body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #1c1c1c;
    color: white;
}

.header {
    background-color: #7b0000;
    text-align: center;
    padding: 20px 10px 10px;
}

.logo {
    width: 220px;
    max-width: 90%;
    height: auto;
}

.slogan {
    margin-top: 10px;
    font-size: 1.2rem;
    color: white;
}

.calculator {
    background-color: #2b2b2b;
    margin: 30px auto;
    padding: 25px;
    max-width: 400px;
    border-radius: 15px;
    box-shadow: 0 0 15px gold;
    text-align: center;
}

label {
    font-weight: bold;
    color: gold;
    display: block;
    margin-top: 15px;
    text-align: left;
}

input, select {
    width: 100%;
    padding: 10px;
    font-size: 1rem;
    margin-top: 5px;
    border: 2px solid gold;
    border-radius: 5px;
    background-color: black;
    color: white;
}

button {
    margin-top: 20px;
    background-color: darkred;
    color: white;
    padding: 12px;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    width: 100%;
}

#resultado {
    margin-top: 20px;
    font-size: 1.3rem;
    color: gold;
}

.whatsapp-button {
    display: block;
    margin-top: 20px;
    background-color: #25D366;
    color: white;
    text-align: center;
    padding: 12px;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1.1rem;
}