:root{--color-page-bg: #f9fafb;--color-surface: #ffffff;--color-text: #1F2937;--color-text-muted: #6B7280;--color-border: #E5E7EB}[data-theme=dark]{--color-page-bg: #0f172a;--color-surface: #1e293b;--color-text: #e2e8f0;--color-text-muted: #94a3b8;--color-border: #334155}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;background-color:var(--color-page-bg);color:var(--color-text);transition:background-color .2s,color .2s}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}