/* ==========================================================================
   StudyMate AI - Chapters / Topics Library Styles (css/chapters.css)
   ========================================================================== */

.chapters-page-header {
  margin-bottom: var(--space-6);
}

.chapters-hero-banner {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.08) 0%, rgba(14, 165, 233, 0.06) 100%);
  border: 1px solid rgba(79, 70, 229, 0.15);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-5);
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.chapters-hero-info h1 {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: var(--space-1);
}

.chapters-hero-info p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin: 0;
}

.chapters-controls-bar {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
  .chapters-controls-bar {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.search-box-wrap {
  position: relative;
  flex: 1;
  max-width: 360px;
}

.search-box-input {
  width: 100%;
  height: 42px;
  padding: 8px 14px 8px 38px;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--border-color);
  background-color: var(--bg-card);
  font-size: var(--text-sm);
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.search-box-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.search-box-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.95rem;
  pointer-events: none;
}

/* Filter pills horizontal scroller */
.subject-filter-scroller {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.subject-filter-scroller::-webkit-scrollbar {
  display: none;
}

.filter-pill-btn {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.filter-pill-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.filter-pill-btn.active {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
}

/* Chapters Grid */
.chapters-catalog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

@media (min-width: 640px) {
  .chapters-catalog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .chapters-catalog-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Mobile responsive compact style */
@media (max-width: 640px) {
  .chapters-hero-banner {
    padding: 14px 16px;
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
  }

  .chapters-hero-info h1 {
    font-size: 1.25rem;
  }

  .chapters-hero-info p {
    font-size: 0.78rem;
  }

  .chapters-controls-bar {
    gap: 8px;
    margin-bottom: 12px;
  }

  .search-box-input {
    height: 38px;
    font-size: 0.82rem;
  }

  .filter-pill-btn {
    padding: 5px 12px;
    font-size: 0.72rem;
  }

  .chapters-catalog-grid {
    gap: 10px;
    margin-bottom: 16px;
  }
}