:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #5f5f5f;
  --link: #0b57d0;
  --border: #e2e2e2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --bg: #14161a;
    --muted: #a0a0a0;
    --link: #8ab4f8;
    --border: #2c2f36;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
}

header.site-header a.brand {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
}

nav.site-nav {
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

nav.site-nav a {
  margin-right: 1.25rem;
  color: var(--muted);
  text-decoration: none;
}

nav.site-nav a:hover {
  color: var(--link);
  text-decoration: underline;
}

h1 {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

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

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

footer.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}