body {
    font-size: 16px;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #000000;
    font-family: system-ui;
    overflow: hidden;
}

#threejs-canvas {
    width: 100vw;
    height: 100vh;
    display: block;
}

.play-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.5s ease-in-out;
}

.play-button {
    padding: 25px 50px;
    font-size: 28px;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease-in-out;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.play-button:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.8);
    transform: scale(1.05);
    box-shadow: 0 6px 40px rgba(0, 0, 0, 0.2);
}

.play-button:active {
    transform: scale(0.98);
}

.hidden {
    display: none !important;
}
.stereo-controls {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px;
    border-radius: 5px;
    color: white;
    font-family: Arial, sans-serif;
}

.stereo-controls button {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 5px 15px;
    margin: 0 5px;
    border-radius: 3px;
    cursor: pointer;
    transition: background 0.2s;
}

.stereo-controls button:hover {
    background: rgba(255, 255, 255, 0.3);
}

.stereo-controls button.active {
    background: rgba(255, 255, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.8);
}

.stereo-controls label {
    margin-right: 10px;
}