/* =====================================================
   DataPrep-Bench — Academic Project Page
   Professional, modern, scholarly design system
   ===================================================== */

:root {
  /* Palette: deep academic navy + warm scholarly accent */
  --color-bg:           #ffffff;
  --color-bg-alt:       #f6f7fb;
  --color-bg-deep:      #0f172a;
  --color-text:         #0f172a;
  --color-text-muted:   #475569;
  --color-text-faint:   #64748b;
  --color-border:       #e2e8f0;
  --color-border-strong:#cbd5e1;

  --color-primary:      #1e3a8a;   /* deep indigo / scholarly blue */
  --color-primary-soft: #eef2ff;
  --color-accent:       #b45309;   /* burnt amber accent */
  --color-accent-soft:  #fef3c7;

  --color-track-1:      #1e3a8a;   /* construction = blue */
  --color-track-1-soft: #e0e7ff;
  --color-track-2:      #7c2d12;   /* quality = burnt sienna */
  --color-track-2-soft: #fee7d6;

  /* Typography */
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Source Serif 4', 'Source Serif Pro', 'Times New Roman', Georgia, serif;
  --font-mono:  'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;

  /* Layout */
  --max-w:        1180px;
  --max-w-narrow: 820px;
  --radius-sm:    8px;
  --radius:       14px;
  --radius-lg:    20px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(15,23,42,.04), 0 1px 3px rgba(15,23,42,.06);
  --shadow:    0 4px 14px rgba(15,23,42,.06), 0 2px 4px rgba(15,23,42,.04);
  --shadow-lg: 0 20px 50px -20px rgba(15,23,42,.18), 0 8px 20px -10px rgba(15,23,42,.08);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  /* keep section anchors visible below the sticky nav on direct hash load */
  scroll-padding-top: 76px;
}

/* Skip-to-content link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 16px;
  border-radius: 0 0 8px 0;
  font-weight: 600;
  font-size: 14px;
}
.skip-link:focus {
  left: 0;
  color: #fff;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover { color: var(--color-accent); }

.container        { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }
.container.narrow { max-width: var(--max-w-narrow); }

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: rgba(255,255,255,.78);
  border-bottom: 1px solid var(--color-border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-weight: 700;
  font-size: 17px;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 28px;
}
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.01em;
  position: relative;
  padding: 4px 0;
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--color-text); }
.nav-links a.active {
  color: var(--color-primary);
  font-weight: 600;
}
.nav-links a.active::after {
  /* underline indicator for the section currently in view */
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
}

@media (max-width: 900px) {
  .nav-inner { padding: 12px 16px 12px 20px; gap: 14px; }
  .nav-brand { font-size: 15px; flex-shrink: 0; }
  .nav-links {
    gap: 18px;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    /* fade-out edges hint at scroll */
    mask-image: linear-gradient(to right, transparent 0, #000 12px, #000 calc(100% - 12px), transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent 0, #000 12px, #000 calc(100% - 12px), transparent 100%);
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { white-space: nowrap; font-size: 13.5px; }
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: 84px 0 64px;
  background:
    radial-gradient(ellipse 800px 400px at 50% -10%, rgba(30,58,138,.08), transparent 60%),
    linear-gradient(to bottom, #fafbff 0%, #ffffff 100%);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(15,23,42,.05) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.6) 0%, rgba(0,0,0,0) 70%);
}

.venue-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 6px 14px;
  border-radius: 100px;
  letter-spacing: 0.02em;
  margin-bottom: 22px;
  border: 1px solid #c7d2fe;
}

.title {
  font-family: var(--font-serif);
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  color: var(--color-text);
}
.title-accent {
  background: linear-gradient(135deg, #1e3a8a 0%, #4338ca 50%, #7c3aed 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.authors {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  font-size: 16px;
  line-height: 1.9;
}
/* Authors are inline; each one stays glued to its mark; the separator
   is a trailing ::after on every author except the last so when a line wraps
   the comma stays at the END of the previous line rather than starting the next. */
.author {
  display: inline;
  color: var(--color-text);
  font-weight: 500;
  white-space: nowrap;
}
.author:not(:last-child)::after {
  /* Comma avoids rare cases where U+00B7 (·) misrenders in ::after under CJK font fallback */
  content: ", ";
  color: var(--color-text-faint);
  font-family: var(--font-sans);
  font-weight: inherit;
  margin-right: 4px;
}
.author-mark {
  color: var(--color-accent);
  font-weight: 700;
  margin-left: 1px;
  font-size: 12px;
  position: relative;
  top: -3px;
}

.affiliations {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  line-height: 1.75;
}
.aff-line {
  font-size: 14.5px;
  color: var(--color-text);
  font-weight: 500;
}
.contrib-note {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}
.contrib-note sup { color: var(--color-accent); font-weight: 700; }
.contrib-note a { font-family: var(--font-mono); font-size: 12.5px; }

/* CTA buttons */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 20px;
  border-radius: 100px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.005em;
  transition: all .18s ease;
  border: 1px solid transparent;
}
.cta i { font-size: 15px; }
.cta-dark {
  background: var(--color-bg-deep);
  color: #fff;
}
.cta-dark:hover {
  background: #1e293b;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

/* "Coming soon" placeholder for the Paper button */
.cta-soon {
  background: #334155;
  color: #fff;
  cursor: not-allowed;
  opacity: 0.78;
  position: relative;
}
.cta-soon:hover {
  background: #334155;
  color: #fff;
  transform: none;
  box-shadow: none;
  opacity: 0.92;
}
.cta-badge {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--color-accent);
  color: #fff;
  padding: 2px 7px;
  border-radius: 100px;
  margin-left: 4px;
  position: relative;
  top: -1px;
}

/* TL;DR */
.tldr {
  position: relative;
  background: linear-gradient(135deg, #fffdf5 0%, #fff8e7 100%);
  border: 1px solid #fde68a;
  border-left: 4px solid var(--color-accent);
  padding: 22px 26px 22px 28px;
  border-radius: var(--radius);
  margin-top: 8px;
  box-shadow: 0 1px 0 rgba(180,83,9,.04), 0 8px 24px -12px rgba(180,83,9,.18);
  overflow: hidden;
}
.tldr::before {
  /* watermark quote glyph for editorial feel */
  content: "\201C"; /* left double quotation mark */
  position: absolute;
  top: -12px;
  right: 16px;
  font-family: var(--font-serif);
  font-size: 88px;
  line-height: 1;
  color: var(--color-accent);
  opacity: 0.10;
  pointer-events: none;
  user-select: none;
}
.tldr-tag {
  position: absolute;
  top: -11px;
  left: 22px;
  background: var(--color-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 100px;
  box-shadow: 0 2px 6px rgba(180,83,9,.25);
}
.tldr p {
  margin: 0;
  font-size: 15.5px;
  color: var(--color-text);
  line-height: 1.7;
  position: relative;
  z-index: 1;
}

/* ============================================
   Teaser / Stat grid
   ============================================ */
.teaser-divider {
  border-top: 1px solid var(--color-border);
}
.teaser {
  padding: 56px 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 820px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}
.stat-card {
  position: relative;
  text-align: center;
  padding: 28px 18px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, #ffffff 0%, var(--color-bg-alt) 100%);
  border: 1px solid var(--color-border);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
  overflow: hidden;
}
.stat-card::before {
  /* subtle accent stripe at the top */
  content: "";
  position: absolute;
  top: 0; left: 18%; right: 18%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  opacity: 0;
  transition: opacity .22s ease;
}
.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
}
.stat-card:hover::before { opacity: 0.65; }
.stat-num {
  font-family: var(--font-serif);
  font-size: 46px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-weight: 600;
  font-size: 14.5px;
  color: var(--color-text);
  margin-bottom: 4px;
}
.stat-sub {
  font-size: 12.5px;
  color: var(--color-text-muted);
  line-height: 1.45;
  /* prevent ugly mid-word breaks like "Mistral-/7B" — keep model names whole */
  word-break: keep-all;
  hyphens: none;
  overflow-wrap: normal;
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 84px 0;
}
.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 36px;
  color: var(--color-text);
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  /* underline accent under section titles for editorial rhythm */
  position: relative;
  padding-bottom: 14px;
}
.section-title::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0;
  width: 56px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 100px;
  opacity: .85;
}
.section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 4px 10px;
  border-radius: 6px;
  letter-spacing: 0.04em;
  position: relative;
  top: -3px;
  border: 1px solid #c7d2fe;
}

.lead {
  font-size: 17.5px;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 880px;
  margin: 0 0 36px;
}
.lead-wide {
  max-width: none;
}

.abstract-body {
  font-family: var(--font-serif);
  font-size: 17.5px;
  line-height: 1.75;
  color: var(--color-text);
  margin: 0 0 18px;
  text-align: justify;
}
.abstract-body strong {
  font-weight: 600;
  color: var(--color-primary);
}
.abstract-body em {
  font-style: italic;
  color: var(--color-text);
}

.caption {
  font-size: 14px;
  color: var(--color-text-muted);
  text-align: center;
  font-style: italic;
  margin: 6px 0 32px;
}

/* Domain pills */
.domain-overview-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
  margin: -12px 0 30px;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.domain-overview-title {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin: 0;
  text-transform: uppercase;
}
.domain-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 0;
}
.domain-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--color-text);
  transition: all .15s ease;
}
.domain-pill:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}
.domain-pill i {
  color: var(--color-primary);
  font-size: 13px;
}
@media (max-width: 760px) {
  .domain-overview-card {
    align-items: flex-start;
    flex-direction: column;
  }
  .domain-grid {
    justify-content: flex-start;
  }
}

/* ============================================
   Paper figure
   ============================================ */
.paper-figure {
  margin: 26px auto 34px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.paper-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}
.paper-figure figcaption {
  padding: 12px 18px;
  font-size: 13.5px;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  font-style: italic;
}

/* ============================================
   Tracks Grid
   ============================================ */
.tracks-intro {
  max-width: none;
  margin: 0 0 28px;
  padding: 20px 22px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.7;
}
.tracks-intro strong {
  color: var(--color-text);
  font-weight: 600;
}
.track-flow {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.track-row {
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.8fr);
  gap: 26px;
  align-items: stretch;
  padding: 28px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.track-row-1 { border-left: 4px solid var(--color-track-1); }
.track-row-2 { border-left: 4px solid var(--color-track-2); }
.track-row-header {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-right: 4px;
}
.track-row-header h3 {
  font-family: var(--font-serif);
  font-size: 27px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 10px;
}
.track-row-header p {
  color: var(--color-text-muted);
  font-size: 15.5px;
  line-height: 1.6;
  margin: 0;
}
.track-row-1 .track-num { color: var(--color-track-1); }
.track-row-2 .track-num { color: var(--color-track-2); }
.track-step-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.track-step {
  padding: 16px 16px 15px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}
.track-step-label {
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.track-step p {
  margin: 0;
  color: var(--color-text);
  font-size: 14.5px;
  line-height: 1.6;
}
.track-step strong {
  color: var(--color-primary);
  font-weight: 600;
}
@media (max-width: 920px) {
  .track-row {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .track-step-grid {
    grid-template-columns: 1fr;
  }
}
.track-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 16px;
}
@media (max-width: 900px) {
  .track-grid { grid-template-columns: 1fr; }
}
.track-card {
  position: relative;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.track-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
}
.track-card-1 { border-top: 4px solid var(--color-track-1); }
.track-card-2 { border-top: 4px solid var(--color-track-2); }
/* faint corner glow on hover that picks up the track color */
.track-card::before {
  content: "";
  position: absolute;
  top: -40px; right: -40px;
  width: 160px; height: 160px;
  border-radius: 50%;
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}
.track-card-1::before { background: radial-gradient(closest-side, rgba(30,58,138,.10), transparent); }
.track-card-2::before { background: radial-gradient(closest-side, rgba(124,45,18,.10), transparent); }
.track-card:hover::before { opacity: 1; }

.track-header {
  margin-bottom: 16px;
}
.track-num {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.track-card-1 .track-num { color: var(--color-track-1); }
.track-card-2 .track-num { color: var(--color-track-2); }

.track-card h3 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.track-lead {
  font-size: 15.5px;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin: 0 0 18px;
}
.track-eq {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 20px;
  overflow-x: auto;
  font-size: 14px;
}
.track-points {
  list-style: none;
  margin: 0;
  padding: 0;
}
.track-points li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--color-text);
}
.track-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  transform: rotate(45deg);
}
.track-card-1 .track-points li::before { background: var(--color-track-1); }
.track-card-2 .track-points li::before { background: var(--color-track-2); }
.track-points strong { color: var(--color-text); font-weight: 600; }

/* ============================================
   Methods
   ============================================ */
.method-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 36px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.method-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
}
.method-tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.method-tag-1 { background: var(--color-track-1-soft); color: var(--color-track-1); }
.method-tag-2 { background: var(--color-track-2-soft); color: var(--color-track-2); }

.method-title {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.method-sub {
  font-size: 16px;
  color: var(--color-text-muted);
  margin: 0 0 26px;
  line-height: 1.6;
}
.method-explain-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(260px, .8fr);
  gap: 22px;
  margin-bottom: 26px;
}
.method-explain-main {
  padding: 22px 24px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.method-explain-main h4 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 12px;
}
.method-explain-main p {
  margin: 0 0 12px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.7;
}
.method-explain-main p:last-child { margin-bottom: 0; }
.method-explain-side {
  padding: 20px 22px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.method-card-1 .method-explain-side { border-top: 4px solid var(--color-track-1); }
.method-card-2 .method-explain-side { border-top: 4px solid var(--color-track-2); }
.method-side-title,
.method-pipeline-title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.method-side-title { margin-bottom: 12px; }
.method-checklist {
  list-style: none;
  margin: 0;
  padding: 0;
}
.method-checklist li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.55;
}
.method-checklist li:last-child { margin-bottom: 0; }
.method-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
}
.method-card-2 .method-checklist li::before { background: var(--color-track-2); }
.method-pipeline {
  margin-bottom: 22px;
}
.method-pipeline-title {
  margin-bottom: 12px;
}

.das-formula {
  background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 0 0 26px;
  text-align: center;
}
.das-formula-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 22px;
}
.method-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px) {
  .method-explain-grid { grid-template-columns: 1fr; }
  .method-grid,
  .method-grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
  .method-grid,
  .method-grid-3 { grid-template-columns: 1fr; }
}
.method-step {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 18px;
  position: relative;
  transition: transform .15s ease, border-color .15s ease;
}
.method-step:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-bg-deep);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
}
.step-title {
  font-weight: 700;
  font-size: 14.5px;
  color: var(--color-text);
  margin-bottom: 6px;
}
.step-desc {
  font-size: 13.5px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.method-callout {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--color-accent-soft);
  border: 1px solid #fcd34d;
  border-radius: var(--radius);
  padding: 16px 20px;
}
.proxy-grid + .method-callout {
  margin-top: 22px;
}
.method-callout i {
  color: var(--color-accent);
  font-size: 18px;
  margin-top: 3px;
  flex-shrink: 0;
}
.method-callout span {
  font-size: 14.5px;
  line-height: 1.6;
  color: #4a2c10;
}

/* ============================================
   Info grid (experiments + summaries)
   ============================================ */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.info-grid-2 {
  grid-template-columns: repeat(2, 1fr);
  margin-bottom: 22px;
}
@media (max-width: 980px) {
  .info-grid { grid-template-columns: repeat(2, 1fr); }
  .info-grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .info-grid { grid-template-columns: 1fr; }
}
.info-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 22px;
  box-shadow: var(--shadow-sm);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.info-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
}
.experiment-overview {
  display: grid;
  gap: 18px;
}
.experiment-principle {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 22px;
  background: var(--color-bg-deep);
  color: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  font-size: 15.5px;
  line-height: 1.65;
}
.experiment-principle i {
  color: var(--color-accent);
  margin-top: 4px;
  flex-shrink: 0;
}
.experiment-track-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.experiment-track-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 28px;
  box-shadow: var(--shadow-sm);
}
.experiment-track-card:first-child {
  border-top: 4px solid var(--color-track-1);
}
.experiment-track-card:nth-child(2) {
  border-top: 4px solid var(--color-track-2);
}
.experiment-track-tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.experiment-track-card:nth-child(2) .experiment-track-tag {
  color: var(--color-track-2);
}
.experiment-track-card h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 0 0 10px;
}
.experiment-track-card p {
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1.65;
  margin: 0 0 16px;
}
.experiment-track-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.experiment-track-card li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  color: var(--color-text);
  font-size: 14.5px;
  line-height: 1.55;
}
.experiment-track-card li:last-child {
  margin-bottom: 0;
}
.experiment-track-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
}
.experiment-track-card:nth-child(2) li::before {
  background: var(--color-track-2);
}
.experiment-standard {
  padding: 18px 20px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}
.experiment-standard-title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.experiment-domain-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.experiment-domain-list span {
  display: inline-flex;
  align-items: center;
  padding: 6px 11px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.4;
}
.experiment-domain-list strong {
  color: var(--color-primary);
  margin-right: 4px;
}
@media (max-width: 900px) {
  .experiment-track-grid {
    grid-template-columns: 1fr;
  }
}
.info-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.005em;
}
.info-title i {
  color: var(--color-primary);
  /* tiny rounded badge so the icon feels intentional rather than floating */
  background: var(--color-primary-soft);
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  flex-shrink: 0;
}
.info-body {
  color: var(--color-text-muted);
  font-size: 14.5px;
  line-height: 1.65;
}
.compact-list {
  margin: 0;
  padding-left: 18px;
}
.compact-list li { margin: 6px 0; }
.compact-list strong { color: var(--color-text); font-weight: 600; }

/* ============================================
   Tabs
   ============================================ */
.tabbar {
  display: inline-flex;
  gap: 8px;
  padding: 6px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
  margin: 10px 0 22px;
}
.tab {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--color-text-muted);
  font-weight: 700;
  font-size: 13px;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: all .15s ease;
}
.tab:hover {
  color: var(--color-text);
  background: var(--color-bg-alt);
  border-color: var(--color-border);
}
.tab.active {
  color: #fff;
  background: var(--color-bg-deep);
  border-color: var(--color-bg-deep);
}
.tabpane { display: none; }
.tabpane.active { display: block; }

/* ============================================
   Details + tables
   ============================================ */
.details {
  margin: 14px 0;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.details summary {
  cursor: pointer;
  padding: 14px 18px;
  font-weight: 700;
  color: var(--color-text);
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border-bottom: 1px solid var(--color-border);
}
.details[open] summary {
  border-bottom: 1px solid var(--color-border);
}
.table-wrap {
  position: relative;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  /* fade-out hint on the right edge so users see there is more to scroll;
     applied via mask, only really visible when the table actually overflows */
  -webkit-mask-image: linear-gradient(to right, #000 0, #000 calc(100% - 24px), rgba(0,0,0,.4) 100%);
          mask-image: linear-gradient(to right, #000 0, #000 calc(100% - 24px), rgba(0,0,0,.4) 100%);
}
@media (min-width: 1100px) {
  /* on wide screens the tables fit, so no need to show the fade */
  .table-wrap { -webkit-mask-image: none; mask-image: none; }
}
.paper-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 1480px;
}
.paper-table th,
.paper-table td {
  padding: 12px 12px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  font-size: 14px;
}
.paper-table th {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  background: var(--color-bg-alt);
}
.paper-table tbody tr:hover td {
  background: rgba(30,58,138,.04);
}
.table-note {
  padding: 12px 18px 16px;
  font-size: 12.8px;
  color: var(--color-text-faint);
}
.table-note code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-text);
}

/* ============================================
   Callouts (highlights)
   ============================================ */
.callout {
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 16px 18px;
  margin: 8px 0 16px;
  box-shadow: var(--shadow-sm);
  background: #fff;
}
.callout-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 14.5px;
  margin-bottom: 10px;
  letter-spacing: -0.005em;
}
.callout-title i { font-size: 15px; }
.callout-list {
  margin: 0;
  padding-left: 18px;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.6;
}
.callout-list li { margin: 6px 0; }
.callout-blue {
  border-left: 4px solid var(--color-track-1);
  background: linear-gradient(135deg, rgba(30,58,138,.06) 0%, rgba(255,255,255,1) 55%);
}
.callout-blue .callout-title { color: var(--color-track-1); }
.callout-blue .callout-title i { color: var(--color-track-1); }
.callout-purple {
  border-left: 4px solid #4f46e5;
  background: linear-gradient(135deg, rgba(79,70,229,.06) 0%, rgba(255,255,255,1) 55%);
}
.callout-purple .callout-title { color: #3730a3; }
.callout-purple .callout-title i { color: #3730a3; }

/* ============================================
   Findings
   ============================================ */
.findings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}
@media (max-width: 980px) {
  .findings-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .findings-grid { grid-template-columns: 1fr; }
}
.finding-card {
  padding: 26px 24px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.finding-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
}
.finding-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 14px;
}
.finding-card h4 {
  font-size: 16.5px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--color-text);
  letter-spacing: -0.005em;
  line-height: 1.35;
}
.finding-card p {
  font-size: 14.5px;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.65;
}
.finding-card strong {
  color: var(--color-text);
  font-weight: 600;
}

/* Highlight panel (DAS bars) */
.highlight-panel {
  position: relative;
  background:
    radial-gradient(ellipse 600px 200px at 100% 0%, rgba(30,58,138,.06), transparent 70%),
    linear-gradient(180deg, #ffffff 0%, #fafbff 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.highlight-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--color-text);
  letter-spacing: -0.005em;
}
.highlight-bars {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.bar-row {
  display: grid;
  grid-template-columns: 220px 1fr 70px;
  align-items: center;
  gap: 16px;
}
@media (max-width: 720px) {
  .bar-row { grid-template-columns: 110px 1fr 56px; gap: 10px; }
  .highlight-panel { padding: 24px 20px; }
}
.bar-label {
  font-size: 14px;
  color: var(--color-text);
  font-weight: 500;
}
.bar-track {
  height: 14px;
  background: var(--color-bg-alt);
  border-radius: 100px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  position: relative;
}
.bar-fill {
  height: 100%;
  width: var(--w);
  background: linear-gradient(90deg, var(--color-primary) 0%, #3730a3 55%, #6366f1 100%);
  border-radius: 100px;
  box-shadow: 0 1px 2px rgba(30,58,138,.25);
  transition: width .9s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}
.bar-fill::after {
  /* subtle inner highlight gives the bar a polished, dimensional look */
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 100px;
  background: linear-gradient(180deg, rgba(255,255,255,.18) 0%, transparent 50%);
  pointer-events: none;
}
.bar-fill-weak {
  background: linear-gradient(90deg, #94a3b8 0%, #cbd5e1 100%);
  box-shadow: none;
}
.bar-val {
  font-family: var(--font-mono);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--color-text);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.highlight-note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-faint);
  line-height: 1.6;
}

/* ============================================
   Resources
   ============================================ */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 900px) {
  .resource-grid { grid-template-columns: 1fr; }
}
.resource-card {
  display: block;
  padding: 30px 28px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  transition: all .18s ease;
}
.resource-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--color-primary);
  color: var(--color-text);
}
.resource-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--color-bg-deep);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}
.resource-title {
  font-weight: 700;
  font-size: 18px;
  margin-bottom: 6px;
  letter-spacing: -0.005em;
}
.resource-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 14px;
  line-height: 1.55;
}
.resource-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 500;
  /* prefer breaking at slash/dash boundaries; fall back to anywhere only if
     a single token genuinely cannot fit (e.g. very narrow viewport) */
  word-break: normal;
  overflow-wrap: anywhere;
  hyphens: none;
}

/* ============================================
   BibTeX
   ============================================ */
.bibtex-wrap {
  position: relative;
  background: var(--color-bg-deep);
  border-radius: var(--radius);
  /* allow horizontal scroll inside .bibtex; outer wrap clips just enough
     for rounded corners but lets the sticky copy button float above */
  overflow: hidden;
  margin-top: 14px;
}
.bibtex-copy {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #fff;
  border: 1px solid rgba(255,255,255,.22);
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  transition: background .15s ease;
}
.bibtex-copy:hover { background: rgba(255,255,255,.22); }
.bibtex {
  margin: 0;
  /* extra right-padding leaves room for the floating Copy button on every line,
     and `pre` (not pre-wrap) preserves the original BibTeX formatting; the parent
     scrolls horizontally on narrow viewports rather than awkward soft-wraps */
  padding: 28px 30px 28px 30px;
  padding-right: 110px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.75;
  color: #e2e8f0;
  white-space: pre;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  tab-size: 2;
}
@media (max-width: 540px) {
  .bibtex { font-size: 12px; padding: 22px 20px; padding-right: 96px; }
  .bibtex-copy { top: 10px; right: 10px; padding: 5px 10px; font-size: 11.5px; }
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-bg-deep);
  color: #cbd5e1;
  padding: 48px 0 32px;
  margin-top: 0;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: #fff;
}
.footer-tag {
  font-size: 13.5px;
  color: #94a3b8;
  margin-top: 2px;
}
.footer-links {
  display: flex;
  gap: 14px;
}
.footer-links a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.06);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: background .15s ease, transform .15s ease;
}
.footer-links a:hover {
  background: rgba(255,255,255,.14);
  transform: translateY(-2px);
  color: #fff;
}
.footer-fine {
  font-size: 12.5px;
  color: #64748b;
  margin-top: 22px;
  text-align: center;
}

/* ============================================
   Subsection title (used inside sections)
   ============================================ */
.subsection-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 32px 0 16px;
  /* small leading marker bar for editorial rhythm */
  display: flex;
  align-items: center;
  gap: 12px;
}
.subsection-title::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1em;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
  border-radius: 2px;
}

/* ============================================
   Related-Work comparison table
   ============================================ */
.related-work {
  margin-top: 36px;
}
.rel-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: #fff;
  box-shadow: var(--shadow-sm);
}
.rel-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
}
.rel-table th,
.rel-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  font-size: 14px;
  color: var(--color-text);
  vertical-align: middle;
}
.rel-table thead th {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  background: var(--color-bg-alt);
  font-weight: 600;
}
.rel-table tbody tr:last-child td { border-bottom: none; }
.rel-table .rel-ours td {
  background: linear-gradient(90deg, rgba(30,58,138,.06) 0%, rgba(30,58,138,.02) 100%);
  border-top: 2px solid var(--color-primary);
}
.cell-yes,
.cell-no,
.cell-partial {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.01em;
}
.cell-yes {
  color: #166534;
  background: #dcfce7;
  border: 1px solid #bbf7d0;
}
.cell-no {
  color: var(--color-text-faint);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
}
.cell-partial {
  color: #92400e;
  background: #fef3c7;
  border: 1px solid #fde68a;
}
.rel-caption { margin-top: 14px; }

/* ============================================
   Faithful results tables (Track 1 / Track 2)
   ============================================ */
.paper-table th,
.paper-table td {
  text-align: center;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
  white-space: nowrap;
}
.paper-table th.left-col,
.paper-table td.left-col {
  position: sticky;
  left: 0;
  z-index: 3;
  text-align: left;
  white-space: nowrap;
  padding-left: 16px;
  padding-right: 18px;
  font-weight: 500;
  background: #fff;
  box-shadow: 1px 0 0 var(--color-border), 8px 0 12px -12px rgba(15, 23, 42, 0.35);
}
.paper-table thead th.left-col {
  z-index: 5;
  background: var(--color-bg-alt);
}
.paper-table thead th[colspan] {
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}
.paper-table th.group-1 { background: rgba(30, 58, 138, 0.08); }
.paper-table th.group-2 { background: rgba(124, 45, 18, 0.06); }
.paper-table th.group-3 { background: rgba(180, 83, 9, 0.06); }

.paper-table tr.group-divider td {
  text-align: left;
  background: linear-gradient(90deg, #eef2ff 0%, #f8fafc 100%);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-track-1);
  text-transform: uppercase;
  padding: 8px 16px;
  border-top: 1px solid #c7d2fe;
  border-bottom: 1px solid #c7d2fe;
}
.paper-table tr.group-divider td.left-col {
  position: sticky;
  left: 0;
  z-index: 4;
  box-shadow: 1px 0 0 var(--color-border), 8px 0 12px -12px rgba(15, 23, 42, 0.35);
}
.paper-table tr.row-baseline td {
  background: rgba(15, 23, 42, 0.025);
  font-style: italic;
  color: var(--color-text-muted);
}
.paper-table tr.row-baseline td.left-col {
  background: #f8fafc;
  color: var(--color-text);
  font-style: normal;
}
.paper-table tr.row-ours td {
  background: linear-gradient(90deg, rgba(180, 83, 9, 0.08) 0%, rgba(180, 83, 9, 0.02) 100%);
  border-top: 2px solid var(--color-accent);
}
.paper-table tr.row-ours td.left-col {
  background: #fff7ed;
}
.paper-table tr:hover td { background-color: rgba(30,58,138,.03); }
.paper-table tr:hover td.left-col { background-color: #f8fafc; }
.paper-table tr.row-baseline:hover td { background-color: rgba(15, 23, 42, 0.05); }
.paper-table tr.row-baseline:hover td.left-col { background-color: #f1f5f9; }
.paper-table tr.row-ours:hover td { background-color: rgba(180, 83, 9, 0.10); }
.paper-table tr.row-ours:hover td.left-col { background-color: #ffedd5; }

/* ============================================
   Correlation table (Track 2)
   ============================================ */
.corr-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 980px;
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}
.corr-table thead th {
  background: var(--color-bg-alt);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  padding: 10px 8px;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  font-weight: 600;
}
.corr-table thead th.left-col { text-align: left; padding-left: 16px; }
.corr-table thead th.group-1 { background: rgba(30, 58, 138, 0.08); }
.corr-table thead th.group-2 { background: rgba(124, 45, 18, 0.06); }
.corr-table thead th.group-3 { background: rgba(180, 83, 9, 0.06); }
.corr-table thead th[colspan] { border-bottom: 1px solid var(--color-border); }

.corr-table tbody td {
  padding: 8px 8px;
  font-size: 13px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}
.corr-table tbody td.left-col {
  text-align: left;
  padding-left: 16px;
  padding-right: 18px;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}
.corr-table tbody tr:hover td { background-color: rgba(30,58,138,.03); }

.corr-table tr.grp-head td {
  background: linear-gradient(90deg, #eef2ff 0%, #f8fafc 100%);
  /* left-aligned for visibility on narrow viewports (see paper-table comment above) */
  text-align: left;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  text-transform: uppercase;
  padding: 7px 16px;
  border-top: 1px solid #c7d2fe;
  border-bottom: 1px solid #c7d2fe;
}

.corr-table tr.row-ours td {
  background: linear-gradient(90deg, rgba(180, 83, 9, 0.08) 0%, rgba(180, 83, 9, 0.02) 100%);
  border-top: 2px solid var(--color-accent);
  border-bottom: 1px solid #fde68a;
}
.corr-table tr.row-ours td.left-col {
  background: linear-gradient(90deg, rgba(180, 83, 9, 0.12) 0%, rgba(180, 83, 9, 0.04) 100%);
}

.corr-table .pos {
  background-color: #fffbeb;
  color: #78350f;
}
.corr-table .neg {
  background-color: #ecfdf5;
  color: #064e3b;
}
.corr-table .sig {
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.corr-table .best {
  /* refined "best per column" highlight: inset ring (softer than outline) +
     a faint amber glow underneath so it reads as an editorial highlight,
     not a UI selection state */
  font-weight: 800;
  position: relative;
  box-shadow:
    inset 0 0 0 1.5px var(--color-accent),
    0 0 0 1px rgba(180, 83, 9, 0.15);
  border-radius: 5px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 6px 0 16px;
  font-size: 13px;
  color: var(--color-text-muted);
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.legend-swatch {
  width: 18px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  display: inline-block;
}
.legend-swatch.sw-pos { background-color: #fffbeb; border-color: #fde68a; }
.legend-swatch.sw-neg { background-color: #ecfdf5; border-color: #bbf7d0; }
.legend-swatch.sw-sig {
  background: #fff;
  position: relative;
  font-weight: 700;
  font-size: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.legend-swatch.sw-sig::before {
  content: "ρ";
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

/* ============================================
   Proxy pills (DAS section)
   ============================================ */
.proxy-grid {
  margin-top: 22px;
  padding: 18px 22px;
  background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius);
}
.proxy-title {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}
.proxy-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.proxy-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: #fff;
  border: 1px solid var(--color-border-strong);
  border-radius: 100px;
  font-size: 13px;
  color: var(--color-text);
  font-weight: 500;
  transition: all .15s ease;
}
.proxy-pill:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  transform: translateY(-1px);
}
.proxy-pill strong { color: var(--color-primary); font-weight: 700; }

/* ============================================
   Plugin grid (Resources)
   ============================================ */
.plugin-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 8px;
}
@media (max-width: 800px) {
  .plugin-grid { grid-template-columns: 1fr; }
}
.plugin-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 26px 26px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.plugin-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--color-border-strong);
}
.plugin-card.plugin-1 { border-top: 4px solid var(--color-track-1); }
.plugin-card.plugin-2 { border-top: 4px solid var(--color-track-2); }
.plugin-tag {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.plugin-card.plugin-1 .plugin-tag { color: var(--color-track-1); }
.plugin-card.plugin-2 .plugin-tag { color: var(--color-track-2); }
.plugin-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
  letter-spacing: -0.005em;
}
.plugin-desc {
  font-size: 14.5px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================
   Misc utilities
   ============================================ */
::selection {
  background: rgba(30,58,138,.18);
  color: var(--color-text);
}

/* No-wrap utility — keeps things like model names ("Llama-3.1-8B") whole */
.nobr { white-space: nowrap; }

/* ============================================
   Reading-progress bar (top of viewport)
   ============================================ */
.read-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  z-index: 200;
  transition: width .15s linear;
  pointer-events: none;
  box-shadow: 0 1px 3px rgba(30,58,138,.18);
}

/* KaTeX adjustments */
.katex { font-size: 1.05em; }
.katex-display { margin: 0 !important; }
/* Equation containers: ensure horizontal scroll on narrow viewports rather than clipping;
   add a faint mask gradient on the right edge so users see there is more to scroll */
.track-eq, .das-formula {
  position: relative;
  -webkit-overflow-scrolling: touch;
}
.track-eq .katex-display,
.das-formula .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 2px 0;
}
@media (max-width: 540px) {
  .track-eq .katex,
  .das-formula .katex { font-size: 0.92em; }
  /* fade-out scroll affordance on the right edge of equation cards */
  .track-eq::after,
  .das-formula::after {
    content: "";
    position: absolute;
    top: 1px; right: 1px; bottom: 1px;
    width: 22px;
    pointer-events: none;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: linear-gradient(to right, transparent, var(--color-bg-alt) 80%);
  }
  .das-formula::after {
    background: linear-gradient(to right, transparent, #eef2ff 80%);
  }
}

/* ============================================
   Reduced motion — respect user preferences
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal,
  .reveal.in-view { opacity: 1 !important; transform: none !important; }
}

/* ============================================
   Print styles — clean academic export
   ============================================ */
@media print {
  :root {
    --color-bg: #fff;
    --color-bg-alt: #fff;
    --color-bg-deep: #fff;
  }
  html, body {
    background: #fff !important;
    color: #000 !important;
    font-size: 11pt;
    line-height: 1.5;
  }
  .nav,
  .skip-link,
  .footer,
  .tabbar,
  .bibtex-copy,
  .cta-row,
  .read-progress { display: none !important; }
  .hero {
    padding: 24px 0 12px;
    background: #fff !important;
  }
  .hero::before { display: none !important; }
  .section,
  .section-alt {
    padding: 20px 0;
    background: #fff !important;
    border: none !important;
    page-break-inside: avoid;
  }
  .section-title { margin-bottom: 12px; font-size: 18pt; }
  .title { font-size: 24pt; }
  .title-accent {
    -webkit-text-fill-color: #1e3a8a !important;
    color: #1e3a8a !important;
    background: none !important;
  }
  .stat-card,
  .track-card,
  .method-card,
  .info-card,
  .finding-card,
  .resource-card,
  .plugin-card,
  .highlight-panel,
  .related-work,
  .paper-figure,
  .callout {
    box-shadow: none !important;
    page-break-inside: avoid;
  }
  /* expand all collapsed sections so all data prints */
  details { display: block !important; }
  details > summary { font-weight: 700; margin-bottom: 8px; }
  details > *:not(summary) { display: block !important; }
  .tabpane { display: block !important; opacity: 1 !important; }
  .table-wrap { overflow: visible !important; }
  table { page-break-inside: auto; font-size: 9pt; }
  tr { page-break-inside: avoid; }
  a { color: #000 !important; text-decoration: underline; }
  /* show URLs after external links for offline reference */
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555;
    word-break: break-all;
  }
  a[href^="#"]::after { content: ""; }
}