:root {
  color-scheme: dark;
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-secondary: #8b949e;
  --accent: #2ea043;
  --max-width: 720px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP",
    "Hiragino Sans", sans-serif;
  line-height: 1.7;
  font-size: 15px;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 48px;
}

header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.3;
}

.updated {
  margin: 0;
  color: var(--text-secondary);
  font-size: 13px;
}

h2 {
  margin: 32px 0 12px;
  font-size: 18px;
  line-height: 1.4;
}

p,
li {
  color: var(--text);
}

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

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

nav.links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}

nav.links a {
  text-decoration: none;
}

nav.links a:hover {
  text-decoration: underline;
}