body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #222;
    font-family: Arial, sans-serif;
    overflow: hidden;
    touch-action: none;
}

#game-container {
    position: relative;
    width: 320px;
    height: 480px;
    overflow: hidden;
    background: linear-gradient(to bottom, #87CEEB, #E0F7FF);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    border-radius: 10px;
}

#game-canvas {
    display: block;
}

.start-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    z-index: 10;
    text-align: center;
}

.game-over {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    z-index: 10;
    text-align: center;
}

button {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 10px 2px;
    cursor: pointer;
    border-radius: 10px;
    transition: all 0.3s;
}

button:hover {
    background-color: #45a049;
    transform: scale(1.05);
}

.score {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 24px;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.game-title {
    font-size: 36px;
    margin-bottom: 20px;
    color: #4CAF50;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
}

.instruction {
    color: #ffff00;
    font-weight: bold;
    margin: 10px 20px;
    line-height: 1.4;
}

.score-info {
    margin: 5px 0;
    font-size: 18px;
}

#toggle-sound {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: transparent;
    font-size: 24px;
    padding: 5px;
    color: white;
    cursor: pointer;
    border: none;
    z-index: 20;
}

@media (max-height: 480px) {
    #game-container {
        height: 100vh;
        border-radius: 0;
    }
}