/**
 * ============================================================================
 * TOPICAL PAPERS STYLES
 * ============================================================================
 * 
 * Clean, modern styling for topical questions display
 * Question cards with topic badges, difficulty levels, and metadata
 * ============================================================================
 */

/* ==================== LAYOUT ==================== */

.topical-compact-layout,
.topical-full-layout {
  width: 100%;
  min-height: 400px;
}

.topical-full-layout {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* ==================== TOP BAR ==================== */

.topical-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.topical-info h2 {
  margin: 0 0 var(--spacing-xs) 0;
  color: var(--text-dark);
  font-size: var(--font-size-2xl);
}

.questions-count {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.top-bar-actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-wrap: wrap;
}

/* ==================== MAIN AREA ==================== */

.topical-main-area {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-lg);
}

/* ==================== TOPIC SELECTOR ==================== */

.topical-topic-selector {
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
    margin-top: 1rem;
}

.topical-topic-selector label {
  font-weight: 600;
  color: var(--text-dark);

}

.topic-select {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  background: var(--surface);
  color: var(--text-dark);
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: var(--font-family);
  width: max-content;
}

.topic-select:hover {
  border-color: var(--primary-light);
}

.topic-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(232, 17, 35, 0.1);
}

/* ==================== QUICK FILTERS ==================== */

.topical-quick-filters {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.quick-filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  background: var(--surface);
  color: var(--text-dark);
  cursor: pointer;
  transition: all var(--transition-base);
}

.quick-filter-select:hover {
  border-color: var(--primary-light);
}

/* ==================== FILTERS SIDEBAR ==================== */

.topical-filters-sidebar {
  background: var(--surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  height: fit-content;
  position: sticky;
  top: var(--spacing-lg);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.filters-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--border-color);
}

.filters-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn-clear {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
}

.btn-clear:hover {
  background: var(--primary-color);
  color: white;
}

.filter-group {
  margin-bottom: var(--spacing-xl);
}

.filter-group h4 {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-base);
  color: var(--text-dark);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: var(--font-size-sm);
}

.filter-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.filter-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
}

.filter-option:hover {
  background: var(--background);
}

.filter-option input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--primary-color);
}

.filter-option span {
  flex: 1;
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

.filter-option .count {
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  font-weight: 600;
  background: var(--background);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.filter-option i {
  font-size: var(--font-size-base);
}

/* Topic options with colors */
.topic-option i {
  width: 20px;
  text-align: center;
}

/* ==================== QUESTIONS GRID ==================== */

.topical-display-area {
  flex: 1;
}

.questions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== QUESTION CARDS ==================== */

.question-card {
  background: var(--surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  min-height: 250px;
}

.question-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.question-card.unavailable {
  opacity: 0.6;
  cursor: not-allowed;
}

.question-card.unavailable:hover {
  transform: none;
  box-shadow: none;
}

/* Question Header */
.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
}

.question-number {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.question-marks {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* Topic Badge */
.question-topic {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.question-topic i {
  font-size: var(--font-size-base);
}

/* Difficulty Badge */
.question-difficulty {
  margin: var(--spacing-xs) 0;
}

.difficulty-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.difficulty-badge.easy {
  background: #d1fae5;
  color: #065f46;
}

.difficulty-badge.medium {
  background: #fed7aa;
  color: #92400e;
}

.difficulty-badge.hard {
  background: #fecaca;
  color: #991b1b;
}

/* Source Info */
.question-source {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.question-source i {
  color: var(--primary-color);
}

.separator {
  color: var(--border-color);
}

/* Tags */
.question-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  background: var(--background);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* Question Preview */
.question-preview {
  flex: 1;
  margin: var(--spacing-sm) 0;
  padding: var(--spacing-md);
  background: var(--background);
  border-radius: var(--radius-md);
  color: var(--text-dark);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  overflow: hidden;
  max-height: 300px;
  position: relative;
}

.question-preview::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--background));
  pointer-events: none;
}

/* Hide extra metadata in preview */
.question-preview .question-metadata,
.question-preview .question-header {
  display: none !important;
}

/* Compact question parts in preview */
.question-preview .question-part {
  margin-bottom: var(--spacing-xs);
}

.question-preview .part-label {
  font-weight: 600;
  color: var(--primary-color);
}

.question-preview img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin: var(--spacing-xs) 0;
}

/* Footer */
.question-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--border-color);
  margin-top: auto;
  flex-shrink: 0;
}

.question-difficulty {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: capitalize;
}

.question-difficulty.easy {
  background: #d1fae5;
  color: #065f46;
}

.question-difficulty.medium {
  background: #fed7aa;
  color: #92400e;
}

.question-difficulty.hard {
  background: #fecaca;
  color: #991b1b;
}

.question-source {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.question-indicators {
  display: flex;
  gap: var(--spacing-sm);
  color: var(--text-muted);
  font-size: var(--font-size-base);
}

.question-indicators i {
  transition: color var(--transition-base);
}

.question-indicators i:hover {
  color: var(--primary-color);
}

.btn-view-question {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-base);
}

.btn-view-question:hover {
  background: var(--primary-dark);
  transform: translateX(2px);
}

/* ==================== QUESTION MODAL ==================== */

.question-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: var(--spacing-lg);
  animation: fadeIn 0.2s ease-out;
}

.question-modal {
  background: var(--background);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  max-width: 1200px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  padding: var(--spacing-xl);
  border-bottom: 2px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.modal-title-area {
  flex: 1;
}

.modal-title-area h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-2xl);
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.marks-badge {
  background: var(--primary-color);
  color: white;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.btn-close {
  background: var(--background);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.btn-close:hover {
  background: var(--primary-color);
  color: white;
}

.modal-body {
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Question Image Display */
.modal-question-image {
  width: 100%;
  background: var(--background);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  border: 2px solid var(--border-color);
}

.modal-question-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.modal-question-image img:hover {
  transform: scale(1.02);
}

.image-hint {
  margin-top: var(--spacing-md);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  font-style: italic;
}

.image-hint i {
  margin-right: var(--spacing-xs);
  color: var(--primary-color);
}

/* Question Placeholder (when no image) */
.modal-question-placeholder {
  width: 100%;
  background: var(--background);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-3xl);
  text-align: center;
  color: var(--text-muted);
}

.placeholder-icon {
  font-size: 4rem;
  color: var(--border-color);
  margin-bottom: var(--spacing-md);
}

.modal-question-placeholder p {
  margin: var(--spacing-sm) 0;
  font-size: var(--font-size-lg);
  color: var(--text-dark);
}

.modal-question-placeholder small {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* Image Load Error */
.image-error {
  padding: var(--spacing-2xl);
  text-align: center;
  color: #991b1b;
  background: #fee2e2;
  border-radius: var(--radius-md);
}

.image-error i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.image-error p {
  margin: 0;
  font-weight: 600;
}

.modal-topic {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: none;
  align-items: center;
  gap: var(--spacing-md);
}

.modal-topic i {
  font-size: var(--font-size-2xl);
}

.modal-topic strong {
  display: block;
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

.modal-topic p {
  margin: 0;
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

.modal-source {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.source-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

.source-item i {
  color: var(--primary-color);
}

.modal-tags {
  padding: var(--spacing-md);
  background: var(--background);
  border-radius: var(--radius-md);
  display: none;
}

.modal-tags strong {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.modal-actions {
  padding: var(--spacing-xl);
  border-top: 2px solid var(--border-color);
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.btn-modal {
  flex: 1;
  min-width: 150px;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: all var(--transition-base);
}

.btn-modal i {
  font-size: var(--font-size-lg);
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--background);
  color: var(--text-dark);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--surface);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-solution {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: white;
}

.btn-solution:hover {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-disabled {
  background: var(--background);
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.5;
}

/* ==================== GROUPED QUESTIONS ==================== */

.questions-grouped-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.question-group-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.group-section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-dark);
  padding-bottom: var(--spacing-sm);
  border-bottom: 3px solid var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.group-section-count {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-muted);
}

/* ==================== EMPTY STATE ==================== */

.empty-state {
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
  color: var(--text-muted);
}

.empty-icon {
  font-size: 4rem;
  color: var(--border-color);
  margin-bottom: var(--spacing-lg);
}

.empty-state h3 {
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--text-dark);
  font-size: var(--font-size-xl);
}

.empty-state p {
  margin: 0 0 var(--spacing-lg) 0;
  color: var(--text-muted);
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 968px) {
  .topical-main-area {
    grid-template-columns: 1fr;
  }

  .topical-filters-sidebar {
    position: static;
    max-height: none;
  }

  .questions-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
}

@media (max-width: 640px) {
  .topical-top-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .top-bar-actions {
    flex-direction: column;
  }

  .questions-grid {
    grid-template-columns: 1fr;
  }

  .modal-actions {
    flex-direction: column;
  }

  .btn-modal {
    width: 100%;
  }
}

/* ==================== FULLSCREEN IMAGE OVERLAY ==================== */

.fullscreen-image-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10001;
  padding: var(--spacing-xl);
  animation: fadeIn 0.2s ease-out;
  cursor: pointer;
}

.fullscreen-image-container {
  position: relative;
  max-width: 95vw;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.fullscreen-image-container img {
  max-width: 100%;
  max-height: 85vh;
  height: auto;
  width: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  cursor: default;
}

.btn-close-fullscreen {
  position: absolute;
  top: -50px;
  right: 0;
  background: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-dark);
  font-size: var(--font-size-lg);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.btn-close-fullscreen:hover {
  background: var(--primary-color);
  color: white;
}

.fullscreen-hint {
  color: white;
  font-size: var(--font-size-sm);
  opacity: 0.7;
  margin: 0;
}

/* Mobile adjustments for fullscreen */
@media (max-width: 640px) {
  .fullscreen-image-container img {
    max-height: 80vh;
  }
  
  .btn-close-fullscreen {
    top: -40px;
    width: 35px;
    height: 35px;
  }
}

/* ==================== MARK SCHEME SECTION ==================== */

.modal-markscheme-section {
  margin-top: var(--spacing-lg);
  border-top: 2px solid var(--border-color);
  padding-top: var(--spacing-lg);
}

.btn-toggle-markscheme {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-base);
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
}

.btn-toggle-markscheme:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
  transform: translateY(-2px);
}

.btn-toggle-markscheme:active {
  transform: translateY(0);
}

.btn-toggle-markscheme.active {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.2);
}

.btn-toggle-markscheme.active:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
}

.btn-toggle-markscheme i:first-child {
  font-size: var(--font-size-lg);
}

.btn-toggle-markscheme span {
  flex: 1;
  text-align: left;
  margin-left: var(--spacing-md);
}

.toggle-icon {
  font-size: var(--font-size-sm);
  transition: transform var(--transition-base);
}

.markscheme-content {
  margin-top: var(--spacing-lg);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    max-height: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    max-height: 2000px;
    transform: translateY(0);
  }
}

.markscheme-image-container {
  background: #f0fdf4;
  border: 2px solid #86efac;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.markscheme-image-container img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.markscheme-image-container img:hover {
  transform: scale(1.02);
}

.markscheme-image-container .image-hint {
  margin-top: var(--spacing-md);
  color: #15803d;
  font-size: var(--font-size-sm);
  font-style: italic;
}

.markscheme-image-container .image-hint i {
  color: #16a34a;
}

/* Mobile responsive for mark scheme */
@media (max-width: 640px) {
  .btn-toggle-markscheme {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
  
  .markscheme-image-container {
    padding: var(--spacing-md);
  }
}

/* ==================== PDF DOWNLOAD BUTTON ==================== */

.btn-download-pdf {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: all var(--transition-base);
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
  white-space: nowrap;
}

.btn-download-pdf:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
  transform: translateY(-2px);
}

.btn-download-pdf:active {
  transform: translateY(0);
}

.btn-download-pdf i {
  font-size: var(--font-size-base);
}

/* PDF Loading Overlay */
.pdf-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10002;
  animation: fadeIn 0.2s ease-out;
}

.pdf-loading-content {
  background: white;
  padding: var(--spacing-3xl);
  border-radius: var(--radius-lg);
  text-align: center;
  max-width: 400px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.pdf-loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid #f3f4f6;
  border-top-color: #dc2626;
  border-radius: 50%;
  margin: 0 auto var(--spacing-lg);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.pdf-loading-content h3 {
  font-size: var(--font-size-xl);
  color: var(--text-dark);
  margin: 0 0 var(--spacing-sm);
  font-weight: 700;
}

.pdf-loading-content p {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin: 0;
}

/* Mobile responsive */
@media (max-width: 640px) {
  .btn-download-pdf {
    width: 100%;
    justify-content: center;
    margin-top: var(--spacing-sm);
  }
  
  .topical-quick-filters {
    flex-wrap: wrap;
  }
}

/* ==================== DOWNLOAD MODAL ==================== */

.download-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 10000;
  animation: fadeIn 0.2s ease-out;
  padding: 0;
}

@media (min-width: 640px) {
  .download-modal-overlay {
    align-items: center;
    padding: var(--spacing-lg);
  }
}

.download-modal {
  background: white;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.3s ease-out;
}

@media (min-width: 640px) {
  .download-modal {
    border-radius: var(--radius-xl);
    max-height: 85vh;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Modal Header */
.download-modal .modal-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  background: white;
  z-index: 10;
}

.download-modal .modal-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
}

.download-modal .modal-header.success h3 {
  color: #10b981;
}

.download-modal .modal-header.error h3 {
  color: #dc2626;
}

/* Modal Content */
.download-modal .modal-content {
  padding: var(--spacing-xl);
}

/* Download Info */
.download-info {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.info-badge {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.info-stats {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* Includes Section */
.download-includes {
  background: #f9fafb;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.includes-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-muted);
  margin: 0 0 var(--spacing-md) 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.includes-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.include-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-base);
  color: var(--text-dark);
}

.include-item i {
  color: #10b981;
  font-size: var(--font-size-lg);
}

/* Loading State */
.modal-loading {
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid #f3f4f6;
  border-top-color: #dc2626;
  border-radius: 50%;
  margin: 0 auto var(--spacing-xl);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-message {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-lg);
}

/* Progress Steps */
.progress-steps {
  margin: var(--spacing-xl) 0;
  text-align: left;
  max-width: 300px;
  margin-left: auto;
  margin-right: auto;
}

.progress-step {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
  color: #10b981;
}

.progress-step i {
  width: 20px;
  text-align: center;
}

.progress-step.active {
  color: #f59e0b;
}

/* Success State */
.modal-success {
  padding: var(--spacing-xl);
}

.success-file {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: #f0fdf4;
  border: 2px solid #86efac;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.success-file i {
  font-size: 2.5rem;
  color: #dc2626;
}

.file-info {
  flex: 1;
}

.file-info strong {
  display: block;
  font-size: var(--font-size-base);
  color: var(--text-dark);
  margin-bottom: var(--spacing-xs);
  word-break: break-all;
}

.file-info small {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.success-includes {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: #f9fafb;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

/* Modal Divider */
.modal-divider {
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    #e5e7eb 20%,
    #e5e7eb 80%,
    transparent
  );
  margin: var(--spacing-xl) 0;
}

/* CTA Sections */
.cta-section {
  text-align: center;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.cta-section .cta-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.cta-section h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 var(--spacing-sm) 0;
}

.cta-section p {
  font-size: var(--font-size-base);
  color: var(--text-muted);
  margin: 0 0 var(--spacing-lg) 0;
}

/* YouTube CTA */
.youtube-cta {
  background: #fef2f2;
  border: 2px solid #fecaca;
}

/* Tutoring CTA */
.tutoring-cta {
  background: #f0fdf4;
  border: 2px solid #bbf7d0;
}

/* Benefits List */
.benefits-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  text-align: left;
  max-width: 300px;
  margin-left: auto;
  margin-right: auto;
}

.benefit-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-dark);
}

.benefit-item i {
  color: #10b981;
}

/* CTA Buttons */
.cta-buttons {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

@media (min-width: 480px) {
  .cta-buttons {
    flex-direction: row;
    justify-content: center;
  }
}

/* Error State */
.modal-error {
  text-align: center;
  padding: var(--spacing-xl);
}

.error-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.modal-error h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-dark);
  margin: 0 0 var(--spacing-sm) 0;
}

.modal-error > p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.error-tips {
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.error-tips p {
  font-weight: 600;
  margin: 0 0 var(--spacing-sm) 0;
}

.error-tips ul {
  margin: 0;
  padding-left: var(--spacing-lg);
}

.error-tips li {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.error-contact {
  padding: var(--spacing-lg);
  background: #f0fdf4;
  border-radius: var(--radius-lg);
}

.error-contact p {
  margin: 0 0 var(--spacing-md) 0;
  font-size: var(--font-size-sm);
}

/* Modal Footer */
.modal-footer {
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid #e5e7eb;
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
  position: sticky;
  bottom: 0;
  background: white;
}

/* Modal Buttons */
.btn-modal {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  justify-content: center;
  white-space: nowrap;
}

.btn-modal i {
  font-size: var(--font-size-base);
}

.btn-modal.btn-primary {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
}

.btn-modal.btn-primary:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
  transform: translateY(-2px);
}

.btn-modal.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid #e5e7eb;
}

.btn-modal.btn-ghost:hover {
  background: #f9fafb;
  border-color: #d1d5db;
}

.btn-modal.btn-youtube {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.3);
  width: 100%;
  cursor: pointer;
}

.btn-modal.btn-youtube:hover {
  background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%);
  transform: translateY(-2px);
}

.btn-modal.btn-apprentus {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
  flex: 1;
}

.btn-modal.btn-apprentus:hover {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  transform: translateY(-2px);
}

.btn-modal.btn-whatsapp {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
  flex: 1;
}

.btn-modal.btn-whatsapp:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  transform: translateY(-2px);
}

/* Mobile Responsive */
@media (max-width: 640px) {
  .download-modal .modal-header,
  .download-modal .modal-content,
  .modal-footer {
    padding: var(--spacing-lg);
  }
  
  .modal-footer {
    flex-direction: column-reverse;
  }
  
  .btn-modal {
    width: 100%;
  }
  
  .cta-buttons {
    flex-direction: column;
  }
  
  .btn-modal.btn-apprentus,
  .btn-modal.btn-whatsapp {
    width: 100%;
  }
}

/* ==================== QUESTION PREVIEW IN CARDS (Structured Questions) ==================== */

.question-card-preview {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  background: var(--background);
  border-radius: var(--radius-md);
  max-height: 200px;
  overflow: hidden;
  position: relative;
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.question-card-preview::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--background));
}

.preview-stem {
  color: var(--text-dark);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.preview-diagram {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--primary-color);
  color: white;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  margin: var(--spacing-xs) 0;
}

.preview-diagram i {
  font-size: var(--font-size-sm);
}

.part-preview {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-md);
  color: var(--text-light);
  font-size: 0.875rem;
  line-height: 1.4;
}

.part-preview strong {
  color: var(--text-dark);
  font-weight: 600;
}

.part-marks {
  color: var(--text-muted);
  font-size: var(--font-size-xs);
  margin-left: var(--spacing-xs);
}

.nested-parts-preview {
  margin-top: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--surface);
  border-left: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-style: italic;
}

.more-parts-indicator {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--background-alt);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-style: italic;
  display: inline-block;
}

/* ==================== STRUCTURED QUESTION MODAL DISPLAY ==================== */

.modal-question-content {
  padding: var(--spacing-lg);
  background: var(--background);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

/* Mark Scheme Structured Content */
.markscheme-structured-content {
  padding: var(--spacing-lg);
}

.mark-scheme-parts {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.mark-scheme-part {
  padding: var(--spacing-md);
  background: var(--background);
  border-left: 4px solid var(--success-color);
  border-radius: var(--radius-md);
}

.mark-scheme-part .part-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.mark-scheme-part .part-header strong {
  color: var(--text-dark);
  font-size: var(--font-size-base);
}

.mark-scheme-part .part-marks {
  color: var(--success-color);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.acceptable-answers {
  margin: var(--spacing-md) 0;
}

.acceptable-answers strong {
  color: var(--text-dark);
  font-size: var(--font-size-sm);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.acceptable-answers ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.acceptable-answers li {
  padding: var(--spacing-xs) var(--spacing-sm);
  margin: var(--spacing-xs) 0;
  background: var(--surface);
  border-radius: var(--radius-sm);
  color: var(--text-dark);
  font-size: var(--font-size-sm);
}

.acceptable-answers li::before {
  content: '✓';
  color: var(--success-color);
  font-weight: bold;
  margin-right: var(--spacing-sm);
}

.marking-notes {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--warning-bg);
  border-left: 3px solid var(--warning-color);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--text-light);
}