body{font-family:system-ui,sans-serif;max-width:640px;margin:2rem auto;padding:0 1rem;color:#1a1a1a}nav{display:flex;gap:1rem;margin-bottom:2rem;border-bottom:1px solid #ddd;padding-bottom:1rem}nav a{color:#2563eb;text-decoration:none}nav a:hover{text-decoration:underline}form{display:flex;flex-direction:column;gap:.5rem;max-width:300px}