/* ============================================
   Lectures, Courses & Study Toolkit Styles
   ============================================ */

.lectures-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--sp-6);
}

.lecture-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--dur-normal) cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.lecture-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--clr-accent);
}

.lecture-card.is-starred {
  border-left: 4px solid var(--clr-accent);
}

.lecture-card.is-reviewed {
  opacity: 0.92;
}

.lecture-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--sp-3);
}

.star-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  transition: transform var(--dur-fast);
}

.star-btn:hover {
  transform: scale(1.25);
}

.lecture-date {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.lecture-title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--clr-text);
  margin-bottom: var(--sp-1);
  line-height: 1.3;
}

.lecture-prof {
  font-size: var(--fs-xs);
  color: var(--clr-text-light);
  margin-bottom: var(--sp-3);
}

.lecture-summary {
  font-size: var(--fs-xs);
  color: var(--clr-text-light);
  line-height: 1.5;
  margin-bottom: var(--sp-4);
  background: var(--clr-cream);
  padding: var(--sp-3);
  border-radius: var(--radius-md);
}

.lecture-takeaways {
  font-size: var(--fs-xs);
  margin-bottom: var(--sp-4);
}

.lecture-takeaways strong {
  display: block;
  margin-bottom: 4px;
  color: var(--clr-text);
}

.lecture-takeaways ul {
  padding-left: var(--sp-4);
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--clr-text-light);
}

.lecture-card__footer {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--sp-4);
  border-top: 1px solid var(--clr-border);
}

/* Flashcard 3D hover effects */
.flashcard-box:hover {
  border-color: var(--clr-accent) !important;
  box-shadow: 0 8px 24px rgba(232, 168, 56, 0.2) !important;
}

/* Smooth Page Transitions */
.page {
  animation: pageFadeIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes pageFadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}