CodePen Embed - Uber-like Navigation

<header>
  <div class="nav">
    <div class="title">
      Navigation
    </div>
    <div class="toggle">
      <div class="bar"></div>
    </div>
    
    <nav class="">
      <div class="showcase">
        <div class="showcase-container">
          <ul class="showcase-menu">
            <li>Hi!</li>
            <li>Hover over the list items or click them!</li>
            <li><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/124740/ice-final-white.svg" alt=""></li>
            <li class="overlay" style="background-image:url(https://images.unsplash.com/photo-1537949721120-e8f21f6698e6?ixlib=rb-0.3.5&s=96527c5eff0b3bd24946f77f4dc5a789&auto=format&fit=crop&w=634&q=80);">
              Lorem ipsum
            </li>
            <li style="background-image:url(https://d2kbkpwf98wmwo.cloudfront.net/images/menu/motion.png);"></li>
            <li>ABC</li>
            <li style="background-image:url(https://images.unsplash.com/photo-1537914675540-ec9f82fbd752?ixlib=rb-0.3.5&s=7d427165e9b4e7aa8d80b19c9d0b3128&auto=format&fit=crop&w=1316&q=80);"></li>
            <li style="background-image:url(https://d2kbkpwf98wmwo.cloudfront.net/images/menu/color.png);"></li>
          </ul>
        </div>
      </div>
      
      <div class="menu">
        <ul class="main-menu">
          <li class="active"><a href="#!">Introduction</a></li>
          <li><a href="#!">The System</a></li>
          <li><a href="#!">Logo</a></li>
          <li><a href="#!">Composition</a></li>
          <li><a href="#!">Motion</a></li>
          <li><a href="#!">Typography</a></li>
          <li><a href="#!">Photography</a></li>
          <li><a href="#!">Color</a></li>
        </ul>
      </div>
    </nav>
    
  </div>
</header>

<div class="content">
  <p>
    Navigation like on the <a href="https://www.uber.design/case-studies/rebrand-2018" target="_blank">Uber Rebrand Site</a>
  </p>
</div>

@import url('https://fonts.googleapis.com/css?family=Noto+Sans:400,700');

$main: #EF3340;

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Noto Sans', sans-serif;
}

*::selection {
  background: rgba(0,0,0,.2);
  color: #fff;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  overflow: hidden;
  display: flex;
  transition: padding .5s cubic-bezier(.25,.46,.45,.94);
}

a {
  text-decoration: none;
  color: $main;
}

header {
  z-index: 5;
  opacity: 0;
  transition: opacity .5s cubic-bezier(.25,.46,.45,.94);
  
  .nav {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 80px;
    
    .title {
      line-height: 80px;
      padding: 0 120px;
      font-size: 24px;
      color: #fff;
      font-weight: 900;
    }
    
    .toggle {
      position: absolute;
      margin: auto;
      width: 46px;
      height: 46px;
      right: 120px;
      top: 0;
      bottom: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 10;
      cursor: pointer;
      
      .bar {
        position: relative;
        width: 40px;
        height: 2px;
        background: #fff;
        
        &:before, &:after {
          content: '';
          position: absolute;
          width: 100%;
          height: 100%;
          background: inherit;
          left: 0;
          transform-origin: center center;
          transition: transform .25s ease, top .25s ease, bottom .25s ease;
        }
        
        &:before {
          top: -10px;
        }
        
        &:after {
          bottom: -10px;
        }
      }
      
      &.clicked {
        .bar {
          background: transparent;
          
          &:before, &:after {
            background: #000;
          }
          
          &:before {
            transform: rotate(45deg);
            top: 0;
          }
          &:after {
            transform: rotate(-45deg);
            bottom: 0;
          }
        }
      }
    }
    
    nav {
      position: fixed;
      left: 0;
      top: 0;
      width: 100vw;
      height: 100vh;
      display: flex;
      flex-direction: row;
      opacity: 0;
      z-index: 5;
      transition: opacity .5s ease;
      
      .showcase {
        background: #000;
        flex: 1;
        color: #fff;
        display: flex;
        justify-content: center;
        align-items: center;
        
        .showcase-container {
          width: 50%;
          position: relative;
          overflow: hidden;
          
          &:before {
            content: '';
            display: block;
            padding-top: 100%;
          }
        }
        
        .showcase-menu {
          position: absolute;
          left: 0;
          top: 0;
          width: 100%;
          height: 100%;
          overflow-y: visible;
          list-style-type: none;
          transition: top .25s ease;
          
          
          li {
            width: 100%;
            height: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 40px;
            text-transform: uppercase;
            text-align: center;
            overflow: hidden;
            background-position: center center;
            background-repeat: no-repeat;
            background-size: cover;
            position: relative;
            z-index: 1;
            
            &.overlay {
              &:before {
                content: '';
                position: absolute;
                left: 0;
                top: 0;
                right: 0;
                bottom: 0;
                background: rgba(0,0,0,.6);
                z-index: -1;
              }
            }
          }
        }
      }
      
      .menu {
        background: #fff;
        flex: 1;
        
        ul {
          width: 100%;
          padding: 80px 48px 24px 48px;
          list-style-type: none;
          max-height: 100%;
          overflow-y: auto;
          
          &::-webkit-scrollbar {
            width: 6px;
            height: 10px;

            &-button {
              width: 0px;
              height: 0px;
            }

            &-thumb {
              background: rgba(0,0,0,.4);
              border: 0px none #ffffff;
              border-radius: 3px;

              &:hover {
                background: #000;
              }

              &:active {
                background: #000;
              }
            }

            &-track {
              background: rgba(0,0,0,.1);
              border: 0px none #ffffff;
              border-radius: 0;

              &:hover {
                background: rgba(0,0,0,.1);
              }

              &:active {
                background: rgba(0,0,0,.1);
              }
            }

            &-corner {
              background: transparent;
            }
          }
          
          li {
            display: flex;
            flex-direction: row;
            align-items: center;
            
            .number {
              display: inline-block;
              padding: 0 0 0 80px;
              overflow: hidden;
              
              span {
                display: block;
                font-size: 48px;
                font-weight: 400;
                transition: transform .25s ease;
                transform: translateY(100%);
              }
            }
            
            a {
              display: inline-block;
              font-size: 48px;
              color: #000;
              line-height: 1;
              padding: 24px 0 24px 80px;
              transition: transform .25s ease;
            }
            
            &:hover {
              a {
                transform: translateX(20px);
              }
            }
            
            &.hover {
              .number {
                span {
                  transform: translateY(0);
                }
              }
            }
          }
        }
      }
      
      &.hidden {
        display: none;
      }
      
      &.open {
        opacity: 1;
        
        .showcase {
          animation: slideInLeft .5s cubic-bezier(.3, 0, .3, 1) forwards;
        }
        
        .menu {
          animation: slideInRight .5s cubic-bezier(.3, 0, .3, 1) forwards;
        }
      }
    }
  }
}


@keyframes slideInRight {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(0);
  }
}

.content {
  position: relative;
  flex: 1;
  padding: 80px 40px 40px;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/124740/2018-09-28%2009_21_48-https___d2kbkpwf98wmwo.cloudfront.net_videos_hero-lg.mp4.png);
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  
  p {
    color: #fff;
    opacity: 0;
    transition: opacity .5s cubic-bezier(.25,.46,.45,.94);
    
    a {
      color: #fff;
      box-shadow: 0 1px 0 0 $main;
    }
  }
}

View Compiled

$(document).ready(function() {
  navNumbers();
  backToDefault();
  
  // show hovered li stuff
  $('.main-menu').on('mouseover', 'li', function() {
    showTarget($(this));
  });

  // show default .active li stuff
  $('.main-menu').on('mouseleave', backToDefault);
  
  // change active list item
  $('.main-menu').on('click', 'li', function() {
    changeActive($(this));
  });
  
  // toggle menu
  $('.toggle').on('click', toggleMenu);
  
  // for showcase only
  var tl = new TimelineMax(),
      body = $('body'),
      header = $('header'),
      content = $('.content p'),
      toggle = $('.toggle'),
      nav = $('nav');
  
  tl.to(body, 1, {
    padding: '0 80px 80px',
    delay: .5
  });
  
  tl.to(header, .25, {
    opacity: 1,
    delay: .5
  });
  
  tl.to(content, .25, {
    opacity: 1
  }, '-=.25');
  
  tl.call(function() {
    toggleMenu();
  }, null, null, 3);
  
  tl.call(function() {
    toggleMenu();
  }, null, null, 4.5);

});

// toggle menu
function toggleMenu() {
  var toggle = $('.toggle');
  var nav = $('nav');
  
  if(toggle.hasClass('clicked')) {
    toggle.removeClass('clicked');
    nav.removeClass('open');
    console.log('remove open');
    setTimeout(function() {
      console.log('add hidden');
      nav.addClass('hidden');
    }, 500);
  } else {
    nav.removeClass('hidden');
    toggle.addClass('clicked');
    nav.addClass('open');
  }
}

// give the list items numbers
function navNumbers() {
  var sum = $('.main-menu li').length;
  var i = 0;
  var x = 0;

  $('.showcase-menu li').each(function() {
    $(this).attr('data-target', x);
    x++;
  });
  
  $('.main-menu li').each(function() {
    var number = ('0' + i).slice(-2);
    var numberElement = '<div class="number"><span>'+number+'</span></div>';
    $(this).prepend(numberElement);
    $(this).attr('data-target', i);
    i++;
  });
}


// show the hovered list item stuff
function showTarget(e) {
  $('.main-menu li').removeClass('hover');
  
  var target = $(e).attr('data-target');
  var showcaseHeight = $('.showcase-menu').outerHeight();
  
  showcaseHeight = (showcaseHeight * target) * -1;
  
  $('.showcase-menu').css({
    top: showcaseHeight
  });
  
  $(e).addClass('hover');
}

// show the list item stuff of .active
function backToDefault() {
  $('.main-menu li').removeClass('hover');
  
  var activeItem = $('.main-menu li.active');
  var target = activeItem.attr('data-target');
  var showcaseHeight = $('.showcase-menu').outerHeight();
  
  showcaseHeight = (showcaseHeight * target) * -1;
  
  $('.showcase-menu').css({
    top: showcaseHeight
  });
  
  activeItem.addClass('hover');
}


// change active list item
function changeActive(e) {
  $('.main-menu li').removeClass('active');
  $(e).addClass('active');
}

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