Design system booking.com

---
version: alpha
name: "booking.com"
description: "Design system extracted from https://www.booking.com/?chal_t=1790634201850&force_referer= on 2026-09-28"
colors:
  background: "#ffffff"
  surface: "#e7e7e7"
  foreground: "#1a1a1a"
  muted-foreground: "#595959"
  primary: "#003b95"
  on-primary: "#ffffff"
  secondary: "#ffb700"
  border: "#e7e7e7"
typography:
  headline-display:
    fontFamily: "Avenir Next"
    fontSize: "24px"
    fontWeight: 700
    lineHeight: "1.33"
  headline-lg:
    fontFamily: "Avenir Next"
    fontSize: "24px"
    fontWeight: 700
    lineHeight: "1.33"
  headline-md:
    fontFamily: "BlinkMacSystemFont"
    fontSize: "16px"
    fontWeight: 700
    lineHeight: "1.5"
  body-md:
    fontFamily: "BlinkMacSystemFont"
    fontSize: "14px"
    fontWeight: 400
    lineHeight: "1.43"
  label-md:
    fontFamily: "BlinkMacSystemFont"
    fontSize: "12px"
    fontWeight: 400
    lineHeight: "1.17"
  button:
    fontFamily: "BlinkMacSystemFont"
    fontSize: "14px"
    fontWeight: 500
    lineHeight: "1.43"
rounded:
  none: "0px"
  sm: "4px"
  md: "8px"
  full: "9999px"
spacing:
  unit: "4px"
  1: "4px"
  2: "8px"
  3: "12px"
  4: "16px"
  5: "24px"
components:
  button-ghost:
    backgroundColor: "#003b95"
    textColor: "#ffffff"
    typography: "{typography.button}"
    rounded: "4px"
    height: "48px"
    padding: "8px 12px"
  button-secondary:
    backgroundColor: "#ffffff"
    textColor: "#006ce4"
    typography: "{typography.button}"
    rounded: "4px"
    height: "36px"
    padding: "4px 12px"
  card:
    backgroundColor: "transparent"
    rounded: "8px"
    padding: "0px"
---

# booking.com

## Overview

Booking.com | Official site | The best hotels, flights, car rentals & accommodations: Explore the world with Booking.com. Big savings on homes, hotels, flights, car rentals, taxis, and attractions – build your perfect trip on any budget.

Sharp, squared-off controls, one soft shadow for depth, restrained display type at 24px / 700, a single blue accent on neutrals. The site ships in light mode by default. Measured from 2834 rendered elements at 1440px wide on 2026-09-28.

Reference screenshots live beside this file; look at them before writing any layout, they carry the composition, density and image treatment that tokens cannot:

- `screenshots/desktop-1440-fold.png`: Desktop 1440, above the fold
- `screenshots/desktop-1440-full.jpg`: Desktop 1440, full page
- `screenshots/laptop-1024-fold.png`: Laptop 1024, above the fold
- `screenshots/tablet-768-fold.png`: Tablet 768, above the fold
- `screenshots/phone-390-fold.png`: Phone 390, above the fold
- `screenshots/phone-390-full.jpg`: Phone 390, full page

## Colors

| Token | Value | Use |
| --- | --- | --- |
| background | `#ffffff` | Page background |
| surface | `#e7e7e7` | Cards, panels, raised or recessed surfaces |
| foreground | `#1a1a1a` | Primary text |
| muted-foreground | `#595959` | Secondary text, captions |
| primary | `#003b95` | Accent: primary buttons, links, focus |
| on-primary | `#ffffff` | Text on the accent |
| secondary | `#ffb700` | Secondary accent (yellow) |
| border | `#e7e7e7` | Hairlines, dividers, input borders |

Full painted palette by area (largest first): `#ffffff`, `#767676`, `#000000`, `#003b95`, `#ffb700`, `#595959`, `#e7e7e7`.

Gradients in use: `linear-gradient(90deg, rgb(0, 0, 0) 0px, rgba(0, 0, 0, 0) 11.5%), linear-gradient(270deg, rgb(0, 0, 0) 0px, rgba(0, 0, 0, 0) 11.5%)`; `linear-gradient(0deg, rgba(0, 0, 0, 0.44) 0%, rgba(0, 0, 0, 0.51) 13.81%, rgba(0, 0, 0, 0.58) 28.27%, rgba(0, 0, 0, 0.65) 42.12%, rgba(0, 0, 0, 0.7) 56.28%, rgb`.

The accent `#003b95` is used sparingly: primary buttons, links and focus rings. Everything else stays neutral.

## Typography

- **Avenir Next** for h1, h2: unknown source; use **Nunito** as the stand-in if it does not load.
- **BlinkMacSystemFont** for h3, body, label, button: system font stack.

| Role | Family | Size | Weight | Line height | Tracking |
| --- | --- | --- | --- | --- | --- |
| headline-display | Avenir Next | 24px | 700 | 1.33 | normal |
| headline-lg | Avenir Next | 24px | 700 | 1.33 | normal |
| headline-md | BlinkMacSystemFont | 16px | 700 | 1.5 | normal |
| body-md | BlinkMacSystemFont | 14px | 400 | 1.43 | normal |
| label-md | BlinkMacSystemFont | 12px | 400 | 1.17 | normal |
| button | BlinkMacSystemFont | 14px | 500 | 1.43 | normal |

Type scale in use: 12px, 14px, 16px, 20px, 24px. Base body size 14px.

The H1 renders at 24px / 700, start aligned, up to 600px wide. Sample: "Earn $150in Travel Credits".

## Layout

- Spacing unit: 4px. Scale in use: 4, 8, 12, 16, 24 (px).
- Flex and grid gaps: 4, 8, 12, 16, 24, 32 px.
- Content max width: 1108px, centred.
- Breakpoints: 550px, 575px, 576px, 1024px, 1280px.
- Header: 124px tall, static, background `rgb(0, 59, 149)`; 12 nav links at 14px / 500 (List your property · Register · Sign in · Stays · Flights · Flight + Hotel · Car rental · Cruises).

## Elevation & Depth

Shadows in use, most common first:

- shadow-1: `rgba(26, 26, 26, 0.16) 0px 2px 8px 0px`

## Shapes

- Buttons: 4px
- Inputs: 4px
- Cards and panels: 8px
- Images and media: 0px
- Radius scale: none 0px, sm 4px, md 8px, full 9999px

## Components

### Button, ghost

Background transparent (it sits on `#003b95`, so place it on that colour), text `#ffffff`, border none, radius 4px, height 48px, padding 8px 12px, 16px / 500. Sample label: "USD".

### Button, secondary

Background `#ffffff`, text `#006ce4`, border none, radius 4px, height 36px, padding 4px 12px, 14px / 500. Sample label: "Register".

### Card

Background `transparent`, border none, radius 8px, padding 0px, shadow `rgba(26, 26, 26, 0.16) 0px 2px 8px 0px`. Typical size about 265×382px.

### Link

Colour `#ffffff`, no underline at rest, weight 500.

## Dark Mode

No dark mode responded to prefers-color-scheme, a theme toggle, or a root class/attribute.

## Responsive Behavior

| Viewport | Content width | Gutter | Body | H1 | Header | Hero | Grids | Buttons |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| desktop 1440px | 1108px | 170px | 14px | 24px, 4 lines, start | 124px, 10 links, 2 CTA | media behind/overlapping text | 5→1 col; 2→1 col; 2→2 col | content-width |
| laptop 1024px | 992px | 5px | 14px | 24px, 4 lines, start | 124px, 10 links, 2 CTA | media behind/overlapping text | 2→2 col; 2→2 col; 2→2 col | content-width |
| tablet 768px | 736px | 5px | 14px | 24px, 4 lines, start | 116px, hamburger (Menu) | media behind/overlapping text | 2→2 col; 2→2 col; 2→2 col | 3 full-width |
| phone 390px | 358px | 5px | 14px | 24px, 3 lines, start | 116px, hamburger (Menu) | media behind/overlapping text | 2→2 col; 2→2 col; 2→2 col | 6 full-width |

- H1 goes 24px → 24px (100%), 4 → 3 lines.
- Nav collapses to a hamburger by 390px (first seen at 768px); header 124px → 116px.
- Card grids: 3 columns → 3 columns on phones (gap normal → normal).
- Body text stays 14px at every width.
- Phone side gutter 5px.
- 6 buttons stretch full-width on phones.

## Interaction & Motion

56 elements carry transitions; typical 0.12s with cubic-bezier(0.2, 0, 0.4, 0.8), mostly on transform, background-color, border-color. 1 running keyframe animations (onetrust-fade-in 0.4s 1).

- Hover on button-primary ("Register"): no visible change; cursor pointer; transition transform | 0.12s | cubic-bezier(0.2, 0, 0.4, 0.8).
- Hover on button-secondary ("Stays"): no visible change; cursor pointer; transition border-color, background-color | 0.12s | cubic-bezier(0.2, 0, 0.4, 0.8).
- Hover on nav-link ("List your property"): no visible change; cursor pointer; transition transform | 0.12s | cubic-bezier(0.2, 0, 0.4, 0.8).
- Hover on body-link ("Explore the card"): no visible change; cursor pointer; transition transform | 0.12s | cubic-bezier(0.2, 0, 0.4, 0.8).
- Hover on input: no visible change; cursor text.
- Focus on button-primary: element did not take focus.
- Focus on body-link: element did not take focus.
- Focus on input: element did not take focus.
- Tooltip triggers exist (1 × aria-describedby, 214 × title) but none opened on hover in the first viewport; title attributes fall back to the browser's native tooltip.
- 12 aria-haspopup triggers exist; none opened on hover (click-to-open menus).
- No scroll-reveal: content is visible without scrolling into view.

Full detail (every overlay, table, form, scroll and text rule measured) is in `BEHAVIOR.md`; raw evidence in `evidence.json`.

## Do's and Don'ts

- Do use 4px multiples for every padding, margin and gap; the site does not use odd values.
- Do reserve `#003b95` for actions and focus; never paint large areas with it.
- Do keep body text at 14px in BlinkMacSystemFont and headings in Avenir Next.
- Do match corner radii per element class (buttons 4px, cards 8px); do not pick one radius for everything.
- Do use the measured shadows above; do not invent heavier ones.
- Don't substitute a different accent hue or introduce gradients that are not listed above.
- Don't rebuild from the tokens alone; open the screenshots for composition, density and image treatment.