body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #0a0a0a;
    color: white;
    text-align: center;
}

.centered {
    padding-top: 20vh;
}

button {
    padding: 12px 24px;
    font-size: 1rem;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

button:hover {
    background-color: #0056b3;
}

.hidden {
    display: none;
}