:root{
  --bg:#f7f8fa;
  --panel:#ffffff;
  --panel-2:#fbfbfd;
  --line:#e8ebf0;
  --line-2:#dfe3ea;
  --text:#1f2329;
  --text-2:#4e5969;
  --text-3:#86909c;
  --brand:#3370ff;
  --brand-soft:#eef3ff;
  --brand-line:#c9daff;
  --amber:#ff8f1f;
  --amber-soft:#fff6e8;
  --amber-line:#ffe0b8;
  --red:#f54a45;
  --green:#00b42a;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(31,35,41,.04), 0 6px 20px rgba(31,35,41,.06);
  --shadow-sm:0 1px 2px rgba(31,35,41,.05);
  --sidebar-w:296px;
  --topbar-h:60px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:15px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}

/* ---------- progress ---------- */
.progress{
  position:fixed;top:0;left:0;height:3px;width:0%;
  background:linear-gradient(90deg,var(--brand),#6aa1ff);
  z-index:60;transition:width .1s linear;
}

/* ---------- topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  height:var(--topbar-h);
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  height:100%;display:flex;align-items:center;gap:16px;
  padding:0 20px;max-width:1500px;margin:0 auto;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:30px;height:30px;border-radius:9px;flex-shrink:0;
  background:linear-gradient(135deg,#3370ff,#6aa1ff);
  color:#fff;font-weight:700;font-size:12px;letter-spacing:.5px;
  display:flex;align-items:center;justify-content:center;
}
.brand-text{font-weight:600;font-size:15px;white-space:nowrap}

.search{position:relative;flex:1;max-width:520px;display:flex;align-items:center}
.search svg{position:absolute;left:11px;width:16px;height:16px;fill:var(--text-3);pointer-events:none}
.search input{
  width:100%;height:38px;padding:0 34px 0 34px;
  border:1px solid var(--line-2);border-radius:999px;background:var(--panel-2);
  font-size:14px;color:var(--text);outline:none;transition:.16s;
  font-family:inherit;
}
.search input:focus{border-color:var(--brand-line);background:#fff;box-shadow:0 0 0 3px var(--brand-soft)}
.search input::-webkit-search-cancel-button{display:none}
.qclear{
  position:absolute;right:8px;width:22px;height:22px;border:0;border-radius:50%;
  background:var(--line);color:var(--text-2);cursor:pointer;font-size:14px;line-height:1;
  display:none;align-items:center;justify-content:center;padding:0;
}
.qclear.on{display:flex}

.menu-btn{
  display:none;margin-left:auto;width:38px;height:38px;border:1px solid var(--line-2);
  border-radius:10px;background:#fff;cursor:pointer;padding:0;
}
.menu-btn svg{width:18px;height:18px;fill:var(--text-2)}

/* ---------- layout ---------- */
.layout{
  max-width:1500px;margin:0 auto;
  display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr);
  gap:34px;padding:26px 20px 80px;
  align-items:start;
}

/* ---------- sidebar ---------- */
.sidebar{position:sticky;top:calc(var(--topbar-h) + 26px)}
.toc{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:14px 10px 12px;box-shadow:var(--shadow-sm);
  max-height:calc(100vh - var(--topbar-h) - 70px);overflow:auto;
  scrollbar-width:thin;
}
.toc::-webkit-scrollbar{width:6px}
.toc::-webkit-scrollbar-thumb{background:#dfe3ea;border-radius:3px}
.toc-title{
  font-size:12px;font-weight:700;letter-spacing:.14em;color:var(--text-3);
  padding:2px 10px 10px;text-transform:uppercase;
}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{counter-increment:t}
.toc a{
  position:relative;display:block;color:var(--text-2);font-size:13.5px;line-height:1.5;
  padding:7px 10px 7px 30px;border-radius:8px;transition:.15s;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.toc a::before{
  content:counter(t,decimal-leading-zero);
  position:absolute;left:10px;top:7px;font-size:11px;color:#c2c7d0;
  font-family:var(--mono);font-variant-numeric:tabular-nums;
}
.toc a:hover{background:var(--panel-2);color:var(--text);text-decoration:none}
.toc a.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.toc a.active::before{color:var(--brand)}

/* ---------- content ---------- */
.content{min-width:0}

.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(135deg,#eef4ff 0%,#f7f9ff 42%,#fff6f0 100%);
  border:1px solid var(--line);border-radius:18px;
  padding:38px 34px 30px;margin-bottom:22px;
}
.hero-glow{
  position:absolute;right:-90px;top:-110px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(51,112,255,.20),rgba(51,112,255,0) 68%);
  pointer-events:none;
}
.hero h1{
  position:relative;margin:0 0 14px;font-size:31px;line-height:1.35;font-weight:700;letter-spacing:-.2px;
  background:linear-gradient(92deg,#1f2329 10%,#2b4bd6 90%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-meta{display:flex;gap:8px;flex-wrap:wrap;position:relative}
.pill{
  display:inline-block;font-size:12.5px;padding:3px 11px;border-radius:999px;
  background:rgba(255,255,255,.86);color:var(--text-2);border:1px solid var(--line);
}
.pill-ghost{background:transparent}

.notice{border-radius:var(--radius);padding:16px 18px;margin-bottom:16px;border:1px solid}
.notice p{margin:8px 0 0;font-size:14px;color:var(--text-2)}
.notice-blue{background:var(--brand-soft);border-color:var(--brand-line)}
.notice-amber{background:var(--amber-soft);border-color:var(--amber-line)}
.notice-head{font-weight:600;font-size:14.5px;color:var(--text);display:flex;gap:8px;align-items:flex-start}
.notice-amber .notice-head{color:#a4520a}
.emoji{flex-shrink:0}

.doc-section{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 30px 30px;margin-bottom:20px;box-shadow:var(--shadow-sm);
}
.doc-section > h2{
  margin:0 0 20px;font-size:23px;font-weight:700;letter-spacing:-.2px;
  padding-bottom:14px;border-bottom:2px solid var(--brand-soft);
  scroll-margin-top:calc(var(--topbar-h) + 18px);
}
.doc-section h3{
  font-size:16.5px;font-weight:600;color:#d4380d;
  margin:28px 0 12px;padding-left:11px;border-left:3px solid #ff7a45;
  scroll-margin-top:calc(var(--topbar-h) + 18px);
  line-height:1.5;
}
.doc-section h3:first-of-type{margin-top:6px}
.doc-section p{margin:10px 0;font-size:14.5px;color:var(--text-2)}
.sub{color:var(--text-3) !important;font-size:13.5px !important}
.tip{color:var(--text-2)}
.warn{
  display:inline-block;background:#fff1f0;border:1px solid #ffd6d3;color:#c92a24;
  border-radius:8px;padding:7px 12px;font-size:13.5px !important;font-weight:600;margin-top:12px !important;
}
.block-label{font-size:13.5px;color:var(--text-2);font-weight:600;margin:16px 0 8px}

/* ---------- link cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:12px;margin:12px 0 4px}
.card{
  display:block;background:var(--panel-2);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:14px 15px;transition:.18s;color:inherit;
}
.card:hover{
  text-decoration:none;border-color:var(--brand-line);background:#fff;
  box-shadow:var(--shadow);transform:translateY(-1px);
}
.card-top{display:flex;align-items:center;gap:9px;margin-bottom:9px}
.favicon{
  width:24px;height:24px;border-radius:6px;flex-shrink:0;
  background:linear-gradient(135deg,#eef3ff,#dbe7ff);color:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;letter-spacing:-.3px;
}
.favicon.gh{background:#eef0f3;color:#24292f;font-size:10px}
.card-url{
  font-size:12px;color:var(--brand);font-family:var(--mono);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.card-title{font-size:14.5px;font-weight:600;color:var(--text);margin-bottom:5px;line-height:1.55}
.card-desc{
  font-size:13px;color:var(--text-3);line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}

/* ---------- files ---------- */
.files{list-style:none;margin:10px 0;padding:0;display:grid;gap:8px}
.files li{
  display:flex;align-items:center;gap:11px;
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:10px 14px;transition:.16s;
}
.files li:hover{border-color:var(--line-2);background:#fff;box-shadow:var(--shadow-sm)}
.ficon{
  width:28px;height:28px;border-radius:7px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:10px;font-weight:700;letter-spacing:.2px;
  background:#f0f2f5;color:#5b6472;
}
.ficon.doc{background:#eef3ff;color:#2b5fda}
.ficon.pdf{background:#fff1f0;color:#d4380d}
.ficon.xls{background:#eaf7ee;color:#0a8f3c}
.ficon.md{background:#f2f0fd;color:#6a52d8}
.ficon.tx{background:#f4f5f7;color:#5b6472}
.ficon.zip{background:#fff6e8;color:#c47d0a}
.ficon.csv{background:#eaf7ee;color:#0a8f3c}
.fname{flex:1;min-width:0;font-size:14px;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.fsize{font-size:12px;color:var(--text-3);font-family:var(--mono);flex-shrink:0}

/* ---------- link list ---------- */
.links{list-style:none;margin:10px 0;padding:0;display:grid;gap:8px}
.links li{
  display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:10px 14px;font-size:13.5px;
}
.lk{
  flex-shrink:0;font-size:12px;font-weight:600;color:var(--text-2);
  background:#f0f2f5;border-radius:6px;padding:2px 8px;white-space:nowrap;
}
.links a{font-family:var(--mono);font-size:12.5px;word-break:break-all}
.plain{color:var(--text-2);word-break:break-all}
.pwd{font-size:12px;color:#c47d0a;background:var(--amber-soft);border:1px solid var(--amber-line);border-radius:6px;padding:2px 8px;white-space:nowrap}

.bullets{margin:10px 0;padding-left:20px;font-size:14px;color:var(--text-2)}
.bullets li{margin:6px 0}
.bullets.num{list-style:decimal}

/* ---------- prompt / code ---------- */
.prompt{
  margin:10px 0;padding:14px 16px;border-radius:var(--radius-sm);
  background:#f8f9fb;border:1px solid var(--line);border-left:3px solid var(--brand);
  font-size:13.5px;line-height:1.85;color:var(--text-2);
}
.prompt .pb{color:var(--brand);font-weight:700;margin-right:6px}
.prompt[lang="en"]{font-family:var(--mono);font-size:12.5px;line-height:1.9}
.code{
  margin:12px 0;padding:16px 18px;border-radius:var(--radius-sm);
  background:#1f2329;color:#e6e8eb;font-family:var(--mono);font-size:12.5px;line-height:1.7;
  overflow:auto;border:1px solid #2c3138;
}

/* ---------- media ---------- */
.media-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:12px 0}
.media{background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden}
.media-ph{
  height:132px;display:flex;align-items:center;justify-content:center;
  background:
    linear-gradient(135deg,#e9edf5 0%,#f4f6fa 50%,#eaeef6 100%);
  position:relative;
}
.media-ph.media-doc{background:linear-gradient(135deg,#f2f0fd 0%,#f8f7ff 50%,#eef3ff 100%)}
.play{
  width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.92);
  color:var(--brand);display:flex;align-items:center;justify-content:center;
  font-size:14px;box-shadow:var(--shadow-sm);padding-left:3px;
}
.media-doc .play{padding-left:0;color:#6a52d8}
.media-cap{
  padding:9px 12px;font-size:12.5px;color:var(--text-2);
  display:flex;justify-content:space-between;gap:8px;
}
.dur{font-family:var(--mono);font-size:11.5px;color:var(--text-3);flex-shrink:0}

/* ---------- misc blocks ---------- */
.flow{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:12px 0 16px;
}
.flow-item{
  background:var(--brand-soft);border:1px solid var(--brand-line);color:var(--brand);
  border-radius:8px;padding:6px 13px;font-size:13px;font-weight:600;
}
.flow-arrow{color:var(--text-3);font-size:13px}

.quote-card{
  background:#fcfcfd;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:20px 22px;margin:12px 0;
}
.qc-title{font-size:20px;font-weight:700;text-align:center;margin-bottom:16px;letter-spacing:.5px}
.qc-sub{font-size:15px;font-weight:600;margin-bottom:10px}
.qc-label{font-size:14px;font-weight:600;margin-bottom:4px;color:var(--text-2)}
.qc-list{margin:6px 0 12px;padding-left:20px;font-size:13.5px;color:var(--text-2)}

.steps{display:grid;gap:12px;margin:12px 0}
.step{
  background:var(--panel-2);border:1px solid var(--line);border-left:3px solid var(--brand);
  border-radius:var(--radius-sm);padding:14px 16px;
}
.step-h{font-size:13.5px;font-weight:600;color:var(--text);line-height:1.7}

.audio-card{
  display:flex;align-items:center;gap:12px;
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:11px 15px;margin:10px 0;
}
.play-s{
  width:26px;height:26px;border-radius:50%;background:var(--brand-soft);color:var(--brand);
  display:flex;align-items:center;justify-content:center;font-size:11px;padding-left:2px;flex-shrink:0;
}
.audio-name{font-size:13.5px;font-weight:600;flex:1}
.audio-time{font-family:var(--mono);font-size:11.5px;color:var(--text-3)}

.cases{
  background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px 18px;margin:12px 0;
}
.cases-title{font-size:13.5px;font-weight:700;margin-bottom:8px;color:var(--text)}
.cases ul{margin:0;padding-left:18px;font-size:13px;color:var(--text-2);columns:2;column-gap:26px}
.cases li{margin:4px 0;break-inside:avoid}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;margin:14px 0;border:1px solid var(--line);border-radius:var(--radius-sm)}
.data-table{border-collapse:collapse;width:100%;font-size:13px;background:#fff}
.data-table caption{
  text-align:left;padding:10px 14px;font-size:12.5px;font-weight:600;color:var(--text-2);
  background:var(--panel-2);border-bottom:1px solid var(--line);
}
.data-table th{
  background:#f4f6fa;color:var(--text-2);font-weight:600;text-align:left;
  padding:9px 14px;border-bottom:1px solid var(--line);white-space:nowrap;
}
.data-table td{padding:9px 14px;border-bottom:1px solid #f2f4f7;color:var(--text-2);vertical-align:top}
.data-table tr:last-child td{border-bottom:0}
.data-table tr:hover td{background:#fafbfd}
.data-table td:first-child{font-family:var(--mono);color:var(--text-3);text-align:center;white-space:nowrap}

/* ---------- footer ---------- */
.footer{
  margin-top:26px;padding:22px 26px;border-radius:var(--radius);
  background:var(--panel);border:1px solid var(--line);
  font-size:13px;color:var(--text-3);text-align:center;
}
.footer p{margin:6px 0}
.footer .dim{color:#b6bcc6;font-size:12.5px}
.src-link{margin-top:12px !important}
.src-link a{font-weight:600}

/* ---------- totop ---------- */
.totop{
  position:fixed;right:26px;bottom:26px;width:42px;height:42px;border-radius:50%;
  border:1px solid var(--line-2);background:#fff;color:var(--text-2);
  font-size:17px;cursor:pointer;box-shadow:var(--shadow);z-index:40;
  opacity:0;visibility:hidden;transition:.2s;
}
.totop.on{opacity:1;visibility:visible}
.totop:hover{border-color:var(--brand-line);color:var(--brand)}

.scrim{
  position:fixed;inset:0;background:rgba(31,35,41,.34);z-index:45;
  opacity:0;visibility:hidden;transition:.2s;
}
.scrim.on{opacity:1;visibility:visible}

/* ---------- search state ---------- */
.doc-section.hidden,.doc-section h3.hidden,.cards.hidden,.files.hidden,.links.hidden,
.media-grid.hidden,.table-wrap.hidden,.cases.hidden,.flow.hidden,.steps.hidden,.bullets.hidden{display:none}
.no-result{
  display:none;padding:40px 20px;text-align:center;color:var(--text-3);
  background:var(--panel);border:1px dashed var(--line-2);border-radius:var(--radius);
}
.no-result.on{display:block}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  :root{--sidebar-w:250px}
  .hero h1{font-size:26px}
}
@media (max-width:860px){
  .layout{grid-template-columns:1fr;gap:18px;padding:18px 14px 70px}
  .menu-btn{display:block}
  .search{max-width:none}
  .sidebar{
    position:fixed;top:0;left:0;bottom:0;width:290px;z-index:50;
    padding:16px 12px;background:var(--bg);
    transform:translateX(-104%);transition:transform .24s ease;
    overflow:auto;
  }
  .sidebar.on{transform:none}
  .toc{position:static;max-height:none}
  .doc-section{padding:20px 18px 24px}
  .hero{padding:26px 20px 22px}
  .hero h1{font-size:22px}
  .cases ul{columns:1}
  .brand-text{display:none}
  .totop{right:16px;bottom:16px}
}