Hugging Face UI Skills

Opinionated constraints for building Hugging Face-style interfaces with AI agents.

When to Apply

Reference these guidelines when:

• Building dark-mode interfaces

• Creating Hugging Face-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 #0D1119 as page background (surface-base )

• SHOULD reduce color palette (currently 13 colors detected)

• MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token HEX RGB Usage

surface-base

#0D1119 rgb(13,17,25) Page background

surface-raised

#FFFFFF rgb(255,255,255) Cards, modals, raised surfaces

surface-overlay

#171D2A rgb(23,29,42) Overlays, tooltips, dropdowns

text-primary

#3D3D3D rgb(61,61,61) Headings, body text

text-secondary

#909199 rgb(144,145,153) Secondary, muted text

text-tertiary

#4F4F57 rgb(79,79,87) Additional text

border-default

#0B0F16 rgb(11,15,22) Subtle borders, dividers

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 61px / 700 for primary headings

• MUST use 15px / 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 61px 700 #E5E6E7 1

text-18px

Inter 18px 500 #303030 1

text-17px

Inter 17px 500 #3B3B3B 1

text-17px

Inter 17px 400 #A9ACB1 1

text-17px

Inter 17px 400 #65676F 1

body

Inter 15px 500 #353535 1

body-secondary

Inter 14px 400 #525252 2

body-secondary

Inter 14px 400 #3C3C3C 1

body-secondary

Inter 14px 500 #383838 1

body-secondary

Inter 14px 400 #7F848C 1

Typography Reference

Font Families:

• Inter (used 106x)

Font Sizes: 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 17px, 18px, 61px

Spacing

• MUST use 4px grid for spacing

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

• SHOULD use 2px 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: 0px, 2px, 3px, 4px, 5px, 6px, 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 21px

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

• SHOULD limit border widths to: 1px, 2px, 5px

• SHOULD use 4px 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: 0px, 2px, 3px, 4px, 5px, 6px, 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 21px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 12px, 10px, 14px, 9px, 11px

• 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: 1510px, height: 754px

• Main Content: width: 1103px, height: 796px

• Header: height: 60px

Components

• MUST use 0px height for input fields

Buttons

Variant Background Text Border Height Radius

Ghost transparent #777B84 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 #FFFFFF background

• List items: use #FFFFFF 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