:root {
  --bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --link: #2563eb;
  --border: #e5e7eb;
  --section-bg: #ffffff;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.8;
  color: var(--text);
  background: var(--bg);
}

.content {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 24px;
}

.site-header {
  margin-bottom: 56px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.site-header h1 {
  margin: 0 0 16px;
  font-size: 28px;
  line-height: 1.4;
}

.header-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.header-nav a {
  color: var(--muted);
  text-decoration: none;
}

.header-nav a:hover {
  color: var(--link);
}

.section {
  margin-bottom: 56px;
}

.section h2 {
  font-size: 28px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.section h3 {
  font-size: 18px;
  margin-top: 32px;
  margin-bottom: 8px;
}

ul {
  padding-left: 1.5em;
}

li {
  margin-bottom: 8px;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px;
  color: var(--muted);
  font-size: 14px;
  border-top: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --text: #eeeeee;
    --muted: #aaaaaa;
    --link: #93c5fd;
    --border: #333333;
    --section-bg: #111111;
  }
}