Lemonsqueezy UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces

• Creating Lemonsqueezy-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• SHOULD use light backgrounds for primary surfaces

• MUST use #FEFEFE as page background (surface-base )

• MUST use #9368E3 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

#FEFEFE rgb(254,254,254) Page background

surface-raised

#3F01DF rgb(63,1,223) Cards, modals, raised surfaces

text-primary

#D0B4F4 rgb(208,180,244) Headings, body text

text-2

#4F4F50 rgb(79,79,80) Additional text

text-secondary

#8550F5 rgb(133,80,245) Secondary, muted text

border-default

#9368E3 rgb(147,104,227) Subtle borders, dividers

accent

#9368E3 rgb(147,104,227) Primary actions, links, focus

warning

#FCD995 rgb(252,217,149) Warning states, cautions

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 74px / 700 for primary headings

• MUST use 31px / semi_bold for body text

• SHOULD reduce font weights (currently 4 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 74px 700 #F1E8F9 1

body

Inter 31px semi_bold #E2D2F8 1

text-25px

Inter 25px semi_bold #E0CDF6 1

text-25px

Inter 25px semi_bold #E2D1F8 1

text-25px

Inter 25px semi_bold #DAC6F6 1

text-22px

Inter 22px 500 #D0B4F4 1

text-18px

Inter 18px 400 #8A59F2 1

text-15px

Inter 15px 400 #8A56F5 1

text-15px

Inter 15px 400 #8955F5 1

text-15px

Inter 15px 400 #794D14 1

Typography Reference

Font Families:

• Inter (used 18x)

Font Sizes: 11px, 12px, 13px, 14px, 15px, 18px, 22px, 25px, 31px, 74px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 2px, 3px, 4px, 5px, 6px, 15px, 16px, 17px

• SHOULD use 4px 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: 17px, 21px, 29px

• SHOULD use 21px+ radius for pill-shaped elements

• SHOULD limit border widths to: 1px, 2px

• SHOULD use 29px 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: 17px, 21px, 29px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 30px, 12px, 145px, 88px, 8px

• 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: 1002px

• Main Content: width: 1920px, height: 998px

• Header: height: 69px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #D0B4F4 none

Interactive States

Focus

• MUST use 2px outline with accent color (#9368E3 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #3F01DF background

• List items: use #3F01DF 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