.references-dropdown {
  margin: 2em 0 1em;
  border-top: 1px solid #ddd;
  border-bottom: 1px solid #ddd;
}

.references-dropdown > summary {
  cursor: pointer;
  padding: 0.7em 0;
  font-size: 1.15em;
  font-weight: 700;
  list-style: none;
}

.references-dropdown > summary::-webkit-details-marker {
  display: none;
}

.references-dropdown > summary::before {
  content: "\25B8";
  display: inline-block;
  width: 1em;
  transition: transform 0.15s ease;
}

.references-dropdown[open] > summary::before {
  transform: rotate(90deg);
}

.references-dropdown > #refs {
  padding-bottom: 1em;
  font-size: 0.9em;
}

/* Footnotes follow the collapsed references, so they get their own title. */
.footnotes-end-of-document > hr {
  display: none;
}

.footnotes-end-of-document::before {
  content: "Notas";
  display: block;
  margin: 1.5em 0 0.4em;
  font-size: 1.15em;
  font-weight: 700;
}