@import url(https://fonts.googleapis.com/css?family=Roboto:300);
$indigo: #536dc8;
$danube: #6191d1;
$white: #fff;
$bermuda: #77D7B9;
* {
  box-sizing: border-box;
}

@mixin center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

body {
  background-image: linear-gradient(to left, $danube, $indigo);
  height: 100vh;
  font-smoothing: antialiased;
}

@keyframes roll {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  50% {
    transform: translate(-80px, -50%) rotate(-10deg);
  }
  100% {
    transform: translate(130px, -50%) rotate(360deg);
  }
}

@keyframes roll-back {
  0% {
    transform: translate(130px, -50%) rotate(360deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
}

@keyframes expand {
  0% {
    width: 60px;
    height: 60px;
    opacity: 0;
  }
  50% {
    opacity: 1;
    width: 80px;
    height: 80px;
  }
  100% {
    width: 400px;
    height: 80px;
    opacity: 1;
  }
}

@keyframes collapse {
  0% {
    width: 400px;
    height: 80px;
    opacity: 1;
  }
  50% {
    opacity: 1;
    width: 80px;
    height: 80px;
  }
  100% {
    width: 60px;
    height: 60px;
    opacity: 0;
  }
}

.search-form {
  @include center;
  width: 400px;
  height: 80px;
  text-align: center;
  backface-visibility: hidden;
  .search-input {
    border: 0;
    padding: 0 20px;
    width: 0;
    height: 0;
    border-radius: 50px;
    background-color: $danube;
    font-size: 1.6em;
    color: $white;
    font-family: 'Roboto', sans-serif;
    .animate & {
      animation: collapse 0.3s 0.4s both ease-in;
    }
    .focus & {
      animation: expand 0.3s both ease-in;
    }
    &::-webkit-input-placeholder {
      color: $white;
    }
    &:-moz-placeholder {
      /* Firefox 18- */
      color: $white;
    }
    &::-moz-placeholder {
      /* Firefox 19+ */
      color: $white;
    }
    &:-ms-input-placeholder {
      color: $white;
    }
    &:focus {
      outline: none;
    }
  }
  .search-button {
    @include center;
    width: 60px;
    height: 60px;
    background-color: $bermuda;
    border: 0;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    backface-visibility: hidden;
    .animate & {
      animation: roll-back 0.2s both ease-in;
    }
    .focus & {
      animation: roll 0.4s 0.9s both ease-in;
    }
    &:focus {
      outline: none;
    }
    span {
      width: 25px;
      height: 25px;
      border-radius: 50%;
      border: 4px solid $white;
      display: block;
      position: absolute;
      top: 13px;
      left: 14px;
      &:after {
        content: '';
        width: 4px;
        height: 15px;
        background-color: $white;
        position: absolute;
        transform: rotate(-45deg);
        top: 12px;
        left: 18px;
      }
    }
  }
}

$('.search-button').on('click', function(e) {
  e.preventDefault();

  $('body').addClass('animate').toggleClass('focus');
});