:root {
  color-scheme: light dark;
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #555;
  --link: #0b57d0;
  --border: #e0e0e0;
  --card: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #eee;
    --muted: #aaa;
    --link: #8ab4f8;
    --border: #333;
    --card: #1e1e1e;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    'Helvetica Neue',
    Arial,
    'Noto Sans JP',
    sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

header {
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
}

.meta {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0;
}

.lang-switch {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}

.lang-switch a {
  margin-right: 0.75rem;
}

section {
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.05rem;
  font-weight: 650;
  margin: 1.25rem 0 0.5rem;
}

p,
li {
  margin: 0.5rem 0;
}

ul {
  padding-left: 1.25rem;
}

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

.note {
  font-size: 0.875rem;
  color: var(--muted);
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.card-nav {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.card-nav ul {
  margin: 0.25rem 0 0;
}

.card-nav li {
  margin: 0.35rem 0;
}