/*
 * Simple Tree Builder - Emmet-style AST Builder
 *
 * Two-panel layout: Left (input + examples), Right (types + preview)
 * Follows the editorial design: beige, thin lines, monospace.
 */

/* =============================================================================
   CSS Variables
   ============================================================================= */

.simple-tree-builder {
  --color-beige-base: #D4C9A8;
  --color-beige-light: #E8E0CC;
  --color-beige-dark: #C9B8A0;
  --color-beige-card: #F5F2E8;
  --color-line: #999999;
  --color-text-dark: #333333;
  --color-text-muted: #666666;
  --color-red-accent: #E63946;
  --color-green-accent: #2CA02C;
  --color-teal: #5A8A8A;
  --font-mono: 'Courier New', 'Courier', Monaco, monospace;
  --font-size-tiny: 0.75rem;
  --font-size-small: 0.875rem;
  --font-size-body: 1rem;
  --font-size-large: 1.125rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --transition-fast: 150ms ease-in-out;
  --border-thin: 1px solid var(--color-line);
  --border-thick: 2px solid var(--color-line);
}

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

.simple-tree-builder {
  min-height: 100vh;
  background-color: var(--color-beige-light);
  font-family: var(--font-mono);
  color: var(--color-text-dark);
}

.builder-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  min-height: calc(100vh - 60px);
}

/* =============================================================================
   LEFT PANEL - Input & Examples
   ============================================================================= */

.builder-left-panel {
  border-right: var(--border-thick);
  background-color: var(--color-beige-card);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  overflow-y: auto;
}

/* Input Section */
.input-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.section-title {
  font-size: var(--font-size-large);
  font-weight: 600;
  margin: 0;
  padding-bottom: var(--spacing-sm);
  border-bottom: var(--border-thin);
  color: var(--color-text-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-subtitle {
  font-size: var(--font-size-body);
  font-weight: 600;
  margin: 0;
  padding-bottom: var(--spacing-xs);
  border-bottom: var(--border-thin);
  color: var(--color-text-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.emmet-input {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: var(--font-size-body);
  border: var(--border-thin);
  background-color: white;
  color: var(--color-text-dark);
  resize: vertical;
  min-height: 100px;
  transition: border-color var(--transition-fast);
}

.emmet-input:focus {
  outline: none;
  border-color: var(--color-teal);
}

.emmet-input::placeholder {
  color: var(--color-text-muted);
  font-style: italic;
}

.clear-button {
  align-self: flex-end;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-mono);
  font-size: var(--font-size-small);
  background-color: white;
  border: var(--border-thin);
  color: var(--color-text-dark);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.clear-button:hover:not(:disabled) {
  background-color: var(--color-beige-base);
  border-color: var(--color-text-dark);
}

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

/* Parse Status */
.parse-status {
  padding: var(--spacing-md);
  border: var(--border-thin);
  font-size: var(--font-size-small);
  line-height: 1.5;
}

.parse-status.info {
  background-color: var(--color-beige-light);
  border-color: var(--color-line);
  color: var(--color-text-muted);
}

.parse-status.success {
  background-color: #d4edda;
  border-color: var(--color-green-accent);
  color: #155724;
}

.parse-status.error {
  background-color: #f8d7da;
  border-color: var(--color-red-accent);
  color: #721c24;
}

.parse-status strong {
  font-weight: 700;
}

/* Examples Section */
.examples-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.example-card {
  padding: var(--spacing-md);
  border: var(--border-thin);
  background-color: white;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.example-card:hover {
  border-color: var(--color-teal);
  background-color: var(--color-beige-light);
  transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.example-card.selected {
  border-color: var(--color-teal);
  border-width: 2px;
  background-color: var(--color-beige-light);
}

.example-name {
  font-weight: 600;
  font-size: var(--font-size-body);
  color: var(--color-text-dark);
}

.example-description {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  line-height: 1.4;
}

.example-code {
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  background-color: var(--color-beige-light);
  padding: var(--spacing-sm);
  border: var(--border-thin);
  border-radius: 2px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

/* =============================================================================
   RIGHT PANEL - Types & Preview
   ============================================================================= */

.builder-right-panel {
  background-color: var(--color-beige-card);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  overflow-y: auto;
}

/* Type Selector */
.type-selector-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.type-card {
  padding: var(--spacing-md);
  border: var(--border-thin);
  background-color: white;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.type-card:hover {
  border-color: var(--color-teal);
  background-color: var(--color-beige-light);
  transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.type-card.selected {
  border-color: var(--color-teal);
  border-width: 2px;
  background-color: var(--color-beige-light);
}

.type-name {
  font-weight: 700;
  font-size: var(--font-size-body);
  color: var(--color-text-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-bottom: var(--spacing-xs);
  border-bottom: var(--border-thin);
}

.type-fields {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.type-field {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  line-height: 1.4;
}

.field-name {
  color: var(--color-teal);
  font-weight: 600;
}

.field-type {
  color: var(--color-text-muted);
}

/* Preview Section */
.preview-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  flex: 1;
}

.tree-visualization {
  flex: 1;
  padding: var(--spacing-md);
  border: var(--border-thin);
  background-color: white;
  overflow: auto;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tree-visualization svg {
  max-width: 100%;
  max-height: 100%;
}

/* Empty state for visualization */
.tree-visualization:empty::after {
  content: "Parse an expression to see the visualization";
  color: var(--color-text-muted);
  font-style: italic;
  font-size: var(--font-size-small);
}

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

@media (max-width: 1200px) {
  .builder-container {
    grid-template-columns: 1fr;
  }

  .builder-left-panel {
    border-right: none;
    border-bottom: var(--border-thick);
  }

  .examples-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }

  .types-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
}

@media (max-width: 768px) {
  .builder-left-panel,
  .builder-right-panel {
    padding: var(--spacing-md);
  }

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

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

  .section-title {
    font-size: var(--font-size-body);
  }
}

/* =============================================================================
   ACCESSIBILITY
   ============================================================================= */

.emmet-input:focus,
.clear-button:focus,
.example-card:focus,
.type-card:focus {
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
}

/* Ensure sufficient contrast */
@media (prefers-contrast: high) {
  .simple-tree-builder {
    --color-text-dark: #000000;
    --color-line: #666666;
  }

  .example-card,
  .type-card {
    border-width: 2px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .simple-tree-builder * {
    transition: none !important;
  }

  .example-card:hover,
  .type-card:hover {
    transform: none;
  }
}