* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
}

.game-container {
    text-align: center;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

.score-container {
    font-size: 1.2em;
    margin-bottom: 15px;
}

#gameCanvas {
    border: 2px solid #333;
    background-color: #fff;
    max-width: 100%;
    touch-action: none; /* 防止触摸设备上的默认行为 */
}

#startBtn {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1.1em;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#startBtn:hover {
    background-color: #45a049;
}

.controls-info {
    margin: 15px 0;
    color: #666;
    font-size: 0.9em;
}

/* 响应式设计 */
@media (max-width: 600px) {
    .game-container {
        padding: 10px;
        width: 100%;
    }

    h1 {
        font-size: 1.5em;
    }

    #gameCanvas {
        width: 100%;
        height: auto;
    }
}