ul.menu {
    list-style: none;
    margin: 0 0 30px;
    padding: 0;
}

ul.menu li {
    cursor: pointer; 
    font-weight: normal;
}

.nav-tgl { 
    background-color: transparent;
    position: relative;  
    border: none;
    width: 30px;
    height: 20px;
    outline: none;
    -webkit-transition: opacity 0.2s ease-out;
    transition: opacity 0.2s ease-out; 
}

.nav-tgl:before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
    right: auto;
    width: 100%;
    background: -webkit-linear-gradient(top, #5E5E5E, #5E5E5E 20%, transparent 20%, transparent 40%, #5E5E5E 40%, #5E5E5E 60%, transparent 60%, transparent 80%, #5E5E5E 80%, #5E5E5E 100%);
    background: linear-gradient(to bottom, #5E5E5E, #5E5E5E 20%, transparent 20%, transparent 40%, #5E5E5E 40%, #5E5E5E 60%, transparent 60%, transparent 80%, #5E5E5E 80%, #5E5E5E 100%);
    -webkit-transition: opacity 0.2s ease-out, width 0.2s 0.2s ease-out;
    transition: opacity 0.2s ease-out, width 0.2s 0.2s ease-out;
}

.nav-tgl:after {
    opacity: 0;
    content: '×';
    color: white;
    position: fixed; 
    font-size: 50px;
    line-height: 0;
    -webkit-transition: opacity 0.4s ease-out;
    transition: opacity 0.4s ease-out;
} 

.nav-tgl:hover {
    opacity: 1;
}

.open .nav-tgl {
    opacity: 1;
    z-index: 2;
}

.open .nav-tgl:before {
    opacity: 0;
    width: 0;
}

.open .nav-tgl:after {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0) rotate(360deg);
    transform: translate3d(0, 0, 0) rotate(360deg);
    -webkit-transition: opacity 0.4s 1s ease-out, -webkit-transform 0.4s 1s ease-out;
    transition: opacity 0.4s 1s ease-out, -webkit-transform 0.4s 1s ease-out;
    transition: transform 0.4s 1s ease-out, opacity 0.4s 1s ease-out;
    transition: transform 0.4s 1s ease-out, opacity 0.4s 1s ease-out, -webkit-transform 0.4s 1s ease-out;
}

nav.full-screen {
    z-index: 1;
    position: fixed;
    top: -100%;
    right: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    overflow: hidden;
}

nav.full-screen:before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    margin: auto;
    background: rgba(0, 0, 0, 0.98);
    width: 100%;
    height: 0;
    padding-bottom: 100%;
    border-radius: 100%;
    -webkit-transform: scale(0.04) translateY(9999px);
    transform: scale(0.04) translateY(9999px);
    overflow: hidden;
}

.open nav.full-screen {
    top: 0;
}

.open nav.full-screen:before {
    -webkit-animation: menu-animation 0.8s ease-out forwards;
    animation: menu-animation 0.8s ease-out forwards;
}

.menu-wrap {
    position: absolute;
    top: 50%;
    left: 50%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    /*-webkit-perspective: 1000;
    perspective: 1000;*/
    -webkit-transform: translate3d(-50%, -50%, 0);
    transform: translate3d(-50%, -50%, 0); 
    padding-top: 80px;
}

.menu-wrap .column {
    opacity: 0; 
    -webkit-transform: translate3d(0, 36px, 0);
    transform: translate3d(0, 36px, 0);
} 

.open .menu-wrap .column {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    -webkit-transition: opacity 0.2s ease-out, -webkit-transform 0.2s ease-out;
    transition: opacity 0.2s ease-out, -webkit-transform 0.2s ease-out;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out;
    transition: transform 0.2s ease-out, opacity 0.2s ease-out, -webkit-transform 0.2s ease-out;
}

.open .menu-wrap .column:nth-child(1) {
    -webkit-transition-delay: 0.75s;
    transition-delay: 0.75s;
}

.open .menu-wrap .column:nth-child(2) {
    -webkit-transition-delay: 0.85s;
    transition-delay: 0.85s;
}

.open .menu-wrap .column:nth-child(3) {
    -webkit-transition-delay: 0.95s;
    transition-delay: 0.95s;
}

.open .menu-wrap .column:nth-child(4) {
    -webkit-transition-delay: 1.05s;
    transition-delay: 1.05s;
} 

@-webkit-keyframes menu-animation {
    0% {
        opacity: 0;
        -webkit-transform: scale(0.04) translateY(300%);
        transform: scale(0.04) translateY(300%);
    }
    40% {
        -webkit-transform: scale(0.04) translateY(0);
        transform: scale(0.04) translateY(0);
        -webkit-transition: ease-out;
        transition: ease-out;
    }
    40% {
        -webkit-transform: scale(0.04) translateY(0);
        transform: scale(0.04) translateY(0);
    }
    60% {
        opacity: 1;
        -webkit-transform: scale(0.02) translateY(0px);
        transform: scale(0.02) translateY(0px);
    }
    61% {
        -webkit-transform: scale(0.04);
        transform: scale(0.04);
    }
    99.9% {
        height: 0;
        padding-bottom: 100%;
        border-radius: 100%;
    }
    100% {
        -webkit-transform: scale(2);
        transform: scale(2);
        height: 100%;
        padding-bottom: 0;
        border-radius: 0;
    }
}

@keyframes menu-animation {
    0% {
        opacity: 0;
        -webkit-transform: scale(0.04) translateY(300%);
        transform: scale(0.04) translateY(300%);
    }
    40% {
        -webkit-transform: scale(0.04) translateY(0);
        transform: scale(0.04) translateY(0);
        -webkit-transition: ease-out;
        transition: ease-out;
    }
    40% {
        -webkit-transform: scale(0.04) translateY(0);
        transform: scale(0.04) translateY(0);
    }
    60% {
        opacity: 1;
        -webkit-transform: scale(0.02) translateY(0px);
        transform: scale(0.02) translateY(0px);
    }
    61% {
        -webkit-transform: scale(0.04);
        transform: scale(0.04);
    }
    99.9% {
        height: 0;
        padding-bottom: 100%;
        border-radius: 100%;
    }
    100% {
        -webkit-transform: scale(2);
        transform: scale(2);
        height: 100%;
        padding-bottom: 0;
        border-radius: 0;
    }
}