/* Overlay */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

/* Activation via :target */
.overlay:target {
    opacity: 1;
    pointer-events: auto;
}

/* Fenêtre popup */
.popup {
    background: #ffffff;
    padding: 25px;
    max-width: 400px;
    width: 90%;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

/* Liens */
.open-link,
.close-link {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 4px;
    text-decoration: none;
    color: #ffffff;
}

.open-link {
    background: #007bff;
}

.close-link {
    background: #dc3545;
    margin-top: 15px;
}