/* TCS Sound Toggle Button - Include on all pages */
.sound-toggle-btn {
    background: rgba(0, 212, 255, 0.15);
    border: 1px solid rgba(0, 212, 255, 0.4);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}
.sound-toggle-btn:hover {
    background: rgba(0, 212, 255, 0.3);
    box-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
    transform: scale(1.1);
}
.sound-toggle-btn.muted {
    opacity: 0.5;
    background: rgba(100, 100, 100, 0.2);
    border-color: rgba(100, 100, 100, 0.4);
}

/* Fixed position variant for subpages */
.sound-toggle-fixed {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    width: 44px;
    height: 44px;
    font-size: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}