Claude — design system & UI screens

AI · 2 screens · 7 sections · claude.com

A long-scroll marketing landing page anchored by a serif headline and an inline auth card (social + email signup) on the left paired with a soft product UI preview on the right. Below the hero, a three-tier pricing comparison with a billing-audience toggle and checkmark feature lists leads into an accordion FAQ and a dense multi-column dark footer.

Open in Mozaika →

This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/website/claude.

Decoded design system

Claude's decoded design system: background #FAF9F5, text #141413, accent #141413, link #FF5F57, primary #C6613F; type scale h1 72px / h2 52px / body 23px; 4px spacing base; 6px base radius. The single interactive/action color is #141413 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#FAF9F5`
surface	`#ECEBE7`
border	`#D7D6D3`
text	`#141413`
text_muted	`#6B6B68`
primary	`#C6613F`
accent	`#141413`
link	`#FF5F57`
secondary	`#FEBC2E`
button_bg	`#141413`
button_text	`#FAF9F5`

Using these colors

Action color #141413 — the single interactive color; only on things you click or must notice, never large fills.
accent, button_bg are all #141413 — one role, not several (the action color).
accent #141413 — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
primary #C6613F — a brand color — but the call-to-action uses #141413, not this.
link #FF5F57 — fails contrast on the background (~2.8:1) — this is a dark UI color, NOT a readable link; use the text or action color for links (verify against the reference).
secondary #FEBC2E — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.

Typography

Heading: anthropicSerif
Body: anthropicSans
h1: 72px
h2: 52px
body: 23px

Spacing

base unit: 4px
scale: 2px, 4px, 6px, 8px, 12px, 16px, 20px, 24px, 28px, 32px

Radii

base: 6px
button: 8px

Shadow

rgb(20, 20, 19) 0px 0px 0px 0px

Shadows (elevation)

subtle: rgb(20, 20, 19) 0px 0px 0px 0px
card: rgba(0, 0, 0, 0.016) 0px 4px 24px 0px, rgba(0, 0, 0, 0.016) 0px 4px 32px 0px, rgba(0, 0, 0, 0.01) 0px 2px 64px 0px, rgba(0, 0, 0, 0.01) 0px 16px 32px 0px
overlay: color(srgb 0.85098 0.466667 0.341177 / 0.1) 0px 4px 20px 0px

Motion

Micro-interactions run at 200ms (dominant) with ease.

durations: 200ms · 100ms · 300ms
easings: ease · ease-in-out
animated properties: color, transform, opacity, background-color

Native design tokens

Token	Value
`--color-gray-000`	`#fff`
`--color-gray-050`	`#faf9f5`
`--color-gray-100`	`#f5f4ed`
`--color-gray-150`	`#f0eee6`
`--color-gray-200`	`#e8e6dc`
`--color-gray-250`	`#dedcd1`
`--color-gray-300`	`#d1cfc5`
`--color-gray-350`	`#c2c0b6`
`--color-gray-400`	`#b0aea5`
`--color-gray-450`	`#9c9a92`

…and 110 more measured on the page.

Button states (measured)

primary hover: box-shadow rgb(20, 20, 19) 0px 0px 0px 2px
primary focus: outline 2px solid rgb(44, 132, 219)

Layout (measured)

container max-width: 660px
nav: 84px fixed
common grid: 2 columns

Motion choreography (measured)

Load order: header.NavBar-module-scss-modul → span.LoginCard-module-scss-mo → span.Tabs-module-scss-module_ → span.Tabs-module-scss-module_ → main → main

Scroll reveal: 3 elements rest at opacity 0, animate in over 1s cubic-bezier(0.25, 1, 0.5, 1).

Stagger: span ×3 — 200ms apart.

Overlay recipe (measured)

dialog panel: rgba(0, 0, 0, 0) · radius 0px

Themes

dark counterpart: background #141413, text #FAF9F5.

Responsive (measured)

breakpoints: 566px · 600px · 768px · 833px · 900px · 991px
mobile (390px): hero 51px · nav hamburger

Full design system, per-section tokens & DESIGN.md / Tailwind / CSS exports →