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