/* ============================================================
   RegHead — paper / dataset site
   ============================================================ */
:root{
  --bg:        #ffffff;
  --bg-soft:   #f4f5f9;
  --bg-hero:   radial-gradient(1200px 600px at 50% -10%, #eef1fb 0%, #f5f6fa 45%, #ffffff 100%);
  --ink:       #0d1018;
  --muted:     #5a6473;
  --faint:     #8b94a3;
  --line:      #e6e8ef;
  --card:      #ffffff;
  --accent:    #5b5bf6;
  --accent-2:  #9b4dff;
  --accent-ink:#4338ca;
  --grad:      linear-gradient(90deg, #5b5bf6 0%, #9b4dff 100%);
  --shadow-sm: 0 1px 2px rgba(16,20,30,.06), 0 2px 8px rgba(16,20,30,.05);
  --shadow-md: 0 6px 24px rgba(16,20,30,.10), 0 2px 6px rgba(16,20,30,.06);
  --shadow-lg: 0 20px 60px rgba(16,20,30,.16);
  --radius:    16px;
  --maxw:      1120px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Menlo", monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:var(--accent-ink);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:84px 0}
.section-soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
h2.h{font-size:clamp(26px,4vw,38px);letter-spacing:-.02em;margin:0 0 6px;font-weight:800}
.kicker{font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-ink)}
.lead{color:var(--muted);font-size:18px;max-width:none}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}

/* ===================== HERO ===================== */
.hero{
  min-height:100svh;
  background:var(--bg-hero);
  display:flex;flex-direction:column;
  position:relative;
  padding-bottom:28px;
}
.hero-top{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 24px;max-width:var(--maxw);margin:0 auto;width:100%;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.02em;font-size:18px}
.brand .dot{width:11px;height:11px;border-radius:50%;background:var(--grad);box-shadow:0 0 0 4px rgba(91,91,246,.14)}
.tag{font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:6px 12px;background:#fff}

.hero-body{flex:1;display:flex;flex-direction:column;justify-content:center;max-width:var(--maxw);margin:0 auto;width:100%;padding:8px 24px}
.hero-eyebrow{font-size:13px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--accent-ink);text-align:center}
.hero-title{
  text-align:center;font-weight:850;letter-spacing:-.03em;line-height:1.02;
  font-size:clamp(34px,6.4vw,68px);margin:10px 0 4px;
}
.hero-title .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{text-align:center;color:var(--muted);font-size:clamp(15px,2vw,19px);margin:0 auto 14px;max-width:680px}
.hero-stats{display:flex;gap:26px;justify-content:center;flex-wrap:wrap;color:var(--muted);font-size:14px;margin-bottom:12px}
.hero-stats b{color:var(--ink);font-weight:800}
.hero-stats span{display:inline-flex;align-items:center;gap:7px}
.hero-stats .sep{width:5px;height:5px;border-radius:50%;background:var(--accent);opacity:.5}

/* expression readout */
.readout{display:flex;align-items:baseline;justify-content:center;gap:14px;margin:4px 0 12px}
.readout .num{font-variant-numeric:tabular-nums;font-weight:800;font-size:14px;color:var(--faint)}
.readout .num b{color:var(--accent-ink);font-size:20px}
.readout .name{font-weight:800;letter-spacing:-.01em;font-size:clamp(16px,2.4vw,22px)}

/* horizontal filmstrip of identities */
.strip-shell{position:relative;width:100%}
.hero-strip{
  display:flex;gap:16px;width:100%;overflow-x:auto;overflow-y:hidden;
  scroll-snap-type:x proximity;padding:8px 6px 14px;cursor:grab;
  scrollbar-width:thin;scrollbar-color:#c7cbe0 transparent;
  -webkit-overflow-scrolling:touch;
}
.hero-strip.drag{cursor:grabbing;scroll-snap-type:none}
.hero-strip::-webkit-scrollbar{height:8px}
.hero-strip::-webkit-scrollbar-thumb{background:#c7cbe0;border-radius:999px}
.hero-strip::-webkit-scrollbar-track{background:transparent}
.tile{
  position:relative;flex:0 0 clamp(180px,24vw,244px);aspect-ratio:1/1;
  scroll-snap-align:center;border-radius:14px;overflow:hidden;
  background:#fff;box-shadow:var(--shadow-md);border:1px solid var(--line);
}
/* edge arrows */
.arr{
  position:absolute;top:calc(50% - 7px);transform:translateY(-50%);z-index:6;
  width:46px;height:46px;border-radius:50%;border:1px solid var(--line);
  background:rgba(255,255,255,.92);backdrop-filter:blur(6px);color:var(--ink);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:var(--shadow-md);transition:transform .12s,opacity .2s,box-shadow .2s;
}
.arr svg{width:20px;height:20px}
.arr:hover{transform:translateY(-50%) scale(1.07);box-shadow:var(--shadow-lg)}
.arr-l{left:-8px}.arr-r{right:-8px}
.arr.hidden{opacity:0;pointer-events:none}
@media(max-width:640px){.arr{display:none}}
.tile .frame{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .38s ease;user-select:none;pointer-events:none;
}
.tile .frame.on{opacity:1}
.tile-cap{
  position:absolute;left:0;right:0;bottom:0;padding:14px 10px 8px;
  font-size:11.5px;font-weight:700;color:#fff;letter-spacing:.01em;
  background:linear-gradient(transparent, rgba(8,10,16,.55));
  opacity:0;transition:opacity .25s;
}
.tile:hover .tile-cap{opacity:1}

/* slider control */
.control{margin:16px auto 0;max-width:880px;width:100%}
.track-wrap{position:relative;padding:0 4px}
input[type="range"].slider{
  -webkit-appearance:none;appearance:none;width:100%;height:8px;border-radius:999px;
  background:linear-gradient(90deg,var(--accent) var(--fill,0%), #e3e6ef var(--fill,0%));
  outline:none;cursor:pointer;margin:0;
}
input[type="range"].slider::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;width:24px;height:24px;border-radius:50%;
  background:#fff;border:3px solid var(--accent);box-shadow:var(--shadow-md);cursor:grab;
  transition:transform .12s;
}
input[type="range"].slider:active::-webkit-slider-thumb{transform:scale(1.12);cursor:grabbing}
input[type="range"].slider::-moz-range-thumb{
  width:22px;height:22px;border-radius:50%;background:#fff;border:3px solid var(--accent);box-shadow:var(--shadow-md);cursor:grab;
}
.ticks{display:flex;justify-content:space-between;margin-top:12px;gap:4px}
.tick{
  flex:1;text-align:center;font-size:10.5px;line-height:1.25;color:var(--faint);
  cursor:pointer;font-weight:600;padding-top:4px;position:relative;transition:color .2s;
  border-top:2px solid transparent;
}
.tick.active{color:var(--accent-ink);border-top-color:var(--accent)}
.tick:hover{color:var(--ink)}
.ctl-row{display:flex;align-items:center;justify-content:center;gap:14px;margin-top:18px}
.playbtn{
  display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);background:#fff;
  color:var(--ink);font-weight:700;font-size:13.5px;padding:9px 16px;border-radius:999px;cursor:pointer;
  box-shadow:var(--shadow-sm);transition:transform .1s, box-shadow .2s;
}
.playbtn:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}
.playbtn svg{width:14px;height:14px;fill:var(--accent-ink)}
.hint{color:var(--faint);font-size:13px}

.scroll-cue{display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--faint);
  font-size:12px;letter-spacing:.12em;text-transform:uppercase;margin-top:8px;font-weight:700}
.scroll-cue .arrow{width:22px;height:22px;animation:bob 1.8s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

/* ===================== NAV (post-hero) ===================== */
.nav{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);
  backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid var(--line);
}
.nav-in{display:flex;align-items:center;justify-content:space-between;max-width:var(--maxw);margin:0 auto;padding:12px 24px}
.nav-links{display:flex;gap:22px;font-size:14px;font-weight:600}
.nav-links a{color:var(--muted)}
.nav-links a:hover{color:var(--ink);text-decoration:none}
@media(max-width:760px){.nav-links{display:none}}

/* ===================== TITLE BLOCK ===================== */
.paper-head{text-align:center;padding:70px 0 28px}
.confbadge{display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:.1em;color:#fff;
  background:var(--grad);padding:6px 14px;border-radius:999px;text-transform:uppercase}
.paper-title{font-size:clamp(28px,4.6vw,46px);font-weight:850;letter-spacing:-.03em;line-height:1.08;margin:20px auto 14px;max-width:900px}
.authors{color:var(--ink);font-size:18px;font-weight:600;margin:6px auto;max-width:820px}
.authors a{color:var(--ink);text-decoration:none;border-bottom:1.5px solid transparent;transition:color .15s,border-color .15s}
.authors a:hover{color:var(--accent-ink);border-bottom-color:var(--accent)}
.affil{color:var(--muted);font-size:15px;margin:4px 0 6px}
.placeholder-pill{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:#b4760a;background:#fff7e6;border:1px solid #ffe3a3;border-radius:999px;padding:3px 9px;vertical-align:middle}

.btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.btn{display:inline-flex;align-items:center;gap:9px;background:var(--ink);color:#fff;font-weight:700;font-size:14.5px;
  padding:11px 18px;border-radius:999px;box-shadow:var(--shadow-sm);transition:transform .1s,box-shadow .2s}
.btn:hover{transform:translateY(-1px);box-shadow:var(--shadow-md);text-decoration:none}
.btn.alt{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.grad{background:var(--grad)}
.btn svg{width:16px;height:16px;fill:currentColor}

/* ===================== STAT CARDS ===================== */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow-sm)}
.stat .v{font-size:clamp(26px,3.4vw,34px);font-weight:850;letter-spacing:-.02em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .l{color:var(--muted);font-size:13.5px;font-weight:600;margin-top:4px}
@media(max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}}

/* expression strip */
.strip-title{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin:36px 0 14px}
.strip{display:grid;grid-template-columns:repeat(10,1fr);gap:10px}
.strip figure{margin:0}
.strip img{width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:11px;border:1px solid var(--line);box-shadow:var(--shadow-sm);background:#fff}
.strip figcaption{font-size:10.5px;color:var(--faint);text-align:center;margin-top:6px;font-weight:600;line-height:1.2}
@media(max-width:900px){.strip{grid-template-columns:repeat(5,1fr)}}

/* distribution bars */
.cols{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:start;margin-top:30px}
@media(max-width:860px){.cols{grid-template-columns:1fr;gap:28px}}
.bars{display:flex;flex-direction:column;gap:14px}
.bar-row{display:grid;grid-template-columns:160px 1fr 52px;align-items:center;gap:12px;font-size:14px}
.bar-row .lab{color:var(--ink);font-weight:600}
.bar-track{height:12px;border-radius:999px;background:#eceef5;overflow:hidden}
.bar-fill{height:100%;border-radius:999px;background:var(--grad)}
.bar-row .pct{text-align:right;color:var(--muted);font-weight:700;font-variant-numeric:tabular-nums}
.note{color:var(--muted);font-size:14px;margin-top:10px}

/* pipeline */
.pipe{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}
@media(max-width:860px){.pipe{grid-template-columns:1fr}}
.pstep{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm);position:relative}
.pstep .n{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:9px;
  background:var(--grad);color:#fff;font-weight:800;font-size:15px;margin-bottom:12px}
.pstep h4{margin:0 0 6px;font-size:17px;font-weight:800;letter-spacing:-.01em}
.pstep p{margin:0;color:var(--muted);font-size:14px}
.pstep .eng{display:inline-block;margin-top:12px;font-size:11.5px;font-weight:700;color:var(--accent-ink);
  background:#f0f0fe;border:1px solid #e3e3fb;border-radius:999px;padding:3px 10px}

/* comparison table */
.table-card{margin-top:30px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm)}
table.cmp{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff}
table.cmp th,table.cmp td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
table.cmp thead th{background:var(--bg-soft);font-weight:800;letter-spacing:-.01em}
table.cmp tbody tr:last-child td{border-bottom:none}
table.cmp td:first-child,table.cmp th:first-child{color:var(--muted);font-weight:600}
table.cmp .hi{font-weight:800}

/* code block */
.code{background:#0e1018;color:#e7eaf2;border-radius:var(--radius);padding:20px 22px;overflow:auto;
  font-family:var(--mono);font-size:13px;line-height:1.65;box-shadow:var(--shadow-md);margin-top:22px}
.code .c{color:#7c87a3}
.code .k{color:#c4b5ff}
.code .s{color:#9ce3b0}

/* method figures */
.figure{margin:0 0 36px}
.figure img{width:100%;height:auto;display:block;border-radius:14px;border:1px solid var(--line);
  box-shadow:var(--shadow-md);background:#fff}
.figure figcaption{color:var(--muted);font-size:14.5px;line-height:1.62;margin:16px auto 0;max-width:980px;text-align:justify}
.figure figcaption .fnum{color:var(--ink);font-weight:800}

/* video result galleries */
.vid-sub{margin:26px 0 10px;font-size:15px;font-weight:800;letter-spacing:.01em;color:var(--muted)}
.vid-sub .tgt{color:var(--accent-ink)}
.vid-list{display:flex;flex-direction:column;gap:18px;margin-top:14px}
.vid{margin:0;background:var(--card);border:1px solid var(--line);border-radius:14px;
  overflow:hidden;box-shadow:var(--shadow-sm)}
.vid video{display:block;width:100%;height:auto;background:#0e1018}
.vid figcaption{padding:11px 16px;font-size:13.5px;color:var(--muted);border-top:1px solid var(--line)}
.vid figcaption b{color:var(--ink);font-weight:700}
.vid figcaption .vstyle{color:var(--faint);margin-left:8px;font-weight:600}

/* placeholder boxes */
.ph{border:2px dashed #d6dae6;border-radius:var(--radius);background:
  repeating-linear-gradient(45deg,#fafbfe,#fafbfe 12px,#f2f4fa 12px,#f2f4fa 24px);
  min-height:230px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  color:var(--faint);text-align:center;padding:24px}
.ph .big{font-weight:800;color:var(--muted);font-size:16px}
.ph-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}
@media(max-width:760px){.ph-grid{grid-template-columns:1fr}}

/* bibtex */
.bib{background:#0e1018;color:#dfe3ee;border-radius:var(--radius);padding:22px;font-family:var(--mono);
  font-size:13px;line-height:1.6;white-space:pre;overflow:auto;box-shadow:var(--shadow-md)}

/* footer */
footer{padding:46px 0;border-top:1px solid var(--line);color:var(--muted);font-size:13.5px;text-align:center}
footer .lic{margin-top:8px;color:var(--faint);font-size:12.5px;max-width:680px;margin-left:auto;margin-right:auto}

/* responsive */
@media(max-width:520px){
  .ticks{display:none}
  .section{padding:60px 0}
}