expo.dev

DESIGN.md

Narrative design system document — paste directly into Claude Code, Cursor, or Bolt.

---
version: alpha
name: expo.dev
description: "Light product system built on #fcfcfd with #47c2ff as the primary CTA accent. Type anchored in Inter at 64px / weight 700. Extracted automatically from https://expo.dev/ — every value from getComputedStyle(), no approximation."
narrative: |
  expo.dev is built on a soft, near-white canvas (rgb(252, 252, 253)).
  The system uses #47c2ff as the high-saturation accent for primary actions.
  Sharp 0px corners on CTAs — architectural restraint, engineering precision alongside Inter as the primary typeface.

colors:
  background: "#fcfcfd"
  surface-1: "#f0f0f3"
  surface-2: "#f9f9fb"
  ink: "#1c2024"
  ink-subtle: "#5c5c5c"
  primary: "#47c2ff"
  on-primary: "#ffffff"
  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"
    fontSize: 64px
    fontWeight: 700
    lineHeight: 1.1
    letterSpacing: -3px
  display-md:
    fontFamily: "JetBrains Mono"
    fontSize: 16px
    fontWeight: 600
    lineHeight: 1.4
    letterSpacing: 0
  headline:
    fontFamily: "JetBrains Mono"
    fontSize: 14px
    fontWeight: 600
    lineHeight: 1.4
    letterSpacing: 0
  body:
    fontFamily: "Apple Color Emoji"
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
    letterSpacing: 0
  body-sm:
    fontFamily: "JetBrains Mono"
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.4
    letterSpacing: 0
  button:
    fontFamily: "Inter"
    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: 12px
  md: 12px
  lg: 24px
  xl: 32px
  xxl: 64px
  section: 80px

components:
  button-ghost:
    backgroundColor: "transparent"
    textColor: "{colors.ink}"
    typography: "{typography.display-md}"
    rounded: "{rounded.none}"
  button-pill:
    backgroundColor: "transparent"
    textColor: "{colors.ink}"
    typography: "{typography.headline}"
    rounded: "{rounded.lg}"
    padding: 0px 16px
  button-pill:
    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
  tab-pill-tab:
    backgroundColor: "{colors.on-primary}"
    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: "2026-05-30T20:38:53.966Z"
completeness: 90
scoreVersion: "v2"

---

# Design System — expo.dev
> Extracted automatically by Clone Architect from https://expo.dev
> Date: 2026-05-30
> Viewport: Desktop 1440x900 + Mobile 390x844
> Every value in this file comes from real getComputedStyle() — no approximation.

> **🤖 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**: `#47c2ff` for primary CTAs ONLY. Never decorative.
> - **Body type**: 16px (token: `typography.body`). Default for ALL text not in a heading role.
> - **Section rhythm**: 48px 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 off-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. **#47c2ff** (`#47c2ff`) provides interactive distinction without visual aggression. Elevation is built from multi-layer shadow stacks — each level combines several blurred layers at varying offsets to simulate the way light actually falls on stacked surfaces, not the simulated drop-shadow of cheap interfaces. 
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: Off-White (`#fcfcfd`)
- Primary typeface: Inter
- Primary text: Near Black (`#1c2024`)
- Accent: #47c2ff (`#47c2ff`)
- 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
- **Off-White** (`#fcfcfd`): Page background (primary)
- **Pure White** (`#ffffff`): Surface / elevated background
- **Light Gray** (`#f0f0f3`): Surface / elevated background
- **Light Gray** (`#e0e1e6`): Surface / elevated background
- **Off-White** (`#f9f9fb`): Surface / elevated background

### Text & Content
- **Near Black** (`#1c2024`): Primary body text
- **Pure Black** (`#000000`): Secondary text
- **Dark Gray** (`#363a3f`): Secondary text
- **Near Black** (`#171717`): Secondary text

### Accent & Interactive
- **#b8ae63** (`#b8ae63`): Interactive / accent
- **M Tricolor Blue** (`#0d74ce`): Interactive / accent
- **Teal** (`#30a46c`): Interactive / accent
- **#f76b15** (`#f76b15`): Interactive / accent
- **Teal** (`#218358`): Interactive / accent
- **M Tricolor Blue** (`#0072de`): Interactive / accent
- **Sky Bright** (`#0090ff`): Interactive / accent

### Border & Divider
- **Silver** (`#cdced6`): Borders / dividers
- **Silver** (`#b0b4ba`): Borders / dividers
- **#d9d9e0** (`#d9d9e0`): Borders / dividers
- **Light Gray** (`#e8e8ec`): Borders / dividers

### Full Extracted Palette
134 distinct colors detected on the live page (20 categorized above + 114 additional below). Every value is a real `getComputedStyle()` color — no approximation.

- `#80838d` — Medium Gray
- `#60646c` — Dim Gray
- `#2b9a66` — Teal
- `#405d96` — #405d96
- `#feebec` — Warm Cream
- `#fefbe9` — Warm Cream
- `#5c5c5c` — Dim Gray
- `#476cff` — Ring Blue
- `#335cff` — #335cff
- `#4f3422` — Charcoal
- `#ebebeb` — Light Gray
- `#363d49` — Dark Gray
- `#cc4e00` — #cc4e00
- `#ffcdce` — Pink
- `#0588f0` — #0588f0
- `#f4a9aa` — #f4a9aa
- `#fefcfb` — Snow
- `#e6e6e6` — Light Gray
- `#fefcfe` — Pure White
- `#ab6400` — #ab6400
- `#8b8d98` — Medium Gray
- `#47c2ff` — #47c2ff
- `#2547d0` — #2547d0
- `#ffba18` — Amber
- `#5eb1ef` — Cornflower Blue
- `#d1afec` — Plum
- `#402060` — #402060
- `#fee9f5` — Warm Cream
- `#fff7c2` — Vibrant Yellow
- `#ffdfb5` — Vibrant Yellow
- `#1a1a1a` — Near Black
- `#8ec8f6` — Baby Blue
- *…+82 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) |
| Link | JetBrains Mono | 14px | 400 | 1.4 | normal | Link (14px) — Decoration: none |

### 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

**Ghost**
- Background: `transparent`
- Text: `#1c2024` `{colors.ink}`
- Padding: 0px
- Radius: 0px
- Font: 16px weight 400
- Use: Subtle action, toolbar, nav button
- Focus: outline: `rgb(5, 136, 240) solid 2px`

**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)
- Shadow: `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0...`
- Font: 14px weight 400
- Use: Status pills, tags, chips
- Focus: outline: `rgb(5, 136, 240) solid 2px`

**Ghost**
- Background: `transparent`
- Text: `#1c2024` `{colors.ink}`
- Padding: 16px
- Radius: 16px
- Font: 16px weight 500
- Use: Subtle action, toolbar, nav button
- 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) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0...`
- 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

### Tabs

**Pill Tab**
- Background: `#ffffff` `{colors.on-primary}`
- 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:** text #b8ae63 → #ffffff, 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(28, 32, 36)"
    focus:
      bg: "rgba(0, 0, 0, 0)"
      fg: "rgb(28, 32, 36)"
  link:
    default:
      bg: "rgba(0, 0, 0, 0)"
      fg: "rgb(184, 174, 99)"
    hover:
      bg: "rgba(0, 0, 0, 0)"
      fg: "rgb(255, 255, 255)"
  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) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 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) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0"
```

**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`, `Pill`, `Pill`, `Ghost`
- **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

### 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
Compact spacing — information density prioritized

| Token | Value |
|-------|-------|
| xxs | 2px |
| xs | 4px |
| sm | 12px |
| md | 12px |
| base | 16px |
| lg | 24px |
| xl | 32px |
| 2xl | 48px |
| 3xl | 64px |

### 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 | `0px` |
| Cards & Containers | `20px` |
| Navigation | `none` |
| Tabs | `24px` |
| Page Body | `0px` |

**Shape Personality**: Generously Rounded — Soft, friendly corners (8px+). Approachable, consumer-facing feel.

**Full Radius Spectrum**: 4px, 8px, 12px, 14px, 16px, 20px, 24px, 32px (from `allBorderRadii` scan)


## 5b. Spacing Rhythm Names

*Named spacing tokens with explicit use cases. Use these names in YOUR code instead of raw pixels for consistency.*

| Name | Value | Use case |
|------|-------|----------|
| **hero** | `64px` | Top/bottom of full-bleed hero sections |
| **section** | `32px` | Between major bands (color change, content shift) |
| **subsection** | `24px` | Within a section, between content groups |
| **card** | `12px` | Card padding, list-item spacing |
| **compact** | `12px` | 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:** 4 (primary: "Get started for free")
- **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:** 1396×1426px (aspect 0.98:1)
- **Gap:** 0px between cards
- **Content:** ✗ no image
- **Clone instruction:** Build a 1-column grid (desktop) with cards at ~0.98:1 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) | <br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px` | Cards, elevated surfaces |
| Layered (Level 2) | <br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0.15) 0px 20px 40px 0px` | Cards, elevated surfaces |
| Layered (Level 3) | <br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0.08) 0px 3px 6px 0px`,<br>`rgba(0, 0, 0, 0.07) 0px 2px 4px 0px` | Cards, elevated surfaces |
| Layered (Level 4) | <br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0) 0px 0px 0px 0px`,<br>`rgba(0, 0, 0, 0.1) 0px 10px 20px 0px`,<br>`rgba(0, 0, 0, 0.05) 0px 3px 6px 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 |
| `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 |
| `c15t-enter-rkppV` | Fade + Move | opacity, transform | Element entrance |

> *3 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**: 23 unique animations (23 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 Off-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 #47c2ff (`#47c2ff`) 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–32px 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 4 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 `#47c2ff` for primary CTAs and brand-mark signals only"
    why: "Single chromatic assertion device — overuse dilutes meaning"
    test: "querySelectorAll('[style*=\"#47c2ff\"]').length <= 3 per fold"
```

## 9. Responsive Behavior

### Breakpoints
| Name | Width | Key Changes |
|------|-------|-------------|
| Mobile | 640px | Single column layout |
| Tablet | 768px | 2-column grids |
| Desktop | 1024px | Full layout |
| Large Desktop | 1280px | Maximum 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).

## 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

**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: Off-White (`#fcfcfd`)
- Primary text: Near Black (`#1c2024`)
- Accent: #47c2ff (`#47c2ff`)
- Border: Medium Gray (`#80838d`)
- Font: Inter
- Body: 16px weight 400

### Example Component Prompts
- "Create a hero section on Off-White background (#fcfcfd). Headline at 64px Inter weight 700, line-height 1.1, letter-spacing -3px, color #1c2024."
- "Create the primary CTA button: `#47c2ff` 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 Off-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**: #47c2ff (`#47c2ff`) is the sole interactive color. On hover → #b8ae63 (`#b8ae63`). 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–32px). 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: #47c2ff;
  --ca-on-primary: #ffffff;
  --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-small: 14px;
  --ca-text-button: 14px;
}

/* Spacing & Radius */
:root {
  --ca-space-xxs: 2px;
  --ca-space-xs: 4px;
  --ca-space-sm: 12px;
  --ca-space-md: 12px;
  --ca-space-base: 16px;
  --ca-space-lg: 24px;
  --ca-space-xl: 32px;
  --ca-space-2xl: 48px;
  --ca-space-3xl: 64px;
  --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: unknown
    tag: div
    classes: ["relative", "isolate", "z-0", "min-h-dvh"]
    height: 9091px
    width: 1430px
    layout: block
    children: 2
    bg: "rgb(255, 255, 255)"
  - section: section-5
    tag: section
    classes: ["relative", "py-12", "max-sm:py-0", "max-sm:pb-4"]
    height: 1469px
    width: 1430px
    layout: block
    children: 3
    padding: "48px 0px"
  - section: hero
    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: section-6
    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)"
    padding: "96px 0px"
  - section: section-7
    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)"
    padding: "144px 0px"
  - section: section-8
    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)"
    padding: "144px 0px"
  - section: section-9
    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)"
    padding: "144px 0px"
  - section: section-10
    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)"
    padding: "144px 0px"
  - section: section-11
    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)"
    padding: "144px 0px"
  - section: section-12
    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-13
    tag: section
    classes: ["relative", "min-h-225", "overflow-hidden", "py-12"]
    height: 900px
    width: 1430px
    layout: block
    children: 3
    padding: "48px 0px"
  - section: footer
    tag: footer
    height: 524px
    width: 1430px
    layout: block
    children: 1
  - section: navigation
    tag: nav
    classes: ["flex", "gap-10", "py-10", "lg:gap-4"]
    height: 444px
    width: 1280px
    layout: flex-row justify=normal
    children: 2
    padding: "88px 0px 48px"
  - section: section-14
    tag: section
    classes: ["py-6", "text-xs", "text-secondary", "max-md:border-t"]
    height: 80px
    width: 1280px
    layout: block
    children: 1
    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"
    - "Get started for free"
    - "Read the docs"
    - "Talk to our team"
  navigation:
    - "Docs"
    - "Product"
    - "Enterprise"
    - "Pricing"
    - "Blog"
    - "48.2K"
    - "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
<button class="btn btn-primary">
  Action
</button>
```
_Source pattern detected: padding `0px` · radius `0px` · weight `400`_

### Generic Card
```html
<div class="card">
  <!-- content -->
</div>
```
_Source pattern detected: padding `0px` · radius `20px` · shadow `rgba(0, 0, 0, 0) 0px 0px 0px 0px, rgba(0, 0, 0, 0) 0px 0px 0`_

**Agent rule**: use these markup skeletons as the structural baseline. Apply tokens from §2-3 for visual styling.


## 12. Known Extraction Gaps

*Auto-detected limitations of this extraction — understand before building:*

- **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.


---
## Extraction Completeness: 90/100 (A)

| Category | Score | Max | Detail |
|----------|-------|-----|--------|
| Colors & Palette | 25 | 25 | 20 named colors |
| Typography | 20 | 20 | 8 roles defined |
| Components | 16 | 20 | 4 specs extracted |
| Motion & Interaction | 15 | 15 | Keyframes present, easing vars |
| CSS Custom Properties | 10 | 10 | 551 vars |
| Responsive Breakpoints | 4 | 5 | 4 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.

| 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 | 551 CSS vars (semantic naming requires ≥20 for high) |
| §3 Typography | High | 8 typography roles inferred |
| §4 Components | Medium | 4 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 | 4 breakpoints detected |
| §9b Photography | High | 53 images, hero present |

---
*Generated by Clone Architect — automated Playwright extraction + design analysis.*
*Source: https://expo.dev | 2026-05-30T20:38:54.099Z*
*All values verified via getComputedStyle() — no approximation, no hallucination.*