beehiiv-ui-skills
Beehiiv's UI design system. Use when building interfaces inspired by Beehiiv's aesthetic - light mode, Inter font, 4px grid.
What this skill does
# Beehiiv UI Skills Opinionated constraints for building Beehiiv-style interfaces with AI agents. ## When to Apply Reference these guidelines when: - Building light-mode interfaces - Creating Beehiiv-inspired design systems - Implementing UIs with Inter font and 4px grid ## Colors - SHOULD use light backgrounds for primary surfaces - MUST use `#221FAB` as page background (`surface-base`) - MUST use `#221FAB` for primary actions and focus states (`accent`) - SHOULD reduce color palette (currently 19 colors detected) - MUST maintain text contrast ratio of at least 4.5:1 for accessibility ### Semantic Tokens | Token | HEX | RGB | Usage | |-------|-----|-----|-------| | `surface-base` | #221FAB | rgb(34,31,171) | Page background | | `surface-raised` | #070512 | rgb(7,5,18) | Cards, modals, raised surfaces | | `text-primary` | #B6B8E7 | rgb(182,184,231) | Headings, body text | | `text-secondary` | #B9B7BF | rgb(185,183,191) | Secondary, muted text | | `text-tertiary` | #626076 | rgb(98,96,118) | Additional text | | `border-default` | #252494 | rgb(37,36,148) | Subtle borders, dividers | | `accent` | #221FAB | rgb(34,31,171) | 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 `12px` / `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 | #EF40B0 | 1 | | `heading-2` | Inter | 51px | 700 | #F7F7F8 | 1 | | `heading-3` | Inter | 51px | 700 | #F5F5F6 | 1 | | `text-41px` | Inter | 41px | 400 | #B8B7BE | 1 | | `text-34px` | Inter | 34px | 700 | #F4F4F5 | 1 | | `text-26px` | Inter | 26px | semi_bold | #CDCCD1 | 1 | | `text-23px` | Inter | 23px | semi_bold | #9B99A5 | 1 | | `text-23px` | Inter | 23px | 500 | #CAC9D0 | 1 | | `text-23px` | Inter | 23px | 700 | #D8D7DB | 1 | | `text-23px` | Inter | 23px | semi_bold | #D1D0D5 | 1 | ### Typography Reference **Font Families:** - `Inter` (used 61x) **Font Sizes:** 5px, 8px, 9px, 10px, 11px, 12px, 13px, 14px, 15px, 16px, 17px, 18px, 19px, 20px, 21px, 22px, 23px, 26px, 34px, 41px, 51px ## Spacing - MUST use 4px grid for spacing - SHOULD use spacing from scale: 4px, 5px, 15px, 21px, 23px, 53px, 56px, 79px - SHOULD use 4px 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 - SHOULD limit border widths to: 1px, 2px - 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:** 3px ## Layout - MUST design for 1920px base viewport width - SHOULD use consistent element widths: 13px, 14px, 26px, 31px, 65px - 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: 999px - **Header**: height: 78px ## Components ### Buttons | Variant | Background | Text | Border | Height | Radius | |---------|------------|------|--------|--------|--------| | Ghost | transparent | #B6B8E7 | none | - | - | ## Interactive States ### Focus - MUST use `2px` outline with accent color (`#221FAB`) - MUST use `2px` outline-offset - NEVER remove focus indicators ### Hover - Buttons (primary): lighten background by 10% - Buttons (secondary): use `#070512` background - List items: use `#070512` 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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