Convertkit UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces

• Creating Convertkit-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 #194775 for primary actions and focus states (accent )

• SHOULD reduce color palette (currently 18 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

#EEE9E4 rgb(238,233,228) Cards, modals, raised surfaces

surface-overlay

#379EFD rgb(55,158,253) Overlays, tooltips, dropdowns

text-primary

#6C6C6C rgb(108,108,108) Headings, body text

text-secondary

#8C8B91 rgb(140,139,145) Secondary, muted text

text-tertiary

#4B4855 rgb(75,72,85) Additional text

border-default

#EFFEFE rgb(239,254,254) Subtle borders, dividers

accent

#194775 rgb(25,71,117) Primary actions, links, focus

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 75px / 700 for primary headings

• MUST use 29px / 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 75px 700 #242221 1

body

Inter 29px semi_bold #4B4855 1

text-24px

Inter 24px 700 #292929 1

text-17px

Inter 17px 400 #6D6864 1

text-16px

Inter 16px 400 #66625E 1

text-15px

Inter 15px 400 #9DA1A5 1

text-15px

Inter 15px 500 #CED2D4 1

text-15px

Inter 15px 500 #4A4744 1

text-15px

Inter 15px 500 #4D4A47 1

text-14px

Inter 14px 400 #8C8B91 1

Typography Reference

Font Families:

• Inter (used 35x)

Font Sizes: 11px, 12px, 13px, 14px, 15px, 16px, 17px, 24px, 29px, 75px

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: 3px, 4px, 6px, 7px, 9px, 10px

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

• SHOULD use 7px 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: 3px, 4px, 6px, 7px, 9px, 10px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 44px, 10px, 335px, 107px, 142px

• 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

• Header: height: 58px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #5B5B5B none

Interactive States

Focus

• MUST use 2px outline with accent color (#194775 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #EEE9E4 background

• List items: use #EEE9E4 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