/* Audio Toggle Button */
.audio-btn {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 2000;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--ink-black);
    color: var(--sun-yellow);
    border: 2px solid var(--paper-bg);
    box-shadow: 4px 4px 0px var(--clay-red);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s;
    font-size: 1.2rem;
}

.audio-btn:hover {
    transform: scale(1.1);
    box-shadow: 6px 6px 0px var(--clay-red);
}

.audio-btn.playing {
    background: var(--clay-red);
    color: var(--paper-bg);
    box-shadow: 4px 4px 0px var(--ink-black);
    animation: pulseBeat 2s infinite;
}

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

    50% {
        transform: scale(1.1);
    }

    100% {
        transform: scale(1);
    }
}