/* ============================================================
   FONDO DE FIBRA ÓPTICA
   El canvas #fibra-bg se pinta detrás de todo el contenido.
   Las secciones con fondo "papel" lo tapan; las que usan el fondo
   general se vuelven translúcidas para dejar ver los hilos.
============================================================ */
#fibra-bg{position:fixed;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none;background:var(--fondo)}
body{background:transparent}
.hero{background:
    radial-gradient(900px 480px at 85% -10%, rgba(87,182,214,.16), transparent 65%),
    radial-gradient(700px 460px at -8% 100%, rgba(75,190,126,.13), transparent 65%),
    rgba(245,247,252,.72)}
.solicitud{background:rgba(245,247,252,.80)}
section:not([class]),section#faq,section#seccionVideos,.proceso{background:rgba(245,247,252,.78)}
.nosotros{background:rgba(245,247,252,.84)}
.kpis,.planes,.cobertura,.contacto{background:rgba(255,255,255,.94)}
.checker,.tarjeta,.paso,.plan,.formulario,.sol-card,.reco,.muni{backdrop-filter:blur(2px)}
@media(prefers-reduced-motion:reduce){#fibra-bg{opacity:.55}}