/* ========== 图解 Agent · 静态站点样式 ========== */
:root{
  --bg:#0f1218; --panel:#171c25; --panel2:#1c222d; --fg:#e3e8f0; --mut:#8d9aae;
  --line:#2a3240; --acc:#5aa9ff; --acc2:#4ecb8d; --codebg:#0d1117;
  --bar:rgba(15,18,24,.88); --maxw:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);
  font:16px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:#2f5c8f;color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#2f3846;border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:#3c4757}
::-webkit-scrollbar-track{background:transparent}

/* ---------- 顶栏 ---------- */
.progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--acc),var(--acc2));transition:width .1s linear}
.topbar{position:sticky;top:0;z-index:50;background:var(--bar);
  backdrop-filter:saturate(150%) blur(10px);border-bottom:1px solid var(--line)}
.tb{max-width:var(--maxw);margin:0 auto;padding:0 22px;height:56px;
  display:flex;align-items:center;gap:14px}
.brand{display:flex;align-items:center;gap:9px;color:var(--fg);font-weight:700;
  font-size:16px;flex:none;letter-spacing:.3px}
.brand:hover{color:var(--acc);text-decoration:none}
.brand svg{display:block}
.crumb{color:var(--mut);font-size:13.5px;flex:1;min-width:0;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap;border-left:1px solid var(--line);padding-left:14px}
.tb-nav{display:flex;gap:8px;flex:none}
.tb-nav a{width:32px;height:32px;display:grid;place-items:center;border-radius:8px;
  border:1px solid var(--line);background:var(--panel);color:var(--mut);font-size:15px}
.tb-nav a:hover{color:var(--acc);border-color:var(--acc);text-decoration:none}
.tb-nav a.off{opacity:.3;pointer-events:none}

/* ---------- 目录页 ---------- */
.home{max-width:var(--maxw);margin:0 auto;padding:44px 22px 80px}
.hero{padding-bottom:26px;border-bottom:1px solid var(--line)}
.hero h1{font-size:33px;margin:0 0 12px;letter-spacing:.5px}
.hero h1 span{color:var(--acc)}
.hero .lead{color:var(--mut);margin:0;font-size:15px;max-width:780px;line-height:1.75}

/* 双栏：左侧分组导航 + 右侧内容 */
.cols{display:grid;grid-template-columns:236px minmax(0,1fr);gap:38px;
  align-items:start;margin-top:34px}
.sidenav{position:sticky;top:78px;display:flex;flex-direction:column;gap:4px}
.sidenav a{display:flex;align-items:center;gap:9px;padding:9px 12px;border-radius:9px;
  color:var(--mut);font-size:14px;border:1px solid transparent;line-height:1.4;
  transition:background .16s,color .16s,border-color .16s}
.sidenav a:hover{background:var(--panel);color:var(--fg);border-color:var(--line);
  text-decoration:none}
.sidenav a.on{background:var(--panel2);color:var(--fg);border-color:var(--c)}
.sidenav a.on .nc{background:var(--c);color:#0f1218}
.sidenav .ic{flex:none;font-size:15px;line-height:1}
.sidenav .nm{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nc{flex:none;font:600 12px/1 "JetBrains Mono",Consolas,monospace;background:var(--panel2);
  color:var(--mut);padding:3px 8px;border-radius:999px;transition:.16s}

/* 分组卡片 */
.group{background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:20px 24px;margin-bottom:20px;scroll-margin-top:76px}
.ghead{display:flex;align-items:flex-start;gap:14px;padding-bottom:15px;
  border-bottom:1px solid var(--line)}
.gicon{font-size:25px;line-height:1.15;flex:none}
.ghead .gt{min-width:0;flex:1}
.ghead h2{margin:0 0 4px;font-size:18.5px}
.ghead p{margin:0;color:var(--mut);font-size:13.5px;line-height:1.6}
.count{flex:none;color:var(--c);font-size:12.5px;white-space:nowrap;
  border:1px solid var(--c);padding:3px 10px;border-radius:999px;margin-top:3px}
ul.items{list-style:none;margin:0;padding:0}
ul.items>li{display:flex;gap:14px;padding:14px 4px;border-bottom:1px dashed var(--line)}
ul.items>li:last-child{border-bottom:none;padding-bottom:2px}
.num{flex:none;width:26px;height:26px;border-radius:7px;background:var(--panel2);
  color:var(--mut);font:600 13px/1 "JetBrains Mono",Consolas,monospace;
  display:grid;place-items:center;margin-top:2px;transition:.16s}
ul.items>li:hover .num{background:var(--c);color:#0f1218}
.item-body{min-width:0;flex:1}
.t{color:var(--fg);font-size:15.5px;font-weight:600;display:block;line-height:1.6}
.t:hover{color:var(--c);text-decoration:none}
.sub{display:flex;flex-wrap:wrap;gap:12px;color:var(--mut);font-size:12.5px;margin:4px 0 0}
.subs{margin-top:8px}
.subs summary{cursor:pointer;color:var(--mut);font-size:12.5px;list-style:none;
  display:inline-flex;align-items:center;gap:5px;user-select:none}
.subs summary::-webkit-details-marker{display:none}
.subs summary::before{content:"▸";font-size:11px;transition:transform .18s;display:inline-block}
.subs[open] summary::before{transform:rotate(90deg)}
.subs summary:hover{color:var(--c)}
.subs ol{margin:10px 0 2px;padding:0 0 0 4px;list-style:none;
  border-left:2px solid var(--line);display:grid;gap:6px}
.subs ol a{display:block;color:var(--mut);font-size:13.5px;padding:2px 0 2px 14px;
  line-height:1.5;border-left:2px solid transparent;margin-left:-2px}
.subs ol a:hover{color:var(--c);border-left-color:var(--c);text-decoration:none}

/* ---------- 章节页 ---------- */
.layout{max-width:var(--maxw);margin:0 auto;padding:34px 22px 70px;
  display:grid;grid-template-columns:minmax(0,1fr) 258px;gap:46px;align-items:start}
.doc{min-width:0;max-width:830px}
.doc h1{font-size:31px;line-height:1.4;margin:0 0 10px;letter-spacing:.2px}
.doc-tag{display:flex;flex-wrap:wrap;gap:10px;color:var(--mut);font-size:13px;
  margin:0 0 30px;padding-bottom:22px;border-bottom:1px solid var(--line)}
.doc-tag i{font-style:normal;background:var(--panel);border:1px solid var(--line);
  border-radius:20px;padding:3px 11px}
article h2{font-size:23px;margin:46px 0 15px;padding-bottom:9px;
  border-bottom:1px solid var(--line);scroll-margin-top:76px}
article h3{font-size:19px;margin:32px 0 12px;color:#cfe0f5;scroll-margin-top:76px}
article h4{font-size:17px;margin:24px 0 10px;color:#bccbdd;scroll-margin-top:76px}
article p{margin:15px 0}
article img{max-width:100%;height:auto;display:block;margin:22px auto;border-radius:8px;
  background:#fff;cursor:zoom-in}
article figure{margin:22px 0}
article figcaption{text-align:center;color:var(--mut);font-size:13px;margin-top:8px}
article ul,article ol{padding-left:26px}
article li{margin:7px 0}
article blockquote{margin:18px 0;padding:11px 17px;border-left:3px solid var(--acc);
  background:var(--panel);color:var(--mut);border-radius:0 7px 7px 0}
article blockquote p{margin:6px 0}
article hr{border:0;border-top:1px solid var(--line);margin:34px 0}
article strong{color:#fff}
article table{border-collapse:collapse;width:100%;margin:22px 0;font-size:14.5px;
  display:block;overflow-x:auto}
article th,article td{border:1px solid var(--line);padding:9px 13px;text-align:left}
article th{background:#212936;white-space:nowrap}
article tr:nth-child(even) td{background:#171c24}
article code{font-family:"JetBrains Mono",Consolas,"Courier New",monospace;font-size:13.5px}
article :not(pre)>code{background:#232a35;color:#ffb787;padding:2px 6px;border-radius:4px}
.codewrap{position:relative;margin:20px 0}
.codewrap pre{background:var(--codebg);border:1px solid var(--line);border-radius:9px;
  padding:15px 17px;overflow:auto;margin:0}
.copy{position:absolute;top:9px;right:9px;background:#1b2230;border:1px solid var(--line);
  color:var(--mut);border-radius:6px;padding:4px 10px;font-size:12px;cursor:pointer;
  opacity:0;transition:.16s;font-family:inherit}
.codewrap:hover .copy{opacity:1}
.copy:hover{color:var(--acc);border-color:var(--acc)}
.copy.done{color:var(--acc2);border-color:var(--acc2)}

/* 章内目录 */
.toc{position:sticky;top:78px;max-height:calc(100vh - 108px);overflow-y:auto;
  font-size:13.5px;padding-right:4px}
.toc>summary{cursor:pointer;color:var(--fg);font-weight:600;font-size:13px;
  letter-spacing:.6px;text-transform:uppercase;list-style:none;margin-bottom:12px;
  display:flex;align-items:center;gap:7px;user-select:none}
.toc>summary::-webkit-details-marker{display:none}
.toc>summary::before{content:"";width:3px;height:13px;background:var(--acc);border-radius:2px}
.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc a{display:block;color:var(--mut);padding:5px 0 5px 13px;line-height:1.5;
  border-left:2px solid transparent;margin-left:-1px;transition:.14s}
.toc a:hover{color:var(--fg);text-decoration:none}
.toc a.lv3{padding-left:26px;font-size:12.8px;opacity:.82}
.toc a.on{color:var(--acc);border-left-color:var(--acc);background:rgba(90,169,255,.07)}

/* 上下篇 */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:56px 0 0;
  padding-top:30px;border-top:1px solid var(--line)}
.pg{background:var(--panel);border:1px solid var(--line);border-radius:11px;
  padding:15px 18px;transition:.18s;min-width:0}
.pg:hover{border-color:var(--acc);background:var(--panel2);text-decoration:none}
.pg span{display:block;color:var(--mut);font-size:12px;margin-bottom:6px}
.pg b{display:block;color:var(--fg);font-size:14.5px;font-weight:600;line-height:1.5}
.pg.next{text-align:right}
.pg.ph{visibility:hidden}
.backtop{display:block;text-align:center;color:var(--mut);font-size:13.5px;margin-top:26px}

/* 灯箱 */
.lb{position:fixed;inset:0;z-index:99;background:rgba(6,8,12,.94);display:none;
  place-items:center;padding:26px;cursor:zoom-out}
.lb.on{display:grid}
.lb img{max-width:100%;max-height:100%;border-radius:8px;background:#fff}

/* 404 */
.nf{max-width:600px;margin:0 auto;padding:130px 22px;text-align:center}
.nf b{display:block;font:700 76px/1 "JetBrains Mono",Consolas,monospace;color:var(--acc);
  opacity:.35;margin-bottom:18px}
.nf h1{font-size:24px;margin:0 0 12px}
.nf p{color:var(--mut);margin:0 0 28px}
.btn{display:inline-block;background:var(--acc);color:#0f1218;font-weight:600;
  border-radius:9px;padding:11px 26px;font-size:15px}
.btn:hover{text-decoration:none;filter:brightness(1.1)}

/* ---------- 响应式 ---------- */
@media(max-width:1080px){
  .layout{grid-template-columns:1fr;gap:0;max-width:860px}
  .toc{position:static;max-height:none;margin:0 0 30px;background:var(--panel);
    border:1px solid var(--line);border-radius:10px;padding:14px 16px}
  .toc>summary{margin-bottom:0}
  .toc[open]>summary{margin-bottom:12px}
  .doc{max-width:none}
}
@media(max-width:880px){
  .cols{grid-template-columns:1fr;gap:22px}
  .sidenav{position:static;flex-direction:row;flex-wrap:wrap}
  .sidenav a{background:var(--panel);border-color:var(--line);padding:7px 12px}
  .sidenav .nm{max-width:none}
}
@media(max-width:640px){
  .hero h1{font-size:26px}
  .group{padding:16px 16px;border-radius:12px}
  .ghead{gap:11px}
  .gicon{font-size:21px}
  .ghead h2{font-size:16.5px}
  .count{display:none}
  .sidenav a{font-size:13px}
  .doc h1{font-size:24px}
  article h2{font-size:20px}
  article h3{font-size:17.5px}
  .layout{padding:26px 16px 60px}
  .home{padding:34px 16px 70px}
  .tb{padding:0 16px;gap:10px}
  .crumb{display:none}
  .pager{grid-template-columns:1fr}
  .pg.ph{display:none}
}