segment-ui-skills

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

SKILL.md

--- frontmatter

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

Segment UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

•SHOULD use light backgrounds for primary surfaces
•MUST use #0748D8 as page background (surface-base)
•MUST use #94C2F0 for primary actions and focus states (accent)
•SHOULD reduce color palette (currently 14 colors detected)
•MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#0748D8	rgb(7,72,216)	Page background
`surface-raised`	#000000	rgb(0,0,0)	Cards, modals, raised surfaces
`surface-overlay`	#0F1423	rgb(15,20,35)	Overlays, tooltips, dropdowns
`text-primary`	#2F3239	rgb(47,50,57)	Headings, body text
`text-2`	#424856	rgb(66,72,86)	Additional text
`text-secondary`	#94C2F0	rgb(148,194,240)	Secondary, muted text
`border-default`	#1148C1	rgb(17,72,193)	Subtle borders, dividers
`accent`	#94C2F0	rgb(148,194,240)	Primary actions, links, focus

Typography

•MUST use Inter as primary font family
•SHOULD use single font family for consistency
•MUST use 50px / 700 for primary headings
•MUST use 31px / 500 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	50px	700	#E1E4E6	1
`heading-2`	Inter	46px	semi_bold	#2F3239	1
`heading-3`	Inter	46px	700	#222730	1
`body`	Inter	31px	500	#2D2C41	1
`text-21px`	Inter	21px	400	#B1B7C2	1
`text-18px`	Inter	18px	400	#54575E	1
`text-16px`	Inter	16px	300	#87A1D0	1
`text-15px`	Inter	15px	400	#5F6165	1
`text-15px`	Inter	15px	400	#484A50	1
`text-15px`	Inter	15px	400	#52545B	1

Typography Reference

Font Families:

•Inter (used 20x)

Font Sizes: 5px, 10px, 13px, 14px, 15px, 16px, 18px, 21px, 31px, 46px, 50px

Spacing

•MUST use 4px grid for spacing
•SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 16px, 18px, 78px
•SHOULD use 2px 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: 6px, 7px
•MUST use 1px border width consistently
•SHOULD use 6px 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: 6px, 7px

Layout

•MUST design for 1920px base viewport width
•SHOULD use consistent element widths: 8px, 248px, 11px, 476px, 96px
•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: 545px
•Main Content: width: 1920px, height: 543px
•Header: height: 44px
•Header: height: 55px
•Header: height: 53px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#94C2F0	none	-	-

Interactive States

Focus

•MUST use 2px outline with accent color (#94C2F0)
•MUST use 2px outline-offset
•NEVER remove focus indicators

Hover

•Buttons (primary): lighten background by 10%
•Buttons (secondary): use #000000 background
•List items: use #000000 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