/* Enhanced CSS for Workspace Edition */
:root {
    --primary-color: #0d6efd;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow-color: rgba(0,0,0,0.1);
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #0dcaf0;
}

body {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
}

.interactive-tree {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 10px var(--shadow-color);
    min-height: 400px;
}

.node-item {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.node-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--shadow-color);
    border-color: var(--primary-color);
}

.children {
    margin-left: 20px;
    border-left: 3px solid var(--primary-color);
    padding-left: 15px;
    margin-top: 10px;
    background: linear-gradient(90deg, rgba(13, 110, 253, 0.1), transparent);
    border-radius: 0 8px 8px 0;
}

.child-node {
    background: var(--bg-secondary);
    border-radius: 6px;
    padding: 10px;
    margin-bottom: 8px;
    transition: all 0.2s ease;
    cursor: pointer;
}

.child-node:hover {
    background: rgba(13, 110, 253, 0.15);
    transform: translateX(5px);
}

.stats-card {
    background: linear-gradient(135deg, var(--primary-color), var(--success-color));
    color: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 15px var(--shadow-color);
}

.card {
    background: var(--bg-primary);
    border-color: var(--border-color);
    border-radius: 12px;
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 4px 20px var(--shadow-color);
}

.card-header {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    border-radius: 12px 12px 0 0 !important;
}

.btn {
    border-radius: 8px;
    transition: all 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

.form-control, .form-select {
    border-radius: 8px;
    border-color: var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

@media (max-width: 768px) {
    .interactive-tree {
        padding: 15px;
    }

    .node-item {
        padding: 12px;
    }

    .children {
        margin-left: 10px;
        padding-left: 10px;
    }

    .stats-card {
        padding: 15px;
    }
}

.spinner-border {
    width: 3rem;
    height: 3rem;
}

.alert {
    border-radius: 10px;
    border: none;
    box-shadow: 0 2px 10px var(--shadow-color);
}

.badge {
    font-size: 0.75em;
    border-radius: 6px;
    padding: 0.35em 0.65em;
}