body {
    background-color: #0d1117;
    color: #c9d1d9;
    font-family: monospace;
    text-align: center;
    margin: 0;
    padding: 0;
}
.hidden { display: none; }
button {
    background: #58a6ff;
    color: #fff;
    border: none;
    padding: 12px 20px;
    margin: 10px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
}
button:hover {
    background: #1f6feb;
}
#canvas-container {
    margin: 20px auto;
    border: 1px solid #30363d;
    border-radius: 10px;
    width: 1000px;
    height: 600px;
}
#leaderboard-container {
    margin-top: 20px;
    background: #161b22;
    padding: 10px;
    border-radius: 8px;
}
#leaderboard li {
    text-align: left;
    color: #c9d1d9;
}