:root{--bg: #f8fafc;--surface: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e8f0;--accent: #2563eb;color-scheme:light dark}@media(prefers-color-scheme:dark){:root{--bg: #0f172a;--surface: #1e293b;--text: #e2e8f0;--muted: #94a3b8;--border: #334155;--accent: #3b82f6}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}