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               <main>
        <form class="form">
            <div class="form__cover"></div>
            <div class="form__loader">
                <div class="spinner active">
                    <svg class="spinner__circular" viewBox="25 25 50 50">
                        <circle class="spinner__path" cx="50" cy="50" r="20" fill="none" stroke-width="4" stroke-miterlimit="10"></circle>
                    </svg>
                </div>
            </div>
            <div class="form__content">
                <h1>Authorization</h1>
                <div class="styled-input">
                    <input type="text" class="styled-input__input" name="nickname">
                    <div class="styled-input__placeholder">
                        <span class="styled-input__placeholder-text">Username</span>
                    </div>
                    <div class="styled-input__circle"></div>
                </div><div class="styled-input">
                     <input type="text" class="styled-input__input">
                    <div class="styled-input__placeholder">
                        <span class="styled-input__placeholder-text">Password</span>
                    </div>
                    <div class="styled-input__circle"></div>
                </div>
                <button type="button" class="styled-button">
                    <span class="styled-button__real-text-holder">
                        <span class="styled-button__real-text">Submit</span>
                        <span class="styled-button__moving-block face">
                            <span class="styled-button__text-holder">
                                <span class="styled-button__text">Submit</span>
                            </span>
                        </span><span class="styled-button__moving-block back">
                            <span class="styled-button__text-holder">
                                <span class="styled-button__text">Submit</span>
                            </span>
                        </span>
                    </span>
                </button>
            </div>

        </form>
    </main>
            
          
!
            
              @import url('https://fonts.googleapis.com/css?family=Roboto');

body{
  all: initial;
  font-family: 'Roboto', sans-serif;
  letter-spacing: 0.02em;
}

*{
  box-sizing: border-box;
}

@c-purple: #8338bf;

main{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #3f2766;
}

.form{
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 400px;
  height: 400px;
	flex-shrink: 0;
  padding: 20px;
  border-radius: 5px;
  &__loader{
    display: flex;
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    justify-content: center;
    align-items: center;
    z-index: -4;
    transition: all 0.5s ease;
  }
  &__content{
    text-align: center;
    display: flex;
    justify-content: center;
    flex-direction: column;
    position: relative;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.5s ease 0.7s;
  }
  &__cover{
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    z-index: -4;
    border-radius: 7px;
    overflow: hidden;
    transition: all 0.3s ease 0.8s;
    box-shadow: 0 0 0 0 rgba(0,0,0,0);
    &:after{
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 100%;
      background: #4d317a;
      z-index: -4;
      border-radius: 50%;
      transition: all 1.5s ease 0.3s;
      transform: scale(0);
    }
    &:before{
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      height: 100%;
      width: 100%;
      background: white;
      z-index: -5;
      border-radius: 50%;
      transition: all 0.5s ease;
      transform: scale(0);
    }
  }
}

body.on-start{
  .form{
    &__cover{
      &:after{

      }
      &:before{
        transform: scale(0.15);
      }
    }
  }
}

body.document-loaded{
  .form{
    &__loader{
      transform: scale(0);
      opacity: 0;
      visibility: hidden;
    }
    &__content{
      opacity: 1;
      transform: none;
    }
    &__cover{
      box-shadow: 0 20px 50px rgba(0,0,0,0.3);
      &:after{
        transform: scale(2);
      }
      &:before{
        transition: transform 2s ease, opacity 0.3s ease 0.8s;
        transform: scale(2);
        opacity:0;
      }
    }
  }
}

h1{
  font-size: 40px;
	margin: 15px 0 20px 0;
  letter-spacing: 0.05em;
  color: #714cab;
	font-weight: 700;
}

.styled-button{
  -webkit-appearance: none;
  -webkit-user-select: none;
  cursor: pointer;
  font-size: 14px;
  width: 100%;
  padding: 20px;
  outline: none;
  background: none;
  position: relative;
  color: #492e72;
  border-radius: 3px;
  margin-bottom: 25px;
  border: none;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: #714cac;
  transition: all 0.3s ease;
  overflow: hidden;
  &__real-text-holder{
    position: relative;
  }
  &__real-text{
    color: transparent;
    display: inline-block;
  }
  &__text-holder{
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
  }
  &__moving-block{
    transition: all 0.3s ease;
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
    &.face{

    }
    &.back{
      color: white;
      transform: translateX(-100%);
      .styled-button__text-holder{
        transform: translateX(100%);
      }
    }
  }
  &:hover, &:active{
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    background: #7a51bb;
    .face{
      transform: translateX(100%);
      .styled-button__text-holder{
        transform: translateX(-100%);
      }
    }
    .back{
      transform: translateX(0);
      .styled-button__text-holder{
        transform: translateX(0);
      }
    }
  }
  &:active{
    box-shadow: 0 0 5px rgba(0,0,0,0.3);
  }
}

.styled-input{
  width: 100%;
  position: relative;
  margin-bottom: 25px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 3px;
  transition: all 0.3s ease;
  &__circle{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
    border-radius: 3px;
    &:after{
      content: '';
      position: absolute;
      left: 16.5px;
      top: 19px;
      height: 14px;
      width: 14px;
      z-index: -2;
      border-radius: 50%;
      background: rgba(255,255,255,0.15);
      box-shadow: 0 0 10px rgba(255,255,255,0);
      transition: transform 0.6s ease, opacity 1s ease;
    }
  }
  &__input{
    width: 100%;
    -webkit-appearance: none;
    font-size: 14px;
    outline: none;
    background: none;
    padding: 18px 15px;
    color: #ceafff;
    border: none;
    font-weight: 600;
    letter-spacing: 0.035em;
  }
  &__placeholder{
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    z-index: -1;
    padding-left: 45px;
    color: white;
    &-text{
      perspective: 500px;
      display: inline-block;
      .letter{
        display: inline-block;
        vertical-align: middle;
        position: relative;
        animation: letterAnimOut 0.25s ease forwards;
        text-shadow: 0 0 5px;
        &.active{
          animation: letterAnimIn 0.25s ease forwards;
        }
      }
    }
  }
  &:hover{
    border-color: rgba(255,255,255,0.4);
  }
  &.filled{
    border-color: rgba(255,255,255,0.2);
    .styled-input__circle{
      &:after{
        transform: scale(37);
        opacity: 0;
      }
    }
  }
}

@keyframes letterAnimIn{
  0%{
    transform: translate(0, 0);
  }
  25%{
    transform: translate(0,10px);
    color: red;
  }
  45%{
    transform: translate(0,10px);
    opacity: 0;
    color: red;
  }
  55%{
    transform: translate(0,10px);
    opacity: 0;
  }
  56%{
    transform: translate(-30px,-27px);
    opacity: 0;
    color: #00ff6b;
  }
  76%{
    color: #00ff6b;
    opacity: 1;
    transform: translate(-30px, -27px);
  }
  100%{
    transform: translate(-30px, -27px);
    opacity: 1;
  }
}

@keyframes letterAnimOut{
  0%{
    transform: translate(-30px, -27px);
    opacity: 1;
  }
  25%{
    transform: translate(-30px,-40px);
    opacity: 0;
  }
  45%{
    transform: translate(0,10px);
    opacity: 0;
  }
  55%{
    transform: translate(0,10px);
    opacity: 0;
    color: red;
  }
  56%{
    transform: translate(0,10px);
    color: red;
  }
  100%{
    transform: translate(0, 0);
  }
}

.spinner{
  position: relative;
  margin: auto;
  width: 50px;
  height: 50px;
  transition: all 0.2s ease 0s;
  &__circular{
    animation: rotate 1.5s linear infinite;
    animation-play-state: paused;
    transform-origin: center center;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    margin: auto;
  }
  &__path{
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
    animation: dash 1.3s ease forwards 0.5s;
    opacity: 0;
    stroke-linecap: round;
    stroke: #7b23ff;
    animation-play-state: running;
  }
}

@keyframes dash {
  0% {
    stroke-dasharray: 1, 200;
    stroke-dashoffset: 0;
    opacity: 0;
  }
  50% {
    stroke-dasharray: 40, 200;
    opacity: 1;
  }
  100% {
    stroke-dasharray: 125, 200;
    opacity: 1;
  }
}
            
          
!
            
              const 
	placeholders = document.querySelectorAll('.styled-input__placeholder-text'),
  inputs = document.querySelectorAll('.styled-input__input');

placeholders.forEach(function(el, i){
    let value = el.innerText,
        html = '';
    for(let w of value){
        if(!value) value = '&nbsp;';
        html += `<span class="letter">${w}</span>`;
    }
    el.innerHTML = html;
});

inputs.forEach(function(el){
    let parent = el.parentNode;
    el.addEventListener('focus', function(){
        parent.classList.add('filled');
        placeholderAnimationIn(parent, true);
    }, false);
    el.addEventListener('blur', function(){
        if(el.value.length) return;
        parent.classList.remove('filled');
        placeholderAnimationIn(parent, false);
    }, false);
});

function placeholderAnimationIn(parent, action){
    let act = (action)? 'add' : 'remove';
    let letters = parent.querySelectorAll('.letter');
    letters = [].slice.call(letters, 0);
    if(!action) letters = letters.reverse();
    letters.forEach(function(el, i){
        setTimeout(function(){
            let contains = parent.classList.contains('filled');
            if( (action && !contains) || (!action && contains)) return;
            el.classList[act]('active');
        }, (50*i));
    });
}

setTimeout(function(){
    document.body.classList.add('on-start');
}, 100);

setTimeout(function(){
    document.body.classList.add('document-loaded');
}, 1800);


            
          
!
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