.fondo-muertos {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.fondo-muertos::before,
.fondo-muertos::after {
    content: "";
    position: absolute;
    inset: 0;
    background-size: 120px 120px;
}

.fondo-muertos::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cg fill='%238e3fd1'%3E%3Ccircle cx='39.0' cy='30.0' r='4'/%3E%3Ccircle cx='36.4' cy='36.4' r='4'/%3E%3Ccircle cx='30.0' cy='39.0' r='4'/%3E%3Ccircle cx='23.6' cy='36.4' r='4'/%3E%3Ccircle cx='21.0' cy='30.0' r='4'/%3E%3Ccircle cx='23.6' cy='23.6' r='4'/%3E%3Ccircle cx='30.0' cy='21.0' r='4'/%3E%3Ccircle cx='36.4' cy='23.6' r='4'/%3E%3Ccircle cx='30' cy='30' r='4.5'/%3E%3Ccircle cx='99.0' cy='90.0' r='4'/%3E%3Ccircle cx='96.4' cy='96.4' r='4'/%3E%3Ccircle cx='90.0' cy='99.0' r='4'/%3E%3Ccircle cx='83.6' cy='96.4' r='4'/%3E%3Ccircle cx='81.0' cy='90.0' r='4'/%3E%3Ccircle cx='83.6' cy='83.6' r='4'/%3E%3Ccircle cx='90.0' cy='81.0' r='4'/%3E%3Ccircle cx='96.4' cy='83.6' r='4'/%3E%3Ccircle cx='90' cy='90' r='4.5'/%3E%3Cpath fill-rule='evenodd' d='M90 23c-6 0-9 4-9 8.5 0 3.5 2 5.5 4 6.4v2.6h10v-2.6c2-.9 4-2.9 4-6.4 0-4.5-3-8.5-9-8.5ZM86.4 29.5a2.6 2.6 0 1 0 .01 0ZM93.6 29.5a2.6 2.6 0 1 0 .01 0ZM90 34.2l-1.2 2h2.4Z'/%3E%3Cpath fill-rule='evenodd' d='M30 83c-6 0-9 4-9 8.5 0 3.5 2 5.5 4 6.4v2.6h10v-2.6c2-.9 4-2.9 4-6.4 0-4.5-3-8.5-9-8.5ZM26.4 89.5a2.6 2.6 0 1 0 .01 0ZM33.6 89.5a2.6 2.6 0 1 0 .01 0ZM30 94.2l-1.2 2h2.4Z'/%3E%3Cpath d='M60 54l6 6-6 6-6-6Z'/%3E%3Cpath d='M0 -6l6 6-6 6-6-6Z'/%3E%3Cpath d='M120 -6l6 6-6 6-6-6Z'/%3E%3Cpath d='M0 114l6 6-6 6-6-6Z'/%3E%3Cpath d='M120 114l6 6-6 6-6-6Z'/%3E%3Ccircle cx='60' cy='12' r='1.4'/%3E%3Ccircle cx='60' cy='24' r='1.4'/%3E%3Ccircle cx='60' cy='36' r='1.4'/%3E%3Ccircle cx='60' cy='84' r='1.4'/%3E%3Ccircle cx='60' cy='96' r='1.4'/%3E%3Ccircle cx='60' cy='108' r='1.4'/%3E%3Ccircle cx='12' cy='60' r='1.4'/%3E%3Ccircle cx='24' cy='60' r='1.4'/%3E%3Ccircle cx='36' cy='60' r='1.4'/%3E%3Ccircle cx='84' cy='60' r='1.4'/%3E%3Ccircle cx='96' cy='60' r='1.4'/%3E%3Ccircle cx='108' cy='60' r='1.4'/%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.06;
}

.fondo-muertos::after {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cg fill='%23ffb21f'%3E%3Ccircle cx='39.0' cy='30.0' r='4'/%3E%3Ccircle cx='36.4' cy='36.4' r='4'/%3E%3Ccircle cx='30.0' cy='39.0' r='4'/%3E%3Ccircle cx='23.6' cy='36.4' r='4'/%3E%3Ccircle cx='21.0' cy='30.0' r='4'/%3E%3Ccircle cx='23.6' cy='23.6' r='4'/%3E%3Ccircle cx='30.0' cy='21.0' r='4'/%3E%3Ccircle cx='36.4' cy='23.6' r='4'/%3E%3Ccircle cx='30' cy='30' r='4.5'/%3E%3Ccircle cx='99.0' cy='90.0' r='4'/%3E%3Ccircle cx='96.4' cy='96.4' r='4'/%3E%3Ccircle cx='90.0' cy='99.0' r='4'/%3E%3Ccircle cx='83.6' cy='96.4' r='4'/%3E%3Ccircle cx='81.0' cy='90.0' r='4'/%3E%3Ccircle cx='83.6' cy='83.6' r='4'/%3E%3Ccircle cx='90.0' cy='81.0' r='4'/%3E%3Ccircle cx='96.4' cy='83.6' r='4'/%3E%3Ccircle cx='90' cy='90' r='4.5'/%3E%3Cpath fill-rule='evenodd' d='M90 23c-6 0-9 4-9 8.5 0 3.5 2 5.5 4 6.4v2.6h10v-2.6c2-.9 4-2.9 4-6.4 0-4.5-3-8.5-9-8.5ZM86.4 29.5a2.6 2.6 0 1 0 .01 0ZM93.6 29.5a2.6 2.6 0 1 0 .01 0ZM90 34.2l-1.2 2h2.4Z'/%3E%3Cpath fill-rule='evenodd' d='M30 83c-6 0-9 4-9 8.5 0 3.5 2 5.5 4 6.4v2.6h10v-2.6c2-.9 4-2.9 4-6.4 0-4.5-3-8.5-9-8.5ZM26.4 89.5a2.6 2.6 0 1 0 .01 0ZM33.6 89.5a2.6 2.6 0 1 0 .01 0ZM30 94.2l-1.2 2h2.4Z'/%3E%3Cpath d='M60 54l6 6-6 6-6-6Z'/%3E%3Cpath d='M0 -6l6 6-6 6-6-6Z'/%3E%3Cpath d='M120 -6l6 6-6 6-6-6Z'/%3E%3Cpath d='M0 114l6 6-6 6-6-6Z'/%3E%3Cpath d='M120 114l6 6-6 6-6-6Z'/%3E%3Ccircle cx='60' cy='12' r='1.4'/%3E%3Ccircle cx='60' cy='24' r='1.4'/%3E%3Ccircle cx='60' cy='36' r='1.4'/%3E%3Ccircle cx='60' cy='84' r='1.4'/%3E%3Ccircle cx='60' cy='96' r='1.4'/%3E%3Ccircle cx='60' cy='108' r='1.4'/%3E%3Ccircle cx='12' cy='60' r='1.4'/%3E%3Ccircle cx='24' cy='60' r='1.4'/%3E%3Ccircle cx='36' cy='60' r='1.4'/%3E%3Ccircle cx='84' cy='60' r='1.4'/%3E%3Ccircle cx='96' cy='60' r='1.4'/%3E%3Ccircle cx='108' cy='60' r='1.4'/%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.13;
    -webkit-mask-image: radial-gradient(circle at 4% 96%, #000, transparent 38%), radial-gradient(circle at 99% 42%, #000, transparent 32%), radial-gradient(circle at 38% 0%, #000, transparent 26%), radial-gradient(circle at 86% 104%, #000, transparent 30%);
    mask-image: radial-gradient(circle at 4% 96%, #000, transparent 38%), radial-gradient(circle at 99% 42%, #000, transparent 32%), radial-gradient(circle at 38% 0%, #000, transparent 26%), radial-gradient(circle at 86% 104%, #000, transparent 30%);
}

.fondo-muertos__luz {
    position: absolute;
    width: var(--tamano);
    height: var(--tamano);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 150, 40, 0.2), rgba(255, 110, 20, 0.08) 38%, transparent 68%);
    transform: translate(-50%, -50%);
    animation: fondo-muertos-respirar var(--duracion) ease-in-out var(--retraso) infinite alternate;
}

@keyframes fondo-muertos-respirar {
    0% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(0.9);
    }

    45% {
        opacity: 0.85;
    }

    55% {
        opacity: 0.75;
    }

    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.06);
    }
}

@media (prefers-reduced-motion: reduce) {
    .fondo-muertos__luz {
        animation: none;
        opacity: 0.8;
    }
}