.popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}
.popup-content {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    width: 40%;
    max-width: 500px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.2);
    animation: fadeIn 0.5s ease-in-out;
}
.popup-close {
    cursor: pointer;
    font-size: 20px;
    position: absolute;
    top: 10px;
    right: 10px;
}
.popup-close:hover {
    opacity: 0.7;
}
.popup-message {
    font-size: 16px;
    line-height: 1.5;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translate(-50%, -60%); }
    to { opacity: 1; transform: translate(-50%, -50%); }
}