/* Header responsive classes */
.lib-header-row {
  margin-top: 8px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.lib-header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

.lib-header-actions .md-btn {
  position: relative;
  gap: 6px;
}

.filter-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--md-primary);
}

/* M3 Tabs Navigation & Header Row */
.subj-tabs-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--md-outline-variant);
  margin-bottom: 20px;
  gap: 16px;
}

.subj-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  margin-bottom: -1px;
}

.subj-tabs::-webkit-scrollbar {
  display: none;
}

.subj-tab-btn {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  font-family: var(--md-font);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--md-on-surface-variant);
  padding: 12px 16px;
  cursor: pointer;
  transition: all 150ms ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  flex-shrink: 0;
}

.subj-tab-btn:hover {
  color: var(--md-primary);
  background: rgba(0, 74, 198, 0.04);
  text-decoration: none;
}

.subj-tab-btn.active {
  color: var(--md-primary);
  border-bottom-color: var(--md-primary);
}

.subj-tab-btn .material-symbols-outlined {
  font-size: 20px;
}

.ix-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.ix-tab-icon {
  font-size: 18px;
}

@media (max-width: 420px) {
  .subj-tab-btn {
    padding: 10px 12px;
    font-size: 0.875rem;
  }
}

/* Accordion styles for Syllabus Categories */
.chapters-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chapter-section {
  background: var(--md-surface-container-lowest);
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-radius-md);
  overflow: hidden;
}

.chapter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--md-surface-container-low);
  cursor: pointer;
  user-select: none;
}

.chapter-header h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin: 0;
}

.chapter-badge {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--md-radius-full);
}

.chapter-content {
  padding: 20px;
  border-top: 1px solid var(--md-outline-variant);
  display: none;
}

.chapter-section.open .chapter-content {
  display: block;
}

.chapter-header .expand-icon {
  transition: transform 200ms ease;
}

.chapter-section.open .chapter-header .expand-icon {
  transform: rotate(180deg);
}

/* Sort & Filter Controls Bar */
.lib-sort-controls {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.lib-filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border-radius: var(--md-radius-full, 9999px);
  border: 1px solid var(--md-outline-variant, #cbd5e1);
  background: var(--md-surface-container-low, #f8fafc);
  color: var(--md-on-surface, #0f172a);
  font-family: var(--md-font);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 180ms ease;
  user-select: none;
  outline: none;
}

.lib-filter-btn:hover {
  background: var(--md-surface-container-high, #e2e8f0);
  border-color: var(--md-primary, #2563eb);
  color: var(--md-primary, #2563eb);
}

.lib-filter-btn.has-badge {
  background: var(--md-primary-container, #dbeafe);
  color: var(--md-on-primary-container, #1e40af);
  border-color: var(--md-primary, #2563eb);
}

.lib-filter-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 9999px;
  background: var(--md-primary, #2563eb);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
}

.lib-sort-select-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--md-radius-full, 9999px);
  border: 1px solid var(--md-outline-variant, #cbd5e1);
  background: var(--md-surface-container-low, #f8fafc);
  transition: all 150ms ease;
}

.lib-sort-select-wrapper:hover {
  border-color: var(--md-primary, #2563eb);
  background: var(--md-surface-container-high, #e2e8f0);
}

.lib-sort-select-wrapper .sort-label {
  font-size: 0.8125rem;
  color: var(--md-on-surface-variant, #64748b);
  font-weight: 500;
}

.lib-sort-select {
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--md-font);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--md-primary, #2563eb);
  cursor: pointer;
  padding: 2px 20px 2px 2px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24'%3E%3Cpath fill='%232563eb' d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right center;
}

/* Filter Dialog Styling */
.lib-filter-dialog {
  max-width: 540px;
  width: 92%;
  padding: 0 !important;
  border-radius: 28px !important;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25) !important;
  background: var(--md-surface-container-lowest, #ffffff);
}

.lib-filter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--md-outline-variant, #e2e8f0);
}

.lib-filter-header h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--md-on-surface, #0f172a);
  display: flex;
  align-items: center;
  gap: 8px;
}

.lib-filter-header .md-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 9999px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--md-on-surface-variant, #64748b);
  cursor: pointer;
  transition: all 150ms ease;
  user-select: none;
}

.lib-filter-header .md-icon-btn:hover {
  background: var(--md-surface-container-high, #e2e8f0);
  color: var(--md-on-surface, #0f172a);
}

.lib-filter-body {
  padding: 20px 24px;
  max-height: 60vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.filter-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--md-on-surface-variant, #64748b);
  margin-bottom: 10px;
}

.filter-chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 9999px;
  border: 1px solid var(--md-outline-variant, #cbd5e1);
  background: var(--md-surface, #ffffff);
  color: var(--md-on-surface-variant, #334155);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 150ms ease;
  user-select: none;
  outline: none;
}

.filter-chip-btn:hover {
  background: var(--md-surface-container-high, #f1f5f9);
  border-color: var(--md-primary, #2563eb);
}

.filter-chip-btn.active {
  background: var(--md-secondary-container, #dbeafe);
  color: var(--md-on-secondary-container, #1e40af);
  border-color: var(--md-primary, #2563eb);
  font-weight: 600;
}

.filter-chip-btn .check-icon {
  font-size: 16px;
  display: none;
}

.filter-chip-btn.active .check-icon {
  display: inline-block;
}

.lib-filter-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--md-surface-container-low, #f8fafc);
  border-top: 1px solid var(--md-outline-variant, #e2e8f0);
}

.lib-filter-footer .md-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 22px;
  border-radius: 9999px;
  font-family: var(--md-font);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all 150ms ease;
  user-select: none;
  text-decoration: none;
}

.lib-filter-footer .md-btn-text {
  background: transparent;
  color: var(--md-primary, #2563eb);
}

.lib-filter-footer .md-btn-text:hover {
  background: var(--md-surface-container-high, #e2e8f0);
}

.lib-filter-footer .md-btn-filled {
  background: var(--md-primary, #2563eb);
  color: #ffffff;
  box-shadow: none;
}

.lib-filter-footer .md-btn-filled:hover {
  background: #1d4ed8;
  box-shadow: none;
}

/* Coming soon card */
.lib-coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px 20px;
  background: var(--md-surface-container);
  border: 2px dashed var(--md-outline-variant);
  border-radius: var(--md-radius-lg);
  min-height: 200px;
}

.lib-coming-soon-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--md-surface-container-high);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}

.lib-coming-soon-icon .material-symbols-outlined {
  font-size: 28px;
  color: var(--md-primary);
}

.lib-coming-soon h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--md-on-surface);
  margin-bottom: 4px;
}

.lib-coming-soon p {
  font-size: 0.8125rem;
  color: var(--md-on-surface-variant);
  max-width: 240px;
}

/* Pagination */
.lib-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
}

.lib-pagination a,
.lib-pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  border-radius: var(--md-radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 150ms ease, color 150ms ease;
}

.lib-pagination a {
  color: var(--md-on-surface-variant);
  border: 1px solid var(--md-outline-variant);
}

.lib-pagination a:hover {
  background: var(--md-surface-container-high);
  text-decoration: none;
}

.lib-pagination .current {
  background: var(--md-primary);
  color: var(--md-on-primary);
  border: none;
}

.lib-pagination .dots {
  color: var(--md-on-surface-variant);
  border: none;
  min-width: 32px;
}

.lib-pagination .disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* Responsive breakpoints */
@media (max-width: 600px) {
  .lib-header-row {
    flex-wrap: wrap;
    gap: 12px;
  }

  .lib-header-row h1 {
    font-size: 1.5rem;
  }

  .md-btn-text-responsive {
    display: none;
  }

  .lib-header-actions .md-btn {
    min-width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    gap: 0;
    border-radius: 50%;
  }

  .lib-header-actions .md-btn .material-symbols-outlined {
    margin: 0;
  }

  .lib-header-actions button .filter-dot {
    position: absolute;
    top: 8px;
    right: 8px;
  }

  .subj-tabs-header {
    flex-wrap: wrap;
    gap: 8px;
  }
}