<div class="css-slider">
  <input type="radio" name="slider-navigation" checked="checked" id="first-slide" />
  <input type="radio" name="slider-navigation" id="second-slide" />
  <input type="radio" name="slider-navigation" id="third-slide" />
  <div class="css-slider-navigation">
    <label class="css-slider-navigation-item" for="first-slide"></label>
    <label class="css-slider-navigation-item" for="second-slide"></label>
    <label class="css-slider-navigation-item" for="third-slide"></label>
  </div>
  <div class="css-slider-wrapper">
    <div class="css-slider-inner">
      <div id="actual-first-slide" class="css-slider-item" style="background-image: url(http://nathan-peixoto-web.yo.fr/stock-photos/01.jpg);">
        <div class="css-slider-item-inner">
          <div class="slide-title">
            Hello
          </div>
          <div class="slide-subtitle">
            How are you?
          </div>
        </div>
      </div>
      <div id="actual-second-slide" class="css-slider-item" style="background-image: url(http://nathan-peixoto-web.yo.fr/stock-photos/02.jpg);">
        <div class="css-slider-item-inner">
          <div class="slide-title">
            Nice to meet you
          </div>
          <div class="slide-subtitle">
            I'm a slider without JS.
          </div>
        </div>
      </div>
      <div id="actual-third-slide" class="css-slider-item" style="background-image: url(http://nathan-peixoto-web.yo.fr/stock-photos/03.jpg);">
        <div class="css-slider-item-inner">
          <div class="slide-title">
            Feel free to use me
          </div>
          <div class="slide-subtitle">
            Don't be shy
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

body{
  margin: 0;
}

$slider-movement-duration: 500ms;
$step-wait: 250ms;
$slide-animation-duration: 500ms;
$animation-total-duration: $slider-movement-duration + $step-wait + $slide-animation-duration;

.css-slider{
  position: relative;
  width: 100vw;
  height: 100vh;
  .css-slider-navigation{
    z-index: 2;
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    .css-slider-navigation-item{
      cursor: pointer;
      position: relative;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: black;
      display: inline-block;
      &:active,
      &:hover,
      &:focus{
        background: gray;
      }
    }
  }
  @for $j from 1 to 10{
    input[type=radio]:nth-of-type(#{$j}):checked{
      ~ .css-slider-navigation{
        .css-slider-navigation-item:nth-child(#{$j}){
          background: gray;
        }
      }
      ~ .css-slider-wrapper{
        .css-slider-inner{
          transform: translateX(- 100% * ($j - 1));
          .css-slider-item:nth-child(#{$j}){
            transition-delay: $animation-total-duration;
            left: 0;
            top: 0;
            margin-right: 0;
            width: 100%;
            height: 100%;
            .css-slider-item-inner{
              *{
                top: 0;
                opacity: 1;
                @for $k from 0 to 10{
                  &:nth-child(#{$k}){
                    transition-delay: $animation-total-duration + (100ms * ($k - 1));
                    transition-duration: 500ms - 100ms * ($k - 1);
                  }
                }
              }
            }
          }
        }
      }
    }
  }
  .css-slider-wrapper{
    z-index: 1;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    .css-slider-inner{
      position: relative;
      white-space: nowrap;
      height: 100%;
      transform: translateX(0);
      transition: transform $slider-movement-duration ease;
      transition-delay: $slide-animation-duration + $step-wait;
      font-size: 0;
      text-shadow: 0 0 15px black; 
      .css-slider-item{
        position: relative;
        $space: 40px;
        display: inline-block;
        vertical-align: top;
        font-size: initial;
        color: white;
        left: $space;
        top: $space;
        margin-right: 2 * $space;
        width: calc(100% - 2 * #{$space});
        transition-delay: 0;
        height: calc(100% - 2 * #{$space});
        background-size: cover;
        background-position: center;
        transition: margin-right 500ms ease, top 500ms ease, left 500ms ease, width 500ms ease, height 500ms ease, transform 500ms ease, opacity 500ms ease;
        transition-duration: $slide-animation-duration;
        .css-slider-item-inner{
          position: absolute;
          left: 0;
          width: 100%;
          text-align: center;
          top: 50%;
          transform: translateY(-50%);
          *{
            position: relative;
            top: -50px;
            opacity: 0;
            transition: opacity 500ms ease, top 500ms ease;
            @for $k from 0 to 10{
              &:nth-child(#{$k}){
                transition-delay: 100ms * ($k - 1);
                transition-duration: 500ms - 100ms * ($k - 1);
              }
            }
          }
        }
      }
    }
  }
}

.slide-title{
  font-size: 42px;
  font-family: "Open Sans";
  font-weight: 100;
  text-transform: uppercase;
}
.slide-subtitle{
  font-size: 24px;
  font-style: italic;
}

input[type=radio]{
  display: none;
}

@keyframes fade{
  0%{
    opacity: 1;
  }
  50%{
    opacity: 0;
  }
  100%{
    opacity: 1;
  }
}