:root {
  color-scheme: light dark;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1a2332;
  --muted: #5c6b7a;
  --accent: #2f6fab;
  --border: #d8e0ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --card: #171d25;
    --text: #e8edf3;
    --muted: #9aa8b8;
    --accent: #6eb0ff;
    --border: #2a3441;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header {
  margin-bottom: 2rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  line-height: 1.2;
}

.lead {
  color: var(--muted);
  margin: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

p, ul {
  margin: 0 0 0.75rem;
}

ul {
  padding-left: 1.25rem;
}

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

nav {
  margin-top: 1.5rem;
  font-size: 0.95rem;
}

nav a {
  margin-right: 1rem;
}

footer {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.875rem;
}