themes-v1: 18 preset palettes + Settings picker

Adds 18 preset themes (16 dual-mode + 2 light-only) selectable from a new /settings route. Persists per-user via the existing key-value settings table — no schema refactor. Default on first load is obsidian dark. Storage: two new seeded keys (theme_id, theme_mode) inserted idempotently from schema.sql. PATCH /api/settings tightens validation with a discriminated branch — theme_id must be one of the 18 whitelisted ids, theme_mode ∈ {dark,light,system}, anything else rejects 400. Other keys pass through the loose record schema. CSS layer: 18 files in apps/web/src/styles/themes/, each declaring .theme-<id> (light) and .theme-<id>.dark (dark) — except ivory and chalk which are light-only. Anchor-to-token mapping per spec §3. --destructive stays red across all themes. --radius unchanged at 0.625rem (spec parenthetical was about "not per-theme", not a specific value swap). Frontend: lib/theme.ts owns THEMES, applyTheme(), setTheme(), and useTheme() — module-singleton with optimistic PATCH + revert on failure (mirrors useChatStatus / useSidebar pattern). Settings.tsx renders a 3-col (md) / 2-col (mobile) grid of shadcn Card swatches with a Dark/Light/System radio group on top. App.tsx mounts useTheme() at AppShell top and wires the /settings route. index.html ships a pre-React FOUC script that reads localStorage 'boocode.theme' and stamps the className on <html> before any paint. Stripped two pre-existing dark-mode lock-ins (AppShell's hardcoded 'dark' className and body's neutral-950/100 tailwind utilities) that would have fought theme tokens. Light-only + dark request → falls back to obsidian dark in three places: lib/theme.ts effectiveThemeId(), the FOUC script, and the picker's "Light only" badge. No inline message; matches spec §8 decision 1. shadcn primitives card and radio-group installed via shadcn CLI (no hand-rolling). card.tsx and radio-group.tsx are the only ui/ additions. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-17 16:25:15 +00:00
parent efbecd074a
commit 9b174cdb5e
28 changed files with 1895 additions and 2 deletions
--- a/apps/web/src/App.tsx
+++ b/apps/web/src/App.tsx
@@ -6,8 +6,10 @@ import { RightRail } from '@/components/RightRail';
 import { Home } from '@/pages/Home';
 import { Project } from '@/pages/Project';
 import { Session } from '@/pages/Session';
+import { Settings } from '@/pages/Settings';
 import { Toaster } from '@/components/ui/sonner';
 import { useUserEvents } from '@/hooks/useUserEvents';
+import { useTheme } from '@/lib/theme';
 import { SidebarDrawerProvider, useSidebarDrawer } from '@/hooks/useSidebarDrawer';
 import { RightRailDrawerProvider, useRightRailDrawer } from '@/hooks/useRightRailDrawer';
 import { useViewport } from '@/hooks/useViewport';
@@ -61,9 +63,13 @@ function MobileRightRailBackdrop() {
 }

 function AppShell() {
+  // themes-v1: useTheme() owns the matchMedia subscription for system mode
+  // and reconciles cache with /api/settings on mount. Mounted first so the
+  // theme class on <html> is correct before any child renders.
+  useTheme();
  useUserEvents();
  return (
-    <div className="dark h-screen flex bg-background text-foreground">
+    <div className="h-screen flex bg-background text-foreground">
      <ProjectSidebar />
      <MobileBackdrop />
      <main className="flex-1 flex flex-col min-w-0">
@@ -71,6 +77,7 @@ function AppShell() {
          <Route path="/" element={<Home />} />
          <Route path="/project/:id" element={<Project />} />
          <Route path="/session/:id" element={<Session />} />
+          <Route path="/settings" element={<Settings />} />
        </Routes>
      </main>
      <MobileRightRailBackdrop />
--- a/apps/web/src/components/ui/card.tsx
+++ b/apps/web/src/components/ui/card.tsx
@@ -0,0 +1,103 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+function Card({
+  className,
+  size = "default",
+  ...props
+}: React.ComponentProps<"div"> & { size?: "default" | "sm" }) {
+  return (
+    <div
+      data-slot="card"
+      data-size={size}
+      className={cn(
+        "group/card flex flex-col gap-4 overflow-hidden rounded-xl bg-card py-4 text-sm text-card-foreground ring-1 ring-foreground/10 has-data-[slot=card-footer]:pb-0 has-[>img:first-child]:pt-0 data-[size=sm]:gap-3 data-[size=sm]:py-3 data-[size=sm]:has-data-[slot=card-footer]:pb-0 *:[img:first-child]:rounded-t-xl *:[img:last-child]:rounded-b-xl",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-header"
+      className={cn(
+        "group/card-header @container/card-header grid auto-rows-min items-start gap-1 rounded-t-xl px-4 group-data-[size=sm]/card:px-3 has-data-[slot=card-action]:grid-cols-[1fr_auto] has-data-[slot=card-description]:grid-rows-[auto_auto] [.border-b]:pb-4 group-data-[size=sm]/card:[.border-b]:pb-3",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-title"
+      className={cn(
+        "text-base leading-snug font-medium group-data-[size=sm]/card:text-sm",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardDescription({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-description"
+      className={cn("text-sm text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+function CardAction({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-action"
+      className={cn(
+        "col-start-2 row-span-2 row-start-1 self-start justify-self-end",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardContent({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-content"
+      className={cn("px-4 group-data-[size=sm]/card:px-3", className)}
+      {...props}
+    />
+  )
+}
+
+function CardFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-footer"
+      className={cn(
+        "flex items-center rounded-b-xl border-t bg-muted/50 p-4 group-data-[size=sm]/card:p-3",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+export {
+  Card,
+  CardHeader,
+  CardFooter,
+  CardTitle,
+  CardAction,
+  CardDescription,
+  CardContent,
+}
--- a/apps/web/src/components/ui/radio-group.tsx
+++ b/apps/web/src/components/ui/radio-group.tsx
@@ -0,0 +1,42 @@
+import * as React from "react"
+import { RadioGroup as RadioGroupPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function RadioGroup({
+  className,
+  ...props
+}: React.ComponentProps<typeof RadioGroupPrimitive.Root>) {
+  return (
+    <RadioGroupPrimitive.Root
+      data-slot="radio-group"
+      className={cn("grid w-full gap-2", className)}
+      {...props}
+    />
+  )
+}
+
+function RadioGroupItem({
+  className,
+  ...props
+}: React.ComponentProps<typeof RadioGroupPrimitive.Item>) {
+  return (
+    <RadioGroupPrimitive.Item
+      data-slot="radio-group-item"
+      className={cn(
+        "group/radio-group-item peer relative flex aspect-square size-4 shrink-0 rounded-full border border-input outline-none after:absolute after:-inset-x-3 after:-inset-y-2 focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 disabled:cursor-not-allowed disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-3 aria-invalid:ring-destructive/20 aria-invalid:aria-checked:border-primary dark:bg-input/30 dark:aria-invalid:border-destructive/50 dark:aria-invalid:ring-destructive/40 data-checked:border-primary data-checked:bg-primary data-checked:text-primary-foreground dark:data-checked:bg-primary",
+        className
+      )}
+      {...props}
+    >
+      <RadioGroupPrimitive.Indicator
+        data-slot="radio-group-indicator"
+        className="flex size-4 items-center justify-center"
+      >
+        <span className="absolute top-1/2 left-1/2 size-2 -translate-x-1/2 -translate-y-1/2 rounded-full bg-primary-foreground" />
+      </RadioGroupPrimitive.Indicator>
+    </RadioGroupPrimitive.Item>
+  )
+}
+
+export { RadioGroup, RadioGroupItem }
--- a/apps/web/src/lib/theme.ts
+++ b/apps/web/src/lib/theme.ts
@@ -0,0 +1,226 @@
+import { useEffect, useState } from 'react';
+import { api } from '@/api/client';
+
+// themes-v1: source of truth for the 18 presets. id and name are surfaced in
+// the picker; family groups visually; supportsDark/supportsLight reflect
+// whether the corresponding selector exists in styles/themes/<id>.css; anchors
+// are the 5 dark swatches (or the light palette for the two light-only themes)
+// used in the picker preview strip.
+export type ThemeId =
+  | 'obsidian'
+  | 'gunmetal'
+  | 'espresso'
+  | 'volcanic-brown'
+  | 'copper'
+  | 'gold'
+  | 'oxblood'
+  | 'crimson'
+  | 'elderflower'
+  | 'plum'
+  | 'steel-pink'
+  | 'fuchsia-noir'
+  | 'matrix'
+  | 'sage'
+  | 'ivory'
+  | 'chalk'
+  | 'cobalt'
+  | 'midnight-sapphire';
+
+export type ThemeMode = 'dark' | 'light' | 'system';
+
+export interface ThemeMeta {
+  id: ThemeId;
+  name: string;
+  family: string;
+  supportsDark: boolean;
+  supportsLight: boolean;
+  anchors: [string, string, string, string, string];
+}
+
+export const THEMES: readonly ThemeMeta[] = [
+  { id: 'obsidian', name: 'Obsidian', family: 'Charcoal', supportsDark: true, supportsLight: true,
+    anchors: ['#0c0c0e', '#15151a', '#1f1f23', '#6b6b75', '#8b5cf6'] },
+  { id: 'gunmetal', name: 'Gunmetal', family: 'Charcoal', supportsDark: true, supportsLight: true,
+    anchors: ['#0d1117', '#161b22', '#21262d', '#7d8590', '#388bfd'] },
+  { id: 'espresso', name: 'Espresso', family: 'Brown', supportsDark: true, supportsLight: true,
+    anchors: ['#1c1410', '#241a14', '#2e2218', '#8a7058', '#c8a880'] },
+  { id: 'volcanic-brown', name: 'Volcanic Brown', family: 'Brown', supportsDark: true, supportsLight: true,
+    anchors: ['#140906', '#1e0e0a', '#2e1610', '#7a4030', '#cc4a1a'] },
+  { id: 'copper', name: 'Copper', family: 'Amber', supportsDark: true, supportsLight: true,
+    anchors: ['#100800', '#1c1408', '#2e1f0a', '#8a6040', '#b87333'] },
+  { id: 'gold', name: 'Gold', family: 'Amber', supportsDark: true, supportsLight: true,
+    anchors: ['#0e0800', '#1a1200', '#2a1f00', '#a07c30', '#d4af37'] },
+  { id: 'oxblood', name: 'Oxblood', family: 'Crimson', supportsDark: true, supportsLight: true,
+    anchors: ['#0a0303', '#180606', '#2a0808', '#7a3028', '#8b1a1a'] },
+  { id: 'crimson', name: 'Crimson', family: 'Crimson', supportsDark: true, supportsLight: true,
+    anchors: ['#0e0404', '#1a0808', '#2e0a0a', '#8a3030', '#dc143c'] },
+  { id: 'elderflower', name: 'Elderflower', family: 'Violet', supportsDark: true, supportsLight: true,
+    anchors: ['#100818', '#1c1024', '#2c1830', '#8a78a0', '#b89cd8'] },
+  { id: 'plum', name: 'Plum', family: 'Violet', supportsDark: true, supportsLight: true,
+    anchors: ['#0c0814', '#180e20', '#241830', '#7a4878', '#8e4585'] },
+  { id: 'steel-pink', name: 'Steel Pink', family: 'Magenta', supportsDark: true, supportsLight: true,
+    anchors: ['#0e0408', '#1a080e', '#2e0c1a', '#9a4070', '#cc33aa'] },
+  { id: 'fuchsia-noir', name: 'Fuchsia Noir', family: 'Magenta', supportsDark: true, supportsLight: true,
+    anchors: ['#0a0610', '#14081a', '#2a0c2e', '#8a3878', '#ff1493'] },
+  { id: 'matrix', name: 'Matrix', family: 'Green', supportsDark: true, supportsLight: true,
+    anchors: ['#000a00', '#031403', '#0a200a', '#208030', '#00ff41'] },
+  { id: 'sage', name: 'Sage', family: 'Green', supportsDark: true, supportsLight: true,
+    anchors: ['#0a0e08', '#141a10', '#1e2e1a', '#7a8870', '#9caf88'] },
+  { id: 'ivory', name: 'Ivory', family: 'Light', supportsDark: false, supportsLight: true,
+    anchors: ['#fdfcf8', '#f5f2e8', '#e8e4d8', '#8a8478', '#3a3328'] },
+  { id: 'chalk', name: 'Chalk', family: 'Light', supportsDark: false, supportsLight: true,
+    anchors: ['#fafaf7', '#f0f0ec', '#e5e5e0', '#75756e', '#2a2a28'] },
+  { id: 'cobalt', name: 'Cobalt', family: 'Blue', supportsDark: true, supportsLight: true,
+    anchors: ['#020817', '#061434', '#0c2244', '#3060a0', '#0047ab'] },
+  { id: 'midnight-sapphire', name: 'Midnight Sapphire', family: 'Blue', supportsDark: true, supportsLight: true,
+    anchors: ['#02050e', '#060c1f', '#0e1a36', '#4a6088', '#1e3a8a'] },
+] as const;
+
+export const DEFAULT_THEME_ID: ThemeId = 'obsidian';
+export const DEFAULT_THEME_MODE: ThemeMode = 'dark';
+export const STORAGE_KEY = 'boocode.theme';
+
+const THEME_IDS_SET: ReadonlySet<string> = new Set(THEMES.map((t) => t.id));
+
+export function isThemeId(s: string): s is ThemeId {
+  return THEME_IDS_SET.has(s);
+}
+
+function resolvedMode(mode: ThemeMode): 'dark' | 'light' {
+  if (mode !== 'system') return mode;
+  if (typeof window === 'undefined') return 'dark';
+  return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+}
+
+// Light-only themes (ivory, chalk) can't render dark — fall back to obsidian
+// dark per spec §8 decision 1. Keeps the fallback explicit so the caller
+// doesn't accidentally apply theme-ivory.dark (which has no rule block).
+function effectiveThemeId(id: ThemeId, mode: 'dark' | 'light'): ThemeId {
+  if (mode === 'dark') {
+    const meta = THEMES.find((t) => t.id === id);
+    if (meta && !meta.supportsDark) return DEFAULT_THEME_ID;
+  }
+  return id;
+}
+
+export function applyTheme(id: ThemeId, mode: ThemeMode): void {
+  if (typeof document === 'undefined') return;
+  const resolved = resolvedMode(mode);
+  const effective = effectiveThemeId(id, resolved);
+  document.documentElement.className =
+    `theme-${effective}${resolved === 'dark' ? ' dark' : ''}`;
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify({ id, mode }));
+  } catch {
+    // quota / disabled storage — apply still succeeds, persistence falls
+    // back to the next /api/settings round-trip.
+  }
+}
+
+interface ThemeState {
+  id: ThemeId;
+  mode: ThemeMode;
+}
+
+// Module-level singleton, mirrors the useChatStatus / useSidebar pattern.
+// One shared state across every useTheme() consumer; setTheme() mutates it
+// and notifies subscribers so the App-level hook (which owns the matchMedia
+// listener) and the Settings picker stay in lockstep without prop drilling.
+function readCache(): ThemeState | null {
+  if (typeof localStorage === 'undefined') return null;
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw) as { id?: unknown; mode?: unknown };
+    if (typeof parsed.id !== 'string' || !isThemeId(parsed.id)) return null;
+    const m = parsed.mode;
+    if (m !== 'dark' && m !== 'light' && m !== 'system') return null;
+    return { id: parsed.id, mode: m };
+  } catch {
+    return null;
+  }
+}
+
+let _state: ThemeState = readCache() ?? { id: DEFAULT_THEME_ID, mode: DEFAULT_THEME_MODE };
+let _initialized = false;
+const _subscribers = new Set<(s: ThemeState) => void>();
+
+function notify(): void {
+  for (const sub of _subscribers) {
+    try {
+      sub(_state);
+    } catch {
+      // swallow — one bad subscriber shouldn't break others
+    }
+  }
+}
+
+// Optimistic update: applies immediately, PATCHes server, reverts on failure
+// so the picker can show a toast without manual state juggling. Throws on
+// failure so the caller can surface the error.
+export async function setTheme(id: ThemeId, mode: ThemeMode): Promise<void> {
+  const prev = _state;
+  _state = { id, mode };
+  applyTheme(id, mode);
+  notify();
+  try {
+    await api.settings.patch({ theme_id: id, theme_mode: mode });
+  } catch (err) {
+    _state = prev;
+    applyTheme(prev.id, prev.mode);
+    notify();
+    throw err;
+  }
+}
+
+// useTheme — mounts as many times as needed across the tree. The first mount
+// (initialized=false) triggers a single /api/settings fetch to reconcile the
+// local cache with the server. Every mount installs the matchMedia listener
+// when mode === 'system'; cleanup runs on unmount or when mode flips away.
+export function useTheme(): ThemeState {
+  const [state, setState] = useState<ThemeState>(_state);
+
+  useEffect(() => {
+    _subscribers.add(setState);
+    // Ensure the DOM reflects current state on mount — the FOUC script in
+    // index.html runs before this hook, but we re-apply in case the cache
+    // was stale relative to a fresh fetch above.
+    applyTheme(_state.id, _state.mode);
+    if (!_initialized) {
+      _initialized = true;
+      api.settings
+        .get()
+        .then((s) => {
+          const rawId = s['theme_id'];
+          const rawMode = s['theme_mode'];
+          const id =
+            typeof rawId === 'string' && isThemeId(rawId) ? rawId : DEFAULT_THEME_ID;
+          const mode: ThemeMode =
+            rawMode === 'dark' || rawMode === 'light' || rawMode === 'system'
+              ? rawMode
+              : DEFAULT_THEME_MODE;
+          _state = { id, mode };
+          applyTheme(id, mode);
+          notify();
+        })
+        .catch(() => {
+          // Settings fetch failed — keep whatever the FOUC script applied.
+          // The picker still works; PATCH will retry on next selection.
+        });
+    }
+    return () => {
+      _subscribers.delete(setState);
+    };
+  }, []);
+
+  useEffect(() => {
+    if (state.mode !== 'system') return;
+    if (typeof window === 'undefined') return;
+    const mql = window.matchMedia('(prefers-color-scheme: dark)');
+    const onChange = () => applyTheme(state.id, 'system');
+    mql.addEventListener('change', onChange);
+    return () => mql.removeEventListener('change', onChange);
+  }, [state.id, state.mode]);
+
+  return state;
+}
--- a/apps/web/src/pages/Settings.tsx
+++ b/apps/web/src/pages/Settings.tsx
@@ -0,0 +1,125 @@
+import { useState } from 'react';
+import { Check } from 'lucide-react';
+import { toast } from 'sonner';
+import { Card } from '@/components/ui/card';
+import { Label } from '@/components/ui/label';
+import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group';
+import { THEMES, setTheme, useTheme, type ThemeId, type ThemeMode } from '@/lib/theme';
+import { cn } from '@/lib/utils';
+
+const MODES: { value: ThemeMode; label: string; hint: string }[] = [
+  { value: 'dark', label: 'Dark', hint: 'Use the dark variant.' },
+  { value: 'light', label: 'Light', hint: 'Use the light variant.' },
+  { value: 'system', label: 'System', hint: 'Follow OS preference.' },
+];
+
+export function Settings() {
+  const { id: currentId, mode: currentMode } = useTheme();
+  // Track the most recent in-flight pick so the picker can show a subtle
+  // "applying…" state on the targeted card while the PATCH is in flight.
+  const [pending, setPending] = useState<{ kind: 'theme'; id: ThemeId } | { kind: 'mode'; mode: ThemeMode } | null>(null);
+
+  async function pickTheme(id: ThemeId) {
+    if (id === currentId || pending) return;
+    setPending({ kind: 'theme', id });
+    try {
+      await setTheme(id, currentMode);
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : 'failed to apply theme');
+    } finally {
+      setPending(null);
+    }
+  }
+
+  async function pickMode(mode: ThemeMode) {
+    if (mode === currentMode || pending) return;
+    setPending({ kind: 'mode', mode });
+    try {
+      await setTheme(currentId, mode);
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : 'failed to apply mode');
+    } finally {
+      setPending(null);
+    }
+  }
+
+  return (
+    <div className="flex-1 overflow-y-auto">
+      <div className="max-w-[1000px] mx-auto w-full px-6 py-6 space-y-8">
+        <header>
+          <h1 className="text-xl font-semibold">Settings</h1>
+          <p className="text-sm text-muted-foreground mt-1">
+            Theme appearance. Saved on change, applies immediately.
+          </p>
+        </header>
+
+        <section className="space-y-3">
+          <h2 className="text-sm font-medium">Mode</h2>
+          <RadioGroup
+            value={currentMode}
+            onValueChange={(v) => void pickMode(v as ThemeMode)}
+            className="flex flex-wrap gap-4"
+          >
+            {MODES.map((m) => (
+              <div key={m.value} className="flex items-center gap-2">
+                <RadioGroupItem id={`mode-${m.value}`} value={m.value} />
+                <Label htmlFor={`mode-${m.value}`} className="cursor-pointer">
+                  <span className="font-medium">{m.label}</span>
+                  <span className="ml-2 text-xs text-muted-foreground">{m.hint}</span>
+                </Label>
+              </div>
+            ))}
+          </RadioGroup>
+        </section>
+
+        <section className="space-y-3">
+          <h2 className="text-sm font-medium">Theme</h2>
+          <div className="grid grid-cols-2 md:grid-cols-3 gap-3">
+            {THEMES.map((t) => {
+              const isActive = t.id === currentId;
+              const isPending = pending?.kind === 'theme' && pending.id === t.id;
+              const isLightOnly = !t.supportsDark;
+              return (
+                <Card
+                  key={t.id}
+                  onClick={() => void pickTheme(t.id)}
+                  className={cn(
+                    'p-3 cursor-pointer transition-colors',
+                    'hover:bg-accent/10',
+                    isActive && 'ring-2 ring-ring',
+                    isPending && 'opacity-60',
+                  )}
+                >
+                  <div className="flex items-center justify-between gap-2">
+                    <div className="min-w-0">
+                      <div className="font-mono text-sm truncate">{t.name}</div>
+                      <div className="text-xs text-muted-foreground">{t.family}</div>
+                    </div>
+                    {isActive && (
+                      <span className="inline-flex items-center gap-1 text-xs text-primary shrink-0">
+                        <Check className="size-3" /> Selected
+                      </span>
+                    )}
+                  </div>
+                  <div className="flex mt-2 rounded overflow-hidden border border-border/40">
+                    {t.anchors.map((hex, i) => (
+                      <div
+                        key={i}
+                        className="flex-1 h-6"
+                        style={{ backgroundColor: hex }}
+                        aria-hidden="true"
+                      />
+                    ))}
+                  </div>
+                  {isLightOnly && (
+                    <div className="mt-2 text-xs text-muted-foreground italic">Light only</div>
+                  )}
+                </Card>
+              );
+            })}
+          </div>
+        </section>
+      </div>
+    </div>
+  );
+}
--- a/apps/web/src/styles/globals.css
+++ b/apps/web/src/styles/globals.css
@@ -4,6 +4,29 @@
@import "@fontsource-variable/inter";
@import "@fontsource-variable/jetbrains-mono";

+/* themes-v1: 18 preset palettes. Order matches docs/themes_v1.md §1 with
+   obsidian first (default). Each file declares .theme-<id> for the light
+   variant and .theme-<id>.dark for the dark variant (except ivory/chalk
+   which are light-only). lib/theme.ts owns the class composition on <html>. */
+@import "./themes/obsidian.css";
+@import "./themes/gunmetal.css";
+@import "./themes/espresso.css";
+@import "./themes/volcanic-brown.css";
+@import "./themes/copper.css";
+@import "./themes/gold.css";
+@import "./themes/oxblood.css";
+@import "./themes/crimson.css";
+@import "./themes/elderflower.css";
+@import "./themes/plum.css";
+@import "./themes/steel-pink.css";
+@import "./themes/fuchsia-noir.css";
+@import "./themes/matrix.css";
+@import "./themes/sage.css";
+@import "./themes/ivory.css";
+@import "./themes/chalk.css";
+@import "./themes/cobalt.css";
+@import "./themes/midnight-sapphire.css";
+
@custom-variant dark (&:is(.dark *));

 :root {
--- a/apps/web/src/styles/themes/chalk.css
+++ b/apps/web/src/styles/themes/chalk.css
@@ -0,0 +1,33 @@
+/* themes-v1: Chalk (family: light-only).
+   Anchors used directly as light palette: #fafaf7 #f0f0ec #e5e5e0 #75756e #2a2a28.
+   No .theme-chalk.dark — selecting dark mode on chalk falls back to obsidian
+   dark via lib/theme.ts. */
+.theme-chalk {
+  --background: #fafaf7;
+  --foreground: #2a2a28;
+  --card: #f0f0ec;
+  --card-foreground: #2a2a28;
+  --popover: #f0f0ec;
+  --popover-foreground: #2a2a28;
+  --primary: #2a2a28;
+  --primary-foreground: #fafaf7;
+  --secondary: #e5e5e0;
+  --secondary-foreground: #2a2a28;
+  --muted: #e5e5e0;
+  --muted-foreground: #75756e;
+  --accent: #2a2a28;
+  --accent-foreground: #fafaf7;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e5e5e0;
+  --input: #e5e5e0;
+  --ring: #2a2a28;
+  --sidebar: #f0f0ec;
+  --sidebar-foreground: #2a2a28;
+  --sidebar-primary: #2a2a28;
+  --sidebar-primary-foreground: #fafaf7;
+  --sidebar-accent: #e5e5e0;
+  --sidebar-accent-foreground: #2a2a28;
+  --sidebar-border: #e5e5e0;
+  --sidebar-ring: #2a2a28;
+}
--- a/apps/web/src/styles/themes/cobalt.css
+++ b/apps/web/src/styles/themes/cobalt.css
@@ -0,0 +1,60 @@
+/* themes-v1: Cobalt (family: blue).
+   Dark anchors: #020817 #061434 #0c2244 #3060a0 #0047ab. */
+.theme-cobalt {
+  --background: #f4f8ff;
+  --foreground: #0a1428;
+  --card: #e8f0fc;
+  --card-foreground: #0a1428;
+  --popover: #e8f0fc;
+  --popover-foreground: #0a1428;
+  --primary: #003278;
+  --primary-foreground: #ffffff;
+  --secondary: #d4e0f4;
+  --secondary-foreground: #0a1428;
+  --muted: #d4e0f4;
+  --muted-foreground: #284878;
+  --accent: #003278;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #d4e0f4;
+  --input: #d4e0f4;
+  --ring: #003278;
+  --sidebar: #e8f0fc;
+  --sidebar-foreground: #0a1428;
+  --sidebar-primary: #003278;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #d4e0f4;
+  --sidebar-accent-foreground: #0a1428;
+  --sidebar-border: #d4e0f4;
+  --sidebar-ring: #003278;
+}
+.theme-cobalt.dark {
+  --background: #020817;
+  --foreground: #dce4f0;
+  --card: #061434;
+  --card-foreground: #dce4f0;
+  --popover: #061434;
+  --popover-foreground: #dce4f0;
+  --primary: #0047ab;
+  --primary-foreground: #dce4f0;
+  --secondary: #0c2244;
+  --secondary-foreground: #dce4f0;
+  --muted: #0c2244;
+  --muted-foreground: #3060a0;
+  --accent: #0047ab;
+  --accent-foreground: #dce4f0;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #0c2244;
+  --input: #0c2244;
+  --ring: #0047ab;
+  --sidebar: #061434;
+  --sidebar-foreground: #dce4f0;
+  --sidebar-primary: #0047ab;
+  --sidebar-primary-foreground: #dce4f0;
+  --sidebar-accent: #0047ab;
+  --sidebar-accent-foreground: #dce4f0;
+  --sidebar-border: #0c2244;
+  --sidebar-ring: #0047ab;
+}
--- a/apps/web/src/styles/themes/copper.css
+++ b/apps/web/src/styles/themes/copper.css
@@ -0,0 +1,60 @@
+/* themes-v1: Copper (family: orange/amber).
+   Dark anchors: #100800 #1c1408 #2e1f0a #8a6040 #b87333. */
+.theme-copper {
+  --background: #fdf8f0;
+  --foreground: #2a1f0a;
+  --card: #faf0e0;
+  --card-foreground: #2a1f0a;
+  --popover: #faf0e0;
+  --popover-foreground: #2a1f0a;
+  --primary: #8a5424;
+  --primary-foreground: #ffffff;
+  --secondary: #f0e0c0;
+  --secondary-foreground: #2a1f0a;
+  --muted: #f0e0c0;
+  --muted-foreground: #6e4828;
+  --accent: #8a5424;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #f0e0c0;
+  --input: #f0e0c0;
+  --ring: #8a5424;
+  --sidebar: #faf0e0;
+  --sidebar-foreground: #2a1f0a;
+  --sidebar-primary: #8a5424;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #f0e0c0;
+  --sidebar-accent-foreground: #2a1f0a;
+  --sidebar-border: #f0e0c0;
+  --sidebar-ring: #8a5424;
+}
+.theme-copper.dark {
+  --background: #100800;
+  --foreground: #f8e8c8;
+  --card: #1c1408;
+  --card-foreground: #f8e8c8;
+  --popover: #1c1408;
+  --popover-foreground: #f8e8c8;
+  --primary: #b87333;
+  --primary-foreground: #100800;
+  --secondary: #2e1f0a;
+  --secondary-foreground: #f8e8c8;
+  --muted: #2e1f0a;
+  --muted-foreground: #8a6040;
+  --accent: #b87333;
+  --accent-foreground: #100800;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2e1f0a;
+  --input: #2e1f0a;
+  --ring: #b87333;
+  --sidebar: #1c1408;
+  --sidebar-foreground: #f8e8c8;
+  --sidebar-primary: #b87333;
+  --sidebar-primary-foreground: #100800;
+  --sidebar-accent: #b87333;
+  --sidebar-accent-foreground: #100800;
+  --sidebar-border: #2e1f0a;
+  --sidebar-ring: #b87333;
+}
--- a/apps/web/src/styles/themes/crimson.css
+++ b/apps/web/src/styles/themes/crimson.css
@@ -0,0 +1,60 @@
+/* themes-v1: Crimson (family: red/crimson).
+   Dark anchors: #0e0404 #1a0808 #2e0a0a #8a3030 #dc143c. */
+.theme-crimson {
+  --background: #fef4f6;
+  --foreground: #2a0a12;
+  --card: #fde6ea;
+  --card-foreground: #2a0a12;
+  --popover: #fde6ea;
+  --popover-foreground: #2a0a12;
+  --primary: #a40e2d;
+  --primary-foreground: #ffffff;
+  --secondary: #f4d0d8;
+  --secondary-foreground: #2a0a12;
+  --muted: #f4d0d8;
+  --muted-foreground: #6a2030;
+  --accent: #a40e2d;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #f4d0d8;
+  --input: #f4d0d8;
+  --ring: #a40e2d;
+  --sidebar: #fde6ea;
+  --sidebar-foreground: #2a0a12;
+  --sidebar-primary: #a40e2d;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #f4d0d8;
+  --sidebar-accent-foreground: #2a0a12;
+  --sidebar-border: #f4d0d8;
+  --sidebar-ring: #a40e2d;
+}
+.theme-crimson.dark {
+  --background: #0e0404;
+  --foreground: #f0d4d8;
+  --card: #1a0808;
+  --card-foreground: #f0d4d8;
+  --popover: #1a0808;
+  --popover-foreground: #f0d4d8;
+  --primary: #dc143c;
+  --primary-foreground: #0e0404;
+  --secondary: #2e0a0a;
+  --secondary-foreground: #f0d4d8;
+  --muted: #2e0a0a;
+  --muted-foreground: #8a3030;
+  --accent: #dc143c;
+  --accent-foreground: #0e0404;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2e0a0a;
+  --input: #2e0a0a;
+  --ring: #dc143c;
+  --sidebar: #1a0808;
+  --sidebar-foreground: #f0d4d8;
+  --sidebar-primary: #dc143c;
+  --sidebar-primary-foreground: #0e0404;
+  --sidebar-accent: #dc143c;
+  --sidebar-accent-foreground: #0e0404;
+  --sidebar-border: #2e0a0a;
+  --sidebar-ring: #dc143c;
+}
--- a/apps/web/src/styles/themes/elderflower.css
+++ b/apps/web/src/styles/themes/elderflower.css
@@ -0,0 +1,60 @@
+/* themes-v1: Elderflower (family: purple/violet).
+   Dark anchors: #100818 #1c1024 #2c1830 #8a78a0 #b89cd8. */
+.theme-elderflower {
+  --background: #faf8fd;
+  --foreground: #1f1428;
+  --card: #f4eef9;
+  --card-foreground: #1f1428;
+  --popover: #f4eef9;
+  --popover-foreground: #1f1428;
+  --primary: #8a70b4;
+  --primary-foreground: #ffffff;
+  --secondary: #e8def0;
+  --secondary-foreground: #1f1428;
+  --muted: #e8def0;
+  --muted-foreground: #6e5a82;
+  --accent: #8a70b4;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e8def0;
+  --input: #e8def0;
+  --ring: #8a70b4;
+  --sidebar: #f4eef9;
+  --sidebar-foreground: #1f1428;
+  --sidebar-primary: #8a70b4;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #e8def0;
+  --sidebar-accent-foreground: #1f1428;
+  --sidebar-border: #e8def0;
+  --sidebar-ring: #8a70b4;
+}
+.theme-elderflower.dark {
+  --background: #100818;
+  --foreground: #ece4f0;
+  --card: #1c1024;
+  --card-foreground: #ece4f0;
+  --popover: #1c1024;
+  --popover-foreground: #ece4f0;
+  --primary: #b89cd8;
+  --primary-foreground: #100818;
+  --secondary: #2c1830;
+  --secondary-foreground: #ece4f0;
+  --muted: #2c1830;
+  --muted-foreground: #8a78a0;
+  --accent: #b89cd8;
+  --accent-foreground: #100818;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2c1830;
+  --input: #2c1830;
+  --ring: #b89cd8;
+  --sidebar: #1c1024;
+  --sidebar-foreground: #ece4f0;
+  --sidebar-primary: #b89cd8;
+  --sidebar-primary-foreground: #100818;
+  --sidebar-accent: #b89cd8;
+  --sidebar-accent-foreground: #100818;
+  --sidebar-border: #2c1830;
+  --sidebar-ring: #b89cd8;
+}
--- a/apps/web/src/styles/themes/espresso.css
+++ b/apps/web/src/styles/themes/espresso.css
@@ -0,0 +1,60 @@
+/* themes-v1: Espresso (family: brown/earth).
+   Dark anchors: #1c1410 #241a14 #2e2218 #8a7058 #c8a880. */
+.theme-espresso {
+  --background: #faf6f0;
+  --foreground: #2a1f15;
+  --card: #f3ece0;
+  --card-foreground: #2a1f15;
+  --popover: #f3ece0;
+  --popover-foreground: #2a1f15;
+  --primary: #9c7948;
+  --primary-foreground: #ffffff;
+  --secondary: #e6dccc;
+  --secondary-foreground: #2a1f15;
+  --muted: #e6dccc;
+  --muted-foreground: #6e5944;
+  --accent: #9c7948;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e6dccc;
+  --input: #e6dccc;
+  --ring: #9c7948;
+  --sidebar: #f3ece0;
+  --sidebar-foreground: #2a1f15;
+  --sidebar-primary: #9c7948;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #e6dccc;
+  --sidebar-accent-foreground: #2a1f15;
+  --sidebar-border: #e6dccc;
+  --sidebar-ring: #9c7948;
+}
+.theme-espresso.dark {
+  --background: #1c1410;
+  --foreground: #f0e8d8;
+  --card: #241a14;
+  --card-foreground: #f0e8d8;
+  --popover: #241a14;
+  --popover-foreground: #f0e8d8;
+  --primary: #c8a880;
+  --primary-foreground: #1c1410;
+  --secondary: #2e2218;
+  --secondary-foreground: #f0e8d8;
+  --muted: #2e2218;
+  --muted-foreground: #8a7058;
+  --accent: #c8a880;
+  --accent-foreground: #1c1410;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2e2218;
+  --input: #2e2218;
+  --ring: #c8a880;
+  --sidebar: #241a14;
+  --sidebar-foreground: #f0e8d8;
+  --sidebar-primary: #c8a880;
+  --sidebar-primary-foreground: #1c1410;
+  --sidebar-accent: #c8a880;
+  --sidebar-accent-foreground: #1c1410;
+  --sidebar-border: #2e2218;
+  --sidebar-ring: #c8a880;
+}
--- a/apps/web/src/styles/themes/fuchsia-noir.css
+++ b/apps/web/src/styles/themes/fuchsia-noir.css
@@ -0,0 +1,60 @@
+/* themes-v1: Fuchsia Noir (family: pink/magenta).
+   Dark anchors: #0a0610 #14081a #2a0c2e #8a3878 #ff1493. */
+.theme-fuchsia-noir {
+  --background: #fdf4f8;
+  --foreground: #2a0a1c;
+  --card: #fbe6f0;
+  --card-foreground: #2a0a1c;
+  --popover: #fbe6f0;
+  --popover-foreground: #2a0a1c;
+  --primary: #c20070;
+  --primary-foreground: #ffffff;
+  --secondary: #f4d0e4;
+  --secondary-foreground: #2a0a1c;
+  --muted: #f4d0e4;
+  --muted-foreground: #7a2860;
+  --accent: #c20070;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #f4d0e4;
+  --input: #f4d0e4;
+  --ring: #c20070;
+  --sidebar: #fbe6f0;
+  --sidebar-foreground: #2a0a1c;
+  --sidebar-primary: #c20070;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #f4d0e4;
+  --sidebar-accent-foreground: #2a0a1c;
+  --sidebar-border: #f4d0e4;
+  --sidebar-ring: #c20070;
+}
+.theme-fuchsia-noir.dark {
+  --background: #0a0610;
+  --foreground: #f0d8e8;
+  --card: #14081a;
+  --card-foreground: #f0d8e8;
+  --popover: #14081a;
+  --popover-foreground: #f0d8e8;
+  --primary: #ff1493;
+  --primary-foreground: #0a0610;
+  --secondary: #2a0c2e;
+  --secondary-foreground: #f0d8e8;
+  --muted: #2a0c2e;
+  --muted-foreground: #8a3878;
+  --accent: #ff1493;
+  --accent-foreground: #0a0610;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2a0c2e;
+  --input: #2a0c2e;
+  --ring: #ff1493;
+  --sidebar: #14081a;
+  --sidebar-foreground: #f0d8e8;
+  --sidebar-primary: #ff1493;
+  --sidebar-primary-foreground: #0a0610;
+  --sidebar-accent: #ff1493;
+  --sidebar-accent-foreground: #0a0610;
+  --sidebar-border: #2a0c2e;
+  --sidebar-ring: #ff1493;
+}
--- a/apps/web/src/styles/themes/gold.css
+++ b/apps/web/src/styles/themes/gold.css
@@ -0,0 +1,60 @@
+/* themes-v1: Gold (family: orange/amber).
+   Dark anchors: #0e0800 #1a1200 #2a1f00 #a07c30 #d4af37. */
+.theme-gold {
+  --background: #fffbf0;
+  --foreground: #2a200a;
+  --card: #fdf3d0;
+  --card-foreground: #2a200a;
+  --popover: #fdf3d0;
+  --popover-foreground: #2a200a;
+  --primary: #a18229;
+  --primary-foreground: #ffffff;
+  --secondary: #f0e0a0;
+  --secondary-foreground: #2a200a;
+  --muted: #f0e0a0;
+  --muted-foreground: #786020;
+  --accent: #a18229;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #f0e0a0;
+  --input: #f0e0a0;
+  --ring: #a18229;
+  --sidebar: #fdf3d0;
+  --sidebar-foreground: #2a200a;
+  --sidebar-primary: #a18229;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #f0e0a0;
+  --sidebar-accent-foreground: #2a200a;
+  --sidebar-border: #f0e0a0;
+  --sidebar-ring: #a18229;
+}
+.theme-gold.dark {
+  --background: #0e0800;
+  --foreground: #fff0d0;
+  --card: #1a1200;
+  --card-foreground: #fff0d0;
+  --popover: #1a1200;
+  --popover-foreground: #fff0d0;
+  --primary: #d4af37;
+  --primary-foreground: #0e0800;
+  --secondary: #2a1f00;
+  --secondary-foreground: #fff0d0;
+  --muted: #2a1f00;
+  --muted-foreground: #a07c30;
+  --accent: #d4af37;
+  --accent-foreground: #0e0800;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2a1f00;
+  --input: #2a1f00;
+  --ring: #d4af37;
+  --sidebar: #1a1200;
+  --sidebar-foreground: #fff0d0;
+  --sidebar-primary: #d4af37;
+  --sidebar-primary-foreground: #0e0800;
+  --sidebar-accent: #d4af37;
+  --sidebar-accent-foreground: #0e0800;
+  --sidebar-border: #2a1f00;
+  --sidebar-ring: #d4af37;
+}
--- a/apps/web/src/styles/themes/gunmetal.css
+++ b/apps/web/src/styles/themes/gunmetal.css
@@ -0,0 +1,60 @@
+/* themes-v1: Gunmetal (family: charcoal/black).
+   Dark anchors: #0d1117 #161b22 #21262d #7d8590 #388bfd. */
+.theme-gunmetal {
+  --background: #fafafa;
+  --foreground: #14181f;
+  --card: #f1f3f6;
+  --card-foreground: #14181f;
+  --popover: #f1f3f6;
+  --popover-foreground: #14181f;
+  --primary: #0c6dd0;
+  --primary-foreground: #ffffff;
+  --secondary: #dde1e8;
+  --secondary-foreground: #14181f;
+  --muted: #dde1e8;
+  --muted-foreground: #5a6470;
+  --accent: #0c6dd0;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #dde1e8;
+  --input: #dde1e8;
+  --ring: #0c6dd0;
+  --sidebar: #f1f3f6;
+  --sidebar-foreground: #14181f;
+  --sidebar-primary: #0c6dd0;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #dde1e8;
+  --sidebar-accent-foreground: #14181f;
+  --sidebar-border: #dde1e8;
+  --sidebar-ring: #0c6dd0;
+}
+.theme-gunmetal.dark {
+  --background: #0d1117;
+  --foreground: #e6ecf0;
+  --card: #161b22;
+  --card-foreground: #e6ecf0;
+  --popover: #161b22;
+  --popover-foreground: #e6ecf0;
+  --primary: #388bfd;
+  --primary-foreground: #0d1117;
+  --secondary: #21262d;
+  --secondary-foreground: #e6ecf0;
+  --muted: #21262d;
+  --muted-foreground: #7d8590;
+  --accent: #388bfd;
+  --accent-foreground: #0d1117;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #21262d;
+  --input: #21262d;
+  --ring: #388bfd;
+  --sidebar: #161b22;
+  --sidebar-foreground: #e6ecf0;
+  --sidebar-primary: #388bfd;
+  --sidebar-primary-foreground: #0d1117;
+  --sidebar-accent: #388bfd;
+  --sidebar-accent-foreground: #0d1117;
+  --sidebar-border: #21262d;
+  --sidebar-ring: #388bfd;
+}
--- a/apps/web/src/styles/themes/ivory.css
+++ b/apps/web/src/styles/themes/ivory.css
@@ -0,0 +1,33 @@
+/* themes-v1: Ivory (family: light-only).
+   Anchors used directly as light palette: #fdfcf8 #f5f2e8 #e8e4d8 #8a8478 #3a3328.
+   No .theme-ivory.dark — selecting dark mode on ivory falls back to obsidian
+   dark via lib/theme.ts. */
+.theme-ivory {
+  --background: #fdfcf8;
+  --foreground: #3a3328;
+  --card: #f5f2e8;
+  --card-foreground: #3a3328;
+  --popover: #f5f2e8;
+  --popover-foreground: #3a3328;
+  --primary: #3a3328;
+  --primary-foreground: #fdfcf8;
+  --secondary: #e8e4d8;
+  --secondary-foreground: #3a3328;
+  --muted: #e8e4d8;
+  --muted-foreground: #8a8478;
+  --accent: #3a3328;
+  --accent-foreground: #fdfcf8;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e8e4d8;
+  --input: #e8e4d8;
+  --ring: #3a3328;
+  --sidebar: #f5f2e8;
+  --sidebar-foreground: #3a3328;
+  --sidebar-primary: #3a3328;
+  --sidebar-primary-foreground: #fdfcf8;
+  --sidebar-accent: #e8e4d8;
+  --sidebar-accent-foreground: #3a3328;
+  --sidebar-border: #e8e4d8;
+  --sidebar-ring: #3a3328;
+}
--- a/apps/web/src/styles/themes/matrix.css
+++ b/apps/web/src/styles/themes/matrix.css
@@ -0,0 +1,60 @@
+/* themes-v1: Matrix (family: green, neon).
+   Dark anchors: #000a00 #031403 #0a200a #208030 #00ff41. */
+.theme-matrix {
+  --background: #f0fff4;
+  --foreground: #0a2a15;
+  --card: #e0f8e8;
+  --card-foreground: #0a2a15;
+  --popover: #e0f8e8;
+  --popover-foreground: #0a2a15;
+  --primary: #00b830;
+  --primary-foreground: #ffffff;
+  --secondary: #c0e8d0;
+  --secondary-foreground: #0a2a15;
+  --muted: #c0e8d0;
+  --muted-foreground: #208048;
+  --accent: #00b830;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #c0e8d0;
+  --input: #c0e8d0;
+  --ring: #00b830;
+  --sidebar: #e0f8e8;
+  --sidebar-foreground: #0a2a15;
+  --sidebar-primary: #00b830;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #c0e8d0;
+  --sidebar-accent-foreground: #0a2a15;
+  --sidebar-border: #c0e8d0;
+  --sidebar-ring: #00b830;
+}
+.theme-matrix.dark {
+  --background: #000a00;
+  --foreground: #d8f8e0;
+  --card: #031403;
+  --card-foreground: #d8f8e0;
+  --popover: #031403;
+  --popover-foreground: #d8f8e0;
+  --primary: #00ff41;
+  --primary-foreground: #000a00;
+  --secondary: #0a200a;
+  --secondary-foreground: #d8f8e0;
+  --muted: #0a200a;
+  --muted-foreground: #208030;
+  --accent: #00ff41;
+  --accent-foreground: #000a00;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #0a200a;
+  --input: #0a200a;
+  --ring: #00ff41;
+  --sidebar: #031403;
+  --sidebar-foreground: #d8f8e0;
+  --sidebar-primary: #00ff41;
+  --sidebar-primary-foreground: #000a00;
+  --sidebar-accent: #00ff41;
+  --sidebar-accent-foreground: #000a00;
+  --sidebar-border: #0a200a;
+  --sidebar-ring: #00ff41;
+}
--- a/apps/web/src/styles/themes/midnight-sapphire.css
+++ b/apps/web/src/styles/themes/midnight-sapphire.css
@@ -0,0 +1,60 @@
+/* themes-v1: Midnight Sapphire (family: blue).
+   Dark anchors: #02050e #060c1f #0e1a36 #4a6088 #1e3a8a. */
+.theme-midnight-sapphire {
+  --background: #f4f6fc;
+  --foreground: #0a1024;
+  --card: #e6eaf6;
+  --card-foreground: #0a1024;
+  --popover: #e6eaf6;
+  --popover-foreground: #0a1024;
+  --primary: #142a60;
+  --primary-foreground: #ffffff;
+  --secondary: #d0d8ec;
+  --secondary-foreground: #0a1024;
+  --muted: #d0d8ec;
+  --muted-foreground: #36507a;
+  --accent: #142a60;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #d0d8ec;
+  --input: #d0d8ec;
+  --ring: #142a60;
+  --sidebar: #e6eaf6;
+  --sidebar-foreground: #0a1024;
+  --sidebar-primary: #142a60;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #d0d8ec;
+  --sidebar-accent-foreground: #0a1024;
+  --sidebar-border: #d0d8ec;
+  --sidebar-ring: #142a60;
+}
+.theme-midnight-sapphire.dark {
+  --background: #02050e;
+  --foreground: #dce0f0;
+  --card: #060c1f;
+  --card-foreground: #dce0f0;
+  --popover: #060c1f;
+  --popover-foreground: #dce0f0;
+  --primary: #1e3a8a;
+  --primary-foreground: #dce0f0;
+  --secondary: #0e1a36;
+  --secondary-foreground: #dce0f0;
+  --muted: #0e1a36;
+  --muted-foreground: #4a6088;
+  --accent: #1e3a8a;
+  --accent-foreground: #dce0f0;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #0e1a36;
+  --input: #0e1a36;
+  --ring: #1e3a8a;
+  --sidebar: #060c1f;
+  --sidebar-foreground: #dce0f0;
+  --sidebar-primary: #1e3a8a;
+  --sidebar-primary-foreground: #dce0f0;
+  --sidebar-accent: #1e3a8a;
+  --sidebar-accent-foreground: #dce0f0;
+  --sidebar-border: #0e1a36;
+  --sidebar-ring: #1e3a8a;
+}
--- a/apps/web/src/styles/themes/obsidian.css
+++ b/apps/web/src/styles/themes/obsidian.css
@@ -0,0 +1,60 @@
+/* themes-v1: Obsidian (family: charcoal/black). Default theme.
+   Dark anchors: #0c0c0e #15151a #1f1f23 #6b6b75 #8b5cf6. Light variant per spec §3. */
+.theme-obsidian {
+  --background: #fafafa;
+  --foreground: #18181b;
+  --card: #f4f4f5;
+  --card-foreground: #18181b;
+  --popover: #f4f4f5;
+  --popover-foreground: #18181b;
+  --primary: #6d40e8;
+  --primary-foreground: #ffffff;
+  --secondary: #e4e4e7;
+  --secondary-foreground: #18181b;
+  --muted: #e4e4e7;
+  --muted-foreground: #71717a;
+  --accent: #6d40e8;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e4e4e7;
+  --input: #e4e4e7;
+  --ring: #6d40e8;
+  --sidebar: #f4f4f5;
+  --sidebar-foreground: #18181b;
+  --sidebar-primary: #6d40e8;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #e4e4e7;
+  --sidebar-accent-foreground: #18181b;
+  --sidebar-border: #e4e4e7;
+  --sidebar-ring: #6d40e8;
+}
+.theme-obsidian.dark {
+  --background: #0c0c0e;
+  --foreground: #ece9f0;
+  --card: #15151a;
+  --card-foreground: #ece9f0;
+  --popover: #15151a;
+  --popover-foreground: #ece9f0;
+  --primary: #8b5cf6;
+  --primary-foreground: #0c0c0e;
+  --secondary: #1f1f23;
+  --secondary-foreground: #ece9f0;
+  --muted: #1f1f23;
+  --muted-foreground: #6b6b75;
+  --accent: #8b5cf6;
+  --accent-foreground: #0c0c0e;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #1f1f23;
+  --input: #1f1f23;
+  --ring: #8b5cf6;
+  --sidebar: #15151a;
+  --sidebar-foreground: #ece9f0;
+  --sidebar-primary: #8b5cf6;
+  --sidebar-primary-foreground: #0c0c0e;
+  --sidebar-accent: #8b5cf6;
+  --sidebar-accent-foreground: #0c0c0e;
+  --sidebar-border: #1f1f23;
+  --sidebar-ring: #8b5cf6;
+}
--- a/apps/web/src/styles/themes/oxblood.css
+++ b/apps/web/src/styles/themes/oxblood.css
@@ -0,0 +1,60 @@
+/* themes-v1: Oxblood (family: red/crimson).
+   Dark anchors: #0a0303 #180606 #2a0808 #7a3028 #8b1a1a. */
+.theme-oxblood {
+  --background: #fdf4f4;
+  --foreground: #2a0a0a;
+  --card: #fae6e6;
+  --card-foreground: #2a0a0a;
+  --popover: #fae6e6;
+  --popover-foreground: #2a0a0a;
+  --primary: #5e1010;
+  --primary-foreground: #ffffff;
+  --secondary: #f0d0d0;
+  --secondary-foreground: #2a0a0a;
+  --muted: #f0d0d0;
+  --muted-foreground: #582020;
+  --accent: #5e1010;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #f0d0d0;
+  --input: #f0d0d0;
+  --ring: #5e1010;
+  --sidebar: #fae6e6;
+  --sidebar-foreground: #2a0a0a;
+  --sidebar-primary: #5e1010;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #f0d0d0;
+  --sidebar-accent-foreground: #2a0a0a;
+  --sidebar-border: #f0d0d0;
+  --sidebar-ring: #5e1010;
+}
+.theme-oxblood.dark {
+  --background: #0a0303;
+  --foreground: #f0d8d8;
+  --card: #180606;
+  --card-foreground: #f0d8d8;
+  --popover: #180606;
+  --popover-foreground: #f0d8d8;
+  --primary: #8b1a1a;
+  --primary-foreground: #0a0303;
+  --secondary: #2a0808;
+  --secondary-foreground: #f0d8d8;
+  --muted: #2a0808;
+  --muted-foreground: #7a3028;
+  --accent: #8b1a1a;
+  --accent-foreground: #0a0303;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2a0808;
+  --input: #2a0808;
+  --ring: #8b1a1a;
+  --sidebar: #180606;
+  --sidebar-foreground: #f0d8d8;
+  --sidebar-primary: #8b1a1a;
+  --sidebar-primary-foreground: #0a0303;
+  --sidebar-accent: #8b1a1a;
+  --sidebar-accent-foreground: #0a0303;
+  --sidebar-border: #2a0808;
+  --sidebar-ring: #8b1a1a;
+}
--- a/apps/web/src/styles/themes/plum.css
+++ b/apps/web/src/styles/themes/plum.css
@@ -0,0 +1,60 @@
+/* themes-v1: Plum (family: purple/violet).
+   Dark anchors: #0c0814 #180e20 #241830 #7a4878 #8e4585. */
+.theme-plum {
+  --background: #fbf7fd;
+  --foreground: #1f0f24;
+  --card: #f4ebf6;
+  --card-foreground: #1f0f24;
+  --popover: #f4ebf6;
+  --popover-foreground: #1f0f24;
+  --primary: #6a3263;
+  --primary-foreground: #ffffff;
+  --secondary: #e8d8ea;
+  --secondary-foreground: #1f0f24;
+  --muted: #e8d8ea;
+  --muted-foreground: #5e3858;
+  --accent: #6a3263;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e8d8ea;
+  --input: #e8d8ea;
+  --ring: #6a3263;
+  --sidebar: #f4ebf6;
+  --sidebar-foreground: #1f0f24;
+  --sidebar-primary: #6a3263;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #e8d8ea;
+  --sidebar-accent-foreground: #1f0f24;
+  --sidebar-border: #e8d8ea;
+  --sidebar-ring: #6a3263;
+}
+.theme-plum.dark {
+  --background: #0c0814;
+  --foreground: #ecd8ec;
+  --card: #180e20;
+  --card-foreground: #ecd8ec;
+  --popover: #180e20;
+  --popover-foreground: #ecd8ec;
+  --primary: #8e4585;
+  --primary-foreground: #0c0814;
+  --secondary: #241830;
+  --secondary-foreground: #ecd8ec;
+  --muted: #241830;
+  --muted-foreground: #7a4878;
+  --accent: #8e4585;
+  --accent-foreground: #0c0814;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #241830;
+  --input: #241830;
+  --ring: #8e4585;
+  --sidebar: #180e20;
+  --sidebar-foreground: #ecd8ec;
+  --sidebar-primary: #8e4585;
+  --sidebar-primary-foreground: #0c0814;
+  --sidebar-accent: #8e4585;
+  --sidebar-accent-foreground: #0c0814;
+  --sidebar-border: #241830;
+  --sidebar-ring: #8e4585;
+}
--- a/apps/web/src/styles/themes/sage.css
+++ b/apps/web/src/styles/themes/sage.css
@@ -0,0 +1,60 @@
+/* themes-v1: Sage (family: green, warm).
+   Dark anchors: #0a0e08 #141a10 #1e2e1a #7a8870 #9caf88. */
+.theme-sage {
+  --background: #f4f8f0;
+  --foreground: #1a2510;
+  --card: #ebf2e2;
+  --card-foreground: #1a2510;
+  --popover: #ebf2e2;
+  --popover-foreground: #1a2510;
+  --primary: #708868;
+  --primary-foreground: #ffffff;
+  --secondary: #d8e2c8;
+  --secondary-foreground: #1a2510;
+  --muted: #d8e2c8;
+  --muted-foreground: #5a6850;
+  --accent: #708868;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #d8e2c8;
+  --input: #d8e2c8;
+  --ring: #708868;
+  --sidebar: #ebf2e2;
+  --sidebar-foreground: #1a2510;
+  --sidebar-primary: #708868;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #d8e2c8;
+  --sidebar-accent-foreground: #1a2510;
+  --sidebar-border: #d8e2c8;
+  --sidebar-ring: #708868;
+}
+.theme-sage.dark {
+  --background: #0a0e08;
+  --foreground: #e8eee0;
+  --card: #141a10;
+  --card-foreground: #e8eee0;
+  --popover: #141a10;
+  --popover-foreground: #e8eee0;
+  --primary: #9caf88;
+  --primary-foreground: #0a0e08;
+  --secondary: #1e2e1a;
+  --secondary-foreground: #e8eee0;
+  --muted: #1e2e1a;
+  --muted-foreground: #7a8870;
+  --accent: #9caf88;
+  --accent-foreground: #0a0e08;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #1e2e1a;
+  --input: #1e2e1a;
+  --ring: #9caf88;
+  --sidebar: #141a10;
+  --sidebar-foreground: #e8eee0;
+  --sidebar-primary: #9caf88;
+  --sidebar-primary-foreground: #0a0e08;
+  --sidebar-accent: #9caf88;
+  --sidebar-accent-foreground: #0a0e08;
+  --sidebar-border: #1e2e1a;
+  --sidebar-ring: #9caf88;
+}
--- a/apps/web/src/styles/themes/steel-pink.css
+++ b/apps/web/src/styles/themes/steel-pink.css
@@ -0,0 +1,60 @@
+/* themes-v1: Steel Pink (family: pink/magenta).
+   Dark anchors: #0e0408 #1a080e #2e0c1a #9a4070 #cc33aa. */
+.theme-steel-pink {
+  --background: #fdf4fa;
+  --foreground: #2a0a1f;
+  --card: #fbe8f4;
+  --card-foreground: #2a0a1f;
+  --popover: #fbe8f4;
+  --popover-foreground: #2a0a1f;
+  --primary: #952382;
+  --primary-foreground: #ffffff;
+  --secondary: #f4d4ea;
+  --secondary-foreground: #2a0a1f;
+  --muted: #f4d4ea;
+  --muted-foreground: #7a3058;
+  --accent: #952382;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #f4d4ea;
+  --input: #f4d4ea;
+  --ring: #952382;
+  --sidebar: #fbe8f4;
+  --sidebar-foreground: #2a0a1f;
+  --sidebar-primary: #952382;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #f4d4ea;
+  --sidebar-accent-foreground: #2a0a1f;
+  --sidebar-border: #f4d4ea;
+  --sidebar-ring: #952382;
+}
+.theme-steel-pink.dark {
+  --background: #0e0408;
+  --foreground: #f0d8e8;
+  --card: #1a080e;
+  --card-foreground: #f0d8e8;
+  --popover: #1a080e;
+  --popover-foreground: #f0d8e8;
+  --primary: #cc33aa;
+  --primary-foreground: #0e0408;
+  --secondary: #2e0c1a;
+  --secondary-foreground: #f0d8e8;
+  --muted: #2e0c1a;
+  --muted-foreground: #9a4070;
+  --accent: #cc33aa;
+  --accent-foreground: #0e0408;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2e0c1a;
+  --input: #2e0c1a;
+  --ring: #cc33aa;
+  --sidebar: #1a080e;
+  --sidebar-foreground: #f0d8e8;
+  --sidebar-primary: #cc33aa;
+  --sidebar-primary-foreground: #0e0408;
+  --sidebar-accent: #cc33aa;
+  --sidebar-accent-foreground: #0e0408;
+  --sidebar-border: #2e0c1a;
+  --sidebar-ring: #cc33aa;
+}
--- a/apps/web/src/styles/themes/volcanic-brown.css
+++ b/apps/web/src/styles/themes/volcanic-brown.css
@@ -0,0 +1,60 @@
+/* themes-v1: Volcanic Brown (family: brown/earth).
+   Dark anchors: #140906 #1e0e0a #2e1610 #7a4030 #cc4a1a. */
+.theme-volcanic-brown {
+  --background: #faf3ee;
+  --foreground: #2a1410;
+  --card: #f3e6dc;
+  --card-foreground: #2a1410;
+  --popover: #f3e6dc;
+  --popover-foreground: #2a1410;
+  --primary: #983614;
+  --primary-foreground: #ffffff;
+  --secondary: #e8d4c4;
+  --secondary-foreground: #2a1410;
+  --muted: #e8d4c4;
+  --muted-foreground: #5e2818;
+  --accent: #983614;
+  --accent-foreground: #ffffff;
+  --destructive: #b91c1c;
+  --destructive-foreground: #ffffff;
+  --border: #e8d4c4;
+  --input: #e8d4c4;
+  --ring: #983614;
+  --sidebar: #f3e6dc;
+  --sidebar-foreground: #2a1410;
+  --sidebar-primary: #983614;
+  --sidebar-primary-foreground: #ffffff;
+  --sidebar-accent: #e8d4c4;
+  --sidebar-accent-foreground: #2a1410;
+  --sidebar-border: #e8d4c4;
+  --sidebar-ring: #983614;
+}
+.theme-volcanic-brown.dark {
+  --background: #140906;
+  --foreground: #f0e0d4;
+  --card: #1e0e0a;
+  --card-foreground: #f0e0d4;
+  --popover: #1e0e0a;
+  --popover-foreground: #f0e0d4;
+  --primary: #cc4a1a;
+  --primary-foreground: #140906;
+  --secondary: #2e1610;
+  --secondary-foreground: #f0e0d4;
+  --muted: #2e1610;
+  --muted-foreground: #7a4030;
+  --accent: #cc4a1a;
+  --accent-foreground: #140906;
+  --destructive: #dc2626;
+  --destructive-foreground: #ffffff;
+  --border: #2e1610;
+  --input: #2e1610;
+  --ring: #cc4a1a;
+  --sidebar: #1e0e0a;
+  --sidebar-foreground: #f0e0d4;
+  --sidebar-primary: #cc4a1a;
+  --sidebar-primary-foreground: #140906;
+  --sidebar-accent: #cc4a1a;
+  --sidebar-accent-foreground: #140906;
+  --sidebar-border: #2e1610;
+  --sidebar-ring: #cc4a1a;
+}