body {
    margin: 0;
    padding: 20px;
    background-color: #f0f8ff;
    font-family: "Comic Sans MS", "微软雅黑", sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

#game-container {
    text-align: center;
    background-color: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    position: relative;
}

h1 {
    color: #ff6600;
    margin-bottom: 5px;
}

#controls {
    margin: 8px 0 12px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    gap: 8px;
    align-items: center;
}

#controls select {
    padding: 6px 10px;
    border-radius: 8px;
    border: 2px solid #00bcd4;
    font-weight: bold;
    background: #e0f7fa;
}

#speed-indicator {
    color: #009688;
}

#score-board {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 10px;
    color: #333;
}

canvas {
    background-color: #e0f7fa; /* Sky blue */
    border: 3px solid #00bcd4;
    border-radius: 10px;
    display: block;
    margin: 0 auto;
}

#game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(255, 255, 255, 0.9);
    padding: 20px;
    border-radius: 10px;
    border: 2px solid #ff0000;
}

.hidden {
    display: none;
}

button {
    background-color: #ff9800;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

button:hover {
    background-color: #e68a00;
}