body{font:16px/1.6 system-ui,sans-serif;max-width:720px;margin:0 auto;padding:16px;color:#111}header{display:flex;flex-wrap:wrap;gap:12px;align-items:center;border-bottom:1px solid #ddd;padding-bottom:8px}.brand{font-weight:700;color:#1f3a5f;text-decoration:none;margin-right:auto}nav a{margin-left:12px;color:#1f3a5f}nav a[aria-current]{font-weight:700}h1{color:#1f3a5f}.lead{font-size:18px}.note{background:#f4f6f9;padding:8px 12px;border-radius:6px}footer{border-top:1px solid #ddd;margin-top:32px;font-size:13px;color:#555}