:root{font-family:system-ui,-apple-system,Segoe UI,sans-serif;color-scheme:light dark}body{margin:0}.app-shell{max-width:72rem;margin:0 auto;padding:2rem}.login-button{display:inline-block;padding:.6rem 1.2rem;border-radius:.375rem;background:#2563eb;color:#fff;text-decoration:none}button{padding:.5rem 1rem;border-radius:.375rem;border:1px solid #94a3b8;background:transparent;cursor:pointer}