body {
    font-family: Arial, sans-serif;
    background-color: #f9f9f9;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 500px;
    background: #fff;
    margin: 50px auto;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h1 {
    text-align: center;
    color: #d32f2f;
}
label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}
input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border-radius: 4px;
    border: 1px solid #ccc;
}
button {
    margin-top: 20px;
    width: 100%;
    padding: 10px;
    font-size: 16px;
    background-color: #d32f2f;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
button:hover {
    background-color: #b71c1c;
}
.resultado {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
    text-align: center;
}
.nota {
    font-size: 14px;
    color: #555;
    margin-top: 20px;
    text-align: justify;
}