:root{
  --bg:#f3f0e8;
  --bg-soft:#ebe6da;
  --ink:#1d2432;
  --ink-soft:#4a5160;
  --navy:#16212f;
  --navy-2:#1e2d40;
  --copper:#b7791f;
  --copper-2:#d99a3a;
  --line:#d8d1c2;
  --card:#fffdf7;
  --accent-red:#b5443a;
  --accent-blue:#2f5f8a;
  --radius:6px;
  --shadow:0 1px 3px rgba(22,33,47,.12);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.7;
}
a{color:var(--navy-2);text-decoration:none}
a:hover{color:var(--copper)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}

/* Header shell */
.site-header{
  background:var(--navy);
  color:#f5f1e6;
  position:sticky;top:0;z-index:20;
  box-shadow:0 2px 6px rgba(0,0,0,.2);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 18px;max-width:1180px;margin:0 auto;gap:16px;
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand img{width:44px;height:44px;border-radius:8px;flex-shrink:0}
.brand .brand-name{font-size:19px;font-weight:700;letter-spacing:.5px;color:#f5f1e6;white-space:nowrap}
.brand .brand-sub{font-size:12px;color:#c8bfa8;display:block}
.nav-toggle{display:none;background:none;border:1px solid #6b7484;color:#f5f1e6;border-radius:6px;padding:6px 12px;font-size:15px;cursor:pointer}
.main-nav ul{display:flex;gap:4px;list-style:none;flex-wrap:wrap}
.main-nav a{
  color:#e4ddca;display:block;padding:8px 11px;border-radius:6px;font-size:15px;
}
.main-nav a:hover{background:rgba(255,255,255,.08);color:#fff}
.main-nav a.is-active{background:var(--copper);color:#fff}

/* Layout: left-doc-tree */
.layout{
  display:grid;grid-template-columns:210px 1fr;gap:26px;
  max-width:1180px;margin:28px auto 60px;padding:0 18px;align-items:start;
}
.side-col{
  position:sticky;top:84px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 16px;box-shadow:var(--shadow);
}
.side-col h4{font-size:13px;color:var(--copper);letter-spacing:2px;margin-bottom:10px;text-transform:uppercase}
.side-list{list-style:none}
.side-list a{display:flex;justify-content:space-between;padding:7px 4px;border-radius:4px;font-size:14px;color:var(--ink-soft)}
.side-list a:hover{color:var(--copper);background:var(--bg-soft)}
.side-list a b{color:var(--copper-2);font-weight:600}
.side-list a.is-active{color:var(--copper);font-weight:700}

.content-col{min-width:0}

/* Breadcrumb */
.crumb{font-size:13px;color:var(--ink-soft);margin-bottom:14px}
.crumb a{color:var(--copper)}
.crumb span{color:var(--ink-soft)}

/* Hero (home) */
.hero{
  background:var(--navy);
  color:#f5f1e6;border-radius:var(--radius);
  padding:28px 26px;margin-bottom:22px;
  display:grid;grid-template-columns:1.2fr .9fr;gap:24px;align-items:center;
}
.hero h1{font-size:30px;line-height:1.25;margin-bottom:10px}
.hero p{color:#d9d0ba;max-width:56ch;margin-bottom:16px}
.hero-meta{display:flex;gap:22px;flex-wrap:wrap;font-size:13px;color:#cfc6ad}
.hero-meta b{color:var(--copper-2);font-size:18px;display:block}
.hero img{border-radius:8px}

/* Sections */
section{margin-bottom:26px}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;border-bottom:2px solid var(--navy);padding-bottom:6px;margin-bottom:14px}
.sec-head h2,.sec-head h1{font-size:20px;color:var(--navy)}
.sec-head a{font-size:13px;color:var(--copper)}

/* Number summary strip */
.summary-strip{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.summary-cell{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px;text-align:center;box-shadow:var(--shadow)}
.summary-cell .lbl{font-size:12px;color:var(--ink-soft)}
.summary-cell .val{font-size:22px;font-weight:700;color:var(--navy);margin-top:2px}
.summary-cell .ball{display:inline-block;width:30px;height:30px;line-height:30px;border-radius:50%;font-size:14px;font-weight:700;margin:1px}
.summary-cell .ball.red{background:var(--accent-red);color:#fff}
.summary-cell .ball.blue{background:var(--accent-blue);color:#fff}

/* Cards & grid */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.card img{width:100%;height:150px;object-fit:cover}
.card-body{padding:14px}
.card-body h3{font-size:16px;margin-bottom:6px;color:var(--navy)}
.card-body p{font-size:13px;color:var(--ink-soft)}
.card .tag{display:inline-block;background:var(--bg-soft);color:var(--copper);font-size:12px;padding:1px 8px;border-radius:999px;margin-bottom:8px}

/* Data table */
.data-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);font-size:14px}
.data-table th{background:var(--navy);color:#f5f1e6;padding:9px 10px;text-align:left;font-weight:600}
.data-table td{padding:8px 10px;border-top:1px solid var(--line)}
.data-table tr:nth-child(even) td{background:var(--bg-soft)}
.ball.sm{width:22px;height:22px;line-height:22px;font-size:12px}

/* Omit bars */
.omit-row{display:flex;align-items:center;gap:10px;margin-bottom:8px;font-size:13px}
.omit-row .num{width:30px;text-align:right;font-weight:700;color:var(--navy)}
.omit-track{flex:1;background:var(--bg-soft);border-radius:999px;height:12px;overflow:hidden}
.omit-fill{height:100%;background:var(--copper-2);border-radius:999px}
.omit-val{width:44px;font-weight:700;color:var(--copper)}

/* Article */
.article{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.article h1{font-size:26px;line-height:1.3;margin-bottom:6px}
.article .byline{font-size:13px;color:var(--ink-soft);margin-bottom:18px}
.article img{border-radius:var(--radius);margin:12px 0 20px}
.article h2{font-size:20px;color:var(--navy);margin:24px 0 10px;padding-left:10px;border-left:4px solid var(--copper)}
.article p{margin-bottom:14px;color:var(--ink-soft)}
.article ul,.article ol{margin:0 0 14px 22px;color:var(--ink-soft)}
.article li{margin-bottom:6px}
.article .back-cat{margin-top:22px;display:inline-block;background:var(--navy);color:#fff;padding:8px 16px;border-radius:6px;font-size:14px}
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:26px;align-items:start}
.aside-box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.aside-box h3{font-size:16px;color:var(--navy);margin-bottom:12px;padding-bottom:6px;border-bottom:2px solid var(--copper)}
.aside-box a{display:block;padding:7px 0;font-size:14px;color:var(--ink-soft);border-bottom:1px dashed var(--line)}
.aside-box a:hover{color:var(--copper)}

/* Category list */
.cat-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cat-list li{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.cat-list a{font-size:16px;font-weight:700;color:var(--navy)}
.cat-list p{font-size:13px;color:var(--ink-soft);margin-top:4px}

/* Footer shell */
.site-footer{background:var(--navy);color:#c8bfa8;padding:34px 18px 28px;margin-top:40px}
.foot-grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;font-size:13px}
.foot-grid h4{color:#f5f1e6;font-size:14px;margin-bottom:8px}
.foot-grid p{margin-bottom:4px}
.foot-bottom{max-width:1180px;margin:20px auto 0;padding-top:16px;border-top:1px solid #35404f;font-size:12px;color:#8f96a3;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

@media (max-width:900px){
  .layout{grid-template-columns:1fr}
  .side-col{position:static;order:-1}
  .grid2,.grid3,.summary-strip{grid-template-columns:1fr 1fr}
  .article-layout{grid-template-columns:1fr}
  .hero{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .nav-toggle{display:block}
  .main-nav{display:none;width:100%}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column}
  .grid2,.grid3,.summary-strip,.cat-list,.foot-grid{grid-template-columns:1fr}
  .hero h1{font-size:23px}
  .article{padding:18px}
}