.fixed-header {
    position: relative; /* contesto per la barra assoluta */
}

.header-mobile-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background-color: #111517;
    z-index: 999;
    pointer-events: none;

    opacity: 0;
    transform: translateY(-100%);
    transition: opacity .3s ease, transform .3s ease;
}

.header-mobile-bg.is-visible {
    opacity: 1;
    transform: translateY(0);
}

header.fixed-header .header-logo,
header.fixed-header .menu-icon {
    z-index: 1000 !important;
}

header.fixed-header .header-mobile-bg {
    z-index: 999 !important;
}