distill-design

name	distill-design
description	Distill a DESIGN.md from a website — crawl and analyze a site's rendered design (colors, typography, spacing, components, signature motifs) and produce a brand-accurate DESIGN.md design-system spec. On request, also generate a token-preview page (preview.html) or a realistic website demo (demo.html). Use when the user gives a URL and asks to "make/generate a DESIGN.md", "extract this site's design system", "capture a brand's visual language", or "turn this website into design tokens".
user-invocable	true
allowed-tools	["Read","Write","Edit","WebFetch","Bash"]

/distill-design — Distill a DESIGN.md from a website

Turn a live website into a DESIGN.md: a plain-text design-system spec (YAML token frontmatter + 11 prose sections) that any AI agent can read to generate on-brand UI. Concept and format follow VoltAgent/awesome-design-md.

Argument: a website URL ($ARGUMENTS). If none was given, ask for one.

What gets produced: by default, only DESIGN.md. The visual preview.html and the realistic demo.html are opt-in — generate them only when the user asks (see the two "on request" sections below).

Read these first

• reference/format-spec.md — the exact frontmatter schema and 11-section body.
• reference/extraction-guide.md — how to measure tokens off a live site.
• reference/template.md — the DESIGN.md skeleton you fill in.
• reference/preview-template.html — the canonical, data-driven preview.html. Copy it verbatim and inject only the token JSON (see "Generate the token preview").
• reference/demo-guide.md — how to build the realistic demo (only when asked). (These ship next to this SKILL.md, so read them as siblings.) The preview.html shell is the same for every brand — use the template above, never hand-write it. For a bespoke demo.html, the sample folders examples/stripe, examples/linear, examples/spotify in the source repo (ake77-code/distill-design) are references.

Where to write output

By default, write into the current project (not this skill's own folder):

• A single spec → ./DESIGN.md (project root). An optional preview.html / demo.html go alongside it only when requested.
• Several specs → use a distill-design/<brand>/ folder per brand.
• Always honor an explicit path the user gives.

Workflow

1. Scope the target

Confirm the URL. Identify a few page types worth inspecting beyond the homepage: marketing, pricing, docs, and the app/dashboard if reachable. Brands often flip polarity (light marketing → dark app) — plan to capture both.

2. Inspect & measure

Prefer measured values over guesses. Drive a real headless browser and read getComputedStyle — try these in strict order, stop at the first that works (full snippets in extraction-guide.md):

1. Playwright (preferred) — script Chromium via Bash; install with npx -y playwright install chromium (or bunx playwright install chromium) if missing, then page.$eval(sel, …) to read exact hex, font stacks, radii, padding, shadows. Screenshot too. (npx and bunx are interchangeable throughout.)
2. Puppeteer (fallback) — same approach via require("puppeteer") if Playwright is unavailable; install with npx -y puppeteer browsers install chrome (or the bunx equivalent).
3. Browser MCP (Chrome / Preview) — only if one is already connected.
4. WebFetch / fetch (LAST RESORT) — text only, no pixel values. Use ONLY when no browser can run; combine with brand knowledge and label the output an inspired interpretation in the Colors note and ## Known Gaps.

Sweep heros, body text, buttons, cards, nav, inputs, and footer. Pull colors → roles, the type scale, radius scale, spacing base unit, elevation, per-component specs and states, and the 2–3 signature motifs.

3. Map to tokens — go DEEP

The most common failure is a too-thin file. Real brands have many tokens; match that depth (see format-spec.md for the targets):

• Colors ~18–30+, named by role, kept FLAT. Carry polarity inside colors: with *-on-dark text variants and surface-dark-* tiles; tier muted inks by approximate opacity in the name (ink-muted-64). Only dedupe same-role hexes within ~2%.
• Typography ~12–20 SEMANTIC roles (hero-display, lead, tagline, body-strong, dense-link, caption-strong, button-large, fine-print, micro-legal, nav-link), each with weight, line-height, letterSpacing in px, and fontFeature only when real. Capture rare weights (300 / 600-vs-700).
• rounded with none:0 + full; spacing with measured oddities (17px) and a section step. Use measured values, not idealized 4/8/12.
• Components ~15–30+, each a {group.token} composition (literal padding/height/ size allowed). Variants are SEPARATE keys (-active, -focus, -selected, -2). Never document hover.
• Choose an open-source substitute for any proprietary font.

4. Write DESIGN.md

Fill reference/template.md into the output path (default ./DESIGN.md — see "Where to write output"). Follow the 11-section structure and the prose tone of the bundled samples. name: is <Brand>-design-analysis. The frontmatter description is the most important field — one dense paragraph on a single line (plain scalar, not a > block) vivid enough to picture the site with eyes closed.

5. Self-check the DESIGN.md

• Frontmatter is valid YAML; run a quick parse if unsure (see verification below).
• Every {group.token} in the body resolves to a defined frontmatter key.
• All 11 sections present and non-empty (Overview → Known Gaps), including the required ## Known Gaps.
• Depth targets met (~18+ colors, ~12+ type roles, ~15+ components). description is inline. No -hover component keys (brief prose hover is fine). letterSpacing in px.
• Colors are role-named and deduped; proprietary fonts have a substitute.

6. Offer the visualizations (always end with this)

The DESIGN.md is the deliverable. Do not auto-generate preview.html or demo.html. End your reply by reminding the user they can opt into either, e.g.:

已生成 DESIGN.md。需要的话我还能基于它生成: ① preview.html —— 设计系统可视化(色板 / 字阶 / 组件,带顶部导航与明暗切换); ② demo.html —— 像真实网站的 Web 落地页或移动端界面。 两者都按需生成,要哪个告诉我。

(Match the user's language.) Generate preview.html only if asked → follow "Generate the token preview" below. Generate demo.html only if asked → follow "Generate a realistic demo" below.

Generate the token preview preview.html (on request)

Do NOT hand-write per-brand HTML/CSS. The preview shell is identical for every website — only the injected data changes. The skill ships one canonical, data-driven template: reference/preview-template.html — a polished design-system showcase page: a sticky nav (the brand wordmark + a distill-design GitHub chip that links to github.com/ake77-code/distill-design + section anchors + light/dark toggle + a CTA), a two-column hero (Design System Analysis of <displayName> + the description + a device-mock card), then numbered sections ("01 — Color Palette", "02 — Typography Scale", "03 — Components", "04 — Spacing & Radius", "05 — Elevation & Depth", "06 — Responsive Behavior") rendering grouped swatch cards, a type ladder, a component gallery, spacing/radius blocks, and a breakpoints table. No footer. Zero dependencies (system fonts, no CDN).

To generate a brand's preview.html:

1. Copy reference/preview-template.html verbatim to <output>/preview.html.
2. Replace ONLY the JSON inside <script type="application/json" id="design-data"> with the brand's tokens, derived from the DESIGN.md. Change nothing else — the shell, CSS, and renderer stay byte-identical across brands.

The injected JSON schema (see the comment above that block in the template):

• meta: { name, displayName, description, source, nativeTheme: "light"|"dark", navCta, heroCtas, sections? }. name is the real brand; the hero reads "Design System Analysis of displayName" — set displayName to the real brand name (e.g. "Apple", "Stripe", "Figma"). Do NOT invent fictional product names — use the actual brand the URL belongs to. description is the frontmatter description verbatim; source is the live URL; nativeTheme is the brand's polarity (dark for Linear etc.). Optional navCta (nav button label, e.g. "Buy" / "Get started") and heroCtas ["Learn more","Buy"] set the brand's CTA wording. Optional heroArt picks the hero visual to match the signature motif: device (default product mock), mesh (gradient-mesh fill — Stripe-like brands), or glow (dark glow — Linear-like brands). Optional sections = { colors:{heading,intro}, typography:{...}, components:{...} } gives each section a brand-voiced heading/intro (e.g. "One blue. Three near-blacks.") pulled from the matching DESIGN.md body sections; omit for defaults.
• colors: the flat palette as role→hex (rgba strings ok). Every role renders as a swatch, auto-grouped (Brand & Accent / Surface / Text / Hairlines & Borders / Semantic).
• colorRoles (optional, recommended): { role: "one-line description" } — the per-color usage note from the DESIGN.md Colors section; shows as the swatch's 3rd line so cards match the reference depth. colorNames (optional): { role: "Friendly Name" } → renders as "role (Friendly Name)".
• colorsDark: optional opposite-polarity overrides (else dark is synthesized).
• typography: role→{ fontFamily, fontSize, fontWeight, lineHeight, letterSpacing }.
• rounded, spacing: token→value maps.
• components: role→{ backgroundColor, textColor, typography, rounded, padding, border, height, size }; values may use {group.token} refs (resolved by the renderer) so each gallery sample renders in the real component style.
• responsive (optional): { breakpoints:[{name,width,changes}], touchTargets, collapsing, imageBehavior } from the DESIGN.md Responsive Behavior section — drives "06 — Responsive Behavior". Omit the whole key to hide the section.

The template already provides the nav, hero, numbered sections, swatch grouping, type ladder, component gallery, spacing/radius/elevation blocks, a responsive breakpoints table, and the light/dark toggle (localStorage). The nav wordmark shows the brand name (not a third-party brand); the GitHub chip reads distill-design and points at github.com/ake77-code/distill-design. After injecting the data, verify it opens standalone (file://) and visually reads as a polished design-system analysis page in the brand's colors. For pixel-level reference, the awesome-design-md project renders each brand at getdesign.md/design-md/<brand>/preview.html.

Generate a realistic demo demo.html (on request)

Goal: a single .html file with zero external dependencies (all CSS/JS inline, no CDN, no network requests — system/-apple-system font stacks only) that reads like a real product, not a token catalog. It is distinct from preview.html: preview.html documents the system; the demo uses it to ship a believable page.

Read reference/demo-guide.md for the full recipe. In short:

1. Ask form factor if unclear: Web (responsive landing page) or Mobile (a phone-framed app screen). Default to Web.
2. Build a real page from the tokens — pull every color, font, radius, spacing, shadow and component straight from the DESIGN.md:
   • Web: sticky nav → hero (headline + sub + primary/secondary CTA) → social-proof logos → 3-up feature cards → pricing tiers → testimonial → CTA band → footer.
   • Mobile: a phone frame (status bar, notch) wrapping a real app screen — top bar, content list/feed/cards, and a bottom tab bar or now-playing/sticky CTA.
3. Make it feel real — plausible copy and product name, the brand's signature motif (e.g. gradient mesh, glow hairlines, green play button), realistic imagery via inline SVG/CSS gradients (never hot-link external images), and tasteful hover/scroll micro-interactions in a tiny inline <script>.
4. Save next to the spec as demo.html (or demo-mobile.html).
5. Verify it opens standalone (double-click / file://) with no console errors and visibly resembles a real site in the brand's language.

Verify

# YAML frontmatter parses (frontmatter is between the first two '---' lines)
python3 - "$f" <<'PY'
import sys, yaml
t = open(sys.argv[1]).read().split('---', 2)
yaml.safe_load(t[1]); print("frontmatter OK")
PY

Then grep the spec for the two most common slips — both must return nothing:

grep -nE '^\s+[a-z0-9-]*-hover:' "$f"   # no hover-STATE component keys (prose ok)
grep -c '^## ' "$f"                     # must be 11 (Overview … Known Gaps)

If you generated a preview.html or demo.html, open it in a browser — or screenshot it with a browser MCP — and confirm it renders in the brand's language.

Notes

• Keep folder names lowercase, URL-safe (stripe, together.ai).
• name: is <Brand>-design-analysis. When values are interpreted (WebFetch-only, no measured CSS) rather than officially sanctioned, say so in the Colors source-pages note and the ## Known Gaps section — don't fabricate precision.
• One brand per folder; document state variants as separate component keys; never hover.