:root{color-scheme:dark}body,html{margin:0;padding:0;font-family:Arial,Helvetica,sans-serif;background:#0b1020;color:#f4f7fb}a{color:inherit}*{box-sizing:border-box}main{max-width:960px;margin:0 auto;padding:48px 20px}.card{background:#121a31;border:1px solid #24304f;border-radius:16px;padding:20px}.grid{display:grid;gap:16px}