/* ============================================
   PDF Collator Styles
   ============================================ */

:root {
  /* Light Mode Colors */
  --pdf-bg-primary: #f8f9fa;
  --pdf-bg-secondary: #ffffff;
  --pdf-bg-tertiary: #f1f3f5;
  --pdf-border: #dee2e6;
  --pdf-text-primary: #212529;
  --pdf-text-secondary: #6c757d;
  --pdf-text-muted: #adb5bd;
  
  /* Accent Colors */
  --pdf-primary: #2196f3;
  --pdf-primary-hover: #1976d2;
  --pdf-success: #4caf50;
  --pdf-success-hover: #388e3c;
  --pdf-danger: #f44336;
  --pdf-danger-hover: #d32f2f;
  --pdf-warning: #ff9800;
  
  /* Date Highlighting */
  --pdf-date-highlight: #fff59d;
  --pdf-date-text: #f57c00;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
  :root {
    --pdf-bg-primary: #1a1a1a;
    --pdf-bg-secondary: #2d2d2d;
    --pdf-bg-tertiary: #3a3a3a;
    --pdf-border: #404040;
    --pdf-text-primary: #e0e0e0;
    --pdf-text-secondary: #b0b0b0;
    --pdf-text-muted: #808080;
    
    --pdf-primary: #64b5f6;
    --pdf-primary-hover: #42a5f5;
    --pdf-success: #81c784;
    --pdf-success-hover: #66bb6a;
    --pdf-danger: #e57373;
    --pdf-danger-hover: #ef5350;
    
    --pdf-date-highlight: #fdd835;
    --pdf-date-text: #ffb300;
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.5);
  }
}

/* ============================================
   Layout
   ============================================ */

#pdf-collator-app {
  min-height: 100vh;
  background: var(--pdf-bg-primary);
  color: var(--pdf-text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.app-header {
  background: var(--pdf-bg-secondary);
  border-bottom: 1px solid var(--pdf-border);
  padding: 1.5rem 2rem;
  text-align: center;
}

.app-header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 2rem;
  font-weight: 600;
}

.app-subtitle {
  margin: 0;
  color: var(--pdf-text-secondary);
  font-size: 1rem;
}

.app-container {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: 0;
  height: calc(100vh - 120px);
}

.source-panel,
.preview-panel {
  background: var(--pdf-bg-secondary);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.source-panel {
  border-right: 1px solid var(--pdf-border);
}

.panel-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--pdf-border);
  background: var(--pdf-bg-tertiary);
}

.panel-header h2 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

/* ============================================
   Upload Zone
   ============================================ */

.upload-zone {
  margin: 1.5rem;
  border: 2px dashed var(--pdf-border);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: var(--pdf-bg-tertiary);
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--pdf-primary);
  background: var(--pdf-bg-primary);
}

.upload-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.upload-icon {
  width: 48px;
  height: 48px;
  color: var(--pdf-text-muted);
}

.upload-text {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--pdf-text-primary);
}

.upload-subtext {
  margin: 0;
  font-size: 0.875rem;
  color: var(--pdf-text-secondary);
}

/* ============================================
   File List
   ============================================ */

.file-list-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.file-list-header {
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--pdf-border);
  background: var(--pdf-bg-tertiary);
}

#file-count {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--pdf-text-secondary);
}

.file-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  background: var(--pdf-bg-tertiary);
  border: 1px solid var(--pdf-border);
  border-radius: 6px;
  transition: all var(--transition-fast);
}

.file-item:hover {
  background: var(--pdf-bg-primary);
  box-shadow: var(--shadow-sm);
}

.file-icon {
  width: 40px;
  height: 40px;
  background: var(--pdf-primary);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-weight: 500;
  font-size: 0.875rem;
  margin: 0 0 0.25rem 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-meta {
  font-size: 0.75rem;
  color: var(--pdf-text-secondary);
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.doc-type-badge {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.doc-type-invoice {
  background: rgba(34, 139, 230, 0.15);
  color: #228be6;
}

.doc-type-ledger {
  background: rgba(82, 196, 26, 0.15);
  color: #52c41a;
}

.doc-type-1500 {
  background: rgba(250, 173, 20, 0.15);
  color: #faad14;
}

.doc-type-consent {
  background: rgba(114, 46, 209, 0.15);
  color: #722ed1;
}

.doc-type-soap {
  background: rgba(235, 47, 150, 0.15);
  color: #eb2f96;
}

.doc-type-unknown {
  background: rgba(128, 128, 128, 0.15);
  color: #808080;
}

.file-actions {
  display: flex;
  gap: 0.25rem;
}

/* ============================================
   Collation Controls
   ============================================ */

.collation-controls {
  padding: 1.5rem;
  background: var(--pdf-bg-tertiary);
  border-bottom: 1px solid var(--pdf-border);
  display: flex;
  gap: 1rem;
  align-items: flex-end;
}

.control-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--pdf-text-secondary);
}

.select-input {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--pdf-border);
  border-radius: 4px;
  background: var(--pdf-bg-secondary);
  color: var(--pdf-text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.select-input:hover {
  border-color: var(--pdf-primary);
}

.select-input:focus {
  outline: none;
  border-color: var(--pdf-primary);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* ============================================
   Progress Bar
   ============================================ */

.progress-container {
  padding: 1.5rem;
  background: var(--pdf-bg-tertiary);
  border-bottom: 1px solid var(--pdf-border);
}

.progress-bar {
  height: 8px;
  background: var(--pdf-border);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--pdf-primary);
  transition: width var(--transition-normal);
  width: 0%;
}

.progress-text {
  margin: 0;
  font-size: 0.875rem;
  color: var(--pdf-text-secondary);
  text-align: center;
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  text-align: center;
}

.empty-icon {
  width: 64px;
  height: 64px;
  color: var(--pdf-text-muted);
  margin-bottom: 1rem;
}

.empty-state h3 {
  margin: 0 0 0.5rem 0;
  color: var(--pdf-text-secondary);
  font-weight: 500;
}

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

/* ============================================
   Page Grid
   ============================================ */

.page-grid {
  flex: 1;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  align-content: start;
  overflow-y: auto;
}

.page-card {
  background: var(--pdf-bg-tertiary);
  border: 2px solid var(--pdf-border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 200px;
}

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

.page-card.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.page-card.manual-mode {
  cursor: grab;
}

.page-thumbnail {
  width: 100%;
  height: auto;
  min-height: 200px;
  display: block;
  background: white;
  object-fit: contain;
}

.page-info {
  padding: 0.75rem;
  background: var(--pdf-bg-secondary);
}

.page-number {
  font-size: 0.875rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
}

.page-date {
  font-size: 0.75rem;
  color: var(--pdf-date-text);
  margin: 0 0 0.25rem 0;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.page-date::before {
  content: '📅';
  font-size: 0.875rem;
}

.page-source {
  font-size: 0.75rem;
  color: var(--pdf-text-muted);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-no-date {
  font-size: 0.75rem;
  color: var(--pdf-text-muted);
  font-style: italic;
  margin: 0;
}

/* ============================================
   Collation Stats
   ============================================ */

.collation-stats {
  padding: 1rem 1.5rem;
  background: var(--pdf-bg-tertiary);
  border-top: 1px solid var(--pdf-border);
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--pdf-text-secondary);
}

.stat-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--pdf-text-primary);
}

/* ============================================
   Export Controls
   ============================================ */

.export-controls {
  padding: 1.5rem;
  background: var(--pdf-bg-tertiary);
  border-top: 1px solid var(--pdf-border);
  display: flex;
  justify-content: center;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: inherit;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--pdf-primary-hover);
  box-shadow: var(--shadow-sm);
}

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

.btn-success:hover:not(:disabled) {
  background: var(--pdf-success-hover);
  box-shadow: var(--shadow-sm);
}

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

.btn-danger:hover:not(:disabled) {
  background: var(--pdf-danger-hover);
}

.btn-secondary {
  background: var(--pdf-bg-tertiary);
  color: var(--pdf-text-primary);
  border: 1px solid var(--pdf-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--pdf-bg-primary);
}

.btn-text {
  background: transparent;
  color: var(--pdf-primary);
  padding: 0.25rem 0.5rem;
}

.btn-text:hover:not(:disabled) {
  background: var(--pdf-bg-primary);
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

.btn-icon-only {
  padding: 0.5rem;
  aspect-ratio: 1;
}

/* ============================================
   Modal
   ============================================ */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  cursor: pointer;
}

.modal-content {
  position: relative;
  max-width: 900px;
  max-height: 90vh;
  margin: 5vh auto;
  background: var(--pdf-bg-secondary);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 32px;
  height: 32px;
  border: none;
  background: var(--pdf-bg-tertiary);
  color: var(--pdf-text-primary);
  font-size: 1.5rem;
  line-height: 1;
  border-radius: 4px;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--pdf-danger);
  color: white;
}

.modal-body {
  flex: 1;
  overflow: auto;
  padding: 2rem;
  display: flex;
  gap: 2rem;
}

#modal-canvas {
  max-width: 500px;
  height: auto;
  border: 1px solid var(--pdf-border);
  border-radius: 4px;
  background: white;
}

.modal-info {
  flex: 1;
}

.modal-info h3 {
  margin: 0 0 1rem 0;
  font-size: 1.25rem;
}

.modal-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.detail-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--pdf-text-secondary);
  letter-spacing: 0.5px;
}

.detail-value {
  font-size: 0.875rem;
  color: var(--pdf-text-primary);
}

.date-badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  background: var(--pdf-date-highlight);
  color: var(--pdf-date-text);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

.modal-nav {
  padding: 1rem 2rem;
  background: var(--pdf-bg-tertiary);
  border-top: 1px solid var(--pdf-border);
  display: flex;
  justify-content: space-between;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
  .app-container {
    grid-template-columns: 1fr;
    height: auto;
  }
  
  .source-panel {
    border-right: none;
    border-bottom: 1px solid var(--pdf-border);
    max-height: 400px;
  }
  
  .preview-panel {
    min-height: 600px;
  }
}

@media (max-width: 768px) {
  .app-header h1 {
    font-size: 1.5rem;
  }
  
  .page-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.75rem;
    padding: 1rem;
  }
  
  .collation-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .modal-body {
    flex-direction: column;
    padding: 1rem;
  }
  
  #modal-canvas {
    max-width: 100%;
  }
  
  .collation-stats {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
  display: none !important;
}

.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Sortable.js styling */
.sortable-ghost {
  opacity: 0.4;
}

.sortable-chosen {
  cursor: grabbing !important;
}