:root{
  --ink:#14171c; --mut:#5b6472; --line:#e6e9ee; --bg:#ffffff; --soft:#f6f8fb;
  --accent:#2f6fb5; --accent-soft:#e8f0fa;
}
*{box-sizing:border-box}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  line-height:1.6; -webkit-font-smoothing:antialiased;
}
section{max-width:1080px; margin:0 auto; padding:64px 24px}
h2{font-size:1.6rem; font-weight:700; letter-spacing:-.01em; margin:0 0 8px; text-align:center}
.lead{margin:0 auto 28px; max-width:640px; text-align:center; color:var(--mut); font-size:1.02rem}
.cap{margin:12px auto 0; max-width:760px; text-align:center; color:var(--mut); font-size:.88rem}

/* hero */
.hero{max-width:1080px; margin:0 auto; padding:72px 24px 12px; text-align:center}
.hero h1{font-size:3.4rem; font-weight:800; letter-spacing:-.03em; margin:0}
.accent{color:var(--accent)}
.subtitle{margin:10px 0 26px; font-size:1.14rem; color:var(--mut); font-weight:500}
.authors{font-size:1.04rem; font-weight:600}
.authors span{color:var(--ink); margin:0 10px}
.affil{margin-top:8px; color:var(--mut); font-size:.9rem}
.btns{margin:26px 0 8px; display:flex; gap:10px; justify-content:center; flex-wrap:wrap}
.btn{
  display:inline-flex; align-items:center; gap:8px; padding:10px 20px; border-radius:999px;
  background:var(--ink); color:#fff; text-decoration:none; font-size:.94rem; font-weight:600;
  transition:transform .15s ease, background .15s ease;
}
.btn:hover{transform:translateY(-2px); background:var(--accent)}
.btn.dim{background:#aeb6c2; cursor:default}
.btn.dim:hover{transform:none; background:#aeb6c2}
.btn em{font-style:normal; opacity:.75; font-size:.8rem}
.stats{margin:34px auto 0; display:flex; gap:12px; justify-content:center; flex-wrap:wrap}
.stats div{
  min-width:126px; padding:14px 18px; border-radius:14px;
  background:var(--soft); border:1px solid var(--line);
}
.stats b{display:block; font-size:1.7rem; font-weight:800; letter-spacing:-.02em; color:var(--accent)}
.stats span{font-size:.78rem; color:var(--mut); text-transform:uppercase; letter-spacing:.06em}

/* tabs */
.tabs{display:flex; gap:8px; justify-content:center; margin:0 0 18px}
.tab{
  padding:7px 18px; border-radius:999px; border:1px solid var(--line); background:#fff;
  font:inherit; font-size:.9rem; font-weight:600; color:var(--mut); cursor:pointer;
  transition:all .15s ease;
}
.tab:hover{border-color:var(--accent); color:var(--accent)}
.tab.on{background:var(--accent); border-color:var(--accent); color:#fff}

/* hero video */
.band{max-width:1080px; margin:0 auto; padding:24px 24px 8px}
.band video{width:100%; border-radius:16px; display:block; box-shadow:0 12px 40px rgba(20,23,28,.14)}

/* comparison slider */
.slider{
  position:relative; max-width:900px; margin:0 auto; border-radius:16px; overflow:hidden;
  cursor:ew-resize; user-select:none; box-shadow:0 12px 40px rgba(20,23,28,.14); line-height:0;
}
.slider img{width:100%; display:block; pointer-events:none}
.slider .clip{position:absolute; inset:0 auto 0 0; width:50%; overflow:hidden}
.slider .clip img{position:absolute; top:0; left:0; max-width:none}
.handle{
  position:absolute; top:0; bottom:0; left:50%; width:3px; background:#fff; transform:translateX(-1.5px);
  box-shadow:0 0 12px rgba(0,0,0,.35); display:flex; align-items:center; justify-content:center;
}
.handle i{
  background:#fff; color:var(--ink); width:38px; height:38px; border-radius:50%;
  display:flex; align-items:center; justify-content:center; font-size:.9rem;
  box-shadow:0 4px 14px rgba(0,0,0,.28);
}
.tagL,.tagR{
  position:absolute; bottom:14px; padding:5px 12px; border-radius:999px;
  background:rgba(20,23,28,.72); color:#fff; font-size:.78rem; font-weight:600; line-height:1.4;
}
.tagL{left:14px} .tagR{right:14px; background:var(--accent)}

/* figures */
.wide{width:100%; border-radius:14px; border:1px solid var(--line); display:block}
.zoom{transition:transform .3s ease; cursor:zoom-in}
.zoom:hover{transform:scale(1.02)}

/* method cards */
.cards{display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:14px; margin-top:24px}
.card{padding:20px; border-radius:14px; background:var(--soft); border:1px solid var(--line)}
.card b{display:block; font-size:1.05rem; color:var(--accent); margin-bottom:6px}
.card span{font-size:.9rem; color:var(--mut)}

/* results table */
.tw{overflow-x:auto; border-radius:14px; border:1px solid var(--line)}
table{width:100%; border-collapse:collapse; font-size:.9rem; min-width:760px}
th,td{padding:10px 12px; text-align:center; border-bottom:1px solid var(--line)}
th{background:var(--soft); font-weight:700; font-size:.82rem}
tr.sub th{font-size:.76rem; color:var(--mut); font-weight:600}
td:first-child,th:first-child{text-align:left}
td.b{font-weight:700; color:var(--accent)}
tr.ours{background:var(--accent-soft)}
tr.ours td{border-bottom:none}

/* ablation */
.abl{max-width:620px; margin:32px auto 0; border:1px solid var(--line); border-radius:14px; overflow:hidden}
.abl .row{display:grid; grid-template-columns:repeat(6,1fr); text-align:center; font-size:.9rem}
.abl .row span{padding:10px 4px; border-bottom:1px solid var(--line)}
.abl .head span{background:var(--soft); font-weight:700; font-size:.8rem}
.abl .on{background:var(--accent-soft); font-weight:700}
.abl .on span{border-bottom:none}

/* gif grid */
.grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:16px}
.grid figure{margin:0}
.grid img{width:100%; border-radius:12px; display:block; border:1px solid var(--line)}
.grid figcaption{margin-top:8px; text-align:center; color:var(--mut); font-size:.86rem}

/* bibtex */
.cite pre{
  background:var(--ink); color:#e8edf4; padding:20px 22px; border-radius:14px;
  overflow-x:auto; font-size:.84rem; line-height:1.6;
}
footer{padding:40px 24px 56px; text-align:center; color:var(--mut); font-size:.85rem}

@media (max-width:640px){
  .hero h1{font-size:2.3rem}
  .hero{padding-top:48px}
  section{padding:44px 18px}
  .stats div{min-width:104px; padding:11px 13px}
  .stats b{font-size:1.35rem}
}