body {
    background-color: #0d1117;
    color: #c9d1d9;
    font-family: 'Courier New', Courier, monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

#game-container {
    text-align: center;
    background: #161b22;
    padding: 20px 40px;
    border-radius: 10px;
    border: 1px solid #30363d;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

h1 {
    color: #58a6ff;
    margin-bottom: 5px;
    letter-spacing: 2px;
}

#instruction {
    font-size: 14px;
    color: #8b949e;
    margin-bottom: 20px;
}

canvas {
    background-color: #010409;
    border: 1px solid #30363d;
    border-radius: 5px;
    cursor: pointer;
}

#status {
    margin-top: 20px;
    font-weight: bold;
    height: 20px;
}

.success {
    color: #2ea043;
}

button {
    margin-top: 15px;
    background-color: #21262d;
    color: #c9d1d9;
    border: 1px solid #30363d;
    padding: 8px 16px;
    border-radius: 5px;
    cursor: pointer;
    font-family: inherit;
    transition: 0.2s;
}

button:hover {
    background-color: #30363d;
    border-color: #8b949e;
}