:root{
  --ink:#1a1d24; --mut:#5c6470; --line:#e6e8ec; --bg:#ffffff; --soft:#f6f7f9;
  --acc:#2f6df0; --acc2:#0fae8e; --red:#e5484d; --green:#19a974;
  --maxw:900px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:Inter,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}

/* nav */
#topnav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:11px 20px;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;letter-spacing:.5px;color:var(--ink)}
.nav-links a{color:var(--mut);font-size:14.5px;font-weight:500;margin-left:18px}
.nav-links a:hover{color:var(--acc);text-decoration:none}
@media(max-width:640px){.nav-links a{margin-left:11px;font-size:13px}}

/* hero */
.hero{max-width:var(--maxw);margin:0 auto;padding:46px 20px 10px;text-align:center}
.title{font-family:Newsreader,Georgia,serif;font-size:46px;line-height:1.08;margin:0 0 6px;font-weight:500;letter-spacing:-.5px}
.subtitle{font-size:20px;color:var(--mut);margin:0 0 22px;font-weight:500}
.authors{font-size:18px;margin:6px 0 2px}
.authors a{color:var(--ink);font-weight:600}
.affil{color:var(--mut);margin:2px 0;font-size:15.5px}
.venue{color:var(--acc);font-weight:700;letter-spacing:1px;font-size:14px;margin:4px 0 20px;text-transform:uppercase}
.buttons{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.btn{background:var(--ink);color:#fff;padding:9px 17px;border-radius:30px;font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:8px;transition:.15s}
.btn:hover{background:var(--acc);text-decoration:none;transform:translateY(-1px)}
.hero-video{border-radius:14px;overflow:hidden;box-shadow:0 12px 40px rgba(0,0,0,.16);margin:8px 0 10px}
.hero-video video{width:100%;display:block}
.tagline{color:var(--mut);font-style:italic;font-size:15.5px}

/* sections */
.section{max-width:var(--maxw);margin:0 auto;padding:44px 20px}
.section.alt{background:var(--soft);max-width:none}
.section.alt>*{max-width:var(--maxw);margin-left:auto;margin-right:auto}
.section h2{font-family:Newsreader,serif;font-weight:500;font-size:30px;text-align:center;margin:0 0 22px}
.section h3{font-size:20px;font-weight:700;margin:34px 0 8px;text-align:center}
.prose{font-size:17px;color:#2b303a}
.prose.center,.cap{text-align:center}
.prose b{color:var(--ink)}
.figure{display:block;margin:0 auto;max-width:100%;border-radius:10px}
.cap{color:var(--mut);font-size:14.5px;margin-top:10px}
.dot{display:inline-block;width:11px;height:11px;border-radius:50%;vertical-align:middle}
.dot.green{background:var(--green)} .dot.red{background:var(--red)}

/* live demo */
.demo-wrap{display:grid;grid-template-columns:1fr 280px;gap:22px;align-items:start;margin-top:18px}
@media(max-width:760px){.demo-wrap{grid-template-columns:1fr}}
#deformCanvas{width:100%;background:#0f1320;border-radius:12px;box-shadow:0 8px 28px rgba(0,0,0,.18);cursor:grab;touch-action:none}
.demo-controls{font-size:14.5px}
.ctl{margin-bottom:14px}
.ctl label{display:block;color:var(--mut);margin-bottom:5px}
.ctl input[type=range]{width:100%}
.presets{margin:10px 0}
.presets span{display:block;color:var(--mut);margin-bottom:6px}
.presets button,.reset{background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:6px 11px;margin:3px 4px 3px 0;cursor:pointer;font-size:13.5px;font-weight:600}
.presets button:hover,.reset:hover{border-color:var(--acc);color:var(--acc)}
.reset{display:block;margin-top:10px;background:#fff}
.chk{display:block;margin-top:12px;color:var(--mut);font-size:13.5px}

/* shapes */
.shape-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-top:14px}
@media(max-width:760px){.shape-grid{grid-template-columns:repeat(3,1fr)}}
.shape-card{position:relative;border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#0f1320;aspect-ratio:1}
.shape-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;transition:opacity .25s}
.shape-card .ours{opacity:0}
.shape-card:hover .ours{opacity:1}
.shape-card:hover .target{opacity:0}
.shape-card .lbl{position:absolute;left:7px;bottom:6px;color:#cfe;font-size:11px;font-weight:600;z-index:2;text-shadow:0 1px 3px #000}

/* comparison sliders */
.slider-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:14px}
@media(max-width:760px){.slider-row{grid-template-columns:1fr}}
.scene-block{margin-top:18px}
.scene-label{font-weight:700;color:var(--mut);font-size:14px;text-transform:capitalize;margin:0 0 8px;text-align:center;letter-spacing:.3px}
.triple{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
@media(max-width:760px){.triple{grid-template-columns:1fr}}
.cmp{position:relative;border-radius:10px;overflow:hidden;user-select:none;border:1px solid var(--line);aspect-ratio:1.5}
.cmp img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.cmp .top{clip-path:inset(0 50% 0 0)}
.cmp .handle{position:absolute;top:0;bottom:0;left:50%;width:2px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.3);cursor:ew-resize}
.cmp .handle::after{content:"⇆";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;color:#222;border-radius:50%;width:30px;height:30px;display:flex;align-items:center;justify-content:center;font-size:14px;box-shadow:0 2px 6px rgba(0,0,0,.3)}
.cmp .tagL,.cmp .tagR,.cmp .tagM{position:absolute;top:8px;color:#fff;font-size:12px;font-weight:700;background:rgba(0,0,0,.5);padding:2px 8px;border-radius:20px;z-index:3}
.cmp .tagL{left:8px} .cmp .tagR{right:8px}
.cmp .tagM{left:50%;transform:translateX(-50%)}
/* deformation sliders: uniform 1.79 box; fill by cropping the TOP only (bottom + red inset kept) */
#defSliders .cmp{aspect-ratio:1.79;background:#0f1320}
#defSliders .cmp img{object-fit:cover;object-position:center bottom}

/* fly-through videos */
.video-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:14px}
@media(max-width:760px){.video-grid{grid-template-columns:1fr}}
.video-grid figure{margin:0}
.video-grid video{width:100%;display:block;border-radius:10px;border:1px solid var(--line);background:#000}
.video-grid figcaption{text-align:center;color:var(--mut);font-size:13px;margin-top:6px;text-transform:capitalize}

/* fly-through comparison (synced video slider + magnifier) */
.flyby{margin-top:14px}
.flyby-stage{position:relative;border-radius:10px;overflow:hidden;border:1px solid var(--line);background:#000;cursor:crosshair}
.flyby-stage video{position:absolute;inset:0;width:100%;height:100%;object-fit:fill;display:block}
.flyby-stage #fbTop{clip-path:inset(0 50% 0 0)}
.flyby-stage .tagL,.flyby-stage .tagR{position:absolute;top:8px;color:#fff;font-size:12px;font-weight:700;background:rgba(0,0,0,.55);padding:2px 9px;border-radius:20px;z-index:4}
.flyby-stage .tagL{left:8px} .flyby-stage .tagR{right:8px}
.fbhandle{position:absolute;top:0;bottom:0;left:50%;width:2px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.35);cursor:ew-resize;z-index:5}
.fbhandle::after{content:"⇆";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;color:#222;border-radius:50%;width:30px;height:30px;display:flex;align-items:center;justify-content:center;font-size:14px;box-shadow:0 2px 6px rgba(0,0,0,.35)}
.fblens{position:absolute;width:180px;height:180px;border-radius:50%;border:3px solid #fff;box-shadow:0 4px 16px rgba(0,0,0,.45);pointer-events:none;display:none;z-index:6}
.flyby-ctrl{display:flex;align-items:center;gap:12px;margin-top:10px;flex-wrap:wrap}
.fbbtn{background:var(--soft);border:1px solid var(--line);border-radius:8px;padding:6px 13px;cursor:pointer;font-size:14px;font-weight:600}
.fbbtn:hover{border-color:var(--acc);color:var(--acc)} .fbbtn.sm{padding:5px 10px}
.fbseek{flex:1;min-width:160px}
.kf{font-size:13.5px;color:var(--mut)}

/* table */
.table-wrap{margin-top:8px}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{padding:9px 12px;border-bottom:1px solid var(--line);text-align:center}
th{color:var(--mut);font-weight:600}
td:first-child,th:first-child{text-align:left}
tr.ours{background:rgba(47,109,240,.07)}
tr.ours td{font-weight:600}

/* bibtex */
.bib{position:relative;max-width:760px;margin:0 auto}
.bib pre{background:#0f1320;color:#dbe4f0;padding:18px 20px;border-radius:10px;overflow:auto;font-size:13.5px;line-height:1.5;font-family:ui-monospace,Menlo,Consolas,monospace}
.copy{position:absolute;top:10px;right:10px;background:#2a3147;color:#cfe;border:none;border-radius:7px;padding:6px 11px;cursor:pointer;font-size:12.5px}
.copy:hover{background:var(--acc)}

footer{max-width:var(--maxw);margin:0 auto;padding:30px 20px 60px;text-align:center;color:var(--mut);font-size:14px;border-top:1px solid var(--line)}
.ai.ai-arxiv:before{content:"arXiv";font-style:normal;font-weight:700;font-size:12px}