/* =============================================================================
   AI ENHANCEMENT MODAL (Phase 7.1)
   ============================================================================= */

/* Skip Link */
.ai-comparison-column .skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: #005c84;
  color: #fff;
  text-decoration: none;
  font-size: 0.875rem;
  border-radius: 0 0 4px 0;
}

.ai-comparison-column .skip-link:focus {
  left: 0;
  outline: 2px solid #005c84;
  outline-offset: 2px;
}

.column-content.mmd-preview {
  position: relative;
}

/* =============================================================================
   COLOURS
   ============================================================================= */

/* Enhance Button (Toolbar) */

/* Description */
/* Model Selection */
.ai-model-selection {
  border-color: currentcolor;
}
.model-option {
  border-color: transparent;
}
.model-option:hover {
  background-color: #f0f2e8;
}
.model-option:has(input:checked) {
  border-color: #005c84;
  background-color: rgba(0, 92, 132, 0.09);
}
.model-option-description {
  color: #495961;
}
.model-option-cost {
  color: #8d3970;
}
/* Document Info */
.ai-document-info {
  background-color: #e1e8ec;
  border-color: currentcolor;
}
/* Cost Estimate */
.ai-cost-estimate {
  background-color: rgba(141, 57, 112, 0.1);
  border-color: #8d3970;
}
.ai-cost-estimate-note {
  color: #495961;
}
/* Processing State */
.processing-spinner {
  border-color: #e1e8ec;
  border-top-color: #005c84;
}
.processing-progress {
  background-color: #e1e8ec;
  border: 1px solid currentcolor;
}
.progress-fill {
  background-color: #005c84;
}
.processing-text {
  color: #495961;
}
/* Results - Comparison Panel */
.comparison-column h4 {
  border-bottom-color: #758d9a;
}
.comparison-content {
  background-color: #e1e8ec;
  border-color: currentcolor;
}
/* Results - Preview */
.ai-preview-container {
  background-color: rgba(225, 232, 236, 0.2);
  border-color: #ddd;
}
/* Error Display */
.ai-error-display .error-icon {
  color: #d5007f;
}
.ai-error-display h3 {
  color: #d5007f;
}
/* The container needs overflow-x for scrolling to work */
#ai-col-preview {
  overflow-x: auto;
}

#ai-col-preview table {
  margin: 1rem auto; /* auto centres horizontally (replaces deprecated align="center") */
  border-collapse: collapse;
  width: auto;
}

#ai-col-preview th,
#ai-col-preview td {
  border: 1px solid #495961; /* WCAG AA contrast against white/light grey */
  padding: 0.5rem 0.75rem;
  text-align: center; /* truth tables typically look better centred */
  vertical-align: middle; /* helps with MathJax SVG alignment */
}

#ai-col-preview th {
  background-color: #9fb1bd;
  font-weight: bold;
}

/* Optional: zebra striping for longer tables */
#ai-col-preview tbody tr:nth-child(even) {
  background-color: #e1e8ec;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .processing-spinner {
    border-top-color: #ddd;
  }
}

/* 4 column comparison grid */
.ai-column-toggles {
  background: #e1e8ec;
  border-color: #768690;
}

.ai-column-toggles input[type="checkbox"]:focus-visible {
  outline-color: #005c84;
}

.ai-comparison-column {
  border-color: #768690;
}

.ai-comparison-column > h4 {
  background: #e1e8ec;
  border-bottom-color: #768690;
}

.column-content.mmd-code {
  background: #f8f8f8;
}

.column-content.mmd-preview {
  background: #fff;
}

.column-content.pdf-viewer {
  background: #fff;
}

.column-content.pdf-viewer .ai-pdf-loading-spinner {
  border-color: #e1e8ec;
  border-top-color: #005c84;
}

.column-content.pdf-viewer .ai-pdf-error {
  color: #d5007f;
}

.ai-pdf-page canvas {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

/* =============================================================================
   STRUCTURE
   ============================================================================= */

/* Enhance Button (Toolbar) */

.ai-enhance-btn [data-icon] {
  width: 21px;
  height: 21px;
}

/* Description */
.ai-enhance-description {
  margin-bottom: 1.5rem;
}

/* Model Selection */
.ai-model-selection {
  border-width: 1px;
  border-style: solid;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.ai-model-selection legend {
  font-weight: 600;
  padding: 0 0.5rem;
}

.model-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.model-option {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem;
  border-width: 2px;
  border-style: solid;
  border-radius: 6px;
  cursor: pointer;
  transition:
    border-color 0.15s ease,
    background-color 0.15s ease;
}

.model-option input[type="radio"] {
  margin-top: 0.25rem;
  flex-shrink: 0;
}

.model-option-content {
  flex: 1;
}

.model-option-name {
  font-weight: 600;
  display: block;
}

.model-option-description {
  font-size: 0.875rem;
  display: block;
  margin-top: 0.25rem;
}

.model-option-cost {
  font-size: 0.8rem;
  display: block;
  margin-top: 0.25rem;
}

/* Document Info */
.ai-document-info {
  border-width: 1px;
  border-style: solid;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.ai-document-info dt {
  font-weight: 600;
  display: inline;
}

.ai-document-info dt::after {
  content: ": ";
}

.ai-document-info dd {
  display: inline;
  margin: 0;
}

.ai-document-info dd::after {
  content: "";
  display: block;
  margin-bottom: 0.5rem;
}

.ai-document-info dd:last-child::after {
  margin-bottom: 0;
}

/* Cost Estimate */
.ai-cost-estimate {
  border-width: 1px;
  border-style: solid;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.ai-cost-estimate-label {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.ai-cost-estimate-value {
  font-size: 1.25rem;
  font-weight: 700;
}

.ai-cost-estimate-note {
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

/* Processing State */
.ai-processing-display {
  text-align: center;
  padding: 2rem;
}

.processing-spinner {
  width: 48px;
  height: 48px;
  border-width: 4px;
  border-style: solid;
  border-radius: 50%;
  animation: ai-enhance-spin 0.8s linear infinite;
  margin: 0 auto 1.5rem;
}

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

.processing-stage {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.processing-progress {
  width: 100%;
  max-width: 300px;
  height: 8px;
  border-radius: 4px;
  margin: 0 auto 0.5rem;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.3s ease;
}

.processing-text {
  font-size: 0.875rem;
}

/* Column Toggles Fieldset */
.ai-column-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.5rem 0.75rem;
  border-width: 1px;
  border-style: solid;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.ai-column-toggles legend {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ai-column-toggles label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  cursor: pointer;
}

.ai-column-toggles input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}

.ai-column-toggles input[type="checkbox"]:focus-visible {
  outline-width: 2px;
  outline-style: solid;
  outline-offset: 2px;
}

/* Results Display Container */
.ai-results-display {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  flex: 1;
}

/* 4-Column Comparison Grid */
.ai-comparison-grid {
  display: grid;
  gap: 0.75rem;
  flex: 1;
  min-height: 0;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: stretch;
}

/* Individual Column */
.ai-comparison-column {
  display: flex;
  flex-direction: column;
  min-height: 200px;
  height: 100%;
  border-width: 1px;
  border-style: solid;
  border-radius: 4px;
  overflow: hidden;
}

.ai-comparison-column[hidden] {
  display: none;
}

.ai-comparison-column > h4 {
  margin: 0;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-bottom-width: 1px;
  border-bottom-style: solid;
  flex-shrink: 0;
}

.ai-comparison-column > .column-content {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0.75rem;
  min-height: 0;
}

/* MMD Code Content */
.column-content.mmd-code {
  font-family:
    ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace;
  font-size: 0.8125rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

/* MMD Preview Content */
.column-content.mmd-preview {
  display: flex;
  flex-direction: column;
}

.column-content.mmd-preview > * {
  flex-shrink: 0;
}

/* PDF Viewer Content */
.column-content.pdf-viewer {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.column-content.pdf-viewer .ai-pdf-loading {
  text-align: center;
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.column-content.pdf-viewer .ai-pdf-loading-spinner {
  width: 32px;
  height: 32px;
  border-width: 3px;
  border-style: solid;
  border-radius: 50%;
  animation: ai-enhance-spin 0.8s linear infinite;
  margin: 0 auto 0.75rem;
}

.column-content.pdf-viewer .ai-pdf-error {
  text-align: center;
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* PDF Controls */
.ai-pdf-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.375rem 0.5rem;
  border-top-width: 1px;
  border-top-style: solid;
  flex-shrink: 0;
}

.ai-pdf-navigation {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.ai-pdf-page-input {
  width: 3rem;
  padding: 0.25rem 0.375rem;
  font-size: 0.8125rem;
  text-align: center;
  border-width: 1px;
  border-style: solid;
  border-radius: 3px;
}

.ai-pdf-page-input:focus {
  outline-width: 2px;
  outline-style: solid;
  outline-offset: 1px;
}

.ai-pdf-page-total {
  font-size: 0.8125rem;
}

.ai-pdf-zoom {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.ai-pdf-zoom-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.25rem 0.375rem;
  font-size: 0.75rem;
  border-width: 1px;
  border-style: solid;
  border-radius: 3px;
  cursor: pointer;
}

.ai-pdf-zoom-btn:focus-visible {
  outline-width: 2px;
  outline-style: solid;
  outline-offset: 1px;
}

.ai-pdf-zoom-btn .icon {
  width: 16px;
  height: 16px;
}

.ai-pdf-zoom-level {
  font-size: 0.75rem;
  min-width: 2.5rem;
  text-align: center;
}

/* PDF Scroll Container */
.ai-pdf-scroll-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.5rem;
  min-height: 0;
}

/* PDF Page Container */
.ai-pdf-pages-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
}

.ai-pdf-page {
  width: 100%;
  display: flex;
  justify-content: center;
}

.ai-pdf-page canvas {
  max-width: 100%;
  height: auto;
}

/* Legacy Comparison Panel (fallback) */
.ai-comparison-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.comparison-column h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom-width: 1px;
  border-bottom-style: solid;
}

.comparison-content {
  border-width: 1px;
  border-style: solid;
  border-radius: 4px;
  padding: 1rem;
  max-height: 300px;
  overflow-y: auto;
  font-family: monospace;
  font-size: 0.85rem;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Legacy Preview Container */
.ai-preview-container {
  border-width: 1px;
  border-style: solid;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
  max-height: 200px;
  overflow-y: auto;
}

.ai-preview-container h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}
/* Error Display */
.ai-error-display {
  text-align: center;
  padding: 2rem;
}

.ai-error-display .error-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
}

.ai-error-display h3 {
  margin-bottom: 0.5rem;
}

/* Modal Actions */
.ai-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top-width: 1px;
  border-top-style: solid;
}

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

@media (max-width: 768px) {
  .ai-comparison-panel {
    grid-template-columns: 1fr;
  }

  .comparison-content {
    max-height: 200px;
  }

  .model-options {
    gap: 0.5rem;
  }

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

  .ai-modal-actions button {
    width: 100%;
  }

  /* 4-Column Grid Mobile */
  .ai-comparison-grid {
    grid-template-columns: 1fr;
  }

  .ai-column-toggles {
    gap: 0.5rem;
  }

  .ai-column-toggles label {
    flex: 1 1 45%;
    min-width: 120px;
  }

  .ai-comparison-column > .column-content {
    max-height: 300px;
  }
}

@media (max-width: 480px) {
  .ai-column-toggles label {
    flex: 1 1 100%;
  }
}

/* =============================================================================
   REDUCED MOTION
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
  .processing-spinner {
    animation: none;
    opacity: 0.5;
  }

  .progress-fill {
    transition: none;
  }
}

/* =============================================================================
   PRINT
   ============================================================================= */

@media print {
  .ai-enhance-btn,
  #ai-enhance-btn-desc {
    display: none !important;
  }
}