body{font-family:-apple-system,system-ui,Helvetica,Arial,sans-serif;max-width:720px;margin:48px auto;padding:0 20px;line-height:1.6;color:#1d1d1f}
a{color:#0a66c2}nav a{margin-right:16px}h1{font-size:2rem}h2{margin-top:2em}hr{border:0;border-top:1px solid #ddd;margin:3em 0}footer{margin-top:4em;color:#777;font-size:.9rem}