/* --- 固定音频播放器 --- */
.audio-toggle-btn {
    position: fixed;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: transparent;
    border: 3px solid #FFD700;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    overflow: hidden;
}

.audio-toggle-btn .cd-album-art {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-size: cover;
    background-position: center;
    animation: rotate 20s linear infinite;
    animation-play-state: paused;
}

.audio-toggle-btn .cd-center {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: #FFD700;
    border-radius: 50%;
    z-index: 2;
}

.audio-toggle-btn .cd-icon {
    position: relative;
    z-index: 1;
    color: #0F172A;
}

.audio-toggle-btn:hover {
    transform: translateY(-50%) scale(1.1);
}

.audio-toggle-btn.playing .cd-album-art {
    animation-play-state: running;
}

.audio-toggle-btn.paused .cd-album-art {
    animation-play-state: paused;
}



@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}