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