/* Shared navigation for the standalone experiments. */
.home-return {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 100;
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 13px;
  border: 1px solid #dce3d747;
  border-radius: 999px;
  background: #101713e8;
  color: #edf4e8;
  box-shadow: 0 4px 18px #0004;
  font: 12px/1.4 'Segoe UI', 'Microsoft YaHei', sans-serif;
  letter-spacing: .2px;
  text-decoration: none;
  backdrop-filter: blur(10px);
}
.home-return:hover { background: #263a2a; border-color: #dce3d780; }
.home-return:focus-visible { outline: 2px solid #d7ef8b; outline-offset: 4px; }
/* Leave the experiment's bottom controls free of the return link. */
body:has(#universe) .home-return { bottom: 150px; }
@media (max-width: 600px) {
  .home-return { font-size: 11px; min-height: 36px; padding: 7px 11px; }
  body:has(#universe) .home-return { right: 20px; bottom: 172px; }
}