body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;max-width:900px;margin:40px auto;padding:0 16px;line-height:1.45}
header{margin-bottom:28px}
nav a{margin-right:14px}
.tagline{color:#444}
.callout{border:1px solid #ddd;padding:14px 16px;border-radius:10px}
.note{color:#444;margin-top:18px;font-size:0.95em}
footer{margin-top:44px;color:#666;font-size:0.9em}
a{color:inherit}