:root {
  --ui-font: "Open Sans", "Noto Sans", "Roboto", "Droid Sans", sans-serif;
  --copy-font: "Noto Serif", "Droid Serif", serif;
  --heading-font: Raleway, var(--ui-font);
}

html {
  font-family: var(--copy-font);
  font-size: 5.625vw;
  font-weight: 400;
  word-spacing: -0.05em;

  @media (min-width: 320px) {
    font-size: 18px;
  }

  @media (min-width: 1024px) {
    font-size: 20px;
  }

  @media print {
    font-size: 14px;
  }
}

a {
  color: var(--accent-color);
  opacity: 0.8;
  text-decoration-skip: ink;
  transition: opacity 250ms ease;

  &:hover,
  &:focus {
    opacity: 1;
  }
}

article {
  line-height: 1.75em;

  p,
  ul,
  ol {
    margin-top: 0.5em;
    margin-bottom: 2em;
  }

  li {
    padding-left: 0.25em;
  }
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--heading-font);
  line-height: 1.2em;
  margin-top: 2em;
  margin-bottom: 0;
}

h1 {
  line-height: 1em;
}

h3,
h4,
h5 {
  opacity: 0.8;
}

h6 {
  opacity: 0.67;
}

header h1 {
  font-size: 2em;
  margin-top: 1em;
}

header h1 + h2 {
  font-family: var(--ui-font);
  font-size: 1.2rem;
  font-weight: normal;
  margin-top: 0.25em;
  opacity: 0.5;
}

header h2 {
  font-size: 1.5em;
  margin-bottom: 1em;
}

header h2 + h3 {
  font-family: var(--ui-font);
  font-size: 0.9rem;
  font-weight: normal;
  margin-top: -1.5em;
  margin-bottom: 1em;
  opacity: 0.5;
}

blockquote {
  max-width: var(--content-width);
  margin-left: auto;
  padding-left: 1em;
  margin-right: auto;
  font-style: italic;
  border-left: 0.125em solid var(--accent-color);

  em,
  i {
    font-style: normal;
  }

  aside & {
    font-size: 1.6em;
    line-height: 1.4em;
    border: none;
    margin: 2em auto;
    opacity: 0.8;
    padding: 0 1em;
  }

  .attribution {
    display: block;
    font-size: 0.8em;
    font-style: normal;
    margin-top: -1.5em;

    &:before {
      content: "–";
    }
  }
}

aside {
  margin-bottom: 2em;
}

kbd {
  background-color: rgba(200, 200, 200, 0.15);
  border: 1px solid rgba(0, 0, 0, 0.30);
  border-radius: 0.2em;
  box-shadow:
    inset 0 1px 0 0 rgba(255, 255, 255, 0.12),
    inset 0 -2px 0 0 rgba(0, 0, 0, 0.15);
  display: inline-block;
  font-family: var(--ui-font);
  font-size: 80%;
  line-height: 1.5;
  margin: 0 0.2em;
  min-width: 1em;
  padding: 0.125em 0.5em;
  text-align: center;
  user-select: none;
  white-space: nowrap;
}