/* 光粒子アニメーション */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    background: rgba(180, 180, 255, 0.7);
    border-radius: 50%;
    filter: blur(2px);
    animation: float 12s infinite ease-in-out;
}

@keyframes float {
    0% {
        transform: translateY(0) translateX(0);
        opacity: 0.2;
    }
    50% {
        opacity: 0.8;
    }
    100% {
        transform: translateY(-200px) translateX(40px);
        opacity: 0;
    }
}