.fondo-radial-claro {
  background-image: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(99, 102, 241, 0.25), transparent 70%);
  background-color: #000000; /* opcional: fondo oscuro como capa base */
  z-index: -10;
  position: fixed;
  inset: 0;
}