* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  font-size: 24px;
  font-family: serif;
}

header {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 64px;
}

.last-update {
  text-transform: lowercase;
  font-family: sans-serif;
  font-size: 0.75rem;
  margin: 1em;
  color: #aaa;
}

.chapter {
  max-width: 80ch;
  margin-inline: auto;
  padding-inline: 32px;
}

.chapter img {
  max-width: 100%;
  object-fit: contain;
}

.chapter + .chapter {
  margin-top: 256px;
}

h1,
h2,
h3 {
  font-family: sans-serif;
  margin: 2em auto;
}

h2 {
  color: white;
  background-color: black;
  width: fit-content;
  margin: 128px auto;
  text-align: center;
}

a {
  color: tomato;
  text-decoration: none;
}

pre,
code {
  white-space: pre-wrap;
}

.language-note,
.language-todo {
  margin: 32px auto;
  font-family: sans-serif;
  display: inline-block;
  width: auto;
  padding: 1ch;
  color: #aaa;
  border: 1px solid #aaa;
  position: relative;
  white-space: pre-wrap;
}

.language-note:before,
.language-todo:before {
  padding: 0.1ch;
  position: absolute;
  top: 0;
  translate: calc(-1ch + -1px) -100%;
  display: inline-block;
  background-color: #aaa;
  color: white;
}

.language-note:before {
  content: "Note";
}

.language-todo:before {
  content: "TO DO";
}

.language-placeholder {
  position: relative;
  margin: 48px auto;
  display: flex;
  flex-direction: column;
  border: 1px dashed currentColor;
  justify-content: center;
  align-items: center;
  padding: 32px 32px;
  border-radius: 50%;
  font-family: sans-serif;
  text-align: center;
}

.language-placeholder:before {
  content: "placeholder";
  text-transform: uppercase;
  font-size: 0.8rem;

  color: #aaa;
}

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

  img {
    max-width: 10cm;
    max-height: 10cm;
    object-fit: contain;
  }

  h1,
  h2,
  h3 {
    margin-top: 0;
    margin: 0;
  }

  .chapter {
    max-width: 100%;
  }
  .chapter + .chapter {
    margin-top: 32px;
  }
}