Loom UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces

• Creating Loom-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• SHOULD use light backgrounds for primary surfaces

• MUST use #E4EDFE as page background (surface-base )

• MUST use #2256C7 for primary actions and focus states (accent )

• SHOULD reduce color palette (currently 14 colors detected)

• MUST maintain text contrast ratio of at least 4.5:1 for accessibility

Semantic Tokens

Token HEX RGB Usage

surface-base

#E4EDFE rgb(228,237,254) Page background

surface-raised

#FFFFFF rgb(255,255,255) Cards, modals, raised surfaces

surface-overlay

#171718 rgb(23,23,24) Overlays, tooltips, dropdowns

text-primary

#B6B6B7 rgb(182,182,183) Headings, body text

text-2

#363B43 rgb(54,59,67) Additional text

text-secondary

#B1CFEF rgb(177,207,239) Secondary, muted text

border-default

#E8EEF8 rgb(232,238,248) Subtle borders, dividers

accent

#2256C7 rgb(34,86,199) Primary actions, links, focus

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 54px / 700 for primary headings

• MUST use 25px / 500 for body text

• MUST limit font weights to: medium, bold, regular

• 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 54px 700 #1D1D1F 1

body

Inter 25px 500 #3C3C3C 1

text-20px

Inter 20px 500 #333433 1

text-16px

Inter 16px 400 #656565 1

text-16px

Inter 16px 400 #626262 1

text-16px

Inter 16px 400 #676767 1

text-15px

Inter 15px 400 #666666 1

caption

Inter 13px 500 #B6B6B7 1

label

Inter 13px 400 #4A505C 1

label

Inter 12px 400 #B1CFEF 1

Typography Reference

Font Families:

• Inter (used 15x)

Font Sizes: 11px, 12px, 13px, 15px, 16px, 20px, 25px, 54px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 4px, 5px, 6px, 7px, 9px, 10px, 13px, 14px

• 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: 4px, 15px, 18px, 22px, 26px, 28px

• SHOULD use 22px+ radius for pill-shaped elements

• SHOULD limit border widths to: 1px, 2px

• SHOULD use 28px 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: 4px, 15px, 18px, 22px, 26px, 28px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 137px, 144px, 6px

• 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

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #B6B6B7 none

Interactive States

Focus

• MUST use 2px outline with accent color (#2256C7 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #FFFFFF background

• List items: use #FFFFFF 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