/* ============================================================
   电动减温减压装置 · 三维结构演示
   ============================================================ */

:root{
  --bg:#f4f6f8;
  --bg-2:#eceff3;
  --panel:#ffffff;
  --panel-2:#f7f9fb;
  --line:rgba(18,28,40,.10);
  --line-strong:rgba(18,28,40,.18);
  --txt:#131a24;
  --muted:#5b6877;
  --dim:#8b97a5;
  --accent:#e85f27;
  --accent-soft:rgba(232,95,39,.10);
  --cyan:#0d9691;
  --cyan-soft:rgba(13,150,145,.10);
  --ok:#4f931f;
  --mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --sans:"Inter","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --r:14px;
  --maxw:1320px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--txt);
  font-family:var(--sans);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
::selection{background:rgba(232,95,39,.22);color:#43160a}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
img,svg{display:block}
.mono{font-family:var(--mono);letter-spacing:.04em}
.skip-link{position:absolute;left:-9999px;top:0;z-index:99;padding:10px 16px;background:var(--accent);color:#fff;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* ---------- topbar ---------- */
.topbar{
  position:fixed;inset:0 0 auto 0;z-index:50;
  background:#fafbfd;
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 10px rgba(18,28,40,.05);
  transition:background .3s ease;
}
.topbar-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 28px;height:64px;
  display:flex;align-items:center;gap:32px;
}
.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}
.brand-mark{width:30px;height:30px;color:var(--accent);display:grid;place-items:center}
.brand-mark svg{width:100%;height:100%}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:13.5px;letter-spacing:.02em;font-weight:600}
.brand-text i{font-family:var(--mono);font-style:normal;font-size:8.5px;letter-spacing:.16em;color:var(--dim)}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{
  font-size:13px;color:var(--muted);padding:8px 14px;border-radius:999px;
  transition:color .2s,background .2s;
}
.nav a:hover{color:var(--txt);background:rgba(18,28,40,.05)}
.nav-toggle{
  display:none;margin-left:auto;width:40px;height:40px;flex-direction:column;
  align-items:center;justify-content:center;gap:5px;flex-shrink:0;
  border:1px solid var(--line-strong);border-radius:8px;background:transparent;cursor:pointer;
}
.nav-toggle span{display:block;width:16px;height:1.5px;background:var(--txt);transition:transform .22s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(3.25px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.25px) rotate(-45deg)}
.topbar-tag{
  display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:9.5px;
  letter-spacing:.14em;color:var(--dim);border-left:1px solid var(--line);padding-left:20px;
}
.pulse{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 0 rgba(56,214,207,.5);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(56,214,207,.45)}70%{box-shadow:0 0 0 8px rgba(56,214,207,0)}100%{box-shadow:0 0 0 0 rgba(56,214,207,0)}}

/* ---------- hero ---------- */
.hero{
  position:relative;min-height:auto;padding:132px 28px 56px;
  display:flex;flex-direction:column;justify-content:flex-start;
  overflow:hidden;border-bottom:1px solid var(--line);
}
.hero-grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(18,28,40,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,28,40,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(120% 100% at 62% 42%,#000 20%,transparent 78%);
}
.hero-grid::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(60% 50% at 70% 40%,rgba(255,107,53,.10),transparent 70%);
}
.hero-glow{
  position:absolute;width:900px;height:900px;right:-220px;top:-180px;pointer-events:none;
  background:radial-gradient(circle,rgba(13,150,145,.09),transparent 62%);
  filter:blur(20px);
}
.hero-inner{
  position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;width:100%;
  display:grid;grid-template-columns:minmax(0,1fr) 330px;
  column-gap:clamp(32px,5vw,76px);align-items:start;
}
.hero-copy{min-width:0}
.eyebrow{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;color:var(--muted);
  margin:0 0 28px;display:flex;align-items:center;gap:12px;
}
.eyebrow span{color:var(--accent);border:1px solid rgba(255,107,53,.4);padding:4px 9px;border-radius:4px;font-size:9.5px;letter-spacing:.16em}
h1{
  margin:0;font-size:clamp(38px,6.2vw,86px);line-height:1.04;font-weight:600;
  letter-spacing:-.035em;max-width:15ch;
}
h1 .line{display:block}
h1 .line.sub{font-size:.48em;letter-spacing:-.01em;line-height:1.3;margin-top:.16em}
h1 .accent{
  color:transparent;
  background:linear-gradient(94deg,#ff8a4c,#ff5f2e 40%,#f7c46b);
  -webkit-background-clip:text;background-clip:text;
}
.lede{
  margin:28px 0 0;max-width:46ch;color:var(--muted);font-size:15.5px;line-height:1.8;
}
.hero-actions{display:flex;gap:12px;margin-top:36px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:10px;height:48px;padding:0 22px;border-radius:999px;
  font-size:14px;font-weight:500;transition:transform .2s ease,background .2s,border-color .2s;
}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--accent);color:#150a04;font-weight:600}
.btn-primary:hover{transform:translateY(-2px);background:#ff8555}
.btn-ghost{border:1px solid var(--line-strong);color:var(--muted)}
.btn-ghost:hover{color:var(--txt);border-color:rgba(18,28,40,.28)}
.hero-metrics{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;
  margin:8px 0 0;background:var(--line);border:1px solid var(--line);
  border-radius:2px;
}
.hero-metrics>div{background:rgba(255,255,255,.66);padding:18px 20px 16px}
.hero-metrics dt{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.16em;color:var(--dim);margin-bottom:8px;
}
.hero-metrics dd{
  margin:0;font-size:24px;font-weight:500;letter-spacing:-.02em;font-variant-numeric:tabular-nums;
}
.hero-metrics dd span{display:block;font-family:var(--mono);font-size:10px;color:var(--muted);letter-spacing:.06em;margin-top:3px}
.hero-metrics dd.metric-inline span{display:inline;margin:0 0 0 4px}
.hero-foot{
  position:absolute;left:28px;right:28px;bottom:22px;z-index:2;
  display:flex;justify-content:space-between;align-items:center;
  max-width:var(--maxw);margin:0 auto;
  font-size:11.5px;color:var(--dim);letter-spacing:.04em;
}
.hero-foot .mono{font-size:9.5px;letter-spacing:.14em}
.touch-hint{display:none}
.hero-schematic{display:none}
.sch-line{color:rgba(70,92,114,.55)}
.sch-flow{stroke:var(--accent);stroke-dasharray:22 14;animation:flow 2.8s linear infinite;opacity:.9}
.sch-flow path:last-child{stroke:var(--cyan);stroke-dasharray:4 8;animation-duration:1.6s}
.sch-label{opacity:.6}
.sch-tick{opacity:.6}
@keyframes flow{to{stroke-dashoffset:-72}}

/* ---------- sections ---------- */
.section{
  position:relative;max-width:var(--maxw);margin:0 auto;
  padding:100px 28px;border-bottom:1px solid var(--line);
}
.section-head{
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);
  gap:48px;align-items:end;margin-bottom:44px;
}
.kicker{
  font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--dim);
  margin:0 0 18px;display:flex;align-items:center;gap:12px;
}
.kicker span{
  color:var(--accent);border:1px solid rgba(255,107,53,.35);border-radius:3px;
  padding:3px 7px;font-size:9px;
}
.section-title h2{
  margin:0;font-size:clamp(28px,3.6vw,46px);line-height:1.12;letter-spacing:-.03em;font-weight:600;
}
.section-note{
  margin:0;color:var(--muted);font-size:14.5px;line-height:1.85;max-width:52ch;
  padding-bottom:4px;
}

/* ---------- stage ---------- */
.stage-section{max-width:none;padding-left:0;padding-right:0}
.stage-section .section-head{padding:0 28px;max-width:var(--maxw);margin-left:auto;margin-right:auto}
.viewer-shell{
  display:grid;grid-template-columns:minmax(0,1fr) 356px;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:var(--bg-2);
}
.viewer{
  position:relative;height:min(78vh,760px);min-height:520px;overflow:hidden;
  background:
    radial-gradient(70% 60% at 50% 38%,#f2f4f7 0%,#e9edf1 62%,#e2e6eb 100%);
  cursor:grab;
}
.viewer:active{cursor:grabbing}
#scene{width:100%;height:100%;display:block}
.viewer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(18,28,40,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(18,28,40,.05) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(80% 70% at 50% 48%,#000,transparent 85%);
}
.viewer::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  box-shadow:inset 0 0 120px 40px rgba(24,34,46,.10);
}

/* hud */
.hud{
  position:absolute;z-index:6;font-family:var(--mono);font-size:9.5px;
  letter-spacing:.16em;color:var(--dim);display:flex;align-items:center;gap:8px;
  pointer-events:none;
}
.hud-tl{top:18px;left:20px}
.hud-tr{top:18px;right:20px;color:var(--muted)}
.hud-dot{width:5px;height:5px;border-radius:50%;background:var(--accent)}

/* presets */
.view-presets{
  position:absolute;z-index:6;right:20px;bottom:84px;display:flex;gap:2px;
  background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:8px;
  padding:3px;backdrop-filter:blur(10px);box-shadow:0 6px 18px rgba(24,34,46,.08);
}
.view-presets button{
  font-size:11px;color:var(--muted);padding:5px 11px;border-radius:5px;transition:.18s;
}
.view-presets button:hover{color:var(--txt)}
.view-presets button.active{background:rgba(18,28,40,.07);color:var(--txt)}

/* toolbar */
.toolbar{
  position:absolute;z-index:7;left:20px;right:20px;bottom:18px;
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  padding:8px;border-radius:10px;
  background:rgba(255,255,255,.88);border:1px solid var(--line);
  backdrop-filter:blur(14px);box-shadow:0 8px 24px rgba(24,34,46,.10);
}
.tool{
  display:inline-flex;align-items:center;gap:7px;height:32px;padding:0 11px;border-radius:6px;
  font-size:11.5px;color:var(--muted);border:1px solid transparent;transition:.18s;white-space:nowrap;
}
.tool svg{width:14px;height:14px}
.tool:hover{color:var(--txt);background:rgba(18,28,40,.05)}
.tool.active{color:var(--accent);background:var(--accent-soft);border-color:rgba(255,107,53,.32)}
.range{
  display:flex;align-items:center;gap:9px;margin-left:auto;padding:0 8px;font-size:11px;color:var(--muted);
}
.range input[type=range]{
  -webkit-appearance:none;appearance:none;width:120px;height:3px;border-radius:2px;
  background:linear-gradient(90deg,rgba(232,95,39,.65) var(--fill,0%),rgba(18,28,40,.14) var(--fill,0%));
  outline:none;cursor:pointer;
}
.range input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:13px;height:13px;border-radius:50%;background:var(--accent);
  border:2px solid #fff;box-shadow:0 0 0 1px rgba(232,95,39,.45),0 2px 6px rgba(24,34,46,.18);
}
.range output{font-family:var(--mono);font-size:10px;color:var(--txt);width:34px;text-align:right}

/* hotspots */
.hotspots{position:absolute;inset:0;z-index:5;pointer-events:none}
.hs-lines{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.hs-lines line{stroke:rgba(58,74,92,.42);stroke-width:1;vector-effect:non-scaling-stroke;opacity:0;transition:opacity .3s}
.hs-lines line.ready{opacity:1}
.hs-marker{
  position:absolute;transform:translate(-50%,-50%);width:9px;height:9px;padding:0;
  border-radius:50%;background:#fff;pointer-events:auto;
  box-shadow:0 0 0 1px rgba(18,28,40,.55),0 0 0 5px rgba(255,255,255,.55),0 2px 6px rgba(24,34,46,.12);
  opacity:0;transition:background .2s,box-shadow .2s,transform .2s,opacity .3s;
}
.hs-marker.ready{opacity:1}
.hs-marker:hover,.hs-marker.selected{background:var(--accent);box-shadow:0 0 0 1px rgba(18,28,40,.45),0 0 0 7px rgba(232,95,39,.22);transform:translate(-50%,-50%) scale(1.2)}
.hs-label{
  position:absolute;transform:translate(-50%,-50%);
  display:flex;align-items:center;gap:7px;padding:3px 8px;border-radius:5px;
  background:rgba(255,255,255,.92);border:1px solid rgba(18,28,40,.16);box-shadow:0 2px 10px rgba(24,34,46,.08);
  backdrop-filter:blur(8px);white-space:nowrap;pointer-events:auto;
  opacity:0;transition:opacity .3s,border-color .2s,background .2s;
}
.hs-label.ready{opacity:1}
.hs-label b{font-family:var(--mono);font-size:8.5px;letter-spacing:.06em;color:var(--accent);font-weight:500}
.hs-label .hs-name{display:none;font-size:10.5px;color:#131a24}
.hs-label:hover,.hs-label.selected{border-color:rgba(232,95,39,.55);background:#fff}
.hs-label:hover .hs-name,.hs-label.selected .hs-name,.hs-label.show .hs-name{display:inline}

/* load cover */
.load-cover{
  position:absolute;inset:0;z-index:9;display:grid;place-items:center;
  background:rgba(244,246,248,.92);backdrop-filter:blur(6px);
  transition:opacity .6s ease,visibility .6s;
}
.load-cover.done{opacity:0;visibility:hidden}
.load-box{width:min(340px,80%);text-align:center}
.load-ring{
  width:86px;height:86px;margin:0 auto 22px;border-radius:50%;
  display:grid;place-items:center;position:relative;
  font-family:var(--mono);
}
.load-ring::before{
  content:"";position:absolute;inset:0;border-radius:50%;
  border:1px solid rgba(18,28,40,.12);
}
.load-ring::after{
  content:"";position:absolute;inset:-1px;border-radius:50%;
  border:2px solid transparent;border-top-color:var(--accent);border-right-color:rgba(255,107,53,.3);
  animation:spin 1.4s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.load-ring span{font-size:26px;font-weight:500;color:var(--txt)}
.load-ring i{font-style:normal;font-size:11px;color:var(--muted);align-self:center;margin-top:18px}
.load-title{font-size:13px;color:var(--txt);letter-spacing:.02em}
.load-sub{font-size:9.5px;color:var(--dim);margin:6px 0 16px}
.load-bar{height:2px;background:rgba(18,28,40,.10);border-radius:2px;overflow:hidden}
.load-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),#ffc46b);transition:width .3s}
.load-hint{font-size:10px;color:var(--dim);margin-top:16px}

/* ---------- inspector ---------- */
.inspector{
  display:flex;flex-direction:column;min-height:0;
  background:linear-gradient(180deg,#ffffff,#f6f8fa);
  border-left:1px solid var(--line);
}
.ins-head{padding:22px 24px 16px;border-bottom:1px solid var(--line)}
.ins-head p{font-size:9px;letter-spacing:.18em;color:var(--dim);margin:0 0 6px}
.ins-head h3{font-size:17px;margin:0;font-weight:600;letter-spacing:-.01em}
.ins-body{
  padding:20px 24px;flex:1;overflow-y:auto;min-height:120px;
}
.ins-empty{color:var(--muted);font-size:12.5px;line-height:1.8;margin:0 0 10px}
.ins-empty.hint{color:var(--dim);font-size:11.5px}
.ins-tips{
  margin:18px 0 0;padding:14px 0 0;border-top:1px solid var(--line);list-style:none;
  display:grid;gap:7px;
}
.ins-tips li{
  font-size:11px;color:var(--dim);padding-left:14px;position:relative;line-height:1.6;
}
.ins-tips li::before{
  content:"";position:absolute;left:0;top:7px;width:4px;height:4px;border-radius:50%;
  background:rgba(13,150,145,.6);
}
.ins-part-code{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.14em;color:var(--accent);
  display:inline-flex;align-items:center;gap:8px;margin-bottom:8px;
}
.ins-part-code::after{content:"";height:1px;width:28px;background:rgba(255,107,53,.4)}
.ins-body h4{font-size:20px;margin:0 0 12px;font-weight:600;letter-spacing:-.02em}
.ins-body p{font-size:12.8px;line-height:1.85;color:var(--muted);margin:0 0 14px}
.ins-body ul{margin:0;padding:0;list-style:none;display:grid;gap:7px}
.ins-body li{
  font-size:12px;color:#4c5866;padding-left:15px;position:relative;line-height:1.65;
}
.ins-body li::before{
  content:"";position:absolute;left:0;top:8px;width:5px;height:5px;
  border-radius:50%;background:rgba(13,150,145,.7);
}
.ins-list{border-top:1px solid var(--line);max-height:38%;display:flex;flex-direction:column}
.ins-list-head{
  display:flex;justify-content:space-between;padding:12px 24px 8px;
  font-size:10.5px;color:var(--dim);letter-spacing:.04em;
}
.ins-list ol{
  list-style:none;margin:0;padding:0 12px 12px;overflow-y:auto;
  display:grid;gap:1px;
}
.ins-list li button{
  width:100%;display:flex;align-items:center;gap:10px;padding:7px 12px;border-radius:6px;
  font-size:11.5px;color:var(--muted);text-align:left;transition:.15s;
}
.ins-list li button:hover{background:rgba(18,28,40,.045);color:var(--txt)}
.ins-list li button.active{background:var(--accent-soft);color:#a63d12}
.ins-list code{font-family:var(--mono);font-size:9px;color:var(--dim);width:34px;flex:none}
.ins-list button.active code{color:var(--accent)}
.disclaimer{
  max-width:var(--maxw);margin:0 auto;padding:14px 28px 0;
  font-size:11px;color:var(--dim);
}

/* ---------- 红字提示：无就地控制柜 ---------- */
.ctrl-note{max-width:var(--maxw);margin:8px auto 0;padding:0 28px}
.ctrl-note b{
  display:block;padding:9px 14px;border-left:3px solid #d93025;border-radius:0 6px 6px 0;
  background:#fdecea;color:#c5221f;font-size:12px;font-weight:700;letter-spacing:.4px;
}

/* ---------- principle ---------- */
.principle-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.p-card{
  position:relative;padding:30px 26px 26px;border:1px solid var(--line);border-radius:var(--r);
  background:linear-gradient(160deg,#ffffff,#fbfcfd);
  box-shadow:0 1px 2px rgba(24,34,46,.04);
  transition:border-color .3s,transform .3s;
}
.p-card:hover{border-color:rgba(255,107,53,.32);transform:translateY(-3px)}
.p-step{
  font-family:var(--mono);font-size:9px;letter-spacing:.14em;color:var(--dim);
  display:flex;align-items:center;gap:10px;margin-bottom:26px;
}
.p-step span{
  font-size:22px;color:rgba(255,107,53,.9);letter-spacing:0;font-family:var(--sans);
  border:1px solid rgba(255,107,53,.2);border-radius:6px;width:38px;height:38px;
  display:grid;place-items:center;background:rgba(255,107,53,.05);
}
.p-card h3{margin:0 0 12px;font-size:21px;font-weight:600;letter-spacing:-.02em}
.p-card p{margin:0 0 20px;font-size:13px;line-height:1.85;color:var(--muted)}
.p-card ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;border-top:1px solid var(--line);padding-top:16px}
.p-card li{font-size:11.5px;color:#4f5b69;display:flex;align-items:center;gap:9px}
.p-card li::before{content:"";width:4px;height:4px;background:var(--cyan);border-radius:50%;flex:none}

/* ---------- specs ---------- */
.specs-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:24px;align-items:start}
.spec-tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:0}
.spec-tab{
  padding:11px 20px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  color:var(--dim);border-bottom:2px solid transparent;transition:.2s;
}
.spec-tab:hover{color:var(--muted)}
.spec-tab.active{color:var(--txt);border-bottom-color:var(--accent)}
.spec-table-wrap{border:1px solid var(--line);border-top:none;border-radius:0 0 var(--r) var(--r);overflow:hidden}
.spec-table{width:100%;border-collapse:collapse;font-size:12.8px}
.spec-table caption{
  caption-side:top;text-align:left;padding:18px 20px;font-size:12px;color:var(--muted);
  background:rgba(18,28,40,.025);border-bottom:1px solid var(--line);
}
.spec-table th,.spec-table td{padding:13px 20px;text-align:left;border-bottom:1px solid rgba(18,28,40,.07)}
.spec-table thead th{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--dim);
  font-weight:400;background:rgba(18,28,40,.02);
}
.spec-table tbody tr:last-child td{border-bottom:none}
.spec-table tbody tr{transition:background .18s}
.spec-table tbody tr:hover{background:rgba(255,107,53,.045)}
.spec-table td:first-child{color:var(--muted);width:31%}
.spec-table td:nth-child(2){font-family:var(--mono);font-size:12.5px;color:var(--txt);width:27%;letter-spacing:.01em}
.spec-table td:last-child{color:var(--dim);font-size:11.5px}
.specs-side{
  border:1px solid var(--line);border-radius:var(--r);padding:0;overflow:hidden;
  background:linear-gradient(180deg,#ffffff,#f4f6f9);
}
.selected-model{
  padding:20px 22px;border-bottom:1px solid var(--line);
  background:linear-gradient(135deg,rgba(255,107,53,.12),transparent 70%);
}
.selected-model .mono{font-size:9px;letter-spacing:.16em;color:var(--dim)}
.selected-model strong{display:block;font-size:30px;font-weight:600;letter-spacing:-.03em;margin:4px 0 2px}
.selected-model em{font-family:var(--mono);font-style:normal;font-size:10px;color:var(--accent)}
.side-block{padding:18px 22px;border-bottom:1px solid var(--line)}
.side-block h4{margin:0 0 8px;font-size:12.5px;font-weight:600;color:#1a2430}
.side-block p{margin:0;font-size:11.5px;line-height:1.8;color:var(--muted)}
.side-block ul{margin:0;padding:0;list-style:none;display:grid;gap:8px}
.side-block li{font-size:11.5px;line-height:1.7;color:var(--muted);padding-left:13px;position:relative}
.side-block li::before{content:"";position:absolute;left:0;top:7px;width:4px;height:4px;border-radius:50%;background:rgba(255,107,53,.7)}
.side-note{padding:16px 22px;font-size:10.5px;line-height:1.7;color:var(--dim)}

/* ---------- process / flow ---------- */
.flow{border:1px solid var(--line);border-radius:var(--r);padding:34px 28px 26px;background:linear-gradient(180deg,#ffffff,#fafbfd)}
.flow-svg-wrap{overflow-x:auto;padding-bottom:4px;scrollbar-width:thin}
.flow-svg{display:block;width:100%;min-width:980px;height:auto}
.flow-svg text{font-family:var(--sans)}
.flow-svg .f-txt{fill:#131a24;font-weight:500}
.flow-svg .f-dim{fill:#8b97a5}
.flow-svg .f-no{font-family:var(--mono);font-weight:500}
@keyframes flowDash{to{stroke-dashoffset:-28}}
.anim-flow{stroke-dasharray:7 7;animation:flowDash 1.3s linear infinite}
.flow-legend{display:flex;flex-wrap:wrap;gap:18px;margin:26px 0 0;padding-top:20px;border-top:1px solid var(--line)}
.flow-legend span{display:flex;align-items:center;gap:7px;font-size:10.5px;color:var(--dim)}
.lg{width:8px;height:8px;border-radius:2px;display:block;background:var(--dim)}
.lg.hot{background:#e85f27} .lg.water{background:#2f7fd6} .lg.body{background:#0d9691}
.lg.warn{background:#d64541} .lg.ok{background:var(--ok)}
.lg.signal{width:16px;height:0;border-radius:0;background:none;border-top:2px dashed #e85f27}
.flow-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
.flow-notes>div{border-left:2px solid var(--line-strong);padding:2px 0 2px 14px}
.flow-notes b{display:block;font-size:11.5px;font-weight:500;color:#2a3542}
.flow-notes span{font-size:10.5px;color:var(--dim);line-height:1.6}

/* ---------- contact ---------- */
.contact-card{
  display:grid;grid-template-columns:1.35fr .85fr;gap:36px;align-items:center;
  padding:38px 42px;background:var(--panel);border:1px solid var(--line);
  border-radius:var(--r);box-shadow:0 16px 36px rgba(18,28,40,.05);
}
.contact-org{margin:0;font-size:20px;font-weight:600;letter-spacing:-.01em}
.contact-desc{margin:10px 0 22px;max-width:46ch;font-size:13.5px;line-height:1.8;color:var(--muted)}
.contact-call{width:max-content}
.contact-list{display:grid;margin:0;padding-left:34px;border-left:1px solid var(--line)}
.contact-list>div{display:flex;justify-content:space-between;align-items:baseline;gap:16px;padding:12px 0;border-bottom:1px solid var(--line)}
.contact-list>div:last-child{border-bottom:0}
.contact-list dt{font-size:11.5px;color:var(--dim)}
.contact-list dd{margin:0;font-size:13.5px;color:var(--txt)}
.contact-list dd a{color:var(--accent);font-weight:600;text-decoration:none}
.contact-list dd a:hover{text-decoration:underline}
.footer-meta b a{color:var(--muted);text-decoration:none}
.footer-meta b a:hover{color:var(--accent)}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding:56px 28px 28px;background:var(--bg-2)}
.footer-inner{
  max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:1.4fr 1fr;gap:40px;
}
.footer-brand b{font-size:16px;font-weight:600;letter-spacing:-.01em}
.footer-brand p{margin:12px 0 0;max-width:48ch;font-size:12px;line-height:1.8;color:var(--dim)}
.footer-contact{margin-top:14px !important;color:var(--muted) !important}
.footer-contact a{color:var(--accent);text-decoration:none}
.footer-meta{display:grid;gap:10px;align-content:start}
.footer-meta>div{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:9px}
.footer-meta span{font-size:10.5px;color:var(--dim)}
.footer-meta b{font-family:var(--mono);font-weight:400;font-size:10.5px;color:var(--muted)}
.footer-line{
  max-width:var(--maxw);margin:44px auto 0;padding-top:18px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;font-size:10.5px;color:var(--dim);
}
.footer-line .mono{font-size:9px;letter-spacing:.14em}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .hero-schematic{opacity:.35;right:-8%;width:52vw}
  .nav{
    position:fixed;top:64px;left:0;right:0;z-index:40;
    display:flex;flex-direction:column;gap:2px;margin:0;padding:10px 16px 18px;
    background:#fafbfd;border-bottom:1px solid var(--line);
    box-shadow:0 18px 32px rgba(18,28,40,.08);
    opacity:0;transform:translateY(-10px);pointer-events:none;
    transition:opacity .22s ease,transform .22s ease;
  }
  .nav.open{opacity:1;transform:none;pointer-events:auto}
  .nav a{padding:12px 14px;border-radius:8px;font-size:14px}
  .nav-toggle{display:flex}
  /* 1180px 仍保两栏，仅缩窄右侧栏以适配平板横屏 */
  .viewer-shell{grid-template-columns:minmax(0,1fr) 320px}
  .specs-layout{grid-template-columns:minmax(0,1fr) 300px}
}
@media (max-width:900px){
  /* 平板竖屏及以下才拆栏 */
  .viewer-shell{grid-template-columns:1fr}
  .inspector{border-left:none;border-top:1px solid var(--line);max-height:none;display:grid;grid-template-rows:auto auto}
  .ins-body{max-height:240px}
  .ins-list{max-height:220px}
  .specs-layout{grid-template-columns:1fr}
}
@media (max-width:860px){
  .hero{padding-top:118px;min-height:auto;padding-bottom:80px}
  .hero-inner{grid-template-columns:1fr}
  .hero-metrics{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:40px}
  .hero-schematic{display:none}
  .section{padding:72px 20px}
  .section-head{grid-template-columns:1fr;gap:18px}
  .stage-section .section-head{padding:0 20px}
  .viewer{height:62vh;min-height:420px}
  .toolbar{left:10px;right:10px;bottom:10px;gap:4px}
  .range{order:5;width:100%;margin:4px 0 0;justify-content:space-between}
  .range input[type=range]{flex:1;width:auto}
  .view-presets{bottom:118px;right:12px}
  .principle-grid{grid-template-columns:1fr}
  .flow-notes{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
  .footer-line{flex-direction:column;gap:6px}
  .hero-foot{position:static;margin-top:48px;padding:0 20px;flex-wrap:wrap;gap:8px}
  .mouse-hint{display:none}
  .touch-hint{display:inline}
  .hs-label .hs-name{display:none!important}
  .hs-label{font-size:9.5px;padding:2px 6px}
  .spec-table{font-size:12px}
  .spec-table th,.spec-table td{padding:11px 12px}
  .spec-table td:first-child{width:28%}
  .spec-table td:nth-child(2){width:36%;font-size:11.5px}
  .spec-table td:last-child{font-size:10.5px}
  .spec-tabs{overflow-x:auto;scrollbar-width:none}
  .spec-tab{padding:11px 14px}
  .contact-card{grid-template-columns:1fr;gap:24px;padding:28px 24px}
  .contact-list{padding-left:0;padding-top:6px;border-left:0;border-top:1px solid var(--line)}
}
@media (max-width:520px){
  .topbar-inner{padding:0 16px;gap:12px}
  .brand-text i{display:none}
  .topbar-tag{padding-left:12px;font-size:8.5px}
  .hero{padding-left:20px;padding-right:20px}
  h1{font-size:clamp(30px,9vw,42px)}
  .hero-metrics dd{font-size:19px}
  .hero-foot{flex-direction:column;align-items:flex-start;gap:6px}
  .ins-head,.ins-body{padding-left:18px;padding-right:18px}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto}
}