.container
  .text(data-splitting='') Happy Birthday, JavaScript!
  .presents
    .present.orange
      .lid
      .box
      .bow
      .ribbon
    .present.blue
      .lid
      .box
      .bow
      .ribbon
    .present.green
      .lid
      .box
      .bow
      .ribbon

@import url('https://fonts.googleapis.com/css2?family=Fredoka+One&display=swap');

$border-color: #2C3A49;
$border: 4px solid $border-color;
$border-radius: 5px;

body {
  background: #34E1FF;
  font-family: 'Fredoka One', cursive;
  overflow-x: hidden;
}

.container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.text {
  min-width: 100%;
  text-align: center;
  color: white;
  text-shadow: 1px 1px $border-color;
  font-size: 3em;
}

.text .char {
  animation: slide-in 1s cubic-bezier(.5, 0, .5, 1) both;
  animation-delay: calc(60ms * var(--char-index));
}

@keyframes slide-in {
  from {
    transform: translateY(-1em) rotate(-.5turn) scale(0.5);
    opacity: 0;
  }
}

.presents {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  height: 200px;
}

@mixin present($name, $positionx, $box-color, $bow-color, $dot-color, $width, $height, $z-index) {
  position: relative;
  left: $positionx;
  width: $width;
  height: $height;
  z-index: $z-index;
  
  &:hover {
    animation: .5s #{$name};
  }

  .lid {
    background: $box-color;
  }
  .box {
    background-image: radial-gradient($dot-color 20%, transparent 20%),
      radial-gradient($dot-color 20%, transparent 20%);
    background-color: $box-color;
  }
  .ribbon {
    background: $bow-color;
    &::before {
      top: 21%;
    }
  }
  .bow {
    background: $bow-color;
    &::before, &::after {
      background: $bow-color;
    }
  }
  
  @keyframes #{$name} {
    0% {
      width: $width;
      height: $height;
    }
    30% {
      width: calc(#{$width} + 10px);
      height: calc(#{$height} - 10px);
    }
    60% {
      width: calc(#{$width} - 10px);
      height: calc(#{$height} + 10px);
    }
    100% {
      width: $width;
      height: $height;
    }
  }
}

.green {
  @include present('green', -20px, #3DDC81, #F75D4C, #fff, 100px, 100px, 1);
}

.orange {
  @include present('orange', 20px, #FFA726, #F75D4C, $border-color, 130px, 120px, 10);
}

.blue {
    @include present('blue', 0, #1BB5FE, #3DDC81, transparent, 120px, 160px, 0);
}

.present {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  .lid {
    height: 20%;
    width: calc(100% + 10px);
    border: $border;
    border-radius: $border-radius;
    box-shadow: inset 2px 2px rgba(255,255,255,.5), 5px 0 rgba(0,0,0,.15);
  }
  .box {
    width: 100%;
    height: 100%;
  background-position: 0 0, 20px 20px;
  background-size: 40px 40px;
    border: $border;
    border-top: 0;
    border-bottom-left-radius: $border-radius;
    border-bottom-right-radius: $border-radius;
    box-shadow: inset -10px 5px rgba(0,0,0,.3), 5px 0 rgba(0,0,0,.15);
  }
  .ribbon {
    position: absolute;
    top: -3px;
    width: 30px;
    height: calc(100% - 5px);
    border: $border;
    border-radius: $border-radius;
    box-shadow: inset 2px 2px rgba(255,255,255,.5);
    &::before {
      display: block;
      content: '';
      position: absolute;
      width: 100%;
      height: 5px;
      background: rgba(0,0,0,.3);
    }
  }
  .bow {
    position: absolute;
    top: -20px;
    width: 20px;
    height: 20px;
    border: $border;
    border-radius: 50%;
    box-shadow: inset 2px 2px rgba(255,255,255,.5), inset -2px -5px rgba(0,0,0,.3);
    &::before, &::after {
      display: block;
      content: '';
      position: absolute;
      top: -10px;
      width: 30px;
      height: 30px;
      border: $border;
      border-radius: 50%;
      box-shadow: inset 2px 2px rgba(255,255,255,.5), inset -2px -5px rgba(0,0,0,.3);
      z-index: -1;
    }
    &::before {
      left: 15px;
    }
    &::after {
      right: 15px;
    }
  }
}

document.addEventListener("click", (event) => {
  bursty(event.pageX, event.pageY);
});

setInterval(() => randomizedConfetti(), 500);

function bursty(x, y) {
  const burst = new mojs.Burst({
    left: 0,
    top: 0,
    radius: { 0: 200 },
    count: 20,
    degree: 360,
    children: {
      fill: { white: "#34E1FF" },
      duration: 2000
    }
  }).tune({
    x: x,
    y: y
  });

  burst.replay();
}

function randomizedConfetti() {
  let randomX = Math.floor(Math.random() * (document.body.clientWidth-100) + 0);
  let randomY = Math.floor(Math.random() * (window.innerHeight-200) + 0);
  const burst = new mojs.Burst({
    left: 0,
    top: 0,
    radius: { 0: 200 },
    count: 20,
    degree: 360,
    children: {
      fill: { white: "#34E1FF" },
      duration: 2000
    }
  }).tune({
    x: randomX,
    y: randomY
  });

  burst.replay();
}

Splitting();