/* ─── back button (cc/ 全ページ共通) ──────────────────────── */
.back {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none;
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: .08em;
  padding: 8px 14px 8px 12px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: color-mix(in oklab, var(--cream-2) 60%, transparent);
  transition: transform .18s ease, border-color .18s ease, color .18s ease;
}
.back:hover {
  transform: translateX(-2px);
  border-color: var(--navy);
  color: var(--navy);
}
.back .egg {
  display: inline-block; width: 8px; height: 10px;
  background: var(--pale);
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}