/* Ergänzungen zu mdb/js/seite.js (Ersatz für MDB-, Bootstrap- und jQuery-JS) */

/* Knopf „nach oben“ blendet weich ein und aus */
.back-to-top {
    transition: opacity .3s, visibility .3s;
}

.back-to-top.pb-ausgeblendet {
    opacity: 0;
    visibility: hidden;
}

/* Parallax: Höhe und Lage der Bildebene setzt seite.js (Rechnung wie jarallax) */
.pb-parallax-rahmen {
    position: relative;
    overflow: hidden;
    isolation: isolate;
}

.pb-parallax {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    z-index: -1;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
    .back-to-top {
        transition: none;
    }
}

/* Navigation unter 992 px: Bootstrap-Collapse unter der Navbar, Untermenüs
   klappen über den Pfeil auf (mdb/js/seite.js) */
.pb-untermenue {
    display: none;
}

@media (max-width: 991.98px) {
    .navbar.fixed-top .navbar-collapse {
        max-height: calc(100vh - 70px);
        overflow-y: auto;
        margin: .5rem -1rem 0;
        background: #fff;
        box-shadow: 0 6px 10px rgba(0, 0, 0, .15);
    }

    .navbar-collapse .navbar-nav {
        padding-left: 0;
    }

    .navbar .navbar-nav .nav-item,
    .navbar .navbar-nav .dropdown-item {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        border-top: 1px solid #eee;
    }

    .navbar .navbar-nav .nav-item > a,
    .navbar .navbar-nav .dropdown-item > a {
        flex: 1;
        padding: .75rem 1rem;
    }

    .navbar .navbar-nav .dropdown-menu .nav-item > a,
    .navbar .navbar-nav .dropdown-menu .dropdown-item > a {
        padding-left: 2rem;
    }

    .navbar .navbar-nav .drop2 a {
        padding-left: 3rem !important;
    }

    .pb-untermenue {
        display: block;
        width: 3rem;
        align-self: stretch;
        border: 0;
        border-left: 1px solid #eee;
        background: transparent;
        color: #0081c7;
        font-size: 1.25rem;
    }

    .pb-untermenue i {
        transition: transform .2s;
    }

    .pb-offen > .pb-untermenue i {
        transform: rotate(180deg);
    }

    /* Hover-Aufklappen vom Desktop hier abschalten */
    .navbar .nav-item:hover .drop1,
    .navbar .dropdown-item:hover .drop2,
    .navbar .dropdown-menu {
        display: none !important;
        position: static !important;
        flex-basis: 100%;
        float: none;
        border: 0;
        box-shadow: none;
    }

    .navbar .navbar-nav .nav-item.pb-offen > .drop1,
    .navbar .navbar-nav .dropdown-item.pb-offen > .drop2 {
        display: block !important;
    }
}

@media (min-width: 992px) {
    .navbar-expand-lg .navbar-toggler {
        display: none;
    }
}