Mixpanel UI Skills

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

When to Apply

Reference these guidelines when:

• Building light-mode interfaces

• Creating Mixpanel-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• SHOULD use light backgrounds for primary surfaces

• MUST use #F4F3F4 as page background (surface-base )

• MUST use #201757 for primary actions and focus states (accent )

• SHOULD reduce color palette (currently 32 colors detected)

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

Semantic Tokens

Token HEX RGB Usage

surface-base

#F4F3F4 rgb(244,243,244) Page background

surface-raised

#85292D rgb(133,41,45) Cards, modals, raised surfaces

surface-overlay

#BF4038 rgb(191,64,56) Overlays, tooltips, dropdowns

text-primary

#CFCFCF rgb(207,207,207) Headings, body text

text-secondary

#868686 rgb(134,134,134) Secondary, muted text

text-tertiary

#737373 rgb(115,115,115) Additional text

border-default

#D9D5F2 rgb(217,213,242) Subtle borders, dividers

accent

#201757 rgb(32,23,87) Primary actions, links, focus

destructive

#FAAEA0 rgb(250,174,160) Error states, delete actions

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 62px / 700 for primary headings

• MUST use 15px / 400 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 62px 700 #2C2B2D 1

text-28px

Inter 28px semi_bold #423C50 1

text-22px

Inter 22px semi_bold #505050 1

text-22px

Inter 22px semi_bold #4F4F4F 1

text-19px

Inter 19px 500 #4A4A4C 1

text-16px

Inter 16px 400 #CFCFCF 1

text-16px

Inter 16px 400 #717171 1

body

Inter 15px 400 #808080 1

body-secondary

Inter 15px semi_bold #313131 1

body-secondary

Inter 15px 500 #3E3E3E 1

Typography Reference

Font Families:

• Inter (used 129x)

Font Sizes: 5px, 6px, 7px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 19px, 22px, 28px, 62px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 7px, 8px

• SHOULD use 3px 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: 1px, 2px, 3px, 4px, 6px, 7px, 9px, 10px, 13px, 15px, 18px, 19px, 21px, 28px

• SHOULD use 21px+ radius for pill-shaped elements

• SHOULD limit border widths to: 1px, 2px, 3px, 4px

• SHOULD use 3px 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: 1px, 2px, 3px, 4px, 6px, 7px, 9px, 10px, 13px, 15px, 18px, 19px, 21px, 28px

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 15px, 10px, 16px, 18px, 214px

• 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

• Main Content: width: 1150px, height: 562px

• Header: height: 56px

Components

• MUST use 0px height for input fields

Buttons

Variant Background Text Border Height Radius

Ghost transparent #C0C0C0 none

Inputs

• Height: 0px

Interactive States

Focus

• MUST use 2px outline with accent color (#201757 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #85292D background

• List items: use #85292D 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