* {
    box-sizing: border-box;
}

.xiip nav {
    display: none;
}

.xiip nav ul {
    display: flex;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

.xiip nav ul li a {
    padding: 0.5rem;
    display:block;
}

.xiip nav ul li ul {
    display:none;
    position: absolute;
    top: 100%;
    left: 0;
    flex-direction: column;
}

.xiip nav.open {
    display: block;
    position:fixed;
    top: 0;
    right: 0;
    bottom:0;
    left:1rem;
    background-color: #333;
    color: #fff;
    padding: 1rem;
    z-index: 1000;
    animation: slideInFromRight 0.5s ease-in-out forwards;
}

.xiip nav.open ul {
    height:100%;
    width:100%;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.xiip nav.open ul li {
    width:100%;
    text-align: center;
}

.xiip .nav-trigger {
    position: relative;
    z-index:1002;
}

.xiip nav.open ul li ul.open {
    display: flex;
    position: fixed;
    top: 0;
    right: 0;
    left:1rem;
    background-color: #222;
    z-index: 1001;
    animation: slideInFromRight 0.5s ease-in-out forwards;
}

.xiip nav.open ul li ul.open.close,
.xiip nav.open.close {
    animation: slideOutToRight 0.5s ease-in-out forwards;
}

.xiip nav.open ul li ul.open li a.back {
    color:#999;
}

.xiip nav.open ul li ul.open li a.back .icon {
    width:12px;
    height:12px;
}

.xiip nav.open ul li ul.open li a.back .icon .line-item {
    stroke:#999;
}

@keyframes slideInFromRight {
    0% {
        transform: translateX(100%);
    }
    100% {
        transform: translateX(0);
    }
}

@keyframes slideOutToRight {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(100%);
    }
}

@media (min-width: 992px) {
    .xiip .nav-trigger {
        display: none;
    }

    .xiip nav {
        display: block;
    }

    .xiip nav ul li {
        position: relative;
    }

    .xiip nav ul li:hover ul {
        display: flex;
    }
}