body{background:#f5f7fa;color:#283a51;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;margin:0;line-height:1.8}main{max-width:760px;margin:64px auto;padding:0 28px 64px}header{display:flex;justify-content:space-between;align-items:center;padding:24px 28px;border-bottom:1px solid #dce4ef;background:#fff}header img{width:128px}a{color:#3c639e}h1{font-size:clamp(28px,6vw,44px);line-height:1.25;letter-spacing:-.03em}h2{font-size:22px;margin-top:36px}small,.muted{color:#6a7b90}.card{background:#fff;border:1px solid #dce4ef;border-radius:16px;padding:24px;margin-top:28px}.button{display:inline-block;background:#334866;color:#fff;padding:10px 20px;border-radius:8px;text-decoration:none}code{overflow-wrap:anywhere}li{margin-bottom:8px}@media(max-width:480px){main{margin-top:40px}header{padding:18px 20px}.card{padding:18px}}