:root {
  --ink: #000;
  --paper: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #fff;
    --paper: #000;
  }
}

* {
  box-sizing: border-box;
  border-radius: 0;
}

body {
  max-width: 36rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
  background: var(--paper);
  color: var(--ink);
  font: 1rem/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

h1 {
  margin: 0 0 2.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--ink);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

section {
  margin-bottom: 2rem;
  border: 1px solid var(--ink);
}

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

section li + li {
  border-top: 1px solid var(--ink);
}

section a {
  display: block;
  padding: 0.6rem 0.75rem;
  text-decoration: none;
}

a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

a:hover,
a:focus {
  background: var(--ink);
  color: var(--paper);
  outline: none;
}

nav {
  margin-bottom: 2.5rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

article h1 {
  margin-bottom: 2rem;
  border: 0;
  padding: 0;
  font-size: 1.5rem;
  letter-spacing: 0;
  text-transform: none;
}

article h2,
article h3 {
  margin: 2.5rem 0 0.75rem;
  border: 0;
  padding: 0;
  font-size: 1rem;
  letter-spacing: 0;
  text-transform: none;
}

article p {
  margin: 0 0 1.25rem;
}

article blockquote {
  margin: 1.5rem 0;
  padding-left: 1rem;
  border-left: 1px solid var(--ink);
}

article hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--ink);
}

article code,
article pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875em;
}

article pre {
  overflow-x: auto;
  padding: 0.75rem;
  border: 1px solid var(--ink);
}

article img {
  max-width: 100%;
  height: auto;
}