# Rule: theming

Binding for every colour, font size, spacing value, and breakpoint.

**Read [`../context/design-system.md`](../context/design-system.md) first.** The
current CSS has three drifting palettes and a broken `@font-face`. This rule
describes the target; that file describes what you are migrating from.

## One token layer

Every value comes from `src/styles/tokens.css`. If a component needs a value
that is not a token, either it is a genuine one-off (justify it in a comment) or
the token layer is missing something (add it there, not inline).

```css
/* forbidden */
color: #172f42;
color: rgba(23, 47, 66, 0.6);

/* required */
color: var(--ink);
color: var(--muted);
```

No raw hex outside `tokens.css`. `.agents/scripts/check-tokens.mjs` enforces it;
wire it into `pnpm run verify`.

## Semantic names, not literal ones

`--ink`, `--paper`, `--muted`, `--line`, `--accent`, `--gold`, `--blue`,
`--deep` are the existing vocabulary. Keep it — it is already semantic and the
team reads it fluently. Do not rename to `--color-neutral-900`.

If a genuine second surface is needed, extend semantically (`--surface-lab`,
`--ink-inverse`), never numerically.

## Type scale

Replace the 14 ad-hoc `clamp()` triples with named steps:

```css
--step-display: clamp(56px, 9vw, 126px); /* h1 */
--step-6: clamp(36px, 5vw, 65px); /* section h2 */
--step-5: clamp(24px, 3vw, 38px); /* sub-head */
--step-4: clamp(22px, 3vw, 36px); /* pull-quote */
--step-1: 15px; /* body */
--step-0: 11px; /* eyebrow / label */
```

The eyebrow treatment (`10–11px` monospace, `letter-spacing:.08–.1em`,
uppercase) is a signature of this design. Make it one class, not fifteen
repetitions.

## Breakpoints

Five named widths replace the current sixteen:

```css
--bp-sm: 560px;
--bp-md: 800px;
--bp-lg: 1100px;
--bp-xl: 1600px;
--bp-2xl: 2200px;
```

When collapsing a component's old breakpoint onto a named one, screenshot at the
**old** value. That is where the regression will be.

## Preserve the house style

- Flat colour blocks, hairline `1px` rules, near-zero border-radius.
- Tight negative tracking on display type (`-.06em` … `-.08em`).
- Grid separators built as `gap:1px` over a coloured parent background. This is
  deliberate. Do not "fix" it into `border`.
- `Georgia, serif` for emphasis spans (`h1 em`). It renders today; keep it.

## Fonts

Do not add a webfont without an explicit decision recorded in the task. The
intended Manrope/DM Mono has never rendered; introducing it is a visual
redesign, not a refactor. Default: match what renders today.
