.button{
  background: $link; border-radius: 3px; display: block; color: white; cursor: pointer; font-weight: 300; padding: 1em 2em; position: relative; text-align: center; vertical-align: top;
  em{ display: block; font-size: 0.6em; font-style: normal; letter-spacing: 0.2em; opacity: 0.5; text-transform: uppercase;}
  strong{ color: inherit;}
  &:hover{ background: $black !important;}
}

.chapters{
  margin-top: 2rem;
  ul{
    font-family: $serif; text-align: left;
    li{
      display: inline;
      a{
        background: $web; border-radius: 3px; color: rgba(white, 0.5); display: block; margin-top: 1rem; padding: 1.25rem 1.5rem 2rem; position: relative;
        &:hover{ background: $black;}
        .fa{ float: right; font-size: 28px;}
        strong{ color: white;}
        > strong{ display: block; font-size: 1.2rem; font-weight: 700;}
        em{
          font-size: $small; display: block; margin-bottom: 1rem;
          strong{ font-style: normal; font-weight: 400;}
        }
        span{
          display: block; font-family: $sans-serif;
          strong{ font-weight: 400;}
        }
      }
      &:nth-child(2) a{ background: $html5;
        &:hover{ background: $black;}
      }
      &:nth-child(3) a{ background: $css3;
        &:hover{ background: $black;}
      }
      &:nth-child(4) a{ background: $sass;
        &:hover{ background: $black;}
      }
    }
  }
  @include on($laptop) {
    ul{
      @include display(flex);
      li{
        @include display(flex); @include flex(3); margin-right: 1px; min-width: 10rem;
        &:nth-child(2){ @include flex(13);}
        &:nth-child(3){ @include flex(29);}
        &:nth-child(4){ @include flex(5); margin-right: 0;}
        a{ @include flex(1); margin: 0;}
      }
    }
  }
}

.content{
  a{ text-decoration: underline;}
  code{ background-color: #222; border-radius: 3px; color: #66d9ef; font-size: $small; padding: 3px 5px 3px; position: relative; top: -1px;}
  > dl{
    background: $background; color: $medium; font-size: $small;
    dt{ font-weight: bold; padding: 1rem; padding-bottom: 0;}
    dd{
      padding: 1rem; padding-top: 0;
      + dt{ border-top: 1px solid white;}
    }
  }
  h3{
    color: $medium; font-size: 1.25rem; font-weight: 700; margin: 1rem 0; padding-top: 2rem; position: relative; top: 1px;
    a{
      font-weight: 400; margin-right: 0.5em; position: absolute; right: 100%; text-decoration: none; top: 2rem;
      &:visited{ color: $blue;}
      &:hover{ color: $blue;}
    }
  }
  h4{ color: $medium; font-size: 1.125rem; font-weight: 700; margin: 2rem 0 1rem;}
  p{
    margin: 1em 0;
    &:first-child{ margin-top: 0;}
    &:last-child{ margin-bottom: 0;}
  }
  pre{ line-height: 1.25; position: relative;}
  ul{
    list-style: disc outside; margin: 1rem 0; padding-left: 1.5em;
    ul{
      list-style-type: circle;
      ul{ list-style-type: square;}
    }
    &.files{ font-family: $monospace;}
    &.software{
      @include clear(); list-style: none; padding-left: 0; text-align: center;
      li{ float: left; margin-bottom: 1rem; width: 50%;
        img{ max-height: 64px;}
        strong{ display: block; line-height: 1; margin-top: 5px;}
        @include on($laptop) {
          margin: 0; width: 20%;
        }
      }
    }
  }
  div.highlight{
    margin: 2rem -2rem; overflow: auto;
    pre code{
      @include label(); background: inherit; color: inherit; display: block; padding: 2rem; top: 0;
      &.language-html{ @include label("HTML", $html5, white);}
      &.language-css{ @include label("CSS", $css3, white);}
      &.language-scss{
        @include label("SCSS", $sass, white);
        &.language-css{ @include label("SCSS CSS", $sass, white);}
      }
    }
    @include on($laptop) {
      margin: 2rem 0;
    }
  }
  .answer,
  .important,
  .info{ background: rgba($blue, 0.1); border-left: 0.25em solid $blue; color: rgba(black, 0.5); font-size: $small; padding: 1rem;}
  .answer{
    background: rgba($green, 0.1); border-left-color: $green;
    .question{
      color: $dark; display: block; font-weight: bold;
      + br{ display: none;}
    }
  }
  .important{ background: rgba($red, 0.1); border-left-color: $red;}
  .result{
    @include label("Result"); border: 1px solid $yellow; color: black; margin: 2rem 0; padding: 1rem;
    &:before{ top: -1rem;}
  }
  @include on($laptop) {
    dl,
    p,
    ol,
    ul{ max-width: 50%;}
  }
  .table{
    margin: 2rem -2rem; overflow: auto;
    table{
      background: $background; border-radius: 3px; font-size: $small; width: 100%;
      th,
      td{ border-top: 1px solid $lighter; color: $medium; padding: 0.5em 1em; vertical-align: top;
        &.empty{ background: white; border-top: none;}
        &.no{ color: $red;}
        &.yes span{ background: $green; color: white; padding: 2px 5px;}
      }
      th{
        background: $light-yellow; border-top-color: $yellow; color: $dark-yellow; font-weight: 400; text-align: left; white-space: nowrap;
        strong{ display: block;}
      }
      tr:nth-child(2n){ background: #fafafa;}
      code{ display: inline-block; margin-bottom: 5px; vertical-align: top;}
      pre{ margin: 0; padding: 0;
        &:before{ display: none;}
      }
    }
    @include on($laptop) {
      margin: 2rem 0;
    }
  }
}

.dots{ @include overlay(); position: fixed; text-align: center;}

.fa{ font-size: 14px; vertical-align: top;}

.footnotes{
  border: 1px solid $lighter; border-width: 1px 0; color: $light; font-size: 0.8em; margin-top: 2rem; padding: 1rem 0;
  li:hover{ color: $medium;}
  a{ color: inherit;}
  em{ color: inherit;}
}

.heading{
  line-height: 1.125; margin-bottom: 2rem;
  img{ margin-bottom: 2rem; max-width: 160px;}
  h1{ color: $dark; font-size: 1.2rem; font-style: italic; font-weight: 400; letter-spacing: -0.04em; position: relative;
    em{ font-style: normal; opacity: 0.5;}
    &.type{ @include replace(url("/images/marksheet-type.png"), 41px, 217px); margin: 0 auto;}
    @include on($laptop) {
      padding-top: 5px;
    }
  }
  h2{
    color: $black; font-size: 2.4rem; font-weight: 700; letter-spacing: -0.04em; margin-top: 1rem;
    &.tagline{ @include replace(url("/images/marksheet-tagline.png"), 25px, 323px); background-size: 100%; margin: 1rem auto 2rem; max-width: 100%;}
    @include on($laptop) {
      margin-top: 2rem;
      &.tagline{ background-size: 323px 25px;}
    }
  }
  @include on($laptop) {
    max-width: 50%;
  }
}

.hello{
  height: 20px; opacity: 0; position: relative;
  .like,
  .tweet{
    color: white; display: inline-block; height: 20px; font-size: 12px; line-height: 20px; margin: 0 0.5rem; position: absolute; top: 0; vertical-align: top;
  }
  .like{ left: 50%;}
  .tweet{ right: 50%;}
}

.intro{
  font-size: 1.2rem;
  strong{ display: block;}
}

.pagination{
  margin-top: 2rem;
  a{ @extend .button;}
  @include on($laptop) {
    width: 21rem;
  }
}

.table-of-contents{
  @include label("Table of Contents"); background: $background; font-size: $small; line-height: 1.25; margin: 3rem 0 2rem; padding: 0.75rem 1rem 0.75rem 1.5rem; position: relative;
  &:before{ background: $light; color: white; top: -1rem;}
  ul{ list-style: disc outside;}
  li{ margin: 1em;}
  a:visited{ color: $light;}
  a:hover{ text-decoration: underline;}
  @include on($laptop) {
    float: right; margin: 0 0 2rem 2rem; max-width: 20rem; min-width: 12rem;
  }
}