Supabase UI Skills

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

When to Apply

Reference these guidelines when:

• Building dark-mode interfaces

• Creating Supabase-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 7

• MUST use #121212 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

#121212 rgb(18,18,18) Page background

surface-raised

#000000 rgb(0,0,0) Cards, modals, raised surfaces

surface-overlay

#0A502B rgb(10,80,43) Overlays, tooltips, dropdowns

text-primary

#525252 rgb(82,82,82) Headings, body text

text-2

#9C9C9C rgb(156,156,156) Additional text

text-secondary

#323232 rgb(50,50,50) Secondary, muted text

border-default

#1A1A1A rgb(26,26,26) Subtle borders, dividers

success

#3DB576 rgb(61,181,118) Success states, confirmations

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 56px / 700 for primary headings

• MUST use 15px / 400 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 56px 700 #E9E9E9 1

heading-2

Inter 55px 700 #3DB576 1

text-21px

Inter 21px 500 #A2A2A2 1

text-16px

Inter 16px 500 #3C3C3C 1

text-16px

Inter 16px 500 #383838 1

text-16px

Inter 16px 500 #393939 1

text-16px

Inter 16px 400 #AAAAAA 1

body

Inter 15px 400 #9C9C9C 1

body-secondary

Inter 15px 400 #444444 1

body-secondary

Inter 15px 400 #A8A8A8 1

Typography Reference

Font Families:

• Inter (used 38x)

Font Sizes: 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 21px, 55px, 56px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 3px, 4px, 5px, 6px, 16px, 40px, 61px

• SHOULD use 3px 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: 3px, 4px, 5px, 6px, 7px, 9px, 10px, 13px, 16px

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

• SHOULD use 3px 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: 3px, 4px, 5px, 6px, 7px, 9px, 10px, 13px, 16px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 8px, 17px, 52px, 162px, 158px

• 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: 66px

• Main Content: width: 1920px, height: 1014px

• Main Content: width: 1920px, height: 1020px

• Header: height: 63px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #4B7D64 none

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 #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