/* ============================================================
   精细化学品课程知识图谱 · 样式
   ============================================================ */
:root{
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --bg-softer:#f1f5f9;
  --line:#e5e9f0;
  --line-strong:#cbd5e1;
  --text:#0f172a;
  --text-2:#475569;
  --muted:#7c8798;
  --accent:#2563eb;
  --accent-soft:#eff4ff;
  --shadow:0 1px 2px rgba(15,23,42,.04), 0 8px 24px -12px rgba(15,23,42,.18);
  --radius:12px;
  --sans:"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --mono:"JetBrains Mono","Cascadia Code",Consolas,"Courier New",monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);
  font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
button{font-family:inherit}

/* ---------------- 顶栏 ---------------- */
.topbar{
  position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);padding:12px 22px;display:flex;align-items:center;gap:20px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  width:38px;height:38px;border-radius:11px;flex:none;
  background:linear-gradient(140deg,#2563eb,#0891b2 55%,#7c3aed);
  display:grid;place-items:center;color:#fff;font-weight:700;font-size:15px;letter-spacing:.5px;
  box-shadow:0 6px 16px -6px rgba(37,99,235,.7);
}
.brand h1{font-size:17px;margin:0;font-weight:650;letter-spacing:.2px;white-space:nowrap}
.brand p{margin:1px 0 0;font-size:12px;color:var(--muted)}
.topbar-stats{display:flex;gap:8px;flex-wrap:wrap}
.stat{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:9px;padding:5px 11px;text-align:center;min-width:62px;
}
.stat b{display:block;font-size:15px;font-weight:660;color:var(--text);line-height:1.25}
.stat span{font-size:11px;color:var(--muted);white-space:nowrap}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.searchbox{position:relative}
.searchbox input{
  width:250px;padding:8px 12px 8px 32px;border:1px solid var(--line-strong);border-radius:9px;font-size:13px;
  background:#fff;color:var(--text);outline:none;transition:.15s;
}
.searchbox input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);width:290px}
.searchbox .ico{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:13px;pointer-events:none}
.suggest{
  position:absolute;top:calc(100% + 6px);left:0;width:100%;max-height:340px;overflow:auto;background:#fff;
  border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:5px;display:none;z-index:60;
}
.suggest.on{display:block}
.suggest-item{padding:7px 9px;border-radius:7px;cursor:pointer;display:flex;gap:8px;align-items:center}
.suggest-item:hover,.suggest-item.active{background:var(--accent-soft)}
.suggest-item .tag{font-size:10px;color:#fff;border-radius:5px;padding:1px 6px;flex:none}
.suggest-item .nm{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 视图切换 */
.tabs{display:flex;background:var(--bg-softer);border-radius:10px;padding:3px;gap:2px}
.tabs button{
  border:0;background:transparent;padding:7px 13px;border-radius:8px;font-size:13px;color:var(--text-2);cursor:pointer;
  transition:.15s;white-space:nowrap;
}
.tabs button:hover{color:var(--text)}
.tabs button.on{background:#fff;color:var(--accent);font-weight:600;box-shadow:0 1px 3px rgba(15,23,42,.08)}

/* ---------------- 主布局 ---------------- */
.layout{display:grid;grid-template-columns:252px minmax(0,1fr) 380px;gap:0;height:calc(100vh - 63px);min-height:560px}
.panel{overflow:auto;background:#fff}
.panel::-webkit-scrollbar{width:9px;height:9px}
.panel::-webkit-scrollbar-thumb{background:#dfe5ee;border-radius:9px;border:2px solid #fff}
.panel::-webkit-scrollbar-thumb:hover{background:#c8d1de}
.sidebar{border-right:1px solid var(--line);padding:16px 14px 40px}
.detail{border-left:1px solid var(--line);padding:16px 18px 60px}
.stage{position:relative;background:#fff;overflow:hidden}

/* ---------------- 侧栏组件 ---------------- */
.block{margin-bottom:20px}
.block-title{
  font-size:11.5px;font-weight:700;letter-spacing:.9px;color:var(--muted);text-transform:uppercase;
  display:flex;align-items:center;justify-content:space-between;margin-bottom:9px;
}
.block-title .hint{font-weight:400;text-transform:none;letter-spacing:0;color:#a8b0bd;font-size:11px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{
  display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;color:var(--text-2);
  border-radius:20px;padding:4px 10px;font-size:12px;cursor:pointer;transition:.13s;user-select:none;
}
.chip:hover{border-color:var(--line-strong);background:var(--bg-soft)}
.chip .dot{width:8px;height:8px;border-radius:50%;flex:none}
.chip.off{opacity:.4;background:var(--bg-soft)}
.chip.on{border-color:currentColor;font-weight:600}
.chip .n{font-size:10.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.switch-row{display:flex;align-items:center;justify-content:space-between;padding:6px 0;font-size:13px;color:var(--text-2)}
.switch{position:relative;width:38px;height:21px;flex:none}
.switch input{opacity:0;width:0;height:0;position:absolute}
.slider{position:absolute;inset:0;background:#d6dde8;border-radius:20px;transition:.18s;cursor:pointer}
.slider:before{content:"";position:absolute;width:15px;height:15px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.18s;box-shadow:0 1px 2px rgba(0,0,0,.2)}
.switch input:checked + .slider{background:var(--accent)}
.switch input:checked + .slider:before{transform:translateX(17px)}
.btn{
  border:1px solid var(--line-strong);background:#fff;color:var(--text-2);border-radius:8px;padding:6px 11px;font-size:12.5px;
  cursor:pointer;transition:.13s;
}
.btn:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:#1d4fd8;color:#fff}
.btn-row{display:flex;gap:7px;flex-wrap:wrap}
.side-note{font-size:11.5px;color:var(--muted);line-height:1.65;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:10px 11px}

/* ---------------- 画布 ---------------- */
#graph{display:block;width:100%;height:100%;cursor:grab}
#graph.dragging{cursor:grabbing}
.stage-toolbar{
  position:absolute;top:12px;left:12px;display:flex;gap:7px;background:rgba(255,255,255,.94);border:1px solid var(--line);
  border-radius:10px;padding:6px;box-shadow:var(--shadow);z-index:5;flex-wrap:wrap;max-width:calc(100% - 24px);
}
.stage-toolbar .btn{padding:5px 9px;font-size:12px;border-color:transparent;background:transparent}
.stage-toolbar .btn:hover{background:var(--accent-soft);border-color:transparent}
.stage-toolbar .sep{width:1px;background:var(--line);margin:2px 3px}
.breadcrumb{
  position:absolute;top:12px;right:12px;background:rgba(255,255,255,.94);border:1px solid var(--line);border-radius:10px;
  padding:7px 12px;font-size:12.5px;color:var(--text-2);box-shadow:var(--shadow);z-index:5;max-width:60%;
  display:flex;align-items:center;gap:8px;
}
.breadcrumb b{color:var(--text);font-weight:600}
.legend{
  position:absolute;left:12px;bottom:12px;background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:10px;
  padding:10px 12px;box-shadow:var(--shadow);z-index:5;font-size:11.5px;color:var(--text-2);max-width:280px;
}
.legend h4{margin:0 0 7px;font-size:11px;letter-spacing:.8px;color:var(--muted);text-transform:uppercase;font-weight:700}
.legend .lg-row{display:flex;align-items:center;gap:8px;margin:3px 0;cursor:pointer;border-radius:6px;padding:1px 4px}
.legend .lg-row:hover{background:var(--bg-soft)}
.legend .lg-row.off{opacity:.35}
.legend .lg-line{width:22px;height:0;border-top-width:2px;border-top-style:solid;flex:none}
.legend .lg-dot{width:11px;height:11px;border-radius:50%;flex:none}
.legend .toggler{margin-top:7px;border-top:1px dashed var(--line);padding-top:6px;color:var(--muted);cursor:pointer;font-size:11px}
.tooltip{
  position:absolute;pointer-events:none;background:rgba(15,23,42,.94);color:#fff;font-size:12px;line-height:1.5;
  padding:7px 10px;border-radius:8px;max-width:280px;z-index:30;opacity:0;transition:opacity .12s;box-shadow:0 6px 20px -6px rgba(0,0,0,.5);
}
.tooltip.on{opacity:1}
.tooltip .tt-title{font-weight:650;margin-bottom:2px}
.tooltip .tt-sub{color:#c7d2e0;font-size:11px}

/* ---------------- 详情面板 ---------------- */
.detail-empty{color:var(--muted);font-size:13px;line-height:1.9;padding-top:6px}
.detail-empty .kbd{font-family:var(--mono);font-size:11px;background:var(--bg-softer);border:1px solid var(--line);border-radius:5px;padding:1px 5px}
.d-head{border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:14px}
.d-badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;color:#fff;border-radius:6px;padding:2px 8px;margin-bottom:8px}
.d-title{font-size:17px;font-weight:660;line-height:1.4;margin:0 0 6px}
.d-sub{font-size:12px;color:var(--muted)}
.d-desc{font-size:13.2px;color:var(--text-2);line-height:1.75;background:var(--bg-soft);border-left:3px solid var(--accent);border-radius:0 8px 8px 0;padding:9px 12px;margin:12px 0}
.d-sec{margin:16px 0}
.d-sec h4{
  font-size:11.5px;letter-spacing:.8px;text-transform:uppercase;color:var(--muted);margin:0 0 8px;font-weight:700;
  display:flex;align-items:center;justify-content:space-between;
}
.kv{display:grid;grid-template-columns:74px 1fr;gap:4px 10px;font-size:12.6px}
.kv dt{color:var(--muted)}
.kv dd{margin:0;color:var(--text-2)}
.rel-item{
  border:1px solid var(--line);border-radius:10px;padding:9px 11px;margin-bottom:7px;cursor:pointer;transition:.13s;background:#fff;
}
.rel-item:hover{border-color:var(--accent);box-shadow:0 4px 14px -10px rgba(37,99,235,.6);transform:translateY(-1px)}
.rel-top{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:3px}
.rel-type{font-size:10.5px;font-weight:600;color:#fff;border-radius:5px;padding:1px 7px;flex:none}
.rel-course{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:5px;padding:0 6px}
.rel-name{font-size:13px;font-weight:600;color:var(--text)}
.rel-note{font-size:12.3px;color:var(--text-2);line-height:1.65}
.tag-list{display:flex;flex-wrap:wrap;gap:5px}
.tag{font-size:11.5px;color:var(--text-2);background:var(--bg-softer);border-radius:6px;padding:2px 8px}
ul.tight{margin:6px 0 0;padding-left:18px;font-size:12.6px;color:var(--text-2);line-height:1.7}
ul.tight li{margin-bottom:3px}

/* ---------------- 矩阵视图 ---------------- */
.doc{padding:26px 30px 70px;max-width:1500px}
.doc h2{font-size:21px;margin:0 0 4px;font-weight:660}
.doc .lead{color:var(--text-2);font-size:13.4px;line-height:1.85;margin:0 0 22px;max-width:1000px}
.matrix-wrap{overflow:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table.matrix{border-collapse:separate;border-spacing:0;font-size:12.5px;background:#fff;width:100%}
table.matrix th,table.matrix td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);padding:7px 8px;text-align:center}
table.matrix thead th{
  position:sticky;top:0;background:#fbfcfe;z-index:3;font-weight:600;color:var(--text-2);white-space:nowrap;font-size:11.5px;
  vertical-align:bottom;height:104px;
}
table.matrix thead th.rot{padding:6px 4px}
table.matrix thead th.rot div{writing-mode:vertical-rl;transform:rotate(180deg);margin:0 auto;letter-spacing:.5px;max-height:92px;overflow:hidden}
table.matrix th.unit-col{text-align:left;position:sticky;left:0;background:#fbfcfe;z-index:2;min-width:186px;font-weight:600;color:var(--text)}
table.matrix thead th.unit-col{z-index:4}
table.matrix td.cell{cursor:pointer;font-weight:600;font-variant-numeric:tabular-nums;transition:.12s;min-width:44px}
table.matrix td.cell:hover{outline:2px solid var(--accent);outline-offset:-2px}
table.matrix td.cell.zero{color:#cbd5e1;font-weight:400;cursor:default}
table.matrix tbody tr:hover th.unit-col{color:var(--accent)}
table.matrix th.grp,table.matrix td.grp{border-left:2px solid var(--line-strong)}
table.matrix tbody tr:last-child th,table.matrix tbody tr:last-child td{border-bottom:0}
table.matrix th:last-child,table.matrix td:last-child{border-right:0}
.matrix-legend{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted);margin:12px 0 26px}
.matrix-legend .swatches{display:flex;gap:3px}
.matrix-legend .sw{width:22px;height:13px;border-radius:3px;border:1px solid var(--line)}

/* ---------------- 列表视图 ---------------- */
.rel-list{display:grid;gap:18px}
.unit-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#fff}
.unit-card > header{padding:13px 16px;background:linear-gradient(180deg,#fbfcfe,#f7f9fc);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.unit-card header .idx{width:26px;height:26px;border-radius:8px;display:grid;place-items:center;color:#fff;font-size:12.5px;font-weight:700;flex:none}
.unit-card header h3{margin:0;font-size:15px;font-weight:650}
.unit-card header .meta{font-size:11.5px;color:var(--muted);margin-left:auto;display:flex;gap:12px;flex-wrap:wrap}
.pt-block{padding:12px 16px;border-top:1px dashed var(--line)}
.pt-block:first-of-type{border-top:0}
.pt-head{display:flex;align-items:baseline;gap:9px;margin-bottom:5px}
.pt-head .code{font-family:var(--mono);font-size:11px;color:var(--muted);flex:none}
.pt-head .nm{font-size:13.6px;font-weight:620}
.pt-head .cnt{margin-left:auto;font-size:11px;color:var(--muted);flex:none}
.pt-desc{font-size:12.6px;color:var(--muted);margin:0 0 8px;line-height:1.7}
.rel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:8px}
.rel-mini{border:1px solid var(--line);border-radius:9px;padding:8px 10px;font-size:12.3px;color:var(--text-2);background:#fff}
.rel-mini .top{display:flex;gap:6px;align-items:center;margin-bottom:3px;flex-wrap:wrap}
.rel-mini .target{font-weight:600;color:var(--text);font-size:12.6px}

/* ---------------- 课程链路视图 ---------------- */
.lane-grid{display:grid;grid-template-columns:1fr 1.35fr 1fr;gap:18px;align-items:start}
.lane{border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);overflow:hidden}
.lane > header{padding:11px 15px;font-size:13px;font-weight:650;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:8px}
.lane > header .pill{font-size:10.5px;font-weight:600;color:#fff;padding:1px 8px;border-radius:20px}
.lane .body{padding:11px 13px;display:grid;gap:9px}
.course-block{border:1px solid var(--line);border-radius:10px;padding:10px 11px;background:#fff;transition:.14s;cursor:default}
.course-block:hover{border-color:var(--line-strong);box-shadow:0 6px 18px -14px rgba(15,23,42,.5)}
.course-block .cb-head{display:flex;align-items:center;gap:8px;margin-bottom:5px}
.course-block .cb-head b{font-size:13.2px;font-weight:640}
.course-block .cb-head .n{margin-left:auto;font-size:11px;color:var(--muted)}
.course-block .cb-desc{font-size:12px;color:var(--muted);line-height:1.65;margin:0 0 7px}
.course-block .cpt{display:flex;flex-wrap:wrap;gap:4px}
.course-block .cpt span{font-size:11px;color:var(--text-2);background:var(--bg-softer);border-radius:5px;padding:1px 7px}
.flow-arrow{display:flex;align-items:center;justify-content:center;color:var(--line-strong);font-size:22px;padding:8px 0}
.unit-flow{border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);margin-top:22px;overflow:hidden}
.unit-flow > header{padding:12px 16px;border-bottom:1px solid var(--line);font-weight:650;font-size:14px;display:flex;gap:10px;align-items:center}
.unit-flow .row{display:grid;grid-template-columns:200px 1fr;gap:14px;padding:11px 16px;border-bottom:1px dashed var(--line)}
.unit-flow .row:last-child{border-bottom:0}
.unit-flow .row .u{font-size:13px;font-weight:620;display:flex;gap:8px;align-items:flex-start}
.unit-flow .row .u .idx{width:20px;height:20px;border-radius:6px;color:#fff;font-size:11px;display:grid;place-items:center;flex:none;margin-top:1px}
.unit-flow .row .links{display:flex;flex-wrap:wrap;gap:6px}
.linkpill{display:inline-flex;align-items:center;gap:6px;font-size:11.8px;border:1px solid var(--line);border-radius:20px;padding:2px 10px;color:var(--text-2);background:#fff}
.linkpill .dot{width:7px;height:7px;border-radius:50%;flex:none}
.linkpill b{font-weight:600;color:var(--text)}

/* ---------------- 综述区 ---------------- */
.overview{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-bottom:26px}
.ov-card{border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;background:#fff;box-shadow:var(--shadow)}
.ov-card .num{font-size:26px;font-weight:680;line-height:1.1}
.ov-card .lb{font-size:12px;color:var(--muted);margin-top:3px}
.ov-card p{font-size:12.4px;color:var(--text-2);margin:9px 0 0;line-height:1.7}
.hidden{display:none !important}
.footer-note{
  padding:18px 22px 34px;color:var(--muted);font-size:12px;line-height:1.8;border-top:1px solid var(--line);margin-top:10px;
}
.footer-note b{color:var(--text-2)}
@media (max-width:1280px){
  .layout{grid-template-columns:230px minmax(0,1fr) 330px}
}
@media (max-width:1080px){
  .layout{grid-template-columns:1fr;height:auto}
  .sidebar,.detail{border:0;border-bottom:1px solid var(--line)}
  .stage{height:70vh;order:-1;border-bottom:1px solid var(--line)}
  .lane-grid{grid-template-columns:1fr}
}