hugging-face-ui-skills

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