/* ============================================================================
   About Page Styles — Machine Learning Systems
   Consistent with landing site design language (Inter font, Harvard crimson).
   ============================================================================ */

:root {
  --ab-accent: #A51C30;
  --ab-accent-hover: #8a1728;
  --ab-text: #1a1a2e;
  --ab-text-muted: #6b7280;
  --ab-bg: #ffffff;
  --ab-card-bg: #f9fafb;
  --ab-border: #e5e7eb;
}

.quarto-dark {
  --ab-text: #e5e7eb;
  --ab-text-muted: #9ca3af;
  --ab-bg: #0f1117;
  --ab-card-bg: #1a1d2e;
  --ab-border: #374151;
}

/* ── Hero Section ── */
.about-hero {
  padding: 6rem 2rem 3rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.about-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ab-accent);
  margin-bottom: 1rem;
}

.about-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--ab-text);
  margin-bottom: 1.5rem;
}

.about-tagline {
  font-family: 'Inter', sans-serif;
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--ab-text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* ── Override textbook accent-bar headers for site pages ── */
main h2, article h2, #quarto-content h2,
main h3, article h3, #quarto-content h3,
main h4, article h4, #quarto-content h4 {
  border-left: none;
  border-bottom: none;
  padding-left: 0;
  padding-bottom: 0;
}

/* ── Section Layout ── */
.about-section {
  max-width: 900px;
  margin: 0 auto 4rem;
  padding: 0 2rem;
}

.about-section h2 {
  font-family: 'Inter', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--ab-text);
  margin-bottom: 0.5rem;
  padding-top: 2rem;
}

.about-section h2 .section-icon {
  margin-right: 0.5rem;
  color: var(--ab-accent);
}

.about-section p, .about-section li {
  font-family: 'Inter', sans-serif;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ab-text-muted);
}

.about-section a {
  color: var(--ab-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.about-section a:hover {
  border-bottom-color: var(--ab-accent);
}

.about-divider {
  border: none;
  height: 1px;
  background: var(--ab-border);
  margin: 3rem auto;
  max-width: 200px;
}

/* ── Pillar Cards (Mission) ── */
.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.pillar-card {
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.pillar-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.pillar-card .pillar-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.pillar-card h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ab-text);
  margin-bottom: 0.5rem;
}

.pillar-card p {
  font-size: 0.9rem !important;
  line-height: 1.5 !important;
}

/* ── Stats Strip ── */
.stats-strip {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 12px;
}

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

.stat-number {
  font-family: 'Inter', sans-serif;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--ab-accent);
  display: block;
}

.stat-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ab-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ── Team Cards ── */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.team-card {
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.team-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.team-card img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
  border: 3px solid var(--ab-border);
}

.team-card h3 {
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--ab-text);
  margin-bottom: 0.25rem;
}

.team-card .team-role {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  color: var(--ab-accent);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.team-card .team-affiliation {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  color: var(--ab-text-muted);
}

/* ── Contributors Grid ── */
.contributors-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.contributor-avatar {
  position: relative;
  display: inline-block;
}

.contributor-avatar img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--ab-border);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.contributor-avatar:hover img {
  transform: scale(1.15);
  border-color: var(--ab-accent);
}

.contributor-avatar .contributor-tooltip {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ab-text);
  color: var(--ab-bg);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  margin-bottom: 4px;
}

.contributor-avatar:hover .contributor-tooltip {
  opacity: 1;
}

/* ── Adopter Logos ── */
.adopter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.adopter-card {
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 10px;
  padding: 1.25rem;
  text-align: center;
  transition: transform 0.2s ease;
}

.adopter-card:hover {
  transform: translateY(-2px);
}

.adopter-card .adopter-name {
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ab-text);
  margin-bottom: 0.25rem;
}

.adopter-card .adopter-detail {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  color: var(--ab-text-muted);
}

/* ── Press Items ── */
.press-list {
  list-style: none;
  padding: 0;
  margin-top: 1.5rem;
}

.press-list li {
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  transition: border-color 0.2s;
}

.press-list li:hover {
  border-color: var(--ab-accent);
}

.press-icon {
  font-size: 1.25rem;
  color: var(--ab-accent);
  flex-shrink: 0;
  margin-top: 0.15rem;
}

.press-content h3 {
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ab-text);
  margin-bottom: 0.25rem;
}

.press-content p {
  font-size: 0.85rem !important;
  margin: 0 !important;
}

.press-date {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  color: var(--ab-text-muted);
  font-weight: 500;
}

/* ── CTA Banner ── */
.cta-banner {
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 16px;
  padding: 2.5rem;
  text-align: center;
  margin-top: 3rem;
}

.cta-banner h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ab-text);
  margin-bottom: 0.75rem;
}

.cta-banner p {
  max-width: 500px;
  margin: 0 auto 1.5rem !important;
  font-size: 0.95rem !important;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.cta-btn-primary {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: var(--ab-accent);
  color: #fff !important;
  text-decoration: none !important;
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s;
  border-bottom: none !important;
}

.cta-btn-primary:hover {
  background: var(--ab-accent-hover);
}

.cta-btn-secondary {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: transparent;
  color: var(--ab-text) !important;
  text-decoration: none !important;
  border: 1.5px solid var(--ab-border);
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

.cta-btn-secondary:hover {
  border-color: var(--ab-accent);
}

/* ── License Badge ── */
.license-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-border);
  border-radius: 8px;
  padding: 0.75rem 1.25rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ab-text-muted);
  margin-top: 1rem;
}

.license-badge i {
  color: var(--ab-accent);
}

/* ── Timeline ── */
.timeline {
  position: relative;
  padding-left: 2rem;
  margin: 1.5rem 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0.45rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--ab-border);
}
.timeline-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 1rem;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.85rem;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ab-border);
  border: 2px solid var(--ab-bg);
}
.timeline-current::before {
  background: var(--ab-accent);
  box-shadow: 0 0 0 4px rgba(165, 28, 48, 0.15);
}
.timeline-year {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ab-accent);
  margin-bottom: 0.25rem;
}
.timeline-content h3 {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ab-text);
  margin: 0 0 0.3rem;
}
.timeline-content p {
  font-size: 0.9rem !important;
  line-height: 1.6 !important;
  margin: 0 !important;
}
.timeline-content a {
  color: var(--ab-accent);
  text-decoration: none;
}
.timeline-content a:hover {
  text-decoration: underline;
}

/* ── People Group Labels ── */
.people-group-label {
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ab-text-muted);
  margin: 2rem 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--ab-border);
}
.people-group-label:first-of-type {
  margin-top: 1rem;
}

/* ── Team Bio (People page) ── */
.team-bio {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem !important;
  line-height: 1.5 !important;
  color: var(--ab-text-muted);
  margin-top: 0.5rem;
}

.team-grid-wide {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* ── Compact Team Card (Research Contributors) ── */
.team-card-compact {
  padding: 1rem;
}

.team-card-compact img {
  width: 56px;
  height: 56px;
}

.team-card-compact h3 {
  font-size: 0.85rem;
}

/* ── Contributor Table (Contributors page) ── */
.contributors-table {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 1rem;
}

.contributor-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  text-decoration: none !important;
  border-bottom: 1px solid var(--ab-border);
  transition: background 0.15s;
}

.contributor-row:hover {
  background: var(--ab-card-bg);
}

.contributor-row img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid var(--ab-border);
  flex-shrink: 0;
}

.contributor-info {
  flex: 1;
  min-width: 0;
}

.contributor-name {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ab-text);
  display: block;
}

.contributor-handle {
  font-family: 'Inter', sans-serif;
  font-size: 0.75rem;
  color: var(--ab-text-muted);
}

.contributor-count {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ab-accent);
  flex-shrink: 0;
  min-width: 3rem;
  text-align: right;
}

/* ── Compact Avatar Grid (Working Group, Research) ── */
.compact-avatar-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.compact-avatar {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none !important;
  color: inherit !important;
  width: 72px;
  transition: transform 0.2s;
}

.compact-avatar:hover {
  transform: translateY(-3px);
}

.compact-avatar img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--ab-border);
  transition: border-color 0.2s;
}

.compact-avatar:hover img {
  border-color: var(--ab-accent);
}

.compact-name {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--ab-text-muted);
  margin-top: 0.35rem;
  text-align: center;
  line-height: 1.2;
  max-width: 72px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.compact-avatar:hover .compact-name {
  color: var(--ab-accent);
}

/* ── Contributors Mosaic (circle grid) ── */
.contributors-mosaic {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.contributor-circle {
  position: relative;
  display: inline-block;
  text-decoration: none !important;
  transition: transform 0.2s;
}

.contributor-circle:hover {
  transform: scale(1.15);
  z-index: 2;
}

.contributor-circle img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--ab-border);
  transition: border-color 0.2s;
}

.contributor-circle:hover img {
  border-color: var(--ab-accent);
}

.contributor-badge {
  position: absolute;
  bottom: -2px;
  right: -2px;
  background: var(--ab-accent);
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 0.1rem 0.35rem;
  border-radius: 8px;
  line-height: 1.2;
  min-width: 18px;
  text-align: center;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .about-hero {
    padding: 4rem 1.5rem 2rem;
  }

  .about-section {
    padding: 0 1.5rem;
  }

  .stats-strip {
    gap: 1.5rem;
  }

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

  .pillar-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .team-grid {
    grid-template-columns: 1fr;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}