body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    transition: background 0.3s, color 0.3s;
}

/* Tema Light */
body {
    background-color: #f4f4f4;
    color: #333;
}

/* Tema Dark (applicato via JS) */
body.dark-theme {
    background-color: #333;
    color: #f4f4f4;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #ccc;
    padding-bottom: 10px;
}

button {
    padding: 10px 15px;
    cursor: pointer;
}