body {
    font-family: 'Arial', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
    color: #333;
}

#container {
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 90%;
    width: 500px;
}

h1 {
    color: #0056b3;
    margin-bottom: 20px;
}

.input-group {
    margin-bottom: 20px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

input {
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    text-align: center;
    font-size: 1em;
}

button {
    padding: 15px 30px;
    font-size: 1.2em;
    color: white;
    background-color: #007bff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    margin-bottom: 25px;
    transition: transform 0.1s;
}

button:active { transform: scale(0.98); }

#risultato {
    margin-top: 20px;
    font-size: 1.3em;
    font-weight: bold;
    padding: 20px;
    border: 2px solid #007bff;
    border-radius: 8px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}