// Variables
$baseMenuBackground: transparent;          // Base color theme
$secondaryMenuBackground: #0186ba;  // Secondary color (highlights, triangles...)
$gutter: 10px;                      // Base gutter

// Latest CSS box model 
*, *:after, *:before {
  box-sizing: border-box; 
}

// The classic hamburger icon
// <button class="animenu__toggle">
//   <span class="animenu__toggle__bar"></span>
//   <span class="animenu__toggle__bar"></span>
//   <span class="animenu__toggle__bar"></span>
// </button>
.animenu__toggle {
  display: none;
  cursor: pointer;
  background-color: $baseMenuBackground;
  border: 0; 
  padding: 10px;
  height: 40px;
  width: 40px;

  &:hover {
    background-color: $secondaryMenuBackground;
  }
}

.animenu__toggle__bar {
  display: block;
  width: 20px; height: 2px;
  background-color: #fff;    
  transition: .15s cubic-bezier(0.75, -0.55, 0.25, 1.55);

  &+.animenu__toggle__bar {
    margin-top: 4px;
  }  
}

.animenu__toggle--active {
  .animenu__toggle__bar {
    margin: 0;
    position: absolute;

    &:nth-child(1) {
      transform: rotate(45deg);
    }

    &:nth-child(2) {
      opacity: 0;
    }

    &:nth-child(3) {
      transform: rotate(-45deg);
    }        
  }
}

// Clear some defaults
.animenu {
  display: block;
  ul {
    padding: 0;
    list-style: none;    
    font: 0px 'Open Sans', Arial, Helvetica;    
  }

  li, a {
    display: inline-block;
    font-size: 15px;
  }

  a {
    color: lighten($baseMenuBackground, 60%);
    text-decoration: none;
  }
}

// First level -> main menu items
// <nav class="animenu">
//    <ul class="animenu__nav">
//    ...
//    </ul>
//  </nav>
.animenu__nav {
  background-color: $baseMenuBackground;        

  > li {
    position: relative;
    border-right: 1px solid lighten($baseMenuBackground, 20%);

    > a {
      padding: $gutter 3 * $gutter;
      text-transform: uppercase;

      // http://bit.ly/SkmL1T & currentColor keyword
      &:first-child:nth-last-child(2):before { 
        content:""; 
        position: absolute;
        border: 4px solid transparent;
        border-bottom: 0; 
        border-top-color: currentColor;
        top: 50%;
        margin-top: -2px;
        right: 10px;  
      }  
    }    

    &:hover {
      > ul {
        opacity: 1;
        visibility: visible;
        margin: 0;        
      }

      > a {
        color: #fff;
      }
    }
  }
}

// Second level
// <nav class="animenu">
//    <ul class="animenu__nav">
//      <li>
//        <ul class="animenu__nav__child"></ul>
//      </li>
//    </ul>
//  </nav>
.animenu__nav__child {
  min-width: 100%;
  position: absolute;
  top: 100%; left: 0;
  z-index: 1;   
  opacity: 0;
  visibility: hidden;
  margin: 2 * $gutter 0 0 0;
  background-color: lighten($baseMenuBackground, 15%);    
  transition: margin .15s, opacity .15s;

  > li {
    width: 100%;
    border-bottom: 1px solid lighten($baseMenuBackground, 25%);

    &:first-child > a:after {
      content: '';
      position: absolute;
      height: 0; width: 0;
      left: 1em;
      top: -6px;
      border: 6px solid transparent;
      border-top: 0;
      border-bottom-color: inherit;
    }

    &:last-child {
      border: 0;
    }
  }

  a {
    padding: $gutter;
    width: 100%;
    border-color: lighten($baseMenuBackground, 15%);

    &:hover {
      background-color: $secondaryMenuBackground;
      border-color: $secondaryMenuBackground;
      color: #fff;
    }
  }
}

// The main breakpoint is 767px
// Adjust the first and second levels display
@media screen and (max-width: 767px) {
  .animenu__toggle {
    display: inline-block;
  }

  .animenu__nav,
  .animenu__nav__child {
    display: none;
  }

  // First level -> main menu items
  // <nav class="animenu">
  //    <ul class="animenu__nav">
  //    ...
  //    </ul>
  //  </nav>    
  .animenu__nav {
    margin: $gutter 0;

    > li {
      width: 100%;
      border-right: 0;
      border-bottom: 1px solid lighten($baseMenuBackground, 25%);

      &:last-child {
        border: 0; 
      }

      &:first-child > a:after {
        content: '';
        position: absolute;
        height: 0; width: 0;
        left: 1em;
        top: -6px;
        border: 6px solid transparent;
        border-top: 0;
        border-bottom-color: inherit;
      }

      > a {
        width: 100%;
        padding: $gutter;
        border-color: $baseMenuBackground;
        position: relative; //dropdown caret
      }
    }

    a:hover {
      background-color: $secondaryMenuBackground;
      border-color: $secondaryMenuBackground;
      color: #fff;      
    }
  }

  // Second level
  // <nav class="animenu">
  //    <ul class="animenu__nav">
  //      <li>
  //        <ul class="animenu__nav__child"></ul>
  //      </li>
  //    </ul>
  //  </nav>              
  .animenu__nav__child {
    position: static;
    background-color: lighten($baseMenuBackground, 15%);
    margin: 0;
    transition: none;
    visibility: visible;
    opacity: 1;     

    > li:first-child > a:after {
      content: none;
    }

    a {
      padding-left: 2 * $gutter;
      width: 100%;
    }           
  }
}

// Expanding the animenu
// <nav class="animenu">
//    <ul class="animenu__nav animenu__nav--open">
//      <li>
//        <ul class="animenu__nav__child"></ul>
//      </li>
//    </ul>
//  </nav>
.animenu__nav--open {
  display: block !important;

  & .animenu__nav__child {
    display: block;
  }
}