MediaWiki:Common.css

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/* Categories (single star) - Bold and slightly larger */
#mw-panel .vector-pinnable-element > ul > li {
    font-weight: bold;
    font-size: 110%; /* Slightly larger font */
    color: #000; /* Default black for categories */
}

/* Subcategories (double star) - Normal size and weight */
#mw-panel .vector-pinnable-element > ul > li > ul > li {
    font-weight: normal;
    font-size: 100%; /* Normal font size */
    color: #555; /* Dark gray for subcategories */
}