.wpbpc-container {
    background: #f8f8f8;
    border-radius: 15px;
    padding: 20px;
    max-width: 400px;
    margin: 20px auto;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    font-family: sans-serif;
}
.wpbpc-container label {
    display: block;
    margin-top: 10px;
    font-weight: bold;
}
.wpbpc-container input,
.wpbpc-container select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border-radius: 6px;
    border: 1px solid #ccc;
}
#wpbpc-calc-btn, #wpbpc-addcart-btn {
    background: #0066ff;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 10px 15px;
    margin-top: 15px;
    cursor: pointer;
    width: 100%;
}
#wpbpc-result {
    font-size: 18px;
    margin-top: 15px;
    text-align: center;
}