body { font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
       margin: 0; color: #222; background: #fafafa; line-height: 1.6; }
header { background: #1f3a5f; color: #fff; padding: 18px 32px; }
header h1 { margin: 0 0 8px; font-size: 1.4em; }
nav a { color: #cfe0f5; text-decoration: none; margin-right: 14px; }
main { max-width: 720px; margin: 32px auto; padding: 0 20px; }
h2 { color: #1f3a5f; }
.muted { color: #777; font-size: 0.9em; }
footer { text-align: center; color: #888; font-size: 0.85em; padding: 24px 0; }