body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background: #0f0f0f;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #fff;
}

.game-container {
    text-align: center;
    width: 350px;
    padding: 20px;
    background: #111;
    border-radius: 12px;
    box-shadow: 0 0 20px #0ff;
}

.game-screen {
    margin: 20px 0;
    height: 50px;
    background: #222;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 15px #0ff inset;
}

.obstacle-line {
    height: 100%;
    width: 100%;
    background: #0f0;
    transition: background 0.2s ease;
}

.controls button {
    margin: 5px;
    padding: 8px 15px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: #fff;
    background: #0ff;
    box-shadow: 0 0 10px #0ff;
    transition: all 0.2s ease;
}

.controls button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.score {
    font-size: 18px;
    margin-top: 10px;
}

#message {
    margin-top: 10px;
    font-weight: bold;
    font-size: 16px;
}