3D Rotating Navigation

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A 3D rotating navigation, powered by CSS transformations.
Sometimes you just want your website navigation to be bold. Design agencies, for example, use their portfolio to show off their skills and push a little usability standards. Another good example is mobile apps: animated elements are key ingredients of the user experience. In this case a 3D menu can’t just be fun. It has to be efficient.
1. HTML
We created a <header> element to wrap the logo and the trigger for the rotating navigation (.cd-3d-nav-trigger) and a <main> element to wrap the main content. We used an unordered list for the navigation, semantically wrapped into a <nav> element. As pan.cd-marker has been appended to the <nav> to create the marker for the selected item in the navigation.

<header class="cd-header">
 <a href="#0" class="cd-logo"><img src="img/cd-logo.svg" alt="Logo"></a>
 <a href="#0" class="cd-3d-nav-trigger">Menu<span></span></a>
</header> 
 
<main>
 <!-- all your content here -->
</main>
 
<nav class="cd-3d-nav-container">
 <ul class="cd-3d-nav">
  <li class="cd-selected">
   <a href="#0">Dashboard</a>
  </li>
 
  <!-- other list items here -->
 </ul>
 
 <span class="cd-marker color-1"></span> <!-- marker for the selected navigation item -->
</nav>

2. CSS
To realise our animation, we used CSS3 Transformations applied to the <header>,<main> and <navigation> elements.
Here is a quick preview to show you the animation process (.gif created in After Effects).

By default, the navigation (.cd-3d-nav-container) is hidden right above the viewport (translateY(-100%) and visibility(hidden)), while the unordered list (.cd-3d-nav) is rotated (rotateX(90deg) and transform-origin: bottom center). When user clicks the trigger element, the class .nav-is-visible is added to the <main>, <header> and <nav> elements which are translated of a quantity equal to the navigation height while the .cd-3d-nav is rotated back (rotateX(0)). CSS3 Transitions have been used to achieve a smooth animation.

.cd-header {
  transition: transform 0.5s;
}
.cd-header.nav-is-visible {
  transform: translateY(80px);
}
 
.cd-3d-nav-container {
  /* this is the 3D navigation container */
  position: fixed;
  top: 0;
  left: 0;
  visibility: hidden;
  /* enable a 3D-space for children elements */
  perspective: 1000px;
  transform: translateY(-100%);
  transition: transform 0.5s 0s, visibility 0s 0.5s; 
}
.cd-3d-nav-container.nav-is-visible {
  visibility: visible;
  transform: translateY(0);
  transition: transform 0.5s 0s, visibility 0.5s 0s; 
}
.cd-3d-nav {
  /* this is the 3D rotating navigation */
  transform-origin: center bottom;
  transform: rotateX(90deg);
  transition: transform 0.5s; 
}
main {
  transition: transform 0.5s;
}
main.nav-is-visible {
  transform: translateY(80px); 
}

The .cd-marker element has been used to create the marker for the selected navigation item (the <span> is the bottom line, while its ::before pseudo-element is the triangle). In order to change the marker color, we defined the .color-n classes (one for each navigation item). These classes change the color property of the .cd-marker. Since we set background-color : currentColor, changing the color updates the background-color too. Beside, we set border-bottom-color: inherit for the .cd-marker::before element, which is also updated changing its parent color property.

.cd-marker {
  background-color: currentColor;
}
.cd-marker::before {
    /* triangle at the bottom of nav selected item */
    height: 0;
    width: 0;
    border: 10px solid transparent;
    border-bottom-color: inherit; 
}
 
/* these are the colors of the markers - line + arrow */
.color-1 {
  color: #9a57bd; 
}
 
.color-2 {
  color: #c96aa4; 
}
 
/* other classes here */

3. EVENTS HANDLING
We used jQuery to add/remove the .nav-is-visible class when user clicks the navigation trigger.

Besides, when user selects one of the navigation list item, the left position of the span.cd-marker is changed so that it is aligned with the selected element, and the proper .color-n class is added (to change its background color).