:root{--brand:#0d0d0d;--ink:#1c1b26;--muted:#6b6880;--line:#e8e6f0}
*{box-sizing:border-box}
body{margin:0;background:#fbfaff;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.9}
a{color:var(--brand);text-decoration:none}
.nav{position:sticky;top:0;background:rgba(251,250,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);z-index:5}
.nav-inner{max-width:900px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:14px}
.mark{width:34px;height:34px;border-radius:10px;background:#0d0d0d;color:#fff;display:grid;place-items:center;font-weight:700}
.brand b{font-size:15px}.brand small{display:block;font-size:11px;color:var(--muted);letter-spacing:1px}
.nav-links{margin-left:auto;display:flex;gap:20px;font-size:13px}
.nav-links a.active{color:var(--ink);font-weight:600}
.wrap{max-width:900px;margin:0 auto;padding:42px 24px 70px}
.doc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:44px 48px;box-shadow:0 18px 50px rgba(40,30,80,.06)}
h1{font-size:30px;margin:0 0 8px}
.meta{font-size:12.5px;color:var(--muted);margin-bottom:26px}
h2{font-size:17px;margin:30px 0 10px}
p,li{font-size:14px;color:#33313f}
p{margin:0 0 12px}
ul{padding-left:22px;margin:0 0 14px}
li{margin:4px 0}
.note{background:#fff8ef;border:1px solid #f0e2c8;border-radius:10px;padding:12px 16px;font-size:13px;color:#7a5a2a;margin:18px 0}
.foot{border-top:1px solid var(--line);margin-top:34px;padding-top:18px;font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
@media(max-width:640px){.doc{padding:28px 22px}h1{font-size:24px}}

@media (max-width: 640px) {
  .nav-inner { padding: 12px 14px; gap: 10px; }
  .brand small { display: none; }
  .nav-links { gap: 12px; font-size: 12px; }
  .wrap { padding: 22px 12px 50px; }
  .doc { padding: 24px 18px; border-radius: 14px; }
  h1 { font-size: 22px; }
  h2 { font-size: 16px; margin-top: 24px; }
  p, li { font-size: 13.5px; }
  .foot { flex-direction: column; gap: 8px; }
}