/* Hide the (1,2,3) back-reference links next to citation labels,
   but keep the [N] label visible for singly-cited references.
   Multi-cited refs use <span class="fn-backref">(1,2)</span>.
   Single-cited refs use <a class="fn-backref">N</a> inside <span class="brackets">. */
.citation dt span.fn-backref {
    display: inline-block;
    width: 0;
    overflow: hidden;
}