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apple-ui-skills

Apple's UI design system. Use when building interfaces inspired by Apple's aesthetic - light mode, Inter font, 4px grid.

personAuthor: jakexiaohubgithub
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Apple UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

  • SHOULD use light backgrounds for primary surfaces
  • MUST use #FFFFFF as page background (surface-base)
  • MUST use #155BD0 for primary actions and focus states (accent)
  • SHOULD limit color palette to 10 distinct colors
  • MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

| Token | HEX | RGB | Usage | |-------|-----|-----|-------| | surface-base | #FFFFFF | rgb(255,255,255) | Page background | | surface-raised | #0858DC | rgb(8,88,220) | Cards, modals, raised surfaces | | text-primary | #808080 | rgb(128,128,128) | Headings, body text | | text-secondary | #6D89B5 | rgb(109,137,181) | Secondary, muted text | | text-tertiary | #90C5F1 | rgb(144,197,241) | Additional text | | border-default | #B5C7D8 | rgb(181,199,216) | Subtle borders, dividers | | accent | #155BD0 | rgb(21,91,208) | Primary actions, links, focus |

Typography

  • MUST use Inter as primary font family
  • SHOULD use single font family for consistency
  • MUST use 51px / 700 for primary headings
  • MUST use 27px / 500 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 | 51px | 700 | #2D2B30 | 1 | | text-43px | Inter | 43px | 700 | #272729 | 1 | | body | Inter | 27px | 500 | #454547 | 1 | | body-secondary | Inter | 26px | 500 | #3D3C41 | 1 | | text-16px | Inter | 16px | 400 | #6D89B5 | 1 | | text-15px | Inter | 15px | 400 | #8EC7F2 | 1 | | text-14px | Inter | 14px | 400 | #90C5F1 | 1 | | text-12px | Inter | 12px | 300 | #808080 | 1 | | caption | Inter | 11px | 300 | #707070 | 1 | | label | Inter | 10px | 400 | #7E7E7E | 1 |

Typography Reference

Font Families:

  • Inter (used 18x)

Font Sizes: 9px, 10px, 11px, 12px, 14px, 15px, 16px, 26px, 27px, 43px, 51px

Spacing

  • MUST use 4px grid for spacing
  • SHOULD use spacing from scale: 2px, 4px, 13px, 34px
  • 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: 21px
  • SHOULD use 21px+ radius for pill-shaped elements
  • MUST use 1px border width consistently
  • SHOULD use 21px 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: 21px

Layout

  • MUST design for 1920px base viewport width
  • SHOULD use consistent element widths: 46px, 50px, 36px, 47px, 32px
  • 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: 43px
  • Main Content: width: 1920px, height: 694px
  • Main Content: width: 1920px, height: 695px

Components

Buttons

| Variant | Background | Text | Border | Height | Radius | |---------|------------|------|--------|--------|--------| | Ghost | transparent | #6D89B5 | none | - | - |

Interactive States

Focus

  • MUST use 2px outline with accent color (#155BD0)
  • MUST use 2px outline-offset
  • NEVER remove focus indicators

Hover

  • Buttons (primary): lighten background by 10%
  • Buttons (secondary): use #0858DC background
  • List items: use #0858DC 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