{
  "schemaVersion": "0.1.0",
  "title": "Add dark mode support",
  "description": "Implement theme switcher with light/dark modes",
  "acceptanceCriteria": [
    "User can toggle between light and dark themes via UI control",
    "Theme preference persists across browser sessions",
    "All UI components render correctly in both themes",
    "Theme respects system preference on first visit",
    "Theme transition is smooth without flashing"
  ],
  "technicalContext": "Use CSS variables for theming. Store preference in localStorage. Detect system preference via prefers-color-scheme media query. Existing components: Button, Card, Nav, Footer.",
  "constraints": "Must support IE11+ (no CSS Grid). Theme switcher must be accessible (ARIA labels, keyboard navigation).",
  "repo": "owner/repo",
  "createdAt": "2025-11-09T14:30:00.000Z"
}