:root {
  --bg: #111318;
  --card: #1b2028;
  --text: #e8eaee;
  --muted: #b8c0cc;
  --dim: #7e8794;
  --line: #2a3140;
  --accent: #2f6fed;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

header, main, footer {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 0;
}

header {
  padding-top: 2rem;
}

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

h1 {
  font-size: 1.65rem;
  margin: 0.35rem 0 0.5rem;
}

h2 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.5rem;
}

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

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

nav {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  font-size: 0.95rem;
}

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  margin-top: 1rem;
}

section h2:first-child {
  margin-top: 0;
}

ol, ul {
  padding-left: 1.2rem;
}

footer {
  padding: 2rem 1.25rem 2.5rem;
  color: var(--dim);
  font-size: 0.85rem;
}

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