:root {
  --max-width: 760px;
  --color-bg: #ffffff;
  --color-text: #222222;
  --color-muted: #666666;
  --color-accent: #2b5cab;
  --color-border: #e3e3e3;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0 20px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.9;
  font-size: 16px;
}

header.site-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 0 24px;
}

header.site-header h1 {
  font-size: 1.5rem;
  margin: 0 0 4px;
}

header.site-header p.tagline {
  color: var(--color-muted);
  margin: 0;
  font-size: 0.95rem;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 8px 0 40px;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2.2em;
  margin-bottom: 0.6em;
  border-left: 4px solid var(--color-accent);
  padding-left: 10px;
}

h3 {
  font-size: 1rem;
  margin-top: 1.6em;
  margin-bottom: 0.4em;
}

p, li {
  font-size: 0.98rem;
}

ul, ol {
  padding-left: 1.4em;
}

a {
  color: var(--color-accent);
  text-decoration: underline;
}

a:hover {
  text-decoration: none;
}

.card-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 24px 0;
}

.card-links a {
  display: inline-block;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.95rem;
}

.card-links a:hover {
  background: #f5f7fa;
}

section.en-summary {
  margin-top: 3em;
  padding-top: 1.4em;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.9rem;
}

section.en-summary h2 {
  border-left-color: var(--color-muted);
  color: var(--color-muted);
  font-size: 1rem;
}

.revision {
  color: var(--color-muted);
  font-size: 0.9rem;
}

footer.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 0 48px;
  border-top: 1px solid var(--color-border);
  font-size: 0.85rem;
  color: var(--color-muted);
}

footer.site-footer nav a {
  margin-right: 16px;
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  header.site-header {
    padding-top: 32px;
  }
}