.left-menu
  .logo
    i.fa.fa-align-justify
    div Pure CSS Accordion Nav
  .accordion
    .section
      input(type='radio' name='accordion-1' id='section-1' checked)
      label(for='section-1')
        span Messages
      .content
        ul
          li
            i.fa.fa-inbox
            span Inbox
          li
            i.fa.fa-share
            span Sent    
          li
            i.fa.fa-archive
            span Archive
    .section
      input(type='radio' name='accordion-1' id='section-2' value='toggle')
      label(for='section-2') 
        span Usage
      .content
        ul
          li
            i.fa.fa-cog
            span System
          li
            i.fa.fa-group
            span Users    
          li
            i.fa.fa-sitemap
            span Visitation
    .section
      input(type='radio' name='accordion-1' id='section-3' value='toggle')
      label(for='section-3') 
        span Scroller
      .content
        ul
          li
            i.fa.fa-coffee
            span Need Coffee
          li
            i.fa.fa-coffee
            span Need Coffee    
          li
            i.fa.fa-coffee
            span Need Coffee
          li
            i.fa.fa-coffee
            span Need Coffee
          li
            i.fa.fa-coffee
            span Need Coffee    
          li
            i.fa.fa-coffee
            span Need Coffee
          li
            i.fa.fa-coffee
            span Need Coffee
          li
            i.fa.fa-coffee
            span Need Coffee    
          li
            i.fa.fa-coffee
            span Need Coffee
    .section
      input(type='radio' name='accordion-1' id='section-4' value='toggle')
      label(for='section-4') 
        span Section 4
      .content

@import "compass/css3";

@mixin transition($trans...) {
  -webkit-transition: $trans;
  -moz-transition: $trans;
  -ms-transition: $trans;
  transition: $trans;
}

@mixin noselect() {
  -webkit-user-select: none;
  -moz-user-select: none;     
  -ms-user-select: none; 
  -o-user-select: none;
  user-select: none;   
}

$toggle-background: #222;
$toggle-background-active: lighten($toggle-background, 8);
.accordion {
  color: #FFF; 
  width: 100%;
  .section {
    width: 100%;
    input[type='radio'] {
      display: none;
      &:checked {
        & + label {
          background: $toggle-background-active;
          &:before {
            content: " ";
            position: absolute;
            border-left: 3px solid #21CCFC; 
            height: 100%;
            left: 0;
          }
        }
        & ~ .content {
          max-height: 300px; 
          opacity: 1;
          z-index: 10;
          overflow-y: auto; 
        }
      }
    }
    label {
      position: relative;
      cursor: pointer;
      padding: 10px 20px; 
      display: table;
      background: $toggle-background;
      width: 100%;
      @include transition (background 0.3s ease-in-out);
      @include noselect();
      &:before {
        content: " ";
        width: 100%;
        position: absolute;
        left: 0;
        top: 0;
        height: 1px;
        border-top: 1px solid $toggle-background-active;  
      }
      &:hover {
        background: $toggle-background-active;  
      }
      span {
        display: table-cell;
        vertical-align: middle;
      }
    }
    &:last-of-type {
      border-bottom: 1px solid $toggle-background-active;  
    }
    .content {
      max-height: 0;
      @include transition(all 0.4s);
      opacity: 0;
      position: relative;
      overflow-y: hidden; 
    }  
  }    
}

// Custom styles
*, *:before, *:after {
  -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;
 }

@import url(https://fonts.googleapis.com/css?family=Quicksand:300,400,700);
@import url(https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.0.3/css/font-awesome.min.css);
body {
  background: #666;
  font-family: 'Quicksand', sans-serif;
}
.left-menu {
  background: #222;
  width: 200px;
  position: absolute;
  top: 0;
  bottom: 0;
}
.accordion {
  font-size: 14px;
  .section {
    .content {
      padding: 0 15px;
    }
    input[type='radio'] {
      display: none;
      &:checked {
        & ~ .content {
          padding: 15px;    
        }
      }
    }
  }
}
ul {
  width: 100%;
  padding: 0;
  margin: 0;
  list-style: none; 
  li {
    padding: 10px; 
    i {
      font-size: 13px;
      width: 15px;
      margin-right: 15px;
    }
    &:hover {
      cursor: pointer;
      i {
        color: #21CCFC;  
      }
    }
  }
}
.logo {
  padding: 30px 10px;
  width: 200px;
  text-align: center;
  color: #FFF;
  font-size: 20px;
  i {
    font-size: 70px;
    color: #21CCFC;
  }
}

// Magic