:root{
  --bg:#f6f7fb;
  --card:#ffffff;
  --ink:#0f172a;
  --ink2:#475569;
  --ink3:#94a3b8;
  --line:#e2e8f0;
  --brand:#2563eb;
  --brand-soft:#dbeafe;
  --hot:#f97316;
  --cold:#0ea5e9;
  --out:#ef476f;
  --elec:#a78bfa;
  --radius:16px;
  --shadow:0 1px 2px rgba(15,23,42,.05), 0 8px 24px rgba(15,23,42,.07);
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  padding-bottom:env(safe-area-inset-bottom);
}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding:12px 20px;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.logo{font-size:26px;line-height:1}
.brand h1{font-size:19px;margin:0;letter-spacing:.3px}
.brand p{margin:2px 0 0;font-size:12.5px;color:var(--ink3)}
.tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.btn{
  font-family:inherit;font-size:14px;border-radius:10px;border:1px solid var(--line);
  background:#fff;color:var(--ink);padding:8px 14px;cursor:pointer;transition:.15s;
}
.btn:hover{border-color:#cbd5e1;background:#f8fafc}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600;min-width:92px}
.btn.primary:hover{background:#1d4ed8}
.btn.ghost{flex:1}
.seg{display:flex;background:#f1f5f9;border-radius:10px;padding:3px;gap:2px}
.seg button{
  font-family:inherit;font-size:13px;border:0;background:transparent;color:var(--ink2);
  padding:6px 11px;border-radius:8px;cursor:pointer;transition:.15s;white-space:nowrap;
}
.seg button.on{background:#fff;color:var(--brand);font-weight:700;box-shadow:0 1px 3px rgba(15,23,42,.12)}
.chk{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--ink2);cursor:pointer;user-select:none}

/* ---------- tabs ---------- */
.tabs{
  display:flex;gap:8px;overflow-x:auto;padding:12px 20px;background:var(--bg);
  position:sticky;top:61px;z-index:40;border-bottom:1px solid var(--line);
  scrollbar-width:thin;
}
.tabs::-webkit-scrollbar{height:5px}
.tabs::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:9px}
.tab{
  flex:0 0 auto;display:flex;align-items:center;gap:7px;
  font-family:inherit;font-size:13.5px;border:1px solid var(--line);background:#fff;color:var(--ink2);
  padding:8px 13px;border-radius:999px;cursor:pointer;transition:.15s;white-space:nowrap;
}
.tab:hover{border-color:#bfdbfe;color:var(--brand)}
.tab.on{background:var(--ink);border-color:var(--ink);color:#fff;font-weight:600}
.tab .n{font-size:11px;opacity:.55;font-variant-numeric:tabular-nums}

/* ---------- panel ---------- */
main{padding:20px;max-width:1440px;margin:0 auto}
.panel{animation:fade .28s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.p-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:14px}
.p-title-wrap{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.p-no{font-size:13px;font-weight:700;color:var(--ink3);font-variant-numeric:tabular-nums}
.p-icon{font-size:24px}
.p-head h2{font-size:26px;margin:0;letter-spacing:.5px}
.p-tag{font-size:13.5px;color:var(--ink2);background:#fff;border:1px solid var(--line);padding:4px 11px;border-radius:999px}
.readouts{display:flex;gap:8px;flex-wrap:wrap}
.ro{
  background:#fff;border:1px solid var(--line);border-radius:10px;padding:6px 11px;min-width:82px;
}
.ro b{display:block;font-size:10.5px;color:var(--ink3);font-weight:500;letter-spacing:.4px}
.ro span{font-size:15px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--ink)}

.p-body{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:18px;align-items:start}
.viewer{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.stageBox{background:linear-gradient(180deg,#fbfcfe,#f1f5f9);padding:6px}
.stageBox svg{display:block;width:100%;height:auto}
.stageFoot{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap;padding:10px 14px;border-top:1px solid var(--line)}
.annoBar{font-size:13px;color:var(--ink2);flex:1;min-width:220px}
.annoBar b{color:var(--ink)}
.legend{display:flex;gap:12px;flex-wrap:wrap}
.legend span{display:flex;align-items:center;gap:5px;font-size:11.5px;color:var(--ink3)}
.legend i{width:10px;height:10px;border-radius:3px;display:block}

/* ---------- svg bits ---------- */
svg text{font-family:var(--font);user-select:none}
.part{transition:opacity .15s}
svg.hi .part{opacity:.28}
.part.hi{opacity:1!important}
.anno{cursor:pointer}
.anno .dot{transition:.15s}
.anno:hover .dot, .anno.hi .dot{r:8}
.anno .lab{fill:#fff;stroke:#cbd5e1;stroke-width:1.5}
.anno .txt{font-size:15px;font-weight:700;fill:var(--ink)}
.anno:hover .lab{stroke:var(--brand);stroke-width:2.5;fill:#f0f7ff}
.anno:hover .txt{fill:var(--brand)}
.anno.hi .lab{stroke:var(--brand);stroke-width:2.5;fill:#dbeafe}
.anno.off,.part.off{display:none}
.gate{transition:opacity .2s}
.gate.dim{opacity:.18}

/* ---------- side cards ---------- */
.side{display:flex;flex-direction:column;gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.card h3{margin:0 0 10px;font-size:15px;display:flex;align-items:center;gap:7px}
.card .one{margin:0 0 12px;font-size:15.5px;line-height:1.72;font-weight:600;color:var(--ink)}
.steps{margin:0;padding-left:20px;font-size:13.5px;line-height:1.8;color:var(--ink2)}
.steps li{margin-bottom:7px}
.steps li::marker{color:var(--brand);font-weight:700}
.summary{margin:0 0 12px;font-size:13.5px;line-height:1.8;color:var(--ink2)}
.stats{width:100%;border-collapse:collapse;font-size:12.5px;margin-bottom:12px}
.stats td{padding:7px 0;border-bottom:1px dashed var(--line);vertical-align:top;line-height:1.55}
.stats td:first-child{color:var(--ink3);white-space:nowrap;padding-right:12px;width:88px}
.stats td:last-child{color:var(--ink);font-weight:600}
.fun{font-size:12.5px;line-height:1.75;color:#92400e;background:#fef3c7;border-radius:10px;padding:10px 12px}
.fun b{color:#78350f}
.navCard{display:flex;gap:10px;padding:12px}

/* ---------- footer ---------- */
footer{max-width:1440px;margin:0 auto;padding:8px 20px 40px;color:var(--ink3);font-size:12.5px;line-height:1.9}
footer p{margin:2px 0}
footer .dim{opacity:.75}
kbd{display:inline-block;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:0 6px;margin:0 2px;background:#fff;font-size:11.5px;font-family:var(--font)}

@media (max-width:1080px){
  .p-body{grid-template-columns:1fr}
  .side{flex-direction:row;flex-wrap:wrap}
  .side .card{flex:1 1 300px}
  .navCard{flex-basis:100%}
}
@media (max-width:640px){
  main{padding:14px}
  .topbar{padding:10px 14px}
  .brand p{display:none}
  .tabs{top:55px;padding:10px 14px}
  .p-head h2{font-size:21px}
}