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              <div class="house" id="house" data-rooms="6">
  <div class="house-wings" data-flip-key="wings">
    <div class="house-left-wing">
      <div class="house-window"></div>
      <div class="house-window"></div>
      <div class="house-sparkle">
        <div class="house-sparkle-dots"></div>
      </div>
    </div>
    <div class="house-right-wing">      
      <div class="house-window"></div>
      <div class="house-window"></div>
      <div class="house-sparkle">
        <div class="house-sparkle-dots"></div>
      </div>
    </div>
    <div class="house-roof">
      <div class="house-ledge"></div>
    </div>
  </div>
  <div class="house-front" data-flip-key="front">
    <div class="house-chimney"></div>
    <div class="house-facade"></div>
    <div class="house-window">
      <div class="house-sparkle">
        <div class="house-sparkle-dots"></div>
      </div>
    </div>
    <div class="house-doorway">
      <div class="house-stairs"></div>
      <div class="house-door"></div>
    </div>
    <div class="house-gable">      
      <div class="house-roof">
        <div class="house-ledge"></div>
      </div>
    </div>
  </div>
</div>

<label class="house-label" for="range" id="label">Rooms</label>
<input type="range" min="3" max="6" step="1" value="6" id="range">
            
          
!
            
              $color-primary: #224889;
$color-roof: #A6CFFF;
$color-ledge: #79AAFF;
$color-window-left: #65EBFF;
$color-window-right: #71FBFF;
$color-window: linear-gradient(to right, $color-window-left, $color-window-left 49.9%, $color-window-right 50%, $color-window-right);
$color-shadow: #E1EAFF;
$duration: 500ms;
$delay: 70ms;
$easing: cubic-bezier(.1, 0, .3, 1);

$parts: (
  6: (
    wings: 425px,
    front: 150px,
  ),
  5: (
    wings: 355px,
    front: 150px,
  ),
  4: (
    wings: 300px,
    front: 125px,
  ),
  3: (
    wings: 240px,
    front: 150px,
  ),
);

@each $rooms, $dimensions in $parts {
  [data-rooms="#{$rooms}"] {
    @each $part, $width in $dimensions {
      .house-#{$part} {
        width: $width;
        left: calc(50% - #{$width / 2});
      }
      #{--#{$part}-width}: $width;
    }
  }
}

.house {
  height: 225px;
  width: 520px;
}

.house-label {
  text-transform: uppercase;
  font-weight: bold;
  padding-left: calc(20px + 1ch);
  font-size: 25px;
  color: $color-primary;
  margin: 30px 0 5px;
  font-family: Arial Rounded MT Bold, Helvetica Neue, Helvetica, sans serif;
  
  &:before, &:after {
    position: absolute;
    text-align: right;
    left: 0;
    top: 0;
    padding: 0 .5ch;
    will-change: transform;
  }
  
  &:before {
    content: attr(data-prev-rooms);
  }
  
  &:after {
    content: attr(data-rooms);
  }
  
  @for $i from 6 through 3 {
    &[data-rooms="#{$i}"][data-rooms-delta^="-"] {
      &:before {
        animation: prev-label-up-#{$i} $duration $easing both;
      }
      &:after {
        animation: label-up-#{$i} $duration * 2 $easing both;
      }
    }

    &[data-rooms="#{$i}"]:not([data-rooms-delta^="-"]) {
      &:before {
        animation: prev-label-down-#{$i} $duration $delay $easing both;
      }
      &:after {
        animation: label-down-#{$i} $duration * 2 $delay $easing both;
      }
    }

    @keyframes prev-label-up-#{$i} {
      from {
        transform: translateY(0);
        opacity: 1;
      }
      to {
        transform: translateY(-100%) scale(1.5);
        opacity: 0;
      }
    }
    @keyframes prev-label-down-#{$i} {
      from {
        transform: translateY(0);
        opacity: 1;
      }
      to {
        transform: translateY(100%) scale(1.5);
        opacity: 0;
      }
    }

    @keyframes label-up-#{$i} {
      from {
        transform: translateY(100%);
        opacity: 0;
      }
      50% {
        transform: translateY(0) scale(1.5);
        opacity: 1;
      }
      to {
        transform: translateY(0);
        opacity: 1;
      }
    }
    @keyframes label-down-#{$i} {
      from {
        transform: translateY(-100%);
        opacity: 0;
      }
      50% {
        transform: translateY(0) scale(1.5);
        opacity: 1;
      }
      to {
        transform: translateY(0);
        opacity: 1;
      }
    }
  }
}



.house-wings {
  position: absolute;
  bottom: 0;
  height: 125px;
  
  &:before {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    border: 5px solid $color-primary;
    box-shadow: inset 0 15px $color-shadow;
  }
  
  &:after {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 5px;
    width: 100%;
    background-color: $color-primary;
    transform: scaleX(1.2)
  }
  
  > .house-roof {
    height: 65px;
    width: calc(100% + 40px);
    left: -20px;
    border-bottom: 5px solid $color-primary;
    position: absolute;
    bottom: 100%;
    
    &:before, &:after {
      position: absolute;
      height: 100%;
      width: 50%;
      background-color: $color-roof;
      border: 5px solid $color-primary;
      border-bottom: none;
    }
    
    &:before {
      left: 0;
      transform-origin: bottom left;
      transform: skewX(-30deg);
      border-right: none;
    }
    &:after {
      right: 0;
      transform-origin: bottom right;
      transform: skewX(30deg);
      border-left: none;
    }
  }
  
  .house-ledge {
    position: absolute;
    bottom: -15px;
    width: 100%;
    height: 15px;
    border: 5px solid $color-primary;
    background-color: $color-ledge;
  }
}

.house-facade {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  box-shadow: 15px 0 rgba(darken($color-shadow, 20%), 0.2);
  
  &:before, &:after {
    position: absolute;
    height: 100%;
    width: 50%;
    background-color: #fff;
    top: 0;
    border-top: 5px solid $color-primary;
    box-shadow: inset 0 calc(var(--front-width) / 6) $color-shadow;
  }
  
  &:before {
    left: 0;
    transform-origin: top left;
    transform: skewY(-40deg);
    border-left: 5px solid $color-primary;
  }
  
  &:after {
    right: 0;
    transform-origin: top right;
    transform: skewY(40deg);
    border-right: 5px solid $color-primary;
  }
}

$wing-roof-moves: (
  6: (
    (origin: bottom left, transform: translateY(-10px) rotate(-5deg)),
    (origin: bottom right, transform: translateY(-5px) rotate(2deg)),
  ),
  5: (
    (origin: bottom right, transform: translateY(-20px) rotate(10deg)),
    (origin: bottom left, transform: translateY(-10px) rotate(-2deg)),
  ),
  4: (
    (origin: bottom left, transform: translateY(-15px) rotate(-10deg)),
    (origin: bottom right, transform: translateY(-10px) rotate(2deg)),
  ),
  3: (
    (origin: bottom right, transform: translateY(-20px) rotate(10deg)),
    (origin: bottom left, transform: translateY(-10px) rotate(-2deg)),
  ),
);

$front-roof-moves: (
  6: (
    (origin: bottom right, transform: translateY(-5px) rotate(5deg)),
    (origin: bottom left, transform: translateY(-2px) rotate(-1deg)),
  ),
  5: (
    (origin: bottom left, transform: translateY(-10px) rotate(-5deg)),
    (origin: bottom right, transform: translateY(-5px) rotate(1deg)),
  ),
  4: (
    (origin: bottom right, transform: translateY(-5px) rotate(10deg)),
    (origin: bottom left, transform: translateY(-2px) rotate(-2deg)),
  ),
  3: (
    (origin: bottom right, transform: translateY(-10px) rotate(-5deg)),
    (origin: bottom left, transform: translateY(-5px) rotate(2deg)),
  ),
);

$house-moves: (
  6: (
    (transform: scale(.95, 1.05)),
    (transform: scale(.98, 1.02)),
  ),
  5: (
    (transform: scale(.9, 1.2)),
    (transform: scale(.95, 1.05)),
  ),
  4: (
    (transform: scale(.9, 1.2)),
    (transform: scale(.95, 1.05)),
  ),
  3: (
    (transform: scale(.9, 1.2)),
    (transform: scale(.95, 1.05)),
  ),
);

$facade-moves: (
  6: (
    (transform: scale(.95, 1.05)),
    (transform: scale(.98, 1.02)),
  ),
  5: (
    (transform: scale(.9, 1.05)),
    (transform: scale(.95, 1.02)),
  ),
  4: (
    (transform: scale(.9, 1.05)),
    (transform: scale(.95, 1.02)),
  ),
  3: (
    (transform: scale(.9, 1.05)),
    (transform: scale(.95, 1.02)),
  ),
);

$chimney-moves: (
  6: (
    (transform: rotate(10deg) translateY(-15px)),
    (transform: rotate(-5deg) translateY(-5px)),
  ),
  5: (
    (transform: rotate(-10deg) translateY(-15px)),
    (transform: rotate(5deg) translateY(-5px)),
  ),
  4: (
    (transform: rotate(10deg) translateY(-15px)),
    (transform: rotate(-5deg) translateY(-5px)),
  ),
  3: (
    (transform: rotate(-10deg) translateY(-15px)),
    (transform: rotate(5deg) translateY(-5px)),
  ),
);
    
$move-parts: (
  wing-roof: $wing-roof-moves,
  front-roof: $front-roof-moves,
  house: $house-moves,
  facade: $facade-moves,
  chimney: $chimney-moves,
);

@function either($a, $b) {
  @return if($a, $a, $b);
}

@each $part, $move-config in $move-parts {
  @each $rooms, $moves in $move-config {
    $move-1: nth($moves, 1);
    $move-2: nth($moves, 2);
  @keyframes #{$part}-#{$rooms}-move {
      from {
        transform-origin: either(map-get($move-1, origin), bottom center);
      }
      25% {
        transform: map-get($move-1, transform);
      }
      50% {
        transform-origin: either(map-get($move-1, origin), bottom center);
        transform: none;
      }
      51% {
        transform-origin: either(map-get($move-2, origin), bottom center);
      }
      75% {
        transform-origin: either(map-get($move-2, origin), bottom center);
        transform: map-get($move-2, transform);
      }
      to {
        transform-origin: either(map-get($move-2, origin), bottom center);
        transform: none;
      }
    }
  }
}

@for $i from 6 through 3 {
  [data-rooms="#{$i}"] {
    .house-wings > .house-roof {
      animation: wing-roof-#{$i}-move $duration $delay $easing;
    }
    .house-front > .house-gable {
      animation: front-roof-#{$i}-move $duration $delay $easing;
    }
    .house-wings:before,
    .house-left-wing,
    .house-right-wing {
      animation: house-#{$i}-move $duration $delay $easing;
    }
    .house-facade,
    .house-front .house-window,
    .house-doorway {
      animation: facade-#{$i}-move $duration $delay $easing;
    }
    .house-chimney {
      animation: chimney-#{$i}-move $duration $delay $easing;
    }
  }
}


.house-front {
  position: absolute;
  bottom: 0;
  height: 160px;
  
  > .house-window {
    width: 60px;
    height: 55px;
    position: absolute;
    left: calc(50% - 30px);
    top: -10px;
    
    [data-rooms="4"] &,
    [data-rooms="3"] & {
      border-bottom-left-radius: 50% 40%;
      border-bottom-right-radius: 50% 40%;
      
      &:after {
        display: none;
      }
    }
    
    [data-rooms="4"]:not([data-prev-rooms="3"]) &,
    [data-rooms="3"]:not([data-prev-rooms="4"]) &,
    [data-rooms="5"]:not([data-prev-rooms="6"]) &,
    [data-rooms="6"]:not([data-prev-rooms="5"]) &,
    {
      > .house-sparkle {
        display: block;
      }
    }
    
    > .house-sparkle {
      display: none;
    }
  }
  
  .house-ledge {
    height: 20px;
    width: 20px;
    position: absolute;
    background: #000;
    left: calc(50% - 10px);
    background-color: $color-ledge;
    border: 5px solid $color-primary;
    transform: rotate(-45deg) translate(5px, -5px);
    
    &:before, &:after {
      position: absolute;
      width: calc(var(--front-width) / 1.25);
      height: calc(100% + 10px);
      top: -5px;
      background-color: $color-ledge;
      border: 5px solid $color-primary;
    }
    
    &:before {
      right: 100%;
      border-right: none;
    }
    &:after {
      left: 0;
      transform-origin: left bottom;
      transform: rotate(90deg) translate(-5px, 5px);
      border-left: none;
    }
    
  }
}

.house-gable {
  position: absolute;
  bottom: calc(100% - 5px);
  left: 0;
  width: 100%;
  height: 70px;
  
  > .house-roof {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: scaleY(0.8);
    z-index: 1;
  }
}

.house-chimney {
  width: 35px;
  height: 70px;
  position: absolute;
  background-color: $color-primary;
  left: 15px;
  bottom: 100%;
  z-index: 0;
}

.house-left-wing,
.house-right-wing {
  position: absolute;
  height: 100%;
  width: calc(50% - var(--front-width) / 2);
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

.house-wings {
  .house:not([data-rooms="6"]) & {
    .house-window:first-child {
      display: none;
    }
  }
  
  .house[data-rooms="3"] & {
    .house-window {
      display: none;
    }
  }
  
  .house[data-rooms="6"] &,
  .house[data-rooms="5"]:not([data-prev-rooms="4"]) &,
  .house[data-rooms="4"][data-prev-rooms="3"] &,
  .house[data-rooms="3"] & {
    .house-sparkle {
      display: block;
    }
  }
}

.house-left-wing {
  left: 0;
}

.house-right-wing {
  right: 0;
  flex-flow: row-reverse;
}

.house-sparkle {
  position: absolute;
  height: 90px;
  width: 90px;
  border-radius: 50%;
  border: 5px solid $color-primary;
  top: calc(50% - 45px);
  left: calc(50% - 45px);
  display: none;
  // animation-iteration-count: infinite !important;
  
  &:before {
    top: 0;
    left: 0;
    background-color: $color-window-left;
  }
  
  &:after {
    bottom: 0;
    right: 0;
    background-color: $color-primary;
  }
}

.house-sparkle,
.house-sparkle-dots {
  &:before, &:after {
    position: absolute;
    height: 10px;
    width: 10px;
    border-radius: 50%;
  }
}

.house-sparkle-dots {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  
  &:before {
    bottom: -15px;
    right: 40px;
    background-color: $color-roof;
  }
}
  
.house[data-rooms="6"] {
  .house-left-wing .house-sparkle {
    left: calc(25% - 45px);
  }
  .house-right-wing .house-sparkle {
    left: initial;
    right: calc(25% - 45px);
  }
}

@each $rooms in 6 5 4 3 {
  @keyframes sparkle-#{$rooms} {
    from {
      transform: scale(1);
      opacity: 1;
    }
    to {
      transform: scale(2);
      opacity: 0;
      border-width: 0;
    }
  }
  
  @keyframes sparkle-dots-#{$rooms} {
    from {
      transform: scale(1);
    }
    to {
      transform: scale(0);
    }
  }
  
  .house[data-rooms="#{$rooms}"] {
    .house-sparkle {
      animation: sparkle-#{$rooms} $duration $easing both;
    }
    
    .house-sparkle,
    .house-sparkle-dots {
      &:before, &:after {
        animation: sparkle-dots-#{$rooms} $duration $easing both;
      }
    }
  }
}

@keyframes windows-leave {
  to {
    width: 0;
  }
}

.house-window {
  height: 60px;
  width: 30px;
  border: 5px solid $color-primary;
  border-top-left-radius: 30px;
  border-top-right-radius: 30px;
  background-image: $color-window;
  
  &:before {
    height: 100%;
    width: 5px;
    left: calc(50% - 2.5px);
    top: 0;
    background-color: $color-primary;
  }
  
  &:after {
    height: 15px;
    width: calc(100% + 20px);
    left: -10px;
    bottom: 5px;
    border-radius: 15px;
    background-color: $color-ledge;
    border: 5px solid $color-primary;
    box-shadow: 0 5px $color-shadow;
  }
}

.house-doorway {
  width: 65px;
  height: 90px;
  position: absolute;
  bottom: 0;
  left: calc(50% - 65px / 2);
}

.house-stairs {
  width: 100%;
  position: absolute;
  bottom: 0;
  left: 0;
  height: 15px;
  border: 5px solid $color-primary;
  z-index: 0;
  box-shadow: 5px -5px $color-shadow;
  
  &, &:before, &:after {
    background-color: white;
  }
  
  &:before, &:after {
    box-shadow: 5px -5px $color-shadow;
    position: absolute;
    height: 15px;
    width: 100%;
    border: 5px solid $color-primary;
  }
  
  &:before {
    bottom: 100%;
    transform: scaleX(.9);
    z-index: 0;
  }
  
  &:after {
    bottom: calc(200% + 5px);
    transform: scaleX(.75);
    z-index: 0;
  }
}

.house-door {
  position: absolute;
  background-color: $color-primary;
  width: 50%;
  height: 55px;
  left: 25%;
  bottom: 35px;
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
}


body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #EFEFEF;
}

body, html {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

*, *:before, *:after {
  box-sizing: border-box;
  position: relative; // don't @ me
}

*:before, *:after {
  content: '';
  display: block;
}




// Styling input ranges is painful

// Styling Cross-Browser Compatible Range Inputs with Sass
// Github: https://github.com/darlanrod/input-range-sass
// Author: Darlan Rod https://github.com/darlanrod
// Version 1.4.1
// MIT License

$track-color: linear-gradient(to bottom, $color-ledge, $color-ledge 49.9%, darken($color-ledge, 5%) 50%, darken($color-ledge, 5%) 100%) !default;
$thumb-color: $color-primary !default;

$thumb-radius: 20px !default;
$thumb-height: 40px !default;
$thumb-width: 40px !default;

$track-width: 330px !default;
$track-height: 25px !default;
$track-shadow-color: rgba(0, 0, 0, .2) !default;
$track-border-width: 5px !default;
$track-border-color: $color-primary !default;

$track-radius: 25px !default;

@mixin track {
  cursor: pointer;
  height: $track-height;
  transition: all .2s ease;
  width: $track-width;
}

@mixin thumb {
  background: $thumb-color;
  border-radius: $thumb-radius;
  cursor: pointer;
  height: $thumb-height;
  width: $thumb-width;
}

[type='range'] {
  -webkit-appearance: none;
  margin: $thumb-height / 2 0;
  width: $track-width;

  &:focus {
    outline: 0;

    &::-webkit-slider-runnable-track {
      background: $track-color;
    }

    &::-ms-fill-lower {
      background: $track-color;
    }

    &::-ms-fill-upper {
      background: $track-color;
    }
  }

  &::-webkit-slider-runnable-track {
    @include track;
    background: $track-color;
    border: $track-border-width solid $track-border-color;
    border-radius: $track-radius;
  }

  &::-webkit-slider-thumb {
    @include thumb;
    -webkit-appearance: none;
    margin-top: ((-$track-border-width * 2 + $track-height) / 2) - ($thumb-height / 2);
  }

  &::-moz-range-track {
    @include track;
    background: $track-color;
    border: $track-border-width solid $track-border-color;
    border-radius: $track-radius;
  }

  &::-moz-range-thumb {
    @include thumb;
  }

  &::-ms-track {
    @include track;
    background: transparent;
    border-color: transparent;
    border-width: ($thumb-height / 2) 0;
    color: transparent;
  }

  &::-ms-fill-lower {
    background: $track-color;
    border: $track-border-width solid $track-border-color;
    border-radius: $track-radius * 2;
  }

  &::-ms-fill-upper {
    background: $track-color;
    border: $track-border-width solid $track-border-color;
    border-radius: $track-radius * 2;
  }

  &::-ms-thumb {
    @include thumb;
    margin-top: 0;
  }
}
            
          
!
            
              const house = document.querySelector('#house');
const range = document.querySelector('#range');
const label = document.querySelector('#label');

const f = new Flipping();
const update = f.wrap(rooms => {
  const prevRooms = house.getAttribute('data-rooms');
  house.setAttribute('data-prev-rooms', prevRooms);
  house.setAttribute('data-rooms', rooms);
  
  label.setAttribute('data-prev-rooms', prevRooms);
  label.setAttribute('data-rooms', rooms);
  label.setAttribute('data-rooms-delta', rooms - prevRooms);
});

const range$ = Rx.Observable
  .fromEvent(range, 'input')
  .map(e => e.target.value)
  .startWith(6);

range$.subscribe(update);

            
          
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