openai-ui-skills
OpenAI's UI design system. Use when building interfaces inspired by OpenAI's aesthetic - light mode, Inter font, 4px grid.
What this skill does
# OpenAI UI Skills Opinionated constraints for building OpenAI-style interfaces with AI agents. ## When to Apply Reference these guidelines when: - Building light-mode interfaces - Creating OpenAI-inspired design systems - Implementing UIs with Inter font and 4px grid ## Colors - SHOULD use light backgrounds for primary surfaces - MUST use `#FFFFFF` as page background (`surface-base`) - SHOULD limit color palette to 8 distinct colors - MUST maintain text contrast ratio of at least 4.5:1 for accessibility ### Semantic Tokens | Token | HEX | RGB | Usage | |-------|-----|-----|-------| | `surface-base` | #FFFFFF | rgb(255,255,255) | Page background | | `text-primary` | #525252 | rgb(82,82,82) | Headings, body text | | `text-secondary` | #747474 | rgb(116,116,116) | Secondary, muted text | | `text-tertiary` | #8A8A8A | rgb(138,138,138) | Additional text | | `border-default` | #C9C0BB | rgb(201,192,187) | Subtle borders, dividers | ## Typography - MUST use `Inter` as primary font family - SHOULD use single font family for consistency - MUST use `24px` / `semi_bold` for primary headings - MUST use `14px` / `400` for body text - MUST limit font weights to: regular, semi_bold, light - 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 | 24px | semi_bold | #212121 | 1 | | `heading-2` | Inter | 24px | semi_bold | #222222 | 1 | | `body` | Inter | 14px | 400 | #8F8F8F | 1 | | `body-secondary` | Inter | 13px | 400 | #525252 | 2 | | `body-secondary` | Inter | 13px | 400 | #5B5B5B | 1 | | `body-secondary` | Inter | 13px | 400 | #565656 | 1 | | `body-secondary` | Inter | 11px | 400 | #8A8A8A | 1 | | `body-secondary` | Inter | 11px | 400 | #8D8D8D | 1 | | `text-10px` | Inter | 10px | 400 | #5C5C5C | 2 | | `text-10px` | Inter | 10px | 400 | #575757 | 2 | ### Typography Reference **Font Families:** - `Inter` (used 19x) **Font Sizes:** 7px, 10px, 11px, 13px, 14px, 24px ## Spacing - MUST use 4px grid for spacing - SHOULD use spacing from scale: 4px, 5px, 6px, 7px, 10px, 11px, 31px, 32px - 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: 16px, 18px, 19px, 22px - SHOULD use 22px+ radius for pill-shaped elements - MUST use 1px border width consistently - SHOULD use 19px 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:** 16px, 18px, 19px, 22px ## Layout - MUST design for 1920px base viewport width - SHOULD use 202px for sidebar width - SHOULD use consistent element widths: 8px, 21px, 14px, 61px, 36px - 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 - **Sidebar**: width: 202px, position: left ## Components - MUST use `0px` height for input fields ### Buttons | Variant | Background | Text | Border | Height | Radius | |---------|------------|------|--------|--------|--------| | Ghost | transparent | #8A8A8A | none | - | - | ### Inputs - Height: `0px` ## 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 `surface-raised` background - List items: use `surface-raised` 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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