--- version: alpha name: claude.com description: "Light product system built on #faf9f5 with #faf9f5 as the primary CTA accent. Type anchored in anthropicSerif at 72px / weight 330. Extracted automatically from https://claude.com/ — rendered styles via getComputedStyle() + CSS custom properties (token-only values may not be painted)." narrative: | claude.com is built on a warm, off-white canvas (rgb(250, 249, 245)). The system uses rgb(250, 249, 245) as a near-neutral accent (low saturation). Sharp 0px corners on CTAs — architectural restraint, engineering precision alongside editorial serif type (anthropicSerif) — voice of authority. A layered elevation system (6 distinct shadows) building a clear front-to-back hierarchy. Motion is a first-class concern — 19 keyframe animations plus transition-driven interactions. colors: background: "#faf9f5" surface-1: "#ffffff" surface-2: "#f0eee6" ink: "#141413" ink-muted: "rgba(20, 20, 19, 0.65)" ink-subtle: "#30302e" primary: "#faf9f5" on-primary: "#111111" primary-hover: "#141413" hairline: "#30302e" primary-focus: "#2e2e2c" semantic-error: "#bf4d43" typography: display-xl: fontFamily: "anthropicSerif, Georgia, 'Times New Roman', serif" fontSize: 72px fontWeight: 330 lineHeight: 1.1 letterSpacing: 0 display-md: fontFamily: "anthropicSerif, Georgia, 'Times New Roman', serif" fontSize: 30px fontWeight: 400 lineHeight: 1.2 letterSpacing: 0 body: fontFamily: "anthropicSans, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif" fontSize: 12px fontWeight: 400 lineHeight: 1.4 letterSpacing: 0 button: fontFamily: "anthropicSans, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif" fontSize: 17px fontWeight: 600 lineHeight: 1.15 letterSpacing: 0 mono: fontFamily: "anthropicSans, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif" fontSize: 12px fontWeight: 400 lineHeight: 1.4 letterSpacing: 0 rounded: none: 0px xs: 4px sm: 8px md: 12px lg: 16px xl: 32px pill: 9999px spacing: xxs: 2px xs: 16px sm: 24px md: 32px lg: 56px xl: 64px xxl: 80px components: button-ghost: backgroundColor: "transparent" textColor: "{colors.hairline}" typography: "{typography.button}" rounded: "{rounded.none}" padding: 8px 0px button-light--invert: backgroundColor: "{colors.primary}" textColor: "#5e5d59" typography: "{typography.button}" rounded: "{rounded.sm}" padding: 8px 12px button-dark--solid: backgroundColor: "{colors.primary-hover}" textColor: "{colors.primary}" typography: "{typography.button}" rounded: "{rounded.sm}" padding: 8px 12px input-text-input: backgroundColor: "transparent" textColor: "{colors.primary}" typography: "{typography.mono}" rounded: "{rounded.none}" padding: 4px 0px status-badge-neutral-light: backgroundColor: "{colors.surface-1}" textColor: "{colors.primary-hover}" typography: "{typography.button}" rounded: "{rounded.sm}" tab-pill-tab: backgroundColor: "{colors.surface-2}" textColor: "{colors.primary-hover}" typography: "{typography.button}" rounded: "{rounded.md}" padding: 4px extracted_at: "2026-06-11T05:00:08.013Z" completeness: 86 scoreVersion: "v2" --- # Design System — claude.com > Extracted automatically by Prism from https://claude.com > Date: 2026-06-11 > Viewport: Desktop 1440x900 + Mobile 390x844 > Values are extracted, not hand-written: rendered styles via getComputedStyle() + colors declared in CSS custom properties (token-only values are marked `(token)` and may not be painted). ## 0. Design DNA **Density**: sparse  |  **Motion**: expressive  |  **Weight**: medium  |  **Aesthetic**: editorial-minimal | Dimension | Value | Signal | |---|---|---| | Canvas | neutral | `#faf9f5` | | Type posture | serif-led (anthropicSerif) | "Think fast,build faster" | | Color assertion | dual-accent | #faf9f5 | | Whitespace | sparse | section rhythm 72px | | Interaction | expressive | 19 keyframes, 22 transitions | | Radius language | 8px-rounded | from token scale | **Prism fingerprint**: `neutral-canvas · serif-display · dual-accent · 8px-rounded · expressive-motion` > **🤖 TL;DR for AI agents** (read this first — saves you scanning the full doc): > > - **Canvas**: `rgb(250, 249, 245)` is the page background. Every component composits against this. > - **Accent**: `rgb(250, 249, 245)` for primary CTAs ONLY. Never decorative. > - **Body type**: 16px (token: `typography.body`). Default for ALL text not in a heading role. > - **Section rhythm**: 72px between major bands. Card padding: 56px. > - **Default radius**: 8px on buttons/inputs. Pills (`9999px`) only for icon-buttons or status chips. > > **Before generating UI**: import this DESIGN.md, scan §2 (Color Palette) + §4 (Components) + §10 (Agent Guide). Skip §11–12 unless extending. ## 1. Visual Theme & Atmosphere claude.com's canvas is a warm, intentionally-tinted surface (`#faf9f5`) — a refusal of the default white that immediately signals editorial intent. This isn't sterility, it's an invitation to read. Headlines are set in **anthropicSerif**, a serif display face (the dominant type signature, e.g. "Think fast,build faster" at 72px). A second display voice — **anthropicSans** (sans) — appears in lower bands (e.g. "Brainstorm in chat, build in Cowork"), used for editorial accent. Body text is set in **anthropicSans** with OpenType utility features (`"liga", "lnum", "pnum"`) for data-dense contexts. The weight scale rejects the standard 100/200/.../900 ladder in favor of custom values (max **700** in this system) — a deliberate signal that this design system is precisely tuned, not assembled from defaults. Body text reads in Near-Black (`#141413`) — softened from pure black, a small but deliberate detail that lowers reading friction. **Off-White** (`#faf9f5`) provides interactive distinction without visual aggression. Elevation is built from multi-layer shadow stacks (6 distinct) — each combines several blurred layers at varying offsets to build a clear front-to-back hierarchy. Motion design uses smooth easing curves for polished state transitions. The site uses a variable font with OPSZ axes, enabling precise weight/width control across the type hierarchy. **Key Characteristics:** - Background: Off-White (`#faf9f5`) - Primary typeface: anthropicSans - Primary text: Near-Black (`#141413`) - Accent: Off-White (`#faf9f5`) - Display: 72px weight 330 - Shadow system: 6 distinct elevation levels - Custom fonts loaded: anthropicSans, anthropicSans Fallback, anthropicSerif, anthropicSerif Fallback, anthropicMono, anthropicMono Fallback ## 2. Color Palette & Roles ### Background & Surface - **Off-White** (`#faf9f5`): Page background (primary) - **Pure White** (`#ffffff`): Surface / elevated background - **Beige** (`#e8e6dc`): Surface / elevated background - **Whitesmoke** (`#f0eee6`): Surface / elevated background ### Text & Content - **Near-Black** (`#141413`): Primary body text - **Pure Black** (`#000000`): Secondary text - **Charcoal** (`#30302e`): Secondary text - **Near-Black** (`#262624`): Secondary text - **Charcoal** (`#3d3d3a`): Secondary text ### Accent & Interactive - **Focus** (`#2c84db`): Interactive / accent - **Clay** (`#d97757`): Interactive / accent - **Ring Blue** (`#4285f4`): Interactive / accent - **Success Green** (`#34a853`): Interactive / accent - **Amber** (`#fbbc05`): Interactive / accent - **Vermillion** (`#ea4335`): Interactive / accent - **Terracotta** (`#c6613f`): Interactive / accent ### Border & Divider - **Silver** (`#d1cfc5`): Borders / dividers ### Full Extracted Palette **21 colors rendered on the page** + **16** more declared in design tokens (CSS custom properties — not necessarily painted). (17 categorized above + 20 additional below.) Rendered values are read via `getComputedStyle()`; token values come from CSS variable declarations. Third-party logo colors are filtered out. - `#5e5d59` — Slate Grey - `#4d4c48` — Charcoal - `#87867f` — Slate Grey - `#b0aea5` — Cool Gray - `#ebcece` — Coral *(token)* - `#73726c` — Slate Grey *(token)* - `#e3dacc` — Oat *(token)* - `#f5f4ed` — Off-White *(token)* - `#9c9a92` — Grey *(token)* - `#bcd1ca` — Cactus *(token)* - `#c46849` — Terracotta *(token)* - `#6a9bcc` — Sky *(token)* - `#c46686` — Fig *(token)* - `#c2c0b6` — Silver *(token)* - `#1a1918` — Near-Black *(token)* - `#bf4d43` — Error *(token)* - `#1f1e1d` — Near-Black *(token)* - `#cbcadb` — Heather *(token)* - `#dedcd1` — #dedcd1 *(token)* - `#788c5d` — Olive *(token)* ### CSS Custom Properties (Design Tokens) **Spacing Token** - `--gap-md`: `32px` - `--gap-sm`: `24px` - `--gap-xs`: `16px` - `--section-spacing-md`: `96px` **Font Weight Token** - `--font-weight-bold`: `700` - `--font-weight-light`: `300` - `--font-weight-regular`: `400` - `--theme-button-secondary-font-weight`: `500` **Error / Destructive** - `--color-error`: `#bf4d43` **Motion Token** - `--reveal-duration`: `1s` **Other tokens** - `--text-width-wide`: `70ch` - `--theme-checkbox-bg-selected`: `#000` - `--color-coral`: `#ebcece` - `--color-gray-300`: `#d1cfc5` - `--color-gray-550`: `#73726c` - `--color-clay-hover`: `#c6613f` - `--theme-background-primary`: `#faf9f5` - `--color-gray-500`: `#87867f` ## 3. Typography Rules ### Font Families - **Primary**: `anthropicSans` - **Secondary**: `anthropicSerif` - **Font 3**: `anthropicSans Fallback` - **Font 4**: `anthropicSerif Fallback` - **Font 5**: `anthropicMono` ### Custom Fonts Loaded - **anthropicSans** weight normal (normal) - **anthropicSans Fallback** weight normal (normal) - **anthropicSerif** weight normal (normal) - **anthropicSerif Fallback** weight normal (normal) - **anthropicMono** weight normal (normal) - **anthropicMono Fallback** weight normal (normal) ### Typography Hierarchy | Role | Font | Size | Weight | Line Height | Letter Spacing | Notes | |------|------|------|--------|-------------|----------------|-------| | Display Hero | anthropicSerif | 72px | 330 | 1.1 | normal | Main headline (h1) | | Sub-heading | anthropicSerif | 30px | 400 | 1.2 | normal | Third-level heading (h3) | | Button Large | anthropicSans | 17px | 600 | 1.15 | normal | Button label (17px) | | Card Title | anthropicSans | 15px | 400 | 1.5 | normal | Card headings | | Input | anthropicSans | 12px | 400 | 1.4 | normal | Form input (12px) | ### Font Weight Scale CSS custom properties define 9 explicit weight steps: - `--font-weight-light`: `300` — Light - `--font-weight-regular`: `400` — Regular - `--theme-button-primary-font-weight`: `480` — Medium (custom, ~500) - `--theme-button-secondary-font-weight`: `500` — Medium - `--theme-button-clay-font-weight`: `500` — Medium - `--theme-button-tertiary-font-weight`: `500` — Medium - `--font-weight-medium`: `500` — Medium - `--font-weight-semibold`: `600` — SemiBold - `--font-weight-bold`: `700` — Bold ### Full Font Size Scale Sizes detected in the design (descending): `72px`, `52.00px`, `30px`, `24px`, `23px`, `19px`, `17px`, `16px`, `15px`, `14px`, `12px`, `11px` > 7 size(s) detected outside the sampled hierarchy (51.9978px, 24px, 23px, 19px, 16px, 14px, 11px). These appear on elements not in the sampled set — likely additional display sizes, marketing-section overrides, or third-party-widget styles. ### OpenType & Variable Font Features The typography uses these OpenType features intentionally — this is a sophisticated type system, not a default fallback: - **tabular figures** (`tnum`) — numbers align vertically, essential for pricing tables and dashboards - **lining figures** (`lnum`) — full-height numbers, more authoritative than old-style - **ligatures** — common letter pairs replaced with refined glyphs (fi, fl, etc.) **Clone instruction:** Enable these in your CSS: ```css body { font-feature-settings: "liga", "lnum", "pnum", "tnum"; } ``` **Variable font axes:** - OPSZ axis ## 4. Component Stylings ### Buttons **Ghost** - Background: `transparent` - Text: `#30302e` `{colors.hairline}` - Padding: 8px 0px - Radius: 0px - Font: 15px weight 400 - Use: Subtle action, toolbar, nav button - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` **Light / Invert** - Background: `#faf9f5` `{colors.primary}` - Text: `#5e5d59` - Padding: 8px 12px - Radius: 8px - Shadow: `rgb(209, 207, 197) 0px 0px 0px 1px` - Font: 15px weight 400 - Use: Bright CTA on dark sections - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` **Dark / Solid** - Background: `#141413` `{colors.primary-hover}` - Text: `#faf9f5` `{colors.primary}` - Padding: 8px 12px - Radius: 8px - Font: 15px weight 400 - Use: Solid dark CTA - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` **Light / Invert** - Background: `#faf9f5` `{colors.primary}` - Text: `#141413` `{colors.primary-hover}` - Padding: 0px 20px - Radius: 9.6px - Border: 1px solid rgb(209, 207, 197) - Font: 17px weight 600 - Use: Bright CTA on dark sections - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` **Ghost** - Background: `transparent` - Text: `#141413` `{colors.primary-hover}` - Padding: 0px 24px - Radius: 8px - Font: 14px weight 500 - Use: Subtle action, toolbar, nav button - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` **Dark / Solid** - Background: `#141413` `{colors.primary-hover}` - Text: `#faf9f5` `{colors.primary}` - Padding: 8px 16px - Radius: 8px - Font: 16px weight 500 - Use: Solid dark CTA - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` **Icon Button** - Background: `#c6613f` - Text: `#ffffff` `{colors.surface-1}` - Padding: 4px - Radius: 8px - Font: 12px weight 400 - Use: Toolbar/UI icons - Focus: color: `rgb(46, 46, 44)`, border: `0px none rgb(46, 46, 44)`, borderColor: `rgb(46, 46, 44)` ### Inputs & Forms **Text Input** - Background: `transparent` - Text: `#faf9f5` `{colors.primary}` - Padding: 4px 0px - Radius: 0px - Border: 0px none rgb(250, 249, 245) - Font: 12px weight 400 - Use: Text fields, search inputs ### Status Badges **Neutral Light** - Background: `#ffffff` `{colors.surface-1}` - Text: `#141413` `{colors.primary-hover}` - Padding: 0px - Radius: 8px - Font: 15px weight 400 - Use: Status indicator, label, pill ### Tabs **Pill Tab** - Background: `#f0eee6` `{colors.surface-2}` - Text: `#141413` `{colors.primary-hover}` - Padding: 4px - Radius: 12px - Font: 15px weight 400 - Use: Navigation tabs, filter tabs ## 4b. Component Behaviors (State Matrix) ### Interaction State Narrative - **Button**: - **focus:** text #30302e → #2e2e2c, border changes *State transitions extracted via Playwright simulation — exact values in the YAML matrix below.* ```yaml component-behaviors: button: default: bg: "rgba(0, 0, 0, 0)" fg: "rgb(48, 48, 46)" focus: bg: "transparent" fg: "rgb(46, 46, 44)" link: default: bg: "rgb(250, 249, 245)" fg: "rgb(20, 20, 19)" border: "2px solid rgb(44, 132, 219)" card: default: bg: "rgb(250, 249, 245)" fg: "rgb(20, 20, 19)" border: "1px solid rgb(209, 207, 197)" shadow: "rgba(0, 0, 0, 0.016) 0px 4px 24px 0px, rgba(0, 0, 0, 0.016) " navLink: default: bg: "rgba(0, 0, 0, 0)" fg: "rgb(20, 20, 19)" hover: bg: "transparent" fg: "inherit" tab: default: bg: "rgba(0, 0, 0, 0)" fg: "rgb(20, 20, 19)" footerLink: default: bg: "rgba(0, 0, 0, 0)" fg: "rgb(250, 249, 245)" hover: bg: "transparent" fg: "inherit" ``` **Agent usage**: Validate generated components against this matrix. If your output's `:hover` state changes properties not listed here, you are off-brand. ## 4c. Component Vocabulary (Closed System) *This brand uses ONLY the following component vocabulary. Introducing new variants without justification breaks the system's tonal coherence.* ### Buttons - **4 shape(s)** in this system: `Ghost`, `Light / Invert`, `Dark / Solid`, `Icon Button` - **DO NOT introduce new buttons variants** without justification ### Inputs & Forms - **1 shape(s)** in this system: `Text Input` - **DO NOT introduce new inputs & forms variants** without justification ### Status Badges - **1 shape(s)** in this system: `Neutral Light` - **DO NOT introduce new status badges variants** without justification ### Tabs - **1 shape(s)** in this system: `Pill Tab` - **DO NOT introduce new tabs variants** without justification ## 5. Layout Principles ### Layout Type **hero + sections** ### Grid Single column, centered content ### Max Width 1440px ### Spacing System Generous spacing — editorial breathing room | Token | Value | |-------|-------| | xxs | 2px | | xs | 16px | | sm | 24px | | md | 32px | | base | 48px | | lg | 56px | | xl | 64px | | 2xl | 72px | | 3xl | 80px | ### Border Radius Scale | Name | Value | Use | |------|-------|-----| | None | 0px | No rounding | | Xs | 4px | Tiny corners (badges, micro elements) | | Sm | 8px | Buttons, inputs, small elements | | Md | 12px | Cards, containers | | Lg | 16px | Large rounded elements, pill segments | | Xl | 32px | Category strips, featured containers | | Full | 9999px | Pills, avatars, circular elements | ### Shape Language | Component | Border Radius | |-----------|---------------| | Buttons | `0px` | | Inputs & Forms | `0px` | | Status Badges | `8px` | | Tabs | `12px` | | Page Body | `0px` | | Navigation | `0px` | | Primary Input | `0px` | **Shape Personality**: Moderate Rounding — Medium corners (4–12px). Modern SaaS standard, neither sharp nor pill. **Full Radius Spectrum**: 4px, 8px, 9.6px, 12px, 16px, 24px, 32px (from `allBorderRadii` scan) ## 5b. Spacing Rhythm Names **Measured section padding**: bands use ~96px internal vertical padding (up to 128px) — **very airy / premium**. (Distinct from the gap *between* sections above.) Reproduce this generous vertical breathing room; cramped spacing is the #1 tell of a cheap clone. *Named spacing tokens with explicit use cases. Use these names in YOUR code instead of raw pixels for consistency.* | Name | Value | Use case | |------|-------|----------| | **hero** | `80px` | Top/bottom of full-bleed hero sections | | **section** | `64px` | Between major bands (color change, content shift) | | **subsection** | `56px` | Within a section, between content groups | | **card** | `32px` | Card padding, list-item spacing | | **compact** | `24px` | Form fields, tight clusters, badge padding | | **micro** | `16px` | Icon-text gap, tag inner padding | **Agent rule**: NEVER hardcode raw pixel values for spacing in generated UI. Always reference these named tokens (`spacing-rhythm.section`, etc.). ## 5c. Widget & Structure Library Structural patterns extracted from the page DOM — these are the **blueprints** an agent should follow to reproduce the page architecture (not just CSS values). **6/8 structural patterns detected.** ### Hero Pattern - **Composition:** split-left-text — Split layout, text-left/media-right — heading + body in left column, image/illustration in right column. Common for product showcases. - **Viewport coverage:** full-viewport hero (≥70% screen height) - **Heading:** "Think fast,build faster" — 72px center-aligned - **Subheading:** "Brainstorm in chat, build in Cowork" - **Media:** present, positioned right - **CTAs:** 4 (primary: "Continue with Google") - **Clone instruction:** Reproduce the **split-left-text** layout. Use the heading font-size token at the documented size. Place media right of text. ### Navigation Pattern - **Position:** static (scrolls with page) - **Layout:** unknown — Layout not classified - **Height:** 88px - **Logo:** ✓ present - **Nav links:** 1 primary items - **CTAs in nav:** 0 (no buttons — links only) - **Clone instruction:** Build a static unknown navigation. Link-only — no button styling needed. ### Card Grid Pattern - **Card count:** 3 cards detected - **Columns (desktop):** 3-up grid - **Card dimensions:** 416×915px (aspect 0.45:1) - **Gap:** 32px between cards - **Content:** ✓ image + CTA - **Image position:** top - **Clone instruction:** Build a 3-column grid (desktop) with cards at ~0.45:1 aspect ratio. Each card has an image at the top. ### Pricing Table Pattern - **Tier count:** 3 pricing tiers - **Layout:** side-by-side (horizontal comparison) - **Columns (desktop):** 3-up - **Feature list:** ✓ (median ~25 feature points per tier) - **Clone instruction:** Build a 3-column side-by-side pricing comparison. ### FAQ Pattern - **Item count:** 3 questions - **Format:** accordion (expand/collapse) - **Layout:** single-column - **Avg question length:** 31 chars - **Clone instruction:** Build 3 expandable accordion items in a single-column layout. ### Footer Pattern - **Columns:** 1 - **Links:** 75 total - **Height:** 1043px - **Includes:** ✗ no newsletter | ✓ social icons | ✓ language switcher ✓ copyright - **Clone instruction:** Build a 1-column footer with ~75 links per column, social media links, and a copyright line. ## 6. Depth & Elevation | Level | Treatment | Use | |-------|-----------|-----| | Flat (Level 0) | No shadow | Page background, content blocks | | Layered (Level 1) |
`rgba(0, 0, 0, 0.1) 0px 4px 16px 0px` | Cards, elevated surfaces | | Layered (Level 2) |
`rgb(209, 207, 197) 0px 0px 0px 1px` | Cards, elevated surfaces | | Layered (Level 3) |
`rgba(0, 0, 0, 0.016) 0px 4px 24px 0px`,
`rgba(0, 0, 0, 0.016) 0px 4px 32px 0px`,
`rgba(0, 0, 0, 0.01) 0px 2px 64px 0px`,
`rgba(0, 0, 0, 0.01) 0px 16px 32px 0px` | Cards, elevated surfaces | | Focus (Level 4) | `color(srgb 0.85098 0.466667 0.341177 / 0.1) 0px 4px 20px 0px` | Active/focus states, hover elevation | **Shadow Philosophy**: Multi-layered shadow system creating natural, atmospheric depth. Each shadow level combines multiple layers for realistic elevation. ## 7. Motion & Interaction ### Easing System | CSS Variable | Curve | Semantic Name | |--------------|-------|---------------| | `--ease-in-out-quart` | `cubic-bezier(.77,0,.175,1)` | Ease Out — Decelerating | | `--ease-out-quart` | `cubic-bezier(.165,.84,.44,1)` | Custom Ease — Balanced | | `--ease-in-quart` | `cubic-bezier(.895,.03,.685,.22)` | Custom Ease — Balanced | | `--ease-in-out-expo` | `cubic-bezier(1,0,0,1)` | Expo In-Out — Mechanical Snap | | `--ease-in-out-power3` | `cubic-bezier(.645,.045,.355,1)` | Ease Out — Decelerating | | `--ease-out-power2` | `cubic-bezier(.25,1,.5,1)` | Custom Ease — Balanced | ### Duration Scale | CSS Variable | Value | Tier | |--------------|-------|------| | `--reveal-duration` | `1s` | Cinematic | ### Copy-Paste Transition Snippets **Opacity** ```css transition: opacity 0.4s ease-in; ``` **Transform** ```css transition: transform 0.3s cubic-bezier(0.165, 0.84, 0.44, 1); ``` **Opacity** ```css transition: opacity 0.2s, transform 0.2s, visibility 0.2s; ``` **Background** ```css transition: background-color 0.15s, color 0.2s; ``` ### Keyframe Animation Catalog | Animation Name | Type | Animated Props | Use Hint | |----------------|------|----------------|----------| | `NavMobile-module-scss-module__twGYTa_...` | Custom | clip-path | UI transition | | `NavMobile-module-scss-module__twGYTa_...` | Custom | clip-path | UI transition | | `NavMobile-module-scss-module__twGYTa_...` | Fade + Move | opacity, transform | UI transition | | `NavBar-module-scss-module__s3E3Dq__na...` | Fade + Move | opacity, transform | Panel / drawer enter | | `PromptCards-module-scss-module__HcTne...` | Fade + Move | opacity, transform | UI transition | | `MediaTabs-module-scss-module__M-mPca_...` | Fade + Move | opacity, transform | UI transition | | `Pricing-module-scss-module__GLAe0a__c...` | Fade + Move | opacity, transform | UI transition | | `Marquee-module-scss-module__-zurhq__m...` | Slide | transform | UI transition | | `LetterGrid-module-scss-module__R6_SpW...` | Fade + Move | opacity, transform | Element entrance | | `TypewriterWord-module-scss-module__sR...` | Fade | opacity | Attention / status | | `AppShell-module-scss-module__F71GCG__...` | Fade | opacity | UI transition | | `AppShell-module-scss-module__F71GCG__...` | Slide | transform | Loading indicator | | `swipe-out-left` | Fade + Move | transform, opacity | Swipe gesture dismiss | | `swipe-out-right` | Fade + Move | transform, opacity | Swipe gesture dismiss | | `swipe-out-up` | Fade + Move | transform, opacity | Swipe gesture dismiss | | `swipe-out-down` | Fade + Move | transform, opacity | Swipe gesture dismiss | | `sonner-fade-in` | Fade + Move | opacity, transform | Element entrance | | `sonner-fade-out` | Fade + Move | opacity, transform | Element exit | | `sonner-spin` | Fade | opacity | Loading indicator | ### Motion Fingerprint - **Speed Character**: Deliberate & Calm (median duration: `400ms`) - **Dominant Easing**: custom cubic-bezier curves - **Animation Library**: 19 unique animations (19 total including variants) > This design moves with deliberate & calm timing using custom cubic-bezier curves, creating a UI that feels calm and controlled. ## 8. Do's and Don'ts ### Do - Use Off-White (`#faf9f5`) as the page background — it's intentionally not pure white - Use Near-Black (`#141413`) for text — not pure black, it's warmer and more readable - Use anthropicSans as the primary typeface — it defines the brand personality - Use the extracted shadow patterns for elevation — they are tuned to match the brand palette - Use Off-White (`#faf9f5`) as the primary accent — it's the brand's signature interactive color - Use 8px border-radius on buttons — the standard corner rounding for interactive elements - Maintain nav height at 88px — consistent vertical space for the navigation bar - Make the hero full-viewport (≥70% screen height) — this design uses an immersive hero, not a tall navbar - Build the hero as a split layout with media on the left — text and visual share equal weight - Include exactly 4 CTAs in the hero (primary + secondary) — this design pattern is multi-action, not single-purpose - Each card includes a top image — imagery is part of the card identity, not optional - Use a 3-column grid on desktop — density matters for this content type - Place 3 pricing tiers side-by-side on desktop — direct comparison is the value prop - Use expandable accordion for the FAQ — saves vertical space and lets users self-navigate ### Don't - Don't use pure white (`#ffffff`) as a page background — the warm tone is part of the brand identity - Don't use pure black (`#000000`) for text — the near-black adds warmth - Don't substitute with generic sans-serif or serif — the custom font carries the brand - Don't invent new shadow values — use only the extracted shadow levels - Don't introduce additional saturated accent colors — the palette is intentionally controlled - Don't collapse or hide the nav on scroll without an explicit scroll-triggered animation — the design uses fixed nav presence - Don't make the nav sticky — this design lets it scroll away to maximize content focus - Don't put a CTA button in the nav — this design uses links only at the top ## 7b. Enforceable Brand Rules *Structured Do/Don't with reasoning and validation tests. Agents can programmatically verify generated UI.* ```yaml rules: - id: brand-canvas-001 type: do rule: "Always use the page background `rgb(250, 249, 245)` as the base canvas" why: "Every component is designed to composit against this exact tone" test: "document.body.style.backgroundColor === 'rgb(250, 249, 245)'" - id: brand-accent-001 type: do rule: "Reserve `rgb(250, 249, 245)` for primary CTAs and brand-mark signals only" why: "Single chromatic assertion device — overuse dilutes meaning" test: "querySelectorAll('[style*=\"rgb(250, 249, 245)\"]').length <= 3 per fold" ``` ## 9. Responsive Behavior ### Breakpoints | Name | Width | Key Changes | |------|-------|-------------| | Mobile | 349px | Single column, compact spacing | | Mobile Large | 566px | Expanded mobile layout | | Mobile Large | 600px | Expanded mobile layout | | Mobile Large | 767px | Expanded mobile layout | | Tablet | 833px | Multi-column grids begin | | Tablet | 991px | Multi-column grids begin | ### Token Diff — Desktop vs Mobile | Element | Property | Desktop | Mobile | |---------|----------|---------|--------| | heading | font-size | `72px` | `51px` | | heading | line-height | `79.2px` | `61.2px` | | nav | display | `flex` | `none` | | nav | height | `88px` | `auto` | | hero | padding | `104px 0px 0px` | `92px 0px 0px` | | hero | height | `876px` | `820px` | | button | width | `107px` | `auto` | | card | width | `448px` | `321.922px` | ### Collapsing Strategy - Headlines: 72px → 51px on mobile - Navigation: flex → none on mobile - Cards: multi-column → stacked vertical on mobile - Footer: multi-column → stacked single column on mobile ### Touch Targets - Buttons: 8px 0px padding - Navigation: adequate spacing between items - Interactive elements: minimum 44px touch target recommended ### Collapsing Narrative How the structural patterns adapt from desktop to mobile (extracted from both viewport extractions): - **Hero collapses split-left-text → centered** — the side-by-side layout stacks vertically, with media moving above the text. - **Hero CTAs:** 4 on desktop → 3 on mobile (secondary CTAs dropped on small screens). - **Card grid: 3-up → 1-up** — cards stack as viewport narrows, becoming a vertical list on mobile. - **Pricing collapses to vertical stack** — desktop comparison becomes scrollable tier-by-tier on mobile. ## 7c. Visual Effects & Dynamic Behavior *The live/dynamic layer beyond static CSS — reproduce these, not flat substitutes. This is often what separates a faithful clone from a wireframe.* - **Scroll-driven reveals** — content animates in on scroll (CSS scroll-timeline). Build fade/translate reveal-on-scroll for below-fold bands. - **CSS-variable animations** (4) — animated custom properties. > **Motion fingerprint**: CSS scroll-driven animations ## 9b. Visual Tone & Photography **Tone:** Mixed photography + illustration A balanced mix of photographic content and vector graphics. Photos likely carry product/lifestyle context while SVG handles icons, logos, and decorative accents. **Canonical Brand Image (OG):** - https://cdn.sanity.io/images/4zrzovbb/claude-com/6c36adaaf60ecdde313a93ad255eef573ea4de97-1200x630.jpg?rect=0,2,1200,627&w=1200&h=627&fit=crop (1200×627px) *This is the image shown when the site is shared on social media — represents the brand visual essence.* **Hero Image (above-fold dominant visual):** - Aspect: 1:1 (square / portrait) - Rendered size: 64×64px - *Use this aspect ratio + composition for your clone's hero — mimicking the proportion preserves the visual hierarchy.* **Aspect Ratio Distribution:** - Landscape (1.15–2.3): 0 (0%) - Portrait (<0.87): 0 (0%) - Square (0.87–1.15): 3 (100%) **Media Format Mix:** - SVG: 3 (icons, illustrations, decorative geometry) **Average rendered image size:** 64×64px **Above-fold image count:** 0 / 3 **Imagery Guidance for clones:** - Mix photography and illustration intentionally: photos for product/context, vectors for icons + decorative accents. - Respect the format split — replacing JPGs with illustrations (or vice versa) will shift the brand tone. ## 10. Agent Prompt Guide ### Quick Reference - Background: Off-White (`#faf9f5`) - Primary text: Near-Black (`#141413`) - Accent: Off-White (`#faf9f5`) - Border: Charcoal (`#30302e`) - Font: anthropicSans - Body: 15px weight 400 ### Example Component Prompts - "Create a hero section on Off-White background (#faf9f5). Headline at 72px anthropicSans weight 330, line-height 1.1, color #141413." - "Create the primary CTA button: `#faf9f5` background, `#ffffff` text, 8px border-radius, 4px padding, 600 weight, anthropicSans font." - "Design a card on `transparent` background. Border: none. Radius: 0px. Shadow: none. Padding: 0px." - "Build navigation: static on `#faf9f5`. anthropicSans 15px weight 400 for links." ### Iteration Guide 1. **Canvas**: Set the light canvas to Off-White (`#faf9f5`) — every component is composited against this exact base. 2. **Typography**: All type in anthropicSans, weight range 300–700. Never exceed 700 — heavier weights break the brand's tonal restraint. 3. **Accent**: Off-White (`#faf9f5`) is the sole interactive color. On hover → Focus (`#2c84db`). Use CSS transitions, not opacity/brightness filters. 4. **Motion**: All transitions use `cubic-bezier(0.165,0.84,0.44,1)`. Timing: 1000ms for micro-interactions, 1000ms for layout changes. Never use linear for UI transitions — preserve the brand's easing personality. 5. **Shape**: CTAs at `0px`, cards at `0px`. Apply border-radius from the extracted scale only — don't invent intermediate values. 6. **Spacing**: Use the `--ca-space-*` token scale (16px–64px). All padding, margin, and gap values are multiples from this scale — no magic numbers. 7. **Tokens**: Import from §11 CSS Export (`--ca-*` vars). Never hardcode hex values — always reference a token so theming remains consistent. ## 11. CSS Design Tokens Raw Export *Copy-paste ready `:root {}` block — all values extracted directly from the live site.* ```css /* Colors */ :root { --ca-primary: #faf9f5; --ca-surface-1: #ffffff; --ca-surface-2: #f0eee6; --ca-primary-hover: #141413; --ca-hairline: #30302e; --ca-on-primary: #111111; --ca-primary-focus: #2e2e2c; --ca-semantic-error: #bf4d43; } /* Typography */ :root { --ca-font-primary: "anthropicSerif", system-ui, sans-serif; --ca-text-display: 72px; --ca-text-body: 12px; --ca-text-button: 17px; --ca-text-mono: 12px; } /* Spacing & Radius */ :root { --ca-space-xxs: 2px; --ca-space-xs: 16px; --ca-space-sm: 24px; --ca-space-md: 32px; --ca-space-base: 48px; --ca-space-lg: 56px; --ca-space-xl: 64px; --ca-space-2xl: 72px; --ca-space-3xl: 80px; --ca-radius-none: 0px; --ca-radius-xs: 4px; --ca-radius-sm: 8px; --ca-radius-md: 12px; --ca-radius-lg: 16px; --ca-radius-xl: 32px; --ca-radius-full: 9999px; } /* Motion */ :root { --ca-ease-in-out-quart: cubic-bezier(.77,0,.175,1); --ca-ease-out-quart: cubic-bezier(.165,.84,.44,1); --ca-ease-in-quart: cubic-bezier(.895,.03,.685,.22); --ca-ease-in-out-expo: cubic-bezier(1,0,0,1); --ca-ease-in-out-power3: cubic-bezier(.645,.045,.355,1); --ca-ease-out-power2: cubic-bezier(.25,1,.5,1); } ``` ## 13. Page Structure Skeleton *The actual layout the source site uses. Reproduce these sections in order to match the site structure.* ```yaml page-skeleton: - section: navigation tag: nav height: 88px width: 584px layout: flex-row justify=normal children: 6 vertical-padding: ~24px padding: "24px 0px" - section: header tag: header classes: ["theme-main"] height: 84px width: full-bleed layout: block children: 1 bg: "rgb(250, 249, 245)" - section: hero tag: div height: 2966px width: full-bleed layout: block children: 1 - section: feature-section tag: main height: 2966px width: full-bleed layout: block children: 6 vertical-padding: ~128px (airy) - section: feature-section tag: section classes: ["theme-main"] height: 876px width: full-bleed layout: block children: 1 bg: "rgb(250, 249, 245)" vertical-padding: ~52px padding: "104px 0px 0px" - section: navigation tag: div classes: ["container"] height: 84px width: 1312px layout: flex-row justify=space-between children: 2 - section: feature-section tag: div classes: ["container"] height: 772px width: 1312px layout: block children: 1 - section: unknown tag: div height: 724px width: 632px layout: flex-row justify=center children: 1 - section: unknown tag: div height: 313px width: 632px layout: flex-row justify=center children: 1 - section: pricing tag: section classes: ["theme-main"] height: 1409px width: full-bleed layout: block children: 1 bg: "rgb(250, 249, 245)" vertical-padding: ~96px (airy) padding: "128px 0px 64px" - section: feature-section tag: div classes: ["container"] height: 1217px width: 1312px layout: block children: 4 - section: feature-section tag: section classes: ["theme-main"] height: 681px width: full-bleed layout: block children: 1 bg: "rgb(250, 249, 245)" vertical-padding: ~128px (airy) padding: "128px 0px" - section: feature-section tag: div classes: ["container"] height: 425px width: 1312px layout: block children: 2 - section: footer tag: footer classes: ["theme-dark"] height: 1043px width: full-bleed layout: block children: 1 bg: "rgb(20, 20, 19)" tone: dark vertical-padding: ~96px (airy) padding: "95.9999px 0px" - section: content-section tag: div classes: ["container"] height: 850px width: 1312px layout: block children: 2 ``` **Agent rule**: rebuild sections in this order (sorted by vertical position). Match the layout primitive (grid N-col / flex direction / block). ## 14. Copy Library (Real Content from Source) *Actual text content extracted from the live page. Use these strings verbatim when reproducing the site — they carry the brand voice.* ```yaml copy: section-headings: - "Explore plans" - "Products" sub-headings: - "Free" - "What is Claude and how does it work?" ctas: - "Meet Claude" - "Contact sales" - "Try Claude" - "Continue with Google" - "Continue with SSO" - "Individual" - "Team and Enterprise" - "What is Claude and how does it work?" navigation: - "Login" - "Contact sales" - "Try Claude" ``` **Agent rule**: reuse these exact strings when generating UI. Do NOT translate or rephrase — brand voice is preserved through the original wording. ## 15. Asset Inventory (Image Roles & Ratios) *Image inventory classified by role and aspect ratio. When reproducing the site, allocate this number of assets per role.* ```yaml assets: thumbnail: count: 3 avg-ratio: 1.00 common-aspect: "~1:1 square" ``` **Agent rule**: when generating placeholder images, match these counts and aspect ratios. Use neutral placeholder backgrounds for `product` (e.g. `#f5f5f5`), full-color photography hints for `hero` and `editorial`. ## 16. Component HTML Templates *Suggested HTML markup for reproducing the key components — based on what was detected in the source DOM.* ### Button (primary action) ```html ``` _Source pattern detected: padding `8px 0px` · radius `0px` · weight `400`_ ### Generic Card ```html
``` _Source pattern detected: padding `28px` · radius `32px` · shadow `rgba(0, 0, 0, 0.016) 0px 4px 24px 0px, rgba(0, 0, 0, 0.016) `_ **Agent rule**: use these markup skeletons as the structural baseline. Apply tokens from §2-3 for visual styling. ## 17. Content Architecture & Resources (Links by Purpose) *The page's links classified by purpose — the information architecture to reproduce. Categories, featured images, devices and projects are extracted from the rendered DOM, not guessed.* **By purpose:** **nav** 2 · **cta** 4 · **auth** 3 · **product** 22 · **pricing** 3 · **docs** 1 · **blog** 2 · **social** 4 · **legal** 1 · **footer** 13 · **other** 5 **Primary actions (conversion path):** - Primary call-to-action — "Try Claude" (the conversion path) → `https://claude.ai/login?plan=free` - Primary call-to-action — "Try Claude" (the conversion path) → `https://claude.ai/login?plan=pro` - Primary call-to-action — "Try Claude" (the conversion path) → `https://claude.ai/login?plan=max` - Account access — "Login" (login/signup) → `https://claude.ai/login` - Primary call-to-action — "Try Claude" (the conversion path) → `https://claude.ai/` - Account access — "Log in" (login/signup) → `https://claude.ai/login` **Signals:** 10/60 links carry a featured image · dominant link roles: footer-link (25), content-card (22), inline-link (10). --- ## Extraction Completeness: 86/100 (B) | Category | Score | Max | Detail | |----------|-------|-----|--------| | Colors & Palette | 24 | 25 | 17 named colors | | Typography | 13 | 20 | 5 roles defined | | Components | 16 | 20 | 4 specs extracted | | Motion & Interaction | 15 | 15 | Keyframes, easing vars | | CSS Custom Properties | 9 | 10 | 186 vars | | Responsive Breakpoints | 5 | 5 | 6 breakpoints | | Variable Fonts | 5 | 5 | OPSZ axes | ## 12. Known Gaps & Confidence Explicit list of what this extraction could NOT capture. Agents should not invent values for these — either skip the feature or use the documented baseline + heuristic fallback. *Auto-detected extraction limitations — understand before building:* - **Licensed web fonts (anthropicSans, anthropicSerif, anthropicMono)** — detected but not downloaded. Substitute with your licensed copy or a close fallback (see Typography section for metrics). - **Sparse component extraction** — fewer than 5 component types detected. Highly dynamic sections (modals, datepickers, carousels) require interaction to render and are not captured in a static pass. - **1 parasitic shadow(s) detected** — colored box-shadows (not near-black) found in allShadows. These likely originate from browser extensions or third-party injected widgets (e.g. Grammarly, chat overlays), not from the site's own design system. Discard them when building. *✅ No critical extraction gaps detected — high-confidence reproduction expected.* ### Per-section confidence | Section | Confidence | Reason | |---------|------------|--------| | §1 Visual Theme | High | Body bg extracted via getComputedStyle() | | §2 Colors | High | 186 CSS vars (semantic naming requires ≥20 for high) | | §3 Typography | High | 5 typography roles inferred | | §4 Components | Medium | 4 component variants captured | | §7 Motion | High | Keyframes + transitions | | §8 Do's/Don'ts | High | 22 rules generated; design-decisions.json has evidence per rule | | §9 Responsive | High | 6 breakpoints detected | | §9b Photography | High | 3 images, hero present | ## 11.1 CSS Implementation Guide (CSS Interception Engine v2.15+) *Ready-to-use CSS from Prism's CSS Interception Engine — intercepted directly from the site's CSS files (bypasses CORS). Copy-paste into your `