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skills/web-prototype/SKILL.md

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+---
+name: web-prototype
+description: |
+  General-purpose desktop web prototype. Single self-contained HTML file built
+  by copying the seed `assets/template.html` and pasting section layouts from
+  `references/layouts.md`. Default for any landing / marketing / docs / SaaS
+  page when no more specific skill matches.
+triggers:
+  - "prototype"
+  - "mockup"
+  - "landing"
+  - "single page"
+  - "marketing page"
+  - "homepage"
+od:
+  mode: prototype
+  platform: desktop
+  scenario: design
+  preview:
+    type: html
+    entry: index.html
+  design_system:
+    requires: true
+    sections: [color, typography, layout, components]
+---
+
+# Web Prototype Skill
+
+Produce a single, self-contained HTML prototype using the bundled seed and layout library — **not** by writing CSS from scratch. The seed already encodes good defaults (typography, spacing, accent budget). Your job is to compose it.
+
+## Resource map
+
+```
+web-prototype/
+├── SKILL.md                ← you're reading this
+├── assets/
+│   └── template.html       ← seed: tokens + class system + chrome (READ FIRST)
+└── references/
+    ├── layouts.md          ← 8 paste-ready section skeletons
+    └── checklist.md        ← P0/P1/P2 self-review
+```
+
+## Workflow
+
+### Step 0 — Pre-flight (do this once before writing anything)
+
+1. **Read `assets/template.html` end-to-end** — at minimum through the `<style>` block. The class inventory at the top of `references/layouts.md` lists every class that must be defined there; if one is missing, add it to `<style>` rather than re-defining it inline on every section.
+2. **Read `references/layouts.md`** so you know which section skeletons exist. Don't write a section type that isn't covered — pick the closest layout and adapt.
+3. **Read the active DESIGN.md** (already injected into your system prompt). Map its colors to the six `:root` variables in the seed; don't introduce new tokens.
+
+### Step 1 — Copy the seed
+
+Copy `assets/template.html` to the project root as `index.html`. Replace the six `:root` variables with the active design system's tokens. Replace the page `<title>` and the topnav brand.
+
+### Step 2 — Plan the section list
+
+**Pick layouts before writing copy.** Default rhythms (from `layouts.md`):
+
+| Page kind | Default rhythm |
+|---|---|
+| Landing | 1 hero → 3 features → 4 stats *or* 5 quote → custom split → 6 cta |
+| Marketing / editorial | 1 hero-center → 7 log list → 6 cta |
+| Pricing | 1 hero-center → 8 comparison table → 6 cta |
+| Docs index | 1 hero-center → 7 log list (sections of docs) → 6 cta |
+
+State the chosen list in one sentence to the user *before* writing — they can redirect cheaply now and not after 200 lines of HTML.
+
+### Step 3 — Paste and fill
+
+For each chosen layout, copy the `<section>` block from `layouts.md` into `<main id="content">` of your `index.html`. Replace bracketed `[REPLACE]` strings with real, specific copy from the user's brief. **No filler** — if a slot is empty, the section is the wrong choice; pick a different layout.
+
+### Step 4 — Self-check
+
+Run through `references/checklist.md` top to bottom. Every P0 item must pass before you move on. P1 items should pass; P2 are bonus.
+
+### Step 5 — Emit the artifact
+
+Wrap `index.html` in `<artifact>` tags. One sentence before describing what's there. Stop after `</artifact>`.
+
+## Hard rules (the seed protects most of these — don't fight it)
+
+- **Single accent, used at most twice per screen.** Eyebrow + primary CTA is the default budget.
+- **Display font is serif** (Iowan Old Style / Charter / Georgia in the seed). Sans for body. Mono for numerics, captions, eyebrows.
+- **Image placeholders, not external URLs.** Use the `.ph-img` class — never link to a stock photo CDN.
+- **Mobile reflow already works** via the seed's media query at 920px. Don't break it by adding fixed widths.
+- **`data-od-id` on every `<section>`** so comment mode can target it.
+
+## Output contract
+
+```
+<artifact identifier="kebab-case-slug" type="text/html" title="Human Title">
+<!doctype html>
+<html>...</html>
+</artifact>
+```
+
+One sentence before the artifact. Nothing after.