*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:linear-gradient(135deg,#f6f7fb,#eef1f7);color:#1f2937}#root{min-height:100vh;display:flex;align-items:center;justify-content:center}.app-shell{width:100%;padding:24px;display:flex;justify-content:center}.card{width:100%;max-width:420px;background:#fff;border-radius:16px;padding:28px;box-shadow:0 10px 25px #00000014,0 4px 10px #0000000a}.card h1{margin-top:0;margin-bottom:20px;text-align:center}.mode-switch{display:flex;gap:8px;margin-bottom:20px}.mode-switch button{flex:1}.form{display:grid;gap:12px}label{font-size:14px;font-weight:500;display:flex;flex-direction:column;gap:6px}input{margin-top:4px;padding:10px 12px;border-radius:10px;border:1px solid #d1d5db;font-size:14px}input:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 2px #6366f126}button{padding:10px 14px;border-radius:10px;border:none;font-weight:600;font-size:14px;cursor:pointer;background:#6366f1;color:#fff}button:disabled{background:#c7d2fe;cursor:default}button.secondary{background:#e5e7eb;color:#374151}.result{margin-top:16px;padding:14px;border-radius:12px;background:#f9fafb;border:1px solid #e5e7eb;font-size:14px}.error{color:#b91c1c;background:#fee2e2;padding:10px;border-radius:10px;font-size:14px}