:root{
  --bg:#0f1116; --panel:#171b22; --panel2:#1e2430; --text:#e8ecf1; --muted:#a9b3c1; --line:#313846; --accent:#67b3ff;
  --card:#151a22; --chip:#202a36;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font:15px/1.65 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
body{display:grid;grid-template-columns:280px 1fr;min-height:100vh}
.sidebar{border-right:1px solid var(--line);padding:24px 18px;position:sticky;top:0;align-self:start;height:100vh;background:linear-gradient(180deg,#131821,#0f1116)}
.brand{font-size:22px;font-weight:800;margin-bottom:18px}
.brand a{color:var(--text)}
.nav{display:grid;gap:8px;margin-bottom:18px}
.nav a{display:block;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}
.sidebar-note{color:var(--muted);font-size:13px}
.main{padding:28px 32px 64px 32px;overflow:auto}
.page-header{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:20px;flex-wrap:wrap}
.page-header h1{margin:0;font-size:34px;line-height:1.15}
.search{width:min(480px,100%);padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--panel);color:var(--text)}
.search-results{position:relative}
.search-results .results-box{position:absolute;right:0;top:8px;width:min(560px,90vw);max-height:60vh;overflow:auto;border:1px solid var(--line);border-radius:14px;background:var(--panel);box-shadow:0 18px 48px rgba(0,0,0,.4);padding:8px}
.search-item{display:block;padding:10px 12px;border-radius:10px}
.search-item:hover{background:var(--panel2);text-decoration:none}
.search-item small{display:block;color:var(--muted)}
.section{margin:28px 0}
.lead{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:20px}
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-top:16px}
.stat{background:var(--panel2);border:1px solid var(--line);border-radius:16px;padding:18px 14px;text-align:center}
.stat .num{display:block;font-size:28px;font-weight:800}
.stat .label{display:block;color:var(--muted);font-size:13px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:14px}
.module-card,.class-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px}
.module-card h3,.class-card h3{margin-top:0}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.chip{display:inline-block;padding:4px 9px;border-radius:999px;background:var(--chip);border:1px solid var(--line);font-size:12px;color:var(--muted)}
.kv{display:grid;grid-template-columns:120px 1fr;gap:8px 12px;margin:12px 0 0}
.kv dt{color:var(--muted)}
.kv dd{margin:0}
table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden}
th,td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#141922}
tr:hover td{background:#141922}
ul.link-list{padding-left:20px}
.steps li{margin:8px 0}
.tree{list-style:none;padding-left:18px}
.tree > li{margin:8px 0;padding-left:10px;border-left:1px dashed var(--line)}
.node-key{font-weight:700}
.node-value{color:var(--muted);margin-top:4px}
.node-note{color:var(--muted);margin:4px 0 0 0}
.muted{color:var(--muted)}
pre{background:#0c1016;border:1px solid var(--line);border-radius:14px;padding:16px;overflow:auto}
@media (max-width: 980px){
  body{grid-template-columns:1fr}
  .sidebar{position:relative;height:auto;border-right:none;border-bottom:1px solid var(--line)}
  .main{padding:20px}
  .page-header h1{font-size:28px}
}


.method-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:14px}
.method-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px}
.method-card h3{margin-top:0}
.sig{margin:10px 0 14px 0;padding:10px 12px;border-radius:12px;background:#0c1016;border:1px solid var(--line);overflow:auto}
.detail-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.mini-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.columns-2{columns:2;column-gap:24px}
.columns-2 li{break-inside:avoid;margin:0 0 8px 0}
ul.compact{padding-left:18px;margin:6px 0}


.deep-dive{border-top:1px solid var(--line);padding-top:8px}
.lead-note{font-size:1.02rem;line-height:1.8}
.deep-reading li{margin-bottom:12px}
.deep-card{min-height:100%}
.deep-mini{margin-top:10px}
.compact-steps li{margin-bottom:8px}
.callout.deep-callout{margin-top:16px;padding:14px 16px;border-radius:16px;background:rgba(120,170,255,.08);border:1px solid var(--line)}
.subsection{margin-top:22px}
.flow-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px}

.guide-card{min-height:100%}
.split-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;margin-top:16px}
.flow-diagram{display:grid;gap:12px;margin:12px 0 8px}.diagram-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.diagram-node{padding:10px 12px;border-radius:14px;border:1px solid var(--line);background:var(--panel2);min-height:44px;display:flex;align-items:center}.diagram-node.lane-label{background:#101722;font-weight:700;color:var(--text)}.diagram-node.route-node{background:rgba(103,179,255,.10)}.diagram-node.db-node{background:rgba(130,210,150,.10)}.diagram-node.action-node{background:rgba(255,205,120,.10)}.diagram-node.process-node{background:rgba(255,255,255,.03)}.diagram-arrow{color:var(--muted);font-weight:700}@media (max-width: 720px){.diagram-row{align-items:flex-start}.diagram-arrow{width:100%;text-align:center;transform:rotate(90deg)}}