.series-nav {
  position: relative;
  align-items: center;
}

.series-nav > .series-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
}

.series-link,
.tag,
.meta a[href*="/categories/"],
.meta a[href*="/tags/"] {
  border: 0;
  background: transparent;
  box-shadow: none;
}

.series-topics-more {
  margin-left: auto;
}

.series-topics-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  color: var(--text);
  font: inherit;
  list-style: none;
  cursor: pointer;
}

.series-topics-toggle::-webkit-details-marker { display: none; }
.series-topics-toggle::marker { content: ""; }
.series-topics-toggle:hover { opacity: 0.65; }
.series-topics-toggle:hover span { text-decoration: underline; text-underline-offset: 0.25em; }
.series-topics-toggle svg { width: 1rem; height: 1rem; flex: none; }
.series-topics-more[open] .series-topics-toggle svg { transform: rotate(180deg); }

.series-link:focus-visible,
.tag:focus-visible,
.meta a[href*="/categories/"]:focus-visible,
.meta a[href*="/tags/"]:focus-visible,
.series-topics-toggle:focus-visible {
  outline: none;
  font-weight: 600;
  color: var(--text);
}

.series-link:focus-visible,
.tag:focus-visible,
.meta a[href*="/categories/"]:focus-visible,
.meta a[href*="/tags/"]:focus-visible,
.series-topics-toggle:focus-visible span {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.25em;
}

.series-topics-panel {
  position: absolute;
  top: calc(100% + 0.75rem);
  left: 0;
  right: 0;
  z-index: 4;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr));
  gap: 0.5rem 1rem;
  padding: 1rem;
  border: 0;
  background: var(--bg);
  box-shadow: none;
}

.series-topics-item {
  display: flex;
  align-items: center;
  min-width: 0;
  min-height: 2.75rem;
  padding: 0.25rem 0.5rem;
}

@media (max-width: 40rem) {
  .series-topics-panel { grid-template-columns: minmax(0, 1fr); }
}