:root {
  color-scheme: light;
  --bg: #f7f9fb;
  --text: #16202a;
  --muted: #617080;
  --line: #d8e0e8;
  --accent: #0b67c2;
  --panel: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

.shell,
.document {
  width: min(920px, calc(100% - 32px));
  margin: 48px auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 40px;
}

.eyebrow,
.updated {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 8px;
}

h1 {
  font-size: 34px;
  line-height: 1.15;
  margin: 0 0 16px;
}

h2 {
  border-top: 1px solid var(--line);
  font-size: 20px;
  margin: 28px 0 8px;
  padding-top: 22px;
}

p {
  margin: 0 0 16px;
}

.intro {
  color: var(--muted);
  max-width: 680px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.links a {
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent);
  font-weight: 700;
  padding: 10px 14px;
  text-decoration: none;
}

.back {
  display: inline-block;
  margin-bottom: 24px;
}

@media (max-width: 640px) {
  .shell,
  .document {
    margin: 16px auto;
    padding: 24px;
  }

  h1 {
    font-size: 28px;
  }

  .links {
    display: grid;
  }
}