feat: Design and implement CSS design token system#1
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Define semantic CSS custom properties (--color-bg, --color-surface, --color-text-primary, etc.) for both light and dark palettes. Apply via :root and [data-theme='dark'] selectors.
Generated by OpenDev AI
Three-layer design token system for OpenDev:
tokens.css — Single CSS file with all custom properties. Primitive palette (~80 raw values) is theme-invariant; semantic tokens (bg, surface, text, border, accent, status) are declared on :root (light) and overridden on [data-theme='dark']. Shadows increase opacity in dark mode. Reduced-motion @media sets all durations to 0ms. Eight categories: colors, typography, spacing (4px grid), radius, shadow, motion, and z-index.
tokens.ts — Exhaustive TypeScript union types for every token name so typos are caught at compile time.
token()returns the CSS var() string for inline styles.cssVar()reads live computed values from the DOM.applyTheme()/loadTheme()handle localStorage persistence.buildAntiFlashScript()emits an inline script for the HTML to prevent FOUC on hard reload.useTheme.ts — React hook that hydrates from localStorage after mount (SSR-safe), applies the theme as a side-effect, and listens for OS-level prefers-color-scheme changes when preference is 'system'. Exposes
theme,resolvedTheme,setTheme,toggleTheme, andisMounted.