:root{
  --primary:#2563eb; --primary-2:#4f46e5; --primary-grad:linear-gradient(135deg,#2563eb,#4f46e5);
  --soft:#eff6ff; --soft-2:#f0f9ff; --line-soft:#bfdbfe;
  --bg:#f5f7fa; --surface:#fff; --border:#e6e8ec; --border-2:#eef0f3;
  --text:#1f2733; --text-2:#5b6573; --text-3:#9aa3b2;
  --code-bg:#0f1b2d; --code-text:#d7e2f0; --inline-bg:#eef1f5;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 1px 3px rgba(16,24,40,.06);
  --shadow-lg:0 12px 32px rgba(16,24,40,.16);
  --radius:12px; --header-h:60px; --side-w:268px;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:15px;line-height:1.7;color:var(--text);background:var(--bg);
  display:flex;flex-direction:column;overflow:hidden;
}
a{color:var(--primary);text-decoration:none}
a:hover{color:#1d4ed8}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input{font-family:inherit}
::selection{background:#c7dbff}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:#cbd2dc;border-radius:8px;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:#aeb7c4;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-track{background:transparent}

/* 顶部栏 */
.header{flex:0 0 var(--header-h);background:var(--surface);border-bottom:1px solid var(--border);position:relative;z-index:60}
.header-inner{height:100%;max-width:1680px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.header-left{display:flex;align-items:center;gap:12px;min-width:0}
.brand{display:flex;align-items:center;gap:11px;color:var(--text)}
.brand:hover{color:var(--text)}
.brand-logo{width:38px;height:38px;border-radius:11px;background:var(--primary-grad);display:flex;align-items:center;justify-content:center;box-shadow:0 6px 14px rgba(37,99,235,.32);flex:none}
.brand-title{font-size:18px;font-weight:700;letter-spacing:.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon-btn{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--text-2);transition:.15s}
.icon-btn:hover{background:var(--soft);color:var(--primary)}
#btn-menu{display:none}
.header-right{display:flex;align-items:center;gap:10px;flex:none}
.search-box{position:relative;width:280px;display:block}
.search-input{width:100%;height:40px;padding:0 16px 0 40px;border:1px solid var(--border);border-radius:22px;background:#f3f5f8;font-size:14px;color:var(--text);outline:none;transition:.18s}
.search-input::placeholder{color:var(--text-3)}
.search-input:focus{background:#fff;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.14)}
.search-box .ic-left{position:absolute;left:13px;top:50%;transform:translateY(-50%);color:var(--text-3);pointer-events:none;display:flex}
#btn-search-icon{display:none}

/* 搜索建议 */
.suggest{position:absolute;top:46px;left:0;right:0;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);overflow:hidden;display:none;z-index:80}
.suggest.open{display:block}
.suggest-list{max-height:340px;overflow-y:auto;padding:6px}
.suggest-item{width:100%;display:flex;align-items:center;gap:10px;padding:9px 11px;border-radius:9px;text-align:left;transition:.12s}
.suggest-item:hover,.suggest-item.active{background:var(--soft)}
.suggest-item .s-ic{flex:none;color:var(--primary);display:flex}
.suggest-item .s-main{min-width:0;flex:1}
.suggest-item .s-title{font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.suggest-item .s-path{font-size:12px;color:var(--text-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.suggest-item mark{background:#fde68a;color:#92400e;border-radius:3px;padding:0 2px}
.suggest-empty{padding:22px 14px;text-align:center;color:var(--text-3);font-size:13.5px}

/* 窄屏搜索面板 */
.search-panel{position:fixed;top:var(--header-h);left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);padding:12px 16px;box-shadow:var(--shadow-lg);z-index:70;display:none}
.search-panel.open{display:block}
.search-panel .field{position:relative}

/* 主体 */
.layout{flex:1;display:flex;min-height:0;position:relative;width:100%}
#sidebar{flex:0 0 var(--side-w);background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;overflow-x:hidden;z-index:40}
.side-head{position:sticky;top:0;background:var(--surface);padding:14px 14px 10px;border-bottom:1px solid var(--border-2);z-index:2}
.side-title{display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;color:var(--text)}
.side-title svg{color:var(--primary)}
.side-head-row{display:flex;align-items:center;justify-content:space-between}
#btn-toggle-all{width:28px;height:28px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--text-3);transition:.15s}
#btn-toggle-all:hover{background:var(--soft);color:var(--primary)}

/* 导航树 */
.nav-list{list-style:none;padding:8px 10px 24px}
.nav-node{list-style:none}
.node-row{display:flex;align-items:center;border-radius:9px;transition:.13s}
.node-row:hover{background:#f4f6f9}
.node-toggle{flex:none;width:22px;height:30px;display:flex;align-items:center;justify-content:center;color:var(--text-3);border-radius:6px}
.node-toggle svg{transition:transform .2s}
.nav-node.expanded>.node-row .node-toggle svg{transform:rotate(90deg)}
.node-label{flex:1;min-width:0;display:flex;align-items:center;gap:8px;padding:5px 8px 5px 0;font-size:14px;color:var(--text-2);border-radius:8px;text-align:left;cursor:pointer}
.node-label:hover{color:var(--text)}
.node-ic{flex:none;display:flex;color:var(--text-3)}
.nav-node.is-group>.node-row .node-ic{color:var(--primary)}
.node-text{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav-node .node-dot{width:5px;height:5px;border-radius:50%;background:#cfd6e0;margin:0 0 0 9px;flex:none}
.nav-children{list-style:none}
.nav-children.collapsed{display:none}
.nav-node.current>.node-row{background:var(--soft)}
.nav-node.current>.node-row .node-label{color:var(--primary);font-weight:600}
.nav-node.current>.node-row .node-dot{background:var(--primary)}

/* 内容区 */
#main{flex:1;min-width:0;overflow-y:auto;scroll-behavior:smooth}
#content{max-width:980px;margin:0 auto;padding:30px 34px 60px}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:7px;font-size:13px;color:var(--text-3);margin-bottom:18px}
.breadcrumb a{color:var(--text-2)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:var(--text-3)}
.breadcrumb .cur{color:var(--text);font-weight:600}

/* 首页 */
.home-hero{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:38px 36px;box-shadow:var(--shadow);margin-bottom:26px;position:relative;overflow:hidden}
.home-hero::after{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,.12),transparent 70%)}
.home-hero h1{font-size:28px;font-weight:800;margin-bottom:10px;letter-spacing:.3px}
.home-hero p{color:var(--text-2);max-width:620px}
.hero-stats{display:flex;gap:28px;margin-top:22px;flex-wrap:wrap}
.hero-stat .num{font-size:24px;font-weight:800;color:var(--primary)}
.hero-stat .lbl{font-size:13px;color:var(--text-3)}
.home-section-title{font-size:16px;font-weight:700;margin:26px 0 14px;display:flex;align-items:center;gap:8px}
.home-section-title svg{color:var(--primary)}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.doc-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px;transition:.18s;box-shadow:var(--shadow);color:var(--text);min-width:0}
.doc-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--line-soft);color:var(--text)}
.card-badge{align-self:flex-start;font-size:12px;font-weight:600;color:var(--primary);background:var(--soft);border:1px solid var(--line-soft);padding:2px 9px;border-radius:20px;margin-bottom:11px}
.card-title{font-size:15.5px;font-weight:700;margin-bottom:6px}
.card-desc{font-size:13.5px;color:var(--text-2);flex:1;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{display:flex;align-items:center;gap:6px;margin-top:14px;font-size:12.5px;color:var(--text-3)}
.card-meta svg{display:flex}

/* 搜索结果标题 */
.search-meta{margin-bottom:20px}
.search-h1{font-size:24px;font-weight:800;margin-bottom:4px}
.search-meta p{color:var(--text-3);font-size:14px}

/* 文档正文 */
.doc-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:16px;flex-wrap:wrap}
.doc-title{font-size:27px;font-weight:800;line-height:1.3;letter-spacing:.2px}
.doc h2{font-size:20px;font-weight:700;margin:30px 0 12px;padding-left:11px;border-left:4px solid var(--primary);line-height:1.4}
.doc h3{font-size:16.5px;font-weight:700;margin:24px 0 9px}
.doc h4{font-size:15px;font-weight:700;margin:18px 0 8px}
.doc p{margin-bottom:13px;color:#374151}
.doc ul,.doc ol{margin:0 0 14px;padding-left:24px}
.doc li{margin-bottom:6px;color:#374151}
.doc li>ul,.doc li>ol{margin:6px 0}
.doc strong{font-weight:700;color:var(--text)}
.doc hr{border:none;border-top:1px solid var(--border);margin:26px 0}
.doc blockquote{margin:0 0 16px;padding:12px 16px;background:var(--soft);border-left:4px solid var(--primary);border-radius:0 10px 10px 0;color:var(--text-2)}
.doc blockquote p:last-child{margin-bottom:0}
.doc code{font-family:"JetBrains Mono",Consolas,"Courier New",monospace;font-size:13px;background:var(--inline-bg);color:#be235e;padding:2px 6px;border-radius:6px}
.doc pre{background:var(--code-bg);border-radius:12px;padding:16px 18px;overflow-x:auto;margin-bottom:16px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.05)}
.doc pre code{background:none;color:var(--code-text);padding:0;font-size:13.5px;line-height:1.7;white-space:pre}
.code-wrap{position:relative;margin-bottom:16px}
.code-wrap .code-copy{position:absolute;top:9px;right:9px;display:flex;align-items:center;gap:5px;font-size:12px;color:#cbd5e1;background:rgba(255,255,255,.1);padding:4px 10px;border-radius:7px;transition:.15s}
.code-wrap .code-copy:hover{background:rgba(255,255,255,.2);color:#fff}
.code-wrap .code-copy.done{background:#16a34a;color:#fff}
.doc table{width:100%;border-collapse:collapse;margin-bottom:16px;font-size:13.5px;border:1px solid var(--border);border-radius:10px;overflow:hidden}
.doc th,.doc td{border:1px solid var(--border);padding:9px 13px;text-align:left;vertical-align:top}
.doc thead th{background:#f8fafc;font-weight:700;color:var(--text)}
.doc tbody tr:nth-child(even){background:#fafbfc}
.doc .table-wrap{overflow-x:auto;margin-bottom:16px;border-radius:10px}
.doc .table-wrap table{margin-bottom:0}

/* 上一篇/下一篇 */
.pager{display:flex;gap:14px;margin-top:34px;padding-top:24px;border-top:1px solid var(--border)}
.pager-item{flex:1;min-width:0;display:flex;flex-direction:column;gap:3px;padding:13px 16px;background:var(--surface);border:1px solid var(--border);border-radius:12px;transition:.15s}
.pager-item:hover{border-color:var(--primary);box-shadow:var(--shadow)}
.pager-item .p-dir{font-size:12px;color:var(--text-3);display:flex;align-items:center;gap:5px}
.pager-item .p-name{font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pager-item.next{align-items:flex-end;text-align:right}
.pager-placeholder{flex:1}

/* 空态 */
.empty{text-align:center;padding:70px 20px;color:var(--text-3)}
.empty .e-ic{display:flex;justify-content:center;margin-bottom:14px;color:#c2cad6}
.empty h3{font-size:17px;color:var(--text);margin-bottom:6px}
.empty a{font-weight:600}

/* 遮罩 & toast */
.overlay{position:fixed;inset:var(--header-h) 0 0 0;background:rgba(15,23,42,.45);opacity:0;pointer-events:none;transition:.22s;z-index:45}
.overlay.open{opacity:1;pointer-events:auto}
.toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,18px);background:#1f2937;color:#fff;font-size:13.5px;padding:10px 20px;border-radius:10px;box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:.22s;z-index:90;display:flex;align-items:center;gap:8px}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast svg{color:#4ade80}

/* 响应式 */
@media (max-width:980px){ .card-grid{grid-template-columns:repeat(2,1fr)} }
@media (max-width:900px){
  #btn-menu{display:flex}
  #btn-search-icon{display:flex}
  .search-box{display:none}
  .search-input{font-size:16px}
  #sidebar{position:fixed;top:var(--header-h);bottom:0;left:0;transform:translateX(-100%);transition:transform .25s ease;box-shadow:var(--shadow-lg)}
  #sidebar.open{transform:translateX(0)}
  body.sidebar-open .overlay{opacity:1;pointer-events:auto}
  #content{padding:22px 18px 50px}
  .home-hero{padding:28px 22px}
  .home-hero h1{font-size:23px}
}
@media (max-width:600px){
  .card-grid{grid-template-columns:1fr}
  .brand-title{font-size:16px}
  .pager{flex-direction:column}
  .doc-title{font-size:22px}
}