@media(min-width: 992px) {
    /* sub-menu styles */
    .nav ul .sub-menu {
        left: 0;
        max-height: 0;
        position: absolute;
        top: 100%;
        z-index: 0;

        -webkit-perspective: 400px;
        -moz-perspective: 400px;
        -ms-perspective: 400px;
        -o-perspective: 400px;
        perspective: 400px;
    }
    .nav ul .sub-menu li {
        opacity: 0;
        -webkit-transform: translateY(100%);
        -moz-transform: translateY(100%);
        -ms-transform: translateY(100%);
        -o-transform: translateY(100%);
        transform: translateY(100%);

        -webkit-transition: opacity .4s, -webkit-transform .5s;
        -moz-transition: opacity .4s, -moz-transform .5s;
        -ms-transition: opacity .4s, -ms-transform .5s;
        -o-transition: opacity .4s, -o-transform .5s;
        transition: opacity .4s, transform .5s;
    }
    #header .nav ul li > .mega-menu,
    #header .nav ul.menu > li {
        -webkit-perspective: 400px;
        -moz-perspective: 400px;
        -ms-perspective: 400px;
        -o-perspective: 400px;
        perspective: 400px;       
    }
    #header .nav ul li > .mega-menu > ul,
    #header .nav ul.menu > li > ul {
        opacity:0; overflow: hidden;
        -webkit-transform: rotateX(-90deg);
        -moz-transform: rotateX(-90deg);
        -ms-transform: rotateX(-90deg);
        -o-transform: rotateX(-90deg);
        transform: rotateX(-90deg);
        -webkit-transform-origin: 0 0;
        -moz-transform-origin: 0 0;
        -ms-transform-origin: 0 0;
        -o-transform-origin: 0 0;
        transform-origin: 0 0;
    }
    #header .nav ul li:hover > .mega-menu > ul,
    #header .nav ul.menu > li:hover > ul {
        opacity:1; overflow: visible;
        -webkit-transform: rotateX(0);
        -moz-transform: rotateX(0);
        -ms-transform: rotateX(0);
        -o-transform: rotateX(0);
        transform: rotateX(0);
    }
    .nav ul .sub-menu li:hover a {
        border-radius: 0;
    }
    .nav ul li:hover .sub-menu, .nav ul li:focus .sub-menu {
        max-height: 2000px;
        z-index: 10;
    }
    .nav ul li:hover > .sub-menu > li, .nav ul li:focus > .sub-menu > li,
    #header .nav ul li:hover > .mega-menu,
    #header .nav ul li:hover > .mega-menu li, #header .nav ul li:focus .mega-menu li {
        opacity: 1;
        -webkit-transform: none;
        -moz-transform: none;
        -ms-transform: none;
        -o-transform: none;
        transform: none;
        z-index: 20000
    }


    /* CSS3 delays for transition effects */
    .nav ul li:hover .sub-menu li:nth-child(1) {
        -webkit-transition-delay: 0s;
        -moz-transition-delay: 0s;
        -ms-transition-delay: 0s;
        -o-transition-delay: 0s;
        transition-delay: 0s;
    }
    .nav ul li:hover .sub-menu li:nth-child(2) {
        -webkit-transition-delay: 50ms;
        -moz-transition-delay: 50ms;
        -ms-transition-delay: 50ms;
        -o-transition-delay: 50ms;
        transition-delay: 50ms;
    }
    .nav ul li:hover .sub-menu li:nth-child(3) {
        -webkit-transition-delay: 100ms;
        -moz-transition-delay: 100ms;
        -ms-transition-delay: 100ms;
        -o-transition-delay: 100ms;
        transition-delay: 100ms;
    }
    .nav ul li:hover .sub-menu li:nth-child(4) {
        -webkit-transition-delay: 150ms;
        -moz-transition-delay: 150ms;
        -ms-transition-delay: 150ms;
        -o-transition-delay: 150ms;
        transition-delay: 150ms;
    }
    .nav ul li:hover .sub-menu li:nth-child(5) {
        -webkit-transition-delay: 200ms;
        -moz-transition-delay: 200ms;
        -ms-transition-delay: 200ms;
        -o-transition-delay: 200ms;
        transition-delay: 200ms;
    }
    .nav ul li:hover .sub-menu li:nth-child(6) {
        -webkit-transition-delay: 250ms;
        -moz-transition-delay: 250ms;
        -ms-transition-delay: 250ms;
        -o-transition-delay: 250ms;
        transition-delay: 250ms;
    }
    .nav ul li:hover .sub-menu li:nth-child(7) {
        -webkit-transition-delay: 300ms;
        -moz-transition-delay: 300ms;
        -ms-transition-delay: 300ms;
        -o-transition-delay: 300ms;
        transition-delay: 300ms;
    }
    .nav ul li:hover .sub-menu li:nth-child(8) {
        -webkit-transition-delay: 350ms;
        -moz-transition-delay: 350ms;
        -ms-transition-delay: 350ms;
        -o-transition-delay: 350ms;
        transition-delay: 350ms;
    }

    .sub-menu li:nth-child(1) {
        -webkit-transition-delay: 350ms;
        -moz-transition-delay: 350ms;
        -ms-transition-delay: 350ms;
        -o-transition-delay: 350ms;
        transition-delay: 350ms;
    }
    .sub-menu li:nth-child(2) {
        -webkit-transition-delay: 300ms;
        -moz-transition-delay: 300ms;
        -ms-transition-delay: 300ms;
        -o-transition-delay: 300ms;
        transition-delay: 300ms;
    }
    .sub-menu li:nth-child(3) {
        -webkit-transition-delay: 250ms;
        -moz-transition-delay: 250ms;
        -ms-transition-delay: 250ms;
        -o-transition-delay: 250ms;
        transition-delay: 250ms;
    }
    .sub-menu li:nth-child(4) {
        -webkit-transition-delay: 200ms;
        -moz-transition-delay: 200ms;
        -ms-transition-delay: 200ms;
        -o-transition-delay: 200ms;
        transition-delay: 200ms;
    }
    .sub-menu li:nth-child(5) {
        -webkit-transition-delay: 150ms;
        -moz-transition-delay: 150ms;
        -ms-transition-delay: 150ms;
        -o-transition-delay: 150ms;
        transition-delay: 150ms;
    }
    .sub-menu li:nth-child(6) {
        -webkit-transition-delay: 100ms;
        -moz-transition-delay: 100ms;
        -ms-transition-delay: 100ms;
        -o-transition-delay: 100ms;
        transition-delay: 100ms;
    }
    .sub-menu li:nth-child(7) {
        -webkit-transition-delay: 50ms;
        -moz-transition-delay: 50ms;
        -ms-transition-delay: 50ms;
        -o-transition-delay: 50ms;
        transition-delay: 50ms;
    }
    .sub-menu li:nth-child(8) {
        -webkit-transition-delay: 0s;
        -moz-transition-delay: 0s;
        -ms-transition-delay: 0s;
        -o-transition-delay: 0s;
        transition-delay: 0s;
    }
}