:root{color:#1f2937;background:#f3f4f6;font-family:system-ui,sans-serif}body{box-sizing:border-box;place-items:center;min-height:100vh;margin:0;padding:1rem;display:grid}.card{background:#fff;border-radius:8px;width:100%;max-width:32rem;padding:2rem;box-shadow:0 1px 3px #00000026}h1{margin-top:0;font-size:1.5rem}.actions{flex-wrap:wrap;gap:.5rem;display:flex}button{color:#fff;cursor:pointer;background:#1d4ed8;border:none;border-radius:6px;padding:.5rem 1rem;font-size:.95rem}button:disabled{opacity:.6;cursor:default}button.secondary{color:#1f2937;background:#e5e7eb}pre{color:#d1fae5;background:#111827;border-radius:6px;margin-top:1rem;padding:1rem;overflow-x:auto}.error{color:#b91c1c}