:root {
  --blue: #1559b8;
  --blue-dark: #0a2c64;
  --ink: #1f2937;
  --muted: #667085;
  --line: #e7ebf0;
  --alt: #f7f9fc;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  background: #fff;
}
a { color: inherit; }
button { font: inherit; }
.container { width: min(1120px, calc(100% - 40px)); margin: auto; }
.container.narrow { width: min(820px, calc(100% - 40px)); }
.center { text-align: center; }
.section { padding: 42px 0; }
.section-alt { background: var(--alt); }
h1, h2 { margin: 0 0 22px; line-height: 1.15; }
h2 { font-size: clamp(2rem, 4vw, 3.15rem); text-align: center; }

/* OmniVBench-style immersive video wall */
.hero {
  position: relative;
  display: grid;
  place-items: center;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
  isolation: isolate;
  color: #fff;
  text-align: center;
  background: #d9d5cc;
}
.cover-perspective {
  position: absolute;
  inset: calc(-12vw - 2vh) -10%;
  overflow: hidden;
  perspective: 1400px;
}
.dataset-wall {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  width: 100%;
  height: 100%;
  transform: translate3d(var(--pointer-x, 0px), var(--pointer-y, 0px), 0)
    rotateX(13deg) rotateZ(-13deg)
    scale(calc(1.03 + var(--cover-progress, 0) * .1));
  transform-origin: 50% 42%;
  transition: transform .7s ease;
  animation: wall-arrive 1.8s cubic-bezier(.2, .7, .2, 1) both;
}
.wall-column {
  position: relative;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}
.wall-track {
  display: flex;
  flex-direction: column;
  gap: 16px;
  will-change: transform;
}
.wall-tile {
  position: relative;
  flex-shrink: 0;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 6px;
  background: #343b3d;
  box-shadow: 0 16px 55px rgba(28, 41, 46, .22);
}
.wall-tile.ratio-235 { aspect-ratio: 2.35; }
.wall-tile.ratio-2 { aspect-ratio: 2; }
.wall-tile.ratio-169 { aspect-ratio: 16 / 9; }
.wall-tile.ratio-43 { aspect-ratio: 4 / 3; }
.wall-tile video,
.wall-poster {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: saturate(.82);
}
.wall-poster {
  position: absolute;
  z-index: 1;
  inset: 0;
  background: #343b3d;
  pointer-events: none;
}
.wall-poster.is-video-ready {
  visibility: hidden;
  opacity: 0;
}
.cover-play {
  position: absolute;
  z-index: 4;
  right: 24px;
  bottom: 24px;
  padding: 10px 18px;
  border: 1px solid rgba(255, 255, 255, .6);
  border-radius: 8px;
  color: #fff;
  background: #0a2c64;
  cursor: pointer;
}
.cover-play[hidden] { display: none; }
.cover-play:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }
.cover-shade {
  position: absolute;
  z-index: 1;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 44%, rgba(2, 18, 49, .8) 0%, rgba(2, 18, 49, .62) 34%, rgba(2, 18, 49, .12) 73%),
    linear-gradient(0deg, rgba(10, 44, 100, .42), rgba(2, 18, 49, .08) 35%, rgba(2, 18, 49, .2));
  pointer-events: none;
}
.cover-grain {
  position: absolute;
  z-index: 2;
  inset: 0;
  opacity: .08;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath fill='%23fff' filter='url(%23n)' opacity='.6' d='M0 0h180v180H0z'/%3E%3C/svg%3E");
}
.hero-content {
  position: relative;
  z-index: 3;
  width: min(1100px, calc(100% - 40px));
  text-shadow: 0 2px 18px rgba(0, 0, 0, .45);
  pointer-events: none;
}
.hero-content h1 {
  margin-bottom: 24px;
  letter-spacing: -.05em;
  line-height: 1.05;
}
.hero-project-name {
  display: block;
  font-size: clamp(3.2rem, 7vw, 6.5rem);
}
.hero-project-subtitle {
  display: block;
  max-width: 1050px;
  margin: 12px auto 0;
  font-size: clamp(1.35rem, 3vw, 2.5rem);
  line-height: 1.25;
  letter-spacing: -.025em;
}
.hero-subtitle {
  max-width: 900px;
  margin: 0 auto;
  font-size: clamp(1.1rem, 2.3vw, 2rem);
}

@keyframes wall-arrive {
  from { opacity: 0; scale: 1.08; }
  to { opacity: 1; scale: 1; }
}

/* Paper information */
.paper-intro { padding-top: 29px; padding-bottom: 30px; }
.project-title { font-size: clamp(1.6rem, 3vw, 2.35rem); font-weight: 750; }
.authors {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 12px 0 18px;
  font-size: 1.16rem;
  font-weight: 700;
  line-height: 1.5;
}
.authors a {
  color: var(--blue-dark);
  text-decoration: none;
}
.authors a:hover { text-decoration: underline; }
.affiliation-list p {
  margin: 2px 0;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.6;
}
.notes { color: var(--muted); font-size: .92rem; }
.notes { margin-top: 8px; }
.button-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.version-note {
  max-width: 900px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: .95rem;
  line-height: 1.8;
  text-align: center;
}
.version-note strong { color: var(--blue-dark); }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 19px;
  border: 1px solid transparent;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform .2s;
}
.button:hover { transform: translateY(-2px); }
.button small { font-weight: 500; opacity: .72; }
.button.dark { color: #fff; background: #172033; }

/* Content sections */
.section-lead {
  max-width: 760px;
  margin: -6px auto 36px;
  color: var(--muted);
  text-align: center;
}
.abstract-copy {
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.85;
  text-align: justify;
}
.media-placeholder {
  display: grid;
  place-items: center;
  width: min(960px, 100%);
  aspect-ratio: 16 / 9;
  margin: 36px auto 0;
  border: 1px dashed #b6c2d3;
  border-radius: 14px;
  color: #73809a;
  background: repeating-linear-gradient(135deg, #edf2f8 0, #edf2f8 13px, #e5ebf4 13px, #e5ebf4 26px);
}
.caption {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: .92rem;
  text-align: center;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Demo video player */
.demo-section { padding-top: 36px; }
.demo-player {
  width: min(1080px, 100%);
  margin: 0 auto;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 12px 36px rgba(17, 35, 64, .08);
}
.demo-viewport {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  background: #101828;
}
.demo-viewport:focus-visible { outline: 3px solid rgba(21, 89, 184, .45); outline-offset: 3px; }
.demo-viewport video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
}
.demo-arrow {
  position: absolute;
  z-index: 2;
  top: 50%;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  color: #fff;
  background: rgba(16, 24, 40, .58);
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  transform: translateY(-50%);
  transition: background .2s, transform .2s;
}
.demo-arrow:hover { background: rgba(21, 89, 184, .85); transform: translateY(-50%) scale(1.05); }
.demo-prev { left: 16px; }
.demo-next { right: 16px; }
.demo-toolbar {
  display: grid;
  grid-template-columns: auto auto minmax(180px, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  padding: 12px;
  border-radius: 12px;
  background: var(--alt);
}
.demo-control {
  min-width: 82px;
  padding: 9px 14px;
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  color: var(--ink);
  background: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .2s, color .2s, background .2s;
}
.demo-control:hover,
.demo-control.primary {
  border-color: var(--blue);
  color: #fff;
  background: var(--blue);
}
#demo-seek {
  width: 100%;
  accent-color: var(--blue);
  cursor: pointer;
}
.demo-time {
  min-width: 92px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  text-align: center;
  white-space: nowrap;
}
.demo-speed {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: .92rem;
  white-space: nowrap;
}
.demo-speed select {
  padding: 7px 10px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
}
.demo-pagination {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}
.demo-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-height: 54px;
  padding: 8px 6px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  background: #fff;
  font-size: .78rem;
  cursor: pointer;
}
.demo-page span {
  overflow: hidden;
  max-width: 100%;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.demo-page:hover,
.demo-page.active {
  border-color: var(--blue);
  color: var(--blue);
  background: #eef4ff;
}

/* Approach cards */
.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 36px;
}
.flip-card {
  min-height: 300px;
  perspective: 1200px;
}
.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform .7s;
  transform-style: preserve-3d;
}
.flip-card:hover .flip-inner,
.flip-card:focus-within .flip-inner {
  transform: rotateY(180deg);
}
.flip-front,
.flip-back {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 14px;
  backface-visibility: hidden;
  box-shadow: 0 10px 28px rgba(17, 35, 64, .1);
}
.flip-front.card-placeholder {
  width: 100%;
  height: 100%;
  margin: 0;
  aspect-ratio: auto;
  padding: 28px;
  color: #fff;
  background: #0f3f86;
  font-size: clamp(1.25rem, 1.6vw, 1.5rem);
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
}
.flip-back {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
  color: #73809a;
  background: repeating-linear-gradient(135deg, #edf2f8 0, #edf2f8 13px, #e5ebf4 13px, #e5ebf4 26px);
  align-items: center;
  text-align: center;
  transform: rotateY(180deg);
}
.flip-back h3 { margin: 0 0 14px; }
.flip-back p {
  margin: 0;
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
}

/* Citation */
.bibtex {
  margin: 0;
  padding: 22px;
  overflow: auto;
  border-radius: 10px;
  color: #e7edf7;
  background: #101828;
  font-size: .9rem;
  line-height: 1.7;
}

/* Failure cases */
.failure-note {
  max-width: 720px;
  margin: -6px auto 34px;
  color: var(--muted);
  text-align: center;
}
.failure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.failure-card {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 8px 28px rgba(17, 35, 64, .07);
}
.failure-card video {
  display: block;
  width: 100%;
  border-radius: 9px;
  background: #101828;
  object-fit: contain;
}
.failure-card:first-child video { aspect-ratio: 2; }
.failure-card:last-child video { aspect-ratio: 16 / 9; }
.failure-card figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: .92rem;
  text-align: center;
}

footer { padding: 38px 0; color: #dbe7ff; background: #0d2349; }

/* Floating section navigation */
.floating-nav {
  position: fixed;
  z-index: 20;
  top: 50%;
  right: 20px;
  transform: translateY(-50%);
}
.nav-trigger {
  width: 54px;
  height: 54px;
  border: 1px solid #d7dee9;
  border-radius: 50%;
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 5px 16px rgba(0, 0, 0, .12);
  font-size: 1.25rem;
  cursor: pointer;
}
.nav-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  padding: 10px 0;
  overflow: hidden;
  visibility: hidden;
  opacity: 0;
  border-radius: 14px;
  background: rgba(255, 255, 255, .97);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .18);
  transition: .25s;
}
.floating-nav:hover .nav-panel,
.floating-nav:focus-within .nav-panel { width: 190px; visibility: visible; opacity: 1; }
.floating-nav:hover .nav-trigger,
.floating-nav:focus-within .nav-trigger { opacity: 0; }
.nav-panel a {
  display: block;
  padding: 9px 18px;
  color: #4b5563;
  font-size: .92rem;
  text-decoration: none;
}
.nav-panel a:hover,
.nav-panel a.active { color: var(--blue); background: #eef4ff; }

@media (max-width: 1100px) {
  .dataset-wall { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .wall-column:nth-child(n + 4) { display: none; }
}

@media (max-width: 720px) {
  .section { padding: 29px 0; }
  .hero { height: 100svh; min-height: 520px; }
  .cover-perspective { inset: -10% -65%; }
  .dataset-wall {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    height: 100%;
  }
  .wall-column:nth-child(n + 4) { display: none; }
  .wall-track { gap: 10px; }
  .hero-project-name { font-size: clamp(2.2rem, 9vw, 3.8rem); }
  .hero-project-subtitle { font-size: clamp(.95rem, 4.4vw, 1.35rem); }
  .hero-subtitle { font-size: 1.05rem; }
  .floating-nav { right: 12px; }
  .button { padding: 9px 14px; font-size: .92rem; }
  .approach-grid { grid-template-columns: 1fr; }
  .flip-card { min-height: 260px; }
  .media-placeholder { aspect-ratio: 4 / 3; }
  .demo-player { padding: 10px; }
  .demo-toolbar {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  #demo-seek { grid-column: 1 / -1; order: -1; }
  .demo-time { justify-self: center; }
  .demo-speed { justify-self: end; }
  .demo-pagination { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .demo-arrow { width: 38px; height: 38px; font-size: 1.6rem; }
  .failure-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .dataset-wall { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .wall-column:nth-child(n + 3) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dataset-wall,
  .wall-column { animation: none !important; }
  .dataset-wall {
    transform: rotateX(13deg) rotateZ(-13deg) scale(1.03);
    transition: none;
  }
  .button { transition: none; }
}