body {
    font-family: 'Courier New', Courier, monospace;
    background-color: #0a0a23; /* Dark blue/purple */
    color: #00ff00; /* Bright green */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    text-align: center;
}

#game-container {
    border: 2px solid #00ff00;
    padding: 20px;
    background-color: #1a1a3e; /* Slightly lighter dark blue */
    box-shadow: 0 0 15px #00ff00;
    max-width: 90%;
    width: 400px; /* Fixed width for better control, adjust as needed */
}

header h1 {
    font-size: 2em;
    text-shadow: 0 0 5px #00ff00;
    margin-bottom: 20px;
}

#level-display {
    font-size: 1.2em;
    margin-bottom: 15px;
}

#sequence-display {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    height: 80px; /* Ensure space for visual cues */
}

.cue-button {
    width: 60px;
    height: 60px;
    border: 2px solid #00cc00; /* Slightly darker green */
    background-color: #111; /* Dark background for buttons */
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    transition: background-color 0.1s, box-shadow 0.1s;
}

.cue-button.active {
    background-color: #00ff00;
    color: #0a0a23;
    box-shadow: 0 0 10px #00ff00;
}

#feedback-display {
    min-height: 20px;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.correct {
    color: #00ff00; /* Bright green for correct */
}

.incorrect {
    color: #ff0000; /* Bright red for incorrect */
}

#instructions p {
    margin: 5px 0;
}

button {
    background-color: #00ff00;
    color: #0a0a23;
    border: none;
    padding: 10px 20px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.2s, color 0.2s;
}

button:hover {
    background-color: #00cc00;
    color: #000;
}

button:disabled {
    background-color: #555;
    color: #888;
    cursor: not-allowed;
}

#win-screen {
    border: 2px solid #00ff00;
    padding: 30px;
    background-color: #1a1a3e;
    box-shadow: 0 0 20px #00ff00;
}

#win-screen h2 {
    font-size: 2.5em;
    text-shadow: 0 0 10px #00ff00;
}

footer p {
    margin-top: 20px;
    font-size: 0.9em;
    color: #00cc00;
}

/* Mobile responsiveness */
@media (max-width: 600px) {
    #game-container {
        width: 95%;
        padding: 15px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .cue-button {
        width: 50px;
        height: 50px;
        font-size: 1.2em;
    }

    #sequence-display {
        height: 70px;
    }

    button {
        padding: 8px 15px;
        font-size: 0.9em;
    }
}