.hidden {
    display: none;
}

/* Overlay */
.popup-overlay {
    display: none;
    position: fixed;
    z-index: 3000;
    left: 0; top: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.5);
}

/* Modal Box */
.popup-modal {
    background: white;
    width: 350px;
    padding: 20px;
    border-radius: 8px;

    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
}

.popup-header {
    display: flex;
    justify-content: space-between;
    font-size: 1.2em;
    font-weight: bold;
}

.popup-close {
    cursor: pointer;
    font-size: 1.2em;
}

.popup-content {
    margin-top: 10px;
}