body {
    background: #000020 url('https://www.transparenttextures.com/patterns/stardust.png');
    color: #fff;
    font-family: 'Orbitron', Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#gameCanvas {
    display: block;
    margin: 40px auto 0 auto;
    border: 4px solid #00f0ff;
    background: transparent;
    box-shadow: 0 0 30px #00f0ff;
    position: relative;
    z-index: 1;
}

#scoreBoard {
    position: absolute;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: #00f0ff;
    text-shadow: 0 0 10px #00f0ff;
    z-index: 2;
}

#startScreen, #gameOverScreen {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 40, 0.95);
    border: 3px solid #00f0ff;
    border-radius: 16px;
    padding: 40px 60px;
    text-align: center;
    z-index: 100;
    box-shadow: 0 0 40px #00f0ff;
}

#gameOverScreen {
    display: none;
}

button {
    background: #00f0ff;
    color: #000020;
    border: none;
    border-radius: 8px;
    padding: 12px 32px;
    font-size: 1.2rem;
    font-family: 'Orbitron', Arial, sans-serif;
    cursor: pointer;
    margin-top: 20px;
    box-shadow: 0 0 10px #00f0ff;
    transition: background 0.2s, color 0.2s;
}
button:hover {
    background: #fff;
    color: #00f0ff;
}