.lecture-topnav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: -2.25rem 0 3rem;
  padding: .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.lecture-topnav-label {
  font-size: .62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-3);
  white-space: nowrap;
}

.lecture-topnav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: .25rem;
}

.lecture-topnav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  border: 1px solid transparent;
  border-radius: 5px;
  text-decoration: none;
  color: var(--text-2);
  font-size: .78rem;
  font-weight: 700;
  line-height: 1;
  transition: color .12s, background .12s, border-color .12s;
}

.lecture-topnav a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.lecture-topnav a.current {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: var(--accent-line);
}

.lecture-topnav a.lecture-home {
  min-width: 2.75rem;
}

@media (max-width: 520px) {
  .lecture-topnav {
    align-items: flex-start;
    margin: -.5rem 0 2rem;
  }

  .lecture-topnav-links {
    justify-content: flex-start;
  }

  .lecture-topnav a {
    min-width: 1.85rem;
    height: 1.85rem;
  }

  .lecture-topnav a.lecture-home {
    min-width: 2.5rem;
  }
}