+  it.skipIf(!existsSync(real))('the real k6n layout schema is annotated and consistent with the mock', () => {
+    const s = JSON.parse(readFileSync(real, 'utf8'))
+    const f = describeStyle(s)
+    expect(f.map((x) => x.name)).toEqual(expect.arrayContaining(fields.map((x) => x.name)))
+    expect(f.map((x) => x.name)).toContain('reveal')
+    expect(f.filter((x) => x.inferred)).toEqual([]) // fully annotated
+    expect(isWrapperSchema(s)).toBe(true)
+    expect(f.find((x) => x.name === 'paddingTop')).toMatchObject({ overrides: 'padding', token: '--k6n-sp-{value}' })
+  })
+})
+
+describe('values', () => {
+  it('effective() falls back from an override to its base field', () => {
+    const d = { padding: 'sm' }
+    expect(effective(d, fields, byName('paddingTop'))).toMatchObject({ value: 'sm', from: { name: 'padding' } })
+    expect(effective({ padding: 'sm', paddingTop: 'xl' }, fields, byName('paddingTop'))).toMatchObject({ value: 'xl', from: { name: 'paddingTop' } })
+    expect(effective({}, fields, byName('paddingTop')).value).toBeUndefined()
+  })
+
+  it('patchFor: base is flat (undefined clears), breakpoints rebuild responsive and prune empties', () => {
+    expect(patchFor({}, byName('gap'), 'lg')).toEqual({ gap: 'lg' })
+    expect(patchFor({}, byName('gap'), undefined)).toEqual({ gap: null })
+    const d = { responsive: { tablet: { columns: 2 }, mobile: { flow: 'stack' } } }
+    expect(patchFor(d, byName('columns'), 3, 'tablet')).toEqual({ responsive: { tablet: { columns: 3 }, mobile: { flow: 'stack' } } })
+    expect(patchFor(d, byName('columns'), undefined, 'tablet')).toEqual({ responsive: { mobile: { flow: 'stack' } } })
+    expect(patchFor({ responsive: { tablet: { columns: 2 } } }, byName('columns'), undefined, 'tablet')).toEqual({ responsive: null })
+    expect(d.responsive.tablet.columns).toBe(2) // input untouched
+  })
+
+  it('fieldForSide: exact side, then axis, then all', () => {
+    expect(fieldForSide(fields, 'padding', 'top')!.name).toBe('paddingTop')
+    expect(fieldForSide(fields, 'padding', 'left')!.name).toBe('padding')
+    expect(fieldForSide(fields, 'margin', 'bottom')!.name).toBe('marginBottom')
+    expect(fieldForSide(describeStyle({ type: 'object', properties: { gap: layout.properties.gap } }), 'padding', 'top')).toBeUndefined()
+  })
+})
+
+describe('token scales', () => {
+  const scale: Scale = { values: ['none', 'xs', 'sm', 'md', 'lg', 'xl'], px: [0, 8, 16, 32, 64, 96] }
+  it('snaps to the nearest measured size', () => {
+    expect(snap(scale, 'md', 32, 0)).toBe('md')
+    expect(snap(scale, 'md', 32, 12)).toBe('md') // 44 -> md(32) vs lg(64): md
+    expect(snap(scale, 'md', 32, 20)).toBe('lg') // 52 -> lg
+    expect(snap(scale, 'md', 32, -100)).toBe('none') // clamps at 0
+    expect(snap(scale, undefined, 0, 500)).toBe('xl')
+  })
+  it('steps ordinally when sizes cannot be measured', () => {
+    const blind: Scale = { values: scale.values, px: scale.values.map(() => null) }
+    expect(snap(blind, 'sm', 0, 0)).toBe('sm')
+    expect(snap(blind, 'sm', 0, 60)).toBe('lg') // 2 steps of 28px
+    expect(snap(blind, 'sm', 0, -500)).toBe('none')
+  })
+  it('measureScale resolves each value through the field token template', () => {
+    const asked: string[] = []
+    const sc = measureScale(byName('gap'), (v) => (asked.push(v), asked.length * 10))
+    expect(asked[0]).toBe('--k6n-sp-none')
+    expect(asked).toContain('--k6n-sp-md')
+    expect(sc.px).toEqual([10, 20, 30, 40, 50, 60])
+  })
+  it('discovers the spacing variable prefix from the page stylesheets', () => {
+    const style = { length: 2, 0: '--acme-sp-sm', 1: '--acme-sp-md' }
+    const doc = { styleSheets: [{ cssRules: [{ style }] }] } as unknown as Document
+    expect(discoverSpacingVar(doc)).toBe('--acme-sp-{value}')
+    expect(discoverSpacingVar({ styleSheets: [] } as unknown as Document)).toBeUndefined()
+  })
+})
+
+describe('handles', () => {
+  const rect = { x: 100, y: 200, w: 400, h: 300 }
+  const box = (t: number, r: number, b: number, l: number) => ({ top: t, right: r, bottom: b, left: l })
+  const base = { rect, padding: box(40, 20, 10, 20), margin: box(16, 0, 16, 0), children: [], fields }
+
+  it('creates a handle per side the schema can express, with the right field, axis and sign', () => {
+    const hs = computeHandles(base)
+    const get = (id: string) => hs.find((h) => h.id === id)!
+    expect(hs.filter((h) => h.kind === 'padding')).toHaveLength(4)
+    expect(get('padding-top')).toMatchObject({ axis: 'y', sign: 1, px: 40, shared: false, field: { name: 'paddingTop' } })
+    expect(get('padding-bottom')).toMatchObject({ axis: 'y', sign: -1, field: { name: 'paddingBottom' } })
+    expect(get('padding-left')).toMatchObject({ axis: 'x', sign: 1, shared: true, field: { name: 'padding' } }) // only "all" covers left/right
+    expect(get('padding-right')).toMatchObject({ axis: 'x', sign: -1, shared: true })
+    expect(get('margin-top')).toMatchObject({ axis: 'y', sign: -1 }) // margin grows outwards
+    expect(get('margin-bottom')).toMatchObject({ axis: 'y', sign: 1 })
+  })
+
+  it('places bands inside the box for padding and outside for margin, grips on the free edge', () => {
+    const hs = computeHandles(base)
+    const pt = hs.find((h) => h.id === 'padding-top')!
+    expect(pt.band).toEqual({ x: 100, y: 200, w: 400, h: 40 })
+    expect(pt.grip.y + pt.grip.h / 2).toBe(240) // centred on where the 40px ends
+    const mt = hs.find((h) => h.id === 'margin-top')!
+    expect(mt.band).toEqual({ x: 100, y: 184, w: 400, h: 16 })
+    expect(mt.grip.y + mt.grip.h / 2).toBe(184)
+  })
+
+  it('a zero-size value still gets a grabbable grip', () => {
+    const h = computeHandles({ ...base, padding: box(0, 0, 0, 0) }).find((x) => x.id === 'padding-top')!
+    expect(h.band.h).toBe(0)
+    expect(h.grip.h).toBeGreaterThanOrEqual(14)
+  })
+
+  it('no spacing fields -> no handles', () => {
+    expect(computeHandles({ ...base, fields: fields.filter((f) => f.kind === 'flow' || f.kind === 'columns') })).toEqual([])
+  })
+
+  it('gap bands come from the space between neighbouring children (rows and columns)', () => {
+    const c = (x: number, y: number) => ({ x, y, w: 100, h: 50 })
+    // 2x2 grid with a 20px column gap and a 10px row gap
+    const g = gapsBetween([c(0, 0), c(120, 0), c(0, 60), c(120, 60)])
+    expect(g.filter((x) => x.axis === 'x').map((x) => x.rect.w)).toEqual([20, 20])
+    expect(g.filter((x) => x.axis === 'y').map((x) => x.rect.h)).toEqual([10, 10])
+    expect(gapsBetween([c(0, 0)])).toEqual([])
+    const hs = computeHandles({ ...base, children: [c(0, 0), c(120, 0)] })
+    expect(hs.filter((h) => h.kind === 'gap')).toMatchObject([{ axis: 'x', px: 20, field: { name: 'gap' } }])
+  })
+
+  it('dragPx follows the sign and never goes negative', () => {
+    expect(dragPx({ axis: 'y', sign: 1, px: 40 }, 0, 25)).toBe(65)
+    expect(dragPx({ axis: 'y', sign: -1, px: 40 }, 0, 25)).toBe(15)
+    expect(dragPx({ axis: 'x', sign: 1, px: 10 }, -50, 99)).toBe(0)
+  })
+
+  it('previewProperty maps a field to the CSS property to preview', () => {
+    expect(previewProperty(byName('paddingTop'), 'top')).toBe('padding-top')
+    expect(previewProperty(byName('margin'), 'left')).toBe('margin')
+    expect(previewProperty(byName('gap'), 'gap')).toBe('gap')
+    expect(previewProperty({ ...byName('padding'), side: 'x' }, 'left')).toBe('padding-inline')
+  })
+})
diff --git a/test/titles.test.tsx b/test/titles.test.tsx
new file mode 100644
index 0000000..6dc2c6c
--- /dev/null
+++ b/test/titles.test.tsx
@@ -0,0 +1,190 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { act } from 'react'
+import { byId, click, setup } from './harness'
+import type { Harness } from './harness'
+import { OTHER_GROUP, groupOf, labelKey, sortGroups } from '../src/schema'
+import { schemas } from '../mock/fixtures'
+
+let h: Harness
+afterEach(() => h?.cleanup())
+
+const select = async (id: string) => {
+  await act(async () => void click(byId(id)))
+  await h.settle()
+}
+const q = (sel: string) => h.shadow.querySelector<HTMLElement>(sel)!
+const qa = (sel: string) => [...h.shadow.querySelectorAll<HTMLElement>(sel)]
+const label = (id: string) => h.editor.ctrl.labelFor(id)
+
+describe('x-graph label / group helpers', () => {
+  it('read the label property and the group from the schema; sort groups with the catch-all last', () => {
+    expect(labelKey({ 'x-graph': { group: 'Commerce', label: 'title' } })).toBe('title')
+    expect(groupOf({ 'x-graph': { group: 'Commerce', label: 'title' } })).toBe('Commerce')
+    expect(labelKey({ 'x-graph': {} })).toBeUndefined()
+    expect(labelKey(undefined)).toBeUndefined()
+    expect(groupOf({ 'x-graph': { group: 3 } })).toBeUndefined()
+    expect(sortGroups(['Layout', OTHER_GROUP, 'Commerce', 'Layout', 'Content'])).toEqual(['Commerce', 'Content', 'Layout', OTHER_GROUP])
+    expect(labelKey(schemas.footer)).toBe('companyName')
+  })
+})
+
+describe('node titles (x-graph.label)', () => {
+  it('loads every title with ONE tree request, not one request per block', async () => {
+    h = await setup()
+    await h.settle()
+    await h.settle()
+    expect(h.cms.requests.filter((r) => r.startsWith('GET /api/tree/')).length).toBe(1)
+    expect(h.cms.requests.filter((r) => /^GET \/api\/nodes\/[^/]+$/.test(r))).toEqual([])
+    expect(['s1', 'h1', 'b1', 'f1', 'l1'].map(label)).toEqual(['Welcome', 'Edit this headline', 'Get in touch', 'Mock AB', 'Two columns'])
+    expect(label('t1')).toBeUndefined() // the text type declares no label
+  })
+
+  it('shows the title in the outline (type as the secondary line), falling back to type + text', async () => {
+    h = await setup()
+    await h.settle()
+    await h.settle()
+    await h.press('Outline')
+    const items = qa('.cms-outline li button')
+    const s1 = items.find((b) => b.textContent!.includes('Welcome'))!
+    expect(s1.querySelector('.cms-outline__type')!.textContent).toBe('Welcome')
+    expect(s1.querySelector('.cms-outline__text')!.textContent).toBe('section')
+    const t1 = items.find((b) => b.querySelector('.cms-outline__type')!.textContent === 'text')!
+    expect(t1.querySelector('.cms-outline__text')!.textContent).toContain('A paragraph')
+  })
+
+  it('titles the toolbar chip (type and group in its tooltip), the hover tag and the dialog', async () => {
+    h = await setup()
+    await h.settle()
+    await h.settle()
+    await select('s1')
+    expect(q('.cms-bar__name').textContent).toBe('Welcome')
+    expect(q('.cms-bar__name').getAttribute('title')).toBe('section · Layout')
+    h.editor.ctrl.store.set({ hovered: 'f1' })
+    await h.settle()
+    const tag = q('.cms-frame__tag')
+    expect(tag.textContent).toContain('Mock AB')
+    expect(tag.textContent).toContain('footer')
+    expect(tag.querySelector('em')!.textContent).toBe('Layout')
+    await h.press('Properties')
+    expect(q('.cms-dialog__head').textContent).toContain('Properties · Welcome')
+    await select('t1')
+    expect(q('.cms-bar__name').textContent).toBe('text') // no label key: the type
+  })
+
+  it('titles follow edits live, and new nodes get theirs lazily', async () => {
+    h = await setup()
+    await h.settle()
+    await h.settle()
+    await select('s1')
+    await h.editor.ctrl.setData('s1', { title: 'Renamed' })
+    await h.settle()
+    await h.settle()
+    expect(label('s1')).toBe('Renamed')
+    expect(q('.cms-bar__name').textContent).toBe('Renamed')
+    const res = await h.editor.ctrl.insert('s2', 'button', { data: { label: 'Click me' } })
+    await h.settle()
+    const id = res!.results[0].node!
+    label(id) // first ask kicks off the fetch ...
+    await h.settle()
+    await h.settle()
+    expect(label(id)).toBe('Click me') // ... and it is there once loaded
+  })
+
+  it('long titles are shortened', async () => {
+    h = await setup()
+    await h.settle()
+    await h.editor.ctrl.setData('h1', { text: 'x'.repeat(80) })
+    await h.settle()
+    await h.settle()
+    expect(label('h1')!.length).toBe(40)
+    expect(label('h1')!.endsWith('…')).toBe(true)
+  })
+})
+
+describe('groups in the UI', () => {
+  it('the palette is grouped by x-graph.group (collapsible), blueprints last', async () => {
+    h = await setup()
+    await h.settle()
+    await h.press('Blocks')
+    await h.settle()
+    await h.settle()
+    const secs = qa('.cms-group-sec')
+    expect(secs.map((s) => s.querySelector('summary')!.textContent!.replace(/\s*\d+$/, '').trim())).toEqual(['Content', 'Layout', 'Blueprints'])
+    const inGroup = (g: string) => [...secs.find((s) => s.querySelector('summary')!.textContent!.startsWith(g))!.querySelectorAll<HTMLElement>('.cms-block')].map((x) => x.dataset.type)
+    expect(inGroup('Content')).toEqual(['heading', 'text', 'button'])
+    expect(inGroup('Layout')).toEqual(expect.arrayContaining(['section', 'layout', 'footer']))
+    expect(secs.every((s) => (s as HTMLDetailsElement).open)).toBe(true)
+    await act(async () => void ((secs[0].querySelector('summary') as HTMLElement).click()))
+    expect((secs[0] as HTMLDetailsElement).open).toBe(false)
+  })
+
+  it('the insert picker groups the allowed types too', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Add inside')
+    await h.settle()
+    await h.settle()
+    expect(qa('.cms-dialog h4').map((x) => x.textContent)).toEqual(['Content', 'Layout', 'Blueprints'])
+    expect(qa('.cms-dialog .cms-tile').map((x) => x.dataset.type)).toEqual(['heading', 'text', 'button', 'section', 'layout', undefined]) // + the blueprint tile
+  })
+})
+
+describe('the block list shows titles and groups straight from /api/types', () => {
+  it('seeds every schema from the one types request - no per-type schema fetches for the palette', async () => {
+    h = await setup()
+    await h.settle()
+    await h.press('Blocks')
+    await h.settle()
+    await h.settle()
+    // /api/types carries each type's schema: types that are not on the page are never fetched individually
+    expect(h.cms.requests.filter((r) => r.startsWith('GET /api/schemas/page'))).toEqual([])
+    expect(h.cms.requests.filter((r) => r === 'GET /api/types').length).toBe(1)
+    expect(h.editor.ctrl.schemaOf('page')).toBeDefined()
+    expect(h.editor.ctrl.groupOfType('page')).toBe('Pages')
+  })
+
+  it('palette items show the schema title with the type id underneath (disambiguates look-alikes)', async () => {
+    h = await setup()
+    await h.settle()
+    await h.press('Blocks')
+    await h.settle()
+    const heading = q('.cms-block[data-type="heading"]')
+    expect(heading.querySelector('span')!.textContent).toBe('Heading')
+    expect(heading.querySelector('small')!.textContent).toBe('heading')
+    expect(heading.getAttribute('title')).toBe('Add Heading')
+    expect(h.editor.ctrl.typeTitle('footer')).toBe('Footer')
+    expect(h.editor.ctrl.typeTitle('unknown-type')).toBe('unknown-type')
+  })
+
+  it('page-root (staticRoot) types are not offered, even where a container would accept anything', async () => {
+    h = await setup()
+    await h.settle()
+    expect(h.editor.ctrl.isStaticRoot('page')).toBe(true)
+    expect(h.editor.ctrl.isStaticRoot('heading')).toBe(false)
+    await h.press('Blocks')
+    await h.settle()
+    expect(qa('.cms-block[data-type="page"]')).toHaveLength(0)
+    expect(qa('.cms-group-sec summary').map((s) => s.textContent)).not.toContain('Pages')
+  })
+
+  it('the insert picker shows titles too', async () => {
+    h = await setup()
+    await h.settle()
+    await select('s1')
+    await h.press('Add inside')
+    await h.settle()
+    const tile = q('.cms-dialog .cms-tile[data-type="layout"]')
+    expect(tile.querySelector('span')!.textContent).toBe('Layout')
+    expect(tile.querySelector('small')!.textContent).toBe('layout')
+  })
+
+  it('ingestTypes tolerates entries without a schema (they stay "Other" until loaded)', async () => {
+    h = await setup()
+    await h.settle()
+    h.editor.ctrl.ingestTypes([{ type: 'mystery' }, 'bare-string', { type: 'with', schema: { title: 'With', 'x-graph': { group: 'Odd' } } }])
+    expect(h.editor.ctrl.groupOfType('mystery')).toBe('Other')
+    expect(h.editor.ctrl.groupOfType('with')).toBe('Odd')
+    expect(h.editor.ctrl.typeTitle('with')).toBe('With')
+  })
+})
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..c1b512a
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2023", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUncheckedIndexedAccess": false,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "allowImportingTsExtensions": true,
+    "noEmit": true,
+    "types": ["vite/client", "node"],
+    "baseUrl": ".",
+    "paths": { "@k6n/cms-editor": ["../ecommerce/backoffice/web/packages/cms-editor/src/index.ts"] }
+  },
+  "include": ["src", "mock", "vite", "vite.config.ts", "test"]
+}
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..7655711
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,46 @@
+import { defineConfig, loadEnv, type UserConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import path from 'node:path'
+import { cmsLivePlugin } from './vite/live'
+import { cmsMockPlugin } from './vite/mock'
+
+export default defineConfig(({ command, mode }): UserConfig => {
+  const env = { ...loadEnv(mode, process.cwd(), ''), ...process.env } as Record<string, string>
+  const editorSrc = path.resolve(env.CMS_EDITOR_SRC || '../ecommerce/backoffice/web/packages/cms-editor/src')
+  const common: UserConfig = {
+    plugins: [react()],
+    resolve: {
+      alias: { '@k6n/cms-editor': path.join(editorSrc, 'index.ts') },
+      // The shared package imports tiptap from its own location; keep a single copy.
+      dedupe: ['react', 'react-dom', '@tiptap/core', '@tiptap/pm'],
+    },
+    server: { port: 5173, strictPort: true /* the issuer's CORS allowlist names localhost:5173 */, fs: { allow: [process.cwd(), path.resolve(editorSrc, '..')] } },
+    test: {
+      environment: 'jsdom',
+      environmentOptions: { jsdom: { pretendToBeVisual: true } },
+      include: ['test/**/*.test.{ts,tsx}', 'src/**/*.test.{ts,tsx}', 'mock/**/*.test.ts'],
+      setupFiles: ['test/setup.ts'],
+    },
+  } as UserConfig
+
+  if (command === 'build') {
+    // The artifact served at /editor/onpage-editor.js. One self-contained file;
+    // only loaded when the preview cookie is present (see src/main.ts).
+    return {
+      ...common,
+      define: { 'process.env.NODE_ENV': '"production"' },
+      build: {
+        outDir: 'dist',
+        lib: { entry: 'src/main.ts', formats: ['es'], fileName: () => 'onpage-editor.js' },
+        sourcemap: true,
+        cssCodeSplit: false,
+      },
+    }
+  }
+
+  const mock = (env.CMS_MODE || 'live') === 'mock'
+  return {
+    ...common,
+    plugins: [...(common.plugins ?? []), mock ? cmsMockPlugin() : cmsLivePlugin(env)],
+  }
+})
diff --git a/vite/live.ts b/vite/live.ts
new file mode 100644
index 0000000..1a7a52a
--- /dev/null
+++ b/vite/live.ts
@@ -0,0 +1,91 @@
+// Dev server for the *live* CMS: everything is proxied to CMS_TARGET, and the
+// page HTML (which the proxy can't rewrite reliably - compression, streaming)
+// is fetched server-side so the editor's dev entry can be injected into it.
+//
+// Auth never reaches the browser: CMS_TOKEN / CMS_API_KEY / CMS_COOKIE are added
+// to every upstream request here.
+import type { Plugin, ViteDevServer } from 'vite'
+import type { IncomingMessage, ServerResponse } from 'node:http'
+import { injectDevEntry, isPageRequest, isViteOwned, upstreamHeaders } from './shared'
+
+export function cmsLivePlugin(env: Record<string, string>): Plugin {
+  const target = (env.CMS_TARGET || 'https://k6n.net').replace(/\/$/, '')
+  const fixed = { token: env.CMS_TOKEN, apiKey: env.CMS_API_KEY, cookie: env.CMS_COOKIE }
+  // Token the browser got through the in-editor device login (POST /__dev/token). Env credentials win.
+  let runtimeToken: string | undefined
+  const creds = () => ({ ...fixed, token: fixed.token || runtimeToken })
+
+  return {
+    name: 'cms-live',
+    config: () => ({
+      server: {
+        proxy: {
+          // Anything Vite doesn't own goes to the real site (assets, /api, /editor, fonts...).
+          '^/(?!@|src/|node_modules/|__).*': {
+            target,
+            changeOrigin: true,
+            secure: true,
+            cookieDomainRewrite: '',
+            cookiePathRewrite: '/',
+            bypass: (req) => (isViteOwned(req.url ?? '') ? req.url : undefined),
+            configure: (proxy) => {
+              proxy.on('proxyReq', (proxyReq, req) => {
+                const h = upstreamHeaders(req.headers, creds())
+                for (const [k, v] of Object.entries(h)) proxyReq.setHeader(k, v)
+              })
+            },
+          },
+        },
+      },
+    }),
+    configureServer(server: ViteDevServer) {
+      // Registered directly (not in a returned fn) so it runs BEFORE the proxy.
+      server.middlewares.use(async (req: IncomingMessage, res: ServerResponse, next) => {
+        if (req.url === '/__dev/token') {
+          if (req.method === 'DELETE') runtimeToken = undefined
+          else if (req.method === 'POST') {
+            const chunks: Buffer[] = []
+            for await (const c of req) chunks.push(c as Buffer)
+            try {
+              runtimeToken = (JSON.parse(Buffer.concat(chunks).toString()) as { accessToken?: string }).accessToken
+            } catch {
+              /* ignore malformed */
+            }
+          }
+          res.statusCode = 204
+          return void res.end()
+        }
+        if (!isPageRequest(req)) return next()
+        try {
+          const upstream = await fetch(target + req.url, {
+            headers: upstreamHeaders(req.headers, creds(), { identity: true }),
+            redirect: 'manual',
+          })
+          const type = upstream.headers.get('content-type') ?? ''
+          res.statusCode = upstream.status
+          upstream.headers.forEach((v, k) => {
+            // fetch() already decoded the body; CSP would block our injected module.
+            if (['content-encoding', 'content-length', 'transfer-encoding', 'content-security-policy', 'strict-transport-security'].includes(k)) return
+            if (k === 'location') v = v.replace(target, '')
+            if (k === 'set-cookie') return
+            res.setHeader(k, v)
+          })
+          for (const c of upstream.headers.getSetCookie()) {
+            res.appendHeader('set-cookie', c.replace(/;\s*domain=[^;]*/i, '').replace(/;\s*secure/i, ''))
+          }
+          let body = await upstream.text()
+          if (type.includes('text/html')) {
+            body = await server.transformIndexHtml(req.url!, injectDevEntry(body))
+            res.setHeader('x-cms-dev', 'injected')
+            res.setHeader('cache-control', 'no-store') // never let the browser reuse a stale published page
+          }
+          res.end(body)
+        } catch (e) {
+          res.statusCode = 502
+          res.setHeader('content-type', 'text/plain')
+          res.end(`dev proxy: cannot reach ${target}: ${(e as Error).message}`)
+        }
+      })
+    },
+  }
+}
diff --git a/vite/mock.ts b/vite/mock.ts
new file mode 100644
index 0000000..db17cd7
--- /dev/null
+++ b/vite/mock.ts
@@ -0,0 +1,39 @@
+// `npm run dev:mock`: no network, no login. Serves a fixture page and the mock API.
+import type { Plugin } from 'vite'
+import { createMockCms } from '../mock/server'
+import { injectDevEntry } from './shared'
+
+export function cmsMockPlugin(): Plugin {
+  // CMS_MOCK_AUTH=1 makes the mock require the device-login flow (approve on the mock /device page) so the login UI can be developed.
+  const cms = createMockCms(process.env.CMS_MOCK_AUTH ? { auth: true } : {})
+  return {
+    name: 'cms-mock',
+    configureServer(server) {
+      server.middlewares.use(async (req, res, next) => {
+        const url = req.url ?? '/'
+        if (url.startsWith('/__dev/')) return void ((res.statusCode = 204), res.end())
+        const isApi = url.startsWith('/api/')
+        const isReset = url === '/__mock/reset' && req.method === 'POST'
+        const isMock = url === '/device' || url.startsWith('/device?') || url === '/__mock/approve'
+        const isPage = req.method === 'GET' && !/^\/(@|src\/|node_modules\/|mock\/|__)/.test(url) && String(req.headers.accept ?? '').includes('text/html')
+        if (!isApi && !isReset && !isPage && !isMock) return next()
+        if (isReset) {
+          cms.reset()
+          res.statusCode = 204
+          return void res.end()
+        }
+        const chunks: Buffer[] = []
+        for await (const c of req) chunks.push(c as Buffer)
+        const body = chunks.length ? Buffer.concat(chunks) : undefined
+        const resp = await cms.handle(
+          new Request(new URL(url, `http://${req.headers.host ?? 'localhost'}`), { method: req.method, headers: req.headers as Record<string, string>, body: body && req.method !== 'GET' ? body : undefined }),
+        )
+        res.statusCode = resp.status
+        resp.headers.forEach((v, k) => res.setHeader(k, v))
+        let text = await resp.text()
+        if (resp.headers.get('x-cms-page')) text = await server.transformIndexHtml(url, injectDevEntry(text))
+        res.end(text)
+      })
+    },
+  }
+}
diff --git a/vite/shared.ts b/vite/shared.ts
new file mode 100644
index 0000000..3079220
--- /dev/null
+++ b/vite/shared.ts
@@ -0,0 +1,48 @@
+import type { IncomingHttpHeaders, IncomingMessage } from 'node:http'
+
+/** Paths Vite itself serves (HMR client, source modules, deps). */
+export const isViteOwned = (url: string) =>
+  /^\/(@|src\/|node_modules\/|__|mock\/|test\/)/.test(url)
+
+/** A navigation to a page we should fetch + inject, as opposed to an asset/API call. */
+export function isPageRequest(req: IncomingMessage): boolean {
+  const url = req.url ?? '/'
+  if (req.method !== 'GET' || isViteOwned(url)) return false
+  if (/^\/(api|editor|assets|js|css|fonts|static)(\/|$)/.test(url)) return false
+  if (/\.[a-z0-9]{2,5}($|\?)/i.test(url.split('?')[0])) return false // has a file extension
+  return String(req.headers.accept ?? '').includes('text/html')
+}
+
+export interface Auth {
+  token?: string
+  apiKey?: string
+  cookie?: string
+}
+
+const hasPreviewCookie = (cookie?: string) => /(?:^|;\s*)cms_preview=1/.test(cookie ?? '')
+
+/** Headers for an upstream request: browser cookies + configured credentials + preview flag. */
+export function upstreamHeaders(
+  incoming: IncomingHttpHeaders,
+  auth: Auth,
+  opts: { identity?: boolean } = {},
+): Record<string, string> {
+  const h: Record<string, string> = {}
+  if (incoming.accept) h.accept = String(incoming.accept)
+  if (incoming['accept-language']) h['accept-language'] = String(incoming['accept-language'])
+  if (opts.identity) h['accept-encoding'] = 'identity'
+  const cookie = [incoming.cookie, auth.cookie].filter(Boolean).join('; ')
+  if (cookie) h.cookie = cookie
+  // The edge routes on the cookie OR this header; send both so a proxy hop can't lose it.
+  if (hasPreviewCookie(cookie)) h['x-cms-preview'] = '1'
+  if (auth.token) h.authorization = `Bearer ${auth.token}`
+  else if (incoming.authorization) h.authorization = String(incoming.authorization)
+  if (auth.apiKey) h['x-api-key'] = auth.apiKey
+  return h
+}
+
+/** Put the dev entry in front of </body> (or at the end). */
+export function injectDevEntry(html: string): string {
+  const tag = '<script type="module" src="/src/dev.ts"></script>'
+  return /<\/body>/i.test(html) ? html.replace(/<\/body>/i, `${tag}</body>`) : html + tag
+}