#produit-tabs {
    display: none;
}
/* style sticky */
#produit-tabs.sticky {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: #fff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    transition: box-shadow .3s ease;
}

/* survol / actif */
#produit-tabs .tab-link:hover,
#produit-tabs .tab-link.active {
    color: #c2a661;
}