:root{--bg:#ffffff;--text:#0f172a;--muted:#475569;--accent:#0ea5a4}.dark{--bg:#071025;--text:#e6eef8;--muted:#94a3b8;--accent:#7dd3fc}body{background:var(--bg);color:var(--text)}.container{max-width:1100px;margin:0 auto;padding:2rem}