:root{font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:#172238;background:#f5f7fc;line-height:1.85}*{box-sizing:border-box}body{margin:0}main{max-width:900px;margin:48px auto;padding:38px 44px;background:white;border:1px solid #e1e7f0;border-radius:20px}a{color:#235bec;text-underline-offset:3px}nav{display:flex;gap:20px;flex-wrap:wrap;border-bottom:1px solid #e5eaf2;padding-bottom:18px;margin-bottom:30px}h1{font-size:30px;line-height:1.4;margin:12px 0}h2{font-size:21px;margin-top:34px}h3{font-size:17px}.muted{color:#667085}.note{padding:16px 20px;border-left:4px solid #235bec;background:#f1f6ff;border-radius:6px}li{margin:7px 0}footer{margin-top:36px;border-top:1px solid #e5eaf2;padding-top:20px;color:#667085;font-size:14px}table{border-collapse:collapse;width:100%;font-size:14px}td,th{border:1px solid #dce3ed;padding:10px;text-align:left;vertical-align:top}code{font-size:.9em;background:#f0f3f9;padding:2px 5px;border-radius:4px}@media(max-width:640px){main{margin:14px;padding:24px 20px}h1{font-size:25px}}