launchdarkly-ui-skills

Launchdarkly UI Skills

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

When to Apply

Reference these guidelines when:

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

Colors

• MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 0
• MUST use #000000 as page background (surface-base)
• MUST use #AAB7F5 for primary actions and focus states (accent)
• 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	#000000	rgb(0,0,0)	Page background
surface-raised	#131313	rgb(19,19,19)	Cards, modals, raised surfaces
text-primary	#DFDFDF	rgb(223,223,223)	Headings, body text
text-secondary	#3D69B0	rgb(61,105,176)	Secondary, muted text
text-tertiary	#C1C1CD	rgb(193,193,205)	Additional text
accent	#AAB7F5	rgb(170,183,245)	Primary actions, links, focus

Typography

• MUST use Inter as primary font family
• SHOULD use single font family for consistency
• MUST use 138px / 700 for primary headings
• MUST use 32px / 700 for body text
• SHOULD reduce font weights (currently 6 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	138px	700	#F7F7F7	1
heading-2	Inter	138px	700	#D5D7F0	1
body	Inter	32px	700	#DFDFDF	1
text-29px	Inter	29px	semi_bold	#E0E0E0	1
text-25px	Inter	25px	700	#DFDFDF	1
text-23px	Inter	23px	semi_bold	#D1D1D1	1
text-21px	Inter	21px	500	#C2C2C2	1
text-21px	Inter	21px	400	#5557A0	1
text-20px	Inter	20px	400	#3D69B0	1
text-20px	Inter	20px	400	#C1C1CD	1

Typography Reference

Font Families:

• Inter (used 31x)

Font Sizes: 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 18px, 19px, 20px, 21px, 23px, 25px, 29px, 32px, 138px

Spacing

• MUST use 4px grid for spacing
• SHOULD use spacing from scale: 4px, 5px, 7px, 9px, 12px, 21px, 28px, 69px
• SHOULD use 4px as default gap between elements
• NEVER use arbitrary spacing values (use design scale)
• SHOULD maintain consistent padding within containers

Borders

• NEVER use arbitrary border-radius values (use design scale)
• SHOULD use subtle borders (1px) for element separation

Layout

• MUST design for 1920px base viewport width
• SHOULD use consistent element widths: 10px, 14px, 25px, 29px
• 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: 949px
• Main Content: width: 1920px, height: 1031px
• Header: height: 47px
• Header: height: 48px

Components

Buttons

Variant	Background	Text	Border	Height	Radius
Ghost	transparent	#3D69B0	none	-	-

Interactive States

Focus

• MUST use 2px outline with accent color (#AAB7F5)
• MUST use 2px outline-offset
• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%
• Buttons (secondary): use #131313 background
• List items: use #131313 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