--- version: alpha name: expo.dev description: "Light product system built on #fcfcfd with #30a46c as the primary CTA accent. Type anchored in Inter at 64px / weight 700. Extracted automatically from https://expo.dev/ — rendered styles via getComputedStyle() + CSS custom properties (token-only values may not be painted)." narrative: | expo.dev is built on a soft, near-white canvas (rgb(252, 252, 253)). The system uses rgb(48, 164, 108) as the accent for primary actions and brand signals. Sharp 0px corners on CTAs — architectural restraint, engineering precision alongside Inter as the primary typeface. A layered elevation system (7 distinct shadows) building a clear front-to-back hierarchy. Motion is a first-class concern — 24 keyframe animations plus transition-driven interactions. colors: background: "#fcfcfd" surface-1: "#f0f0f3" surface-2: "#f9f9fb" ink: "#1c2024" ink-subtle: "#5c5c5c" primary: "#30a46c" on-primary: "#111111" primary-hover: "#363d49" hairline: "#80838d" primary-focus: "#2547d0" semantic-error: "#ffcdce" semantic-success: "#8eceaa" semantic-warning: "#ab6400" semantic-info: "#0588f0" typography: display-xl: fontFamily: "Inter, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif" fontSize: 64px fontWeight: 700 lineHeight: 1.1 letterSpacing: -3px display-md: fontFamily: "JetBrains Mono, 'SF Mono', 'JetBrains Mono', Menlo, monospace" fontSize: 16px fontWeight: 600 lineHeight: 1.4 letterSpacing: 0 headline: fontFamily: "JetBrains Mono, 'SF Mono', 'JetBrains Mono', Menlo, monospace" fontSize: 14px fontWeight: 600 lineHeight: 1.4 letterSpacing: 0 body: fontFamily: "Inter, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif" fontSize: 16px fontWeight: 400 lineHeight: 1.4 letterSpacing: 0 button: fontFamily: "Inter, 'SF Pro Display', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif" fontSize: 14px fontWeight: 400 lineHeight: 1.4 letterSpacing: 0 rounded: none: 0px xs: 4px sm: 8px md: 14px lg: 20px xl: 32px pill: 9999px spacing: xxs: 2px xs: 4px sm: 8px md: 12px lg: 24px xl: 48px xxl: 88px components: button-pill: backgroundColor: "transparent" textColor: "{colors.ink}" typography: "{typography.headline}" rounded: "{rounded.lg}" padding: 0px 16px button-pill-2: backgroundColor: "transparent" textColor: "{colors.ink}" typography: "{typography.headline}" rounded: "{rounded.xl}" padding: 0px 8px 0px 16px card-standard-card: backgroundColor: "{colors.background}" typography: "{typography.display-md}" rounded: "{rounded.lg}" navigation-main-nav: backgroundColor: "transparent" typography: "{typography.display-md}" rounded: "{rounded.none}" padding: 12px 12px 4px status-badge-tinted: backgroundColor: "{colors.primary}" textColor: "{colors.ink}" typography: "{typography.display-md}" rounded: "{rounded.pill}" tab-pill-tab: backgroundColor: "#ffffff" textColor: "{colors.ink}" typography: "{typography.display-md}" rounded: "{rounded.lg}" padding: 8px tab-ghost-tab: backgroundColor: "transparent" textColor: "{colors.ink}" typography: "{typography.display-md}" rounded: "{rounded.md}" padding: 16px extracted_at: "2026-06-11T05:00:37.209Z" completeness: 93 scoreVersion: "v2" --- # Design System — expo.dev > Extracted automatically by Prism from https://expo.dev > 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**: animated  |  **Weight**: heavy  |  **Aesthetic**: soft-rounded | Dimension | Value | Signal | |---|---|---| | Canvas | neutral | `#fcfcfd` | | Type posture | sans-led (Inter) | "Everything you need to build a" | | Color assertion | dual-accent | #30a46c | | Whitespace | sparse | section rhythm 68px | | Interaction | animated | 24 keyframes, 9 transitions | | Radius language | soft-pill | from token scale | **Prism fingerprint**: `neutral-canvas · sans-display · dual-accent · soft-pill · animated-motion` > **🤖 TL;DR for AI agents** (read this first — saves you scanning the full doc): > > - **Canvas**: `rgb(252, 252, 253)` is the page background. Every component composits against this. > - **Accent**: `rgb(48, 164, 108)` for primary CTAs ONLY. Never decorative. > - **Body type**: 16px (token: `typography.body`). Default for ALL text not in a heading role. > - **Section rhythm**: 68px between major bands. Card padding: 24px. > - **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 expo.dev sits on a pure white canvas (`#fcfcfd`), a neutral foundation calibrated for sustained reading and component contrast. Typography is anchored in **Inter**. Headlines use weight 700 for confident, assertive presence — the brand wants to be heard. Negative letter-spacing at display sizes (-3px at 64px) compresses headlines into engineered blocks, dense and precise. Body text reads in Near-Black (`#1c2024`) — softened from pure black, a small but deliberate detail that lowers reading friction. **Teal** (`#30a46c`) is the single high-saturation color in the system — it earns its presence only on interactive elements, making CTAs and links the unmistakable focal points against the otherwise neutral palette. Elevation is built from multi-layer shadow stacks (7 distinct) — each combines several blurred layers at varying offsets to build a clear front-to-back hierarchy. Border radius varies from pill-shaped (fully rounded) to moderately rounded elements, creating visual rhythm. Motion design uses smooth easing curves for polished state transitions. **Key Characteristics:** - Background: Pure White (`#fcfcfd`) - Primary typeface: Inter - Primary text: Near-Black (`#1c2024`) - Accent: Teal (`#30a46c`) - Display: 64px weight 700, letter-spacing -3px - Shadow system: 7 distinct elevation levels - Custom fonts loaded: Inter, JetBrains Mono ## 2. Color Palette & Roles ### Background & Surface - **Pure White** (`#fcfcfd`): Page background (primary) - **Pure White** (`#ffffff`): Surface / elevated background - **Whitesmoke** (`#d9d9e0`): Surface / elevated background - **Off-White** (`#f0f0f3`): Surface / elevated background - **Whitesmoke** (`#e0e1e6`): Surface / elevated background ### Text & Content - **Near-Black** (`#1c2024`): Primary body text - **Pure Black** (`#000000`): Secondary text - **Charcoal** (`#363a3f`): Secondary text - **Near-Black** (`#171717`): Secondary text ### Accent & Interactive - **Teal** (`#30a46c`): Interactive / accent - **#8eceaa** (`#8eceaa`): Interactive / accent - **Teal** (`#218358`): Interactive / accent - **#b8ae63** (`#b8ae63`): Interactive / accent - **M Tricolor Blue** (`#0d74ce`): Interactive / accent - **#f76b15** (`#f76b15`): Interactive / accent - **M Tricolor Blue** (`#0072de`): Interactive / accent ### Border & Divider - **Light Grey** (`#cdced6`): Borders / dividers - **Grey** (`#b0b4ba`): Borders / dividers - **Whitesmoke** (`#e8e8ec`): Borders / dividers ### Full Extracted Palette **25 colors rendered on the page** + **109** more declared in design tokens (CSS custom properties — not necessarily painted). (19 categorized above + 115 additional below.) Rendered values are read via `getComputedStyle()`; token values come from CSS variable declarations. Third-party logo colors are filtered out. - `#80838d` — Medium Gray - `#60646c` — Dim Gray - `#f9f9fb` — Off-White - `#0090ff` — Sky Bright - `#2b9a66` — Teal - `#405d96` — #405d96 - `#feebec` — Warm Cream *(token)* - `#fefbe9` — Warm Cream *(token)* - `#5c5c5c` — Slate Grey *(token)* - `#476cff` — Ring Blue *(token)* - `#4f3422` — Charcoal *(token)* - `#335cff` — #335cff *(token)* - `#ebebeb` — Whitesmoke *(token)* - `#363d49` — Dark Gray *(token)* - `#cc4e00` — #cc4e00 *(token)* - `#ffcdce` — Pink *(token)* - `#f4a9aa` — #f4a9aa *(token)* - `#0588f0` — #0588f0 *(token)* - `#fefcfb` — Pure White *(token)* - `#e6e6e6` — Whitesmoke *(token)* - `#fefcfe` — Pure White *(token)* - `#ab6400` — #ab6400 *(token)* - `#8b8d98` — Medium Gray *(token)* - `#47c2ff` — #47c2ff *(token)* - `#2547d0` — #2547d0 *(token)* - `#5eb1ef` — Cornflower Blue *(token)* - `#ffba18` — Amber *(token)* - `#d1afec` — Plum *(token)* - `#402060` — #402060 *(token)* - `#fee9f5` — Warm Cream *(token)* - `#fff7c2` — Vibrant Yellow *(token)* - `#ffdfb5` — Vibrant Yellow *(token)* - *…+83 more in `raw-css.json` (`desktop.allColors`).* ### CSS Custom Properties (Design Tokens) **Spacing Token** - `--dialog-card-gap`: `.375rem` - `--tw-space-x-reverse`: `0` - `--legal-links-gap`: `.75rem` - `--accordion-padding`: `.875rem` **Border Radius Token** - `--accordion-radius`: `.625rem` - `--widget-radius`: `0` - `--dialog-card-radius`: `1.25rem` - `--banner-border-radius-sm`: `.3125rem` **Shadow Token** - `--button-shadow-neutral-hover`: `none` - `--accordion-focus-shadow`: `0 0 0 2px #476cff` - `--button-shadow-primary`: `0px 1px 2px 0px #0e121b0f,inset 0 0 0 1px #335cff` - `--tw-inset-ring-shadow`: `0 0 #0000` **Motion Token** - `--banner-entry-animation`: `c15t-enter-OSOPL .15s ease-out` - `--legal-links-transition`: `text-decoration .2s ease` - `--button-hover-transition-full`: `background-color .15s ease-in-out,box-shadow .15s ease-in-out,color .15s ease-in-out` **Z-Index Token** - `--dialog-overlay-z-index`: `1000000000` - `--dialog-z-index`: `1000000000` - `--widget-z-index`: `50` **Font Size Token** - `--button-font-size`: `.875rem` - `--dialog-branding-font-size`: `1rem` - `--dialog-title-font-size`: `.875rem` - `--dialog-description-font-size`: `1rem` **Font Weight Token** - `--dialog-description-font-weight`: `400` - `--button-font-weight`: `500` - `--font-weight-extrabold`: `800` - `--font-weight-medium`: `500` **Other tokens** - `--accordion-icon-color`: `#5c5c5c` - `--text-base--line-height`: `1.4` - `--widget-border-color`: `#ebebeb` - `--switch-background-color-dark`: `#333` - `--expo-theme-button-primary-destructive-text`: `#fff` - `--banner-title-color`: `#171717` - `--dialog-overlay-background-color`: `#00000080` - `--expo-theme-text-link`: `#0d74ce` ## 3. Typography Rules ### Font Families - **Primary**: `Inter` - **Secondary**: `JetBrains Mono` - **Font 3**: `ui-monospace` - **Font 4**: `system-ui` ### Custom Fonts Loaded - **Inter** weight 100 900 (normal) - **JetBrains Mono** weight 100 800 (normal) ### Typography Hierarchy | Role | Font | Size | Weight | Line Height | Letter Spacing | Notes | |------|------|------|--------|-------------|----------------|-------| | Display Hero | Inter | 64px | 700 | 1.1 | -3px | Main headline (h1) | | Sub-heading | JetBrains Mono | 16px | 600 | 1.4 | normal | Third-level heading (h3) | | Card Title | Apple Color Emoji | 16px | 400 | 1.5 | normal | Card headings | | Body | Inter | 16px | 400 | 1.4 | normal | Standard reading text | | Label Heading | JetBrains Mono | 14px | 600 | 1.4 | normal | Small heading (H4) | | Button | Inter | 14px | 400 | 1.4 | normal | Button label (14px) | | Button | Inter | 14px | 500 | 1.4 | normal | Button label (14px) | ### Font Weight Scale CSS custom properties define 12 explicit weight steps: - `--font-weight-light`: `300` — Light - `--dialog-description-font-weight`: `400` — Regular - `--font-weight-normal`: `400` — Regular - `--tw-font-weight`: `400` — Regular - `--button-font-weight`: `500` — Medium - `--font-weight-medium`: `500` — Medium - `--dialog-branding-font-weight`: `500` — Medium - `--dialog-title-font-weight`: `600` — SemiBold - `--font-weight-semibold`: `600` — SemiBold - `--font-weight-bold`: `700` — Bold - `--font-weight-extrabold`: `800` — ExtraBold - `--font-weight-black`: `900` — Black ### Full Font Size Scale Sizes detected in the design (descending): `64px`, `48px`, `20px`, `18px`, `16px`, `14px`, `12px` > 4 size(s) detected outside the sampled hierarchy (48px, 20px, 18px, 12px). These appear on elements not in the sampled set — likely additional display sizes, marketing-section overrides, or third-party-widget styles. ## 4. Component Stylings ### Buttons **Pill** - Background: `transparent` - Text: `#1c2024` `{colors.ink}` - Padding: 0px 16px - Radius: 24px - Font: 14px weight 400 - Use: Status pills, tags, chips - Focus: outline: `rgb(5, 136, 240) solid 2px` **Pill** - Background: `transparent` - Text: `#1c2024` `{colors.ink}` - Padding: 0px 8px 0px 16px - Radius: 36px - Border: 1px solid rgba(0, 0, 0, 0) - Font: 14px weight 400 - Use: Status pills, tags, chips - Focus: outline: `rgb(5, 136, 240) solid 2px` ### Cards & Containers **Standard Card** - Background: `#fcfcfd` `{colors.background}` - Padding: 0px - Radius: 20px - Border: 1px solid rgb(232, 232, 236) - Shadow: `rgba(0, 0, 0, 0.12) 0px 15px 25px 0px, rgba(0, 0, 0, 0.05) 0px 5px 10px 0px` - Use: Content containers, listing items ### Navigation **Main Nav** - Background: `transparent` - Padding: 12px 12px 4px - Radius: none - Font: 16px weight 400 - Use: Static flex nav — N/A items ### Status Badges **Tinted** - Background: `#30a46c` `{colors.primary}` - Text: `#1c2024` `{colors.ink}` - Padding: 0px - Radius: 9999px - Font: 16px weight 400 - Use: Status indicator, label, pill ### Tabs **Pill Tab** - Background: `#ffffff` - Text: `#1c2024` `{colors.ink}` - Padding: 8px - Radius: 24px - Font: 16px weight 400 - Use: Navigation tabs, filter tabs **Ghost Tab** - Background: `transparent` - Text: `#1c2024` `{colors.ink}` - Padding: 16px - Radius: 16px - Font: 16px weight 500 - Use: Navigation tabs, filter tabs ## 4b. Component Behaviors (State Matrix) ### Interaction State Narrative - **Link**: - **hover:** shadow added *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(28, 32, 36)" focus: bg: "transparent" fg: "inherit" link: default: bg: "color(srgb 0.976471 0.976471 0.984314 / 0.8)" fg: "rgb(28, 32, 36)" border: "1px solid rgb(217, 217, 224)" hover: bg: "transparent" fg: "inherit" card: default: bg: "rgb(252, 252, 253)" fg: "rgb(28, 32, 36)" border: "1px solid rgb(232, 232, 236)" shadow: "rgba(0, 0, 0, 0.12) 0px 15px 25px 0px, rgba(0, 0, 0, 0.05) 0" navLink: default: bg: "rgba(0, 0, 0, 0)" fg: "rgb(28, 32, 36)" tab: default: bg: "rgba(0, 0, 0, 0)" fg: "rgb(28, 32, 36)" footerLink: default: bg: "rgb(0, 0, 0)" fg: "rgb(28, 32, 36)" shadow: "rgba(0, 0, 0, 0.05) 0px 5px 10px 0px, rgba(0, 0, 0, 0.12) 0p" ``` **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 - **1 shape(s)** in this system: `Pill` - **DO NOT introduce new buttons variants** without justification ### Cards & Containers - **1 shape(s)** in this system: `Standard Card` - **DO NOT introduce new cards & containers variants** without justification ### Navigation - **1 shape(s)** in this system: `Main Nav` - **DO NOT introduce new navigation variants** without justification ### Status Badges - **1 shape(s)** in this system: `Tinted` - **DO NOT introduce new status badges variants** without justification ### Tabs - **2 shape(s)** in this system: `Pill Tab`, `Ghost Tab` - **DO NOT introduce new tabs variants** without justification ## 5. Layout Principles ### Layout Type **top-nav + content** ### Grid Single column, centered content ### Max Width 440px ### Spacing System Generous spacing — editorial breathing room | Token | Value | |-------|-------| | xxs | 2px | | xs | 4px | | sm | 8px | | md | 12px | | base | 16px | | lg | 24px | | xl | 48px | | 2xl | 68px | | 3xl | 88px | ### Border Radius Scale | Name | Value | Use | |------|-------|-----| | None | 0px | No rounding | | Xs | 4px | Tiny corners (badges, micro elements) | | Sm | 8px | Buttons, inputs, small elements | | Md | 14px | Cards, containers | | Lg | 20px | Large rounded elements, pill segments | | Xl | 32px | Category strips, featured containers | | Full | 9999px | Pills, avatars, circular elements | ### Shape Language | Component | Border Radius | |-----------|---------------| | Buttons | `24px` | | Cards & Containers | `20px` | | Navigation | `none` | | Status Badges | `9999px` | | Tabs | `24px` | | Page Body | `0px` | **Shape Personality**: Sharp + Pill Contrast — Angular precision with pill-shaped accents (status badges, tags). Creates strong visual hierarchy. **Full Radius Spectrum**: 4px, 8px, 12px, 14px, 16px, 20px, 24px, 32px (from `allBorderRadii` scan) ## 5b. Spacing Rhythm Names **Measured section padding**: bands use ~144px internal vertical padding (up to 144px) — **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** | `88px` | Top/bottom of full-bleed hero sections | | **section** | `48px` | Between major bands (color change, content shift) | | **subsection** | `24px` | Within a section, between content groups | | **card** | `12px` | Card padding, list-item spacing | | **compact** | `8px` | Form fields, tight clusters, badge padding | | **micro** | `4px` | 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). **5/8 structural patterns detected.** ### Hero Pattern - **Composition:** centered — Centered composition — heading + subheading + CTAs stacked vertically, content centered horizontally. Common for SaaS marketing pages. - **Viewport coverage:** full-viewport hero (≥70% screen height) - **Heading:** "Everything you need to build apps" — 64px center-aligned - **Subheading:** "Expo is a full-stack React Native framework with powerful cloud services to help you move faster at every stage of the app lifecycle." - **Media:** present, positioned top - **CTAs:** 5 (primary: "What's new?Introducing EAS Observe") - **Clone instruction:** Reproduce the **centered** layout. Use the heading font-size token at the documented size. Place media top of text. ### Navigation Pattern - **Position:** static (scrolls with page) - **Layout:** unknown — Layout not classified - **Height:** 68px - **Logo:** ✓ present - **Nav links:** 4 primary items - **CTAs in nav:** 4 - **Clone instruction:** Build a static unknown navigation. Reserve 4 slots for primary CTAs. ### Card Grid Pattern - **Card count:** 3 cards detected - **Columns (desktop):** 1-up grid - **Card dimensions:** 1396×1490px (aspect 0.94:1) - **Gap:** 0px between cards - **Content:** ✗ no image - **Clone instruction:** Build a 1-column grid (desktop) with cards at ~0.94:1 aspect ratio. Text/icon-only cards (no photography). ### CTA Banner Pattern - **Banner count:** 2 - **Position:** multiple - **Visual treatment:** ✓ contrasting background - **Primary CTA text:** "Publish" - **Clone instruction:** Place multiple CTA banners across page sections. Use contrasting solid background. ### Footer Pattern - **Columns:** 5 - **Links:** 42 total - **Height:** 524px - **Includes:** ✗ no newsletter | ✓ social icons | ✓ copyright - **Clone instruction:** Build a 5-column footer with ~8 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, 0.08) 0px 3px 6px 0px`,
`rgba(0, 0, 0, 0.07) 0px 2px 4px 0px` | Cards, elevated surfaces | | Layered (Level 2) |
`rgba(0, 0, 0, 0.15) 0px 20px 40px 0px` | Cards, elevated surfaces | | Layered (Level 3) |
`rgba(0, 0, 0, 0.1) 0px 10px 20px 0px`,
`rgba(0, 0, 0, 0.05) 0px 3px 6px 0px` | Cards, elevated surfaces | | Layered (Level 4) |
`rgba(0, 0, 0, 0.05) 0px 5px 10px 0px`,
`rgba(0, 0, 0, 0.12) 0px 15px 25px 0px` | Cards, elevated surfaces | **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 | |--------------|-------|---------------| | `--widget-accordion-ease` | `cubic-bezier(.4,0,.2,1)` | Ease Out — Decelerating | | `--accordion-ease` | `cubic-bezier(.4,0,.2,1)` | Ease Out — Decelerating | | `--default-transition-timing-function` | `cubic-bezier(.4, 0, .2, 1)` | Ease Out — Decelerating | | `--switch-ease` | `cubic-bezier(.4,0,.2,1)` | Ease Out — Decelerating | | `--ease-out` | `cubic-bezier(0, 0, .2, 1)` | Ease Out — Decelerating | | `--ease-in-out` | `cubic-bezier(.4, 0, .2, 1)` | Ease Out — Decelerating | ### Duration Scale | CSS Variable | Value | Tier | |--------------|-------|------| | `--switch-duration` | `.2s` | Normal | | `--accordion-duration` | `.2s` | Normal | | `--banner-animation-duration` | `.2s` | Normal | | `--dialog-animation-duration` | `.2s` | Normal | | `--default-transition-duration` | `.15s` | Fast | | `--widget-accordion-duration` | `.2s` | Normal | ### Copy-Paste Transition Snippets **Color / Background** ```css transition: color 0.15s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.15s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.15s cub...; ``` **Opacity** ```css transition: opacity 0.15s cubic-bezier(0.4, 0, 0.2, 1); ``` **Transform** ```css transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1), translate 0.15s cubic-bezier(0.4, 0, 0.2, 1), scale 0.15s cubic-bezier(...; ``` **Opacity** ```css transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1); ``` ### Keyframe Animation Catalog | Animation Name | Type | Animated Props | Use Hint | |----------------|------|----------------|----------| | `spin` | Rotate / Spin | transform | Loading indicator | | `pulse` | Fade | opacity | Attention / status | | `status-pulse` | Fade + Move | opacity, transform | Attention / status | | `fadeIn` | Fade | opacity | Element entrance | | `fadeOut` | Fade | opacity | Element exit | | `slideDownAndFade` | Fade + Move | opacity, transform | Panel / drawer enter | | `slideRightAndFade` | Fade + Move | opacity, transform | UI transition | | `slideLeftAndFade` | Fade + Move | opacity, transform | UI transition | | `slideUpAndFade` | Fade + Move | opacity, transform | Panel / drawer enter | | `largeSlideUpAndFadeIn` | Fade + Move | opacity, transform | Element entrance | | `largeSlideDownAndFadeIn` | Fade + Move | opacity, transform | Element entrance | | `progressBar` | Custom | background-position-x, background-position-y | UI transition | | `contentLoading` | Custom | background-position-x, background-position-y | Loading indicator | | `recapHeroEntrance` | Fade + Move | opacity, transform | UI transition | | `marquee` | Slide | transform | UI transition | | `caret-blink` | Fade | opacity | Attention / status | | `collapsibleOpen` | Fade | opacity, grid-template-rows | UI transition | | `collapsibleClosed` | Fade | opacity, grid-template-rows | UI transition | | `c15t-accordionDown-BXyWj` | Fade | opacity, height | UI transition | | `c15t-accordionUp-JM5v8` | Fade | height, opacity | UI transition | > *4 additional animations omitted (repetitive variants). See raw keyframes in `raw-css.json`.* ### Motion Fingerprint - **Speed Character**: Balanced Pacing (median duration: `200ms`) - **Dominant Easing**: custom cubic-bezier curves - **Animation Library**: 24 unique animations (24 total including variants) > This design moves with balanced pacing timing using custom cubic-bezier curves, creating a UI that feels natural and fluid. ## 8. Do's and Don'ts ### Do - Use Pure White (`#fcfcfd`) as the page background — it's intentionally not pure white - Use Near-Black (`#1c2024`) for text — not pure black, it's warmer and more readable - Use Inter as the primary typeface — it defines the brand personality - Use negative letter-spacing (-3px) at display sizes for compressed, editorial headlines - Use the extracted shadow patterns for elevation — they are tuned to match the brand palette - Use full-pill radius (9999px) only for specific elements (avatars, pills, toggles) - Use Teal (`#30a46c`) as the primary accent — it's the brand's signature interactive color - Use 24px border-radius on primary buttons — the brand uses generously-rounded CTAs - Use 20px border-radius on cards — consistent with the grid card corners - Maintain nav height at 68px — consistent vertical space for the navigation bar - Respect the 4px–48px spacing range — the design uses a wide scale for visual breathing room - Make the hero full-viewport (≥70% screen height) — this design uses an immersive hero, not a tall navbar - Include exactly 5 CTAs in the hero (primary + secondary) — this design pattern is multi-action, not single-purpose - Repeat the primary CTA across 2 banner sections — conversion paths are layered, not single - Build a content-dense footer (5 columns, ~42 links) — this site treats the footer as a sitemap, not an afterthought ### 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 increase letter-spacing on headings — the type is designed to run tight at scale - Don't invent new shadow values — use only the extracted shadow levels - Don't apply pill radius on rectangular buttons or cards — it's reserved for specific interactive elements - Don't introduce additional saturated accent colors — the palette is intentionally controlled - Don't use sharp-cornered or pill buttons — 24px is the CTA border-radius standard - 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 ## 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(252, 252, 253)` as the base canvas" why: "Every component is designed to composit against this exact tone" test: "document.body.style.backgroundColor === 'rgb(252, 252, 253)'" - id: brand-accent-001 type: do rule: "Reserve `rgb(48, 164, 108)` for primary CTAs and brand-mark signals only" why: "Single chromatic assertion device — overuse dilutes meaning" test: "querySelectorAll('[style*=\"rgb(48, 164, 108)\"]').length <= 3 per fold" ``` ## 9. Responsive Behavior ### Breakpoints | Name | Width | Key Changes | |------|-------|-------------| | Mobile | 468px | Single column, compact spacing | | Mobile Large | 640px | Expanded mobile layout | | Mobile Large | 767px | Expanded mobile layout | | Tablet | 1008px | Multi-column grids begin | | Large Desktop | 1328px | Maximum content width | | Large Desktop | 1500px | Maximum content width | ### Token Diff — Desktop vs Mobile | Element | Property | Desktop | Mobile | |---------|----------|---------|--------| | heading | font-size | `64px` | `32px` | | heading | font-weight | `700` | `600` | | heading | line-height | `70.4px` | `35.2px` | | heading | letter-spacing | `-3px` | `-0.5px` | | card | width | `360px` | `348px` | ### Collapsing Strategy - Headlines: 64px → 32px on mobile - Navigation: horizontal links → hamburger menu on mobile - Cards: multi-column → stacked vertical on mobile - Footer: multi-column → stacked single column on mobile ### Touch Targets - Buttons: 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): - **Navigation collapses to hamburger** — 4 links visible on desktop, 0 on mobile (the rest hide behind a menu toggle). - **Nav CTAs reduced** on mobile (4 → 0) — the design prioritizes content over conversion buttons at small sizes. - **Footer columns collapse:** 5 columns (desktop) → 2 columns (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.* - **Canvas / 2D rendering** — animated/interactive canvas (charts, graphs, particle fields). Reproduce as live data-viz (e.g. an animated SVG/Canvas line chart), NOT a static image. - **WebGL** — GPU 3D/shader graphics (hero atmosphere is rendered, not a flat gradient). - **Clip-path shapes** — 8 non-rectangular cut(s). - **CSS-variable animations** (2) — animated custom properties. > **Motion fingerprint**: WebGL/3D canvas, non-rectangular shapes (10) ## 9b. Visual Tone & Photography **Tone:** Photography-driven The site is dominated by photography (JPG/WebP). Photos carry the brand voice as much as the typography. Use authentic, brand-appropriate imagery — generic stock will degrade quality. **Canonical Brand Image (OG):** - https://static.expo.dev/static/home/9-2025/og-image.png *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: 1.78:1 (landscape (16:9-ish)) - Rendered size: 1280×720px - Alt text: "Deploy Expo" - *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): 7 (13%) - Portrait (<0.87): 0 (0%) - Square (0.87–1.15): 46 (87%) **Media Format Mix:** - JPG: 2 (typically photographic content) - WebP: 15 (optimized photo/illustration hybrid) - PNG: 20 (logos, transparent UI elements, mockups) - SVG: 9 (icons, illustrations, decorative geometry) **Average rendered image size:** 224×168px **Above-fold image count:** 1 / 53 **Decorative Patterns Detected:** - 2 multi-stop linear gradients (mesh-like, 3+ color stops) — the brand leans on rich color transitions for visual depth - 7 radial gradients — circular color blooms used for spotlight/glow effects - 4 large decorative SVG shapes (≥200×200px, non-icon) — likely blob/illustration accents - **Glassmorphism** detected (`backdrop-filter: blur`) — layered transparent surfaces with blur, modern OS-like aesthetic **Clone instruction for decorative work:** This is a gradient-rich design — invest in multi-stop CSS gradients (3+ color stops), not solid backgrounds. **Imagery Guidance for clones:** - Source authentic photography (or licensed stock that matches the brand mood) — placeholders will visibly degrade the clone. - Match the dominant aspect ratio (see above) so card grids and hero compositions hold. ## 10. Agent Prompt Guide ### Quick Reference - Background: Pure White (`#fcfcfd`) - Primary text: Near-Black (`#1c2024`) - Accent: Teal (`#30a46c`) - Border: Medium Gray (`#80838d`) - Font: Inter - Body: 16px weight 400 ### Example Component Prompts - "Create a hero section on Pure White background (#fcfcfd). Headline at 64px Inter weight 700, line-height 1.1, letter-spacing -3px, color #1c2024." - "Create the primary CTA button: `#30a46c` background, `#1c2024` text, 9999px border-radius, 12px 24px padding, 700 weight, Inter font." - "Design a card on `#fcfcfd` background. Border: 1px solid rgb(232, 232, 236). Radius: 20px. Shadow: use extracted shadow. Padding: 0px." - "Build navigation: relative on `#fcfcfd`. Inter 16px weight 400 for links." ### Iteration Guide 1. **Canvas**: Set the light canvas to Pure White (`#fcfcfd`) — every component is composited against this exact base. 2. **Typography**: All type in Inter, weight range 300–900. Never exceed 900 — heavier weights break the brand's tonal restraint. 3. **Accent**: Teal (`#30a46c`) is the sole interactive color. On hover → #8eceaa (`#8eceaa`). Use CSS transitions, not opacity/brightness filters. 4. **Focus**: Render focus rings in #2547d0 (`#2547d0`) — never hide focus outlines. The ring color is distinct from the accent to avoid ambiguity. 5. **Motion**: All transitions use `cubic-bezier(0.4,0,0.2,1)`. Timing: 150ms for micro-interactions, 200ms for layout changes. Never use linear for UI transitions — preserve the brand's easing personality. 6. **Shape**: CTAs at `0px`, cards at `20px`. Apply border-radius from the extracted scale only — don't invent intermediate values. 7. **Spacing**: Use the `--ca-space-*` token scale (4px–48px). All padding, margin, and gap values are multiples from this scale — no magic numbers. 8. **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-background: #fcfcfd; --ca-surface-1: #f0f0f3; --ca-surface-2: #f9f9fb; --ca-ink: #1c2024; --ca-ink-subtle: #5c5c5c; --ca-primary: #30a46c; --ca-on-primary: #111111; --ca-primary-hover: #363d49; --ca-hairline: #80838d; --ca-primary-focus: #2547d0; --ca-semantic-error: #ffcdce; --ca-semantic-success: #8eceaa; --ca-semantic-warning: #ab6400; --ca-semantic-info: #0588f0; } /* Typography */ :root { --ca-font-primary: "Inter", system-ui, sans-serif; --ca-text-display: 64px; --ca-text-body: 16px; --ca-text-button: 14px; } /* Spacing & Radius */ :root { --ca-space-xxs: 2px; --ca-space-xs: 4px; --ca-space-sm: 8px; --ca-space-md: 12px; --ca-space-base: 16px; --ca-space-lg: 24px; --ca-space-xl: 48px; --ca-space-2xl: 68px; --ca-space-3xl: 88px; --ca-radius-none: 0px; --ca-radius-xs: 4px; --ca-radius-sm: 8px; --ca-radius-md: 14px; --ca-radius-lg: 20px; --ca-radius-xl: 32px; --ca-radius-full: 9999px; } /* Motion */ :root { --ca-ease-out: cubic-bezier(0, 0, .2, 1); --ca-ease-in-out: cubic-bezier(.4, 0, .2, 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: hero tag: div classes: ["relative", "isolate", "z-0", "min-h-dvh"] height: 9155px width: 1430px layout: block children: 2 bg: "rgb(255, 255, 255)" - section: feature-section tag: section classes: ["relative", "py-12", "max-sm:py-0", "max-sm:pb-4"] height: 1533px width: 1430px layout: block children: 3 vertical-padding: ~48px padding: "48px 0px" - section: unknown tag: div classes: ["c15t-root-tnx7V", "c15t-bottomLeft-wv7ez", "p-4!", "pointer-events-auto"] height: 142px width: 392px layout: flex-column justify=normal children: 1 padding: "16px" - section: feature-section tag: section classes: ["dark-theme", "bg-palette-black", "py-24", "text-palette-white"] height: 1898px width: 1430px layout: block children: 1 bg: "rgb(0, 0, 0)" vertical-padding: ~96px (airy) padding: "96px 0px" - section: feature-section tag: section classes: ["relative", "h-fit", "py-36", "max-md:py-24"] height: 698px width: 1430px layout: block children: 2 bg: "rgb(249, 249, 251)" vertical-padding: ~144px (airy) padding: "144px 0px" - section: feature-section tag: section classes: ["relative", "h-fit", "py-36", "max-md:py-24"] height: 454px width: 1430px layout: block children: 2 bg: "rgb(249, 249, 251)" vertical-padding: ~144px (airy) padding: "144px 0px" - section: feature-section tag: section classes: ["relative", "h-fit", "py-36", "max-md:py-24"] height: 870px width: 1430px layout: block children: 2 bg: "rgb(249, 249, 251)" vertical-padding: ~144px (airy) padding: "144px 0px" - section: feature-section tag: section classes: ["relative", "h-fit", "py-36", "max-md:py-24"] height: 878px width: 1430px layout: block children: 2 bg: "rgb(249, 249, 251)" vertical-padding: ~144px (airy) padding: "144px 0px" - section: feature-section tag: section classes: ["relative", "h-fit", "py-36", "max-md:py-24"] height: 960px width: 1430px layout: block children: 2 bg: "rgb(249, 249, 251)" vertical-padding: ~144px (airy) padding: "144px 0px" - section: content-section tag: section classes: ["relative", "h-fit", "p-0", "max-md:p-0"] height: 800px width: 1430px layout: block children: 2 bg: "rgb(249, 249, 251)" - section: section tag: section classes: ["relative", "min-h-225", "overflow-hidden", "py-12"] height: 900px width: 1430px layout: block children: 3 vertical-padding: ~48px padding: "48px 0px" - section: footer tag: footer height: 524px width: 1430px layout: block children: 1 contains: chart/canvas (reproduce as live data-viz, not a flat image) - section: navigation tag: nav classes: ["flex", "gap-10", "py-10", "lg:gap-4"] height: 444px width: 1280px layout: flex-row justify=normal children: 2 vertical-padding: ~68px (generous) contains: chart/canvas (reproduce as live data-viz, not a flat image) padding: "88px 0px 48px" - section: logo-strip tag: section classes: ["py-6", "text-xs", "text-secondary", "max-md:border-t"] height: 80px width: 1280px layout: block children: 1 vertical-padding: ~24px padding: "24px 0px" ``` **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: - "Expo is a full-stack React Native framework with powerful cloud services to help you move faster at" - "Build your app with the best tools in the universe" - "Get your app on every device" - "Get your latest changes to every user, instantly" sub-headings: - "Expo SDK" - "Web deployment" - "User population" - "Serving 100s of millions of end users" - "Product" ctas: - "Docs" - "Product" - "48.2K" - "Log in" - "Sign up" - "What's new? Introducing EAS Observe" - "Get started for free" - "Read the docs" navigation: - "Product" - "48.2K" - "Docs" - "Enterprise" - "Pricing" - "Blog" - "Log in" - "Sign up" - "Star us on GitHub" - "Expo CLI on GitHub" footer-links: - "Star us on GitHub" - "All Systems Operational" ``` **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: logo: count: 1 avg-ratio: 2.02 common-aspect: "~16:9 landscape" sample-alts: - "Team avatars" product: count: 5 avg-ratio: 1.10 common-aspect: "~1:1 square" sample-alts: - "Expo SDK image" - "Developer experience image" - "Expo Go device" thumbnail: count: 41 avg-ratio: 1.00 common-aspect: "~1:1 square" sample-alts: - "App Icon 1" - "App Icon 2" - "App Icon 3" ``` **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 `0px` · radius `0px` · weight `400`_ ### Generic Card ```html
``` _Source pattern detected: padding `0px` · radius `20px` · shadow `rgba(0, 0, 0, 0.12) 0px 15px 25px 0px, rgba(0, 0, 0, 0.05) 0`_ **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** 1 · **cta** 2 · **auth** 1 · **product** 3 · **pricing** 1 · **docs** 11 · **blog** 3 · **social** 26 · **footer** 9 · **other** 3 **Primary actions (conversion path):** - Account access — "Log in" (login/signup) → `https://expo.dev/login` - Primary call-to-action — "Sign up" (the conversion path) → `https://expo.dev/signup` - Primary call-to-action — "Get started for free" (the conversion path) → `https://expo.dev/signup?redirect_uri=/new` **Signals:** 27/60 links carry a featured image · dominant link roles: footer-link (21), content-card (18), inline-link (16). --- ## Extraction Completeness: 93/100 (A) | Category | Score | Max | Detail | |----------|-------|-----|--------| | Colors & Palette | 25 | 25 | 19 named colors | | Typography | 18 | 20 | 7 roles defined | | Components | 20 | 20 | 5 specs extracted | | Motion & Interaction | 15 | 15 | Keyframes, easing vars | | CSS Custom Properties | 10 | 10 | 552 vars | | Responsive Breakpoints | 5 | 5 | 6 breakpoints | | Variable Fonts | 0 | 5 | None detected | ## 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 (Inter, JetBrains Mono)** — detected but not downloaded. Substitute with your licensed copy or a close fallback (see Typography section for metrics). | Category | What's missing | Fallback strategy | |----------|----------------|-------------------| | **Form inputs** | No text input fields detected on this page | Use the documented border-radius + accent border on focus; 12-16px padding inside | ### Per-section confidence | Section | Confidence | Reason | |---------|------------|--------| | §1 Visual Theme | High | Body bg extracted via getComputedStyle() | | §2 Colors | High | 552 CSS vars (semantic naming requires ≥20 for high) | | §3 Typography | High | 7 typography roles inferred | | §4 Components | High | 5 component variants captured | | §7 Motion | High | Keyframes + transitions | | §8 Do's/Don'ts | High | 25 rules generated; design-decisions.json has evidence per rule | | §9 Responsive | High | 6 breakpoints detected | | §9b Photography | High | 53 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 `