:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#1f2937;background-color:#f9fafb}body{margin:0}.container{margin:0 auto;max-width:720px;padding:2rem 1rem}nav a{color:#2563eb;text-decoration:none}nav a:hover{text-decoration:underline}