.chapter-nav {
  position: relative;
  z-index: 8;
  padding: 0 0 1.5rem;
  background: transparent;
}

.chapter-tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 0;
  max-width: none;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.chapter-tabs li {
  margin: 0;
  padding: 0;
}

.chapter-tab {
  display: inline-grid;
  width: 3rem;
  height: 2.5rem;
  padding: 0;
  place-items: center;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  font: 700 .8rem/1 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: .04em;
  text-decoration: none;
}

.chapter-tab[href]:hover {
  color: var(--accent-text);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.chapter-tab:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.chapter-tab[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.chapter-tab.is-upcoming {
  color: var(--muted);
  cursor: default;
  opacity: .42;
}

@media (max-width: 46rem) {
  .chapter-nav { padding-inline: .5rem; }
  .chapter-tabs { gap: .25rem; }
}

@media print {
  .chapter-nav { display: none; }
}