:root {
  --bg: #f3f4f7;
  --surface: #ffffff;
  --text: #1a1d23;
  --muted: #5b6270;
  --border: #d6dae2;
  --accent: #2b4acb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161c;
    --surface: #1c1f27;
    --text: #e7eaf0;
    --muted: #9aa3b2;
    --border: #333947;
    --accent: #8fb0ff;
  }
}

body {
  max-width: 48rem;
  margin: 2rem auto;
  padding: 0 1rem;
  color: var(--text);
  background: var(--bg);
  font:
    16px/1.75 ui-sans-serif, system-ui, "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", sans-serif;
}

main {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  background: var(--surface);
}

h1,
h2 {
  line-height: 1.35;
}

h2 {
  border-top: 1px solid var(--border);
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  font-size: 1.1rem;
}

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

code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--bg);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}