:root {
  color-scheme: light dark;
  --canvas: #f5f6fa;
  --surface: #ffffff;
  --ink: #131a33;
  --muted: #7c85a3;
  --line: #c9d3ec;
  --primary: #22407f;
  --link: #3a63c9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #0b1022;
    --surface: #131a33;
    --ink: #eef1fa;
    --muted: #aab2cb;
    --line: #303a5d;
    --primary: #9ab1ef;
    --link: #b7c8f5;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main,
header,
footer {
  width: min(760px, calc(100% - 40px));
  margin-inline: auto;
}

header {
  padding: 56px 0 24px;
}

main {
  padding: 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
}

footer {
  padding: 24px 0 56px;
  color: var(--muted);
  font-size: 14px;
}

h1,
h2 {
  line-height: 1.2;
}

h1 {
  margin: 0 0 8px;
}

h2 {
  margin-top: 32px;
}

p,
li {
  max-width: 68ch;
}

a {
  color: var(--link);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 16px;
}

.subtitle {
  color: var(--muted);
  margin: 0;
}