:root{--blue:#2563eb;--blue-d:#1d4ed8;--ink:#0a0a0a;--ink-2:#334155;--ink-3:#64748b;--line:#e2e8f0;--bg:#f8f9fc;--max:820px}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.85;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--blue-d);text-decoration:none}
a:hover{text-decoration:underline}
.top{position:sticky;top:0;z-index:9;display:flex;align-items:center;justify-content:space-between;padding:14px 24px;background:rgba(255,255,255,.93);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{font-weight:800;font-size:17px;letter-spacing:-.01em;color:var(--ink)}
.brand i{font-style:normal;color:var(--blue)}
.top nav a{margin-left:18px;font-size:14px;color:var(--ink-3);text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:36px 24px 72px}
h1{font-size:30px;line-height:1.32;font-weight:800;letter-spacing:-.02em;margin-bottom:10px}
.meta{color:#94a3b8;font-size:13px;margin-bottom:26px}
.lead{font-size:17px;color:var(--ink-2);margin-bottom:22px}
h2{font-size:21px;font-weight:700;margin:34px 0 10px;letter-spacing:-.01em}
h3{font-size:16.5px;font-weight:700;margin:24px 0 4px}
p,li{color:var(--ink-2);margin:8px 0}
ul,ol{padding-left:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 24px;margin:16px 0}
table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14.5px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--ink-3);font-weight:600;background:#fbfcfe}
.q{border-top:1px solid var(--line);padding-top:18px;margin-top:18px}
.q:first-of-type{border-top:none;padding-top:0;margin-top:0}
footer{border-top:1px solid var(--line);padding:26px 24px;text-align:center;color:#94a3b8;font-size:13px}
footer a{color:#64748b;margin:0 8px;text-decoration:none}
@media(max-width:640px){h1{font-size:24px}.wrap{padding:24px 18px 56px}}