:root { --primary: #004080; --bg: #fafafa; }
body { font-family: -apple-system, "Segoe UI", Roboto, sans-serif; margin: 0; background: var(--bg); color: #333; }
header { background: var(--primary); color: #fff; padding: 12px 24px; display: flex; justify-content: space-between; align-items: center; }
header a { color: #fff; text-decoration: none; margin-left: 16px; }
main { max-width: 1100px; margin: 24px auto; padding: 0 16px; }