liveblocks-ui-skills
Liveblocks's UI design system. Use when building interfaces inspired by Liveblocks's aesthetic - dark mode, Inter font, 4px grid.
What this skill does
# Liveblocks UI Skills Opinionated constraints for building Liveblocks-style interfaces with AI agents. ## When to Apply Reference these guidelines when: - Building dark-mode interfaces - Creating Liveblocks-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`) - SHOULD reduce color palette (currently 11 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` | #E5E5E5 | rgb(229,229,229) | Cards, modals, raised surfaces | | `surface-overlay` | #FEFEFE | rgb(254,254,254) | Overlays, tooltips, dropdowns | | `text-primary` | #818181 | rgb(129,129,129) | Headings, body text | | `text-secondary` | #5B595A | rgb(91,89,90) | Secondary, muted text | | `text-tertiary` | #B5B5B5 | rgb(181,181,181) | Additional text | | `border-default` | #EAEAEA | rgb(234,234,234) | Subtle borders, dividers | ## Typography - MUST use `Inter` as primary font family - SHOULD use single font family for consistency - MUST use `54px` / `700` for primary headings - MUST use `19px` / `400` for body text - MUST limit font weights to: medium, regular, bold - 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 | 54px | 700 | #E9E9E9 | 1 | | `body` | Inter | 19px | 400 | #818181 | 1 | | `body-secondary` | Inter | 19px | 400 | #8E8E8E | 1 | | `body-secondary` | Inter | 18px | 400 | #737373 | 1 | | `body-secondary` | Inter | 18px | 500 | #C4C4C4 | 1 | | `body-secondary` | Inter | 17px | 400 | #707070 | 1 | | `text-15px` | Inter | 15px | 400 | #8E8E8E | 1 | | `text-15px` | Inter | 15px | 400 | #747474 | 1 | | `text-15px` | Inter | 15px | 400 | #777777 | 1 | | `text-15px` | Inter | 15px | 400 | #797979 | 1 | ### Typography Reference **Font Families:** - `Inter` (used 30x) **Font Sizes:** 6px, 8px, 11px, 12px, 14px, 15px, 17px, 18px, 19px, 54px ## Spacing - MUST use 4px grid for spacing - SHOULD use spacing from scale: 1px, 2px, 3px, 4px, 5px, 6px, 7px, 8px - 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: 3px, 5px, 19px - MUST use 1px border width consistently - 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, 5px, 19px ## Layout - MUST design for 1920px base viewport width - SHOULD use consistent element widths: 36px, 48px, 1px, 8px, 47px - 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: 1855px, height: 1080px - **Main Content**: width: 1920px, height: 769px - **Main Content**: width: 1920px, height: 559px ## Components ### Buttons | Variant | Background | Text | Border | Height | Radius | |---------|------------|------|--------|--------|--------| | Ghost | transparent | #6B6B6B | none | - | - | ## Interactive States ### Focus - MUST use `2px` outline with accent color (`#5E6AD2`) - MUST use `2px` outline-offset - NEVER remove focus indicators ### Hover - Buttons (primary): lighten background by 10% - Buttons (secondary): use `#E5E5E5` background - List items: use `#E5E5E5` 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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