PMDevSolutions · PAMulligan · Jun 11, 2026 · Jun 11, 2026 · Jun 11, 2026 · Jun 11, 2026
diff --git a/docs/astro.config.mjs b/docs/astro.config.mjs
@@ -40,7 +40,10 @@ export default defineConfig({
         },
         {
           label: "Configuration",
-          items: [{ autogenerate: { directory: "configuration" } }],
+          items: [
+            { autogenerate: { directory: "configuration" } },
+            { label: "Theme editor", link: "/theme-editor/" },
+          ],
         },
         {
           label: "Deployment",

diff --git a/docs/plans/2026-06-11-theming-v2-design.md b/docs/plans/2026-06-11-theming-v2-design.md
@@ -0,0 +1,105 @@
+# Theming v2 Design (issue #73)
+
+Design tokens via CSS custom properties, schema-validated theme files, four
+built-in themes, a theme editor, and a documented migration path from the
+`accentColor`-only API.
+
+## Constraints
+
+- **No breaking changes.** The CDN `@1` channel auto-updates production sites.
+  `theme: "light" | "dark" | "auto"`, `accentColor`, and the existing
+  `--claudius-*` custom properties must keep working unchanged.
+- Default appearance must be pixel-identical before/after the refactor; the
+  existing 220 widget tests are the regression net.
+
+## Token set (`--cl-*`)
+
+| Group | Tokens | Notes |
+|-------|--------|-------|
+| Colors | `accent`, `accent-text`, `surface`, `surface-muted`, `text`, `text-muted`, `border`, `user-bubble`, `user-bubble-text`, `assistant-bubble`, `assistant-bubble-text`, `error`, `error-surface`, `scrim` | `user-bubble` defaults to `var(--cl-color-accent)`; `assistant-bubble` to `surface-muted` (fixes the wart where `accentColor` recolored the header but not user bubbles) |
+| Radii | `sm` (8px), `md` (12px), `lg` (16px), `full` (9999px), `tail` (2px) | window/bubbles=lg, buttons/inputs=md, bubble tail=tail |
+| Shadows | `elevated` (window), `floating` (toggle), `floating-hover` | |
+| Fonts | `heading`, `body` | carried over from `--claudius-font-*` |
+
+**Dark mode:** light values are token defaults; `[data-claudius-dark="true"]`
+reassigns each color token to `var(--cl-color-<name>-dark, <current dark value>)`.
+The wrapper splits into an outer div carrying inline theme vars and an inner
+div carrying `data-claudius-dark`, so the attribute rule beats inherited
+inline light values. Today's hard-coded `dark:` utilities become the `-dark`
+defaults, keeping default dark mode pixel-identical.
+
+**Legacy aliases:** Tailwind palette entries become fallback chains, e.g.
+`var(--claudius-primary, var(--cl-color-accent, #2563eb))` — anyone setting
+`--claudius-*` externally keeps working and still wins.
+
+## API
+
+```ts
+type ClaudiusThemeInput =
+  | "light" | "dark" | "auto"                       // existing: mode only
+  | "default" | "minimal" | "playful" | "corporate" // built-in themes
+  | ClaudiusTheme                                   // inline token object
+  | (string & {});                                  // URL to a theme JSON
+
+interface ClaudiusTheme {
+  $schema?: string;
+  name?: string;
+  colorScheme?: "light" | "dark" | "auto";  // defaults to "light"
+  colors?: Partial<Record<ThemeColorToken, string>>;     // camelCase keys
+  colorsDark?: Partial<Record<ThemeColorToken, string>>; // dark overrides
+  radii?: Partial<Record<"sm" | "md" | "lg" | "full" | "tail", string>>;
+  shadows?: Partial<Record<"elevated" | "floating" | "floatingHover", string>>;
+  fonts?: Partial<Record<"heading" | "body", string>>;
+}
+```
+
+- Strings `light|dark|auto` keep their exact current meaning (mode only).
+- Built-in names resolve to exported theme objects (`builtinThemes`); each
+  carries its own `colorScheme`. Combining a built-in with a different mode:
+  `theme={{ ...builtinThemes.corporate, colorScheme: "dark" }}`.
+- Any other string is treated as a URL: fetched, JSON-parsed, structurally
+  checked. On fetch/parse/shape failure: console.error and fall back to the
+  default theme — the widget never breaks because a theme file is down.
+- `accentColor` still works and **wins over** the theme's accent (it is the
+  older, more specific contract). Internally it now sets `--cl-color-accent`.
+- Web component: `theme` attribute accepts mode strings, built-in names, and
+  URLs (attributes can't express objects; documented).
+- Package exports gain `ClaudiusTheme` and `builtinThemes`.
+
+## Built-in themes
+
+- `default` — empty overrides (the baked-in defaults)
+- `minimal` — monochrome: near-black accent, square-ish radii (4/6/10px), hairline shadows
+- `playful` — violet accent, pill radii (16/20/24px), soft colored shadows, rounded font stack
+- `corporate` — navy accent, tight radii (4/6/8px), subtle shadows, neutral grays
+
+## Schema
+
+JSON Schema draft-07 (same dialect as `clients/_schema.json`), source of truth
+at `widget/src/theme/theme.v1.schema.json`, committed copy served from
+`docs/public/schema/theme.v1.json` → published at
+`https://claudius-docs.pages.dev/schema/theme.v1.json` (the issue's
+`claudius.dev` host doesn't exist yet; same "or equivalent" precedent as #74 —
+when the domain is attached the path carries over). A widget test asserts the
+two files are byte-identical (drift guard, no cross-package build coupling).
+All leaf values: non-empty strings (CSS color syntax is too varied to regex);
+`additionalProperties: false` everywhere catches typos. Runtime widget
+validation is a lightweight structural check (no AJV in the bundle); AJV is a
+widget devDependency for tests, which validate all four built-ins against the
+schema.
+
+## Theme editor
+
+A custom docs-site page at `/theme-editor/` (Starlight `<StarlightPage>` +
+vanilla JS island): grouped controls for all tokens (light + dark), a live
+preview pane — a static widget replica styled exclusively by the same
+`--cl-*` tokens — and export as download/copy of a JSON file containing only
+non-default values plus `$schema`. Built-ins selectable as starting points.
+The issue places the editor on the playground site, which doesn't exist yet
+(#48/#83); the docs site is its interim home, and the editor moves when the
+playground lands.
+
+## Out of scope
+
+- Playground site itself (#48/#83); per-tenant theme storage; CLI validation
+  of theme files (possible follow-up to `pnpm claudius validate`).
diff --git a/docs/plans/2026-06-11-theming-v2-implementation.md b/docs/plans/2026-06-11-theming-v2-implementation.md
@@ -0,0 +1,47 @@
+# Theming v2 Implementation Plan (issue #73)
+
+> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** Design-token theming per `2026-06-11-theming-v2-design.md`, fully backward compatible.
+
+**Architecture:** Tokens defined in `styles.css` (light defaults + dark reassignment block), consumed via Tailwind theme mappings; a small theme module (`widget/src/theme/`) resolves the `theme` prop union into CSS vars applied inline on a new outer wrapper; schema + docs + editor ride on the docs site.
+
+**Tech Stack:** Tailwind 3 custom properties, Vitest (+ AJV for schema tests), Astro/Starlight custom page.
+
+---
+
+### Task 1: Token foundation (no behavior change)
+
+**Files:** `widget/src/styles.css`, `widget/tailwind.config.ts`, all `widget/src/components/*.tsx` (class refactor), `widget/src/components/ChatWidget.tsx` (wrapper split).
+
+1. Add to `styles.css`: `:where()` -scoped token defaults? No — tokens must inherit into the widget subtree only: define defaults on the outer wrapper class `.claudius-root` (light values) and a `[data-claudius-dark="true"]` block reassigning color tokens to `var(--cl-color-X-dark, <dark default>)`.
+2. Rewrite `tailwind.config.ts`: semantic classes (`claudius-surface`, `claudius-text`, …) → `var(--cl-*)`; keep legacy `claudius-*` entries as `var(--claudius-X, var(--cl-*, default))` chains; radii/shadows/fonts from tokens.
+3. Component sweep: replace every hard-coded color/`dark:` pair with token classes (mapping table in design doc); `rounded-2xl`→`rounded-claudius-lg`, `shadow-2xl`→`shadow-claudius-elevated`, etc.
+4. ChatWidget: split wrapper (`<div className="claudius-root" style={vars}>` outer, inner keeps `data-claudius-dark`); `accentColor` now sets `--cl-color-accent`.
+5. Run `pnpm test` (220 green), `pnpm lint`, `pnpm typecheck`, `pnpm build`. Commit: `refactor(widget): move all visual styles onto --cl-* design tokens`.
+
+### Task 2: Theme engine (TDD)
+
+**Files:** `widget/src/theme/types.ts`, `themes.ts` (builtins), `resolve.ts` (`resolveThemeInput`, `themeToCssVars`), `__tests__/resolve.test.ts`, `__tests__/themes.test.ts`; export from `widget/src/index.ts`.
+
+Tests first: mode strings → `{mode, theme: undefined}`; builtin names → builtin object; objects pass through; `themeToCssVars` maps camelCase→`--cl-color-kebab` (+`-dark` from `colorsDark`, radii/shadows/fonts groups); unknown keys warned & skipped; non-string values skipped. Commit per red-green cycle.
+
+### Task 3: theme prop + URL fetch (TDD)
+
+**Files:** `widget/src/theme/useTheme.ts` (hook: resolves input, fetches URLs with AbortController, falls back to default on any failure with one console.error), `ChatWidget.tsx` wiring (mode resolution: object `colorScheme` feeds existing light/dark/auto logic), `embed.tsx` (config + attribute pass-through), tests in `hooks/__tests__/` and `__tests__/embed.test.tsx`.
+
+Key tests: `theme="corporate"` sets vars on wrapper; URL success applies fetched tokens; URL 404/invalid-JSON/bad-shape → defaults + error logged; `accentColor` overrides theme accent; `theme="dark"` regression (mode only, attr set); web component `theme="minimal"` works.
+
+### Task 4: Schema + validation tests
+
+**Files:** `widget/src/theme/theme.v1.schema.json`, copy at `docs/public/schema/theme.v1.json`, `widget/src/theme/__tests__/schema.test.ts` (AJV devDep: all builtins + a kitchen-sink fixture validate; bad fixtures fail; docs copy byte-identical).
+
+### Task 5: Docs + theme editor
+
+**Files:** `docs/src/content/docs/configuration/theming.md` (rewrite: tokens table, theme prop forms, builtins gallery, schema link), `docs/src/content/docs/migration/accent-color-to-themes.md`, `docs/src/pages/theme-editor.astro` (+ sidebar link in `docs/astro.config.mjs`), `docs/src/content/docs/api/widget.md` (type updates).
+
+Editor: token controls grouped (colors light/dark tabs, radii, shadows, fonts), static preview replica driven by the same tokens, export = JSON of non-default values + `$schema`, builtin starting points. `pnpm build` green.
+
+### Task 6: Verify + PR
+
+Widget: test/lint/typecheck/build. Worker tests (untouched). Docs build. Push `73-theming-v2-design-tokens`, PR body includes `Closes #73` (criteria fully met by the PR per [[feedback-close-issues-via-pr-keyword]] — schema URL goes live on merge via docs auto-deploy).
diff --git a/docs/public/schema/theme.v1.json b/docs/public/schema/theme.v1.json
@@ -0,0 +1,81 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "https://claudius-docs.pages.dev/schema/theme.v1.json",
+  "title": "Claudius Theme",
+  "description": "Design-token theme for the Claudius chat widget. Every value is a CSS string applied through a --cl-* custom property. `colors` apply to both light and dark modes unless `colorsDark` overrides a token for dark mode.",
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "$schema": { "type": "string" },
+    "name": {
+      "type": "string",
+      "description": "Human-readable theme name",
+      "minLength": 1
+    },
+    "colorScheme": {
+      "description": "Initial color scheme this theme is designed for (default: light)",
+      "enum": ["light", "dark", "auto"]
+    },
+    "colors": { "$ref": "#/definitions/colorTokens" },
+    "colorsDark": { "$ref": "#/definitions/colorTokens" },
+    "radii": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "sm": { "$ref": "#/definitions/cssValue" },
+        "md": { "$ref": "#/definitions/cssValue" },
+        "lg": { "$ref": "#/definitions/cssValue" },
+        "full": { "$ref": "#/definitions/cssValue" },
+        "tail": { "$ref": "#/definitions/cssValue" }
+      }
+    },
+    "shadows": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "elevated": { "$ref": "#/definitions/cssValue" },
+        "floating": { "$ref": "#/definitions/cssValue" },
+        "floatingHover": { "$ref": "#/definitions/cssValue" }
+      }
+    },
+    "fonts": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "heading": { "$ref": "#/definitions/cssValue" },
+        "body": { "$ref": "#/definitions/cssValue" }
+      }
+    }
+  },
+  "definitions": {
+    "cssValue": {
+      "type": "string",
+      "minLength": 1
+    },
+    "colorTokens": {
+      "type": "object",
+      "additionalProperties": false,
+      "properties": {
+        "accent": { "$ref": "#/definitions/cssValue" },
+        "accentText": { "$ref": "#/definitions/cssValue" },
+        "accentSoft": { "$ref": "#/definitions/cssValue" },
+        "accentTextMuted": { "$ref": "#/definitions/cssValue" },
+        "surface": { "$ref": "#/definitions/cssValue" },
+        "surfaceMuted": { "$ref": "#/definitions/cssValue" },
+        "text": { "$ref": "#/definitions/cssValue" },
+        "textMuted": { "$ref": "#/definitions/cssValue" },
+        "border": { "$ref": "#/definitions/cssValue" },
+        "userBubble": { "$ref": "#/definitions/cssValue" },
+        "userBubbleText": { "$ref": "#/definitions/cssValue" },
+        "assistantBubble": { "$ref": "#/definitions/cssValue" },
+        "assistantBubbleText": { "$ref": "#/definitions/cssValue" },
+        "field": { "$ref": "#/definitions/cssValue" },
+        "error": { "$ref": "#/definitions/cssValue" },
+        "errorSurface": { "$ref": "#/definitions/cssValue" },
+        "errorText": { "$ref": "#/definitions/cssValue" },
+        "link": { "$ref": "#/definitions/cssValue" },
+        "scrim": { "$ref": "#/definitions/cssValue" }
+      }
+    }
+  }
+}
diff --git a/docs/src/content/docs/api/widget.md b/docs/src/content/docs/api/widget.md
@@ -24,7 +24,7 @@ interface ChatWidgetProps {
   persistMessages?: boolean;
   storageKeyPrefix?: string;
   requestTimeoutMs?: number;
-  theme?: "light" | "dark" | "auto";
+  theme?: ClaudiusThemeInput;
   accentColor?: string;
   position?: "bottom-right" | "bottom-left" | "top-right" | "top-left";
   locale?: "en" | "es" | "fr" | "de";
@@ -47,6 +47,30 @@ type Trigger =
 type TriggerAction = "open" | { greeting: string };
 ```
 
+### `ClaudiusThemeInput` and `ClaudiusTheme`
+
+```ts
+type ClaudiusThemeInput =
+  | "light" | "dark" | "auto"                       // color-scheme mode
+  | "default" | "minimal" | "playful" | "corporate" // built-in themes
+  | ClaudiusTheme                                   // inline tokens
+  | (string & {});                                  // URL to theme JSON
+
+interface ClaudiusTheme {
+  $schema?: string;
+  name?: string;
+  colorScheme?: "light" | "dark" | "auto";
+  colors?: Partial<Record<ThemeColorToken, string>>;
+  colorsDark?: Partial<Record<ThemeColorToken, string>>;
+  radii?: Partial<Record<"sm" | "md" | "lg" | "full" | "tail", string>>;
+  shadows?: Partial<Record<"elevated" | "floating" | "floatingHover", string>>;
+  fonts?: Partial<Record<"heading" | "body", string>>;
+}
+```
+
+The four built-ins are exported as `builtinThemes`. Token semantics and
+defaults: [theming reference](/configuration/theming/#token-reference).
+
 ### `ClaudiusTranslations`
 
 All UI strings; see the [key table](/configuration/localization/#available-keys).