:root{color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}body{margin:0;min-height:100vh;display:grid;place-items:center;background:#f5f7fa;color:#1f2329}main{width:min(420px,calc(100% - 32px));padding:24px;border-radius:16px;background:#fff;box-shadow:0 12px 32px #0f172a14}h1{margin:0 0 8px;font-size:22px}p{margin:0 0 20px;color:#646a73;line-height:1.7}nav{display:grid;gap:12px}a{display:block;padding:14px 16px;border:1px solid #e5e6eb;border-radius:12px;color:#1677ff;text-decoration:none}a:hover{background:#f7faff}