/**
 * Navigation Tree Component
 *
 * Hierarchical navigation tree with expandable/collapsible nodes.
 * Includes selection states and node counts.
 */

/* ===== Navigation Tree ===== */

.nav-tree {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.nav-tree__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.nav-tree__header h3 {
    margin: 0;
}

.nav-tree__collapse-all {
    background: none;
    border: 1px solid var(--color-border);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.nav-tree__collapse-all:hover {
    background: var(--color-bg-light);
}

.nav-tree__content {
    padding: var(--space-sm);
}

.nav-tree__empty {
    color: var(--color-text-light);
    text-align: center;
    padding: var(--space-xl);
}

.nav-node {
    margin-bottom: 0.25rem;
}

.nav-node__header {
    display: flex;
    align-items: center;
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.nav-node__header:hover {
    background: var(--color-bg-light);
}

.nav-node__header--selected {
    background: rgba(59, 130, 246, 0.1);
}

.nav-node__toggle,
.nav-node__link {
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    width: 100%;
    text-align: left;
    padding: 0;
}

.nav-node__icon {
    font-size: 0.9rem;
}

.nav-node__label {
    flex: 1;
    font-size: 0.95rem;
}

.nav-node__count {
    background: var(--color-bg-dark);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
}

.nav-node__children {
    padding-left: 1.5rem;
    overflow: hidden;
}

.nav-node__children--expanded {
    margin-top: 0.25rem;
}