/* 
 * tree.css - Dual-Pane State-Space Tree & Grid Search Graph Visualizer Styles
 * Styled to match the design system of PCB Autorouter & Search Algorithm Visualizer
 */

.tree-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.78);
    backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease-out;
}

.tree-modal-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
}

.tree-modal-backdrop.hidden {
    opacity: 0;
    pointer-events: none;
}

.tree-modal-container {
    width: 95vw;
    height: 90vh;
    background: var(--bg-primary, #ffffff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: var(--radius-lg, 12px);
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 40px rgba(0, 0, 0, 0.65);
    overflow: hidden;
    animation: modalSlideUp 0.3s ease-out;
}

@keyframes modalSlideUp {
    from {
        transform: translateY(16px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.tree-modal-header {
    padding: 12px 20px;
    background: var(--card-bg, #ffffff);
    border-bottom: 1px solid var(--border-color, #e2e8f0);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-shrink: 0;
}

.tree-header-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}

.tree-modal-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary, #0f172a);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tree-modal-title [data-lucide] {
    color: var(--accent-primary, #2563eb);
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.tree-modal-stats {
    font-size: 0.8rem;
    color: var(--text-secondary, #64748b);
}

.tree-modal-stats strong {
    color: var(--accent-primary, #2563eb);
}

.tree-header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* View Mode Segmented Control */
.tree-view-switcher {
    display: inline-flex;
    align-items: center;
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-md, 8px);
    padding: 3px;
    gap: 2px;
}

.tree-view-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    font-size: 0.78rem;
    font-weight: 600;
    color: #475569;
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
}

.tree-view-btn svg,
.tree-view-btn [data-lucide] {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    stroke-width: 2.2;
}

.tree-view-btn:hover {
    color: #0f172a;
    background: rgba(255, 255, 255, 0.6);
}

.tree-view-btn.active {
    color: #2563eb;
    background: #ffffff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.tree-btn-export {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 13px;
    font-size: 0.78rem;
    font-weight: 600;
    color: #ffffff;
    background: #2563eb;
    border: 1px solid #1d4ed8;
    border-radius: var(--radius-md, 8px);
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.25);
    white-space: nowrap;
}

.tree-btn-export:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(37, 99, 235, 0.35);
}

.tree-btn-export:active {
    transform: translateY(0);
}

.tree-btn-export svg,
.tree-btn-export [data-lucide] {
    width: 14px;
    height: 14px;
    stroke: currentColor;
    stroke-width: 2.2;
}

.tree-btn-icon {
    width: 34px;
    height: 34px;
    padding: 0;
    flex-shrink: 0;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-md, 8px);
    color: #334155;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast, 0.15s ease);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.tree-btn-icon:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
    color: #ef4444;
    transform: translateY(-1px);
}

.tree-btn-icon:active {
    transform: translateY(0);
}

.tree-btn-icon svg,
.tree-btn-icon i,
.tree-btn-icon [data-lucide] {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    stroke-width: 2.2;
    display: block;
    pointer-events: none;
}

/* Modal Body & Split Panes */
.tree-modal-body {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: #f8fafc;
    display: flex;
    flex-direction: row;
    width: 100%;
    height: 100%;
}

.tree-pane {
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-width: 0;
    overflow: hidden;
    background-color: #f8fafc;
    background-image: 
        linear-gradient(rgba(226, 232, 240, 0.85) 1px, transparent 1px),
        linear-gradient(90deg, rgba(226, 232, 240, 0.85) 1px, transparent 1px);
    background-size: 24px 24px;
}

.tree-pane-left,
.tree-pane-right {
    flex: 1 1 50%;
}

.tree-pane-divider {
    width: 3px;
    background: #cbd5e1;
    flex-shrink: 0;
    position: relative;
    z-index: 5;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.08);
}

/* View Mode classes */
.tree-modal-body.mode-split .tree-pane-left {
    display: flex;
    flex: 1 1 50%;
}
.tree-modal-body.mode-split .tree-pane-divider {
    display: block;
}
.tree-modal-body.mode-split .tree-pane-right {
    display: flex;
    flex: 1 1 50%;
}

.tree-modal-body.mode-tree .tree-pane-left {
    display: flex;
    flex: 1 1 100%;
}
.tree-modal-body.mode-tree .tree-pane-divider {
    display: none;
}
.tree-modal-body.mode-tree .tree-pane-right {
    display: none;
}

.tree-modal-body.mode-graph .tree-pane-left {
    display: none;
}
.tree-modal-body.mode-graph .tree-pane-divider {
    display: none;
}
.tree-modal-body.mode-graph .tree-pane-right {
    display: flex;
    flex: 1 1 100%;
}

/* Individual Pane Header */
.tree-pane-header {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    backdrop-filter: blur(6px);
    flex-shrink: 0;
}

.tree-pane-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #1e293b;
}

.tree-pane-title svg,
.tree-pane-title [data-lucide] {
    width: 16px;
    height: 16px;
    color: #2563eb;
}

.tree-pane-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 600;
}

.tree-pane-badge.badge-graph {
    background: #f0fdf4;
    color: #16a34a;
    border-color: #bbf7d0;
}

.tree-pane-actions {
    display: flex;
    align-items: center;
    gap: 6px;
}

.tree-pane-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    font-size: 0.74rem;
    font-weight: 600;
    color: #475569;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.tree-pane-btn:hover {
    background: #f1f5f9;
    color: #2563eb;
    border-color: #94a3b8;
}

.tree-pane-btn svg,
.tree-pane-btn [data-lucide] {
    width: 13px;
    height: 13px;
}

/* Pane Content Container */
.tree-pane-content {
    flex: 1;
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    cursor: grab;
}

.tree-pane-content:active {
    cursor: grabbing;
}

#tree-svg-container,
#graph-svg-container {
    width: 100%;
    height: 100%;
}

/* Legend Bar */
.tree-legend-bar {
    position: absolute;
    bottom: 14px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-full, 9999px);
    padding: 6px 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 0.74rem;
    backdrop-filter: blur(8px);
    pointer-events: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.1);
    z-index: 20;
    max-width: 90%;
    flex-wrap: wrap;
    justify-content: center;
}

.tree-legend-pill {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #334155;
    font-weight: 500;
    white-space: nowrap;
}

.pill-dot {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    flex-shrink: 0;
}

.dot-solution { background: #10b981; border: 1.5px solid #059669; }
.dot-visited { background: #ffffff; border: 1.5px solid #1e293b; }
.dot-frontier { background: #8b5cf6; border: 1.5px solid #6d28d9; }
.dot-pruned { background: #ef4444; border: 1.5px solid #b91c1c; }
.dot-goal { background: #10b981; border: 1.5px solid #047857; }
.dot-obstacle { background: #cbd5e1; border: 1.5px solid #64748b; }