body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f9f9f9;
    touch-action: none;
}
#game-container {
    text-align: center;
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
h1 {
    margin-top: 0;
    color: #333;
    font-size: 1.5rem;
}
canvas {
    border: 2px dashed #ccc;
    border-radius: 10px;
    background-color: #fff;
    cursor: crosshair;
    display: block;
    margin: 0 auto 1rem auto;
}
#clearBtn {
    background-color: #ff9800;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
}
#clearBtn:active {
    transform: scale(0.95);
}