html:has(.bg-motes) {
    background-color: var(--bg);
}

body:has(.bg-motes) {
    background-color: transparent;
}

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

.bg-wavebar {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 220px;
    overflow: hidden;
}

.bg-wavebar__track {
    position: absolute;
    left: 0;
    bottom: 0;
    width: 200%;
    height: 180px;
    animation: bg-wave-slide 16s linear infinite;
}

.bg-wavebar__track--back {
    bottom: -28px;
    height: 210px;
    opacity: 0.72;
    animation: bg-wave-slide 23s linear infinite, bg-wave-swell 8s ease-in-out infinite;
}

.bg-wavebar__sheet {
    display: block;
    width: 100%;
    height: 100%;
}

.bg-wavebar__fade {
    stop-color: var(--span, #fff);
    stop-opacity: 0;
}

.bg-wavebar__solid {
    stop-color: var(--span, #fff);
    stop-opacity: 0.42;
}

.bg-wavebar__track--back .bg-wavebar__solid {
    stop-color: var(--stars, #fff);
    stop-opacity: 0.2;
}

.bg-mote {
    position: absolute;
    left: var(--x);
    top: var(--y);
    width: var(--d);
    height: var(--d);
    border-radius: 50%;
    background: radial-gradient(circle,
            var(--stars, #fff) 0%,
            color-mix(in srgb, var(--stars, #fff) 35%, transparent) 46%,
            transparent 72%);
    opacity: 0;
    animation: bg-mote-float var(--t) ease-in-out var(--delay) infinite;
}

@keyframes bg-wave-slide {
    from {
        transform: translate3d(0, 0, 0);
    }

    to {
        transform: translate3d(-50%, 0, 0);
    }
}

@keyframes bg-wave-swell {
    0%,
    100% {
        translate: 0 10px;
    }

    50% {
        translate: 0 -16px;
    }
}

@keyframes bg-mote-float {
    0% {
        opacity: 0;
        transform: translate3d(0, 0, 0) scale(var(--s0));
    }

    18% {
        opacity: var(--a);
    }

    50% {
        opacity: var(--a);
        transform: translate3d(calc(var(--dx) * 0.5), var(--wave), 0) scale(var(--s1));
    }

    82% {
        opacity: var(--a);
    }

    100% {
        opacity: 0;
        transform: translate3d(var(--dx), calc(var(--wave) * -0.4), 0) scale(var(--s0));
    }
}

@media (max-width: 768px) {
    .bg-wavebar {
        height: 140px;
    }

    .bg-wavebar__track,
    .bg-wavebar__track--back {
        height: 120px;
    }

    .bg-mote:nth-child(n + 12) {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .bg-wavebar__track,
    .bg-mote {
        animation: none;
    }

    .bg-mote {
        opacity: 0.35;
        transform: none;
    }
}