.topic-directory-tools {
  margin-block: 0 1.25rem;
}

.topic-directory-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .875rem;
}

.topic-directory-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: .375rem;
  min-height: 6rem;
  padding: 1rem 1.125rem;
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.topic-directory-card[hidden] {
  display: none;
}

.topic-directory-card:hover,
.topic-directory-card:focus-within {
  background: var(--surface-soft);
}

.topic-directory-card strong {
  font: 500 clamp(1.05rem, 2vw, 1.32rem)/1.23 Literata, Georgia, serif;
}

.topic-directory-card span,
.topic-directory-extra {
  font-size: .85rem;
  color: var(--muted);
}

.topic-directory-primary {
  display: flex;
  flex-direction: column;
  gap: .375rem;
  color: inherit;
  text-decoration: none;
}

.topic-directory-extra {
  align-self: flex-start;
  padding-block: .25rem;
  text-decoration: underline;
  text-underline-offset: .2em;
}

.topic-author-nav {
  margin-block: 1rem 1.75rem;
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: var(--surface);
}

.topic-author-nav > summary {
  display: flex;
  align-items: center;
  gap: .625rem;
  min-height: 48px;
  padding: .625rem 1rem;
  list-style: none;
  cursor: pointer;
  font-weight: 600;
}

.topic-author-nav > summary::-webkit-details-marker {
  display: none;
}

.topic-author-nav > summary::after {
  content: '';
  width: .46rem;
  height: .46rem;
  margin-inline-start: auto;
  margin-inline-end: .25rem;
  border: solid currentColor;
  border-width: 0 1.5px 1.5px 0;
  transform: translateY(-2px) rotate(45deg);
}

.topic-author-nav[open] > summary::after {
  transform: translateY(2px) rotate(225deg);
}

.topic-author-nav ul {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .25rem .5rem;
  max-height: min(19rem, 45vh);
  overflow: auto;
  margin: 0;
  padding: .5rem;
  border-top: 1px solid var(--line);
  list-style: none;
}

.topic-author-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  min-height: 44px;
  padding: .375rem .625rem;
  border-radius: .45rem;
  color: var(--ink);
  text-decoration: none;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.topic-author-nav a:hover,
.topic-author-nav a:focus-visible {
  background: var(--surface-soft);
}

.topic-author-nav a span + span {
  color: var(--muted);
  font-size: .8em;
  flex: none;
}

.topic-author-group {
  margin-block: 1.75rem;
  scroll-margin-top: .75rem;
}

.topic-author-group h3 {
  margin-bottom: .75rem;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

@media (max-width: 920px) {
  .topic-directory-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .topic-author-nav ul { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .topic-directory-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .625rem; }
  .topic-directory-card { min-height: 5.25rem; padding: .75rem; }
  .topic-directory-tools .inline-search { width: 100%; }
  .topic-author-nav ul { grid-template-columns: minmax(0, 1fr); }
}

.works-section:has([data-list-filter-count]:not(:empty)) .topic-author-nav {
  display: none;
}

.reader-tools .copy-button {
  display: inline-flex;
}