h1.intro [CSS] 3D Switcher Vll Plus
  small click to toggle

.box
  input#io.Switcher__checkbox.sr-only(type="checkbox" checked)
  label.Switcher(for="io")
    .Switcher__trigger(data-value="SALE")
    .Switcher__trigger(data-value="RENT")

blockquote.info
  | inspired from 
  a(href="https://dribbble.com/shots/2286747-Switcher-Vll-Plus") Switcher Vll Plus
  |  by 
  a(href="https://dribbble.com/Volorf") Oleg Frolov

$c-white: #fff;
$c-black: #000;
$c-theme: #00a8ff;

.Switcher {
  position: relative;
  display: flex;
  border-radius: 5em;
  box-shadow: inset 0 0 0 1px;
  overflow: hidden;
  cursor: pointer;
  animation: r-n .5s;
  user-select: none;
  font-size: 3vmin;
  will-change: transform;
  
  .Switcher__checkbox:checked + & {
    animation-name: r-p;
  }

  @keyframes r-p {
    50% { transform: rotateY(45deg); }
  }
  @keyframes r-n {
    50% { transform: rotateY(-45deg); }
  }

  // indicator
  &::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 200%;
    border-radius: inherit;
    background-color: $c-white;
    transform: translateX(-75%);
    transition: transform .5s ease-in-out;

    .Switcher__checkbox:checked + & {
      transform: translateX(25%);
    }
  }

}

.Switcher__trigger {
  position: relative;
  z-index: 1;
  padding: 1em 5em;
  
  &::after {
    content: attr(data-value);
  }

  &::before {
    --i: var(--x);
    content: attr(data-value);
    position: absolute;
    color: $c-theme;
    transition: opacity .3s;
    opacity: calc((var(--i) + 1) / 2);
    transition-delay: calc(.3s * (var(--i) - 1) / -2);

    .Switcher__checkbox:checked + .Switcher & {
      --i: calc(var(--x) * -1);
    }
  }

  &:nth-of-type(1)::before {
    --x: 1;
  }

  &:nth-of-type(2)::before {
    --x: -1;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.box {
  display: flex;
  flex: 1;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  overflow: hidden;
  perspective: 750px;
}

/// reset
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  margin: 0;
  line-height: 1.4;
  color: $c-white;
  background-color: $c-theme;
}

.intro {
  width: 90%;
  max-width: 50rem;
  padding-top: .5em;
  padding-bottom: 1rem;
  margin: 0 auto 1em;
  font-size: calc(1rem + 2vmin);
  text-transform: capitalize;
  text-align: center;
  font-family: serif;

  small {
    display: block;
    text-align: right;
    opacity: .5;
    font-style: italic;
    text-transform: none;
    border-top: 1px dashed rgba($c-white, .75);
  }
}

.info {
  margin: 0;
  padding: 1em;
  font-size: .9em;
  font-style: italic;
  font-family: serif;
  text-align: right;
  opacity: .75;

  a {
      color: inherit;
  }
}