/* Match the dashboard's approved three-row navigation on the Codex volumes. */
nav.book-nav {
  justify-content: center;
  padding: 8px 0 0;
  border-bottom: 6px double #2A4070;
}
nav.book-nav .nav-tier {
  display: flex;
  flex-basis: 100%;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
nav.book-nav .chamber-tier { margin-top: 8px; border-top: 1px solid #2A4070; padding: 12px 12px 16px; }
nav.book-nav .chamber-link {
  padding: 3px 24px;
  font-size: .95rem;
  font-weight: bold;
  color: var(--gold);
}
nav.book-nav .chamber-link .ch-num {
  font-size: 1.2em;
  line-height: 1;
  margin-left: 4px;
}
nav.book-nav .volume-tier {
  border-top: 1px solid #2A4070;
  padding: 16px 12px 8px;
}
nav.book-nav .volume-tier a {
  padding: 6px 20px;
  font-weight: bold;
  color: var(--gold);
  text-align: center;
}
nav.book-nav .volume-tier small {
  display: block;
  font-size: .62rem;
  font-weight: normal;
  color: #7C8AA0;
}