#music-toggle {
    position: fixed;
    bottom: 15px;
    left: 15px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: #fff;
    box-shadow: 0 3px 10px rgba(0,0,0,0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

    #music-toggle:hover {
        transform: scale(1.1);
        box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    #music-toggle img {
        width: 25px;
        height: 25px;
        pointer-events: none;
    }

/* Hiệu ứng rung, xoay và phát sáng đỏ đậm */
.vibrating {
    animation: pulse 1.2s infinite, rotate 4s linear infinite, glow 2s ease-in-out infinite;
    box-shadow: 0 0 15px rgba(139, 0, 0, 0.6), 0 0 25px rgba(139, 0, 0, 0.4);
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05) rotate(1deg);
    }

    100% {
        transform: scale(1) rotate(-1deg);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes glow {
    0% {
        box-shadow: 0 0 10px rgba(139, 0, 0, 0.2), 0 0 20px rgba(139, 0, 0, 0.2);
    }

    50% {
        box-shadow: 0 0 20px rgba(139, 0, 0, 0.6), 0 0 30px rgba(139, 0, 0, 0.5);
    }

    100% {
        box-shadow: 0 0 10px rgba(139, 0, 0, 0.2), 0 0 20px rgba(139, 0, 0, 0.2);
    }
}