/* ============================================================
   3D HAMSTER — Project Page Styles
   Aesthetic: Precision Science
   Palette: off-white bg, steel-blue accent, warm ink text
   ============================================================ */

/* ---------- Fonts ---------- */
/* Matches MapAnything: Google Sans | Noto Sans | Castoro */

/* ---------- Design Tokens ---------- */
:root {
  /* Brand */
  --brand:          #2563a8;
  --brand-mid:      #3b7ec8;
  --brand-light:    #5b9bd5;
  --brand-pale:     #dceeff;
  --brand-pale2:    #eef5fd;

  /* Text */
  --ink:            #1a1e26;
  --ink-mid:        #3d4451;
  --ink-muted:      #6b7280;
  --ink-faint:      #9ca3af;

  /* Surface */
  --bg:             #f7f8fa;
  --surface:        #ffffff;
  --surface-alt:    #f2f5f9;
  --border:         #e2e8f0;
  --border-mid:     #cbd5e1;

  /* Highlight */
  --ours-bg:        #eaf3fc;
  --ours-bg-hover:  #d9ebf9;
  --best-color:     #1a56a0;

  /* Shadow */
  --shadow-sm:      0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md:      0 4px 12px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.05);
  --shadow-lg:      0 12px 32px rgba(0,0,0,.10), 0 4px 12px rgba(0,0,0,.06);
  --shadow-video:   0 8px 24px rgba(0,0,0,.14), 0 3px 8px rgba(0,0,0,.09);

  /* Radius */
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      16px;
  --radius-xl:      22px;

  /* Spacing rhythm */
  --section-gap:    5rem;
}

/* ---------- Base Reset ---------- */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Google Sans', sans-serif;
  color: var(--ink);
  letter-spacing: -0.01em;
}

p {
  color: var(--ink-mid);
}

code, pre {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
}

/* ---------- Links ---------- */
a:not(.button):not(.external-link):not([class*="button"]) {
  color: var(--brand-mid) !important;
  font-weight: 500 !important;
  text-decoration: none;
  transition: color 0.2s ease;
}
a:not(.button):not(.external-link):not([class*="button"]):hover {
  color: var(--brand) !important;
}

.author-block a,
.content a:not(.button):not(.external-link) {
  color: var(--brand-mid) !important;
  font-weight: 500 !important;
  text-decoration: none;
}
.author-block a:hover,
.content a:not(.button):not(.external-link):hover {
  color: var(--brand) !important;
}

sup {
  font-size: 0.7em !important;
  vertical-align: super;
}

/* ---------- Sections ---------- */
.section {
  padding: 4rem 1.5rem;
  position: relative;
}

/* Soft, center-anchored divider between major sections (replaces hard border-top) */
.section + .section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(60%, 640px);
  height: 1px;
  background: linear-gradient(90deg,
    rgba(203, 213, 225, 0) 0%,
    rgba(203, 213, 225, 0.9) 50%,
    rgba(203, 213, 225, 0) 100%);
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(165deg, #0e1b30 0%, #132545 40%, #1c3a68 70%, #1e3e70 100%);
  position: relative;
  overflow: hidden;
  padding-bottom: 3rem;
}

/* Subtle geometric texture overlay */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(91,155,213,.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(37,99,168,.15) 0%, transparent 50%),
    radial-gradient(circle at 60% 80%, rgba(30,62,112,.20) 0%, transparent 40%);
  pointer-events: none;
}

/* Grid dot pattern */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.hero .hero-body {
  position: relative;
  z-index: 1;
  padding: 4.5rem 1.5rem 2rem;
}

/* Venue badge */
.venue-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.18);
  backdrop-filter: blur(8px);
  color: rgba(255,255,255,.88);
  font-family: 'Google Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 1rem;
  border-radius: 99px;
  margin-bottom: 1.6rem;
}

.venue-badge .venue-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #60a5fa;
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.55; transform: scale(0.8); }
}

.publication-title {
  font-family: 'Google Sans', sans-serif !important;
  font-weight: 700 !important;
  font-size: 2rem !important;
  line-height: 1.25 !important;
  color: #ffffff !important;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 16px rgba(0,0,0,.3);
  margin-bottom: 1.4rem !important;
}

.publication-authors {
  font-family: 'Google Sans', sans-serif;
  font-size: 1rem;
  color: rgba(255,255,255,.75);
  margin-bottom: 0.3rem;
}

/* Publication link buttons */
.publication-links {
  margin-top: 1.8rem;
}

.publication-links .external-link.button {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: 99px !important;
  padding: 0.5rem 1.3rem;
  transition: all 0.22s ease;
  border: 1.5px solid rgba(255,255,255,.25) !important;
  background: rgba(255,255,255,.10) !important;
  color: rgba(255,255,255,.92) !important;
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

.publication-links .external-link.button:hover {
  background: rgba(255,255,255,.20) !important;
  border-color: rgba(255,255,255,.45) !important;
  color: #ffffff !important;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0,0,0,.22);
}

/* ---------- TL;DR Section ---------- */
.tldr-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.1rem 1.4rem;
  box-shadow: var(--shadow-sm);
  font-size: 0.97rem;
  line-height: 1.65;
  color: var(--ink-mid);
}

.tldr-box strong:first-child {
  color: var(--brand);
  font-weight: 700;
}

/* ---------- Section Titles ---------- */
.section-title {
  font-family: 'Google Sans', sans-serif !important;
  font-weight: 700 !important;
  font-size: 1.85rem !important;
  letter-spacing: -0.015em;
  color: var(--ink) !important;
  margin-bottom: 0.5rem !important;
  padding-bottom: 0.6rem;
  position: relative;
}

.title.is-5 {
  font-family: 'Google Sans', sans-serif !important;
  font-size: 1.05rem !important;
  font-weight: 600 !important;
  color: var(--ink) !important;
  letter-spacing: -0.005em;
  margin-bottom: 0.6rem !important;
}

.title.is-6 {
  font-family: 'Google Sans', sans-serif !important;
  font-size: 0.95rem !important;
  font-weight: 600 !important;
  color: var(--ink-mid) !important;
}

/* ---------- Content Paragraphs ---------- */
.content p {
  font-size: 0.97rem;
  line-height: 1.72;
  color: var(--ink-mid);
}

/* ---------- Video Styling ---------- */
.result-video {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  display: block;
  background: #0e1520;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.result-video:hover {
  box-shadow: 0 14px 36px rgba(0,0,0,.18), 0 4px 12px rgba(0,0,0,.10);
  transform: translateY(-2px);
}

#teaser-video {
  max-width: 92%;
  margin: 1.5rem auto 0;
  display: block;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  background: #0e1520;
}

/* ---------- Method Figure ---------- */
.method-figure {
  width: 98%;
  margin: 1.5rem auto 0;
  display: block;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

/* ---------- Results Tables ---------- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  margin: 0.5rem 0 1.5rem;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  font-family: 'Google Sans', sans-serif;
  background: var(--surface);
}

.results-table th,
.results-table td {
  padding: 9px 13px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.results-table th:first-child,
.results-table td:first-child {
  text-align: left;
  padding-left: 16px;
}

.results-table thead tr {
  background: #f0f5fb;
}

.results-table thead tr:first-child th {
  border-bottom: 1px solid var(--border-mid);
}

.results-table th {
  font-weight: 600;
  color: var(--ink);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--brand-light);
}

.results-table thead tr:last-child th {
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
}

.results-table tbody tr:last-child td {
  border-bottom: none;
}

.results-table tbody tr:hover {
  background-color: #f8fafc;
  transition: background-color 0.15s ease;
}

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

.results-table .ours-row {
  background-color: var(--ours-bg);
}

.results-table .ours-row td {
  font-weight: 500;
}

.results-table .ours-row:hover {
  background-color: var(--ours-bg-hover);
}

.results-table .section-header td {
  background: linear-gradient(90deg, #eef3f9 0%, #f5f8fc 100%);
  font-style: normal;
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand);
  padding-top: 10px;
  padding-bottom: 10px;
  border-top: 1px solid var(--border-mid);
}
.results-table tfoot td {
  font-weight: 700;
  font-size: 0.84rem;
  background: var(--surface-alt);
  border-top: 2px solid var(--border-mid);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-mid);
}
.results-table tfoot td:last-child {
  color: var(--best-color);
  text-transform: none;
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
}

/* ---------- Comparison Grid ---------- */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin: 1.2rem 0;
}

.comparison-item {
  text-align: center;
}

.comparison-item video {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  display: block;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.comparison-item video:hover {
  box-shadow: 0 14px 36px rgba(0,0,0,.18);
  transform: translateY(-2px);
}

.comparison-item .label {
  margin-top: 0.6rem;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink-mid);
  letter-spacing: 0.01em;
}

/* Color-coded labels */
.comparison-item:first-child .label {
  color: #b91c1c;
}

.comparison-item:last-child .label {
  color: #166534;
}

/* ---------- 2x2 Video Grid ---------- */
.video-grid-2x2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}

.grid-item {
  text-align: center;
}

.grid-item video {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  display: block;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.grid-item video:hover {
  box-shadow: 0 14px 36px rgba(0,0,0,.18);
  transform: translateY(-2px);
}

/* Crop wrapper — hides left 1/4 of 16:9 source by letting object-fit:cover
   fill a 4:3 frame anchored to the right edge. */
.grid-item .video-crop {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.grid-item .video-crop:hover {
  box-shadow: 0 14px 36px rgba(0,0,0,.18);
  transform: translateY(-2px);
}

.grid-item .video-crop > video {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: 100% 50%;
  border-radius: 0;
  box-shadow: none;
  transform: none;
  transition: none;
}

.grid-item .video-crop > video:hover {
  box-shadow: none;
  transform: none;
}

.method-label {
  margin-top: 0.55rem;
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--ink-mid);
  letter-spacing: 0.02em;
}

/* Highlight "ours" label in grids */
.grid-item:first-child .method-label {
  color: var(--brand);
}

/* ---------- 3D Trajectory Row ---------- */
.trajectory-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0;
}

.trajectory-row video {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  display: block;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.trajectory-row video:hover {
  box-shadow: 0 14px 36px rgba(0,0,0,.18);
  transform: translateY(-2px);
}

.trajectory-cell {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: stretch;
  min-width: 0;
}

.trajectory-prompt {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 0.45rem 0.75rem 0.5rem;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--ink-mid);
  font-style: italic;
  text-align: center;
}

.trajectory-prompt::before {
  content: "Prompt";
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-pale);
  border: 1px solid var(--brand-light);
  border-radius: 99px;
  padding: 0.1rem 0.5rem;
  margin-right: 0.45rem;
  vertical-align: 0.1em;
  font-style: normal;
}

/* ---------- BibTeX ---------- */
.bibtex-container {
  position: relative;
  margin-top: 0.5rem;
}

.bibtex-container pre {
  background: #f0f5f9;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.4rem 1.4rem 1.6rem;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--ink-mid);
  box-shadow: var(--shadow-sm);
}

.bibtex-container code {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
}

.copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--surface);
  border: 1px solid var(--border-mid);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  cursor: pointer;
  font-size: 0.82rem;
  font-family: 'Google Sans', sans-serif;
  font-weight: 500;
  color: var(--ink-muted);
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.copy-button:hover {
  background: var(--brand-pale);
  border-color: var(--brand-light);
  color: var(--brand);
}

.copy-button.copied {
  background: var(--brand);
  color: white;
  border-color: var(--brand);
}

.copy-feedback {
  position: absolute;
  top: -30px;
  right: 10px;
  background: var(--ink);
  color: white;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: 'Google Sans', sans-serif;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.copy-feedback.show {
  opacity: 1;
}

/* ---------- Footer ---------- */
footer.footer {
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.5rem;
}

footer.footer .content p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

footer.footer a {
  color: var(--brand-mid) !important;
  font-weight: 500 !important;
}

/* ---------- Scroll-reveal (IntersectionObserver-driven, one-shot) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Highlight box ---------- */
.highlight-box {
  background: linear-gradient(135deg, var(--brand-pale2) 0%, var(--brand-pale) 100%);
  border-left: 4px solid var(--brand);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1rem 0;
  box-shadow: var(--shadow-sm);
}

/* ---------- Interactive 3D Point Cloud Viewers ---------- */
.pcd-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 0.8rem 0 1.8rem;
}

.pcd-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.1rem;
  margin: 0.8rem 0 1.8rem;
}

.pcd-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}

.pcd-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.pcd-iframe {
  width: 100%;
  height: 340px;
  border: 0;
  display: block;
  background: var(--bg);
}

.pcd-iframe--tall {
  height: 440px;
}

.pcd-caption {
  padding: 0.6rem 0.9rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--ink-mid);
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
  font-family: 'Google Sans', sans-serif;
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root {
    --section-gap: 3rem;
  }

  .publication-title {
    font-size: 1.7rem !important;
  }

  .comparison-grid,
  .video-grid-2x2 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .trajectory-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .pcd-grid-3,
  .pcd-grid-2 {
    grid-template-columns: 1fr;
  }

  .pcd-iframe,
  .pcd-iframe--tall {
    height: 360px;
  }

  #teaser-video {
    max-width: 100%;
  }

  .section-title {
    font-size: 1.55rem !important;
  }

  .results-table th,
  .results-table td {
    padding: 7px 9px;
    font-size: 0.8rem;
  }

  .hero .hero-body {
    padding: 3rem 1rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .publication-title {
    font-size: 1.45rem !important;
  }

  .publication-links .external-link.button {
    font-size: 0.78rem;
    padding: 0.45rem 1rem;
  }
}

/* ---------- Bulma overrides ---------- */
.container.is-max-desktop {
  max-width: 900px;
}

.columns.is-centered > .column {
  padding: 0 1rem;
}

/* ---------- Utility ---------- */
.has-text-brand {
  color: var(--brand) !important;
}

/* ============================================================
   New styles — sticky TOC, captions, contributions, disabled
   buttons, native <pcd-viewer>, table scroll-hint.
   ============================================================ */

/* ---------- Sticky sub-nav ---------- */
.page-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(247, 248, 250, 0.88);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--border);
  animation: none;
}

.page-nav__inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.55rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  justify-content: center;
}
.page-nav__inner::-webkit-scrollbar { display: none; }

.page-nav a {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-mid) !important;
  padding: 0.4rem 0.9rem;
  border-radius: 99px;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.page-nav a:hover {
  background-color: var(--brand-pale2);
  color: var(--brand) !important;
}

.page-nav a.is-active {
  background-color: var(--brand-pale);
  color: var(--brand) !important;
  font-weight: 600;
}

@media (max-width: 640px) {
  .page-nav__inner { justify-content: flex-start; }
  .page-nav a { font-size: 0.78rem; padding: 0.35rem 0.75rem; }
}

/* ---------- Section number glyph ---------- */
.section-title[data-section-num]::before {
  content: attr(data-section-num) ' · ';
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-weight: 500;
  font-size: 0.7em;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  margin-right: 0.15em;
}

/* ---------- Figure / Table captions ---------- */
.figure-block {
  margin: 1.2rem 0 0.4rem !important;
}

.figure-caption,
.table-caption {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--ink-muted);
  text-align: center;
  margin: 0.7rem auto 0;
  max-width: 820px;
  padding: 0 0.5rem;
}

.figure-caption strong,
.table-caption strong {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.table-caption {
  margin: 0 auto 0.6rem;
}

.table-caption .best-legend {
  display: inline-block;
  background: var(--ours-bg);
  color: var(--best-color);
  font-weight: 700;
  padding: 0.05rem 0.45rem;
  border-radius: 4px;
  font-size: 0.78rem;
}

/* Subtask heading inside the merged qualitative section */
.subtask-title {
  font-family: 'Google Sans', sans-serif;
  font-weight: 500;
  font-size: 0.92rem;
  color: var(--ink-mid);
  text-align: center;
  letter-spacing: 0.01em;
  margin: 1.6rem auto 0.8rem;
  display: block;
}

/* Prompt-style boxed presentation for instruction strings */
.subtask-title::before {
  content: "Prompt";
  display: inline-block;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-pale);
  border: 1px solid var(--brand-light);
  border-radius: 99px;
  padding: 0.15rem 0.6rem;
  margin-right: 0.55rem;
  vertical-align: 0.06em;
}

.subtask-title {
  /* Wrap the quoted text in a card */
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 0.55rem 1rem 0.6rem;
  max-width: 720px;
  font-style: italic;
}

/* ---------- Shared legend block (above 3D trajectory subsections) ---------- */
.legend-block {
  margin: 1rem auto 1.6rem;
  max-width: 440px;
  padding: 0.7rem 1rem 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

/* Pin the trajectory legend to viewport while scrolling through the section */
#trajectories .legend-block {
  position: sticky;
  top: 56px; /* clear the sticky page-nav */
  z-index: 5;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
}

.legend-block img {
  max-width: 100%;
  width: 360px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.legend-caption {
  margin-top: 0.4rem;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--ink-muted);
}

/* ---------- Viewer subgroup heading (h4 inside merged trajectory section) ---------- */
.viewer-subgroup-title {
  font-family: 'Google Sans', sans-serif !important;
  font-weight: 600 !important;
  font-size: 0.88rem !important;
  color: var(--ink-mid) !important;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.7rem !important;
  padding-left: 0.6rem;
  border-left: 3px solid var(--brand-light);
}

/* ---------- <kbd> hints (arrow-key indicators) ---------- */
kbd {
  display: inline-block;
  min-width: 1.2em;
  padding: 0 0.4em;
  background: var(--surface);
  border: 1px solid var(--border-mid);
  border-bottom-width: 2px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.85em;
  font-weight: 600;
  color: var(--ink-mid);
  line-height: 1.4;
  text-align: center;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}

/* ---------- Scene carousel (stacked full-width: DROID + Real-World) ---------- */
.pcd-carousel-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem;
  margin: 1.2rem 0 1.8rem;
}

@media (max-width: 900px) {
  .pcd-carousel-row {
    grid-template-columns: 1fr;
  }
}

.pcd-carousel {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.pcd-carousel:focus,
.pcd-carousel.is-focused {
  border-color: var(--brand-light);
  box-shadow: 0 0 0 3px rgba(37, 99, 168, 0.18), var(--shadow-md);
}

.pcd-carousel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.9rem 0.5rem;
  border-bottom: 1px solid var(--border);
  font-family: 'Google Sans', sans-serif;
}

.pcd-carousel__group {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-mid);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pcd-carousel__counter {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
  background: var(--surface-alt);
  padding: 0.15rem 0.55rem;
  border-radius: 99px;
  border: 1px solid var(--border);
}

.pcd-carousel > pcd-viewer {
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}

.pcd-carousel > pcd-viewer:hover {
  box-shadow: none;
  transform: none;
}

/* Hide the viewer's own caption bar when inside a carousel
   (carousel's own caption in the nav bar is the source of truth) */
.pcd-carousel > pcd-viewer > .pcd-viewer__caption {
  display: none;
}

.pcd-carousel__nav {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.7rem;
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
}

.pcd-carousel__btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border-mid);
  background: var(--surface);
  color: var(--brand);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.pcd-carousel__btn:hover {
  background: var(--brand-pale);
  border-color: var(--brand-light);
}

.pcd-carousel__btn:active {
  transform: scale(0.94);
}

.pcd-carousel__btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.pcd-carousel__cap {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--ink-mid);
  text-align: center;
  min-height: 2.4em;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0.3rem;
}

.pcd-carousel__dots {
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.4rem 0.5rem 0.55rem;
  border-top: 1px solid var(--border);
}

.pcd-carousel__dot {
  width: 9px;
  height: 9px;
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--border-mid);
  background: var(--surface);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.pcd-carousel__dot:hover {
  border-color: var(--brand-light);
}

.pcd-carousel__dot.is-active {
  background: var(--brand);
  border-color: var(--brand);
  transform: scale(1.12);
}

.pcd-carousel__hint {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.72rem;
  color: var(--ink-faint);
  text-align: center;
  padding: 0 0.7rem 0.55rem;
  letter-spacing: 0.01em;
}

.pcd-carousel__hint i {
  margin-right: 0.25rem;
  opacity: 0.8;
}

.pcd-carousel__hint kbd {
  font-size: 0.7rem;
  padding: 0 0.3em;
}

/* Mobile: tighten spacing, shrink viewer height */
@media (max-width: 768px) {
  .pcd-carousel-row {
    gap: 1.2rem;
  }
  .pcd-carousel > pcd-viewer.is-tall .pcd-viewer__canvas {
    height: 360px;
  }
}

/* ---------- Key Contributions box ---------- */
.contributions-box {
  background: linear-gradient(135deg, var(--brand-pale2) 0%, var(--brand-pale) 100%);
  border-left: 4px solid var(--brand);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.1rem 1.4rem 1rem;
  margin-top: 1.6rem;
  box-shadow: var(--shadow-sm);
}

.contributions-title {
  font-family: 'Google Sans', sans-serif;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 0.6rem;
}

.contributions-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--ink-mid);
}

.contributions-list li {
  font-size: 0.96rem;
  line-height: 1.65;
  margin: 0.35rem 0;
}

.contributions-list li strong {
  color: var(--ink);
  font-weight: 600;
}

.contributions-list li::marker {
  color: var(--brand);
  font-weight: 700;
}

/* ---------- Method "we build (1)/(2)" list ---------- */
.method-build-list {
  list-style: none;
  counter-reset: build;
  margin: 0.6rem 0 0.4rem 0;
  padding-left: 0;
}

.method-build-list li {
  position: relative;
  counter-increment: build;
  padding: 0.45rem 0 0.45rem 2.6rem;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--ink-mid);
}

.method-build-list li::before {
  content: "(" counter(build) ")";
  position: absolute;
  left: 0.4rem;
  top: 0.45rem;
  color: var(--brand);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.method-build-list li strong {
  color: var(--ink);
  font-weight: 600;
}

.method-build-list li + li {
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
}

/* ---------- Disabled placeholder buttons ---------- */
.publication-links .external-link.is-disabled {
  opacity: 0.55;
  pointer-events: none;
  cursor: default;
  background: rgba(255, 255, 255, 0.06) !important;
  border-color: rgba(255, 255, 255, 0.18) !important;
  box-shadow: none !important;
}

.publication-links .soon-pill {
  margin-left: 0.5rem;
  padding: 0.05rem 0.45rem;
  border-radius: 99px;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.88);
}

/* ---------- Table horizontal-scroll fade hint (mobile) ---------- */
.table-wrapper {
  position: relative;
}

.table-wrapper::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 36px;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0.85) 100%);
  opacity: 0;
  transition: opacity 0.2s ease;
}

@media (max-width: 768px) {
  .table-wrapper::after { opacity: 1; }
}

/* ---------- <pcd-viewer> custom element ---------- */
pcd-viewer {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}

pcd-viewer:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.pcd-viewer__canvas {
  position: relative;
  width: 100%;
  height: 340px;
  background: var(--bg);
  touch-action: none;
}

pcd-viewer.is-tall .pcd-viewer__canvas {
  height: 440px;
}

/* Carousel-owned viewers — sized for the side-by-side desktop layout */
.pcd-carousel > pcd-viewer.is-tall .pcd-viewer__canvas {
  height: 320px;
}

@media (max-width: 900px) and (min-width: 769px) {
  .pcd-carousel > pcd-viewer.is-tall .pcd-viewer__canvas {
    height: 360px;
  }
}

.pcd-viewer__gl {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.pcd-viewer__shimmer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
  justify-content: center;
  background: linear-gradient(110deg,
    #f2f5f9 0%,
    #f7f8fa 45%,
    #eef3f9 55%,
    #f2f5f9 100%);
  background-size: 220% 100%;
  animation: pcd-shimmer 1.8s ease-in-out infinite;
  color: var(--ink-muted);
  font-family: 'Google Sans', sans-serif;
  font-size: 0.85rem;
  z-index: 2;
}

@keyframes pcd-shimmer {
  0%   { background-position: 100% 0; }
  100% { background-position: -100% 0; }
}

.pcd-viewer__spinner {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(37, 99, 168, 0.18);
  border-top-color: var(--brand);
  animation: pcd-spin 0.9s linear infinite;
}

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

.pcd-viewer__status {
  letter-spacing: 0.02em;
}

.pcd-viewer__error {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: center;
  color: #b91c1c;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.9rem;
}

.pcd-viewer__error-detail {
  font-size: 0.78rem;
  color: var(--ink-muted);
  max-width: 80%;
  text-align: center;
  word-break: break-word;
}

.pcd-viewer__retry {
  background: var(--surface);
  border: 1px solid var(--border-mid);
  color: var(--brand);
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  font-size: 0.82rem;
  padding: 0.35rem 0.9rem;
  border-radius: 99px;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.pcd-viewer__retry:hover {
  background: var(--brand-pale);
  border-color: var(--brand-light);
}

.pcd-viewer__caption {
  padding: 0.6rem 0.9rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--ink-mid);
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
  font-family: 'Google Sans', sans-serif;
  text-align: center;
}

@media (max-width: 768px) {
  .pcd-viewer__canvas,
  pcd-viewer.is-tall .pcd-viewer__canvas {
    height: 340px;
  }
}

/* ============================================================
   Section eyebrow, outcome chips, ours/base label coloring
   (appended; no existing rules modified)
   ============================================================ */

/* ---------- Section eyebrow (small-caps mono subtitle above each h2) ---------- */
.section-label {
  display: none;
}
.section-label::before {
  display: none;
}

/* ---------- Outcome chips on comparison-item videos ---------- */
.comparison-item {
  position: relative;
}
.comparison-item .outcome,
.video-crop .outcome {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #fff;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  z-index: 2;
  pointer-events: none;
}
.comparison-item .outcome-success,
.video-crop .outcome-success {
  background: rgba(22, 101, 52, 0.92);
}
.comparison-item .outcome-fail,
.video-crop .outcome-fail {
  background: rgba(185, 28, 28, 0.92);
}

/* ---------- Ours vs baseline label coloring ---------- */
/* Override positional rules in the comparison-grid (specificity 0,3,0 ties existing; placed later so wins). */
.comparison-item .label.label-ours {
  color: var(--brand);
}
.comparison-item .label.label-base {
  color: var(--ink-mid);
}

/* video-grid-2x2: existing .grid-item:first-child rule colors the first cell brand-blue —
   disable that positional rule by relying on explicit classes instead. */
.grid-item .method-label.label-ours {
  color: var(--brand);
}
.grid-item .method-label.label-base {
  color: var(--ink-mid);
}

@media (max-width: 480px) {
  .comparison-item .outcome,
  .video-crop .outcome {
    font-size: 0.6rem;
    padding: 0.18rem 0.5rem;
    top: 0.5rem;
    right: 0.5rem;
  }
  .section-label {
    font-size: 0.66rem;
    letter-spacing: 0.14em;
  }
}

/* ============================================================
   Overview equation  (Planner + Policy = Robust Manipulation)
   ============================================================ */
.overview-eq {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 0.9rem;
  margin: 2rem auto 0.4rem;
  max-width: 860px;
}

.overview-eq__panel {
  flex: 1 1 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 1.1rem 1rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: box-shadow 0.22s ease, transform 0.22s ease;
}

.overview-eq__panel:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.overview-eq__panel--result {
  background: linear-gradient(135deg, var(--brand-pale2) 0%, var(--brand-pale) 100%);
  border-color: var(--brand-light);
}

.overview-eq__icon {
  font-size: 1.4rem;
  color: var(--brand);
  margin-bottom: 0.1rem;
}

.overview-eq__title {
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.25;
}

.overview-eq__desc {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--ink-muted);
}

.overview-eq__op {
  display: flex;
  align-items: center;
  font-family: 'Google Sans', sans-serif;
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--ink-faint);
  flex: 0 0 auto;
}

.overview-eq__tagline {
  text-align: center;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--ink-muted);
  margin: 0.9rem auto 0;
  max-width: 720px;
}

@media (max-width: 720px) {
  .overview-eq {
    flex-direction: column;
    gap: 0.6rem;
    max-width: 440px;
  }
  .overview-eq__op {
    justify-content: center;
    transform: rotate(90deg);
    font-size: 1.3rem;
  }
}

/* ============================================================
   Real-robot gallery  (family tabs + condition row + focus panel)
   ============================================================ */
.rr-gallery {
  margin: 1.4rem 0 1.2rem;
}

/* ---- family tabs ---- */
.rr-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

.rr-tab {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink-mid);
  background: var(--surface);
  border: 1px solid var(--border-mid);
  border-radius: 99px;
  padding: 0.45rem 1.15rem;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.12s ease;
}

.rr-tab:hover {
  background: var(--brand-pale2);
  border-color: var(--brand-light);
  color: var(--brand);
}

.rr-tab.is-active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.rr-tab:active { transform: scale(0.97); }

/* ---- condition row (5 tiles, at a glance) ---- */
.rr-conditions {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.7rem;
  margin-bottom: 1.4rem;
}

.rr-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.14s ease, border-color 0.2s ease;
}

.rr-tile:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--brand-light);
}

.rr-tile.is-active {
  border-color: var(--brand);
  box-shadow: 0 0 0 2px rgba(37, 99, 168, 0.28), var(--shadow-md);
}

.rr-tile__video {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: 100% 50%;
  display: block;
  background: #0e1520;
}

.rr-tile__label {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-mid);
  text-align: center;
  padding: 0 0.4rem 0.55rem;
}

.rr-tile.is-active .rr-tile__label { color: var(--brand); }

/* placeholder marker on tile */
.rr-tile__ph {
  position: absolute;
  top: 0.4rem;
  left: 0.4rem;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(107, 114, 128, 0.85);
  border-radius: 99px;
  padding: 0.12rem 0.45rem;
  backdrop-filter: blur(4px);
  z-index: 2;
}

/* ---- focus panel ---- */
.rr-focus {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
  align-items: start;
}

.rr-focus__media {
  position: relative;
}

.rr-focus__video {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: 100% 50%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  display: block;
  background: #0e1520;
}

.rr-focus__badge {
  position: absolute;
  top: 0.7rem;
  left: 0.7rem;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(107, 114, 128, 0.9);
  border-radius: 99px;
  padding: 0.2rem 0.6rem;
  backdrop-filter: blur(6px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
}

.rr-focus__viewer {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* Full-width prompt bar under the condition tiles */
.rr-prompt-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 0.65rem 1.1rem 0.7rem;
  margin: 0 0 1.3rem;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--ink-mid);
  font-style: italic;
  text-align: center;
}

.rr-prompt-bar::before {
  content: "Prompt";
  display: inline-block;
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-pale);
  border: 1px solid var(--brand-light);
  border-radius: 99px;
  padding: 0.12rem 0.55rem;
  margin-right: 0.55rem;
  vertical-align: 0.12em;
  font-style: normal;
}

/* The focus-panel point-cloud viewer hides its own caption bar
   (the prompt bar above the focus panel is the single source of truth). */
.rr-focus pcd-viewer > .pcd-viewer__caption {
  display: none;
}

@media (max-width: 768px) {
  .rr-conditions {
    grid-template-columns: repeat(3, 1fr);
  }
  .rr-focus {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .rr-conditions {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---- focus-panel video-synced 3D viewer (three.js canvas host) ---- */
.rr-focus__host {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  overflow: hidden;
  background: #0e1520;
  cursor: grab;
  touch-action: none;
}

.rr-focus__host:active { cursor: grabbing; }

.rr-focus__host .synced-pcd__gl {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* ---- §02 static PLY viewer host (replaces <pcd-viewer> custom element) ---- */
.pcd-carousel .pcd-host {
  position: relative;
  width: 100%;
  height: 320px;
  background: var(--bg);
  overflow: hidden;
  cursor: grab;
  touch-action: none;
}
.pcd-carousel .pcd-host:active { cursor: grabbing; }
.pcd-carousel .pcd-host .pcd-host__gl {
  display: block;
  width: 100% !important;
  height: 100% !important;
}
@media (max-width: 900px) and (min-width: 769px) {
  .pcd-carousel .pcd-host { height: 360px; }
}
@media (max-width: 768px) {
  .pcd-carousel .pcd-host { height: 360px; }
}

/* ---- focus panel: per-column header labels + 3D drag hint ---- */
.rr-focus__col {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-width: 0;
}

.rr-focus__label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.rr-focus__label i { color: var(--brand); font-size: 0.9em; }

.rr-focus__tag {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 0.1rem 0.5rem;
}

.rr-focus__tag--live {
  color: var(--brand);
  background: var(--brand-pale);
  border-color: var(--brand-light);
}

.rr-focus__viewer { position: relative; }

.rr-focus__hint {
  position: absolute;
  bottom: 0.7rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: 'Google Sans', sans-serif;
  font-size: 0.74rem;
  font-weight: 500;
  color: #fff;
  background: rgba(14, 21, 32, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 99px;
  padding: 0.3rem 0.8rem;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  pointer-events: none;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  animation: rr-hint-pulse 2.2s ease-in-out infinite;
  transition: opacity 0.35s ease;
}

.rr-focus__hint i { opacity: 0.9; animation: rr-hint-spin 3.2s linear infinite; }

.rr-focus__hint.is-hidden { opacity: 0; }

@keyframes rr-hint-pulse {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.95; }
  50%       { transform: translateX(-50%) translateY(-2px); opacity: 0.7; }
}
@keyframes rr-hint-spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .rr-focus__hint, .rr-focus__hint i { animation: none; }
}

/* ============================================================
   Overview pipeline: equation cards (row 1) + visuals (row 2)
   ============================================================ */
.overview-eq {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  column-gap: 0.9rem;
  row-gap: 1.1rem;
  align-items: start;
  max-width: 1000px;
}
.oe-c1  { grid-column: 1; grid-row: 1; }
.oe-op1 { grid-column: 2; grid-row: 1; }
.oe-c2  { grid-column: 3; grid-row: 1; }
.oe-op2 { grid-column: 4; grid-row: 1; }
.oe-c3  { grid-column: 5; grid-row: 1; }
.oe-v1  { grid-column: 1; grid-row: 2; }
.oe-v2  { grid-column: 3; grid-row: 2; }
.oe-v3  { grid-column: 5; grid-row: 2; }

.overview-eq__panel { flex: none; }          /* override old flex layout */
.overview-eq__op { align-self: center; }     /* center +/= against the card row */

.overview-eq__viz {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  min-width: 0;
}
.oe-clip {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-video);
  background: #0e1520;
  display: block;
}
.oe-cap {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  text-align: center;
  line-height: 1.3;
}
.oe-inputs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  flex-wrap: wrap;
  padding-top: 0.15rem;
  border-top: 1px dashed var(--border);
  margin-top: 0.1rem;
}
.oe-inputs figure { margin: 0; text-align: center; }
.oe-inputs img {
  width: 60px; height: 45px; object-fit: cover;
  border-radius: 4px; border: 1px solid var(--border); display: block;
}
.oe-inputs figcaption {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.54rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-muted); margin-top: 0.1rem;
}
.oe-prompt {
  font-family: 'Google Sans', sans-serif;
  font-size: 0.68rem; font-style: italic; color: var(--ink-mid);
  max-width: 150px; line-height: 1.3;
}

@media (max-width: 760px) {
  .overview-eq {
    grid-template-columns: 1fr;
    row-gap: 0.5rem;
    max-width: 420px;
  }
  .oe-c1,.oe-c2,.oe-c3,.oe-v1,.oe-v2,.oe-v3,.oe-op1,.oe-op2 {
    grid-column: 1; grid-row: auto;
  }
  .overview-eq__op { transform: rotate(90deg); justify-self: center; }
}

/* Summary Video / Overview section headings (centered, section-level) */
.ov-section-head {
  text-align: center;
  font-family: 'Google Sans', sans-serif !important;
  font-weight: 700 !important;
  font-size: 1.7rem !important;
  letter-spacing: -0.015em;
  color: var(--ink) !important;
  margin: 0 0 1.2rem !important;
}

/* ============================================================
   §02 planner flow figure: [RGB][Depth][Prompt] -> VLM -> 3D trajectory
   ============================================================ */
.vlm-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin: 1rem auto 1.6rem;
  max-width: 920px;
}
.vlm-flow__inputs {
  display: flex; flex-direction: column; gap: 0.45rem; max-width: 200px;
}
.vlm-flow__in { margin: 0; text-align: center; }
.vlm-flow__in img {
  width: 100%; max-width: 190px; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: var(--radius-sm); border: 1px solid var(--border); display: block;
}
.vlm-flow__in figcaption {
  font-family: 'JetBrains Mono', 'Courier New', monospace; font-size: 0.6rem;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-muted); margin-top: 0.15rem;
}
.vlm-flow__prompt {
  font-family: 'Google Sans', sans-serif; font-size: 0.78rem; font-style: italic;
  color: var(--ink-mid); background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 0.45rem 0.6rem; line-height: 1.35; text-align: center;
}
.vlm-flow__chip {
  display: inline-block; font-style: normal; font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.56rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--brand); background: var(--brand-pale); border: 1px solid var(--brand-light);
  border-radius: 99px; padding: 0.08rem 0.45rem; margin-right: 0.35rem; vertical-align: 0.08em;
}
.vlm-flow__arrow { color: var(--brand-light); font-size: 1.4rem; flex: 0 0 auto; }
.vlm-flow__model {
  display: flex; flex-direction: column; align-items: center; gap: 0.3rem;
  background: linear-gradient(135deg, var(--brand-pale2) 0%, var(--brand-pale) 100%);
  border: 1px solid var(--brand-light); border-radius: var(--radius-md);
  padding: 1rem 1.1rem; text-align: center; min-width: 122px;
  font-family: 'Google Sans', sans-serif; font-weight: 600; font-size: 0.86rem; color: var(--ink);
  line-height: 1.25;
}
.vlm-flow__model i { font-size: 1.5rem; color: var(--brand); }
.vlm-flow__out { text-align: center; }
.vlm-flow__out video {
  width: 240px; max-width: 100%; aspect-ratio: 4 / 3; object-fit: cover;
  border-radius: var(--radius-md); box-shadow: var(--shadow-video); background: #0e1520; display: block;
}
.vlm-flow__out figcaption {
  font-family: 'Google Sans', sans-serif; font-size: 0.78rem; font-weight: 600;
  color: var(--ink); margin-top: 0.4rem;
}
@media (max-width: 768px) {
  .vlm-flow { flex-direction: column; }
  .vlm-flow__arrow { transform: rotate(90deg); }
  .vlm-flow__inputs { flex-direction: row; max-width: none; flex-wrap: wrap; justify-content: center; }
  .vlm-flow__inputs .vlm-flow__in img { max-width: 130px; }
}

/* ---- §03 subsection headings (Ours gallery vs Baseline comparison) ---- */
.rr-subhead {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  font-size: 1.5rem !important;
  font-weight: 700 !important;
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem !important;
}
.rr-subhead__chip {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  background: var(--ink-muted);
  border-radius: 99px;
  padding: 0.25rem 0.7rem;
}
.rr-subhead__chip--ours {
  color: #fff;
  background: var(--brand);
}
.rr-divider {
  border: none;
  height: 3px;
  width: 100%;
  margin: 3.6rem 0 0.4rem;
  border-radius: 99px;
  background: var(--ink-faint);
}

/* ===== Side-by-Side Render lightbox (click a render to inspect large) ===== */
.sxs-zoomable { position: relative; cursor: zoom-in; }
.sxs-zoomable::after {
  content: "\f00e";                /* fa magnifying-glass-plus */
  font-family: "Font Awesome 6 Free"; font-weight: 900;
  position: absolute; top: 0.6rem; right: 0.6rem;
  width: 1.9rem; height: 1.9rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; color: #fff;
  background: rgba(14, 21, 32, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 99px;
  opacity: 0; transition: opacity 0.18s ease;
  pointer-events: none;
}
.sxs-zoomable:hover::after { opacity: 1; }

body.sxs-lb-open { overflow: hidden; }

.sxs-lb {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; align-items: center; justify-content: center;
}
.sxs-lb[hidden] { display: none; }

.sxs-lb__backdrop {
  position: absolute; inset: 0;
  background: rgba(8, 12, 20, 0.9);
  backdrop-filter: blur(4px);
}

.sxs-lb__stage {
  position: relative;
  max-width: 92vw; max-height: 88vh;
  overflow: hidden;
  border-radius: 10px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
  cursor: zoom-in;
  touch-action: none;
  background: #0e1520;
}
.sxs-lb__stage.is-zoomed { cursor: grab; }
.sxs-lb__stage.is-panning { cursor: grabbing; }

.sxs-lb__video {
  display: block;
  max-width: 92vw; max-height: 88vh;
  transform-origin: center center;
  will-change: transform;
}

.sxs-lb__close {
  position: absolute; top: 16px; right: 20px;
  width: 2.4rem; height: 2.4rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; line-height: 1; color: #fff;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 99px;
  cursor: pointer;
  transition: background 0.18s ease;
}
.sxs-lb__close:hover { background: rgba(255, 255, 255, 0.24); }

.sxs-lb__hint {
  position: absolute; bottom: 16px; left: 50%;
  transform: translateX(-50%);
  font-family: 'Google Sans', sans-serif;
  font-size: 0.78rem; color: rgba(255, 255, 255, 0.82);
  background: rgba(14, 21, 32, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 99px;
  padding: 0.35rem 0.95rem;
  white-space: nowrap;
}

@media (max-width: 600px) {
  .sxs-lb__hint { font-size: 0.66rem; padding: 0.3rem 0.6rem; }
}

/* ==================== TRAINING-DATA SAMPLE GRID ==================== */
.train-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}
.train-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--border-mid);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .18s ease, transform .18s ease;
}
.train-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.train-card--3d  { border-top-color: var(--brand); }
.train-card--rgb { border-top-color: var(--ink-faint); }
.train-card__media {
  background: #11141b;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}
.train-card__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.train-card__body { padding: 0.7rem 0.8rem 0.85rem; }
.train-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.train-card__name { font-weight: 700; color: var(--ink); font-size: 0.95rem; }
.train-badge {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  white-space: nowrap;
}
.train-badge--rgbd { background: var(--brand-pale); color: var(--best-color); }
.train-badge--rgb  { background: var(--surface-alt); color: var(--ink-muted); border: 1px solid var(--border); }
.train-card__task {
  margin-top: 0.25rem;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.train-card__instr {
  margin: 0.4rem 0 0;
  font-size: 0.83rem;
  line-height: 1.35;
  color: var(--ink-mid);
}
@media (max-width: 900px) {
  .train-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .train-grid { grid-template-columns: 1fr; }
}


/* ==================== COMPACT EXAMPLE GRID (qualitative samples) ==================== */
.ex-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.7rem;
  margin-top: 0.6rem;
}
.ex-card {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .16s ease, transform .16s ease;
}
.ex-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.ex-card__media { aspect-ratio: 4 / 3; background: #11141b; }
.ex-card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.ex-card__body { padding: 0.4rem 0.5rem 0.5rem; }
.ex-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
}
.ex-card__name { font-weight: 700; font-size: 0.8rem; color: var(--ink); }
.ex-card__instr {
  margin: 0.25rem 0 0;
  font-size: 0.72rem;
  line-height: 1.28;
  color: var(--ink-muted);
}
.ex-card .train-badge { font-size: 0.6rem; padding: 0.08rem 0.36rem; }
@media (max-width: 680px) {
  .ex-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 420px) {
  .ex-grid { grid-template-columns: 1fr; }
}