:root {
  --primary: #1b4f72;
  --text: #1a252f;
  --muted: #5d6d7e;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --border: #dde2e8;
}

* {
  box-sizing: border-box;
}

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

header {
  background: var(--primary);
  color: white;
  padding: 24px 20px;
}

header .wrap {
  max-width: 760px;
  margin: 0 auto;
}

header h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

header p {
  margin: 4px 0 0;
  opacity: 0.85;
  font-size: 14px;
}

main {
  max-width: 760px;
  margin: 24px auto;
  padding: 0 20px 64px;
}

article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

article h2 {
  margin-top: 0;
  font-size: 24px;
  color: var(--primary);
}

article h3 {
  margin-top: 28px;
  font-size: 18px;
}

article p,
article li {
  font-size: 16px;
  color: var(--text);
}

article ul {
  padding-left: 22px;
}

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

nav.links {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

nav.links a {
  display: inline-block;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  color: var(--primary);
}

nav.links a:hover {
  background: var(--primary);
  color: white;
}

footer {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  padding: 24px;
}