@keyframes breathing {
    0% {
        transform: scale(1);
        box-shadow: 0 0 5px rgba(0,0,0,0.2);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 15px rgba(0,0,0,0.4);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 5px rgba(0,0,0,0.2);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #121212;
    color: #e0e0e0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#main-container {
    width: 90%;
    max-width: 800px;
    background-color: #1e1e1e;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border: 1px solid #333;
}

#header {
    text-align: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid #333;
    padding-bottom: 1rem;
}

#header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: 1px;
}

#header p {
    margin-top: 0.5rem;
    color: #aaa;
    font-size: 1rem;
}

#controls-panel {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

#master-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

button {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: #333;
    color: #e0e0e0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

button:hover {
    background-color: #4CAF50;
    color: white;
}

button:active {
    transform: translateY(1px);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

#start-stop-btn.playing {
    background-color: #F44336;
}
#start-stop-btn.playing:hover {
    background-color: #d32f2f;
}

#freeze-btn.frozen {
    background-color: #2196F3;
    color: white;
}
#freeze-btn.frozen:hover {
    background-color: #1976D2;
}


#synth-params {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.param {
    position: relative;
}

.param label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #ccc;
}

.param input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: #333;
    border-radius: 5px;
    outline: none;
    cursor: pointer;
}

.param input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #4CAF50;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s ease;
}

.param input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #4CAF50;
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s ease;
}

.param input[type="range"]:hover::-webkit-slider-thumb {
    background: #5cdb5e;
}
.param input[type="range"]:hover::-moz-range-thumb {
    background: #5cdb5e;
}


.tooltip {
    visibility: hidden;
    width: 200px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.85rem;
    line-height: 1.4;
}

.param:hover .tooltip {
    visibility: visible;
    opacity: 1;
}

#visualizer-container {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #333;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.voice-viz {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: #2a2a2a;
    border: 2px solid #444;
    transition: all 0.2s ease-in-out;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-weight: bold;
    font-size: 1.2rem;
    animation: breathing 8s ease-in-out infinite;
}