github-ui-skills

GitHub 的 UI 设计系统。在构建受 GitHub 美学启发的界面时使用——深色模式、Inter 字体、4px 网格。

SKILL.md

--- frontmatter

name: github-ui-skills
description: GitHub's UI design system. Use when building interfaces inspired by GitHub's aesthetic - dark mode, Inter font, 4px grid.
license: MIT
metadata:
  author: design-skills
  version: "1.0.0"
  source: https://github.com

GitHub UI Skills

Opinionated constraints for building GitHub-style interfaces with AI agents.

When to Apply

Reference these guidelines when:

•Building dark-mode interfaces
•Creating GitHub-inspired design systems
•Implementing UIs with Inter font and 4px grid

Colors

•MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 12
•MUST use #10131A as page background (surface-base)
•MUST use #030036 for primary actions and focus states (accent)
•SHOULD reduce color palette (currently 23 colors detected)
•MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#10131A	rgb(16,19,26)	Page background
`surface-raised`	#11122F	rgb(17,18,47)	Cards, modals, raised surfaces
`surface-overlay`	#186D29	rgb(24,109,41)	Overlays, tooltips, dropdowns
`text-primary`	#878A91	rgb(135,138,145)	Headings, body text
`text-secondary`	#74777E	rgb(116,119,126)	Secondary, muted text
`text-tertiary`	#525C71	rgb(82,92,113)	Additional text
`border-default`	#1A1835	rgb(26,24,53)	Subtle borders, dividers
`success`	#A3D4AD	rgb(163,212,173)	Success states, confirmations
`accent`	#030036	rgb(3,0,54)	Primary actions, links, focus

Typography

•MUST use Inter as primary font family
•SHOULD use single font family for consistency
•MUST use 53px / 700 for primary headings
•MUST use 29px / 400 for body text
•MUST limit font weights to: regular, bold, light
•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	53px	700	#E3E4EA	1
`body`	Inter	29px	400	#606A7A	1
`text-18px`	Inter	18px	400	#A7A8BF	1
`text-16px`	Inter	16px	300	#989BA2	1
`text-15px`	Inter	15px	300	#3F4249	1
`text-15px`	Inter	15px	400	#7F848A	1
`text-15px`	Inter	15px	400	#B5B6C4	1
`text-15px`	Inter	15px	400	#A3D4AD	1
`text-15px`	Inter	15px	400	#6B6B71	1
`text-15px`	Inter	15px	400	#9796B1	1

Typography Reference

Font Families:

•Inter (used 54x)

Font Sizes: 4px, 5px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 18px, 29px, 53px

Spacing

•MUST use 4px grid for spacing
•SHOULD use spacing from scale: 2px, 3px, 4px, 5px, 6px, 8px, 11px, 14px
•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, 4px, 5px, 9px, 15px, 22px, 29px
•SHOULD use 22px+ radius for pill-shaped elements
•SHOULD limit border widths to: 1px, 2px, 3px, 4px
•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, 4px, 5px, 9px, 15px, 22px, 29px

Layout

•MUST design for 1920px base viewport width
•SHOULD use consistent element widths: 10px, 9px, 11px, 28px, 21px
•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: 1080px
•Main Content: width: 1920px, height: 1004px
•Header: height: 64px

Components

•MUST use 0px height for input fields

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#B5B6C4	none	-	-

Inputs

•Height: 0px

Interactive States

Focus

•MUST use 2px outline with accent color (#030036)
•MUST use 2px outline-offset
•NEVER remove focus indicators

Hover

•Buttons (primary): lighten background by 10%
•Buttons (secondary): use #11122F background
•List items: use #11122F 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