source

---
name: Expo
description:
  Luminous monochromatic developer platform — cool off-white canvas, pill-shaped
  geometry, and full-range Inter with extreme negative tracking on display.
originalFonts:
  primary: "Inter"
  mono: "JetBrains Mono"
  fallbacks:
    - "-apple-system"
    - "system-ui"
colors:
  background: "#f0f0f3"
  surface: "#ffffff"
  surface-raised: "#1a1a1a"
  ink: "#1c2024"
  ink-muted: "#60646c"
  accent: "#000000"
  accent-alt: "#0d74ce"
  border: "#e0e1e6"
  link: "#0d74ce"
  warning: "#ab6400"
  danger: "#eb8e90"
  expo-black: "#000000"
  near-black: "#1c2024"
  link-cobalt: "#0d74ce"
  legal-blue: "#476cff"
  widget-sky: "#47c2ff"
  preview-purple: "#8145b5"
  cloud-gray: "#f0f0f3"
  pure-white: "#ffffff"
  widget-dark: "#1a1a1a"
  banner-dark: "#171717"
  slate-gray: "#60646c"
  mid-slate: "#555860"
  silver: "#b0b4ba"
  pewter: "#999999"
  light-silver: "#cccccc"
  dark-slate: "#363a3f"
  charcoal: "#333333"
  warning-amber: "#ab6400"
  destructive-rose: "#eb8e90"
  border-lavender: "#e0e1e6"
  input-border: "#d9d9e0"
  dark-focus-ring: "#2547d0"
typography:
  h1:
    family: "Inter"
    size: "4rem"
    weight: 700
    lineHeight: 1.1
  h2:
    family: "Inter"
    size: "3rem"
    weight: 600
    lineHeight: 1.1
  h3:
    family: "Inter"
    size: "1.25rem"
    weight: 600
    lineHeight: 1.2
  body:
    family: "Inter"
    size: "1rem"
    weight: 400
    lineHeight: 1.4
  button:
    family: "Inter"
    size: "1rem"
    weight: 500
    lineHeight: 1.25
  caption:
    family: "Inter"
    size: "0.875rem"
    weight: 400
    lineHeight: 1.4
  code:
    family: "JetBrains Mono"
    size: "1rem"
    weight: 400
    lineHeight: 1.4
spacing:
  xs: "0.25rem"
  sm: "0.5rem"
  md: "1rem"
  lg: "2rem"
  xl: "6rem"
rounded:
  sm: "4px"
  md: "8px"
  lg: "24px"
  xl: "9999px"
shadows:
  sm: "rgba(0,0,0,0.08) 0px 3px 6px, rgba(0,0,0,0.07) 0px 2px 4px"
  md: "rgba(0,0,0,0.1) 0px 10px 20px, rgba(0,0,0,0.05) 0px 3px 6px"
  lg: "rgba(0,0,0,0.15) 0px 20px 40px"
components:
  button-primary:
    background: "{colors.accent}"
    color: "#ffffff"
    border: "none"
    radius: "{rounded.xl}"
    padding: "0.625rem 1.25rem"
  button-secondary:
    background: "#ffffff"
    color: "{colors.ink}"
    border: "1px solid {colors.input-border}"
    radius: "6px"
    padding: "0 12px"
  card:
    background: "{colors.surface}"
    border: "1px solid {colors.border}"
    radius: "{rounded.md}"
    padding: "1.5rem"
  input:
    background: "#ffffff"
    color: "{colors.ink}"
    border: "1px solid {colors.input-border}"
    radius: "6px"
    padding: "0 12px"
---

<!-- source: VoltAgent/awesome-design-md @ 80bbbc2 (MIT) — see ATTRIBUTION.md -->

# Design System Inspiration of Expo

## 1. Visual Theme & Atmosphere

Expo's interface is a luminous, confidence-radiating developer platform built on
the premise that tools for building apps should feel as polished as the apps
themselves. The entire experience lives on a bright, airy canvas — a cool-tinted
off-white (`#f0f0f3`) that gives the page a subtle technological coolness
without the starkness of pure white. This is a site that breathes: enormous
vertical spacing between sections creates a gallery-like pace where each feature
gets its own "room."

The design language is decisively monochromatic — pure black (`#000000`)
headlines against the lightest possible backgrounds, with a spectrum of cool
blue-grays (`#60646c`, `#b0b4ba`, `#555860`) handling all secondary
communication. Color is almost entirely absent from the interface itself; when
it appears, it's reserved for product screenshots, app icons, and the React
universe illustration — making the actual content burst with life against the
neutral canvas.

What makes Expo distinctive is its pill-shaped geometry. Buttons, tabs, video
containers, and even images use generously rounded or fully pill-shaped corners
(24px–9999px), creating an organic, approachable feel that contradicts the
typical sharp-edged developer tool aesthetic. Combined with tight letter-spacing
on massive headlines (-1.6px to -3px at 64px), the result is a design that's
simultaneously premium and friendly — like an Apple product page reimagined for
developers.

**Key Characteristics:**

- Luminous cool-white canvas (`#f0f0f3`) with gallery-like vertical spacing
- Strictly monochromatic: pure black headlines, cool blue-gray body text, no
  decorative color
- Pill-shaped geometry everywhere — buttons, tabs, containers, images
  (24px–9999px radius)
- Massive display headlines (64px) with extreme negative letter-spacing (-1.6px
  to -3px)
- Inter as the sole typeface, used at weights 400–900 for full expressive range
- Whisper-soft shadows that barely lift elements from the surface
- Product screenshots as the only source of color in the interface

## 2. Color Palette & Roles

### Primary

- **Expo Black** (`#000000`): The absolute anchor — used for primary headlines,
  CTA buttons, and the brand identity. Pure black on cool white creates maximum
  contrast without feeling aggressive.
- **Near Black** (`#1c2024`): The primary text color for body content — a barely
  perceptible blue-black that's softer than pure #000 for extended reading.

### Secondary & Accent

- **Link Cobalt** (`#0d74ce`): The standard link color — a trustworthy,
  saturated blue that signals interactivity without competing with the
  monochrome hierarchy.
- **Legal Blue** (`#476cff`): A brighter, more saturated blue for legal/footer
  links — slightly more attention-grabbing than Link Cobalt.
- **Widget Sky** (`#47c2ff`): A light, friendly cyan-blue for widget branding
  elements — the brightest accent in the system.
- **Preview Purple** (`#8145b5`): A rich violet used for "preview" or beta
  feature indicators — creating clear visual distinction from standard content.

### Surface & Background

- **Cloud Gray** (`#f0f0f3`): The primary page background — a cool off-white
  with the faintest blue-violet tint. Not warm, not sterile — precisely
  technological.
- **Pure White** (`#ffffff`): Card surfaces, button backgrounds, and elevated
  content containers. Creates a clear "lifted" distinction from Cloud Gray.
- **Widget Dark** (`#1a1a1a`): Dark surface for dark-theme widgets and overlay
  elements.
- **Banner Dark** (`#171717`): The darkest surface variant, used for promotional
  banners and high-contrast containers.

### Neutrals & Text

- **Slate Gray** (`#60646c`): The workhorse secondary text color (305
  instances). A cool blue-gray that's authoritative without being heavy.
- **Mid Slate** (`#555860`): Slightly darker than Slate, used for emphasized
  secondary text.
- **Silver** (`#b0b4ba`): Tertiary text, placeholders, and de-emphasized
  metadata. Comfortably readable but clearly receded.
- **Pewter** (`#999999`): Accordion icons and deeply de-emphasized UI elements
  in dark contexts.
- **Light Silver** (`#cccccc`): Arrow icons and decorative elements in dark
  contexts.
- **Dark Slate** (`#363a3f`): Borders on dark surfaces, switch tracks, and
  emphasized containment.
- **Charcoal** (`#333333`): Dark mode switch backgrounds and deep secondary
  surfaces.

### Semantic & Accent

- **Warning Amber** (`#ab6400`): A warm, deep amber for warning states —
  deliberately not bright yellow, conveying seriousness.
- **Destructive Rose** (`#eb8e90`): A soft pink-coral for disabled destructive
  actions — gentler than typical red, reducing alarm fatigue.
- **Border Lavender** (`#e0e1e6`): Standard card/container borders — a cool
  lavender-gray that's visible without being heavy.
- **Input Border** (`#d9d9e0`): Button and form element borders — slightly
  warmer/darker than card borders for interactive elements.
- **Dark Focus Ring** (`#2547d0`): Deep blue for keyboard focus indicators in
  dark theme contexts.

### Gradient System

- The design is notably **gradient-free** in the interface layer. Visual
  richness comes from product screenshots, the React universe illustration, and
  careful shadow layering rather than color gradients. This absence IS the
  design decision — gradients would undermine the clinical precision.

## 3. Typography Rules

### Font Family

- **Primary**: `Inter`, with fallbacks: `-apple-system, system-ui`
- **Monospace**: `JetBrains Mono`, with fallback: `ui-monospace`
- **System Fallback**:
  `system-ui, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji`

### Hierarchy

| Role            | Font           | Size           | Weight  | Line Height  | Letter Spacing | Notes                                  |
| --------------- | -------------- | -------------- | ------- | ------------ | -------------- | -------------------------------------- |
| Display / Hero  | Inter          | 64px (4rem)    | 700–900 | 1.10 (tight) | -1.6px to -3px | Maximum impact, extreme tracking       |
| Section Heading | Inter          | 48px (3rem)    | 600     | 1.10 (tight) | -2px           | Feature section anchors                |
| Sub-heading     | Inter          | 20px (1.25rem) | 600     | 1.20 (tight) | -0.25px        | Card titles, feature names             |
| Body Large      | Inter          | 18px (1.13rem) | 400–500 | 1.40         | normal         | Intro paragraphs, section descriptions |
| Body / Button   | Inter          | 16px (1rem)    | 400–700 | 1.25–1.40    | normal         | Standard text, nav links, buttons      |
| Caption / Label | Inter          | 14px (0.88rem) | 400–600 | 1.00–1.40    | normal         | Descriptions, metadata, badge text     |
| Tag / Small     | Inter          | 12px (0.75rem) | 500     | 1.00–1.60    | normal         | Smallest sans-serif text, badges       |
| Code Body       | JetBrains Mono | 16px (1rem)    | 400–600 | 1.40         | normal         | Inline code, terminal commands         |
| Code Caption    | JetBrains Mono | 14px (0.88rem) | 400–600 | 1.40         | normal         | Code snippets, technical labels        |
| Code Small      | JetBrains Mono | 12px (0.75rem) | 400     | 1.60         | normal         | Uppercase tech tags                    |

### Principles

- **One typeface, full expression**: Inter is the only sans-serif, used from
  weight 400 (regular) through 900 (black). This gives the design a unified
  voice while still achieving dramatic contrast between whisper-light body text
  and thundering display headlines.
- **Extreme negative tracking at scale**: Headlines at 64px use -1.6px to -3px
  letter-spacing, creating ultra-dense text blocks that feel like logotypes.
  This aggressive compression is the signature typographic move.
- **Weight as hierarchy**: 700–900 for display, 600 for headings, 500 for
  emphasis, 400 for body. The jumps are decisive — no ambiguous in-between
  weights.
- **Consistent 1.40 body line-height**: Nearly all body and UI text shares 1.40
  line-height, creating a rhythmic vertical consistency.

## 4. Component Stylings

### Buttons

**Primary (White on border)**

- Background: Pure White (`#ffffff`)
- Text: Near Black (`#1c2024`)
- Padding: 0px 12px (compact, content-driven height)
- Border: thin solid Input Border (`1px solid #d9d9e0`)
- Radius: subtly rounded (6px)
- Shadow: subtle combined shadow on hover
- The understated default — clean, professional, unheroic

**Primary Pill**

- Same as Primary but with pill-shaped radius (9999px)
- Used for hero CTAs and high-emphasis actions
- The extra roundness signals "start here"

**Dark Primary**

- Background: Expo Black (`#000000`)
- Text: Pure White (`#ffffff`)
- Pill-shaped (9999px) or generously rounded (32–36px)
- No border (black IS the border)
- The maximum-emphasis CTA — reserved for primary conversion actions

### Cards & Containers

- Background: Pure White (`#ffffff`) — clearly lifted from Cloud Gray page
- Border: thin solid Border Lavender (`1px solid #e0e1e6`) for standard cards
- Radius: comfortably rounded (8px) for standard cards; generously rounded
  (16–24px) for featured containers
- Shadow Level 1: Whisper
  (`rgba(0,0,0,0.08) 0px 3px 6px, rgba(0,0,0,0.07) 0px 2px 4px`) — barely
  perceptible lift
- Shadow Level 2: Standard
  (`rgba(0,0,0,0.1) 0px 10px 20px, rgba(0,0,0,0.05) 0px 3px 6px`) — clear
  floating elevation
- Hover: likely subtle shadow deepening or background shift

### Inputs & Forms

- Background: Pure White (`#ffffff`)
- Text: Near Black (`#1c2024`)
- Border: thin solid Input Border (`1px solid #d9d9e0`)
- Padding: 0px 12px (inline with button sizing)
- Radius: subtly rounded (6px)
- Focus: blue ring shadow via CSS custom property

### Navigation

- Sticky top nav on transparent/blurred background
- Logo: Expo wordmark in black
- Links: Near Black (`#1c2024`) or Slate Gray (`#60646c`) at 14–16px Inter
  weight 500
- CTA: Black pill button ("Sign Up") on the right
- GitHub star badge as social proof
- Status indicator ("All Systems Operational") with green dot

### Image Treatment

- Product screenshots and device mockups are the visual heroes
- Generously rounded corners (24px) on video and image containers
- Screenshots shown in realistic device frames
- Dark UI screenshots provide contrast against the light canvas
- Full-bleed within rounded containers

### Distinctive Components

**Universe React Logo**

- Animated/illustrated React logo as the visual centerpiece
- Connects Expo's identity to the React ecosystem
- The only illustrative element on an otherwise photographic page

**Device Preview Grid**

- Multiple device types (phone, tablet, web) shown simultaneously
- Demonstrates cross-platform capability visually
- Each device uses realistic device chrome

**Status Badge**

- "All Systems Operational" pill in the nav
- Green dot + text — compact trust signal
- Pill-shaped (36px radius)

## 5. Layout Principles

### Spacing System

- Base unit: 8px
- Scale: 1px, 2px, 4px, 8px, 12px, 16px, 24px, 32px, 40px, 48px, 64px, 80px,
  96px, 144px
- Button padding: 0px 12px (unusually compact — height driven by line-height)
- Card internal padding: approximately 24–32px
- Section vertical spacing: enormous (estimated 96–144px between major sections)
- Component gap: 16–24px between sibling elements

### Grid & Container

- Max container width: approximately 1200–1400px, centered
- Hero: centered single-column with massive breathing room
- Feature sections: alternating layouts (image left/right, full-width showcases)
- Card grids: 2–3 column for feature highlights
- Full-width sections with contained inner content

### Whitespace Philosophy

- **Gallery-like pacing**: Each section feels like its own exhibit, surrounded
  by vast empty space. This creates a premium, unhurried browsing experience.
- **Breathing room is the design**: The generous whitespace IS the primary
  design element — it communicates confidence, quality, and that each feature
  deserves individual attention.
- **Content islands**: Sections float as isolated "islands" in the white space,
  connected by scrolling rather than visual continuation.

### Border Radius Scale

- Nearly squared (4px): Small inline elements, tags
- Subtly rounded (6px): Buttons, form inputs, combo boxes — the functional
  interactive radius
- Comfortably rounded (8px): Standard content cards, containers
- Generously rounded (16px): Feature tabs, content panels
- Very rounded (24px): Buttons, video/image containers, tabpanels — the
  signature softness
- Highly rounded (32–36px): Hero CTAs, status badges, nav buttons
- Pill-shaped (9999px): Primary action buttons, tags, avatars — maximum
  friendliness

## 6. Depth & Elevation

| Level              | Treatment                                                         | Use                                     |
| ------------------ | ----------------------------------------------------------------- | --------------------------------------- |
| Flat (Level 0)     | No shadow                                                         | Cloud Gray page background, inline text |
| Surface (Level 1)  | White bg, no shadow                                               | Standard white cards on Cloud Gray      |
| Whisper (Level 2)  | `rgba(0,0,0,0.08) 0px 3px 6px` + `rgba(0,0,0,0.07) 0px 2px 4px`   | Subtle card lift, hover states          |
| Elevated (Level 3) | `rgba(0,0,0,0.1) 0px 10px 20px` + `rgba(0,0,0,0.05) 0px 3px 6px`  | Feature showcases, product screenshots  |
| Modal (Level 4)    | Dark overlay (`--dialog-overlay-background-color`) + heavy shadow | Dialogs, overlays                       |

**Shadow Philosophy**: Expo uses shadows as gentle whispers rather than
architectural statements. The primary depth mechanism is **background color
contrast** — white cards floating on Cloud Gray — rather than shadow casting.
When shadows appear, they're soft, diffused, and directional (downward),
creating the feeling of paper hovering millimeters above a desk.

## 7. Do's and Don'ts

### Do

- Use Cloud Gray (`#f0f0f3`) as the page background and Pure White (`#ffffff`)
  for elevated cards — the two-tone light system is essential
- Keep display headlines at extreme negative letter-spacing (-1.6px to -3px at
  64px) for the signature compressed look
- Use pill-shaped (9999px) radius for primary CTA buttons — the organic shape is
  core to the identity
- Reserve black (`#000000`) for headlines and primary CTAs — it carries maximum
  authority on the light canvas
- Use Slate Gray (`#60646c`) for secondary text — it's the precise balance
  between readable and receded
- Maintain enormous vertical spacing between sections (96px+) — the gallery
  pacing defines the premium feel
- Use product screenshots as the primary visual content — the interface stays
  monochrome, the products bring color
- Apply Inter at the full weight range (400–900) — weight contrast IS the
  hierarchy

### Don't

- Don't introduce decorative colors into the interface chrome — the
  monochromatic palette is intentional
- Don't use sharp corners (border-radius < 6px) on interactive elements — the
  pill/rounded geometry is the signature
- Don't reduce section spacing below 64px — the breathing room is the design
- Don't use heavy drop shadows — depth comes from background contrast and
  whisper-soft shadows
- Don't mix in additional typefaces — Inter handles everything from display to
  caption
- Don't use letter-spacing wider than -0.25px on body text — extreme tracking is
  reserved for display only
- Don't use borders heavier than 2px — containment is subtle, achieved through
  background color and gentle borders
- Don't add gradients to the interface — visual richness comes from content, not
  decoration
- Don't use saturated colors outside of semantic contexts — the palette is
  strictly grayscale + functional blue

## 8. Responsive Behavior

### Breakpoints

| Name    | Width      | Key Changes                                                            |
| ------- | ---------- | ---------------------------------------------------------------------- |
| Mobile  | <640px     | Single column, hamburger nav, stacked cards, hero text scales to ~36px |
| Tablet  | 640–1024px | 2-column grids, condensed nav, medium hero text                        |
| Desktop | >1024px    | Full multi-column layout, expanded nav, massive hero (64px)            |

_Only one explicit breakpoint detected (640px), suggesting a fluid,
container-query or min()/clamp()-based responsive system rather than fixed
breakpoint snapping._

### Touch Targets

- Buttons use generous radius (24–36px) creating large, finger-friendly surfaces
- Navigation links spaced with adequate gap
- Status badge sized for touch (36px radius)
- Minimum recommended: 44x44px

### Collapsing Strategy

- **Navigation**: Full horizontal nav with CTA collapses to hamburger on mobile
- **Feature sections**: Multi-column → stacked single column
- **Hero text**: 64px → ~36px progressive scaling
- **Device previews**: Grid → stacked/carousel
- **Cards**: Side-by-side → vertical stacking
- **Spacing**: Reduces proportionally but maintains generous rhythm

### Image Behavior

- Product screenshots scale proportionally
- Device mockups may simplify or show fewer devices on mobile
- Rounded corners maintained at all sizes
- Lazy loading for below-fold content

## 9. Agent Prompt Guide

### Quick Color Reference

- Primary CTA / Headlines: "Expo Black (#000000)"
- Page Background: "Cloud Gray (#f0f0f3)"
- Card Surface: "Pure White (#ffffff)"
- Body Text: "Near Black (#1c2024)"
- Secondary Text: "Slate Gray (#60646c)"
- Borders: "Border Lavender (#e0e1e6)"
- Links: "Link Cobalt (#0d74ce)"
- Tertiary Text: "Silver (#b0b4ba)"

### Example Component Prompts

- "Create a hero section on Cloud Gray (#f0f0f3) with a massive headline at 64px
  Inter weight 700, line-height 1.10, letter-spacing -3px. Text in Expo Black
  (#000000). Below, add a subtitle in Slate Gray (#60646c) at 18px. Place a
  black pill-shaped CTA button (9999px radius) beneath."
- "Design a feature card on Pure White (#ffffff) with a 1px solid Border
  Lavender (#e0e1e6) border and comfortably rounded corners (8px). Title in Near
  Black (#1c2024) at 20px Inter weight 600, description in Slate Gray (#60646c)
  at 16px. Add a whisper shadow (rgba(0,0,0,0.08) 0px 3px 6px)."
- "Build a navigation bar with Expo logo on the left, text links in Near Black
  (#1c2024) at 14px Inter weight 500, and a black pill CTA button on the right.
  Background: transparent with blur backdrop. Bottom border: 1px solid Border
  Lavender (#e0e1e6)."
- "Create a code block using JetBrains Mono at 14px on a Pure White surface with
  Border Lavender border and 8px radius. Code in Near Black, keywords in Link
  Cobalt (#0d74ce)."
- "Design a status badge pill (9999px radius) with a green dot and 'All Systems
  Operational' text in Inter 12px weight 500. Background: Pure White, border:
  1px solid Input Border (#d9d9e0)."

### Iteration Guide

1. Focus on ONE component at a time
2. Reference specific color names and hex codes — "use Slate Gray (#60646c)" not
   "make it gray"
3. Use radius values deliberately — 6px for buttons, 8px for cards, 24px for
   images, 9999px for pills
4. Describe the "feel" alongside measurements — "enormous breathing room with
   96px section spacing"
5. Always specify Inter and the exact weight — weight contrast IS the hierarchy
6. For shadows, specify "whisper shadow" or "standard elevation" from the
   elevation table
7. Keep the interface monochrome — let product content be the color