h1 {
  margin-top: 0;
  margin-bottom: .875rem;
  color: var(--xm-c-deeper);
  font-weight: 800;
  font-size: 2.25rem;
  line-height: 1.15;
}

h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--xm-c-deep);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1.35;
  code {
    font-size: .875rem;
  }
  + * {
    margin-top: 0;
  }
}

h3 {
  margin-top: 1.6rem;
  margin-bottom: .6rem;
  color: inherit;
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.6;
  opacity: .7;
  code {
    font-size: .9rem;
  }
  + * {
    margin-top: 0;
  }
}

h4 {
  margin-top: 1.5rem;
  margin-bottom: .5rem;
  color: inherit;
  font-weight: 600;
  line-height: 1.5;
  + * {
    margin-top: 0;
  }
}

h5,
h6 {
  margin-top: 20px;
  margin-bottom: 10px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: .5;
}

hr {
  width: 50px;
  margin-top: 2rem;
  margin-bottom: 2rem;
  border-color: var(--xm-c-hr-border);
  + * {
    margin-top: 0;
  }
}

.header-anchor {
  float: left;
  margin-top: 0;
  margin-left: -1.25rem;
  padding-right: .5rem;
  border: 0 !important;
  font-weight: 600;
  font-size: inherit;
  text-decoration: none;
  opacity: 0;
  &:hover,
  &:focus {
    text-decoration: none;
  }
}

@for $i from 1 through 6 {
  h#{$i} {
    &:hover,
    &:focus {
      .header-anchor {
        opacity: .35 + $i * .025;
      }
    }
  }
}