:root{--blue:#2457d6;--text:#1d2433;--muted:#687083;--line:#dfe4ec;--page:#fff;--soft:#f5f7fa;--max:1010px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);background:var(--page);font-family:Arial,Helvetica,sans-serif;line-height:1.55}.topbar{border-bottom:1px solid var(--line);background:#fff}.topbar-inner{width:min(var(--max),calc(100% - 48px));height:58px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.wordmark{color:var(--text);font-size:17px;font-weight:700;text-decoration:none;letter-spacing:-.02em}.topbar-label{color:var(--muted);font-size:12px}.page{width:min(var(--max),calc(100% - 48px));margin:0 auto}.hero{text-align:center;padding:58px 0 48px;border-bottom:1px solid var(--line)}.venue{margin:0 0 22px;color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}h1{max-width:860px;margin:0 auto 28px;font-size:clamp(32px,5vw,52px);line-height:1.12;letter-spacing:-.04em;font-weight:700}.authors{max-width:880px;margin:0 auto 14px;display:flex;justify-content:center;flex-wrap:wrap;column-gap:18px;row-gap:5px;font-size:15px}sup{font-size:.66em;line-height:0}.affiliations,.author-notes{margin:0;color:var(--muted);font-size:13px}.author-notes{margin-top:7px;font-size:12px}.resource-links{margin-top:31px;display:flex;justify-content:center;flex-wrap:wrap;gap:10px}.resource-link{display:inline-block;padding:10px 17px;border:1px solid var(--blue);border-radius:4px;color:var(--blue);background:#fff;font-size:13px;font-weight:700;text-decoration:none;transition:background .18s,color .18s}.resource-link:hover{color:#fff;background:var(--blue)}.resource-link span{font-weight:400;font-size:12px}section{padding:40px 0;border-bottom:1px solid var(--line)}h2{margin:0;font-size:30px;line-height:1.2;letter-spacing:-.03em}.media-section h2{margin-bottom:20px}.section-heading{display:flex;gap:22px;align-items:flex-start;margin-bottom:20px}.section-heading h2{margin-bottom:7px}.section-heading p:not(.section-number){margin:0;color:var(--muted);font-size:14px}.section-number{margin:2px 0 0;color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.08em}.video-placeholder,.demo-placeholder{min-height:430px;background:var(--soft);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:14px}.video-placeholder{aspect-ratio:16/9;min-height:0}.video-placeholder span,.demo-placeholder span{border:1px solid #cbd2de;background:#fff;padding:10px 15px;border-radius:3px}.paper-figure{margin:0 0 32px}.paper-figure:last-child{margin-bottom:0}.paper-figure img{display:block;width:100%;height:auto;border:1px solid var(--line);background:#fff}.paper-figure figcaption{margin-top:13px;color:var(--muted);font-size:13px;line-height:1.6}.paper-figure figcaption strong{color:var(--text)}.narrow-figure img{max-width:900px;margin:0 auto}.demo-section{padding-bottom:46px}.demo-controls{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}.scene-button{border:1px solid #b7c1d1;border-radius:4px;background:#fff;color:var(--text);padding:9px 13px;font:inherit;font-size:12px;cursor:pointer}.scene-button:hover,.scene-button.is-active{border-color:var(--blue);background:#eef3ff;color:var(--blue)}.viewer-frame{position:relative;border:1px solid var(--line);background:linear-gradient(#f7f9fc,#eef2f7);min-height:500px}.viewer-frame model-viewer{width:100%;height:500px;--poster-color:transparent}.viewer-status{position:absolute;bottom:14px;left:14px;padding:7px 10px;border:1px solid var(--line);border-radius:3px;background:rgba(255,255,255,.92);color:var(--muted);font-size:11px;pointer-events:none}.local-note{margin:11px 0 0;color:var(--muted);font-size:12px}.footer{width:min(var(--max),calc(100% - 48px));margin:0 auto;padding:22px 0 28px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:11px}@media(max-width:620px){.topbar-inner,.page,.footer{width:calc(100% - 32px)}.hero{padding:44px 0 38px}.authors{font-size:14px;column-gap:12px}.affiliations{line-height:1.8}.author-notes{line-height:1.7}.resource-links{gap:8px}.resource-link{padding:9px 12px}.section-heading{gap:14px}.section-heading h2{font-size:26px}.video-placeholder{aspect-ratio:4/3}.viewer-frame,.viewer-frame model-viewer{min-height:330px;height:330px}.footer{flex-direction:column}}
.video-frame{width:100%;margin:0 auto;position:relative;border:1px solid var(--line);background:#111;aspect-ratio:16/9;overflow:hidden}.video-frame video{display:block;width:100%;height:100%;object-fit:contain}.main-video-status{position:absolute;left:14px;top:14px;padding:7px 10px;border:1px solid var(--line);border-radius:3px;background:rgba(255,255,255,.92);color:var(--muted);font-size:11px;pointer-events:none}
.demo-input-row{display:flex;align-items:center;gap:10px;margin:0 0 10px;color:var(--muted);font-size:12px}.demo-input-row img{width:76px;height:58px;border:1px solid var(--line);border-radius:4px;object-fit:cover}.preview-note{margin:0 0 12px;color:var(--muted);font-size:12px}
.demo-strip-wrap{position:relative;margin:0 0 22px;border:1px solid var(--line);background:var(--soft);padding:12px}.demo-strip{display:flex;gap:12px;overflow-x:auto;padding:2px 2px 9px;scroll-snap-type:x proximity}.demo-thumb{flex:0 0 128px;display:flex;flex-direction:column;gap:7px;padding:7px;border:1px solid #cbd2de;border-radius:6px;background:#fff;color:var(--text);font:inherit;font-size:11px;text-align:left;cursor:pointer;scroll-snap-align:start}.demo-thumb:hover,.demo-thumb.is-active{border-color:var(--blue);box-shadow:0 0 0 2px #dce6ff;color:var(--blue)}.demo-thumb img{display:block;width:114px;height:82px;object-fit:cover;border-radius:3px;background:#eef1f4}.demo-selection{border-top:1px solid var(--line);padding-top:20px}.demo-selected-input{display:flex;align-items:center;gap:14px;margin-bottom:9px}.demo-selected-input img{width:170px;height:106px;object-fit:cover;border:1px solid var(--line);border-radius:5px;background:#eef1f4}.demo-selected-input strong{display:block;font-size:17px}.demo-selected-input span{display:block;margin-top:4px;color:var(--muted);font-size:12px}

/* Interactive demo: compact vertical picker beside a readable selected image. */
.demo-toggle{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}.scene-button:disabled{opacity:.45;cursor:default}.demo-upper-row{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:20px;align-items:stretch}
.section-heading .demo-note{margin-top:6px}
.demo-strip-wrap{height:360px;margin:0;border:1px solid var(--line);background:var(--soft);padding:12px;overflow:hidden}
.demo-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;max-height:334px;overflow-y:auto;overflow-x:hidden;padding:2px 4px 9px 2px}
.demo-thumb{min-width:0;display:block;padding:6px;border:1px solid #cbd2de;border-radius:6px;background:#fff;cursor:pointer}
.demo-thumb img{display:block;width:100%;height:92px;object-fit:cover;border-radius:3px;background:#eef1f4}
.demo-thumb span{display:none}
.demo-thumb:hover,.demo-thumb.is-active{border-color:var(--blue);box-shadow:0 0 0 2px #dce6ff}
.selected-input-panel{display:flex;align-items:center;justify-content:center;width:100%;height:360px;padding:14px;border:1px solid var(--line);border-radius:6px;background:var(--soft);cursor:zoom-in}
.selected-input-panel img{display:block;width:100%;height:100%;object-fit:contain;background:#eef1f4}
.demo-selection{border-top:0;padding-top:14px}
.image-lightbox{position:fixed;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;padding:28px;background:rgba(15,22,36,.82)}
.image-lightbox[hidden]{display:none}
.image-lightbox img{max-width:min(94vw,1200px);max-height:90vh;object-fit:contain;background:#fff;border-radius:4px;box-shadow:0 20px 60px rgba(0,0,0,.35)}
.lightbox-close{position:absolute;top:16px;right:22px;width:40px;height:40px;border:0;border-radius:50%;background:#fff;color:var(--text);font-size:28px;line-height:1;cursor:pointer}
body.lightbox-open{overflow:hidden}
@media(max-width:620px){.demo-upper-row{grid-template-columns:1fr}.demo-strip-wrap{height:250px}.demo-strip{max-height:224px}.selected-input-panel{height:270px}.demo-thumb img{height:78px}}

.figure-title{margin:0 0 16px;font-size:clamp(18px,2.5vw,22px);line-height:1.4;font-weight:600;letter-spacing:-.02em}

.rendered-video-frame{width:100%;margin:14px auto 0;position:relative;border:1px solid var(--line);background:#111;aspect-ratio:16/9;overflow:hidden}.rendered-video-frame video{display:block;width:min(100%,600px);height:100%;margin:0 auto;object-fit:contain}.rendered-video-status{position:absolute;line-height:1.5;left:14px;top:14px;padding:7px 10px;border:1px solid var(--line);border-radius:3px;background:rgba(255,255,255,.92);color:var(--muted);font-size:11px;pointer-events:none}.rendered-video-dimensions{display:inline-block;margin-top:2px;color:var(--text);font-weight:600}.rendered-demo-section{padding-top:34px}