<main id=app>
    
  <p>Please checkout the newer version of this; <a target="_top" href="https://codepen.io/simeydotme/pen/abYWJdX">https://codepen.io/simeydotme/pen/abYWJdX</a></p>
  
  <h1>Pokemon Card, Holo Effect</h1>
  
  <section class="cards">
    <div class="card charizard animated"></div>
    <div class="card pika animated"></div>
    <div class="card eevee animated"></div>
    <div class="card mewtwo animated"></div>
  </section>
  

  
  
  
  
  <style class="hover"></style>
  
  <section class="demo">
    <div class="card"></div>
    <span class="operator">+</span>
    <div class="card"><span>color-dodge</span></div>
    <span class="operator">+</span>
    <div class="card"><span>color-dodge</span></div>
  </section>

  
</main>


<section class="promo">
  <p>
  <a target="_top" href="https://codepen.io/simeydotme/pen/abYWJdX">
    View Version 2, much improved here
    <img src="https://assets.codepen.io/13471/internal/screenshots/pens/abYWJdX.custom.png?version=1674760356" alt="">
  </a>
  </p>
</section>

:root {
  --color1: rgb(0, 231, 255);
  --color2: rgb(255, 0, 231);
  --back: url(https://cdn2.bulbagarden.net/upload/1/17/Cardback.jpg);
  --charizard1: #fac;
  --charizard2: #ddccaa;
  --charizardfront: url(https://assets.codepen.io/13471/charizard-gx.webp);
  --pika1: #54a29e;
  --pika2: #a79d66;
  --pikafront: url(https://assets.codepen.io/13471/pikachu-gx.webp);
  --eevee1: #efb2fb;
  --eevee2: #acc6f8;
  --eeveefront: url(https://assets.codepen.io/13471/eevee-gx.webp);
  --mewtwo1: #efb2fb;
  --mewtwo2: #acc6f8;
  --mewtwofront: url(https://assets.codepen.io/13471/mewtwo-gx.webp);
}



.card {

  width: 71.5vw;
  height: 100vw;
    // width: clamp(200px, 61vh, 18vw);
    // height: clamp(280px, 85vh, 25.2vw);
  @media screen and (min-width: 600px) {
    // width: 61vh;
    // height: 85vh;
    // max-width: 500px;
    // max-height: 700px;
    width: clamp(12.9vw, 61vh, 18vw);
    height: clamp(18vw, 85vh, 25.2vw);
  }
  
  position: relative;
  overflow: hidden;
  margin: 20px;
  overflow: hidden;
  z-index: 10;
  touch-action: none;
  
  border-radius: 5% / 3.5%;
  box-shadow: 
    -5px -5px 5px -5px var(--color1), 
    5px 5px 5px -5px var(--color2), 
    -7px -7px 10px -5px transparent, 
    7px 7px 10px -5px transparent, 
    0 0 5px 0px rgba(255,255,255,0),
    0 55px 35px -20px rgba(0, 0, 0, 0.5);
  
  transition: transform 0.5s ease, box-shadow 0.2s ease;
  will-change: transform, filter;
  
  background-color: #040712;
  background-image: var(--front);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: 50% 50%;
  transform-origin: center;
  
}

.card:hover {
  box-shadow: 
    -20px -20px 30px -25px var(--color1), 
    20px 20px 30px -25px var(--color2), 
    -7px -7px 10px -5px var(--color1), 
    7px 7px 10px -5px var(--color2), 
    0 0 13px 4px rgba(255,255,255,0.3),
    0 55px 35px -20px rgba(0, 0, 0, 0.5);
}

.card.charizard {
  --color1: var(--charizard1);
  --color2: var(--charizard2);
  --front: var(--charizardfront);
}
.card.pika {
  --color1: var(--pika1);
  --color2: var(--pika2);
  --front: var(--pikafront);
}
.card.mewtwo {
  --color1: var(--mewtwo1);
  --color2: var(--mewtwo2);
  --front: var(--mewtwofront);
}
.card.eevee {
  --color1: #ec9bb6;
  --color2: #ccac6f;
  --color3: #69e4a5;
  --color4: #8ec5d6;
  --color5: #b98cce;
  --front: var(--eeveefront);
}

.card:before,
.card:after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background-repeat: no-repeat;
  opacity: .5;
  mix-blend-mode: color-dodge;
  transition: all .33s ease;
}

.card:before {
  background-position: 50% 50%;
  background-size: 300% 300%;
  background-image: linear-gradient(
    115deg,
    transparent 0%,
    var(--color1) 25%,
    transparent 47%,
    transparent 53%,
    var(--color2) 75%,
    transparent 100%
  );
  opacity: .5;
  filter: brightness(.5) contrast(1);
  z-index: 1;
}

.card:after {
  opacity: 1;
  background-image: url("https://assets.codepen.io/13471/sparkles.gif"), 
    url(https://assets.codepen.io/13471/holo.png), 
    linear-gradient(125deg, #ff008450 15%, #fca40040 30%, #ffff0030 40%, #00ff8a20 60%, #00cfff40 70%, #cc4cfa50 85%);
  background-position: 50% 50%;
  background-size: 160%;
  background-blend-mode: overlay;
  z-index: 2;
  filter: brightness(1) contrast(1);
  transition: all .33s ease;
  mix-blend-mode: color-dodge;
  opacity: .75;
}

.card.active:after,
.card:hover:after {
  filter: brightness(1) contrast(1);;
  opacity: 1;
}

.card.active,
.card:hover {
  animation: none;
  transition: box-shadow 0.1s ease-out;
}

.card.active:before,
.card:hover:before {
  animation: none;
  background-image: linear-gradient(
    110deg,
    transparent 25%,
    var(--color1) 48%,
    var(--color2) 52%,
    transparent 75%
  );
  background-position: 50% 50%;
  background-size: 250% 250%;
  opacity: .88;
  filter: brightness(.66) contrast(1.33);
  transition: none;
}

.card.active:before,
.card:hover:before,
.card.active:after,
.card:hover:after {
  animation: none;
  transition: none;
}

.card.animated {
  transition: none;
  animation: holoCard 12s ease 0s 1;
  &:before { 
    transition: none;
    animation: holoGradient 12s ease 0s 1;
  }
  &:after {
    transition: none;
    animation: holoSparkle 12s ease 0s 1;
  }
}




@keyframes holoSparkle {
  0%, 100% {
    opacity: .75; background-position: 50% 50%; filter: brightness(1.2) contrast(1.25);
  }
  5%, 8% {
    opacity: 1; background-position: 40% 40%; filter: brightness(.8) contrast(1.2);
  }
  13%, 16% {
    opacity: .5; background-position: 50% 50%; filter: brightness(1.2) contrast(.8);
  }
  35%, 38% {
    opacity: 1; background-position: 60% 60%; filter: brightness(1) contrast(1);
  }
  55% {
    opacity: .33; background-position: 45% 45%; filter: brightness(1.2) contrast(1.25);
  }
}

@keyframes holoGradient {
  0%, 100% {
    opacity: 0.5;
    background-position: 50% 50%;
    filter: brightness(.5) contrast(1);
  }
  5%, 9% {
    background-position: 100% 100%;
    opacity: 1;
    filter: brightness(.75) contrast(1.25);
  }
  13%, 17% {
    background-position: 0% 0%;
    opacity: .88;
  }
  35%, 39% {
    background-position: 100% 100%;
    opacity: 1;
    filter: brightness(.5) contrast(1);
  }
  55% {
    background-position: 0% 0%;
    opacity: 1;
    filter: brightness(.75) contrast(1.25);
  }
}

@keyframes holoCard {
  0%, 100% {
    transform: rotateZ(0deg) rotateX(0deg) rotateY(0deg);
  }
  5%, 8% {
    transform: rotateZ(0deg) rotateX(6deg) rotateY(-20deg);
  }
  13%, 16% {
    transform: rotateZ(0deg) rotateX(-9deg) rotateY(32deg);
  }
  35%, 38% {
    transform: rotateZ(3deg) rotateX(12deg) rotateY(20deg);
  }
  55% {
    transform: rotateZ(-3deg) rotateX(-12deg) rotateY(-27deg);
  }
}



.card.eevee:hover {
  box-shadow: 
    0 0 30px -5px white,
    0 0 10px -2px white,
    0 55px 35px -20px rgba(0, 0, 0, 0.5);
}
.card.eevee:hover:before,
.card.eevee.active:before {
  background-image: linear-gradient(
    115deg,
    transparent 20%,
    var(--color1) 36%,
    var(--color2) 43%,
    var(--color3) 50%,
    var(--color4) 57%,
    var(--color5) 64%,
    transparent 80%
  );
}




.demo .card {
  background-image: var(--back);
  font-size: 2vh
}
.demo .card > span {
  position: relative;
  top: 45%;
}

.demo .card:nth-of-type(1),
.demo .card:nth-of-type(2),
.demo .card:nth-of-type(3) {
  width: 20vh;
  height: 27.5vh;
  box-shadow: inset 0 0 0 1px rgba(white,0.4), 0 25px 15px -10px rgba(0, 0, 0, 0.5);
  animation: none;
}

.demo .card:nth-of-type(1),
.demo .card:nth-of-type(2),
.demo .card:nth-of-type(3) {
  &:before, &:after {
    animation: none;
    // opacity: 1;
  } 
}
.demo .card:nth-of-type(1) {
  &:before, &:after { display: none; }
}
.demo .card:nth-of-type(2) {
  background: none;
  &:before { display: none; }
}
.demo .card:nth-of-type(3) {
  background: none;
  &:after { display: none; }
}

.operator {
  display: inline-block;
  vertical-align: middle;
  font-size: 6vh;
}






html, body {
  height: 100%;
  background-color: #333844;
  padding: 0;
  z-index: 1;
  transform: translate3d(0,0,0.1px);
}
body {
  color: white;
  background-color: #333844;
  font-family: "Heebo", sans-serif;
  text-align: center;
}
h1 {
  display: block;
  margin: 30px 0;
}
p {
  margin-top: 5px;
  font-weight: 200;
}
#app {
  position: relative;
}

.demo,
.cards { 
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-evenly;
  perspective: 2000px;
  position: relative;
  z-index: 1;
  transform: translate3d(0.1px, 0.1px, 0.1px )
}
.demo {
  flex-direction: row;
  justify-content: center;
}

@media screen and (min-width: 600px) {
  .cards {
    flex-direction: row;
  }
}






.cards .card {
  &:nth-child(2) {
    &, &:before, &:after {
      animation-delay: 0.25s;
    }
  }
  &:nth-child(3) {
    &, &:before, &:after {
      animation-delay: 0.5s;
    }
  }
  &:nth-child(4) {
    &, &:before, &:after {
      animation-delay: 0.75s;
    }
  }
}


p {
  font-weight: 400;
  font-size: 18px;
  padding: 1em;
  background: rgba(0,0,0,0.3);
  margin-top: 0;
  animation: rubberBand 1.5s linear 3s 1;
}
.promo {
  margin-top: 50px;
}
.promo img {
  margin-top: 10px;
  max-width: 80%;
}
p a {
  color: cyan;
}

html,body,main {
  min-height: 100%;
}



@keyframes rubberBand {
  from {
    transform: scale3d(1, 1, 1);
  }

  30% {
    transform: scale3d(1.25, 0.75, 1);
  }

  40% {
    transform: scale3d(0.75, 1.25, 1);
  }

  50% {
    transform: scale3d(1.15, 0.85, 1);
  }

  65% {
    transform: scale3d(0.95, 1.05, 1);
  }

  75% {
    transform: scale3d(1.05, 0.95, 1);
  }

  to {
    transform: scale3d(1, 1, 1);
  }
}

/*

  using 
    - an animated gif of sparkles.
    - an animated gradient as a holo effect.
    - color-dodge mix blend mode
  
*/
var x;
var $cards = $(".card");
var $style = $(".hover");

$cards
  .on("mousemove touchmove", function(e) { 
    // normalise touch/mouse
    var pos = [e.offsetX,e.offsetY];
    e.preventDefault();
    if ( e.type === "touchmove" ) {
      pos = [ e.touches[0].clientX, e.touches[0].clientY ];
    }
    var $card = $(this);
    // math for mouse position
    var l = pos[0];
    var t = pos[1];
    var h = $card.height();
    var w = $card.width();
    var px = Math.abs(Math.floor(100 / w * l)-100);
    var py = Math.abs(Math.floor(100 / h * t)-100);
    var pa = (50-px)+(50-py);
    // math for gradient / background positions
    var lp = (50+(px - 50)/1.5);
    var tp = (50+(py - 50)/1.5);
    var px_spark = (50+(px - 50)/7);
    var py_spark = (50+(py - 50)/7);
    var p_opc = 20+(Math.abs(pa)*1.5);
    var ty = ((tp - 50)/2) * -1;
    var tx = ((lp - 50)/1.5) * .5;
    // css to apply for active card
    var grad_pos = `background-position: ${lp}% ${tp}%;`
    var sprk_pos = `background-position: ${px_spark}% ${py_spark}%;`
    var opc = `opacity: ${p_opc/100};`
    var tf = `transform: rotateX(${ty}deg) rotateY(${tx}deg)`
    // need to use a <style> tag for psuedo elements
    var style = `
      .card:hover:before { ${grad_pos} }  /* gradient */
      .card:hover:after { ${sprk_pos} ${opc} }   /* sparkles */ 
    `
    // set / apply css class and style
    $cards.removeClass("active");
    $card.removeClass("animated");
    $card.attr( "style", tf );
    $style.html(style);
    if ( e.type === "touchmove" ) {
      return false; 
    }
    clearTimeout(x);
  }).on("mouseout touchend touchcancel", function() {
    // remove css, apply custom animation on end
    var $card = $(this);
    $style.html("");
    $card.removeAttr("style");
    x = setTimeout(function() {
      $card.addClass("animated");
    },2500);
  });