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+# Dark Theme Palette Rework Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Replace the dark theme's palette with a systematically generated one, and decouple the colour-picker swatch from the note card surface so the twelve colours are distinguishable.
+
+**Architecture:** Purely a colour-data and CSS-variable change. `NOTE_COLORS_DARK` in `src/lib/utils/colors.ts` gets new values; a new `NOTE_CHIPS_DARK` map plus `getNoteChip()` serves the picker only. The `[data-theme="dark"]` block in `src/app.css` is rewritten. Consumers (`NoteCard`, `NoteEditor`, the public share page) already resolve colour through `getNoteColor()` and need no changes — only `ColorPicker.svelte` switches functions.
+
+**Tech Stack:** SvelteKit + Svelte 5 runes, Tailwind CSS v4, Vitest (unit), Playwright (e2e), pnpm.
+
+**Spec:** `docs/superpowers/specs/2026-07-31-dark-palette-design.md`
+
+## Global Constraints
+
+- Light mode must not change. Any diff touching `NOTE_COLORS` (the light map) or `:root` colour values other than the new `--accent-check` is out of scope.
+- Never hardcode Tailwind colours (`text-gray-500`, `bg-red-600`). Always reference CSS variables. (Project rule, `CLAUDE.md`.)
+- Run `pnpm check` before every commit — not just tests. (Project rule.)
+- Run `pnpm build` before `pnpm test:e2e` locally, or e2e tests run against a stale bundle.
+- Conventional commit prefixes: `feat:`, `fix:`, `chore:`, `docs:`, `refactor:`, `test:`.
+- Exact dark palette values are given verbatim in each task. Do not re-derive or "improve" them — they were generated to hold WCAG AA against `--text` and `--text-muted` on all twelve surfaces, and hand-tweaking breaks that.
+
+---
+
+### Task 1: New dark note-card colours
+
+**Files:**
+- Modify: `src/lib/utils/colors.ts:18-31` (the `NOTE_COLORS_DARK` map)
+- Test: `src/lib/utils/colors.test.ts`
+- Modify: `tests/e2e/public-sharing.spec.ts` (asserted dark `fog` value)
+- Modify: `tests/e2e/dark-mode.spec.ts:84` (stale comment)
+
+**Interfaces:**
+- Consumes: nothing from earlier tasks.
+- Produces: `NOTE_COLORS_DARK` with the values below. `getNoteColor(color: NoteColor, isDark: boolean): string` keeps its existing signature. Task 2 relies on `getNoteColor` being unchanged; Task 2's chip values must differ from every value here.
+
+- [ ] **Step 1: Write the failing invariant tests**
+
+Add to `src/lib/utils/colors.test.ts`. These assert the *properties* that broke, not the hex strings — a hex-only test would have passed happily on the old broken palette.
+
+```ts
+/** WCAG relative luminance. */
+function relativeLuminance(hex: string): number {
+	const n = parseInt(hex.slice(1), 16);
+	const channels = [(n >> 16) & 255, (n >> 8) & 255, n & 255].map((v) => {
+		const s = v / 255;
+		return s <= 0.03928 ? s / 12.92 : Math.pow((s + 0.055) / 1.055, 2.4);
+	});
+	return 0.2126 * channels[0] + 0.7152 * channels[1] + 0.0722 * channels[2];
+}
+
+function contrastRatio(a: string, b: string): number {
+	const [l1, l2] = [relativeLuminance(a), relativeLuminance(b)];
+	return (Math.max(l1, l2) + 0.05) / (Math.min(l1, l2) + 0.05);
+}
+
+describe('dark note colours', () => {
+	// Must track [data-theme="dark"] in src/app.css.
+	const DARK_TEXT = '#ece3d3';
+	const DARK_TEXT_MUTED = '#b3a695';
+
+	it('keeps body text above the AA threshold on every dark card', () => {
+		for (const [name, { bg }] of Object.entries(NOTE_COLORS_DARK)) {
+			expect(contrastRatio(bg, DARK_TEXT), `${name} (${bg})`).toBeGreaterThanOrEqual(4.5);
+		}
+	});
+
+	it('keeps muted text above the AA threshold on every dark card', () => {
+		// This is the invariant the old palette broke: muted/struck-through text
+		// became unreadable on the lighter surfaces.
+		for (const [name, { bg }] of Object.entries(NOTE_COLORS_DARK)) {
+			expect(contrastRatio(bg, DARK_TEXT_MUTED), `${name} (${bg})`).toBeGreaterThanOrEqual(4.5);
+		}
+	});
+
+	it('holds the twelve surfaces within a narrow lightness band so they read as a family', () => {
+		const luminances = Object.values(NOTE_COLORS_DARK).map((c) => relativeLuminance(c.bg));
+		expect(Math.max(...luminances) - Math.min(...luminances)).toBeLessThan(0.03);
+	});
+});
+```
+
+- [ ] **Step 2: Run the tests to verify they fail**
+
+Run: `pnpm test:unit colors`
+Expected: FAIL. The muted-text test fails on several colours (the old `#4a2522` family sits too close to `#b3a695`), and the lightness-band test fails because the old values wander.
+
+- [ ] **Step 3: Replace the dark palette**
+
+In `src/lib/utils/colors.ts`, replace the whole `NOTE_COLORS_DARK` map with these values exactly:
+
+```ts
+export const NOTE_COLORS_DARK: Record<NoteColor, { bg: string; label: string }> = {
+	default: { bg: '#21201f', label: 'Default' },
+	coral: { bg: '#3f1f1c', label: 'Coral' },
+	peach: { bg: '#3f2b1c', label: 'Peach' },
+	sand: { bg: '#3c371b', label: 'Sand' },
+	mint: { bg: '#2a3d1d', label: 'Mint' },
+	sage: { bg: '#1f3d36', label: 'Sage' },
+	fog: { bg: '#253946', label: 'Fog' },
+	storm: { bg: '#1d283d', label: 'Storm' },
+	dusk: { bg: '#3d2843', label: 'Dusk' },
+	blossom: { bg: '#3d2129', label: 'Blossom' },
+	clay: { bg: '#363126', label: 'Clay' },
+	chalk: { bg: '#303036', label: 'Chalk' }
+};
+```
+
+Note for the implementer: `blossom` and `storm` intentionally shift hue relative to their light counterparts (toward pink and true blue). At higher chroma the original hues collided with `coral`/`peach` and `fog`. This is deliberate — see the spec.
+
+- [ ] **Step 4: Update the two hex assertions that pin the old values**
+
+In `src/lib/utils/colors.test.ts`, the existing `getNoteColor` tests assert old hexes. Change them:
+
+```ts
+	it('returns dark color when isDark is true', () => {
+		expect(getNoteColor('default', true)).toBe('#21201f');
+		expect(getNoteColor('coral', true)).toBe('#3f1f1c');
+	});
+
+	it('returns default color for unknown color name', () => {
+		expect(getNoteColor('unknown' as any, false)).toBe('#faf5eb');
+		expect(getNoteColor('unknown' as any, true)).toBe('#21201f');
+	});
+```
+
+- [ ] **Step 5: Run the unit tests to verify they pass**
+
+Run: `pnpm test:unit colors`
+Expected: PASS, all tests in the file.
+
+- [ ] **Step 6: Update the e2e test that asserts a dark note colour**
+
+`tests/e2e/public-sharing.spec.ts` — the "Shared note follows a dark-mode visitor theme" scenario asserts dark `fog`. `#253946` is `rgb(37, 57, 70)`:
+
+```ts
+		await expect(publicPage.getByTestId('shared-note')).toHaveCSS(
+			'background-color',
+			'rgb(37, 57, 70)'
+		);
+```
+
+In `tests/e2e/dark-mode.spec.ts:84`, the assertion itself is a negative one (`not.toBe` light default) and needs no change, but its comment names the old hex. Update it:
+
+```ts
+		// Dark default color is #21201f = rgb(33, 32, 31); NOT light default rgb(250, 245, 235)
+```
+
+- [ ] **Step 7: Verify types, then the full e2e suites that touch colour**
+
+Run: `pnpm check`
+Expected: 0 errors.
+
+Run: `pnpm build && pnpm test:e2e public-sharing dark-mode organization`
+Expected: PASS. (`organization.spec.ts` exercises the picker but asserts no hex, so it should be unaffected — it is in the list to prove that.)
+
+- [ ] **Step 8: Commit**
+
+```bash
+git add src/lib/utils/colors.ts src/lib/utils/colors.test.ts tests/e2e/public-sharing.spec.ts tests/e2e/dark-mode.spec.ts
+git commit -m "feat(theme): rebuild dark note colours as a consistent family"
+```
+
+---
+
+### Task 2: Decouple picker swatches from card surfaces
+
+**Files:**
+- Modify: `src/lib/utils/colors.ts` (add `NOTE_CHIPS_DARK` and `getNoteChip`)
+- Modify: `src/lib/components/ColorPicker.svelte:2,19`
+- Test: `src/lib/utils/colors.test.ts`
+- Test: `tests/e2e/dark-mode.spec.ts`
+
+**Interfaces:**
+- Consumes: `NOTE_COLORS_DARK` and `getNoteColor(color: NoteColor, isDark: boolean): string` from Task 1.
+- Produces: `NOTE_CHIPS_DARK: Record<NoteColor, string>` and `getNoteChip(color: NoteColor, isDark: boolean): string`. No later task depends on these.
+
+- [ ] **Step 1: Write the failing tests**
+
+Add to `src/lib/utils/colors.test.ts`:
+
+```ts
+describe('getNoteChip', () => {
+	it('returns the card colour in light mode, where pastels already are the cards', () => {
+		for (const color of Object.keys(NOTE_COLORS) as NoteColor[]) {
+			expect(getNoteChip(color, false)).toBe(getNoteColor(color, false));
+		}
+	});
+
+	it('returns a distinct vivid chip in dark mode, not the card surface', () => {
+		for (const color of Object.keys(NOTE_COLORS_DARK) as NoteColor[]) {
+			expect(getNoteChip(color, true)).not.toBe(getNoteColor(color, true));
+		}
+	});
+
+	it('falls back to default for an unknown colour', () => {
+		expect(getNoteChip('unknown' as any, true)).toBe(NOTE_CHIPS_DARK.default);
+	});
+
+	it('has matching keys with the colour maps', () => {
+		expect(Object.keys(NOTE_CHIPS_DARK).sort()).toEqual(Object.keys(NOTE_COLORS_DARK).sort());
+	});
+
+	it('keeps every pair of chips far enough apart to tell apart at 28px', () => {
+		// The regression this guards: at low chroma coral/peach/blossom and
+		// fog/storm collapse into each other.
+		const entries = Object.entries(NOTE_CHIPS_DARK);
+		for (let i = 0; i < entries.length; i++) {
+			for (let j = i + 1; j < entries.length; j++) {
+				const [[nameA, a], [nameB, b]] = [entries[i], entries[j]];
+				const toRgb = (hex: string) => {
+					const n = parseInt(hex.slice(1), 16);
+					return [(n >> 16) & 255, (n >> 8) & 255, n & 255];
+				};
+				const [ra, ga, ba] = toRgb(a);
+				const [rb, gb, bb] = toRgb(b);
+				const distance = Math.hypot(ra - rb, ga - gb, ba - bb);
+				expect(distance, `${nameA} vs ${nameB}`).toBeGreaterThan(25);
+			}
+		}
+	});
+});
+```
+
+Extend the import at the top of the file:
+
+```ts
+import {
+	getNoteColor,
+	getNoteChip,
+	NOTE_COLORS,
+	NOTE_COLORS_DARK,
+	NOTE_CHIPS_DARK
+} from '$lib/utils/colors.js';
+import type { NoteColor } from '$lib/types/index.js';
+```
+
+- [ ] **Step 2: Run the tests to verify they fail**
+
+Run: `pnpm test:unit colors`
+Expected: FAIL — `getNoteChip is not a function` / `NOTE_CHIPS_DARK` undefined.
+
+- [ ] **Step 3: Add the chip map and accessor**
+
+Append to `src/lib/utils/colors.ts`, after `getNoteColor`:
+
+```ts
+/**
+ * Picker swatches are labels, not surfaces. A 28px circle at card lightness
+ * reads as a grey dot — small patches lose apparent saturation — so the dark
+ * picker uses vivid mid-lightness chips that share the card's hue but not its
+ * lightness. Light mode needs no equivalent: there the pastels are the cards.
+ */
+export const NOTE_CHIPS_DARK: Record<NoteColor, string> = {
+	default: '#8d857c',
+	coral: '#d04f43',
+	peach: '#cd7c42',
+	sand: '#c7b138',
+	mint: '#7bbd4c',
+	sage: '#47b89d',
+	fog: '#609abe',
+	storm: '#547bc0',
+	dusk: '#a965bd',
+	blossom: '#c05d78',
+	clay: '#b5954a',
+	chalk: '#c3c3c8'
+};
+
+export function getNoteChip(color: NoteColor, isDark: boolean): string {
+	if (!isDark) return getNoteColor(color, false);
+	return NOTE_CHIPS_DARK[color] ?? NOTE_CHIPS_DARK.default;
+}
+```
+
+- [ ] **Step 4: Run the tests to verify they pass**
+
+Run: `pnpm test:unit colors`
+Expected: PASS.
+
+- [ ] **Step 5: Point the picker at the chips**
+
+In `src/lib/components/ColorPicker.svelte`, change the import on line 2 and the style on line 19:
+
+```svelte
+	import { COLOR_OPTIONS, getNoteChip } from '$lib/utils/colors.js';
+```
+
+```svelte
+			style="background-color: {getNoteChip(option.value, getIsDarkMode())}"
+```
+
+Leave everything else alone — the 2px `--border-subtle` ring stays, and it's what gives each swatch its boundary regardless of fill.
+
+- [ ] **Step 6: Add the e2e scenario**
+
+Append inside the `test.describe.serial('Dark mode', ...)` block in `tests/e2e/dark-mode.spec.ts`:
+
+```ts
+	test('Scenario: Colour picker swatches are identifiable in dark mode', async ({
+		authenticatedPage: page
+	}) => {
+		// Given dark theme is active
+		await page.goto('/settings/preferences');
+		await page.waitForLoadState('networkidle');
+		await page.getByTestId('pref-theme-dark').click();
+		await expect(page.locator('html')).toHaveAttribute('data-theme', 'dark');
+
+		// When the user opens the colour picker while editing a note
+		await page.goto('/');
+		await page.waitForLoadState('networkidle');
+		await page.getByTestId('new-note-btn').click();
+		await page.getByTestId('note-title-input').fill('Swatch Test');
+		await page.getByTestId('color-picker-toggle').click();
+		await expect(page.getByTestId('color-picker')).toBeVisible();
+
+		// Then a swatch shows its vivid chip rather than the muted card surface
+		await expect(page.getByTestId('color-coral')).toHaveCSS(
+			'background-color',
+			'rgb(208, 79, 67)'
+		);
+
+		await page.getByTestId('close-editor-btn').click();
+	});
+```
+
+- [ ] **Step 7: Verify**
+
+Run: `pnpm check`
+Expected: 0 errors.
+
+Run: `pnpm build && pnpm test:e2e dark-mode organization`
+Expected: PASS.
+
+- [ ] **Step 8: Commit**
+
+```bash
+git add src/lib/utils/colors.ts src/lib/utils/colors.test.ts src/lib/components/ColorPicker.svelte tests/e2e/dark-mode.spec.ts
+git commit -m "feat(theme): give the dark colour picker vivid identifiable chips"
+```
+
+---
+
+### Task 3: New dark CSS variables and checkbox accent
+
+**Files:**
+- Modify: `src/app.css:6-24` (`:root` — add `--accent-check` only), `src/app.css:26-42` (the `[data-theme="dark"]` block), `src/app.css:44-48` (`accent-color`)
+
+**Interfaces:**
+- Consumes: nothing. The `--text`/`--text-muted` values here must match the constants asserted in Task 1's tests (`#ece3d3`, `#b3a695`).
+- Produces: `--accent-check` custom property, available in both themes.
+
+- [ ] **Step 1: Add `--accent-check` to `:root`**
+
+In the `:root` block in `src/app.css`, after `--grid-dot`:
+
+```css
+	--grid-dot: #1a1a2e;
+	--accent-check: var(--primary);
+```
+
+- [ ] **Step 2: Replace the dark block**
+
+Replace the entire `[data-theme="dark"]` block with:
+
+```css
+[data-theme="dark"] {
+	--bg-base: #141312;
+	--bg-surface: #1e1c1b;
+	--primary: #e0a030;
+	--primary-hover: #f2b855;
+	--text: #ece3d3;
+	--text-muted: #b3a695;
+	--border: #57514b;
+	--border-subtle: #302d2b;
+	--destructive: #e2705c;
+	--error-bg: #3a2320;
+	--error-border: #5c3a34;
+	--error-text: #f0a898;
+	--success-bg: #1f2e1f;
+	--success-text: #8fc97a;
+	--card-shadow: 2px 2px 0px var(--border-subtle);
+	--card-shadow-hover: 3px 3px 0px var(--primary);
+	--grid-dot: #ece3d3;
+	/* Dimmed so a long done-list of gold checkboxes doesn't shout. */
+	--accent-check: #c8a44a;
+}
+```
+
+Two of these reverse earlier decisions on purpose: `--primary` is no longer shared with light mode (`#C8860A` reads mustard on ink), and `--border` is a warm mid-grey rather than the mirrored cream `#e8dcc8` (a bright 1px line on a dark background reads as glare, not structure).
+
+- [ ] **Step 3: Point `accent-color` at the new variable**
+
+In the `html, body` rule:
+
+```css
+html, body {
+	font-family: 'JetBrains Mono', monospace;
+	accent-color: var(--accent-check);
+	overscroll-behavior-y: none;
+}
+```
+
+- [ ] **Step 4: Verify light mode is untouched and dark mode renders**
+
+Run: `pnpm check`
+Expected: 0 errors.
+
+Run: `pnpm build && pnpm test:e2e dark-mode public-sharing`
+Expected: PASS. Task 1's e2e assertions cover the dark note colours; nothing asserts the chrome variables, so this step is proving no regression rather than proving the change.
+
+Then look at it: `pnpm preview`, open the app, switch to dark in Settings → Preferences, and check the notes grid, the sidebar, an open editor, and a checklist with done items. Contrast maths can't judge the pixel-grid overlay or the gold hover states.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add src/app.css
+git commit -m "feat(theme): replace dark surfaces, borders and accents with the warm ink palette"
+```
+
+---
+
+### Task 4: Sync the browser theme-colour with the new base
+
+**Files:**
+- Modify: `src/lib/utils/theme.svelte.ts:4`
+- Modify: `src/app.html:21`
+- Test: `src/lib/utils/theme.test.ts:40`
+
+**Interfaces:**
+- Consumes: `--bg-base` `#141312` from Task 3. These two hardcoded copies must equal it.
+- Produces: nothing.
+
+- [ ] **Step 1: Update the failing test first**
+
+In `src/lib/utils/theme.test.ts`:
+
+```ts
+	it('updates meta theme-color for dark mode', () => {
+		applyTheme('dark');
+		const meta = document.querySelector('meta[name="theme-color"]');
+		expect(meta?.getAttribute('content')).toBe('#141312');
+	});
+```
+
+- [ ] **Step 2: Run it to verify it fails**
+
+Run: `pnpm test:unit theme`
+Expected: FAIL — received `#1a1715`.
+
+- [ ] **Step 3: Update both hardcoded copies**
+
+`src/lib/utils/theme.svelte.ts` line 4:
+
+```ts
+const DARK_THEME_COLOR = '#141312';
+```
+
+`src/app.html` line 21, inside the FOUC script:
+
+```js
+            if (m) m.content = '#141312';
+```
+
+- [ ] **Step 4: Run the test to verify it passes**
+
+Run: `pnpm test:unit theme`
+Expected: PASS.
+
+- [ ] **Step 5: Verify and commit**
+
+Run: `pnpm check && pnpm test:unit`
+Expected: 0 errors, all unit tests pass.
+
+```bash
+git add src/lib/utils/theme.svelte.ts src/app.html src/lib/utils/theme.test.ts
+git commit -m "fix(theme): sync browser theme-colour with the new dark base"
+```
+
+---
+
+### Task 5: Document the palette
+
+**Files:**
+- Modify: `CLAUDE.md` (the "Design system: Retro Parchment" section)
+- Modify: `docs/ARCHITECTURE.md:155-165` (the dark mode section)
+
+**Interfaces:**
+- Consumes: everything from Tasks 1-4.
+- Produces: nothing.
+
+- [ ] **Step 1: Document the dark palette in `CLAUDE.md`**
+
+The colour table there lists only light values, which is why the dark palette drifted in the first place. After the existing table and the note about `src/lib/utils/colors.ts`, add:
+
+```markdown
+### Dark theme
+
+Dark mode overrides every colour variable in `[data-theme="dark"]` (`src/app.css`). It is not a
+mechanical inversion of light mode — two differences are deliberate:
+
+- **`--primary` differs per theme.** `#C8860A` on parchment, `#e0a030` on ink. The light gold reads
+  mustard on a dark background.
+- **`--border` is a warm mid-grey (`#57514b`), not mirrored cream.** A bright 1px line on a dark
+  background reads as glare rather than structure; the hard offset shadow carries the retro framing.
+
+Note colours have two representations, and they are not interchangeable:
+
+| Map | Function | Used by | Role |
+|---|---|---|---|
+| `NOTE_COLORS` / `NOTE_COLORS_DARK` | `getNoteColor(color, isDark)` | Cards, editor, share page | Quiet **surface** you read text on |
+| `NOTE_CHIPS_DARK` | `getNoteChip(color, isDark)` | `ColorPicker` only | Vivid **label** you identify at a glance |
+
+A dark card sits at ~18% lightness, where a 28px picker circle would read as a grey dot — small
+patches lose apparent saturation. Never fill a picker swatch with `getNoteColor()`. In light mode
+`getNoteChip()` returns the pastel card colour, because there the pastels *are* the cards.
+
+When changing any dark note colour, keep the invariants asserted in `src/lib/utils/colors.test.ts`:
+AA contrast against both `--text` and `--text-muted` on every surface, a narrow lightness band across
+the twelve, and no two chips closer than an RGB distance of 25.
+
+`--bg-base` is duplicated as a literal in `src/app.html` (FOUC script) and
+`src/lib/utils/theme.svelte.ts` (`DARK_THEME_COLOR`) for the browser theme-colour. Update all three
+together.
+```
+
+- [ ] **Step 2: Update `docs/ARCHITECTURE.md`**
+
+In the dark mode section, the line describing note colours currently mentions only `getNoteColor()`. Replace it with:
+
+```markdown
+- **Note card colors**: `getNoteColor()` in `src/lib/utils/colors.ts` accepts a `dark` boolean and
+  returns the appropriate surface variant per theme. Picker swatches use `getNoteChip()` instead —
+  in dark mode the card surfaces are too dark to be identifiable as small circles, so the picker
+  draws from a separate vivid `NOTE_CHIPS_DARK` map.
+```
+
+- [ ] **Step 3: Verify the docs match the code**
+
+Re-read both edited sections against `src/lib/utils/colors.ts` and `src/app.css`. Every function name, map name, file path and hex value must exist as written. No verification command can catch a wrong hex in prose — check it by eye.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add CLAUDE.md docs/ARCHITECTURE.md
+git commit -m "docs: document the dark palette and the card-vs-chip distinction"
+```
+
+---
+
+## Final verification
+
+- [ ] `pnpm check` — 0 errors
+- [ ] `pnpm test:unit` — all pass
+- [ ] `pnpm build && pnpm test:e2e` — full suite passes
+- [ ] Manual pass in dark mode: notes grid, sidebar, header, open editor, checklist with done items, colour picker, a public share link, an error state (e.g. a failed login), and light mode unchanged