/*
 * Tree Builder - Editorial CodePen Style
 *
 * Four-column layout with full-width visualization below.
 * Follows the ce-website editorial design: beige, thin lines, monospace.
 */

/* =============================================================================
   CSS Variables - Editorial Palette
   ============================================================================= */

.tree-builder-page {
  --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-teal: #5A8A8A;
  --font-mono: 'Courier New', 'Courier', Monaco, monospace;
  --font-size-tiny: 0.75rem;
  --font-size-small: 0.875rem;
  --font-size-body: 1rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --transition-fast: 150ms ease-in-out;
}

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

.tree-builder-page {
  position: relative;
  min-height: 100vh;
  background-color: var(--color-beige-light);
  font-family: var(--font-mono);
}

/* =============================================================================
   CODEPEN-STYLE LAYOUT - NEW: Code panel on right, viz large
   ============================================================================= */

/* Main container below nav */
.tree-builder-layout {
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  display: grid;
  grid-template-columns: 1fr 320px;  /* Left content + fixed-width code panel */
  grid-template-rows: 1fr;
}

/* Left area: editors + visualization */
.tree-builder-left {
  display: flex;
  flex-direction: column;
  border-right: 2px solid var(--color-line);
  overflow: hidden;
}

/* Editors row: Tree and Data side by side */
.tree-builder-editors {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  height: auto;
  max-height: 220px;
  min-height: 180px;
  border-bottom: 2px solid var(--color-line);
}

/* Top row: columns layout (deprecated but kept for compatibility) */
.tree-builder-columns {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.4fr;
  height: 35%;
  min-height: 280px;
  max-height: 320px;
  border-bottom: 2px solid var(--color-line);
}

/* 3-column layout (deprecated) */
.tree-builder-columns.three-col {
  grid-template-columns: 1.5fr 0.8fr 1.2fr;
}

/* Each column panel */
.tb-column {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--color-line);
  background-color: var(--color-beige-card);
  overflow: hidden;
}

.tb-column:last-child {
  border-right: none;
}

/* Column header */
.tb-column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-beige-base);
  border-bottom: 1px solid var(--color-line);
  min-height: 36px;
}

.tb-column-title {
  font-size: var(--font-size-small);
  font-weight: bold;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dark);
  margin: 0;
}

/* Selector rows for Tree/Data selection */
.selector-row {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.selector-label {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
  font-weight: bold;
}

/* Stack selectors vertically in header */
.tb-column-header {
  flex-wrap: wrap;
  gap: 4px;
}

/* Column content area */
.tb-column-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--color-line) transparent;
}

.tb-column-content::-webkit-scrollbar {
  width: 6px;
}

.tb-column-content::-webkit-scrollbar-track {
  background: transparent;
}

.tb-column-content::-webkit-scrollbar-thumb {
  background: var(--color-line);
  border-radius: 3px;
}

/* =============================================================================
   VISUALIZATION PANEL (Bottom - takes ~2/3 of vertical space)
   ============================================================================= */

.tree-builder-viz {
  flex: 1;
  min-height: 400px;
  background-color: var(--color-beige-light);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.viz-container {
  background-color: white;
  border: 1px solid var(--color-line);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  /* Scale the visualization to use more space */
  width: auto;
  height: auto;
  max-width: 90%;
  max-height: 90%;
}

/* Make the SVG inside scale up nicely */
.viz-container svg {
  display: block;
  width: 100%;
  height: 100%;
  min-width: 400px;
  min-height: 400px;
}

/* =============================================================================
   TREE VIEW (Column 1)
   ============================================================================= */

.tree-view {
  font-size: var(--font-size-body);
}

.tree-node {
  margin-bottom: 2px;
}

.node-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 6px;
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border-left: 2px solid transparent;
}

.node-header:hover {
  background-color: var(--color-beige-light);
}

.node-header--selected {
  background-color: var(--color-beige-base);
  border-left-color: var(--color-red-accent);
}

.expand-toggle {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
  width: 12px;
  cursor: pointer;
}

.expand-placeholder {
  width: 12px;
  color: var(--color-line);
}

.element-badge {
  font-size: var(--font-size-tiny);
  font-weight: bold;
  padding: 1px 4px;
  border: 1px solid var(--color-line);
  background-color: white;
  color: var(--color-text-dark);
}

.element-badge--svg { border-color: var(--color-red-accent); color: var(--color-red-accent); }
.element-badge--group { border-color: var(--color-teal); color: var(--color-teal); }
.element-badge--circle { border-color: #1d4ed8; color: #1d4ed8; }
.element-badge--rect { border-color: #16a34a; color: #16a34a; }
.element-badge--line { border-color: #b45309; color: #b45309; }
.element-badge--text { border-color: var(--color-text-muted); color: var(--color-text-muted); }

.join-badge {
  font-size: var(--font-size-tiny);
  font-weight: bold;
  padding: 1px 4px;
  border: 1px solid var(--color-teal);
  background-color: var(--color-teal);
  color: white;
}

.node-name {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
  font-style: italic;
}

.attr-count {
  font-size: var(--font-size-tiny);
  color: var(--color-line);
  margin-left: auto;
}

.remove-btn {
  width: 14px;
  height: 14px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-line);
  font-size: var(--font-size-body);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.node-header:hover .remove-btn {
  opacity: 1;
}

.remove-btn:hover {
  color: var(--color-red-accent);
}

.node-children {
  margin-left: 12px;
  border-left: 1px dashed var(--color-line);
  padding-left: 4px;
}

/* Empty tree state */
.empty-tree {
  padding: var(--spacing-md);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
}

/* =============================================================================
   ATTRIBUTE EDITOR (Column 2)
   ============================================================================= */

.attr-editor-empty {
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  font-style: italic;
  padding: var(--spacing-md);
  text-align: center;
}

.attr-editor-header {
  font-size: var(--font-size-small);
  font-weight: bold;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--color-line);
}

.attr-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.attr-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 6px;
  background-color: white;
  border: 1px solid var(--color-line);
  font-size: var(--font-size-small);
}

.attr-name {
  font-weight: bold;
  color: var(--color-teal);
  min-width: 50px;
}

.attr-arrow {
  color: var(--color-line);
}

.attr-choice {
  flex: 1;
  padding: 2px 4px;
  font-size: var(--font-size-tiny);
  font-family: var(--font-mono);
  border: 1px solid var(--color-line);
  background-color: var(--color-beige-card);
}

.remove-attr-btn {
  width: 14px;
  height: 14px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--color-line);
  cursor: pointer;
}

.remove-attr-btn:hover {
  color: var(--color-red-accent);
}

.add-attr-row {
  margin-top: var(--spacing-sm);
}

.add-attr-select {
  width: 100%;
  padding: 4px 6px;
  font-size: var(--font-size-tiny);
  font-family: var(--font-mono);
  border: 1px dashed var(--color-line);
  background-color: white;
  cursor: pointer;
}

/* =============================================================================
   DATA EDITOR (Column 3)
   ============================================================================= */

.data-editor {
  font-size: var(--font-size-tiny);
}

.data-json {
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--color-text-dark);
  margin: 0;
  padding: var(--spacing-xs);
  background-color: white;
  border: 1px solid var(--color-line);
}

.data-textarea {
  width: 100%;
  height: 100%;
  min-height: 200px;
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  line-height: 1.5;
  padding: var(--spacing-xs);
  border: 1px solid var(--color-line);
  background-color: white;
  resize: none;
}

/* =============================================================================
   CODE PANEL (Full-height right panel)
   ============================================================================= */

/* Full-height code panel */
.code-panel {
  display: flex;
  flex-direction: column;
  background-color: var(--color-beige-card);
  overflow: hidden;
}

.code-panel .tb-column-header {
  flex-shrink: 0;
}

.code-panel .tb-column-content {
  flex: 1;
  overflow-y: auto;
}

.code-view {
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--color-text-dark);
  margin: 0;
  padding: 0;
}

.code-keyword {
  color: var(--color-red-accent);
}

.code-string {
  color: var(--color-teal);
}

.code-number {
  color: #b45309;
}

.code-comment {
  color: var(--color-text-muted);
  font-style: italic;
}

/* =============================================================================
   ELEMENT PALETTE (in tree column header)
   ============================================================================= */

.palette-buttons {
  display: flex;
  gap: 2px;
}

.palette-btn {
  padding: 2px 6px;
  font-size: var(--font-size-tiny);
  font-weight: bold;
  font-family: var(--font-mono);
  border: 1px solid var(--color-line);
  background-color: white;
  color: var(--color-text-dark);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.palette-btn:hover {
  background-color: var(--color-beige-base);
  border-color: var(--color-text-dark);
}

.palette-btn--Container { border-color: var(--color-red-accent); color: var(--color-red-accent); }
.palette-btn--Shape { border-color: #1d4ed8; color: #1d4ed8; }
.palette-btn--Text { border-color: var(--color-text-muted); }

/* =============================================================================
   PRESET BUTTONS
   ============================================================================= */

.preset-buttons {
  display: flex;
  gap: 4px;
}

.preset-btn {
  padding: 2px 8px;
  font-size: var(--font-size-tiny);
  font-family: var(--font-mono);
  font-weight: bold;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--color-line);
  background-color: transparent;
  color: var(--color-text-dark);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-btn:hover {
  background-color: var(--color-beige-light);
  border-color: var(--color-text-dark);
}

.preset-btn--active {
  background-color: var(--color-red-accent);
  border-color: var(--color-red-accent);
  color: white;
}

/* =============================================================================
   ERROR DISPLAY
   ============================================================================= */

.preview-error {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-red-accent);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-small);
  border: 1px solid var(--color-red-accent);
}

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

@media (max-width: 1200px) {
  .tree-builder-columns {
    grid-template-columns: 1fr 1fr;
    height: 60%;
  }

  .tb-column:nth-child(3),
  .tb-column:nth-child(4) {
    border-top: 1px solid var(--color-line);
  }
}

@media (max-width: 768px) {
  .tree-builder-columns {
    grid-template-columns: 1fr;
    height: 70%;
  }

  .tb-column {
    border-right: none;
    border-bottom: 1px solid var(--color-line);
    max-height: 200px;
  }
}

/* =============================================================================
   INLINE ATTRIBUTES (within tree nodes)
   ============================================================================= */

.inline-attrs {
  margin-left: 16px;
  margin-top: 2px;
  padding: 4px 6px;
  background-color: white;
  border: 1px solid var(--color-line);
  border-left: 2px solid var(--color-teal);
}

.inline-attrs-list {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.inline-attr {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-tiny);
  padding: 2px 0;
}

.inline-attr-name {
  font-weight: bold;
  color: var(--color-teal);
  min-width: 40px;
}

.inline-attr-arrow {
  color: var(--color-line);
  font-size: 10px;
}

.inline-attr-remove {
  margin-left: auto;
  padding: 0 2px;
  border: none;
  background: transparent;
  color: var(--color-line);
  cursor: pointer;
  font-size: 10px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.inline-attr:hover .inline-attr-remove {
  opacity: 1;
}

.inline-attr-remove:hover {
  color: var(--color-red-accent);
}

/* Choice buttons for attribute values */
.choice-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.choice-btn {
  padding: 1px 4px;
  font-size: 9px;
  font-family: var(--font-mono);
  border: 1px solid var(--color-line);
  background-color: var(--color-beige-card);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.choice-btn:hover {
  background-color: var(--color-beige-base);
  border-color: var(--color-text-dark);
}

.choice-btn--active {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: white;
}

/* Add attribute row */
.inline-add-attr {
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px dashed var(--color-line);
}

.add-attr-btn {
  padding: 2px 6px;
  font-size: var(--font-size-tiny);
  font-family: var(--font-mono);
  border: 1px dashed var(--color-line);
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  width: 100%;
  text-align: left;
}

.add-attr-btn:hover {
  background-color: var(--color-beige-light);
  border-style: solid;
}

/* =============================================================================
   4-QUADRANT LAYOUT - Multiple Interpreters Demo
   ============================================================================= */

.quadrant-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  bottom: 0;
  gap: 2px;
  background-color: var(--color-line);
}

.quadrant {
  display: flex;
  flex-direction: column;
  background-color: var(--color-beige-card);
  overflow: hidden;
}

.quadrant-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-beige-base);
  border-bottom: 1px solid var(--color-line);
  min-height: 36px;
}

.quadrant-header h3 {
  font-size: var(--font-size-small);
  font-weight: bold;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dark);
  margin: 0;
}

.interpreter-tag {
  font-size: var(--font-size-tiny);
  font-family: var(--font-mono);
  padding: 2px 6px;
  border: 1px solid var(--color-line);
  background-color: white;
  color: var(--color-text-muted);
}

.quadrant-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--color-line) transparent;
}

.quadrant-content::-webkit-scrollbar {
  width: 6px;
}

.quadrant-content::-webkit-scrollbar-track {
  background: transparent;
}

.quadrant-content::-webkit-scrollbar-thumb {
  background: var(--color-line);
  border-radius: 3px;
}

/* Q1: TreeBuilder - with tabs */
.q1-treebuilder {
  grid-column: 1;
  grid-row: 1;
}

.q1-treebuilder .tab-buttons {
  display: flex;
  gap: 4px;
}

.q1-treebuilder .tab-btn {
  padding: 4px 12px;
  font-size: var(--font-size-tiny);
  font-family: var(--font-mono);
  font-weight: bold;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border: 1px solid var(--color-line);
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.q1-treebuilder .tab-btn:hover {
  background-color: var(--color-beige-light);
  border-color: var(--color-text-dark);
}

.q1-treebuilder .tab-btn--active {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: white;
}

/* Q2: MetaAST */
.q2-metaast {
  grid-column: 2;
  grid-row: 1;
}

.q2-metaast .ast-viz-container {
  background-color: white;
  border: 1px solid var(--color-line);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
}

.q2-metaast .ast-viz-container svg {
  display: block;
  max-width: 100%;
}

.q2-metaast .interpreter-tag {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

/* Q3: SemiQuine/TreeToCode */
.q3-semiquine {
  grid-column: 1;
  grid-row: 2;
}

.q3-semiquine .code-output {
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--color-text-dark);
  margin: 0;
  padding: var(--spacing-xs);
  background-color: #1e1e1e;
  border: 1px solid var(--color-line);
  min-height: 100px;
  color: #d4d4d4;
}

.q3-semiquine .interpreter-tag {
  border-color: var(--color-red-accent);
  color: var(--color-red-accent);
}

/* Q4: D3 Preview */
.q4-d3preview {
  grid-column: 2;
  grid-row: 2;
}

.q4-d3preview .preview-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: white;
  border: 1px solid var(--color-line);
  min-height: 200px;
}

.q4-d3preview .preview-container svg {
  display: block;
  max-width: 100%;
  max-height: 100%;
}

.q4-d3preview .interpreter-tag {
  border-color: #1d4ed8;
  color: #1d4ed8;
}

/* =============================================================================
   SANKEY WATERMARK
   ============================================================================= */

.sankey-watermark {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.sankey-watermark svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* Make viz area position:relative for watermark positioning */
.tree-builder-viz {
  position: relative;
}

/* Ensure viz container is above the watermark */
.viz-container {
  position: relative;
  z-index: 1;
}

/* =============================================================================
   TREEBUILDER3 - DSL Grammar Tree Builder
   ============================================================================= */

.tree-builder3-container {
  font-family: var(--font-mono);
  padding: var(--spacing-md);
  outline: none;
}

.tree-builder3-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.tree-builder3-header h2 {
  margin: 0;
  font-size: 1.25rem;
}

.import-example-btn {
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: var(--font-size-small);
  border: 1px solid var(--color-line);
  background-color: var(--color-beige-card);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.import-example-btn:hover {
  background-color: var(--color-beige-base);
  border-color: var(--color-text-dark);
}

.tree-builder3-container .instructions {
  font-size: var(--font-size-small);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

/* Editors row: tree viz and form side by side */
.tree-builder3-editors-row {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.tree-builder3-svg-container {
  flex: 1;
  min-width: 400px;
  background-color: white;
  border: 1px solid var(--color-line);
}

.tree-builder3-form-panel {
  flex: 1;
  min-width: 300px;
  max-width: 500px;
  background-color: var(--color-beige-card);
  border: 1px solid var(--color-line);
  padding: var(--spacing-sm);
  overflow: auto;
  max-height: 500px;
}

.tree-builder3-form-panel h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-small);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-dark);
  border-bottom: 1px solid var(--color-line);
  padding-bottom: var(--spacing-xs);
}

/* Code panel below */
.tree-builder3-code-panel {
  background-color: var(--color-beige-card);
  border: 1px solid var(--color-line);
  padding: var(--spacing-sm);
}

.tree-builder3-code-panel h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-small);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-dark);
}

.tree-builder3-code-panel .code-output {
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
  padding: var(--spacing-sm);
  background-color: #1e1e1e;
  color: #d4d4d4;
  border: 1px solid var(--color-line);
  max-height: 300px;
  overflow: auto;
}

/* AST Form styles */
.ast-form {
  font-family: var(--font-mono);
}

.ast-form-code {
  font-size: var(--font-size-tiny);
  line-height: 1.6;
  margin: 0;
  white-space: pre-wrap;
}

.ast-form-name-input,
.ast-form-key-input,
.ast-form-value-input {
  font-family: var(--font-mono);
  font-size: var(--font-size-tiny);
  padding: 2px 4px;
  border: 1px solid var(--color-teal);
  background-color: white;
  color: var(--color-teal);
}

.ast-form-name-input:focus,
.ast-form-key-input:focus,
.ast-form-value-input:focus {
  outline: none;
  border-color: var(--color-red-accent);
  box-shadow: 0 0 0 2px rgba(230, 57, 70, 0.2);
}

/* =============================================================================
   AST PRESET CARDS (TOP ROW)
   ============================================================================= */

.tree-builder3-ast-cards {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.ast-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  min-width: 80px;
  background-color: var(--color-beige-card);
  border: 2px solid var(--color-line);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ast-card:hover {
  background-color: var(--color-beige-base);
  border-color: var(--color-text-dark);
}

.ast-card-selected {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: white;
}

.ast-card-selected:hover {
  background-color: #4a7a7a;
  border-color: #4a7a7a;
}

.ast-card-name {
  font-size: var(--font-size-small);
  font-weight: bold;
  letter-spacing: 0.05em;
}

.ast-card-description {
  font-size: var(--font-size-tiny);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.ast-card-selected .ast-card-description {
  color: rgba(255, 255, 255, 0.8);
}

/* =============================================================================
   RENDERED OUTPUT PANEL
   ============================================================================= */

.tree-builder3-output-panel {
  flex: 0 0 300px;
  min-width: 250px;
  max-width: 400px;
  background-color: var(--color-beige-card);
  border: 1px solid var(--color-line);
  padding: var(--spacing-sm);
  overflow: auto;
  max-height: 600px;
}

.tree-builder3-output-panel h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: var(--font-size-small);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-dark);
  border-bottom: 1px solid var(--color-line);
  padding-bottom: var(--spacing-xs);
}

.tree-builder3-output-content {
  font-size: var(--font-size-small);
}

.output-placeholder {
  color: var(--color-text-muted);
  padding: var(--spacing-md);
  text-align: center;
}

.output-placeholder p {
  margin: var(--spacing-xs) 0;
}

.output-ready {
  color: var(--color-teal);
  padding: var(--spacing-xs);
}

.output-ready p {
  margin: 0 0 var(--spacing-sm) 0;
  font-weight: bold;
}

.output-svg-container {
  background-color: white;
  border: 1px solid var(--color-line);
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* =============================================================================
   TryMe Mode - Instructions Popup
   ============================================================================= */

.tryme-popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.tryme-popup {
  background-color: var(--color-beige-card, #F5F2E8);
  border: 2px solid var(--color-teal, #5A8A8A);
  border-radius: 8px;
  padding: 2rem;
  max-width: 500px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.tryme-popup h2 {
  margin: 0 0 1rem 0;
  color: var(--color-teal, #5A8A8A);
  font-size: 1.5rem;
}

.tryme-popup h3 {
  margin: 1.5rem 0 0.75rem 0;
  color: var(--color-text-dark, #333);
  font-size: 1rem;
  border-bottom: 1px solid var(--color-line, #999);
  padding-bottom: 0.25rem;
}

.tryme-popup p {
  margin: 0 0 1rem 0;
  line-height: 1.5;
  color: var(--color-text-dark, #333);
}

.tryme-popup ul,
.tryme-popup ol {
  margin: 0 0 1rem 0;
  padding-left: 1.5rem;
}

.tryme-popup li {
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.tryme-popup strong {
  color: var(--color-teal, #5A8A8A);
  background-color: rgba(90, 138, 138, 0.1);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  font-family: var(--font-mono, monospace);
}

.tryme-content {
  font-size: 0.95rem;
}

.tryme-dismiss {
  text-align: center;
  font-style: italic;
  color: var(--color-text-muted, #666);
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--color-line, #999);
}

/* =============================================================================
   TryMe Mode - English Description Output
   ============================================================================= */

.english-output {
  background-color: var(--color-beige-card, #F5F2E8);
}

.english-description {
  font-family: var(--font-mono, monospace);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-text-dark, #333);
  margin: 0;
  padding: 1rem;
  background-color: white;
  border: 1px solid var(--color-line, #999);
  border-radius: 4px;
  white-space: pre-wrap;
  min-height: 200px;
}