anthropic-ui-skills
Anthropic's UI design system. Use when building interfaces inspired by Anthropic's aesthetic - light mode, Inter font, 4px grid.
What this skill does
# Anthropic UI Skills Opinionated constraints for building Anthropic-style interfaces with AI agents. ## When to Apply Reference these guidelines when: - Building light-mode interfaces - Creating Anthropic-inspired design systems - Implementing UIs with Inter font and 4px grid ## Colors - SHOULD use light backgrounds for primary surfaces - MUST use `#ECE9E0` as page background (`surface-base`) - SHOULD limit color palette to 8 distinct colors - MUST maintain text contrast ratio of at least 4.5:1 for accessibility ### Semantic Tokens | Token | HEX | RGB | Usage | |-------|-----|-----|-------| | `surface-base` | #ECE9E0 | rgb(236,233,224) | Page background | | `surface-raised` | #DBD1C0 | rgb(219,209,192) | Cards, modals, raised surfaces | | `surface-overlay` | #0F0F10 | rgb(15,15,16) | Overlays, tooltips, dropdowns | | `text-primary` | #625F59 | rgb(98,95,89) | Headings, body text | | `text-secondary` | #9F9F9C | rgb(159,159,156) | Secondary, muted text | | `text-tertiary` | #454036 | rgb(69,64,54) | Additional text | ## Typography - MUST use `Inter` as primary font family - SHOULD use single font family for consistency - MUST use `68px` / `700` for primary headings - MUST use `33px` / `semi_bold` for body text - SHOULD reduce font weights (currently 5 detected) - MUST use `text-balance` for headings and `text-pretty` for body text - SHOULD use `tabular-nums` for numeric data - NEVER modify letter-spacing unless explicitly requested ### Text Styles | Style | Font | Size | Weight | Color | Count | |-------|------|------|--------|-------|-------| | `heading-1` | Inter | 68px | 700 | #201F1D | 1 | | `body` | Inter | 33px | semi_bold | #35312A | 1 | | `text-23px` | Inter | 23px | 500 | #403D37 | 1 | | `text-21px` | Inter | 21px | 400 | #3D362C | 1 | | `text-21px` | Inter | 21px | 400 | #3B352B | 1 | | `text-20px` | Inter | 20px | 400 | #494237 | 1 | | `text-17px` | Inter | 17px | 500 | #423F3B | 1 | | `text-16px` | Inter | 16px | 400 | #454036 | 1 | | `text-14px` | Inter | 14px | 500 | #3F3931 | 1 | | `text-14px` | Inter | 14px | 400 | #A2A3A0 | 1 | ### Typography Reference **Font Families:** - `Inter` (used 16x) **Font Sizes:** 10px, 11px, 14px, 16px, 17px, 20px, 21px, 23px, 33px, 68px ## Spacing - MUST use 4px grid for spacing - SHOULD use spacing from scale: 3px, 4px, 5px, 6px - SHOULD use 5px as default gap between elements - NEVER use arbitrary spacing values (use design scale) - SHOULD maintain consistent padding within containers ## Borders - MUST use border-radius from scale: 3px, 15px - SHOULD use 3px as default border-radius - NEVER use arbitrary border-radius values (use design scale) - SHOULD use subtle borders (1px) for element separation ### Border Radius Reference **Scale:** 3px, 15px ## Layout - MUST design for 1920px base viewport width - SHOULD use consistent element widths: 10px, 18px, 146px, 579px - SHOULD maintain text-heavy layout with clear hierarchy - NEVER use `h-screen`, use `h-dvh` for full viewport height - MUST respect `safe-area-inset` for fixed elements - SHOULD use `size-*` for square elements instead of `w-*` + `h-*` ### Detected Layout Patterns - **Main Content**: width: 1920px, height: 1004px - **Main Content**: width: 1920px, height: 673px ## Components - MUST use `0px` height for input fields ### Buttons | Variant | Background | Text | Border | Height | Radius | |---------|------------|------|--------|--------|--------| | Ghost | transparent | #9F9F9C | none | - | - | ### Inputs - Height: `0px` ## Interactive States ### Focus - MUST use `2px` outline with accent color (`#5E6AD2`) - MUST use `2px` outline-offset - NEVER remove focus indicators ### Hover - Buttons (primary): lighten background by 10% - Buttons (secondary): use `#DBD1C0` background - List items: use `#DBD1C0` background ### Disabled - MUST use `opacity: 0.5` - MUST use `cursor: not-allowed` ## Interaction - MUST use an `AlertDialog` for destructive or irreversible actions - SHOULD use structural skeletons for loading states - MUST show errors next to where the action happens - NEVER block paste in `input` or `textarea` elements - MUST add an `aria-label` to icon-only buttons ## Animation - NEVER add animation unless it is explicitly requested - MUST animate only compositor props (`transform`, `opacity`) - NEVER animate layout properties (`width`, `height`, `top`, `left`, `margin`, `padding`) - SHOULD use `ease-out` on entrance animations - NEVER exceed `200ms` for interaction feedback - SHOULD respect `prefers-reduced-motion` ## Performance - NEVER animate large `blur()` or `backdrop-filter` surfaces - NEVER apply `will-change` outside an active animation - NEVER use `useEffect` for anything that can be expressed as render logic
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