Spotify UI Skills

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

When to Apply

Reference these guidelines when:

• Building dark-mode interfaces

• Creating Spotify-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 9

• MUST use #171717 as page background (surface-base )

• MUST use #010002 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

#171717 rgb(23,23,23) Page background

surface-raised

#FEFEFE rgb(254,254,254) Cards, modals, raised surfaces

surface-overlay

#010002 rgb(1,0,2) Overlays, tooltips, dropdowns

text-primary

#555555 rgb(85,85,85) Headings, body text

text-secondary

#6A6A6A rgb(106,106,106) Secondary, muted text

text-tertiary

#AEAEAE rgb(174,174,174) Additional text

border-default

#838486 rgb(131,132,134) Subtle borders, dividers

accent

#010002 rgb(1,0,2) Primary actions, links, focus

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 41px / 500 for primary headings

• MUST use 13px / 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 41px 500 #2D2D2D 1

text-24px

Inter 24px semi_bold #DBDBDB 1

text-24px

Inter 24px 500 #DBDBDB 1

text-24px

Inter 24px semi_bold #DCDCDC 1

text-17px

Inter 17px 400 #676667 1

text-16px

Inter 16px 400 #A6A6A6 1

text-15px

Inter 15px 400 #AEAEAE 1

text-15px

Inter 15px 400 #6B6B6B 1

text-15px

Inter 15px 400 #A4A4A4 1

text-15px

Inter 15px 400 #717171 1

Typography Reference

Font Families:

• Inter (used 81x)

Font Sizes: 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 17px, 24px, 41px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 7px, 8px

• SHOULD use 5px 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: 10px, 15px, 17px, 18px, 22px, 24px

• SHOULD use 22px+ radius for pill-shaped elements

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

• SHOULD use 15px 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: 10px, 15px, 17px, 18px, 22px, 24px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 172px, 68px, 171px, 185px, 38px

• 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: 1080px

• Header: height: 60px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #B8B8B8 none

Interactive States

Focus

• MUST use 2px outline with accent color (#010002 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #FEFEFE background

• List items: use #FEFEFE 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