/* ============================================================
   DisPOSE project page — custom academic blog template
   Designed to match the polish of wngTn/or_reid without
   inheriting its source. Vanilla CSS, no framework.
   ============================================================ */

:root {
  /* Light theme (default) */
  --bg:           #ffffff;
  --bg-elev:      #f8fafc;
  --bg-card:      #f1f5f9;
  --bg-code:      #f1f5f9;
  --border:       #e2e8f0;
  --border-soft:  #f1f5f9;
  --text:         #0f172a;
  --text-soft:    #475569;
  --text-mute:    #94a3b8;
  --accent:       #2563eb;
  --accent-soft:  #dbeafe;
  --accent-2:     #7c3aed;
  --highlight:    #fef3c7;
  --shadow:       0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-lg:    0 10px 30px rgba(15, 23, 42, 0.08);
  --radius:       12px;
  --radius-sm:    8px;
  --maxw:         920px;
  --maxw-wide:    1100px;
  --font:         "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  /* Extra hues for the multi-segment efficiency chart (theme-aware). */
  --chart-teal:   #0891b2;
  --chart-amber:  #d97706;
  /* Ground-truth "red" callout in figure captions (AA-contrast on --bg). */
  --danger:       #dc2626;
}

[data-theme="dark"] {
  --bg:           #0b1020;
  --bg-elev:      #111729;
  --bg-card:      #151c30;
  --bg-code:      #0e1426;
  --border:       #1f2a44;
  --border-soft:  #182037;
  --text:         #e2e8f0;
  --text-soft:    #a1afc8;
  --text-mute:    #5e6b86;
  --accent:       #60a5fa;
  --accent-soft:  #1e3a8a;
  --accent-2:     #a78bfa;
  --highlight:    #3f3a14;
  --shadow:       0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-lg:    0 12px 40px rgba(0, 0, 0, 0.55);
  --chart-teal:   #22d3ee;
  --chart-amber:  #fbbf24;
  --danger:       #f87171;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--accent-2); }

p {
  margin: 0 0 1em;
  text-align: justify;
  /* Better justified-text rendering: hyphenate on small viewports so we don't
     get giant word-gaps; keep the wider line width relaxed. */
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
}
/* Short single-line UI bits stay centered — justify makes no sense when there
   is no wrapping, and looks ugly when they DO wrap (would space-out the items). */
.affiliation-block,
.footer p,
.results-table caption {
  text-align: center;
  hyphens: manual;
  -webkit-hyphens: manual;
}
/* All prose blocks: justified, centered as a block via their own max-width. */
.dataset-blurb,
.chart-footnote,
.section-title-block > p,
.contrib-body {
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
}
/* Figure + teaser captions get block / justified text — defined at their
   original rule sites so specificity matches and the override sticks. */
strong { color: var(--text); font-weight: 600; }
em { color: var(--text); font-style: italic; }
/* Consistent, non-line-disrupting sub/superscripts everywhere (e.g. AP25). */
sub, sup { font-size: 0.72em; line-height: 0; }

h1, h2, h3, h4 {
  color: var(--text);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.6em;
  letter-spacing: -0.02em;
}

/* --- Heading scale -----------------------------------------
   Clear visual jumps between every level so hierarchy reads at a glance:
   h1   = 2.0–2.8 rem  · hero / page title
   h2   = 1.8–2.2 rem  · major section title (with accent bar underline)
   h3   = 1.35–1.55 rem · subsection (with colored prefix square)
   h4   = 0.95 rem      · label style (uppercase, tracked)
-------------------------------------------------------------- */
h1 {
  font-size: clamp(2.0rem, 3.4vw + 0.6rem, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.14;
}
h2 {
  font-size: clamp(1.8rem, 1.2vw + 1.3rem, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  margin: 1.6em 0 0.55em;
}
h3 {
  font-size: clamp(1.35rem, 0.4vw + 1.2rem, 1.55rem);
  font-weight: 600;
  letter-spacing: -0.012em;
  margin: 1.8em 0 0.5em;
  display: flex;
  align-items: center;
  gap: 14px;
}
h3::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 26px;
  background: var(--accent);
  border-radius: 3px;
  flex-shrink: 0;
}
h4 {
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 1.4em 0 0.6em;
}

/* Accent underline bar under centered section h2s (only when wrapped in
   .section-title-block; otherwise h2 stays plain). */
.section-title-block h2 {
  margin-top: 0;
  padding-bottom: 12px;
  position: relative;
}
.section-title-block h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* When h3 is centered (.text-center scope or inside section-title-block),
   center the flex line instead of left-aligning. */
.section-title-block h3 {
  justify-content: center;
}

/* Override the global label-style h4 inside chart components where they're
   used as small, lightweight chart labels (not paragraph headings). */
.efficiency-panel h4,
.component-bar h4 {
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--text-soft);
  margin: 0 0 10px;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3em 0;
}

::selection { background: var(--accent-soft); color: var(--text); }

/* Visible keyboard focus on every interactive control (none existed before).
   Mouse clicks keep the clean look; only keyboard navigation shows the ring. */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
:focus:not(:focus-visible) { outline: none; }

/* --- Layout containers ------------------------------------ */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 72px 0; border-top: 1px solid var(--border-soft); }
/* Alternating tinted sections give the page a chapter rhythm instead of one
   continuous white scroll. Uses --bg-card (the deeper tint) so the lighter
   --bg-elev cards/strips inside them still read as raised. */
.section-alt { background: var(--bg-card); }
/* Sticky-navbar offset so in-page jumps clear the bar instead of hiding titles. */
section[id], .dataset-section[id] { scroll-margin-top: 72px; }

/* --- Navbar ----------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.navbar-inner {
  max-width: var(--maxw-wide);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.navbar-brand {
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  font-size: 1.05rem;
  white-space: nowrap;
}
.navbar-brand .brand-accent { color: var(--accent); }
.navbar-links {
  display: flex;
  align-items: center;
  gap: 22px;
}
.navbar-links a {
  color: var(--text-soft);
  font-size: 0.95rem;
  font-weight: 500;
}
.navbar-links a:hover { color: var(--text); }
/* Scroll-spy: highlight the link for the section currently in view. */
.navbar-links a.active { color: var(--accent); font-weight: 600; }

/* Sub-tab variant: a lighter underline control so a second switcher in the same
   section does not mirror the primary pill switcher. (Used in #generalization.) */
.dataset-tabs.dataset-subtabs {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  gap: 6px;
  border-bottom: 1px solid var(--border);
}
.dataset-subtabs .dataset-tab-btn {
  border-radius: 0;
  padding: 9px 14px;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.dataset-subtabs .dataset-tab-btn:hover:not(.active) { background: none; color: var(--text); }
.dataset-subtabs .dataset-tab-btn.active {
  background: none;
  color: var(--accent);
  border-bottom-color: var(--accent);
  box-shadow: none;
}
.dataset-subtabs .dataset-tab-num { display: none; }
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-soft);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.18s ease;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-mute); transform: scale(1.05); }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (max-width: 720px) {
  .navbar-links { gap: 12px; }
  .navbar-links a { display: none; }
  .navbar-links a.always-show { display: inline; }
}

/* --- Hero ------------------------------------------------- */
.hero {
  padding: 60px 0 32px;
  text-align: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(1.55rem, 2.4vw + 0.55rem, 2.25rem);
  letter-spacing: -0.025em;
  margin-bottom: 0.4em;
  line-height: 1.18;
}
.hero-title .title-accent { color: var(--accent); }
.hero-title .title-main,
.hero-title .title-sub {
  display: block;
  white-space: nowrap;
}
.hero-title .title-sub {
  font-size: 0.7em;
  font-weight: 600;
  color: var(--text-soft);
  margin-top: 0.35em;
}
/* On narrow viewports, allow wrapping again so the title doesn't overflow. */
@media (max-width: 720px) {
  .hero-title .title-main,
  .hero-title .title-sub { white-space: normal; }
}


/* Author grid */
.authors-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px 26px;
  margin: 28px auto 18px;
  max-width: 760px;
}
.author-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  min-width: 90px;
}
.author-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  background: var(--bg-card);
  transition: transform 0.18s ease, border-color 0.18s ease;
}
.author-card a:hover .author-avatar {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.author-name {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}
.author-name a { color: inherit; }
.author-name a:hover { color: var(--accent); }
.author-name sup { color: var(--text-mute); font-weight: 400; }
.affiliation-block {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-soft);
  line-height: 1.7;
}
.affiliation-sep { color: var(--text-mute); }

/* Publication link buttons */
.publication-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 26px 0 10px;
}
.pub-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--text);
  color: var(--bg);
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  border: 1px solid var(--text);
  transition: all 0.15s ease;
}
.pub-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.pub-btn.disabled {
  background: transparent;
  color: var(--text-mute);
  border-color: var(--border);
  cursor: not-allowed;
  pointer-events: none;
}
.pub-btn .icon { font-size: 0.95rem; display: inline-flex; align-items: center; }
.pub-btn .icon svg { display: block; }
.venue-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-card);
  color: var(--text-soft);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border: 1px solid var(--border);
  margin-top: 14px;
}

/* --- Hero teaser figure ----------------------------------- */
.teaser {
  margin: 36px auto 0;
}
.teaser img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
}
.teaser-video-wrap {
  position: relative;
  cursor: pointer;
  border-radius: var(--radius);
  overflow: hidden;
  line-height: 0;
}
.teaser-video-wrap video {
  width: 100%;
  height: auto;
  display: block;
  background: #000;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
}
/* Safari/iOS draw a native centre "start playback" button on a paused, controls-less
   <video>. It overlaps our own overlay and swallows the centre click into Safari's
   shadow DOM (so only the bottom-right corner reached our handler). Hide it so the
   whole frame is click-to-play through the wrapper. */
.teaser-video-wrap video::-webkit-media-controls,
.teaser-video-wrap video::-webkit-media-controls-overlay-play-button,
.teaser-video-wrap video::-webkit-media-controls-start-playback-button {
  display: none !important;
  -webkit-appearance: none;
}
.video-play-overlay {
  position: absolute;
  /* Sit in the lower-right corner so the centre of the video is never blocked. */
  right: 14px;
  bottom: 14px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s ease;
}
.video-play-overlay .play-glyph {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.video-play-overlay .play-glyph svg { width: 16px; height: 16px; margin-left: 2px; }
/* Only reveal the glyph when the video is actually paused — never on hover. */
.teaser-video-wrap.paused .video-play-overlay { opacity: 1; }

.teaser-caption {
  font-size: 0.95rem;
  color: var(--text-soft);
  margin: 18px auto 0;
  line-height: 1.65;
  max-width: 820px;
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
}
.teaser-caption strong { color: var(--text); font-weight: 600; }
.teaser-caption em { color: var(--accent); font-style: normal; font-weight: 500; }

/* --- Cards / abstract ------------------------------------- */
.abstract-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin: 0 auto;
  max-width: 820px;
  box-shadow: var(--shadow);
}
.abstract-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
/* Bold one-line TL;DR so the skimmer gets the gist before the paragraph. */
.abstract-tldr {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  margin: 0 0 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
.abstract-tldr .tldr-tag { color: var(--accent); font-weight: 700; }
.abstract-body {
  font-size: 1rem;
  color: var(--text);
  line-height: 1.7;
  text-align: left;
}

/* Contributions cards */
.contrib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.contrib-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px 60px;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.contrib-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
  color: inherit;
}
.contrib-card:hover .contrib-cta {
  color: var(--accent);
  transform: translateX(3px);
}
.contrib-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.contrib-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  flex-shrink: 0;
}
.contrib-icon svg { width: 26px; height: 26px; }
.contrib-num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
}
.contrib-title {
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.contrib-body {
  font-size: 0.95rem;
  color: var(--text-soft);
  margin: 0;
  line-height: 1.55;
}
.contrib-cta {
  position: absolute;
  bottom: 20px;
  left: 22px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-mute);
  letter-spacing: 0.02em;
  transition: color 0.2s ease, transform 0.2s ease;
}
.contrib-cta::after { content: " →"; }

/* Overview "idea" cards: explanatory (non-clickable) variant of .contrib-card.
   A left accent bar sets them apart from the navigational contribution cards;
   reclaim the reserved bottom padding and neutralize the link-style hover lift
   since these are plain divs, not anchors. */
.idea-card { padding-bottom: 24px; border-left: 4px solid var(--accent); }
.idea-card:hover {
  transform: none;
  border-color: var(--border);
  border-left-color: var(--accent);
  box-shadow: var(--shadow);
}
/* Narrow, left-aligned reading column for the dense math-laden method prose
   (wide justified lines were hard to skim). Figures stay full container width. */
.method-body {
  max-width: 720px;
  margin-left: 0;
  margin-right: auto;
  text-align: left;
}

/* Scannable card internals: a one-line punch then short bulleted points. */
.idea-punch {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 12px;
  line-height: 1.4;
  text-align: left;
}
.idea-punch em { color: var(--accent); font-style: normal; }
.idea-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.idea-points li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  color: var(--text-soft);
  line-height: 1.45;
  text-align: left;
}
.idea-points li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 0.5em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--accent);
}
.idea-points strong { color: var(--text); }

/* --- Limitations cards ----------------------------------- */
.limit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.limit-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.limit-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.limit-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}
.limit-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--text-mute) 18%, transparent);
  color: var(--text-soft);
  flex-shrink: 0;
}
.limit-icon svg { width: 22px; height: 22px; }
.limit-num {
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.limit-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.limit-body {
  font-size: 0.92rem;
  color: var(--text-soft);
  margin: 0;
  line-height: 1.55;
  text-align: left;
}

/* --- Figures and videos ----------------------------------- */
.figure {
  margin: 28px 0;
}
/* Side-by-side qualitative comparison (SelfPose3D vs DisPOSE); stacks on narrow screens. */
.qual-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.qual-pair img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
}
@media (max-width: 640px) {
  .qual-pair { grid-template-columns: 1fr; }
}
/* The comparison caption describes both panels, so let it span the full image width
   instead of the narrower default, so its edges line up with the images. */
.qual-figure .fig-caption {
  max-width: none;
}
.figure img,
.figure video {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
}
.figure img.zoomable {
  cursor: zoom-in;
  transition: filter 0.15s ease, border-color 0.15s ease;
}
.figure img.zoomable:hover {
  filter: brightness(1.04);
  border-color: var(--accent);
}
/* Paper figures with light/pink backgrounds (the LaTeX exports) look better
   on a soft white card than against the dark theme; this just wraps them. */
[data-theme="dark"] .figure.light-figure img {
  background: #ffffff;
  padding: 14px;
  border-color: #e2e8f0;
}
.figure .fig-caption {
  font-size: 0.88rem;
  color: var(--text-soft);
  margin: 14px auto 0;
  line-height: 1.6;
  max-width: 760px;
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
  -webkit-hyphens: auto;
}

/* --- Lightbox --------------------------------------------- */
#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(8, 11, 24, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
#lightbox.visible {
  opacity: 1;
  pointer-events: auto;
}
#lightbox .lightbox-inner {
  max-width: min(1400px, 95vw);
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  transform: scale(0.97);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  min-height: 0;
}
#lightbox.visible .lightbox-inner { transform: scale(1); }
#lightbox img {
  flex: 0 1 auto;
  /* Reserve at least 25vh for the caption block; image shrinks if needed. */
  max-width: 100%;
  max-height: 75vh;
  min-height: 0;
  object-fit: contain;
  border-radius: var(--radius);
  background: #0a0a0f;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}
#lightbox .lightbox-caption {
  flex: 0 0 auto;
  color: #e2e8f0;
  font-size: 0.92rem;
  line-height: 1.6;
  text-align: center;
  padding: 4px 14px 8px;
  max-width: 900px;
  margin: 0 auto;
  overflow-y: auto;
  max-height: 18vh;
}
#lightbox .lightbox-caption strong { color: #ffffff; }
#lightbox .lightbox-caption em { color: #c7d2fe; }
/* Hide the caption block entirely when there's nothing to show — avoids a
   stray "empty box" gap below the image. */
#lightbox .lightbox-caption:empty { display: none; }
#lightbox .lightbox-close {
  position: absolute;
  top: 18px; right: 22px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #e2e8f0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: background 0.15s ease, transform 0.15s ease;
}
#lightbox .lightbox-close:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: scale(1.06);
}
@media (prefers-reduced-motion: reduce) {
  #lightbox, #lightbox .lightbox-inner { transition: none; }
}

.video-card {
  margin: 0;
  position: relative;
}
.video-card video {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: #000;
  display: block;
}
.video-label {
  position: absolute;
  top: 12px; left: 12px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0, 0, 0, 0.55);
  padding: 4px 10px;
  border-radius: 999px;
  backdrop-filter: blur(6px);
  z-index: 2;
}

/* --- Headline stats strip -------------------------------- */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 28px auto 0;
  max-width: 920px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.stat-cell {
  text-align: center;
  padding: 22px 18px;
  border-left: 1px solid var(--border-soft);
}
.stat-cell:first-child { border-left: none; }
.stat-value {
  display: block;
  font-size: clamp(1.7rem, 2vw + 1rem, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
}
.stat-value .stat-prefix,
.stat-value .stat-suffix { font-size: 0.62em; color: var(--accent); margin: 0 1px; font-weight: 600; }
.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-soft);
  letter-spacing: 0.02em;
  line-height: 1.4;
}
@media (max-width: 640px) {
  .stats-strip { grid-template-columns: 1fr; }
  .stat-cell { border-left: none; border-top: 1px solid var(--border-soft); }
  .stat-cell:first-child { border-top: none; }
}

/* --- Inline highlights ------------------------------------ */
.highlight-num {
  display: inline-block;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 1px 8px;
  border-radius: 6px;
  font-variant-numeric: tabular-nums;
}

/* --- Results tables --------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  margin: 18px 0 8px;
  box-shadow: var(--shadow);
}
/* One-line verdict above each table so the skimmer gets the result first. */
.table-takeaway {
  font-size: 0.95rem;
  color: var(--text);
  margin: 0 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  line-height: 1.5;
  text-align: left;
}
.table-takeaway strong { color: var(--accent); }
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
  font-size: 0.92rem;
}
.results-table caption {
  caption-side: top;
  text-align: left;
  padding: 14px 18px 6px;
  color: var(--text-soft);
  font-size: 0.88rem;
  line-height: 1.5;
}
.results-table caption .caption-label {
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.78rem;
  display: inline-block;
  margin-right: 8px;
}
.results-table thead th {
  background: var(--bg-card);
  color: var(--text-soft);
  font-weight: 600;
  text-align: right;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.results-table thead th:first-child { text-align: left; }
.results-table thead th.subhead {
  background: var(--bg-elev);
  text-align: center;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text-mute);
  font-weight: 500;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}
.results-table tbody td {
  padding: 11px 14px;
  text-align: right;
  border-bottom: 1px solid var(--border-soft);
  color: var(--text);
}
.results-table tbody td:first-child { text-align: left; color: var(--text); }
.results-table tbody tr:last-child td { border-bottom: none; }
.results-table tbody tr.group-header td {
  background: var(--bg-elev);
  color: var(--text-mute);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border-soft);
  border-top: 1px solid var(--border-soft);
  text-align: left;
}
.results-table tbody tr.ours td {
  background: color-mix(in srgb, var(--accent-soft) 50%, transparent);
  font-weight: 600;
}
.results-table tbody tr.ours td:first-child { color: var(--accent); }
.results-table .best { font-weight: 700; }
.results-table .note {
  color: var(--text-mute);
  font-size: 0.78rem;
  font-style: italic;
}

/* --- Dataset demarcation --------------------------------- */
.dataset-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px dashed var(--border);
}
.dataset-section:first-of-type { border-top: none; padding-top: 0; margin-top: 18px; }

/* --- Method-section visual aids -------------------------- */
/* Preliminary explainer block — sets up the hypergraph vocabulary. */
.preliminary-block {
  margin: 28px auto 32px;
  max-width: 920px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px 24px;
  box-shadow: var(--shadow);
}
.preliminary-block .hero-eyebrow {
  margin-bottom: 8px;
}
.preliminary-block h3 {
  margin: 6px 0 16px;
  text-align: left;
  justify-content: flex-start;
  font-size: 1.2rem;
}
.preliminary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 8px 0 14px;
}
@media (max-width: 640px) { .preliminary-grid { grid-template-columns: 1fr; } }
.prelim-card {
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
}
.prelim-card .prelim-svg {
  display: flex;
  justify-content: center;
  margin-bottom: 10px;
}
.prelim-card .prelim-svg svg { width: 100%; max-width: 220px; height: auto; }
.prelim-card .prelim-title {
  font-weight: 700;
  font-size: 0.96rem;
  color: var(--text);
  margin-bottom: 4px;
  display: block;
}
.prelim-card p {
  font-size: 0.88rem;
  color: var(--text-soft);
  margin: 0;
  line-height: 1.55;
  text-align: left;
  hyphens: manual;
}
.prelim-card.is-ours {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent-soft) 35%, var(--bg));
}
[data-theme="dark"] .prelim-card.is-ours {
  background: color-mix(in srgb, var(--accent-soft) 30%, var(--bg-elev));
}
.prelim-foot {
  font-size: 0.88rem;
  color: var(--text-soft);
  margin: 0;
  line-height: 1.55;
  text-align: justify;
  hyphens: auto;
  padding-top: 4px;
}
.prelim-foot strong { color: var(--text); }

/* Numbered step pills — the pipeline shown as 1 → 2 → 3 chips. */
.step-row {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 10px;
  margin: 22px auto 30px;
  justify-content: center;
  max-width: 920px;
}
.step-pill {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px 12px 12px;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  flex: 1 1 220px;
  min-width: 0;
  max-width: 320px;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.step-pill:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.step-pill .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.88rem;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}
.step-pill .step-text {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.35;
}
.step-pill .step-text strong { color: var(--accent); font-weight: 600; }
.step-arrow {
  display: inline-flex;
  align-items: center;
  color: var(--text-mute);
  font-size: 1.5rem;
  font-weight: 300;
  align-self: center;
}
@media (max-width: 740px) {
  .step-row { flex-direction: column; align-items: stretch; }
  .step-pill { max-width: 100%; }
  .step-arrow { transform: rotate(90deg); align-self: center; }
}

/* --- Centered section heads ------------------------------ */
.section-title-block {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 32px;
}
.section-title-block .hero-eyebrow { margin-bottom: 14px; }
.section-title-block h2 { margin: 0 0 14px; }
.section-title-block > p {
  color: var(--text-soft);
  font-size: 1.02rem;
  margin: 0 auto;
}

/* --- Dataset tabs (segmented control) -------------------- */
.dataset-tabs-wrap {
  margin: 24px 0 20px;
  text-align: center;
}
.dataset-tabs-label {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 10px;
  display: block;
}
.dataset-tabs {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 5px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  max-width: 100%;
}
.dataset-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  background: transparent;
  border: none;
  color: var(--text-soft);
  font: inherit;
  font-weight: 500;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
  white-space: nowrap;
}
.dataset-tab-btn:hover:not(.active) {
  color: var(--text);
  background: var(--bg-card);
}
.dataset-tab-btn.active {
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.12);
}
.dataset-tab-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--text-mute);
}
.dataset-tab-btn.active .dataset-tab-num {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}
@media (max-width: 720px) {
  .dataset-tab-btn { padding: 8px 14px; font-size: 0.86rem; }
  .dataset-tab-num { display: none; }
}

.dataset-panel {
  display: none;
}
.dataset-panel.active {
  display: block;
  animation: dataset-fade-in 0.28s ease both;
}
@keyframes dataset-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .dataset-panel.active { animation: none; }
}

/* Inside a tab panel, the inner .dataset-section shouldn't draw its own
   top-border (the tab bar is the separator) and shouldn't pad-top either. */
.dataset-panel .dataset-section {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}
.dataset-header {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 6px;
}
.dataset-tag {
  display: inline-block;
  padding: 5px 12px;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
/* When two tags sit next to each other (e.g. Shelf + Campus), give the second
   a slightly different accent so the count reads at a glance. */
.dataset-tag + .dataset-tag {
  background: var(--accent-2);
}
.dataset-tag-sep {
  color: var(--text-mute);
  font-size: 0.85rem;
  align-self: center;
}
.dataset-name {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.015em;
}
.dataset-blurb {
  color: var(--text-soft);
  font-size: 0.95rem;
  margin: 4px auto 14px;
  max-width: 740px;
  text-align: center;
}

/* Method links inside tables — keep subtle so the data dominates */
.results-table td:first-child a.method-link {
  color: inherit;
  border-bottom: 1px dashed transparent;
  transition: color 0.12s ease, border-color 0.12s ease;
}
.results-table td:first-child a.method-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.results-table td:first-child a.method-link::after {
  content: " ↗";
  color: var(--text-mute);
  font-size: 0.7em;
  opacity: 0.65;
  transition: opacity 0.12s ease, color 0.12s ease;
}
.results-table td:first-child a.method-link:hover::after { color: var(--accent); opacity: 1; }
.results-table tbody tr.ours td:first-child { font-weight: 600; }

/* --- Efficiency chart (inline SVG) ------------------------ */
.efficiency-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 18px 0;
  box-shadow: var(--shadow);
}
.efficiency-card .chart-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}
.efficiency-card .chart-title {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}
.efficiency-card .chart-legend {
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-soft);
}
.efficiency-card .chart-legend .swatch {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  margin-right: 6px;
  vertical-align: middle;
}
.efficiency-card .chart-footnote {
  font-size: 0.82rem;
  color: var(--text-mute);
  margin-top: 14px;
  line-height: 1.55;
}
.efficiency-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 720px) {
  .efficiency-grid { grid-template-columns: 1fr; }
}
.efficiency-panel {
  position: relative;
}
.efficiency-panel h4 {
  margin: 0 0 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
  letter-spacing: 0.02em;
}
.efficiency-panel svg { width: 100%; height: auto; display: block; }
.efficiency-panel .bar-baseline { fill: var(--text-mute); }
.efficiency-panel .bar-ours     { fill: var(--accent); }
.efficiency-panel .grid-line    { stroke: var(--border); stroke-width: 1; stroke-dasharray: 2 3; }
.efficiency-panel .axis-text    { fill: var(--text-mute); font-size: 11px; font-family: var(--font-mono); }
.efficiency-panel .value-label  { fill: var(--text); font-size: 10.5px; font-family: var(--font-mono); font-weight: 600; }
.efficiency-panel .group-label  { fill: var(--text-soft); font-size: 11px; font-family: var(--font); }
.efficiency-panel .speedup {
  position: absolute;
  top: -2px; right: 0;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  letter-spacing: 0.03em;
}

/* Component-wise stacked bar */
.component-bar { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--border-soft); }
.component-bar h4 {
  margin: 0 0 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
}
.component-bar svg { width: 100%; height: 64px; display: block; }
.component-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--text-soft);
}
.component-legend .swatch {
  width: 11px; height: 11px;
  border-radius: 3px;
  display: inline-block;
  margin-right: 6px;
  vertical-align: middle;
}

/* --- BibTeX ----------------------------------------------- */
.bibtex-container {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  overflow: hidden;
}
.bibtex-container pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--text);
  overflow-x: auto;
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-soft);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: #16a34a; border-color: #16a34a; }
[data-theme="dark"] .copy-btn.copied { color: #4ade80; border-color: #4ade80; }

/* --- Footer ----------------------------------------------- */
.footer {
  padding: 36px 0 64px;
  text-align: center;
  color: var(--text-soft);
  font-size: 0.9rem;
  border-top: 1px solid var(--border-soft);
  margin-top: 48px;
}
.footer a { font-weight: 500; }

/* --- GDPR banner ------------------------------------------ */
#gdpr-banner {
  position: fixed;
  bottom: 16px; left: 16px; right: 16px;
  max-width: 720px;
  margin: 0 auto;
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  z-index: 100;
  transform: translateY(140%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
#gdpr-banner.visible { transform: translateY(0); }
#gdpr-banner a { color: var(--accent); font-weight: 500; }
#gdpr-banner button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  font-size: 0.85rem;
  transition: filter 0.15s ease;
}
#gdpr-banner button:hover { filter: brightness(1.1); }

/* --- Scroll reveal ---------------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* --- Mobile tweaks ---------------------------------------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .section { padding: 36px 0; }
  .author-avatar { width: 60px; height: 60px; }
  .abstract-card { padding: 20px; }
  .navbar-brand { font-size: 0.95rem; }
  h2 { font-size: 1.35rem; }
}