.calculation-message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 8px;
    font-weight: 500;
    display: none;
}
.calculation-message.success {
    display: block;
    background: #e8f7e8;
    color: #2d7a2d;
    border: 1px solid #2d7a2d;
}
.calculation-message.error {
    display: block;
    background: #fde8e8;
    color: #a12b2b;
    border: 1px solid #a12b2b;
}