*:focus {
  outline: 0.125rem solid #f00;
}

body {
  font-family: sans-serif;
  margin: 0;
  padding: 3rem;
}

header {
  margin-bottom: 3rem;
}

h1,
h2 {
  font-family: Georgia, serif;
  font-style: italic;
  font-weight: normal;
  margin: 0 0 1.5rem 0;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 1.75rem;
}

p {
  font-family: Georgia, serif;
  font-size: 1.125rem;
  line-height: 1.7;
  margin: 1.5em 0;
}

a {
  color: #c00;

  &:focus,
  &:hover {
    color: #f00;
  }
}

nav {
  background: #efefef;
  border-radius: 3px;
  margin: 0;
  padding: 2rem;

  ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  li + li {
    margin-top: 0.5rem;
  }

  a {
    display: inline-block;
    margin: 0 -0.5rem;
    padding: 0.25rem 0.5rem;
  }
}

aria-collapsible {
  [control]:not([hidden]) {
    background: #efefef;
    border: 0;
    border-radius: 3px;
    color: #333;
    cursor: pointer;
    display: inline-block;
    font: inherit;
    font-weight: bold;
    padding: 0.5rem 1rem;
  }

  [control][aria-expanded="true"]:not([hidden]) {
    background: #333;
    color: #efefef;
  }

  [region] {
    margin-top: 1rem;
  }
}