<nav class="menu-wrapper">
  <button class="menu-btn" has-ripple="true">
    <i></i>
    <i></i>
    <i></i>
    <span class="ripple"></span>
  </button>
  <ul class="menu">
    <li class="menuitem-wrapper">
      <div class="icon-holder">
        <a href="#" class="menu-item">
            <i class="material-icons">home</i>
        </a>
      </div>
      <svg class="circle-holder">
        <circle r="88" cx="50%" cy="50%" fill="none">
        </circle>
      </svg>
    </li>
    <li class="menuitem-wrapper">
      <div class="icon-holder">
        <a href="#" class="menu-item">
            <i class="material-icons">face</i>
        </a>
      </div>
      <svg class="circle-holder">
        <circle r="88" cx="50%" cy="50%" fill="none">
        </circle>
      </svg>
    </li>
    <li class="menuitem-wrapper">
      <div class="icon-holder">
        <a href="#" class="menu-item">
            <i class="material-icons">android</i>
        </a>
      </div>
      <svg class="circle-holder">
        <circle r="88" cx="50%" cy="50%" fill="none">
        </circle>
      </svg>
    </li>
    <li class="menuitem-wrapper">
      <div class="icon-holder">
        <a href="#" class="menu-item">
            <i class="material-icons">shopping_cart</i>
        </a>
      </div>
      <svg class="circle-holder">
        <circle r="88" cx="50%" cy="50%" fill="none">
        </circle>
      </svg>
    </li>
    <li class="menuitem-wrapper">
      <div class="icon-holder">
        <a href="#" class="menu-item">
            <i class="material-icons">room</i>
        </a>
      </div>
      <svg class="circle-holder">
        <circle r="88" cx="50%" cy="50%" fill="none">
        </circle>
      </svg>
    </li>
  </ul>
</nav>

$spin-speed: 0.7s;
$color-collection: ('#2980b9', '#c0392b', '#1abc9c', '#f39c12', '#8e44ad');
$degFactor: 71.5;

html {
  font-size: 16px;
}

body {
  background: #2c3e50;
  box-sizing: border-box;
  transition: all 0.25s ease-in;
}
*, *:before, *:after {
  box-sizing: inherit;
}
a {color: white;text-decoration: none;}

.menu-wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 30rem;
  height: 30rem;
  margin-top: -15rem;
  margin-left: -15rem;
}

.menu {
  width: 100%;
  height: 100%;
  transform: scale(0);
  transform-origin: center;
  transition: all 0.08s ease-in-out;
  
  li {
    position: absolute;
    top: 50%;
    left: 50%;
    display: inline-block;
    width: 4rem;
    height: 80%;
    margin-top: -12rem;
    margin-left: -2rem;
    text-align: center;
    
    &.spin {
      z-index: 5;
      .icon-holder {animation: spin $spin-speed linear forwards;}
      .circle-holder {
        display: block;
        circle {animation: dash $spin-speed linear forwards;}
      }
    }
  }
  
  a {
    position: relative;
    display: inline-block;
    width: 4rem;
    height: 4rem;
    margin-top: 4.5rem;
    padding: 1rem;
    border-radius: 100%;
    transform: scale(1,1);
    
    i {
      display: inline-block;
      vertical-align: middle;
      line-height: 1.2;
    }
  }
  
  &.open {
    transform: scale(1);
    // animation: bouncein linear 0.1s forwards 1;
  }
}

.icon-holder {
  position: relative;
  z-index: 1;
  display: inline-block;
  width: 4rem;
  height: 100%;
}

.circle-holder {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 0;
  display: none;
  width: 24rem;
  height: 24rem;
  margin: -12rem;
  padding: 1rem;
  transform: rotate(-90deg);
  
  circle {
    width: 100%;
    height: 100%;
    stroke-width: 4rem;
    stroke-dasharray: 560;
    stroke-dashoffset: 560;
    stroke-linecap: round;
  }
}

.menu-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 10;
  display: block;
  width: 4rem;
  height: 4rem;
  margin: -2rem;
  padding: 1.3rem;
  background: white;
  border: none;
  box-shadow: none;
  border-radius: 100%;
  text-align: center;
  line-height: 1;
  appearance: none;
  outline: none;
  cursor: pointer;
  font-size: 0;
  
  i {
    position: relative;
    z-index: 11;
    display: inline-block;
    vertical-align: middle;
    width: 100%;
    height: 0.1rem;
    margin: 0 auto;
    background: #2c3e50;
  }
  i:nth-child(2) {
    margin: 0.34rem auto;
  }
}

.clicked {
  &.menu-btn {
    animation: buttonactive ease-in 0.2s forwards 1;

    i:first-child {
      animation: top-down ease-in 0.2s forwards 1;
    }
    i:nth-child(2) {
      animation: middle ease-in 0.01s forwards 1;
    }
    i:nth-child(3) {
      animation: down-top ease-in 0.2s forwards 1;
    }
  }
  
  .ripple {
    animation: ripples ease-in 0.35s forwards 1;
  }
}

.ripple {
  position: absolute;
  top: -1rem;
  left: -1rem;
  z-index: 10;
  display: block;
  width: 6rem;
  height: 6rem;
  transform: scale(0.5);
  opacity: 0;
  border: 2rem solid white;
  border-radius: 100%;
}

@for $i from 0 to length($color-collection) {
  .menu li:nth-child(#{$i+1}) {
    transform: rotate(#{$i*$degFactor}deg);
    
    a {
      transform: rotate(-#{$i*$degFactor}deg);
      background: unquote(nth($color-collection, $i+1));
    }
    circle {stroke: unquote(nth($color-collection, $i+1));}
  }
  
  .bg-#{$i} {background: unquote(nth($color-collection, $i+1));}
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
    opacity: 1;
  }
  80% {
    transform: rotate(360deg);
    opacity: 1;
  }
  100% {
    transform: rotate(360deg);
    opacity: 0;
  }
}

@keyframes dash {
  0% {
    stroke-dashoffset: 560;
    stroke-width: 4rem;
  }
  80% {
    stroke-dashoffset: 0;
    stroke-width: 4rem;
    opacity: 1;
  }
  100% {
    stroke-dashoffset: 0;
    stroke-width: 6rem;
    opacity: 0;
  }
}

@keyframes buttonactive {
  0% {
    background: white;
    transform: rotate(0deg);
  }
  100% {
    background: lighten(#34495e, 15%);
    transform: rotate(-90deg);
  }
}

@keyframes middle {
  0% {
    opacity: 1;
    left: 0;
  }
  100% {
    opacity: 0;
    left: -4rem;
  }
}

@keyframes top-down {
  0% {
    top: 0;
    transform: rotate(0);
  }
  100% {
    top: 0.35rem;
    transform: rotate(-45deg);
  }
}

@keyframes down-top {
  0% {
    top: 0;
    transform: rotate(0);
  }
  100% {
    top: -0.4rem;
    transform: rotate(45deg);
  }
}

@keyframes ripples {
  0%   {
    opacity: 1.0;
    transform: scale(0.5);
    border-width: 3rem;
  }
  100% {
    opacity: 0.5;
    transform: scale(1);
    border-width: 0rem;
  }
}

@keyframes bouncein {
  to {
    transform: scale(1);
  }
}

$('[has-ripple="true"]').click(function () {
  $(this).toggleClass('clicked');
  $('.menu').toggleClass('open');
});

$('.menu a').each(function (index) {
  var thismenuItem        = $(this);
  
  thismenuItem.click(function (event) {
    event.preventDefault();
    
    $('.menuitem-wrapper').eq(index).addClass('spin');
    
    var timer = setTimeout(function () {
      $('body').removeAttr('class').addClass('bg-'+index);
      $('.menuitem-wrapper').eq(index).removeClass('spin');
      $('.menu').removeClass('open');
      $('.menu-btn').removeClass('clicked');
    }, 800);
  });
});