body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(to bottom, #1e3c72, #2a5298);
    font-family: Arial, sans-serif;
    color: white;
    user-select: none;
}

@media (max-width: 360px) {
    body {
        font-size: 12px;
    }
}

@media (min-width: 361px) and (max-width: 720px) {
    body {
        font-size: 14px;
    }
}

@media (min-width: 721px) and (max-width: 1080px) {
    body {
        font-size: 16px;
    }
}

@media (min-width: 1081px) and (max-width: 1440px) {
    body {
        font-size: 18px;
    }
}

@media (min-width: 1441px) {
    body {
        font-size: 20px;
    }
}

.game-container {
    text-align: center;
    user-select: none;
}

canvas {
    background-color: rgba(255,255,255,0.1);
    border: 2px solid white;
    display: block;
    margin: 10px auto;
    user-select: none;
}

.controls {
    margin-top: 10px;
    user-select: none;
}

.controls button {
    width: 60px;
    height: 60px;
    margin: 5px;
    font-size: 30px;
    border-radius: 10px;
    border: none;
    background-color: rgba(255,255,255,0.3);
    color: white;
    touch-action: manipulation;
    user-select: none;
}

.controls button:active {
    background-color: rgba(255,255,255,0.6);
    user-select: none;
}

#score {
    font-size: 20px;
    margin-top: 10px;
    user-select: none;
}

.back-button {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background-color: #007BFF;
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    border-radius: 8px;
    user-select: none;
}

.back-button:hover {
    background-color: #0056b3;
    user-select: none;
}