clerk-ui-skills
Clerk's UI design system. Use when building interfaces inspired by Clerk's aesthetic - light mode, Inter font, 4px grid.
What this skill does
# Clerk UI Skills Opinionated constraints for building Clerk-style interfaces with AI agents. ## When to Apply Reference these guidelines when: - Building light-mode interfaces - Creating Clerk-inspired design systems - Implementing UIs with Inter font and 4px grid ## Colors - SHOULD use light backgrounds for primary surfaces - MUST use `#FEFEFE` as page background (`surface-base`) - MUST use `#C4A9F3` for primary actions and focus states (`accent`) - SHOULD reduce color palette (currently 12 colors detected) - MUST maintain text contrast ratio of at least 4.5:1 for accessibility ### Semantic Tokens | Token | HEX | RGB | Usage | |-------|-----|-----|-------| | `surface-base` | #FEFEFE | rgb(254,254,254) | Page background | | `surface-raised` | #090909 | rgb(9,9,9) | Cards, modals, raised surfaces | | `text-primary` | #5C5C5C | rgb(92,92,92) | Headings, body text | | `text-secondary` | #98979D | rgb(152,151,157) | Secondary, muted text | | `text-tertiary` | #2F2F2F | rgb(47,47,47) | Additional text | | `border-default` | #E4E4E1 | rgb(228,228,225) | Subtle borders, dividers | | `accent` | #C4A9F3 | rgb(196,169,243) | Primary actions, links, focus | ## Typography - MUST use `Inter` as primary font family - SHOULD use single font family for consistency - MUST use `66px` / `700` for primary headings - MUST use `26px` / `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 | 66px | 700 | #262628 | 1 | | `body` | Inter | 26px | 700 | #292929 | 1 | | `text-19px` | Inter | 19px | 500 | #4D4D4D | 1 | | `text-18px` | Inter | 18px | 500 | #303030 | 1 | | `text-18px` | Inter | 18px | 400 | #525252 | 1 | | `text-17px` | Inter | 17px | 500 | #E9E9E9 | 1 | | `text-17px` | Inter | 17px | 400 | #838285 | 1 | | `text-16px` | Inter | 16px | 500 | #2F2F2F | 1 | | `text-16px` | Inter | 16px | 300 | #F5F5F5 | 1 | | `text-15px` | Inter | 15px | 400 | #BDBDBD | 1 | ### Typography Reference **Font Families:** - `Inter` (used 28x) **Font Sizes:** 9px, 11px, 12px, 14px, 15px, 16px, 17px, 18px, 19px, 26px, 66px ## Spacing - MUST use 4px grid for spacing - SHOULD use spacing from scale: 1px, 2px, 4px, 5px, 16px, 37px, 49px, 51px - 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: 4px, 6px, 7px - MUST use 1px border width consistently - SHOULD use 6px 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:** 4px, 6px, 7px ## Layout - MUST design for 1920px base viewport width - SHOULD use consistent element widths: 8px, 52px, 44px, 363px, 71px - 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: 584px ## Components - MUST use `0px` height for input fields ### Buttons | Variant | Background | Text | Border | Height | Radius | |---------|------------|------|--------|--------|--------| | Ghost | transparent | #BDBDBD | none | - | - | ### Inputs - Height: `0px` ## Interactive States ### Focus - MUST use `2px` outline with accent color (`#C4A9F3`) - MUST use `2px` outline-offset - NEVER remove focus indicators ### Hover - Buttons (primary): lighten background by 10% - Buttons (secondary): use `#090909` background - List items: use `#090909` 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
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