gumroad-ui-skills

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

SKILL.md

--- frontmatter

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

Gumroad UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

•MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 0
•MUST use #000000 as page background (surface-base)
•SHOULD reduce color palette (currently 16 colors detected)
•MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
`surface-base`	#000000	rgb(0,0,0)	Page background
`surface-raised`	#FDFEFE	rgb(253,254,254)	Cards, modals, raised surfaces
`surface-overlay`	#F0F1EB	rgb(240,241,235)	Overlays, tooltips, dropdowns
`text-primary`	#353535	rgb(53,53,53)	Headings, body text
`text-secondary`	#626262	rgb(98,98,98)	Secondary, muted text
`text-tertiary`	#1D1D1D	rgb(29,29,29)	Additional text
`border-default`	#2C2C2C	rgb(44,44,44)	Subtle borders, dividers

Typography

•MUST use Inter as primary font family
•SHOULD use single font family for consistency
•MUST use 92px / 700 for primary headings
•MUST use 18px / 400 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	92px	700	#181817	1
`text-33px`	Inter	33px	semi_bold	#1D1D1D	1
`text-30px`	Inter	30px	700	#151515	1
`text-25px`	Inter	25px	500	#1E1E1E	1
`text-22px`	Inter	22px	500	#353632	1
`text-20px`	Inter	20px	400	#353535	1
`text-19px`	Inter	19px	400	#C7C7C7	1
`body`	Inter	18px	400	#8A8B85	1
`body-secondary`	Inter	16px	400	#4B4B4B	2
`body-secondary`	Inter	16px	400	#B2B2B2	1

Typography Reference

Font Families:

•Inter (used 22x)

Font Sizes: 8px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 18px, 19px, 20px, 22px, 25px, 30px, 33px, 92px

Spacing

•MUST use 4px grid for spacing
•SHOULD use spacing from scale: 1px, 2px, 5px, 6px
•SHOULD use 6px 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: 16px, 19px, 21px, 22px, 23px
•SHOULD use 21px+ radius for pill-shaped elements
•SHOULD limit border widths to: 1px, 2px
•SHOULD use 19px 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: 16px, 19px, 21px, 22px, 23px

Layout

•MUST design for 1920px base viewport width
•SHOULD use consistent element widths: 16px, 730px, 246px, 31px, 196px
•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

•Header: height: 81px
•Main Content: width: 1920px, height: 997px
•Main Content: width: 1920px, height: 1001px
•Header: height: 78px

Components

•MUST use 0px height for input fields

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#C7C7C7	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 #FDFEFE background
•List items: use #FDFEFE 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