:root {
  --teach-shell-border: #d9d0c2;
  --teach-shell-bg: rgba(255, 253, 248, 0.96);
  --teach-shell-text: #13212b;
  --teach-shell-link: #0a6f84;
}

.teach-publish-nav {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--teach-shell-border);
  color: var(--teach-shell-text);
  font: 0.9rem/1.4 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.teach-publish-link {
  color: var(--teach-shell-link);
  text-decoration: none;
}

.teach-publish-link:hover,
.teach-publish-link:focus-visible {
  text-decoration: underline;
}

.teach-publish-separator {
  color: #718096;
}

.teach-publish-spacer {
  flex: 1 1 auto;
}

.teach-publish-link-disabled {
  min-width: 1rem;
}

/* Long source identifiers are common in lessons; allow them to wrap on phones
   while preserving horizontal scrolling for preformatted code blocks. */
.teach-publish-nav ~ main code {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.teach-publish-nav ~ main pre code {
  overflow-wrap: normal;
  word-break: normal;
}

.teach-publish-nav ~ main .step,
.teach-publish-nav ~ main .card {
  min-width: 0;
  overflow-wrap: anywhere;
}

@media (max-width: 560px) {
  .teach-publish-nav {
    width: calc(100% - 1.25rem);
    flex-wrap: wrap;
    gap: 0.45rem;
    padding-top: max(0.7rem, env(safe-area-inset-top));
  }

  .teach-publish-spacer {
    display: none;
  }

  .teach-publish-previous,
  .teach-publish-next {
    max-width: 48%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}