.checkbox-tree {
    --checkbox-tree-indent: 18px;
    --checkbox-tree-toggle-size: 18px;
    --checkbox-tree-hover-color: #2c3e50;
    font-size: 14px;
    line-height: 1.4;
}

.checkbox-tree__item {
    margin: 1px 0;
}

.checkbox-tree__row {
    display: flex;
    align-items: center;
    min-height: 24px;
}

.checkbox-tree__toggle,
.checkbox-tree__toggle-spacer {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 var(--checkbox-tree-toggle-size);
    width: var(--checkbox-tree-toggle-size);
    height: var(--checkbox-tree-toggle-size);
    margin-right: 2px;
}

.checkbox-tree__toggle {
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font: inherit;
}

.checkbox-tree__toggle[aria-expanded="true"] {
    transform: rotate(90deg);
}

.checkbox-tree__toggle:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 1px;
}

.checkbox-tree__label {
    display: inline-flex;
    align-items: center;
    padding: 2px 0;
    cursor: pointer;
    user-select: none;
}

.checkbox-tree__item:has(> .checkbox-tree__children) > .checkbox-tree__row > .checkbox-tree__label {
    font-weight: 500;
}

.checkbox-tree__label:hover {
    color: var(--checkbox-tree-hover-color);
}

.checkbox-tree__checkbox {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    margin: 0 4px 0 0;
    cursor: pointer;
}

.checkbox-tree__checkbox:indeterminate {
    accent-color: #f39c12;
}

.checkbox-tree__children {
    margin-left: var(--checkbox-tree-indent);
}

.checkbox-tree__children[hidden] {
    display: none;
}