:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --muted: #5f6368;
  --background: #ffffff;
  --link: #0b57d0;
  --rule: #e3e3e3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #ececec;
    --muted: #a8a8a8;
    --background: #161616;
    --link: #8ab4f8;
    --rule: #333333;
  }
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 1.5rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; padding-top: 0.75rem; border-top: 1px solid var(--rule); }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.25rem; }
a { color: var(--link); }
ul, ol { padding-left: 1.4rem; }
li { margin: 0.25rem 0; }
table { border-collapse: collapse; width: 100%; margin: 1rem 0; }
th, td { border: 1px solid var(--rule); padding: 0.4rem 0.6rem; text-align: left; vertical-align: top; }
blockquote { margin: 1rem 0; padding-left: 1rem; border-left: 3px solid var(--rule); color: var(--muted); }