body, html {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: Arial, sans-serif;
    background-color: #f0f4f8;
}
canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    touch-action: none;
}
#infoPanel, #levelSelect {
    position: absolute;
    background: rgba(255,255,255,0.9);
    padding: 10px;
    border-radius: 5px;
    font-size: 14px;
    z-index: 1000;
}
#infoPanel {
    top: 10px;
    left: 10px;
}
#levelSelect {
    top: 10px;
    right: 10px;
    display: flex;
    flex-direction: column;
}
button {
    margin-top: 5px;
    padding: 5px 10px;
}
#levelSelect label {
    margin-bottom: 5px;
}