/* Sound FAB (floating action button) */
.sound-fab {
    position: fixed;
    bottom: 20px;
    right: 76px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--accent-gold);
    background: var(--btn-secondary);
    color: var(--accent-gold);
    font-size: 1.4em;
    cursor: pointer;
    z-index: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: background 0.2s, transform 0.2s, opacity 0.2s;
}

.sound-fab:hover {
    background: var(--btn-secondary-hover);
    transform: scale(1.08);
}

.sound-fab.muted {
    opacity: 0.5;
    border-color: #888;
    color: #888;
}

/* Mobile */
@media (max-width: 600px) {
    .sound-fab {
        bottom: 12px;
        right: 62px;
        width: 42px;
        height: 42px;
        font-size: 1.2em;
    }
}