:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#1c2430;background:#f7f8fb}
*{box-sizing:border-box}
body{margin:0;line-height:1.8;background:#f7f8fb}
header,main,footer{width:min(960px,calc(100% - 32px));margin:auto}
header{padding:20px 0;border-bottom:1px solid #e1e6ef;display:flex;justify-content:space-between;gap:20px;align-items:center}
.brand{color:#172033;text-decoration:none;font-weight:800;display:flex;align-items:center;gap:10px}.brand img{width:40px;height:40px}
nav{display:flex;gap:16px;flex-wrap:wrap}nav a{color:#4c5a73;text-decoration:none;font-size:14px}
main{padding:42px 0 54px;max-width:800px}h1{font-size:clamp(30px,5vw,46px);line-height:1.25;margin:0 0 20px;color:#111827}h2{font-size:25px;line-height:1.35;margin:38px 0 10px;color:#172033}h3{margin:0 0 5px;color:#172033}
p,li{font-size:17px;color:#4a5568}a{color:#3154ba}.item{padding:17px 20px;background:#fff;border:1px solid #e1e6ef;border-radius:6px;margin:12px 0}.item p{font-size:15px;margin:0}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.links{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}.button{padding:10px 16px;background:#4169e1;color:#fff;border-radius:6px;text-decoration:none;font-weight:700}.button.secondary{background:#e8edf9;color:#3154ba}.note{padding:16px 20px;border-left:4px solid #4169e1;background:#fff;border-radius:6px;margin:24px 0}footer{border-top:1px solid #e1e6ef;padding:20px 0 30px;color:#718096;font-size:13px}@media(max-width:700px){header{align-items:flex-start;flex-direction:column}.grid{grid-template-columns:1fr}}