body {
    font-family: Arial, sans-serif;
    background: #04507d;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.calculadora {
    background: rgb(255, 255, 255);
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    padding: 20px;
    max-width: 400px;
    width: 100%;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

select {
    width: 100%;
    padding: 8px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.resistencia {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 20px 0;
}

.cable {
    width: 30px;
    height: 10px;
    background: #c0c0c0;
}

.cuerpo {
    background: #d2b48c;
    width: 200px;
    height: 60px;
    border-radius: 5px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0 10px;
}

.banda {
    width: 12px;
    height: 50px;
    border-radius: 2px;
    background: gray;
}

.selectores {
    margin: 20px 0;
}

button {
    background: #4c89af;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
    margin-top: 10px;
}

button:hover {
    background: #3c6d8b;
}

#resultado {
    margin-top: 20px;
    padding: 10px;
    background: #f8f8f8;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;
}

#divBanda3, #divPPM {
    display: none;
}