*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#0f1117;--color-surface:#1a1d27;--color-border:#2a2d3a;--color-text:#e2e4e9;--color-text-muted:#8b8fa3;--color-success:#22c55e;--color-error:#ef4444;--radius:8px}body{background:var(--color-bg);color:var(--color-text);min-height:100vh;font-family:system-ui,-apple-system,sans-serif;line-height:1.6}main{max-width:720px;margin:0 auto;padding:2rem}