body {
    margin: 0;
    overflow: hidden;
    font-family: 'Roboto', sans-serif;
}

/* Optional UI Overlay for non-VR instructions */
#instructions {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px;
    border-radius: 8px;
    pointer-events: none; /* Let clicks pass through to canvas */
    z-index: 100;
}