/* NEULA Particle Background */
#particles-bg {
    position: fixed; top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
    overflow: hidden;
}
.particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    animation: particleDrift linear infinite;
    opacity: 0;
}
@keyframes particleDrift {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 0.3; }
    100% { transform: translateY(-10vh) scale(1.5); opacity: 0; }
}