Rules

Each file is a self-contained rule an agent can apply without reading a full codebase.

• Book-Cover NavFull-viewport mobile nav, no hamburger, #stage scroll
• CSS Token ThemingCSS custom property tokens, data-* cascade, dark/high-contrast
• Focus RingsLayered box-shadow rings, forced-colors safe
• Responsive Image <picture><picture> with monochrome + WebP + JPEG, CLS prevention
• Service Worker StrategiesPer-request caching strategies, response.ok guard, timestamp cleanup
• Canvas + <a download> Export<canvas> to data URI to <a download> — no server needed
• ARIA Patternsaria-current, aria-pressed, aria-describedby, live regions
• Focus ManagementautoFocus, scroll-mt, #stage as skip-link replacement
• Trusted Network AccessOwner vs guest on self-hosted apps, Tailscale + LAN ranges
• Offline Mutation QueuelocalStorage queue, ordered flush, startup replay
• System Font StacksZero-download typography, no Google Fonts
• Print StylesPrintable documents — hide chrome, show URLs, collapse heroes