/*  1. LESSONS GRID LAYOUT (Handled by .carousel-grid in base.css) */

/*  2. LESSON CARD */
.lesson-card {
  display: flex;
  flex-direction: column;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  transition: 
    border-color var(--t-base),
    transform var(--t-base),
    box-shadow var(--t-base);
  height: 420px;
}

.lesson-card:hover {
  border-color: var(--border-h);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.08);
}

html.dark .lesson-card:hover {
  box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.5);
}

/*  3. CARD CONTENT */
.lesson-card__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.lesson-card__tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background-color: var(--surface2);
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
}

.lesson-card__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--text-s);
  transition: color var(--t-fast);
}

.lesson-card:hover .lesson-card__title {
  color: var(--accent);
}

.lesson-card__excerpt {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 2rem;
  flex-grow: 1;
  /* Truncate at 5 lines and maintain height */
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: calc(1.75 * 0.9375rem * 5);
}

/*  4. "READ LESSON" LINK */
.lesson-card__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-s);
}

.lesson-card__link svg {
  transition: transform var(--t-base);
}

.lesson-card:hover .lesson-card__link svg {
  transform: translateX(4px);
}

/*  5. RESPONSIVE */
@media (max-width: 640px) {
  .lessons-grid {
    grid-template-columns: 1fr;
  }
  
  .lesson-card {
    padding: 1.5rem;
  }
}

/*  6. MISC ACTIONS */
.section-actions {
  margin-top: 4rem;
  text-align: center;
}

/*  7. LOCKED STATE */
.lesson-locked {
  background-color: var(--surface2) !important;
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}