/* ═══════════════════════════════════════════════════════════
   TreeView Component — Aerospace Professional
   ═══════════════════════════════════════════════════════════ */

.treeview-container {
    display: flex;
    gap: 1rem;
    min-height: 500px;
}

.treeview-nav {
    width: 300px;
    min-width: 300px;
    max-height: 80vh;
    overflow-y: auto;
    border: 1px solid var(--slate-200, #e2e8f0);
    border-radius: var(--radius-md, 10px);
    background: var(--white, #fff);
    padding: 0.5rem;
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.06));
}

.treeview-content {
    flex: 1;
    border: 1px solid var(--slate-200, #e2e8f0);
    border-radius: var(--radius-md, 10px);
    background: var(--white, #fff);
    padding: 1.25rem;
    overflow-y: auto;
    max-height: 80vh;
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0,0,0,0.06));
}

/* Tree items */
.treeview-item {
    padding: 0.4rem 0.6rem;
    cursor: pointer;
    border-radius: var(--radius-sm, 6px);
    font-size: 0.875rem;
    font-weight: 500;
    user-select: none;
    position: relative;
    color: var(--text-primary, #1e293b);
    transition: background-color 0.12s ease;
}

.treeview-item:hover {
    background-color: var(--slate-100, #f1f5f9);
}

.treeview-item.active {
    background-color: rgba(14, 165, 233, 0.08);
    color: var(--sky-500, #0ea5e9);
    font-weight: 600;
}

/* Expand/collapse indicator */
.treeview-item[aria-expanded]::before {
    content: "\25B6";
    display: inline-block;
    margin-right: 0.4rem;
    font-size: 0.6rem;
    transition: transform 0.15s ease;
    vertical-align: middle;
    color: var(--slate-400, #94a3b8);
}

.treeview-item[aria-expanded="true"]::before {
    transform: rotate(90deg);
    color: var(--sky-500, #0ea5e9);
}

/* Children container */
.treeview-children {
    display: none;
    padding-left: 1.2rem;
    border-left: 1px solid var(--slate-200, #e2e8f0);
    margin-left: 0.5rem;
}

.treeview-children.show {
    display: block;
}

/* Leaf items (no expand arrow) */
.treeview-item[data-type="runwayGroupItem"]::before,
.treeview-item[data-type="procedureItem"]::before {
    content: "";
    margin-right: 0;
}

/* Responsive: stack on small screens */
@media (max-width: 768px) {
    .treeview-container {
        flex-direction: column;
    }

    .treeview-nav {
        width: 100%;
        min-width: unset;
        max-height: 40vh;
    }

    .treeview-content {
        max-height: unset;
    }
}