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              <main id="app" class="content">
  <nav class="nav">
    <menu class="nav__controls">
      <icon class="nav__icon" use="#filter"></icon>

      <li v-for="(active, menu) in menus" class="nav__label"
        :class="{
          'nav__label--active' : active,
          'nav__label--filter': activeFilters[menu].length
        }" @click="setMenu(menu, active)">
        {{ menu }}
      </li>

      <li class="nav__label nav__label--clear" @click="clearAllFilters">Clear all</li>
    </menu>

    <label class="nav__label" @click="modal = !modal">About this pen</label>
  </nav>

  <transition-group name="dropdown" tag="section" class="dropdown" :style="dropdown">
    <menu v-for="(options, filter) in filters" class="filters"
      v-show="menus[filter]" ref="menu" :key="filter">

      <li v-if="filter === 'rating'" class="filters__rating">
        <output>
          <label>Minimum rating:&nbsp;</label>
          {{ parseFloat(filters.rating).toFixed(1) }}
        </output>

        <input v-model="filters.rating" class="filters__range" type="range"
          :min="rating.min" :max="rating.max" step="0.1"/>
      </li>

      <template v-else>
        <li v-for="(active, option) in options" class="filters__item"
          :class="{ 'filters__item--active': active }"
          @click="setFilter(filter, option)">
          {{ option }}
        </li>
      </template>
    </menu>
  </transition-group>

  <transition-group name="company" tag="ul" class="content__list">
    <li class="company" v-for="company in list" :key="company.id">
      <div class="company__info">
        <icon class="company__logo" :style="`fill:${company.color}`" :use="company.logo"></icon>
        <h2 class="company__name">{{ company.name }}</h2>
        <blockquote class="company__slogan">{{ company.slogan }}</blockquote>
      </div>

      <ul class="company__details">
        <li class="company__data">
          <label class="company__label">Country</label>
          <p class="company__country"
            @click="clearFilter('countries', company.country)">
            {{ company.country }}
          </p>
        </li>

        <li class="company__data">
          <label class="company__label">Rating</label>
          <p class="company__rating">{{ company.rating.toFixed(1) }}</p>
        </li>
      </ul>
    </li>
  </transition-group>

  <transition name="modal">
    <section v-if="modal" class="modal" @click="modal = false">
      <article class="modal__content" @click.stop>
        <h4 class="modal__title">For the full tutorial</h4>
        <h4 class="modal__title">that goes with this pen</h4>

        <h5 class="modal__link" @click="modal = false">
          <a href="https://snipcart.com/blog/vuejs-transitions-animations" target="_blank">
            Creating Vue.js Transitions &amp; Animations
          </a>
        </h5>

        <button class="modal__close" @click="modal = false">&times;</button>
      </article>
    </section>
  </transition>
</main>
            
          
!
            
              .content {
  position: relative;
  font-family: 'Nunito', sans-serif;
  font-weight: 300;
  color: #3d5358;
  max-width: 780px;
  margin: 0 auto;

  &__list {
    position: relative;
    margin-top: 1rem;
    padding-right: 1rem;
    padding-bottom: 5rem;
    backface-visibility: hidden;
  }
}

.company {
  position: relative;
  width: calc(100% / 2 - 1rem);
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  margin-left: 1rem;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-radius: 6px;
  background-color: white;
  box-shadow: 0 0 0 1px #c5d0d1;
  backface-visibility: hidden;
  transform-origin: 10% 50%;
  z-index: 1;

  @media (min-width: 800px) { width: calc(100% / 3 - 1rem) }

  &-move { transition: all 600ms ease-in-out 50ms }
  &-enter-active { transition: all 300ms ease-out }

  &-leave-active {
    transition: all 200ms ease-in;
    position: absolute;
    z-index: 0;
  }

  &-enter,
  &-leave-to { opacity: 0 }
  &-enter { transform: scale(0.9) }

  &__data { line-height: 1.3 }
  &__label { font-size: 0.8rem }
  &__rating { text-align: center }

  &__info {
    padding: 0 0.75rem;
    text-align: center;
  }

  &__logo {
    width: 3rem;
    height: 3rem;
    margin: 0 auto;
  }

  &__name {
    height: 2.5rem;
    margin: 0.75rem 0;
    font-size: 1.3rem;
    font-weight: 200;
    text-align: center;
  }

  &__slogan {
    height: 2rem;
    text-align: center;
    font-weight: 400;
    text-transform: capitalize;
  }

  &__details {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
    padding: 0.5rem 0.75rem;
    background-color: rgba(#c5d0d1, 0.1);
    border-top: 1px solid #c5d0d1;
  }

  &__country:hover {
    text-decoration: underline;
    cursor: pointer;
  }
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  white-space: nowrap;
  margin: 0 1rem;
  padding: 2rem 0.5rem 1rem;
  border-bottom: 1px solid #c5d0d1;

  &__controls { display: flex }

  &__icon {
    width: 1rem;
    height: 1rem;
    fill: currentColor;
  }

  &__label {
    position: relative;
    margin-left: 1rem;
    text-transform: capitalize;
    z-index: 1;
    cursor: pointer;

    &::after {
      content: '\00d7';
      display: inline-block;
      color: transparent;
      width: 0.5rem;
      font-weight: 400;
      transform: scale(0);
      transition: transform 150ms ease-in-out;
    }

    &--clear {
      color: #f68185;
      opacity: 0;
      transform: translate3d(-25%, 0, 0);
      pointer-events: none;
      transition: all 275ms ease-in-out;
    }

    &--filter ~ &--clear {
      opacity: 1;
      transform: translate3d(0, 0, 0);
      pointer-events: auto;
    }

    &--filter::after,
    &--active::after { transform: scale(1) }

    &--filter::after {
      content: '\2022';
      color: #46d2c4;
    }

    &--active::after {
      content: '\00d7';
      color: #f68185;
    }
  }
}

.dropdown {
  position: relative;
  height: 0;
  overflow: hidden;
  transition: height 350ms;

  &::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1rem;
    background-image: linear-gradient(to top, white, rgba(white, 0));
  }

  &-enter,
  &-leave-to { opacity: 0 }

  &-leave,
  &-enter-to { opacity: 1 }

  &-enter-active,
  &-leave-active {
    position: absolute;
    width: 100%;
    transition: opacity 200ms ease-in-out;
  }

  &-enter-active { transition-delay: 100ms }
}

.filters {
  padding: 0 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;

  &__item {
    margin-top: 0.5rem;
    margin-right: 0.5rem;
    padding: 0.25rem 0.5rem;
    border: 1px solid #c5d0d1;
    border-radius: 6px;
    font-size: 0.8rem;
    line-height: 1.35;
    cursor: pointer;
    transition: all 275ms;

    &:hover { border-color: #379a93 }

    &--active {
      color: white;
      border-color: #379a93;
      background-color: #379a93;
    }
  }

  &__rating {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem 0;
  }

  &__range {
    width: 200px;
    margin-top: 1rem;
    color: inherit;

    &::-webkit-slider-thumb {
      width: 0.8rem;
      height: 0.8rem;
      margin-top: calc(-0.4rem + 2px);
      border-radius: 100%;
      background-color: currentColor;
    }

    &::-webkit-slider-runnable-track {
      width: 100%;
      height: 4px;
      background-image: linear-gradient(to right, white, #46d2c4);
    }
  }
}

.modal {
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgba(white, 0.6);
  z-index: 1;

  &-enter-active,
  &-leave-active { transition: opacity 350ms }

  &-enter,
  &-leave-to { opacity: 0 }

  &-leave,
  &-enter-to { opacity: 1 }

  &__content {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 90%;
    max-width: 500px;
    min-height: 250px;
    padding: 1.5rem 1rem;
    background-color: white;
    border: 1px solid #c5d0d1;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 0.5rem 1.75rem -0.25rem rgba(#3d5358, 0.4);
  }

  &__title {
    font-weight: 400;
    font-size: 1.5rem;
  }

  &__link {
    margin-top: 1.5rem;
    position: relative;
    font-size: 1.2rem;
    font-weight: 300;
    z-index: 0;

    &::after {
      content: '';
      width: 100%;
      height: 1px;
      position: absolute;
      bottom: 0;
      left: 0;
      background-color: currentColor;
      z-index: -1;
      transition: background-color 225ms ease-out;
    }

    &:hover::after {
      background-color: #46d2c4;
    }
  }

  &__close {
    position: absolute;
    top: 0.25rem;
    right: 1rem;
    font-size: 1.75rem;
    font-weight: 400;
    opacity: 0.5;
    transition: opacity 150ms ease-out;

    &:hover {
      opacity: 1;
    }
  }
}

            
          
!
            
              new Vue({
  el: '#app',
  components: {
    'icon': { template: '<svg><use :xlink:href="use"/></svg>', props: ['use'] }
  },

  data() {
    return {
      modal: false,
      companies: [],
      dropdown: { height: 0 },
      rating: { min: 10, max: 0 },
      filters: { countries: {}, categories: {}, rating: 0 },
      menus: { countries: false, categories: false, rating: false }
    }
  },

  computed: {
    activeMenu() {
      return Object.keys(this.menus).reduce(($$, set, i) => (this.menus[set]) ? i : $$, -1)
    },

    list() {
      let { countries, categories } = this.activeFilters

      return this.companies.filter(({ country, keywords, rating }) => {
        if (rating < this.filters.rating) return false
        if (countries.length && !~countries.indexOf(country)) return false
        return !categories.length || categories.every(cat => ~keywords.indexOf(cat))
      })
    },

    activeFilters() {
      let { countries, categories } = this.filters

      return {
        countries: Object.keys(countries).filter(c => countries[c]),
        categories: Object.keys(categories).filter(c => categories[c]),
        rating: (this.filters.rating > this.rating.min) ? [this.filters.rating] : []
      }
    }
  },

  watch: {
    activeMenu(index, from) {
      if (index === from) return;

      this.$nextTick(() => {
        if (!this.$refs.menu || !this.$refs.menu[index]) {
          this.dropdown.height = 0
        } else {
          this.dropdown.height = `${this.$refs.menu[index].clientHeight + 16}px`
        }
      })
    }
  },

  methods: {
    setFilter(filter, option) {
      if (filter === 'countries') {
        this.filters[filter][option] = !this.filters[filter][option]
      } else {
        setTimeout(() => {
          this.clearFilter(filter, option, this.filters[filter][option])
        }, 100)
      }
    },

    clearFilter(filter, except, active) {
      if (filter === 'rating') {
        this.filters[filter] = this.rating.min
      } else {
        Object.keys(this.filters[filter]).forEach(option => {
          this.filters[filter][option] = except === option && !active
        })
      }
    },

    clearAllFilters() {
      Object.keys(this.filters).forEach(this.clearFilter)
    },

    setMenu(menu, active) {
      Object.keys(this.menus).forEach(tab => {
        this.menus[tab] = !active && tab === menu
      })
    }
  },

  beforeMount() {
    fetch('https://s3-us-west-2.amazonaws.com/s.cdpn.io/450744/mock-data.json')
      .then(response => response.json())
      .then(companies => {
        this.companies = companies

        companies.forEach(({ country, keywords, rating }) => {
          this.$set(this.filters.countries, country, false)

          if (this.rating.max < rating) this.rating.max = rating
          if (this.rating.min > rating) {
            this.rating.min = rating
            this.filters.rating = rating
          }

          keywords.forEach(category => {
            this.$set(this.filters.categories, category, false)
          })
        })
      })
  }
})

// inject svg spritesheet
fetch('https://s3-us-west-2.amazonaws.com/s.cdpn.io/450744/mock-logos.svg')
  .then(response => response.text()).then(sprite => {
    let figure = document.createElement('figure')
    figure.style.display = 'none'
    figure.innerHTML = sprite
    document.body.insertBefore(figure, document.body.children[0])
  })

            
          
!
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