Webflow UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

• MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 8
• MUST use #151515 as page background (surface-base)
• MUST use #8DB8F2 for primary actions and focus states (accent)
• SHOULD reduce color palette (currently 33 colors detected)
• MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token	HEX	RGB	Usage
surface-base	#151515	rgb(21,21,21)	Page background
surface-raised	#1252F1	rgb(18,82,241)	Cards, modals, raised surfaces
surface-overlay	#FFFFFF	rgb(255,255,255)	Overlays, tooltips, dropdowns
text-primary	#505050	rgb(80,80,80)	Headings, body text
text-secondary	#383838	rgb(56,56,56)	Secondary, muted text
text-tertiary	#2A5090	rgb(42,80,144)	Additional text
border-default	#0E0E0E	rgb(14,14,14)	Subtle borders, dividers
accent	#8DB8F2	rgb(141,184,242)	Primary actions, links, focus
destructive	#855C37	rgb(133,92,55)	Error states, delete actions

Typography

• MUST use Inter as primary font family
• SHOULD use single font family for consistency
• MUST use 62px / 700 for primary headings
• MUST use 28px / semi_bold for body text
• SHOULD reduce font weights (currently 5 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	62px	700	#171719	1
text-52px	Inter	52px	700	#969395	1
text-52px	Inter	52px	700	#958B81	1
body	Inter	28px	semi_bold	#82736E	1
text-24px	Inter	24px	400	#999999	1
text-23px	Inter	23px	semi_bold	#C8C8C8	1
text-20px	Inter	20px	semi_bold	#BEBEBE	1
text-20px	Inter	20px	500	#B4B3B3	1
text-20px	Inter	20px	400	#4E525C	1
text-19px	Inter	19px	500	#A9A9A9	1

Typography Reference

Font Families:

• Inter (used 71x)

Font Sizes: 3px, 5px, 6px, 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 17px, 18px, 19px, 20px, 23px, 24px, 28px, 52px, 62px

Spacing

• MUST use 4px grid for spacing
• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 7px, 9px, 13px
• 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: 1px, 2px, 3px, 18px
• SHOULD limit border widths to: 1px, 2px
• SHOULD use 2px 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: 1px, 2px, 3px, 18px

Layout

• MUST design for 1920px base viewport width
• SHOULD use consistent element widths: 49px, 27px, 107px, 21px, 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: 1920px, height: 620px
• Main Content: width: 1693px, height: 623px
• Header: height: 64px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#505050	none	-	-

Interactive States

Focus

• MUST use 2px outline with accent color (#8DB8F2)
• MUST use 2px outline-offset
• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%
• Buttons (secondary): use #1252F1 background
• List items: use #1252F1 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