:root {
  --primary: #4a6cf7;
  --primary-dark: #3451b2;
  --accent: #e74c3c;
  --bg-light: #f8f9fc;
  --bg-white: #ffffff;
  --text-dark: #1a1a2e;
  --text-body: #4a4a6a;
  --text-muted: #8888a8;
  --border: #e8e8f0;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 20px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Noto Sans', 'Google Sans', system-ui, sans-serif;
  color: var(--text-body);
  background: var(--bg-light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.container.wide {
  max-width: 1400px;
}

/* Hero */
.hero-section {
  background: linear-gradient(135deg, #f0f2ff 0%, #fafbff 50%, #f5f0ff 100%);
  padding: 80px 0 48px;
  text-align: center;
}

.publication-title {
  font-family: 'Google Sans', 'Noto Sans', sans-serif;
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.2;
  margin-bottom: 8px;
}

.publication-title .highlight {
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.conference-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0;
}

.conference-badge .venue {
  background: var(--text-dark);
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.conference-badge .status {
  background: var(--accent);
  color: #fff;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.authors-list {
  margin: 20px 0 6px;
  font-size: 1.05rem;
}

.authors-names {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25em 2.5em;
}

.authors-list a {
  color: inherit;
  text-decoration: none;
}

.authors-list a:hover {
  text-decoration: underline;
}

.authors-affiliation {
  margin-top: 6px;
}

.authors-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.affiliations {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.link-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 24px 0 8px;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 2px solid var(--border);
  color: var(--text-dark);
  background: var(--bg-white);
}

.link-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.link-btn.primary {
  background: var(--text-dark);
  color: #fff;
  border-color: var(--text-dark);
}

.link-btn.primary:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.link-btn svg {
  width: 18px;
  height: 18px;
}

.tldr-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  margin: 28px auto 0;
  max-width: 900px;
  font-size: 0.95rem;
  color: var(--text-body);
  box-shadow: var(--shadow-sm);
}

.tldr-card strong {
  color: var(--primary);
}

/* Sections */
.content-section {
  padding: 56px 0;
}

.content-section:nth-child(odd) {
  background: var(--bg-white);
}

.content-section:nth-child(even) {
  background: var(--bg-light);
}

.section-title {
  font-family: 'Google Sans', sans-serif;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 24px;
  text-align: center;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: -16px;
  margin-bottom: 28px;
}

.abstract-text {
  font-size: 1.02rem;
  line-height: 1.8;
  max-width: 1000px;
  margin: 0 auto;
  text-align: justify;
}

.method-name {
  font-weight: 700;
  color: var(--primary);
}

/* Method Figure */
.method-figure {
  margin: 32px auto;
  max-width: 100%;
  text-align: center;
}

.method-figure img {
  max-width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}

.method-figure .caption {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

/* Point Cloud Viewer */
.viewer-section {
  background: var(--bg-white);
  padding: 56px 0;
}

.viewer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 28px 0;
}

.viewer-card {
  background: var(--bg-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: box-shadow 0.3s ease;
}

.viewer-card:hover {
  box-shadow: var(--shadow-md);
}

.viewer-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 320px;
  background: #fafafa;
}

.viewer-canvas-wrapper canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.viewer-label {
  padding: 12px 16px;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-dark);
  background: var(--bg-white);
  border-top: 1px solid var(--border);
}

.viewer-controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 20px 0;
  flex-wrap: wrap;
}

.viewer-controls button {
  padding: 8px 20px;
  border-radius: 50px;
  border: 2px solid var(--border);
  background: var(--bg-white);
  color: var(--text-dark);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.viewer-controls button:hover,
.viewer-controls button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Full-width single viewer */
.viewer-full {
  position: relative;
  width: 100%;
  height: 450px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fafafa;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  margin: 20px 0;
}

.viewer-full canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.viewer-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
  font-style: italic;
}

/* Loading spinner */
.viewer-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Results Table */
.results-table-wrapper {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--bg-white);
}

.results-table thead th {
  background: var(--text-dark);
  color: #fff;
  padding: 12px 16px;
  text-align: center;
  font-weight: 600;
  white-space: nowrap;
}

.results-table tbody td {
  padding: 10px 16px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.results-table tbody tr:hover {
  background: #f5f6ff;
}

.results-table .best {
  font-weight: 700;
  color: var(--accent);
}

.results-table .second {
  font-weight: 600;
  color: var(--primary);
  text-decoration: underline;
}

.results-table .method-col {
  text-align: left;
  font-weight: 600;
  color: var(--text-dark);
}

.results-table .ours {
  background: #f0f2ff;
}

/* Qualitative Comparison */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 28px 0;
}

.comparison-col-label {
  text-align: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-dark);
  padding: 8px 0;
}

.comparison-viewer {
  position: relative;
  width: 100%;
  height: 240px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fafafa;
  border: 1px solid var(--border);
}

.comparison-viewer canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* Key Findings */
.findings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.finding-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.finding-card .metric {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.finding-card .metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.finding-card .metric-desc {
  font-size: 0.9rem;
  color: var(--text-body);
}

/* TORA vs. RPF comparison */
.rpf-comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 28px;
}

.rpf-comparison-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.rpf-comparison-card.dataset-tab {
  cursor: pointer;
  transition: box-shadow 0.2s, border-color 0.2s, background 0.2s;
}

.rpf-comparison-card.dataset-tab:hover {
  box-shadow: var(--shadow-md);
}

.rpf-comparison-card.dataset-tab.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(74, 108, 247, 0.25);
  background: linear-gradient(135deg, rgba(74, 108, 247, 0.06) 0%, rgba(74, 108, 247, 0.02) 100%);
}

.dataset-examples-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-top: 40px;
  margin-bottom: 0;
}

.dataset-example-panels {
  position: relative;
}

.dataset-example-panel {
  display: none;
}

.dataset-example-panel.active {
  display: block;
}

.sample-buttons {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.sample-btn {
  padding: 6px 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-white);
  color: var(--text-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 36px;
}

.sample-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.sample-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.rpf-comparison-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 2px;
}

.rpf-comparison-card-title .card-kw {
  color: var(--primary);
  font-weight: 800;
}

.rpf-comparison-card-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.comparison-metric {
  margin-bottom: 14px;
}

.comparison-metric:last-child {
  margin-bottom: 0;
}

.comparison-metric-name {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.comparison-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
  font-size: 0.85rem;
}

.comparison-row.ours .comparison-val {
  font-weight: 700;
  color: var(--primary);
}

.comparison-label-ours {
  color: var(--primary);
  font-weight: 700;
}

.comparison-label {
  flex: 0 0 72px;
  color: var(--text-body);
}

.comparison-bar-wrap {
  flex: 1;
  min-width: 0;
  height: 10px;
  background: var(--border);
  border-radius: 5px;
  overflow: hidden;
}

.comparison-bar {
  height: 100%;
  border-radius: 5px;
  transition: width 0.3s ease;
}

.comparison-bar.rpf {
  background: #cbd5e1;
}

.comparison-bar.tora {
  background: var(--primary);
}

.comparison-bar-wrap.inv {
  display: flex;
  justify-content: flex-end;
}

.comparison-bar-wrap.inv .comparison-bar {
  margin-left: 0;
  margin-right: 0;
}

.comparison-val-wrap {
  flex: 0 0 56px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
}

.comparison-val {
  font-variant-numeric: tabular-nums;
}

.comparison-row > .comparison-val {
  flex: 0 0 56px;
  text-align: right;
}

.comparison-improve {
  font-size: 0.7rem;
  font-weight: 600;
  color: #16a34a;
}

/* BibTeX */
.bibtex-wrapper {
  position: relative;
  background: var(--text-dark);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 24px auto;
  max-width: 960px;
}

.bibtex-code {
  padding: 20px 24px;
  color: #e8e8f0;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: #fff;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover {
  background: rgba(255,255,255,0.2);
}

/* Footer */
.footer-section {
  padding: 32px 0;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--bg-light);
  border-top: 1px solid var(--border);
}

.footer-section a {
  color: var(--primary);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
  .publication-title {
    font-size: 1.8rem;
  }
  .hero-section {
    padding: 48px 0 32px;
  }
  .comparison-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .viewer-full {
    height: 320px;
  }
  .viewer-canvas-wrapper {
    height: 260px;
  }
  .container {
    padding: 0 16px;
  }
}

@media (max-width: 480px) {
  .publication-title {
    font-size: 1.5rem;
  }
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

/* Animation for teaser */
.assembly-animation-container {
  position: relative;
  width: 100%;
  height: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fafafa;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  margin: 24px 0;
}

.assembly-animation-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* Assembly slider */
.slider-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin: 16px 0;
}

.slider-container label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dark);
  white-space: nowrap;
}

.slider-container input[type="range"] {
  width: 300px;
  accent-color: var(--primary);
}

.slider-container .slider-val {
  font-family: 'SF Mono', monospace;
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 600;
  min-width: 40px;
}

/* Category buttons */
.category-buttons {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 20px 0 8px;
  flex-wrap: wrap;
}

.cat-btn {
  padding: 8px 24px;
  border-radius: 50px;
  border: 2px solid var(--border);
  background: var(--bg-white);
  color: var(--text-dark);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.cat-btn:hover,
.cat-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* Math display */
.math-block {
  text-align: center;
  margin: 16px 0;
  font-size: 1rem;
}