.wc-mpc-calculator-wrapper {
    background: #f9f9f9;
    border: 1px solid #e1e1e1;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 4px;
}

.wc-mpc-calculator-wrapper h4 {
    margin-top: 0;
    margin-bottom: 15px;
}

.wc-mpc-field {
    margin-bottom: 15px;
}

.wc-mpc-field label {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
}

.wc-mpc-field input[type="number"],
.wc-mpc-field input[type="text"] {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}

.wc-mpc-field input[readonly] {
    background-color: #eee;
}

.wc-mpc-results p {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 0;
    color: #333;
}