body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f4f4f9;
    margin-top: 100px;
}
h1 {
    color: #FF9900;
}
button {
    padding: 10px 20px;
    font-size: 16px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
button:hover {
    background-color: #0056b3;
}

#version-footer {
    position: fixed;
    bottom: 8px;
    right: 12px;
    font-size: 11px;
    color: #999;
    cursor: pointer;
    user-select: none;
}
#version-footer:hover {
    color: #666;
}