Readwise UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces
• Creating Readwise-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 #3C78C1 for primary actions and focus states (accent)
• SHOULD reduce color palette (currently 24 colors detected)
• 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	#3C78C1	rgb(60,120,193)	Cards, modals, raised surfaces
surface-overlay	#F7EFA0	rgb(247,239,160)	Overlays, tooltips, dropdowns
text-primary	#323232	rgb(50,50,50)	Headings, body text
text-secondary	#83B2E7	rgb(131,178,231)	Secondary, muted text
text-tertiary	#A3995D	rgb(163,153,93)	Additional text
border-default	#2165BC	rgb(33,101,188)	Subtle borders, dividers
accent	#3C78C1	rgb(60,120,193)	Primary actions, links, focus
warning	#F4CF8F	rgb(244,207,143)	Warning states, cautions
destructive	#F0791E	rgb(240,121,30)	Error states, delete actions

Typography

• MUST use Inter as primary font family
• SHOULD use single font family for consistency
• MUST use 48px / 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	48px	700	#383938	1
text-38px	Inter	38px	extra_bold	#303030	1
body	Inter	28px	semi_bold	#313131	1
text-22px	Inter	22px	semi_bold	#323232	1
text-22px	Inter	22px	semi_bold	#383838	1
text-22px	Inter	22px	400	#4C4C4C	1
text-21px	Inter	21px	400	#635A37	1
text-18px	Inter	18px	semi_bold	#D5D5D5	1
text-16px	Inter	16px	400	#9D9D9C	1
text-14px	Inter	14px	400	#BDD8EF	1

Typography Reference

Font Families:

• Inter (used 49x)

Font Sizes: 5px, 6px, 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 16px, 18px, 21px, 22px, 28px, 38px, 48px

Spacing

• MUST use 4px grid for spacing
• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 7px, 8px
• SHOULD use 5px 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: 2px, 5px, 7px, 9px
• SHOULD limit border widths to: 1px, 2px
• SHOULD use 5px 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: 2px, 5px, 7px, 9px

Layout

• MUST design for 1920px base viewport width
• SHOULD use consistent element widths: 6px, 9px, 64px, 5px, 160px
• 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: 1080px
• Main Content: width: 1364px, height: 913px
• Main Content: width: 1364px, height: 903px
• Main Content: width: 963px, height: 569px
• Header: height: 66px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#83B2E7	none	-	-

Interactive States

Focus

• MUST use 2px outline with accent color (#3C78C1)
• MUST use 2px outline-offset
• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%
• Buttons (secondary): use #3C78C1 background
• List items: use #3C78C1 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