:root{--bg: #f4f6f9;--panel: rgba(255, 255, 255, .93);--line: #d4dbe4;--text: #141b28;--muted: #5b6575;--accent: #b45309;--accent-soft: #fde8cd}*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,sans-serif}#scene-container{position:fixed;top:0;right:0;bottom:0;left:0}#scene-container canvas{display:block}#labels-layer{position:fixed;top:0;right:0;bottom:0;left:0;overflow:hidden;pointer-events:none}.part-label{position:absolute;top:0;left:0;transform:translate(-50%,-130%);white-space:nowrap;font-size:12px;font-weight:600;color:var(--text);background:#ffffffeb;border:1px solid var(--line);border-radius:999px;padding:3px 10px;opacity:0}.part-label.selected{color:#fff;background:var(--accent);border-color:var(--accent)}.part-label.active{border-color:var(--accent);border-width:2px;box-shadow:0 1px 6px #b4530959}#chapter-overlay{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;display:flex;justify-content:space-between;align-items:flex-end;padding:110px 48px 120px;gap:32px}.ch-left{max-width:460px}.ch-kicker{margin:0 0 10px;font-size:13px;font-weight:800;letter-spacing:.14em;color:var(--accent)}.ch-title{margin:0 0 14px;font-size:clamp(34px,4.6vw,58px);font-weight:750;letter-spacing:-.015em;line-height:1.02}.ch-desc{margin:0 0 10px;font-size:16px;line-height:1.5;color:#333d4e}.ch-func{margin:0;font-size:14px;line-height:1.5;color:var(--muted)}.ch-func span{font-weight:700;color:var(--text)}.ch-right{width:340px;flex-shrink:0}.spec-card{pointer-events:auto;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px;box-shadow:0 8px 28px #141b281a;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);max-height:calc(100vh - 260px);overflow-y:auto}.spec-row{display:flex;flex-direction:column;gap:2px;margin:0;padding:7px 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380px)}}@media(max-width:900px),(pointer:coarse){#scene-container{top:calc(208px + env(safe-area-inset-top));bottom:calc(38vh + 96px + env(safe-area-inset-bottom));bottom:calc(38dvh + 96px + env(safe-area-inset-bottom))}#hud-toolbar,body.ed-open #hud-toolbar{top:calc(96px + env(safe-area-inset-top));left:8px;right:8px;max-width:none;transform:none;display:grid;grid-template-columns:44px 44px minmax(56px,1fr) 44px 44px;gap:4px;padding:6px}#hud-title{top:calc(8px + env(safe-area-inset-top));left:8px;right:8px;max-width:none}#hud-title h1{font-size:13px}.institutional-brand{margin-bottom:6px;gap:8px}.institutional-logos img{width:30px;height:30px}.institutional-copy strong{font-size:12px}.institutional-copy span{font-size:10px}#site-credit{right:calc(8px + env(safe-area-inset-right));font-size:10px}.demo-badge{font-size:9.5px;padding:2px 6px;white-space:normal}#hud-hint,#assembly-hint,#scroll-progress{display:none}#chapter-indicator{grid-row:1;grid-column:1 / 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12px;-webkit-backdrop-filter:none;backdrop-filter:none;box-shadow:none}.sub-list{max-height:none;overflow:visible}.spec-details summary{min-height:44px;display:flex;align-items:center}.ev-legend{white-space:normal}.part-label{font-size:10px;padding:2px 6px}#assembly-card{bottom:calc(32px + env(safe-area-inset-bottom));left:8px;right:8px;width:auto;max-width:none;transform:none;flex-wrap:nowrap;gap:6px;padding:6px;min-height:56px}#assembly-card button{min-height:44px;padding:6px 8px;font-size:12px}#assembly-slider{flex:1;gap:0}.ab-label{display:none}#assembly-range{min-height:44px;margin:0}.ed-panel{padding-bottom:calc(16px + env(safe-area-inset-bottom))}.ed-head button,.ed-bar button{min-height:44px}}@media(max-width:900px)and (orientation:landscape)and (max-height:600px),(pointer:coarse)and (orientation:landscape)and (max-height:600px){#hud-title{display:flex;align-items:center;justify-content:space-between;gap:8px}.institutional-brand{margin:0;gap:6px}.institutional-logos img{width:26px;height:26px}.institutional-copy strong{font-size:11px}.institutional-copy span{font-size:9px}#hud-title h1{margin:0;font-size:11px;max-width:190px;text-align:right}#hud-title .demo-badge{display:none}#hud-toolbar,body.ed-open #hud-toolbar{top:calc(48px + env(safe-area-inset-top));display:flex;flex-wrap:nowrap;justify-content:space-between}#chapter-indicator{flex:1;order:0;min-width:44px}#chapter-name{max-width:80px}#hud-toolbar button{min-width:44px;flex:none}#hud-toolbar #btn-reset-cam{flex:none;font-size:0;min-width:56px}#btn-reset-cam:after{content:"Vista";font-size:12px}#btn-fullscreen{order:4}#btn-edit{order:5}#motion-mode{width:86px;flex-shrink:0;order:6}#scene-container{top:calc(112px + env(safe-area-inset-top));right:48%;bottom:calc(84px + env(safe-area-inset-bottom))}#chapter-overlay{top:calc(112px + env(safe-area-inset-top));left:52%;bottom:calc(84px + env(safe-area-inset-bottom));height:auto;padding:10px;border-radius:12px 0 0 12px}.ch-title{font-size:19px}#assembly-card{bottom:calc(32px + env(safe-area-inset-bottom))}}.asset-warning{padding:10px;border:1px solid #b86734;border-radius:8px;background:#fff4e9;color:#773e1f;font-size:12px;line-height:1.5}.ev-estimate{margin:.35rem 0;line-height:1.45;font-size:.85em}.pdf-evidence{margin-top:12px;border-top:1px solid var(--line);padding-top:12px}.proof-heading{margin:0;font-size:15px;font-weight:800}.proof-piece{padding:12px 0;border-top:1px solid var(--line)}.proof-piece:first-child{border-top:0}.proof-piece h3{margin:0 0 5px;font-size:14px}.proof-counts{margin:0 0 8px;font-size:11px;line-height:1.5}.pdf-links{display:grid;gap:6px;margin:8px 0;min-width:0}.pdf-link{display:flex;align-items:flex-start;gap:8px;min-height:44px;border:1px solid #d6e2e9;border-radius:9px;background:#f6fafc;padding:9px;text-decoration:none;color:#214b63;line-height:1.4}.pdf-link>span:last-child{min-width:0;overflow-wrap:anywhere}.pdf-link 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