:root{
  --brand:#e8590c;--brand-dark:#d9480f;--brand-soft:#fff4e6;
  --ink:#26221e;--muted:#8a8178;--line:#f3e6d8;--bg:#fffdfb;
  --radius:14px;--shadow:0 2px 10px rgba(120,72,20,.08);--shadow-hover:0 10px 30px rgba(120,72,20,.16);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--ink);background:var(--bg);line-height:1.85;font-size:16px}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}

.nav{position:sticky;top:0;z-index:100;background:rgba(255,253,251,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 20px;height:60px;display:flex;align-items:center;justify-content:space-between}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink)}
.nav-logo img{height:34px;width:auto}
.nav-logo .dot{color:var(--brand)}
.nav-links{display:flex;gap:6px;list-style:none;align-items:center}
.nav-links a{display:block;padding:8px 16px;border-radius:8px;color:var(--ink);font-size:15px;font-weight:500}
.nav-links a:hover{background:var(--brand-soft);color:var(--brand)}
.nav-links a.hl{background:var(--brand);color:#fff}
.nav-links a.hl:hover{background:var(--brand-dark)}
.nav-toggle{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--ink)}

.article{max-width:760px;margin:0 auto;padding:48px 20px 70px}
.crumb{font-size:13.5px;color:var(--muted);margin-bottom:22px}
.article h1{font-size:30px;font-weight:900;line-height:1.4;margin-bottom:12px}
.article .meta{color:var(--muted);font-size:13.5px;padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:28px}
.article h2{font-size:21px;font-weight:800;margin:34px 0 14px;padding-left:14px;border-left:4px solid var(--brand)}
.article h3{font-size:17px;font-weight:700;margin:24px 0 10px}
.article p{margin-bottom:14px;color:#3d3831}
.article ul,.article ol{margin:0 0 14px 24px;color:#3d3831}
.article li{margin-bottom:6px}
.article img{border-radius:12px;max-width:100%;margin:16px 0;border:1px solid var(--line)}
.article blockquote{background:var(--brand-soft);border-left:4px solid var(--brand);border-radius:0 10px 10px 0;padding:14px 18px;margin:18px 0;color:#6b4f2e;font-size:15px}
.article code{background:#f6f1ea;border-radius:5px;padding:2px 7px;font-size:14px;font-family:Consolas,monospace}
.tip{background:#e7f5ff;border:1px solid #a5d8ff;border-radius:10px;padding:14px 18px;margin:18px 0;font-size:14.5px;color:#1864ab}

footer{background:#241f1a;color:#b9aea1;padding:26px 0;font-size:13.5px;text-align:center}
footer a{color:#e8a87c}
.to-top{position:fixed;right:26px;bottom:26px;width:46px;height:46px;border-radius:50%;background:var(--brand);color:#fff;border:0;font-size:20px;cursor:pointer;box-shadow:0 6px 18px rgba(232,89,12,.4);opacity:0;pointer-events:none;transition:opacity .3s;z-index:99}
.to-top.show{opacity:1;pointer-events:auto}
@media (max-width:900px){
  .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;flex-direction:column;padding:12px;border-bottom:1px solid var(--line);box-shadow:var(--shadow-hover)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
}