body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.container{display:flex;flex-direction:column;gap:1rem;justify-content:center;align-items:center;padding:20px}.card{background:#fff;border-radius:8px;box-shadow:0 4px 6px #0000001a;padding:2rem;max-width:600px;width:100%}h2{color:#333;margin-bottom:1rem;text-align:center}p{color:#666;margin-bottom:2rem;text-align:center}fieldset{border:1px solid #ddd;border-radius:4px;padding:1rem;margin-bottom:1rem;display:flex;justify-content:space-between}button{background-color:#007bff;color:#fff;border:none;padding:12px 24px;font-size:16px;border-radius:4px;cursor:pointer;transition:background-color .3s ease;width:100%;margin-bottom:1rem}button:hover:not(:disabled){background-color:#0056b3}button:disabled{background-color:#6c757d;cursor:not-allowed}button.loading{position:relative}button.loading:after{content:"";position:absolute;right:12px;top:50%;transform:translateY(-50%);width:16px;height:16px;border:2px solid transparent;border-top:2px solid white;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:translateY(-50%) rotate(0)}to{transform:translateY(-50%) rotate(360deg)}}.message{padding:12px;border-radius:4px;margin-bottom:1rem;font-size:14px}.message.success{background-color:#d4edda;border:1px solid #c3e6cb;color:#155724}.message.error{background-color:#f8d7da;border:1px solid #f5c6cb;color:#721c24}.App{text-align:center;min-height:100vh;background-color:#f5f5f5}.nav-tabs{display:flex;justify-content:center;gap:8px;padding:16px;border-bottom:1px solid #d8d8d8;background:#f8f8f8}.nav-tab{display:inline-block;padding:10px 16px;text-decoration:none;font-weight:600;color:#6c757d}.nav-tab:hover{color:#333}.nav-tab-active{border-bottom:2px solid #007bff;color:#333}