*{margin:0;padding:0;box-sizing:border-box}
:root{
  --max:1100px;
  --accent:#2563eb;
  --accent2:#0891b2;
  --good:#059669;
  --bad:#dc2626;
  --bg:#fff;
  --text:#1e293b;
  --text2:#64748b;
  --border:#e2e8f0;
  --e1:#64748b;
  --e3:#2563eb;
}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* Hero */
.hero{padding:72px 24px 48px;text-align:center;background:linear-gradient(180deg,#f8fafc 0%,#fff 100%);border-bottom:1px solid var(--border)}
.hero h1{font-size:clamp(26px,4vw,40px);font-weight:800;letter-spacing:-0.03em;line-height:1.2;max-width:var(--max);margin:0 auto 14px}
.hero h1 span{background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero .subtitle{font-size:17px;color:var(--text2);max-width:680px;margin:18px auto 0;line-height:1.6}
.authors{font-size:14px;color:var(--text2);margin-bottom:6px}
.authors b{color:var(--text);font-weight:600}
.affiliations{font-size:12px;color:var(--text2);margin-bottom:20px}
.venue{font-size:14px;color:var(--text2);margin-bottom:20px}
.btn-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:8px;font-size:14px;font-weight:600;border:1px solid var(--border);transition:all .15s;cursor:pointer;text-decoration:none!important;color:var(--text)}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{background:#1d4ed8}
.btn:hover{border-color:var(--accent);color:var(--accent)}

/* KPIs */
.kpi-row{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  max-width:var(--max);margin:0 auto;
  border-bottom:1px solid var(--border);
}
.kpi{padding:28px 20px;text-align:center;border-right:1px solid var(--border)}
.kpi:last-child{border-right:none}
.kpi-value{font-size:28px;font-weight:800;letter-spacing:-0.02em;color:var(--text)}
.kpi-highlight .kpi-value{color:var(--good)}
.kpi-label{font-size:12px;color:var(--text2);margin-top:4px;line-height:1.4}
@media(max-width:760px){
  .kpi-row{grid-template-columns:repeat(2,1fr)}
  .kpi{border-bottom:1px solid var(--border)}
  .kpi:nth-child(2){border-right:none}
}

/* Sections */
.section{padding:56px 24px;max-width:var(--max);margin:0 auto}
.section-alt{background:#f8fafc;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.section-alt-dark{background:#0f172a;color:#e2e8f0;padding:56px 24px;border-top:none;border-bottom:none}
.section-alt-dark h2{color:#fff}
.section-alt-dark .lead{color:#94a3b8}
.section h2{font-size:26px;font-weight:700;letter-spacing:-0.02em;margin-bottom:8px}
.section .lead{font-size:15px;color:var(--text2);margin-bottom:28px;max-width:720px}
.section h3{font-size:17px;font-weight:700;margin-bottom:10px;margin-top:28px}

/* Demo section */
.demo-section{background:#0f172a;border-top:1px solid #0f172a;border-bottom:1px solid #0f172a}
.demo-section .section{max-width:1200px;padding:56px 24px}
.demo-section h2{color:#fff}
.demo-section .lead{color:#94a3b8}

.viewer-controls{display:flex;gap:24px;flex-wrap:wrap;margin-bottom:20px}
.control-group{display:flex;flex-direction:column;gap:6px}
.control-group label{font-size:11px;text-transform:uppercase;letter-spacing:0.05em;color:#94a3b8;font-weight:600}
.seg-btns{display:inline-flex;border:1px solid #334155;border-radius:8px;overflow:hidden;background:#1e293b}
.seg-btns button{padding:8px 16px;background:transparent;border:none;color:#94a3b8;font-size:13px;font-weight:500;cursor:pointer;font-family:inherit;transition:all .15s}
.seg-btns button:hover{color:#e2e8f0}
.seg-btns button.active{background:var(--accent);color:#fff}
.seg-btns button:not(:last-child){border-right:1px solid #334155}

.viewer-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;position:relative}
@media(max-width:860px){.viewer-grid{grid-template-columns:1fr}}
.viewer-panel{background:#1e293b;border:1px solid #334155;border-radius:12px;overflow:hidden}
.viewer-title{padding:12px 16px;color:#e2e8f0;font-size:14px;font-weight:600;border-bottom:1px solid #334155;display:flex;align-items:center;gap:10px}
.tag-e1,.tag-e3{font-size:11px;padding:2px 8px;border-radius:4px;font-weight:500;color:#fff}
.tag-e1{background:var(--e1)}
.tag-e3{background:var(--e3)}
.viewer-canvas{width:100%;height:420px;background:#0f172a;position:relative}
.viewer-canvas.loading::after{content:"Loading VTK.js…";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#64748b;font-size:13px}
.viewer-stats{padding:10px 16px;color:#94a3b8;font-size:12px;border-top:1px solid #334155;font-family:ui-monospace,Menlo,monospace}

.colorbar{margin-top:20px;position:relative}
.colorbar .cb-bar{height:22px;border-radius:5px;border:1px solid #1e293b}
.colorbar .cb-ticks{position:relative;height:18px;margin-top:4px}
.colorbar .cb-ticks span{position:absolute;transform:translateX(-50%);font-size:11px;color:#94a3b8;font-family:ui-monospace,Menlo,monospace;white-space:nowrap}
.colorbar .cb-ticks span::before{content:"";position:absolute;left:50%;top:-6px;width:1px;height:5px;background:#475569}
.colorbar .cb-label{margin-top:6px;text-align:center;font-size:12px;color:#94a3b8;letter-spacing:0.02em}

/* Slices */
.slice-controls{display:flex;gap:24px;flex-wrap:wrap;margin-bottom:24px;align-items:flex-end}
.slider-wrap{width:280px}
.slider-wrap input[type=range]{width:100%;accent-color:var(--accent)}
.slider-ticks{display:flex;justify-content:space-between;font-size:11px;color:#64748b;margin-top:2px}
.slice-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;position:relative}
@media(max-width:1000px){.slice-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.slice-grid{grid-template-columns:1fr}}
.slice-panel{background:#1e293b;border:1px solid #334155;border-radius:10px;padding:12px;text-align:center}
.slice-title{color:#e2e8f0;font-size:13px;font-weight:600;margin-bottom:8px}
.slice-sub{color:#94a3b8;font-size:12px;margin:8px 0 4px}
.slice-panel img{max-width:100%;border-radius:6px;background:#0f172a;min-height:120px}
.slice-panel-diff{border-color:#2563eb}
.slice-diff-legend{display:flex;justify-content:space-between;font-size:11px;color:#94a3b8;margin-top:6px;padding:0 4px}
.slice-diff-legend .e1-win{color:#3b82f6}
.slice-diff-legend .e3-win{color:#ef4444}
#slice-colorbars{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px}
@media(max-width:760px){#slice-colorbars{grid-template-columns:1fr}}
.slice-cb .cb-bar{height:18px;border-radius:4px;border:1px solid #1e293b}
.slice-cb .cb-ticks{position:relative;height:16px;margin-top:4px}
.slice-cb .cb-ticks span{position:absolute;transform:translateX(-50%);font-size:10px;color:#94a3b8;font-family:ui-monospace,Menlo,monospace;white-space:nowrap}
.slice-cb .cb-ticks span::before{content:"";position:absolute;left:50%;top:-5px;width:1px;height:4px;background:#475569}
.slice-cb .cb-label{margin-top:4px;text-align:center;font-size:11px;color:#94a3b8}

/* Side-view position indicator */
.side-view{margin:20px 0 28px;padding:14px 16px;background:#0b1220;border:1px solid #1e293b;border-radius:10px}
.side-view-label{color:#e2e8f0;font-size:13px;font-weight:600;margin-bottom:8px;font-family:ui-monospace,Menlo,monospace}
.side-view-box{position:relative;width:100%;max-width:640px;margin:0 auto;border-radius:6px;overflow:hidden;background:#0f172a}
.side-view-box img{display:block;width:100%;height:auto}
#side-marker{position:absolute;top:0;height:100%;width:2px;background:#f97316;box-shadow:0 0 8px rgba(249,115,22,0.7);pointer-events:none;transition:left .15s ease}
.side-view-caption{color:#64748b;font-size:11px;text-align:center;margin-top:8px}

/* Contributions */
.contrib-list{display:flex;flex-direction:column;gap:14px}
.contrib{display:flex;gap:14px;padding:18px 20px;border:1px solid var(--border);border-radius:10px;background:#fff}
.contrib-icon{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0;margin-top:2px}
.contrib h4{font-size:14px;font-weight:700;margin-bottom:3px}
.contrib p{font-size:13px;color:var(--text2);line-height:1.5;margin:0}
.contrib b{color:var(--accent)}

/* Table */
.comp-table{width:100%;border-collapse:collapse;margin:14px 0 8px;font-size:14px}
.comp-table th{text-align:left;padding:8px 14px;border-bottom:2px solid var(--border);font-size:12px;color:var(--text2);font-weight:600;text-transform:uppercase;letter-spacing:.05em}
.comp-table td{padding:10px 14px;border-bottom:1px solid var(--border)}
.comp-table tr.highlight{background:#eff6ff}
.comp-table tr.highlight td{color:var(--accent);font-weight:600}
.delta-good{color:var(--good);font-weight:600;font-size:12px;margin-left:4px}
.delta-bad{color:var(--bad);font-weight:600;font-size:12px;margin-left:4px}

/* Paper fig */
.paper-fig{margin:24px 0;text-align:center}
.paper-fig img{max-width:100%;height:auto;border-radius:6px;border:1px solid var(--border);background:#fff}
.paper-fig figcaption{font-size:12px;color:var(--text2);margin-top:8px;line-height:1.5;max-width:720px;margin-left:auto;margin-right:auto;text-align:left}

footer{padding:32px 24px;text-align:center;border-top:1px solid var(--border);font-size:12px;color:var(--text2)}

/* Fake "running inference" overlay */
.inference-overlay{
  position:absolute;inset:0;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  background:rgba(15,23,42,0.86);backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);
  border-radius:12px;
  color:#e2e8f0;font-size:13px;letter-spacing:0.02em;
  z-index:10;
  opacity:0;pointer-events:none;transition:opacity .18s ease;
}
.inference-overlay.visible{opacity:1;pointer-events:auto}
.inference-spinner{
  width:38px;height:38px;border-radius:50%;
  border:3px solid #334155;border-top-color:#2563eb;border-right-color:#0891b2;
  animation:inf-spin 0.85s linear infinite;
}
@keyframes inf-spin{to{transform:rotate(360deg)}}
.inference-label{font-family:ui-monospace,Menlo,monospace;font-size:13px;color:#e2e8f0}
.inference-label .dots::after{content:"";display:inline-block;width:1.4em;text-align:left;animation:inf-dots 1.2s steps(4,end) infinite}
@keyframes inf-dots{
  0%,100%{content:""}
  25%{content:"."}
  50%{content:".."}
  75%{content:"..."}
}
.inference-progress{
  width:200px;height:4px;background:#1e293b;border:1px solid #334155;border-radius:3px;overflow:hidden;
}
.inference-progress-bar{
  height:100%;background:linear-gradient(90deg,#2563eb,#0891b2);
  width:0%;transition:width .08s linear;
}
.inference-eta{font-family:ui-monospace,Menlo,monospace;font-size:11px;color:#94a3b8}

@media(max-width:640px){
  .hero{padding:48px 16px 32px}
  .hero h1{font-size:24px}
  .section{padding:36px 16px}
  .demo-section .section{padding:32px 16px}
  .viewer-canvas{height:320px}
}