:root {
  --fg: #1c1e21;
  --bg: #ffffff;
  --muted: #5b6168;
  --accent: #2f5fa3;
  --border: #e3e5e8;
}

* { box-sizing: border-box; }

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

header {
  border-bottom: 1px solid var(--border);
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

nav.wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}

.brand {
  font-weight: 600;
  font-size: 18px;
  text-decoration: none;
  color: var(--fg);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
}

nav a:hover, nav a.active {
  color: var(--accent);
}

main.wrap {
  padding-top: 48px;
  padding-bottom: 64px;
  min-height: 50vh;
}

h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

h2 {
  font-size: 22px;
  margin-top: 40px;
}

p.lead {
  color: var(--muted);
  font-size: 18px;
  margin-top: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
}

.card h3 {
  margin-top: 0;
  font-size: 17px;
}

.card p {
  color: var(--muted);
  font-size: 14.5px;
  margin-bottom: 0;
}

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13.5px;
}

footer .wrap {
  padding-top: 20px;
  padding-bottom: 28px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

a.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 15px;
  margin-top: 8px;
}

code {
  background: #f1f2f4;
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 90%;
}