:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-2: #f1f4fb;
  --text: #18212f;
  --muted: #5d6b82;
  --line: #dbe3ef;
  --primary: #265dff;
  --primary-2: #1745ce;
  --accent: #22a87b;
  --shadow: 0 16px 40px rgba(15, 28, 63, 0.08);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.container {
  width: min(var(--container), calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  padding: 88px 0;
}

.muted-bg {
  background: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(239,244,252,0.72) 100%);
}

.section-head {
  text-align: center;
  margin-bottom: 32px;
}

.section-head.left-align {
  text-align: left;
}

.section-head h2 {
  margin: 0 0 10px;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1.2;
}

.section-head p,
.lead,
p {
  color: var(--muted);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  background: rgba(247, 248, 252, 0.75);
  border-bottom: 1px solid rgba(219, 227, 239, 0.8);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
}

.brand-badge {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), #7a9dff);
  color: #fff;
  border-radius: 12px;
  font-size: 0.95rem;
}

.brand-text {
  font-size: 1.05rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav a {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.96rem;
}

.nav a:hover {
  color: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-toggle,
.menu-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 700;
  cursor: pointer;
}

.menu-toggle {
  display: none;
}

.hero {
  padding-top: 54px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  justify-items: center;
  gap: 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 8px 12px;
  background: rgba(38, 93, 255, 0.08);
  color: var(--primary);
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-align: center;
}

.hero-subtitle {
  font-size: 1.06rem;
  margin: 18px 0 24px;
  max-width: 760px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 0;
  justify-content: center;
}

.hero-copy-centered {
  width: 100%;
  max-width: 980px;
  text-align: center;
}

.hero-authors {
  margin: 18px 0 10px;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 600;
}

.author-grid {
  margin: 20px auto 16px;
  width: min(100%, 980px);
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  gap: 24px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.author-name {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.2;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.author-name sup {
  font-size: 0.7em;
  vertical-align: super;
}

.author-link {
  color: inherit;
  text-decoration: none;
}

.author-link:hover {
  color: var(--primary);
  text-decoration: underline;
}

.hero-affiliations {
  margin: 0 auto 24px;
  width: min(100%, 860px);
  text-align: center;
}

.affiliation-slot {
  display: block;
  padding: 2px 0;
  color: var(--muted);
  font-weight: 500;
}

.affiliation-slot sup {
  font-size: 0.72em;
  vertical-align: super;
  margin-right: 4px;
  font-weight: 700;
  font-style: normal;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 14px;
  padding: 12px 18px;
  font-weight: 700;
  transition: 0.2s ease;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #5f84ff);
  color: #fff;
  box-shadow: 0 12px 30px rgba(38, 93, 255, 0.22);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--line);
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

.hero-meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.hero-meta strong {
  color: var(--text);
  margin-right: 8px;
}

.hero-visual,
.card-glow {
  position: relative;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, #ffffff, #f4f7ff);
  box-shadow: var(--shadow);
  border: 1px solid rgba(219, 227, 239, 0.9);
  overflow: hidden;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: -40% 35% auto auto;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(34,168,123,0.18), transparent 68%);
}

.hero-visual img {
  width: 100%;
  min-height: 360px;
  object-fit: cover;
}

.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
}

.feature-panel,
.contact-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  padding: 28px;
  box-shadow: var(--shadow);
}

.feature-panel h3,
.contact-panel h3,
.info-card h3,
.resource-card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 1.18rem;
}

.feature-list {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 16px;
  box-shadow: var(--shadow);
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
}

.stat-label {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-weight: 600;
}

.info-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.info-card,
.resource-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.dataset-subsections {
  display: grid;
  gap: 18px;
}

.dataset-subsection {
  padding: 6px 0 18px;
  border-bottom: 1px solid var(--line);
}

.dataset-subsection:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.dataset-subsection h3 {
  margin: 0 0 10px;
  font-size: 1.18rem;
}

.dataset-subsection p {
  margin: 0;
  color: var(--muted);
}

.dataset-photo-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.dataset-photo-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.dataset-photo-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: var(--surface-2);
}

.dataset-photo-card figcaption {
  padding: 8px 10px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}

.dataset-text-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}


.dataset-text-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.dataset-text-card summary {
  list-style: none;
  cursor: pointer;
  margin: 0;
  padding: 14px;
  font-size: 1rem;
  color: var(--text);
  font-weight: 700;
  user-select: none;
}

.dataset-text-card summary::-webkit-details-marker {
  display: none;
}

.dataset-text-card summary::after {
  content: "+";
  float: right;
  color: var(--muted);
  font-weight: 700;
}

.dataset-text-card[open] summary {
  border-bottom: 1px solid var(--line);
}

.dataset-text-card[open] summary::after {
  content: "-";
}

.dataset-text-card p {
  margin: 0;
  padding: 12px 14px 14px;
  color: var(--muted);
  line-height: 1.7;
}

.anno-rules {
  padding: 0 14px 10px;
}

.anno-rules h4 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--text);
}

.anno-rules ol {
  margin: 0;
  padding-left: 1.3rem;
  color: var(--muted);
}

.anno-rules li + li {
  margin-top: 6px;
}

.anno-table-wrap {
  margin: 0 14px 14px;
  overflow-x: auto;
}

.anno-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--line);
}

.anno-table caption {
  caption-side: top;
  text-align: left;
  padding: 10px 12px 8px;
  font-weight: 700;
  color: var(--text);
}

.anno-table th,
.anno-table td {
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  border-bottom: none;
  vertical-align: top;
  text-align: left;
}

.anno-table th {
  background: #f7f9fe;
  font-size: 0.95rem;
}

.anno-cell-list {
  display: grid;
  gap: 2px;
}

.anno-table tbody tr:hover {
  background: transparent;
}

.pose-anno-table {
  table-layout: fixed;
}

.pose-anno-table th:nth-child(3),
.pose-anno-table td:nth-child(3) {
  width: 35%;
  line-height: 1.5;
}

.pose-anno-table caption {
  text-align: center;
}

.behavior-anno-table {
  table-layout: fixed;
}

.behavior-anno-table th:nth-child(2),
.behavior-anno-table td:nth-child(2) {
  width: 80%;
}

.behavior-anno-table caption {
  text-align: center;
}


.resource-card {
  transition: 0.2s ease;
}

.resource-card:hover {
  border-color: rgba(38, 93, 255, 0.45);
  transform: translateY(-2px);
}

.code-block-wrap {
  margin-top: 24px;
  background: #0f1727;
  color: #d8e0ef;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-title {
  padding: 12px 16px;
  background: #162036;
  color: #f7fbff;
  font-weight: 700;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

pre {
  margin: 0;
  padding: 18px;
  overflow-x: auto;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.95rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.task-gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.examples-media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.example-media-item {
  margin: 0;
  display: flex;
  flex-direction: column-reverse;
}

.example-media-item.example-wide {
  grid-column: 1 / -1;
}

.example-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  object-fit: contain;
  background: transparent;
}

.pose-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.obj-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.ins-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.example-video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  background: #000;
}

.example-media-item figcaption {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 600;
}

.detail-gallery {
  grid-template-columns: 1fr;
  gap: 22px;
}

.detail-gallery .gallery-card {
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  max-width: 600px;
  margin: 0 auto;
}

.detail-gallery .gallery-card img {
  width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
  background: transparent;
}

.detail-gallery .gallery-card figcaption {
  padding: 10px 0 0;
}

.gallery-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.gallery-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  background: var(--surface-2);
}

.gallery-card figcaption {
  padding: 12px 14px 16px;
  color: var(--muted);
  font-weight: 700;
}

.table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  background: #f7f9fe;
  font-size: 0.95rem;
}

tbody tr:hover {
  background: #fafcff;
}

.copy-status {
  display: inline-block;
  margin-left: 12px;
  color: var(--accent);
  font-weight: 700;
}

.ethics-section {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding: 28px 0 22px;
}

.ethics-section h2 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.ethics-section p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-wrap {
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

@media (max-width: 1120px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .benchmark-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .menu-toggle {
    display: none;
  }

  .nav {
    position: static;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: 0;
    box-shadow: none;
  }

  .hero-grid,
  .two-col,
  .info-grid,
  .resource-grid,
  .gallery-grid,
  .task-gallery-grid,
  .examples-media-grid {
    grid-template-columns: 1fr;
  }

  .dataset-text-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .section {
    padding: 72px 0;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .dataset-photo-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .author-name {
    font-size: 1.1rem;
  }

  .footer-wrap {
    flex-direction: column;
    justify-content: center;
    text-align: center;
    padding: 18px 0;
  }
}

@media (max-width: 420px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .brand-text {
    font-size: 0.96rem;
  }
}


.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(34, 168, 123, 0.1);
  color: #177958;
  font-weight: 700;
  font-size: 0.92rem;
  border: 1px solid rgba(34, 168, 123, 0.15);
}

.benchmark-stack {
  display: grid;
  gap: 22px;
  margin-top: 26px;
}

.benchmark-notes {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.benchmark-section h3 {
  margin: 0 0 12px;
  font-size: 1.2rem;
}

.benchmark-footnote {
  margin-top: 14px;
  font-size: 0.92rem;
}

tbody tr strong {
  color: var(--primary-2);
}

@media (max-width: 920px) {
  .hero-highlights {
    margin-bottom: 20px;
  }
}