/* ── Content back-link ─────────────────────────
   The "← 返回" link above the article on research
   and knowledge topic pages (their sidebar
   navigation is hidden; the link lives in the
   content area, so it survives hide: toc).
   ─────────────────────────────────────────── */

.back-link {
  margin-bottom: 0.6rem;
  font-size: 0.8rem;
}