/* Style du fond sombre */
.overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease;
}
/* Style de la popup */
.popup {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    position: absolute;
}
.overlay.active {
    visibility: visible;
    opacity: 1;
}
.btn-close {
    margin-top: 10px;
    padding: 8px 15px;
    background: red;
    color: white;
    border: none;cursor: pointer;
}