7min.scss

$colours: #F6D258 #EFCEC5 #D1AF94 #97D5E0 #88B14B #EF562D #D13076 #5587A2 #5C7148 #0C4C8A #7539A9 #FF954D;

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #333;
  color: #FFF;
  font-size: 16px;
  font-family: 'Oswald', 'Helvetica', 'sans-serif';
}

* {
  box-sizing: border-box;
}

.animate {
  .stage:before {
    animation: progress 40s linear;
    animation-fill-mode: forwards;
  }
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 100;
  display: none;
  flex-direction: column;
  width: 100%;
  height: 100%;
  background: rgba(#333, 0.8);
  text-align: center;
  font-size: 150px;
  padding: 10px;
  cursor: pointer;

  align-items: center;
  justify-content: center;

  &.on {
    display: flex;
  }

  h1 {
    font-size: 56px;
  }

  p {
    font-size: 30px;
  }
}

.content {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.stages {
  display: flex;
  flex: 1;
  width: 100%;
  height: 100%;

  flex-flow: row wrap;

  .stage {
    position: relative;
    display: flex;
    padding: 5px;
    text-align: center;
    transition: 0.5s all;

    align-items: center;
    justify-content: space-around;

    &:before {
      position: absolute;
      top: 0;
      left: 0;
      display: block;
      width: 0;
      height: 100%;
      background: rgba(0, 0, 0, 0.3);
      content: '';
    }

    .stage-title {
      position: relative;
      z-index: 10;
      font-size: 34px;
    }

    .icons {
      z-index: 10;
      display: flex;

      .fa {
        position: relative;
        padding: 0 5px;
        opacity: 0.3;

        &.on {
          opacity: 1;
        }
      }
    }

    .counter {
      position: relative;
      height: 1em;
      line-height: 1em;
      z-index: 10;
    }

    @media only screen and (min-width: 769px) {
      flex-direction: column;
      width: 12.5%;
      height: 50%;
      font-size: 28px;

      &.active {
        width: 62.5%;
        .stage-title, .icons, .counter {
          font-size: 60px;
        }
      }

      .stage-title, .icons {
        padding: 0 5px 10px;
      }

      .counter {
        font-size: 44px;
      }
    }

    @media only screen and (max-width: 768px) {
      flex-direction: row;
      width: 100%;
      height: initial;
      font-size: 19px;
      justify-content: space-between;

      .wrap {
        display: flex;
        padding-right: 5px;
      }

      .stage-title, .icons {
        padding: 0 5px;
      }

      .stage-title {
        font-size: 24px;
      }
    }

    @each $colour in $colours {
      $i: index($colours, $colour);

      &.stage-#{$i} {
        background-color: $colour;

        &:before {
          animation-delay: #{40 * $i - 40}s;
        }
      }
    }
  }
}

.info {
  display: flex;
  height: 36px;
  background: #333;

  align-items: center;

  h3 {
    flex: 1;
    margin: 0;
    padding-left: 10px;
    font-size: 18px;
  }

  .buttons {
    display: flex;
    padding-right: 5px;
    width: 100px;

    justify-content: flex-end;

    i {
      padding: 0 10px;
      font-size: 26px;

      &:hover {
        color: lightgrey;
        cursor: pointer;
      }
    }

    a {
      color: #FFF;
      text-decoration: none;
      line-height: 1em;
    }
  }
}

@keyframes progress {
  0% {
    width: 0;
  }

  75% {
    background-color: rgba(0,0,0,0.5);
  }

  76% {
    background-color: rgba(red, 0.5);
  }

  99% {
    background-color: rgba(red, 0.5);
  }

  100% {
    width: 100%;
    background-color: rgba(green, 0.75);
  }
}