.category-post-tree {
    list-style: none;
    padding-left: 0;
}
.category-post-tree li {
    margin: 4px 0;
}
.toggle-item {
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 6px;
}
.arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}
.collapsible {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    margin-left: 1em;
    padding-left: 1em;
}
.collapsible.open {
    max-height: 1000px;
}
.category-post-tree a {
    text-decoration: none;
    color: #333;
}
.category-post-tree a:hover {
    text-decoration: underline;
}


.category-post-tree ul {
	list-style-type: none;
}

.current-post > a {
    color: #333;
    font-weight: bold;
}