.theme-aurora #particle-canvas,
.theme-hologram #particle-canvas {
    opacity: 0.7;
    mix-blend-mode: screen;
}

.theme-noir #particle-canvas {
    opacity: 0.25;
}

.theme-volcano #particle-canvas,
.theme-solarflare #particle-canvas {
    opacity: 0.5;
}

.theme-arctic #particle-canvas {
    opacity: 0.28;
    filter: blur(0.1px) saturate(0.9);
}

.theme-aurora::before,
.theme-hologram::before,
.theme-volcano::before,
.theme-solarflare::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(255,255,255,0.08), transparent 18%),
        radial-gradient(circle at 90% 15%, rgba(255,255,255,0.05), transparent 16%);
    mix-blend-mode: screen;
}