/* ===== Variables ===== */
:root {
  --bg: #08090c;
  --bg-dark: #050608;
  --bg-card: #0f1117;
  --border: #1a1d25;
  --border-mid: #222630;
  --text: #dde1ed;
  --muted: #7a8399;
  --dim: #3d4357;
  --blue: #4f8ef7;
  --blue-lt: #84b4ff;
  --blue-dim: rgba(79,142,247,0.12);
  --green: #4ade80;
  --red: #f87171;
  --yellow: #fbbf24;
  --radius: 12px;
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; transition: color .2s; }
a:hover { color: var(--blue-lt); }
img { max-width: 100%; display: block; border-radius: var(--radius); }
figure { margin: 0; }
figcaption {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.6;
  text-align: center;
}

/* ===== Layout ===== */
.container { max-width: 1060px; margin: 0 auto; padding: 0 28px; }
.container.narrow { max-width: 720px; }

/* ===== Hero ===== */
.hero {
  padding: 76px 0 64px;
  text-align: center;
  background: radial-gradient(ellipse 90% 50% at 50% -10%,
    rgba(79,142,247,.1) 0%, transparent 65%);
  border-bottom: 1px solid var(--border);
}
.venue-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--blue-lt);
  background: var(--blue-dim);
  border: 1px solid rgba(79,142,247,.25);
  padding: 4px 14px;
  border-radius: 99px;
  margin-bottom: 28px;
}
.title {
  font-size: clamp(26px, 4.5vw, 46px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.025em;
  color: #fff;
  margin-bottom: 28px;
}
.rise {
  background: linear-gradient(120deg, var(--blue) 0%, var(--blue-lt) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.br-lg { display: block; }
@media(max-width:600px) { .br-lg { display: none; } }

.authors {
  font-size: 17px;
  color: var(--text);
  margin-bottom: 6px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 2px;
}
.author { font-weight: 500; }
.sep { color: var(--muted); margin-right: 6px; }
.affil { font-size: 14px; color: var(--muted); margin-bottom: 36px; }

.hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

/* Pills */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  border: 1px solid transparent;
}
.pill-blue {
  background: var(--blue);
  color: #fff;
}
.pill-blue:hover {
  background: var(--blue-lt);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79,142,247,.35);
}
.pill-ghost {
  background: var(--bg-card);
  color: var(--text);
  border-color: var(--border-mid);
}
.pill-ghost:hover {
  border-color: var(--blue);
  color: var(--blue-lt);
  transform: translateY(-1px);
}
.soon {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
  background: var(--border-mid);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--muted);
}

/* ===== Sections ===== */
.section { padding: 80px 0; }
.section-dark {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* Section heading */
.sh {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: #fff;
  margin-bottom: 16px;
}
.sh.centered { text-align: center; }
.sub {
  font-size: 16px;
  color: var(--muted);
  max-width: 620px;
  margin-bottom: 48px;
  line-height: 1.7;
}
.sub.centered { text-align: center; margin-left: auto; margin-right: auto; }

/* ===== Teaser ===== */
.teaser-section {
  padding: 56px 0 0;
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border);
}
.teaser-fig {
  padding-bottom: 56px;
}
.teaser-fig img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border-mid);
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
}
.teaser-fig figcaption {
  max-width: 680px;
  margin: 14px auto 0;
  font-size: 14px;
}

/* ===== Abstract ===== */
.abstract-box {
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 32px 36px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.abstract-box p {
  font-size: 15.5px;
  color: var(--muted);
  line-height: 1.8;
}
.abstract-box strong { color: var(--text); }
.abstract-box em { color: var(--blue-lt); font-style: normal; font-weight: 500; }

/* ===== Stat row ===== */
.stat-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
}
.stat {
  flex: 1;
  min-width: 160px;
  text-align: center;
  padding: 32px 20px;
}
.stat-div {
  width: 1px;
  height: 64px;
  background: var(--border-mid);
  flex-shrink: 0;
}
.stat-n {
  font-size: 44px;
  font-weight: 700;
  color: var(--blue-lt);
  letter-spacing: -.03em;
  line-height: 1;
  margin-bottom: 8px;
}
.stat-n span { font-size: 26px; color: var(--blue); }
.stat-l {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}
.stat-s { font-size: 12.5px; color: var(--muted); }

/* ===== Figures ===== */
.fig {
  margin: 0 0 48px;
}
.fig img {
  width: 100%;
  border: 1px solid var(--border-mid);
  background: var(--bg-card);
  box-shadow: 0 4px 24px rgba(0,0,0,.4);
}
.fig-wide img {
  max-height: 520px;
  object-fit: contain;
  background: var(--bg-card);
}
.fig:last-child { margin-bottom: 0; }

/* ===== Method grid ===== */
.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 48px 0;
}
@media(max-width:780px) { .method-grid { grid-template-columns: 1fr; } }

.mcard {
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color .2s;
}
.mcard:hover { border-color: var(--blue); }
.mcard-tag {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--blue);
  margin-bottom: 10px;
}
.mcard h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: -.01em;
  line-height: 1.3;
}
.mcard p {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 14px;
}
.mcard p strong { color: var(--text); }
.mcard ul {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
}
.mcard li {
  font-size: 13.5px;
  color: var(--muted);
  padding: 5px 0 5px 18px;
  position: relative;
}
.mcard li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 700;
}
.mcard-fig img {
  border: 1px solid var(--border);
  background: var(--bg);
}
.mcard-fig figcaption { text-align: left; font-size: 12.5px; }

/* Inversion row */
.inversion-row {
  display: flex;
  gap: 40px;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  padding: 36px;
  margin-top: 8px;
}
@media(max-width:700px) { .inversion-row { flex-direction: column; } }
.inversion-text { flex: 1; }
.inversion-text h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}
.inversion-text p {
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.75;
}
.inversion-fig {
  flex: 1;
  max-width: 420px;
}
.inversion-fig img { border: 1px solid var(--border); background: var(--bg); }
.inversion-fig figcaption { font-size: 12.5px; }

/* ===== Dataset ===== */
.ds-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
@media(max-width:600px) { .ds-stats { grid-template-columns: 1fr; } }
.ds-stat {
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
}
.ds-n {
  font-size: 38px;
  font-weight: 700;
  color: var(--blue-lt);
  letter-spacing: -.02em;
  margin-bottom: 6px;
}
.ds-l { font-size: 13.5px; color: var(--muted); font-weight: 500; }
.ds-desc {
  max-width: 640px;
  margin: 40px auto 0;
  text-align: center;
}
.ds-desc p { font-size: 15px; color: var(--muted); line-height: 1.75; }

/* ===== Comparison table ===== */
.table-wrap { overflow-x: auto; }
.comp-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14px;
}
.comp-table thead tr {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-mid);
}
.comp-table th {
  padding: 14px 20px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  text-align: left;
}
.comp-table td {
  padding: 13px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.comp-table tbody tr:last-child td { border-bottom: none; }
.comp-table tbody tr:hover td { background: var(--bg-card); }
.ours-col {
  background: rgba(79,142,247,.05);
  color: var(--blue-lt) !important;
  font-weight: 600;
}
.good { color: var(--green); font-weight: 600; }
.bad  { color: var(--red); }
.mid  { color: var(--yellow); }

/* ===== BibTeX ===== */
.bibtex-wrap {
  position: relative;
}
.bibtex {
  background: var(--bg-card);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius);
  padding: 28px 32px;
  overflow-x: auto;
}
.bibtex code {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.75;
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--bg);
  border: 1px solid var(--border-mid);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 7px;
  cursor: pointer;
  transition: all .2s;
  font-family: var(--font);
}
.copy-btn:hover { border-color: var(--blue); color: var(--blue-lt); }
.copy-btn.done { border-color: var(--green); color: var(--green); }

/* ===== Footer ===== */
.footer {
  padding: 36px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer p { font-size: 13.5px; color: var(--dim); }
.footer a { color: var(--muted); }
.footer a:hover { color: var(--blue-lt); }
.footer strong { color: var(--muted); }

/* ===== Scroll fade-in ===== */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .55s ease, transform .55s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: none;
}