Mailchimp UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces

• Creating Mailchimp-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• SHOULD use light backgrounds for primary surfaces

• MUST use #000000 as page background (surface-base )

• MUST use #2E114B for primary actions and focus states (accent )

• SHOULD reduce color palette (currently 35 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

#191610 rgb(25,22,16) Cards, modals, raised surfaces

surface-overlay

#F2F2F2 rgb(242,242,242) Overlays, tooltips, dropdowns

text-primary

#1A1A1A rgb(26,26,26) Headings, body text

text-2

#4D4D4D rgb(77,77,77) Additional text

text-secondary

#A7A7A7 rgb(167,167,167) Secondary, muted text

border-default

#F7F7F7 rgb(247,247,247) Subtle borders, dividers

warning

#FDDB17 rgb(253,219,23) Warning states, cautions

accent

#2E114B rgb(46,17,75) Primary actions, links, focus

success

#72DF58 rgb(114,223,88) Success states, confirmations

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 53px / extra_bold for primary headings

• MUST use 31px / semi_bold 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 53px extra_bold #34332F 1

text-40px

Inter 40px semi_bold #D9D7D3 1

text-36px

Inter 36px extra_bold #1A1A1A 1

body

Inter 31px semi_bold #3E3E3E 1

text-24px

Inter 24px 500 #898989 1

text-22px

Inter 22px 400 #42423F 1

text-20px

Inter 20px 500 #3F3F3F 1

text-18px

Inter 18px 500 #252525 1

text-18px

Inter 18px 700 #E4DCE8 1

text-18px

Inter 18px 500 #BFBFBF 1

Typography Reference

Font Families:

• Inter (used 55x)

Font Sizes: 5px, 6px, 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 17px, 18px, 20px, 22px, 24px, 31px, 36px, 40px, 53px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 11px, 13px

• SHOULD use 2px 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, 5px, 6px, 7px, 9px, 22px, 25px

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

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

• 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, 5px, 6px, 7px, 9px, 22px, 25px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 10px, 12px, 16px, 11px, 27px

• 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: 607px

• Header: height: 30px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #A7A7A7 none

Interactive States

Focus

• MUST use 2px outline with accent color (#2E114B )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #191610 background

• List items: use #191610 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