.error {
  color: red;
}
.input {
  position: relative;
  z-index: 1;
  display: inline-block;
  margin: 80px 0 0 100px;
}

.input__field {
  position: relative;
  display: block;
  padding: 0.8em;
  border: none !important;
  border-radius: 0;
  background: #f0f0f0;
  color: #aaa;
  font-size: 18px;
  -webkit-appearance: none; /* for box shadows to show on iOS */
}

.input__field:focus {
  outline: none;
}

.input__label {
  display: inline-block;
  width: 40%;
  color: #6a7989;
  font-weight: bold;
  font-size: 70.25%;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.input__label-content {
  position: relative;
  display: block;
  padding: 1.6em 0;
  width: 100%;
  font-family: 'Open Sans', sans-serif;
}

/* Hoshi */
.input--hoshi {
overflow: hidden;
}

.input__field--hoshi {
  margin-top: 0.85em;
  padding: 0.85em 0.15em;
  width: 100%;
  background: transparent;
  color: #595F6E;
}

.input__label--hoshi {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: left;
  pointer-events: none;
}

.input__label-content--hoshi {
  position: absolute;
}

.input__label--hoshi::before,
.input__label--hoshi::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: calc(100% - 10px);
  border-bottom: 1px solid #B9C1CA;
}

.input__label--hoshi::after {
  border-bottom: 4px solid red;
  -webkit-transform: translate3d(-100%, 0, 0);
  transform: translate3d(-100%, 0, 0);
  -webkit-transition: -webkit-transform 0.3s;
  transition: transform 0.3s;
}

.input__label--hoshi-color-1::after {
  border-color: hsl(200, 100%, 50%);
}

.input__field--hoshi:focus + .input__label--hoshi::after,
.input--filled + .input__label--hoshi::after {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

.input__field--hoshi:focus + .input__label--hoshi .input__label-content--hoshi,
.input--filled + .input__label--hoshi .input__label-content--hoshi {
  -webkit-animation: anim-1 0.3s forwards;
  animation: anim-1 0.3s forwards;
}

@-webkit-keyframes anim-1 {
  50% {
    opacity: 0;
    -webkit-transform: translate3d(1em, 0, 0);
    transform: translate3d(1em, 0, 0);
  }
  51% {
    opacity: 0;
    -webkit-transform: translate3d(-1em, -40%, 0);
    transform: translate3d(-1em, -40%, 0);
  }
  100% {
    opacity: 1;
    -webkit-transform: translate3d(0, -40%, 0);
    transform: translate3d(0, -40%, 0);
  }
}

$(document).ready(function(){
  $('#form').validate({
        onkeyup: false,
        rules: {
            field1: {
                required: true,
                minlength: 5
            }
        },
        errorLabelContainer: '.error',
        submitHandler: function(form) {
            alert('valid form');
            return false;
        }
    });
  
  $('.input__field').change(function() {
    var $this = $(this);
    var $thisInput = $this.find('input');        
    if ($this.val() !== "") {
      $this.addClass('input--filled');
    } else {
      $this.removeClass('input--filled');      
    }
  });
  
  $('.input__field').blur(function(){
    
});
  
});