Loops UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces

• Creating Loops-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 )

• SHOULD reduce color palette (currently 17 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

#ECECEC rgb(236,236,236) Cards, modals, raised surfaces

text-primary

#CCCCCE rgb(204,204,206) Headings, body text

text-secondary

#AAAAAE rgb(170,170,174) Secondary, muted text

text-tertiary

#85B1A4 rgb(133,177,164) Additional text

border-default

#F4F5F6 rgb(244,245,246) Subtle borders, dividers

destructive

#D77B5F rgb(215,123,95) Error states, delete actions

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 39px / 700 for primary headings

• MUST use 22px / 700 for body text

• SHOULD reduce font weights (currently 4 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 39px 700 #2B2A29 1

body

Inter 22px 700 #423029 1

text-18px

Inter 18px 400 #626262 1

text-17px

Inter 17px 400 #93908E 1

text-17px

Inter 17px 500 #525252 1

text-16px

Inter 16px 500 #525252 1

text-15px

Inter 15px 500 #544542 1

text-15px

Inter 15px 400 #6D6D6D 1

text-14px

Inter 14px 400 #CCCCCE 1

text-14px

Inter 14px 300 #CCCCCE 1

Typography Reference

Font Families:

• Inter (used 86x)

Font Sizes: 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 17px, 18px, 22px, 39px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 8px, 9px

• 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: 0px, 1px, 2px, 3px, 4px, 6px, 7px, 9px, 10px, 26px

• SHOULD use 26px+ radius for pill-shaped elements

• MUST use 1px border width consistently

• SHOULD use 1px 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: 0px, 1px, 2px, 3px, 4px, 6px, 7px, 9px, 10px, 26px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 13px, 27px, 50px, 12px, 7px

• 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: 1030px

• Main Content: width: 994px, height: 568px

• Header: height: 52px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #AAAAAE none

Interactive States

Focus

• MUST use 2px outline with accent color (#5E6AD2 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #ECECEC background

• List items: use #ECECEC 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