vercel-ui-skills

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

SKILL.md

--- frontmatter

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

Vercel UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

•SHOULD use light backgrounds for primary surfaces
•MUST use #F9F9F9 as page background (surface-base)
•MUST use #000001 for primary actions and focus states (accent)
•SHOULD reduce color palette (currently 12 colors detected)
•MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#F9F9F9	rgb(249,249,249)	Page background
`surface-raised`	#111111	rgb(17,17,17)	Cards, modals, raised surfaces
`surface-overlay`	#000001	rgb(0,0,1)	Overlays, tooltips, dropdowns
`text-primary`	#797979	rgb(121,121,121)	Headings, body text
`text-secondary`	#929292	rgb(146,146,146)	Secondary, muted text
`text-tertiary`	#1B1B1B	rgb(27,27,27)	Additional text
`border-default`	#C8CDD1	rgb(200,205,209)	Subtle borders, dividers
`accent`	#000001	rgb(0,0,1)	Primary actions, links, focus

Typography

•MUST use Inter as primary font family
•SHOULD use single font family for consistency
•MUST use 44px / extra_bold for primary headings
•MUST use 29px / 700 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	44px	extra_bold	#383838	1
`body`	Inter	29px	700	#1B1B1B	1
`body-secondary`	Inter	28px	500	#717171	1
`text-25px`	Inter	25px	500	#828282	1
`text-24px`	Inter	24px	500	#797979	1
`text-24px`	Inter	24px	700	#1E1E1E	1
`text-23px`	Inter	23px	400	#6C6C6C	1
`text-20px`	Inter	20px	500	#262626	1
`text-18px`	Inter	18px	400	#797979	1
`text-18px`	Inter	18px	500	#373737	1

Typography Reference

Font Families:

•Inter (used 21x)

Font Sizes: 10px, 12px, 13px, 14px, 15px, 18px, 20px, 23px, 24px, 25px, 28px, 29px, 44px

Spacing

•MUST use 4px grid for spacing
•SHOULD use spacing from scale: 4px, 5px, 6px, 10px, 25px, 54px, 59px, 92px
•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: 5px, 6px, 7px, 22px, 23px
•SHOULD use 22px+ radius for pill-shaped elements
•SHOULD limit border widths to: 1px, 3px
•SHOULD use 23px 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: 5px, 6px, 7px, 22px, 23px

Layout

•MUST design for 1920px base viewport width
•SHOULD use consistent element widths: 8px, 181px, 66px
•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: 1511px, height: 790px
•Main Content: width: 1098px, height: 735px
•Header: height: 59px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#545454	none	-	-

Interactive States

Focus

•MUST use 2px outline with accent color (#000001)
•MUST use 2px outline-offset
•NEVER remove focus indicators

Hover

•Buttons (primary): lighten background by 10%
•Buttons (secondary): use #111111 background
•List items: use #111111 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