Planetscale UI Skills

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

When to Apply

Reference these guidelines when:

• Building dark-mode interfaces

• Creating Planetscale-inspired design systems

• Implementing UIs with Inter font and 4px grid

Colors

• MUST use dark backgrounds (lightness < 20) for primary surfaces - detected lightness: 0

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

• MUST use #7967D3 for primary actions and focus states (accent )

• SHOULD reduce color palette (currently 23 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

#F8F8F9 rgb(248,248,249) Cards, modals, raised surfaces

surface-overlay

#EC4011 rgb(236,64,17) Overlays, tooltips, dropdowns

text-primary

#202020 rgb(32,32,32) Headings, body text

text-secondary

#787878 rgb(120,120,120) Secondary, muted text

text-tertiary

#54565C rgb(84,86,92) Additional text

border-default

#D44927 rgb(212,73,39) Subtle borders, dividers

destructive

#EC4011 rgb(236,64,17) Error states, delete actions

success

#41D731 rgb(65,215,49) Success states, confirmations

accent

#7967D3 rgb(121,103,211) Primary actions, links, focus

Typography

• MUST use Inter as primary font family

• SHOULD use single font family for consistency

• MUST use 51px / 700 for primary headings

• MUST use 17px / 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 51px 700 #DF5C2E 1

text-44px

Inter 44px 700 #36F91F 1

text-40px

Inter 40px extra_bold #202020 1

text-39px

Inter 39px extra_bold #1A1A1A 1

text-38px

Inter 38px 700 #1E1E1E 1

text-35px

Inter 35px extra_bold #1D1D1D 1

text-34px

Inter 34px 700 #1A1A1A 1

text-31px

Inter 31px 700 #141414 1

text-30px

Inter 30px 700 #1A1A1A 1

text-30px

Inter 30px 400 #D76B60 1

Typography Reference

Font Families:

• Inter (used 55x)

Font Sizes: 11px, 12px, 13px, 14px, 15px, 16px, 17px, 18px, 21px, 22px, 23px, 24px, 25px, 26px, 29px, 30px, 31px, 34px, 35px, 38px, 39px, 40px, 44px, 51px

Spacing

• MUST use 4px grid for spacing

• SHOULD use spacing from scale: 3px, 4px, 5px, 6px, 7px, 25px, 28px, 32px

• SHOULD use 38px as default gap between elements

• NEVER use arbitrary spacing values (use design scale)

• SHOULD maintain consistent padding within containers

Borders

• MUST use 1px border width consistently

• NEVER use arbitrary border-radius values (use design scale)

• SHOULD use subtle borders (1px) for element separation

Layout

• MUST design for 1920px base viewport width

• SHOULD use consistent element widths: 220px, 221px, 2px, 30px, 1px

• 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: 1041px

• Main Content: width: 1114px, height: 664px

• Main Content: width: 1104px, height: 667px

• Header: height: 39px

Components

Buttons

Variant Background Text Border Height Radius

Ghost transparent #F0B095 none

Interactive States

Focus

• MUST use 2px outline with accent color (#7967D3 )

• MUST use 2px outline-offset

• NEVER remove focus indicators

Hover

• Buttons (primary): lighten background by 10%

• Buttons (secondary): use #F8F8F9 background

• List items: use #F8F8F9 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