Claude Anthropic Design System

Claude / Anthropic 风格设计系统

What's inside

• DESIGN.md defines the source-backed visual rules.
• colors_and_type.css provides reusable tokens.
• BRAND.md and PROVENANCE.json describe the optimized package version, preserved assets, and measured/inferred evidence boundary.
• SYSTEM-MANIFEST.json records stable read order, file roles, and invariants.
• fonts/, logos/, and imagery/ contain preserved official source assets from sampled Anthropic pages.
• preview/ contains focused review cards.
• examples/ contains detail and page-level usage examples; examples/examples.css is the shared fixture component layer.
• system/kit.html and ui_kits/app/index.html show applied components.

Source Context

The system is based on the pasted Anthropic-style DESIGN.md plus Anthropic public CSS sampling recorded in anthropic-official-colors.md.

Source-backed evidence:

• Ivory surface ladder: #faf9f5, #f0eee6, #e8e6dc
• Slate action system: #141413, #3d3d3a
• Clay accent: #d97757, sparse use only
• Header interaction: underline hover and caret rotation
• Focus ring: #2c84db
• Local official webfont files: fonts/ contains Anthropic Sans / Serif / Mono.
• Asset manifest: source_examples/official-source-manifest.json.
• Inference boundary: #6ea100 is measured in source CSS and assigned here as success semantics, but it is not claimed as an official named success token.

When to use this skill

Use it to design prototypes, mockups, interfaces, production artifacts, dashboards, forms, decks, and product shells that need a Claude / Anthropic visual language.

How to use

• Read DESIGN.md.
• Load colors_and_type.css.
• Check SYSTEM-MANIFEST.json for stable package structure.
• Check PROVENANCE.json when a value needs source proof.
• Start from Ivory surfaces: page #faf9f5, components #f0eee6, hover/selected #e8e6dc; dropdowns inherit the owning trigger/nav background.
• Use Slate Dark #141413 for primary actions.
• Use Clay #d97757 only for sparse emphasis.
• Verify against preview/*.html.
• Use examples/index.html for concrete details and full-page examples.

10. Do not fork nav, dropdown, button, route-tab, sidebar, or color-library logic per page; reuse examples/examples.css patterns.

Highlights

• Colors: warm paper surface ladder.
• Typography: Serif display, Sans UI, Mono code.
• Spacing: 4px / 8px baseline grid.
• Radius: 8px standard cards, 12px controls.
• Layout: reading-first, bordered, low-shadow surfaces.
• Interaction: header hover uses underline and caret rotation.
• Header hover uses underline and caret rotation.
• Dropdowns inherit the owning trigger/nav theme background, open on hover/focus, and use subtle borders/shadow.
• Claude.com details: use-cases card hover, pricing route tabs, Batch processing switch, startups language picker, and Contact sales / Read more button hierarchy are captured in examples.
• Sidebar system: light rails use warm borders and Slate active states; dark overlay sidebars use Slate dark, Ivory text, and deep Slate borders.
• Numerics: prices, counts, dates, percentages, and table metrics use the mono stack with tabular numbers.
• No Ant Design default blue/green/yellow/red defaults.

Examples

• Detail examples: examples/details-surface-layers.html, details-color-library.html, details-hover-motion.html, details-scroll-route-motion.html, details-buttons-links.html, details-claude-official-interactions.html, details-sidebar-system.html, details-forms-focus.html, details-status-data.html, details-typography-cn-en.html.
• Page examples: examples/page-landing.html, page-research.html, page-newsroom.html, page-company.html, page-console.html, page-login.html, page-settings-form.html.
• Start with examples/index.html when you need to see the system applied before designing.

Reuse workflow

Use this package when creating or revising an Open Design artifact:

• Read DESIGN.md before authoring.
• Import colors_and_type.css or copy its :root tokens.
• Check preview/colors-usage.html for layer order. Check preview/assets-provenance.html for preserved fonts/icons/images.
• Check preview/components-buttons.html before shipping CTA-heavy screens.
• Check preview/navigation-menus.html for topbar and dropdown behavior.
• Check preview/claude-interactions.html for Claude.com-specific button, switch, card, language picker, and route behavior.
• Check the matching examples/page-*.html before shipping a full page.

Implementation Details

• Smooth scrolling is part of the system: keep html { scroll-behavior: smooth; } and disable it in prefers-reduced-motion.
• Product dropdowns use .nav-demo > .nav-item + .nav-demo-panel .mega; production opens on hover/focus-within, while .is-open is only for inspection fixtures.
• Carets use the shared .caret SVG mask and rotate exactly 180deg; never hand-build arrow borders.
• Route switching uses .route-tabs, .route-panels, and overlapping .route-panel children. Toggle only aria-selected and .active; the CSS handles opacity + translateY. Use examples/details-scroll-route-motion.html as the visible fixture for smooth scrolling and route transitions.
• Buttons use the shared .btn variants and official double-ring hover model. Do not substitute color-swap hover.
• Sidebars use details-sidebar-system.html as the source pattern; docs sidebars follow page scroll and do not get independent persistent scrollbars.
• Prices, dates, token counts, percentages, and table metrics use .numeric.