.tree-select {
    position: relative;
    width: 100%;
    font-family: Arial, sans-serif;
}

.tree-select-input {
    border: 1px solid #ccc;
    border-radius: 4px;
    padding: 4px 8px;
    cursor: pointer;
    background: white;
    user-select: none;
}

.tree-select-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 2px);
    left: 0;
    right: 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: white;
    max-height: 300px;
    overflow-y: auto;
    z-index: 999;
}

.tree-select.open .tree-select-dropdown {
    display: block;
}

.tree-row {
    display: flex;
    align-items: center;
    border-bottom: 1px solid #f2f2f2;
}

.tree-title {
    flex: 1;
    padding: 10px 12px;
    cursor: pointer;
}

.tree-title:hover {
    background: #f5f5f5;
}

.tree-arrow {
    width: 40px;
    text-align: center;
    cursor: pointer;
    padding: 10px 0;
    border-left: 1px solid #eee;
    color: #777;
}

.tree-arrow:hover {
    background: #f5f5f5;
}

.tree-back {
    padding: 10px 12px;
    cursor: pointer;
    font-weight: bold;
    border-bottom: 1px solid #ddd;
}

.tree-back:hover {
    background: #f5f5f5;
}