/* VB6Parse Playground - Tree Visualization Styles */

/* ============================================
   D3.js Tree Specific Styles
   ============================================ */

/* SVG Container */
#tree-viz-svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* Tree Group (zoomable/pannable container) */
.tree-group {
    cursor: grab;
}

.tree-group:active {
    cursor: grabbing;
}

/* ============================================
   Tree Nodes
   ============================================ */

/* Base node styling */
.tree-node {
    cursor: pointer;
    transition: all 0.3s ease;
}

.tree-node circle {
    fill: var(--node-default);
    stroke: var(--text-color);
    stroke-width: 2px;
    transition: all 0.3s ease;
}

/* Node type colors */
.tree-node.node-statement circle {
    fill: var(--node-statement);
}

.tree-node.node-expression circle {
    fill: var(--node-expression);
}

.tree-node.node-literal circle {
    fill: var(--node-literal);
}

.tree-node.node-keyword circle {
    fill: var(--node-keyword);
}

/* Hover state */
.tree-node:hover circle {
    stroke-width: 3px;
    filter: brightness(1.2);
    r: 8; /* Slightly larger on hover */
}

/* Selected/active node */
.tree-node.selected circle {
    stroke-width: 4px;
    stroke: var(--accent-color);
    filter: drop-shadow(0 0 4px var(--accent-color));
}

/* Node text labels */
.tree-node text {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 12px;
    fill: var(--text-color);
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: central;
}

/* Node text for horizontal layout */
.tree-node.horizontal text {
    text-anchor: start;
}

/* Collapsed node indicator */
.tree-node.has-children circle {
    stroke-dasharray: 3, 3;
}

.tree-node.collapsed circle {
    fill-opacity: 0.7;
}

/* ============================================
   Tree Links (Edges)
   ============================================ */

.tree-link {
    fill: none;
    stroke: var(--panel-border);
    stroke-width: 2px;
    stroke-opacity: 0.6;
    transition: all 0.3s ease;
}

/* Darker stroke in dark mode */
[data-theme="dark"] .tree-link {
    stroke: var(--text-color);
    stroke-opacity: 0.4;
}

/* Highlighted link when node is hovered */
.tree-link.highlighted {
    stroke: var(--primary-color);
    stroke-width: 3px;
    stroke-opacity: 1;
}

/* Curved path links */
.tree-link.curved {
    /* Path curvature is handled by D3 */
}

/* Straight links */
.tree-link.straight {
    /* For orthogonal tree layouts */
}

/* ============================================
   Zoom Controls
   ============================================ */

.zoom-controls {
    position: absolute;
    top: 70px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 10;
}

.zoom-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 4px;
    background-color: var(--background-color);
    border: 1px solid var(--panel-border);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

.zoom-btn:active {
    transform: scale(0.95);
}

/* ============================================
   Tree Layout Toggle
   ============================================ */

/* Visual indicator for layout orientation */
.tree-viz-container.horizontal {
    /* Additional styling when horizontal layout is active */
}

.tree-viz-container.vertical {
    /* Additional styling when vertical layout is active */
}

/* ============================================
   Minimap (Optional Enhancement)
   ============================================ */

.tree-minimap {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 150px;
    height: 100px;
    background-color: var(--background-color);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    opacity: 0.8;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

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

.minimap-viewport {
    fill: var(--primary-color);
    fill-opacity: 0.2;
    stroke: var(--primary-color);
    stroke-width: 1px;
    cursor: move;
}

/* ============================================
   Tooltips for Nodes
   ============================================ */

.tree-tooltip {
    position: absolute;
    background-color: var(--background-color);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 0.85rem;
    pointer-events: none;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    max-width: 250px;
    word-wrap: break-word;
}

.tree-tooltip.hidden {
    display: none;
}

.tree-tooltip .tooltip-title {
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--primary-color);
}

.tree-tooltip .tooltip-content {
    font-size: 0.8rem;
    color: var(--text-color);
}

.tree-tooltip .tooltip-range {
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--placeholder-color);
    margin-top: 4px;
}

/* ============================================
   Search/Highlight in Tree
   ============================================ */

.tree-node.search-match circle {
    fill: var(--accent-color);
    stroke: var(--accent-color);
    stroke-width: 3px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

/* ============================================
   Context Menu (Right-click on nodes)
   ============================================ */

.tree-context-menu {
    position: absolute;
    background-color: var(--background-color);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    min-width: 150px;
}

.tree-context-menu.hidden {
    display: none;
}

.context-menu-item {
    padding: 8px 12px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 0.9rem;
}

.context-menu-item:hover {
    background-color: var(--primary-color);
    color: white;
}

.context-menu-item:first-child {
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
}

.context-menu-item:last-child {
    border-bottom-left-radius: 4px;
    border-bottom-right-radius: 4px;
}

.context-menu-divider {
    height: 1px;
    background-color: var(--panel-border);
    margin: 4px 0;
}

/* ============================================
   Loading State
   ============================================ */

.tree-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.tree-loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--panel-border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

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

.tree-empty {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--placeholder-color);
}

.tree-empty-icon {
    font-size: 4rem;
    margin-bottom: 10px;
}

.tree-empty-text {
    font-size: 1.1rem;
}

/* ============================================
   Performance Optimizations
   ============================================ */

/* Disable animations for large trees (>500 nodes) */
.tree-viz-container.large-tree .tree-node,
.tree-viz-container.large-tree .tree-link {
    transition: none;
}

/* Simplify rendering for very large trees (>1000 nodes) */
.tree-viz-container.very-large-tree .tree-node text {
    display: none; /* Hide labels to improve performance */
}

.tree-viz-container.very-large-tree .tree-node circle {
    r: 3; /* Smaller nodes */
}

.tree-viz-container.very-large-tree .tree-link {
    stroke-width: 1px;
}

/* ============================================
   Export/Screenshot Mode
   ============================================ */

.tree-viz-container.export-mode {
    background-color: white;
}

.tree-viz-container.export-mode .tree-node text {
    fill: #000000;
}

.tree-viz-container.export-mode .tree-link {
    stroke: #cccccc;
}

/* ============================================
   Responsive Adjustments
   ============================================ */

@media (max-width: 768px) {
    .tree-node text {
        font-size: 10px;
    }
    
    .tree-minimap {
        width: 100px;
        height: 70px;
    }
    
    .zoom-controls {
        top: 10px;
        left: 10px;
    }
    
    .zoom-btn {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
}

/* ============================================
   Accessibility
   ============================================ */

/* Focus indicator for keyboard navigation */
.tree-node:focus {
    outline: none;
}

.tree-node:focus circle {
    stroke: var(--accent-color);
    stroke-width: 4px;
    filter: drop-shadow(0 0 4px var(--accent-color));
}

/* Screen reader only text */
.tree-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .tree-node circle {
        stroke-width: 3px;
    }
    
    .tree-link {
        stroke-width: 3px;
        stroke-opacity: 1;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .tree-node,
    .tree-link,
    .zoom-btn {
        transition: none;
    }
    
    .tree-node.search-match circle {
        animation: none;
    }
}