/* ============================================================
   LECTURES PAGE — lectures.css
   ============================================================ */

/* ── Active nav link ── */
.active-nav {
  color: var(--amber-text) !important; /* #7A5C1E: 4.93:1 on beige header — passes AA */
}
.active-nav::after {
  width: 100% !important;
}

/* ============================================================
   PAGE HERO
   ============================================================ */
.page-hero {
  background: linear-gradient(160deg, var(--amber-pale) 0%, var(--beige) 100%);
  padding: 9rem 0 4rem;
  text-align: center;
  border-bottom: 1px solid var(--beige-deeper);
}

.page-hero-title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  color: var(--brown);
  margin: 0.5rem 0 1rem;
  line-height: 1.15;
}

.page-hero-desc {
  font-size: 1.1rem;
  color: var(--text-soft);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================================
   TABS
   ============================================================ */
.lectures-tabs-section {
  padding: 2.5rem 0 0;
  background: var(--white);
}

.lectures-tabs {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: center;
}

.tab-btn {
  background: var(--beige);
  border: 1.5px solid var(--beige-deeper);
  color: var(--text-soft);
  font-family: 'Heebo', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.5rem 1.4rem;
  border-radius: 50px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.tab-btn:hover {
  background: var(--amber-pale);
  border-color: var(--amber-accessible);
  color: var(--amber-accessible);
}
.tab-btn.active {
  background: var(--amber-accessible); /* 4.91:1 vs white — passes AA */
  border-color: var(--amber-accessible);
  color: var(--white);
  font-weight: 600;
}

/* ============================================================
   LECTURES GRID
   ============================================================ */
.lectures-grid-section {
  padding: 2.5rem 0 5rem;
  background: var(--white);
}

.lectures-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

/* ── Lecture Card ── */
.lecture-card {
  background: var(--beige);
  border: 1px solid var(--beige-deeper);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}
.lecture-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.lecture-card.hidden {
  display: none;
}

/* ── Thumbnail ── */
.lecture-thumb-link {
  display: block;
}

.lecture-thumb {
  height: 210px;
  position: relative;
  overflow: hidden;
}

/* Overlay shown on hover */
.lecture-thumb-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.38);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.lecture-thumb:hover .lecture-thumb-overlay,
.lecture-card:hover .lecture-thumb-overlay {
  opacity: 1;
}

/* Play button for past lectures */
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--brown);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  padding-right: 2px; /* optical centre for triangle */
  transition: background var(--transition), transform var(--transition);
}
.lecture-thumb:hover .play-icon {
  background: var(--white);
  transform: scale(1.12);
}

/* Ticket button for upcoming lectures */
.btn-ticket {
  background: var(--amber-accessible); /* 4.91:1 vs white — passes AA */
  color: var(--white);
  font-family: 'Heebo', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.65rem 1.6rem;
  border-radius: 50px;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  white-space: nowrap;
}
.btn-ticket:hover {
  background: var(--green); /* --amber-light gives only 1.89:1 with white text */
  transform: scale(1.05);
}

/* Badge */
.lecture-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.8rem;
  border-radius: 50px;
  z-index: 1;
}
.past-badge {
  background: rgba(90, 112, 71, 0.88);
  color: var(--white);
}
.upcoming-badge {
  background: var(--amber-accessible); /* 4.91:1 vs white — passes AA */
  color: var(--white);
}

/* Placeholder image gradients — past */
.lecture-thumb--past-1 { background: linear-gradient(135deg, #6b4f2e 0%, #8b5e3c 60%, #c8933a 100%); }
.lecture-thumb--past-2 { background: linear-gradient(135deg, #3a5c3a 0%, #5a7047 60%, #7a9462 100%); }
.lecture-thumb--past-3 { background: linear-gradient(135deg, #5a3050 0%, #8b5e7c 60%, #c8839a 100%); }
.lecture-thumb--past-4 { background: linear-gradient(135deg, #2e4a6b 0%, #4a6a8b 60%, #7aa0c8 100%); }

/* Placeholder image gradients — upcoming */
.lecture-thumb--upcoming-1 { background: linear-gradient(135deg, #c8933a 0%, #e8b05a 60%, #fbf0d9 100%); }
.lecture-thumb--upcoming-2 { background: linear-gradient(135deg, #5a7047 0%, #7a9462 60%, #eaf0e5 100%); }

/* ── Card body ── */
.lecture-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  flex: 1;
}

.lecture-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.lecture-type-tag {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  padding: 0.2rem 0.7rem;
  border-radius: 50px;
}
.type--past     { background: #e8f0e8; color: #3a6b3a; }
.type--upcoming { background: #fdf3e0; color: #8a5c00; }

.lecture-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.lecture-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text);
}

.lecture-location {
  font-size: 0.85rem;
  color: var(--text-soft);
  display: flex;
  align-items: flex-start;
  gap: 0.3rem;
}
.loc-icon {
  flex-shrink: 0;
  line-height: 1.5;
}

.lecture-desc {
  font-size: 0.9rem;
  color: var(--text-soft);
  line-height: 1.7;
  flex: 1;
}

/* CTA links */
.btn-watch,
.btn-ticket-full {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--beige-deeper);
  transition: color var(--transition), gap var(--transition);
}
.btn-watch {
  color: var(--green);
}
.btn-watch:hover {
  color: var(--amber-accessible);
  gap: 0.6rem;
}
.btn-ticket-full {
  color: var(--amber-text); /* #7A5C1E: 6.07:1 on white — passes AA */
}
.btn-ticket-full:hover {
  color: var(--green);
  gap: 0.6rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .lectures-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .page-hero { padding: 8rem 0 3rem; }

  .lectures-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 560px) {
  .lectures-grid {
    grid-template-columns: 1fr;
  }

  .lectures-tabs {
    gap: 0.4rem;
  }
  .tab-btn {
    font-size: 0.82rem;
    padding: 0.45rem 1rem;
  }
}