.confetti {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh; /* 画面全体 */
    background: #ffffff10;
    overflow: hidden;
    z-index: 9999;
    pointer-events: none;
}

.confetti > span {
    display: block;
    position: absolute;
    opacity: 0;
}

.confetti > span > span {
    display: block;
    width: 100%;
    height: 100%;
}

.confetti > span > span > span {
    display: block;
    width: 100%;
    height: 100%;
}

@keyframes rotateY {
    0% {
        transform: rotateY(0deg);
    }
    100% {
        transform: rotateY(360deg);
    }
}

@keyframes rotate360 {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* 光るエフェクトのアニメーション */
@keyframes glow {
    0% {
        box-shadow: 0 0 0px white;
        transform: scale(1);
    }
    50% {
        box-shadow: 0 0 10px 5px white;
        transform: scale(1.2);
    }
    100% {
        box-shadow: 0 0 0px white;
        transform: scale(1);
    }
}

.glow {
    animation: glow 1s linear infinite;
}