.retrovault-sitemap details summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.retrovault-sitemap details summary::-webkit-details-marker {
    display: none;
}
.retrovault-sitemap details > summary::after {
    content: "+";
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1;
    color: #28a745;
    margin-left: auto;
    padding-left: 1rem;
}
.retrovault-sitemap details[open] > summary::after {
    content: "\2212";
    color: #dc3545;
}
.retrovault-sitemap details summary a {
    pointer-events: auto;
}

/* Semantic tree: auto-fill columns */
.retrovault-sitemap-tree > ul {
    columns: 300px auto;
    column-gap: 2rem;
    list-style: none;
    padding: 0;
}
.retrovault-sitemap-tree > ul > li {
    break-inside: avoid;
    margin-bottom: 1.5rem;
}