/* efecto — fallback sin WebGL: fondo de píxeles en CSS (el sitio sigue completo) */
html.no-webgl #voxels { display: none; }
html.no-webgl body::before { content: ""; position: fixed; inset: -2% 0; z-index: 0; pointer-events: none;
background-image: url("data:image/svg+xml;utf8,"), url("data:image/svg+xml;utf8,");
background-size: 576px 576px, 384px 384px; background-position: 0 0, 120px 60px;
-webkit-mask-image: radial-gradient(120% 90% at 70% 40%, #000 20%, rgba(0,0,0,.45) 70%, rgba(0,0,0,.2));
mask-image: radial-gradient(120% 90% at 70% 40%, #000 20%, rgba(0,0,0,.45) 70%, rgba(0,0,0,.2));
animation: efx-px-drift 90s steps(90) infinite; }
@keyframes efx-px-drift { to { background-position: -576px 576px, 120px 444px; } }
html.no-webgl .efx-rail { mix-blend-mode: normal; }
@media (prefers-reduced-motion: reduce) { html.no-webgl body::before { animation: none; } }