#calc-modal {
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.calc-modal-content {
    background: #fff;
    max-width: 400px;
    margin: 10% auto;
    padding: 20px;
    border-radius: 10px;
    text-align: left;
    box-shadow: 0 0 10px rgba(0,0,0,0.3);
}

.calc-modal-content label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.calc-modal-content input {
    width: 100%;
    padding: 8px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

#calc-result {
    margin-top: 10px;
    font-weight: bold;
}

.hidden {
    display: none !important;
}