/* Compact, language-independent "Back to top" */

a.back-to-top {
  font-size: 0 !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;

  width: 2rem;
  height: 2rem;

  text-decoration: none !important;
  border-radius: 50%;
}

a.back-to-top::after {
  content: "↑" !important;
  display: block !important;

  font-size: 1.6rem !important;
  font-weight: 700 !important;
  line-height: 1 !important;
}

/* Make interaction more visible */
a.back-to-top:hover,
a.back-to-top:focus {
  background-color: rgba(0, 0, 0, 0.10);
  text-decoration: none !important;
}

a.back-to-top:hover::after,
a.back-to-top:focus::after {
  transform: translateY(-2px);
}

/* To the left */
.toc-filter > a.back-to-top {
  display: flex !important;
  margin-inline-start: auto;
  margin-inline-end: 0;
  opacity: 0.55;
  transition: opacity 0.2s ease;
}

.toc-filter > a.back-to-top:hover,
.toc-filter > a.back-to-top:focus-visible {
  opacity: 1;
}