:root{color-scheme:light;font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:#203047;background:#f5f7fa}*{box-sizing:border-box}body{margin:0}header,main,footer{max-width:850px;margin:auto;padding:28px 24px}header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #dce3ec}a{color:#165ba8;text-underline-offset:4px}nav{display:flex;gap:20px;flex-wrap:wrap}.brand{font-size:24px;font-weight:750;color:#203047;text-decoration:none}main{padding-top:52px;padding-bottom:52px;min-height:65vh}h1{font-size:38px;line-height:1.2;margin:12px 0 24px}h2{font-size:21px;margin-top:32px}p,li{font-size:16px;line-height:1.85}li{margin:8px 0}.eyebrow{color:#52647a;font-size:13px;letter-spacing:1px}.lead{font-size:19px}.card{padding:22px 26px;border:1px solid #dce3ec;border-radius:14px;background:white;margin:28px 0}.muted,footer{color:#52647a;font-size:14px}footer{border-top:1px solid #dce3ec} @media(max-width:600px){header{align-items:flex-start;gap:20px;flex-direction:column}h1{font-size:30px}main{padding-top:32px}nav{gap:15px}}