<div class="container">
  <input type="radio" class="is-hidden" id="component@profile-card-radio-1" name="profile-card-radio-group" />

  <section class="component@profile-card" id="component@profile-card-1">

    <header class="component@profile-card__header">
      
      <label for="component@profile-card-radio-1" class="component@profile-card__link object@sticker"><i class="object@sticker__item ion-ios-arrow-right"></i></label>
      <div class="object@sticker component@profile-card__link">
        <div class="object@sticker__item ion-ios-compose-outline"></div>
      </div>
      <div class="object@sticker component@profile-card__link">
        <div class="object@sticker__item ion-ios-trash-outline"></div>
      </div>
      
    </header>

    <article class="component@profile-card__body">

      <h2 class="component@profile-card__title">Messages</h2>

      <div class="object@media-object">
        
        <img src="https://picsum.photos/id/237/48/48" class="object@media-object__img" />
        
        <div class="object@media-object__body">
          <h4 class="object@media-object__heading">Jim Clark</h4>
          <h5 class="object@media-object__subheading">January 23rd, 2016</h5>
          <p class="object@media-object__text">Lorem ipsum dolor sit amet, diceret sensibus percipitur at duo, sit cu dolore scaevola efficiantur.</p>
        </div>
        
      </div>
      
      <div class="object@media-object">
        <img src="https://picsum.photos/id/237/48/48" class="object@media-object__img" />
        <div class="object@media-object__body">
          <h4 class="object@media-object__heading">Jim Clark</h4>
          <h5 class="object@media-object__subheading">January 23rd, 2016</h5>
          <p class="object@media-object__text">Lorem ipsum dolor sit amet, diceret sensibus percipitur at duo, sit cu dolore scaevola efficiantur.</p>
        </div>
      </div>
      
    </article>

    <div class="component@profile-card__blur"></div>
  </section>

  <input type="radio" class="is-hidden" id="component@profile-card-radio-2" name="profile-card-radio-group" checked />
  <section class="component@profile-card" id="component@profile-card-2">

    <header class="component@profile-card__header">
      <label for="component@profile-card-radio-2" class="component@profile-card__link object@sticker"><i class="object@sticker__item ion-ios-arrow-right"></i></label>
      <div class="object@sticker component@profile-card__link">
        <div class="object@sticker__item ion-ios-cart-outline"></div>
      </div>
      <div class="object@sticker component@profile-card__link">
        <div class="object@sticker__item ion-ios-pricetags-outline"></div>
      </div>
    </header>

    <article class="component@profile-card__body">
      <h2 class="component@profile-card__title">Checkout</h2>
      <p class="helper@margin-top--none">Complete checkout?</p>
    </article>

    <div class="component@profile-card__blur"></div>
  </section>
</div>

// Portfolio Profile Card
// Pen by Jay Kariesch

// Pen Thought: 
// - organize rules relationally and by separation of behaviors.
// - use BEM
// - "type" prefix class names (call a spade a spade) with ITCSS conventions
// - get more coffee :)

// fetch nested key/vals from our config
@function map-fetch($map, $keys...) {
    @each $key in $keys {
        $map: map-get($map, $key);
    }
    @return $map;
}

$shadow-spread: 66;
// our config. manages properties. 
// useful when converting to a mixin and otherwise.
$config: (
  bg-image: 'https://picsum.photos/seed/picsum/1200/1200/',
  z-index: (
    blur: 0,
    body: 1,
    header: 2,
    arrow: 2
  ),
  colors: (
    hero-bg: rgba(white, 0.7),
    body-bg: rgba(#f7f7f7, 0.6),
    arrow-bg: darken(white, 15%),
    text: #303030
  ),
  shadows: (
    card: 8px 10px #{$shadow-spread}px 1px rgba(0, 0, 0, 0.4)
  ),
  small-card: (
    left-distance: 50,
    min-scale: 1,
    min-opacity: 0.6,
    shadow: 2px 2px 2px 1px rgba(0, 0, 0, 0.4)
  )
);

// our sass
.component\@profile-card {
  
  display: flex;
  align-items: stretch;
  flex-direction: column;
  justify-content: space-between;
  
  box-shadow: map-fetch($config, shadows, card), -1px -1px 0px 1px white, -1px -1px 0px 1px white, inset 3px 0px 0px  white;
  
  position: relative;
  
  height: 400px;
  width: 100%;
  
  will-change: transform, top, left, opacity, position, box-shadow;
  z-index: 1;
  
  @media(min-width: 480px) {
    width: 460px;
  }
  
  &__blur {
    background: url(map-get($config, bg-image)) no-repeat center center fixed;
    background-size: cover;
    
    filter: blur(13px);
    
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    
    z-index: map-fetch($config, z-index, blur);
  }
  
  &__header {
    background: map-fetch($config, colors, hero-bg);
    
    width: 90px;
    
    position: absolute;
    
    left: 0;
    top: 0;
    bottom: 0;
    
    z-index: map-fetch($config, z-index, header);
  }
  
  &__body {
    background: map-fetch($config, colors, body-bg);
    
    display: flex;
    flex-grow: 1;
    flex-shrink: 0;
    flex-direction: column;
    
    padding: 0 24px 24px 114px;
    
    z-index: map-fetch($config, z-index, body);
  }
  
  &__title {
    letter-spacing: 2px;
    margin-bottom: 36px;
  }
  
  &__link {
    display: flex;
    align-items: center;
    justify-content: center;
    
    position: absolute;
    top: 0;
    left: 0;
    
    height: 60px;
    width: 100%;
    
    transition: ease 0.2s background;
    will-change: background;
    
    z-index: map-fetch($config, z-index, arrow);
    
    &:hover {
      background: darken(white, 18%);
    }
  }
  
  &__img {
    margin: 0 auto;
  }
}

.object\@sticker {
  position: relative;
  &__item {
    color: map-fetch($config, colors, text);
    font-size: 36px;
    
    display: flex;
    justify-content: center;
    
    background-clip: text;
  }
}

.object\@media-object {
  margin-top: 24px;
 
  display: flex;
  align-items: flex-start;
  
  &:first-of-type {
    margin-top: 0;
  }
  &__img {
    margin-right: 1em; 
  }
  &__body {
    flex: 1;
  }
  &__heading {
    margin: 0;
  }
  &__subheading {
    color: #666;
    font-size: 12px;
    text-transform: uppercase;
    
    margin-top: 0;
    margin-bottom: 6px;
  }
  &__text {
    margin: 0;
    font-weight: 200;
  }
}

.helper\@margin-top--none {
  margin-top: 0;
}

$triggers: (
  (#component\@profile-card-radio-2, #component\@profile-card-2, #component\@profile-card-1),
  (#component\@profile-card-radio-1, #component\@profile-card-1, #component\@profile-card-2)
);

@each $radio, $scard, $pcard in $triggers {
  
  #{$radio} {
    transition: ease all 1s;
    
    &:checked {
      ~ #{$scard} {
        
        position: absolute;

        left: #{map-fetch($config, small-card, left-distance)}px;
        top: 24px;

        opacity: map-fetch($config, small-card, min-opacity);
        
        transition: ease top 1s, ease opacity 1s;
        transition-delay: 2s;
        transform: scale(map-fetch($config, small-card, min-scale));
        backface-visibility: hidden;
        perspective: 1000;


        box-shadow: map-fetch($config, small-card, shadow);

        z-index: 0;

        animation: primary 0.5s ease;
      }
      ~ #{$pcard} {
        top: 0;

      }
    }
  }
}

@mixin rotation($left: null, $min-scale: 0.4, $coeff: 6) {
  $scale: 1;
  $opacity: 1;
  $last: 0;
  $min-opacity: map-fetch($config, small-card, min-opacity);
  
  @for $i from 0 through 100 {
    $step: $i;
    $decrementer: (100 - $i)/100 * $shadow-spread;
    
    #{$step}% {
      position: absolute;
      
      @if $i % 24 == 0 {
        top: $i;
      }

      @if $step <= 50 {
        
        left: #{$i * $coeff}px;
        z-index: 2;
        $last: $i * $coeff;
        
      } @else {

        left: if($last <= map-fetch($config, small-card, left-distance), 
              map-fetch($config, small-card, left-distance), 
              #{$last}px);
        
        transform: scale($scale); 
        z-index: 0;
       
      }
    }
    
    $last: $last - 10;
    
    $scale:  if($scale > $min-scale, 
             $scale - (0.1 / (10 - $min-scale)), 
             $min-scale);
    
  } 
}

@keyframes primary {
  @include rotation(true, map-fetch($config, small-card, min-scale), 9.5);
}

.is-hidden {
  opacity: 0;
  visibility: 0;
  position: absolute;
}

.container {
  width: 500px;
  position: relative;
}

body {
  background: url(map-get($config, bg-image)) no-repeat center center fixed;
  background-size: cover;
  
  display: flex;
  justify-content: center;
  
  color: map-fetch($config, colors, text);
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;
}