#mic-btn.recording {
    color: #ff4444;
    animation: pulseRecording 1.5s infinite;
    will-change: transform, opacity;
}

@keyframes pulseRecording {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.6; }
    100% { transform: scale(1); opacity: 1; }
}