/* 本文とレイアウトは本採用Fのまま。背景だけの試作。 */
body {
  background-image: radial-gradient(ellipse at 2% 30%, #aab7a866, transparent 38%), radial-gradient(ellipse at 98% 78%, #bcb08d55, transparent 35%);
  background-attachment: fixed;
}
#ambient-3d { visibility: hidden; }
#ambient-3d[data-ready="true"] { visibility: visible; }
@media print { #ambient-3d { display: none; } body { background-image: none; } }