adr-sml/docs/02-design-system.md

02 — Design system

Authority: AGENTS.md §3 D7 — keep the palette and the infinity mark; modernize the execution. The look is not up for redesign. What follows is the system that preserves it while fixing what the old build got wrong.

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What carries over unchanged

• The palette: cream, ink, maroon, gold.
• The infinity mark — SML Company Ltd.'s actual logo, and the metaphor holds: a dispute is a loop, and the work is redrawing the loop into a line. It is a shaded ribbon, not a stroked curve: a band of variable width that twists in three dimensions, maroon flowing into champagne, passing over itself at the crossing. Ink bounding box 2668 × 1704 = 1.5657:1 [verified 2026-08-26 — measured against the master]. Source of truth: src/assets/brand/sml-infinity-mark.png; provenance in docs/reference/brand-assets.md.
• The type pairing: Instrument Serif for display, Geist for text, Geist Mono for eyebrows and labels.
• The editorial register — generous whitespace, restrained colour, serif display type at large sizes.

What changes

Was	Is	Why
Google Fonts at runtime	Self-hosted, subset, preloaded	Removes a render-blocking third-party round trip from a page that collects legal inquiries
Fixed px type sizes	Fluid clamp() scale	One scale from 360 px to 1600 px with no breakpoint jumps
Ad hoc spacing values	8 px base scale	Consistent vertical rhythm; no magic numbers
Gold used as a text colour on cream	Gold restricted to decorative and on-dark	It fails WCAG AA at 2.10:1. Measured, not assumed
Scroll-reveal on every element, always on	Reveal on major sections only, gated behind prefers-reduced-motion	Motion that reads as confident rather than decorative; accessible by default
2.2 MB single file, ~1 MB of base64 logos (both figures under review — AGENTS.md Q34; and "470 KB PNG", which this row used to assert, has no source anywhere in the repo and has been removed)	Optimized SVG mark, AVIF/WebP photography	The mark is geometry, so it should be vector. That holds whatever the old file weighed
React 18 dev build + Babel Standalone in the browser	Static HTML, near-zero JS	The reason the site is invisible to crawlers

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Colour

Tokens live in src/styles/tokens.css. Never write a raw hex value in a component.

Token	Value	Use
--cream	#faf7f2	Page background
--cream-2	#f3ede0	Alternating section background
--cream-3	#ebe3d1	Cards and insets on cream
--ink	#1a1614	Body text; dark section backgrounds
--ink-soft	#3a322c	Secondary text
--muted	#6e6359	Metadata, captions — on cream only
--maroon	#5a1a1c	Primary action, accents, dark panels
--maroon-d	#3d1112	Hover on maroon
--maroon-l	#7a2a2c	Links on cream
--gold	#c9a876	Rules, dividers, on-dark accent — never text on cream
--gold-d	#a88858	Large decorative text on cream only
--gold-l	#e2c89a	Text on ink or maroon

Contrast — measured, 2026-08-25

Against --cream #faf7f2:

Colour	Ratio	AA body (4.5)	AA large (3.0)
--ink #1a1614	16.81	pass	pass
--ink-soft #3a322c	11.75	pass	pass
--maroon #5a1a1c	12.29	pass	pass
--maroon-l #7a2a2c	8.95	pass	pass
--muted #6e6359	5.47	pass	pass
--gold-d #a88858	3.11	FAIL	pass
--gold #c9a876	2.10	FAIL	FAIL

Against --maroon #5a1a1c: cream 12.29 · gold-l 8.11 · gold 5.84 — all pass. Against --ink #1a1614: cream 16.81 · gold-l 11.09 · gold 8.00 — all pass. --muted on ink measures 3.07 and fails; use --gold-l or cream at reduced opacity for secondary text on dark.

Hard rules.

1. --gold is never a text colour on cream. Rules, borders, dividers, icon strokes, and on-dark text only.
2. --gold-d on cream only at 24 px+ / 19 px bold, and only for decorative display text — never for anything a reader must parse.
3. Body text on cream is --ink or --ink-soft. Metadata may use --muted.
4. Secondary text on dark is --gold-l or --cream at ≥ 70% opacity.
5. No dark mode. A single committed light identity is the right call for a legal practice, and halving the surface area halves the ways contrast breaks.

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Typography

Faces. Instrument Serif (display) · Geist 300/400/500/600 (text) · Geist Mono 400/500 (eyebrows, labels, data).

Self-host all three. Subset to Latin + Latin Extended-A. font-display: swap. Preload only the two faces used above the fold — Instrument Serif regular and Geist 400.

Scale. Fluid, clamp(), 1.25 ratio at the small end widening to 1.333 at the display end. Tokens --text-xs through --text-6xl in tokens.css.

Rules.

• Display type (--font-serif) at --text-4xl and above only. It has almost no hinting at small sizes and looks weak below 32 px.
• Display line-height 0.95–1.05; letter-spacing -0.02em.
• Body line-height 1.6. Measure capped at 68ch — the old site ran full-bleed paragraphs at 1400 px, which is unreadable.
• Eyebrows: mono, 11–12 px, 0.18em tracking, uppercase, always paired with a real heading. An eyebrow is not a heading and never carries the <h*>.
• Italic display (.it) is the one flourish the design allows. One italic phrase per headline, at most.
• Never skip a heading level. <h1> once per page.

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Spacing and layout

8 px base: --space-1 4px · -2 8 · -3 12 · -4 16 · -5 24 · -6 32 · -7 48 · -8 64 · -9 96 · -10 128 · -11 160.

Content width 1280px; prose measure 68ch; wide media 1440px. Gutters: 24px mobile, 48px desktop. Section rhythm: --space-9 (96 px) mobile, --space-11 (160 px) desktop — --section-y in tokens.css. Corrected 2026-08-26: the curve was 6vw + 2rem, which reaches 160 px only at a 2133 px viewport, so the desktop half of this line was never delivered (measured 108.8 px at 1280 px, 128 px at 1600 px). It is now 9vw + 1rem, which reaches 160 px at 1600 px. If you change the curve, re-measure — a clamp() whose upper bound is unreachable reads exactly like one that works.

Grid: 12 columns desktop, 6 tablet, 4 mobile, --space-5 gutter.

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Motion

The old build animated nearly everything on scroll. The replacement is deliberate and quiet.

• Reveal on section entry only — not on every child element. Sub-element stagger is limited to card grids, and capped at six children.
• Duration 600ms, easing cubic-bezier(.2,.7,.2,1). Transform and opacity only — never layout properties.
• Implement with animation-timeline: view(), behind @supports. Amended 2026-08-26: the IntersectionObserver alternative this line used to offer first is now ruled out, not merely second choice. It has to run inline in <head> to avoid a flash, and 05-backend-spec.md specifies script-src 'self' with no unsafe-inline — so the only script on the site would have been the one thing the site's own CSP refuses to execute, and a per-build hash drifts from the policy pinning it. The CSS route ships zero JavaScript. Not a framework, not a library, not a script.
• Content is visible without the feature. The @supports gate is load-bearing, not defensive: without it, a browser that ignores animation-timeline runs the animation once against the document timeline at load; with it, that browser gets no animation and fully visible content. The old build had this exactly backwards and shipped a blank page.
• And without a print timeline. A scroll-driven animation has no timeline when printing, so a revealed element renders at its from state — opacity: 0. Measured 2026-08-26: before the print override existed, printing a page to PDF dropped four card headings from the output entirely. /about/ is written to be printed by people evaluating an appointment.
• Hover transitions 250ms.

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

Nothing animates infinitely. Nothing autoplays. Nothing moves on page load except the reveal of the hero.

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Components

Component	Notes
InfinityMark	⚠️ Currently a raster — a documented, temporary exception to this rule (AGENTS.md Q38, R13). The mark is gradient-mesh artwork rather than flat vector paths. An SVG is held and it renders faithfully — and it renders faithfully because it IS the raster: 257,278 bytes wrapping seven embedded base64 PNGs, against 3,063 B for the AVIF a Retina browser takes in the header — 84×. Figures re-stated 2026-08-27 because a second, larger call site now exists and the single number had become misleading: the mark ships at two intrinsic widths, 64 px (header, footer) and 232 px (the home page's approach section, which renders at 225.5 px). At 232 px a DPR-2 device takes 14,555 B and DPR-3 22,639 B, so the ratio against the SVG there is ~11×, not 84×. The full ladders are in docs/reference/brand-assets.md; do not quote one number as if it covered both. Inlining it would breach CLAUDE.md's no-base64-images rule. Pouya settled the characterisation on 2026-08-27: a first draft called the file "a raster in a vector wrapper", a later draft withdrew that as unfair, and the withdrawal went too far. Both halves are true — the fidelity is real, and it is bought with embedded raster, which is exactly why fidelity was never the question. The exception is about payload and composition. It renders AVIF/WebP with a PNG fallback; a Retina device takes 3,063 B of AVIF, alt="" when decorative, aspect ratio pinned to 667 / 426. Restore this rule the moment the commissioned vector master lands. Until then the rule stands unchanged for every other mark or icon: inline SVG, currentColor, aria-hidden when decorative, never a PNG
SiteHeader	Sticky from 66 rem (1056 px) up; static below it. Practice dropdown as CSS-only <details>. (a) The one-row header holds the brand, seven nav items and the CTA — Insights is the seventh, arriving on its own at build step 7. Binary search on the built page puts the true fit at 1047 px; 66 rem is the clean token above it. Below 66 rem the nav takes its own row and the header measures 141 px at tablet widths and 189 px at 320–375 px. (b) "Condenses on scroll" is a hairline rule and a shadow, not a size change — a position: sticky header stays in normal flow, so shrinking its padding lifts every page below it, against the CLS < 0.05 budget. Longhands only; see the component on what the minifier does to the animation shorthand. (This row has been wrong twice, instructively. It first said 60 rem / "~115 px", a height the header never took. It then said 64 rem "with 32 px of clearance" — that 32 px was .header-inner's own column-gap mistaken for slack; the real figure at 1024 px with seven items was −21.6 px, and nothing overflowed only because flexbox crushed the logo inside the brand block. Measure slack, not gaps.)
SiteFooter	Three-column sitemap, contact block, designations, entity line
Eyebrow	Mono label with optional maroon dot
SectionHeading	Eyebrow + display heading + optional lede, one measure
Button	Variants primary (maroon) · ghost (outlined) · gold (ink bg, gold-l text). Renders <a> or <button> correctly
Pill	Small bordered label for designations and sector chips
CredentialRow	Three or four credential slots. Never matter counts — AGENTS.md §4
PracticeCard	Sector chip, heading, one paragraph, arrow link
ProcessStep	Numbered step, timing, body
ArticleCard	Title, description, date, topic pills, reading time
Prose	Long-form wrapper. Owns all typographic defaults for MDX
SEO	Title, description, canonical, OG, Twitter, JSON-LD — see 04-seo-spec.md

Focus states. Every interactive element gets a visible focus ring: outline: 2px solid var(--maroon); outline-offset: 3px. Use :focus-visible. Never outline: none without a replacement — the old build removed it globally.

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Accessibility floor

Not a polish pass. A build requirement.

• One <h1> per page; heading levels never skipped.

• Landmarks: <header>, <nav>, <main>, <footer>. Skip-to-content link first in tab order.

• Every image has alt. Decorative images get alt="".

• Colour never carries meaning alone.

• All functionality reachable by keyboard; focus order matches visual order.

• Forms: real <label> elements, aria-describedby for hints, errors announced with role="alert" and tied to their field.

• Touch targets ≥ 44 × 44 px.

• Test at 200% zoom and at 320 px width. Both measured 2026-08-27 on /: document overflow 0 at 320, 360, 390, 414, 640, 768, 900, 1024, 1056, 1200, 1216, 1280, 1440 and 1920 CSS px, with zero elements extending past the viewport. Page zoom at 200% of 1280 is the 640 column and at 400% is the 320 column, so WCAG 1.4.4 and 1.4.10 are both covered by that sweep.

  A stricter case is not fully clean, and it is recorded rather than left to be discovered. With the reader's default font size at 200% — root at 32 px, a real accessibility setting and not page zoom — / measured 234 px of overflow at 390. Brought down in three measured steps:

  Fix	390 px	320 px
  as first built	234 px	304 px
  minmax(min(Nrem, 100%), 1fr) on three grids	83 px	153 px
  .credentials made explicit repeat(2, minmax(0, 1fr)); .feature padding clamped and overflow-wrap: anywhere on its title; .contact-action flex: 0 1 auto + min-inline-size: 0	3 px	65 px

  Two things worth keeping. overflow-wrap: break-word permits a break at layout time but does not reduce min-content size — anywhere does, and that distinction was the whole of one of those fixes. And 1280 px stays 602 px over, from the header's deliberate flex-wrap: nowrap above 66 rem plus white-space: nowrap on the brand name; the 320 px residual is the same header plus the display headline's 104 px floor. Undoing either re-opens the measured step-1 header decision, so they stand. All of this is beyond what this floor requires — page zoom is clean — so it is a robustness margin rather than a failure. Revisit if a real reader hits it.

• Measure the elements, not only the page. A document-level overflow check passes while a flex child absorbs the deficit by being crushed — that is how step 1 shipped a logo at aspect 0.891 under a green "0 overflow at every width". Assert the rendered geometry of the thing you care about. On / every infinity-mark instance measures 1.5654–1.5657 against the master's 1.5657.

• A touch-target measurement of the wrong box is not a finding. The eight cards on / report 26–39 px-tall <a> elements and are fine: each card's whole box is the link's hit area via ::after { inset: 0 }, verified by hit-testing nine points per card at three widths (24 cards, 9/9). Hit-test before enlarging anything. WCAG 2.5.8's inline exception also applies to a link sitting mid-sentence, and one such link on / is deliberately left at 164 x 21.

• Every page must be readable and navigable with JavaScript disabled.