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