#btnpdf{
    display: none;
}
/* Responsive pour la section "Choisissez un document" */
@media screen and (max-width: 768px) {
    section.fond-photo4 {
        flex-direction: column;
        align-items: center;
        padding: 10px;
    }

    section.fond-photo4 > div:first-child {
        width: 100%;
    }

    #pdf-frame {
        width: 100% !important;
        height: 400px;
    }

    section.fond-photo4 > div:last-child {
        width: 100%;
        max-width: none;
        margin-top: 20px;
        opacity: 0.95;
        padding: 10px;
        box-sizing: border-box;

        display: grid;
        grid-template-columns: 1fr 1fr; /* DEUX colonnes */
        gap: 10px 15px;
    }

    /* titre et bouton prennent les deux colonnes */
    section.fond-photo4 > div:last-child h2,
    section.fond-photo4 > div:last-child button {
        grid-column: span 2;
        text-align: center;
    }

    /* chaque label devient une colonne */
    section.fond-photo4 > div:last-child label {
        display: flex;
        flex-direction: column;
        margin-left: 0 !important; /* supprimer le margin-left inline */
    }

    section.fond-photo4 select {
        width: 100%;
    }
    #pdf-frame{
        display: none;
    }
    #btnpdf{
        display: grid;
    }
}