MediaWiki:Common.css

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/* Hide nested items initially */
.portal .body ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.portal .body ul ul {
    display: none; /* Hide by default */
    margin-left: 1em;
}

/* Style for collapsible headers */
.portal .collapsible-header {
    cursor: pointer;
    font-weight: bold;
    position: relative;
    padding-left: 15px;
}

.portal .collapsible-header::before {
    content: "▶";
    position: absolute;
    left: 0;
    transition: transform 0.2s ease;
}

.portal .collapsible-header.open::before {
    transform: rotate(90deg);
}