:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px}.login-container,.transaction-container{width:100%;max-width:480px;background:#fff;border-radius:16px;padding:40px;box-shadow:0 20px 60px #0000004d;animation:slideUp .5s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}h2{color:#2c3e50;margin-bottom:30px;text-align:center;font-size:28px;font-weight:600}input{width:100%;padding:14px 16px;margin-bottom:16px;border:2px solid #e1e8ed;border-radius:10px;font-size:16px;transition:all .3s ease;background:#f8f9fa;color:#333}input::placeholder{color:#95a5a6}input:focus{outline:none;border-color:#667eea;background:#fff;box-shadow:0 0 0 3px #667eea1a;color:#333}input:disabled{background-color:#ecf0f1;cursor:not-allowed;color:#7f8c8d}button{padding:14px 24px;border:none;border-radius:10px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:8px;color:#fff}button:disabled{opacity:.6;cursor:not-allowed}button:not(:disabled):hover{transform:translateY(-2px);box-shadow:0 10px 20px #0003}.login-btn{width:100%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;margin-top:10px}.logout-btn{background:#e74c3c;color:#fff;padding:8px 16px;font-size:14px}.commit-btn{background:linear-gradient(135deg,#27ae60,#2ecc71);color:#fff;flex:1}.cancel-btn{background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff;flex:1}.clear-btn{background:#95a5a6;color:#fff;margin-top:15px;padding:10px 20px;font-size:14px}.header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.input-group{margin-bottom:30px}.input-group label{display:block;margin-bottom:8px;color:#34495e;font-weight:500;font-size:14px}.button-group{display:flex;gap:15px;margin-bottom:10px}.error-message{color:#e74c3c;background-color:#ffeaea;padding:10px;border-radius:8px;margin-bottom:15px;font-size:14px;text-align:center}.loading{display:flex;align-items:center;gap:8px;color:#fff}.loading:after{content:"";width:16px;height:16px;border:2px solid white;border-radius:50%;border-top-color:transparent;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.demo-credentials{margin-top:20px;padding:15px;background:#f8f9fa;border-radius:10px;border:2px dashed #bdc3c7;text-align:center;font-size:14px;color:#7f8c8d}.demo-credentials p{margin:5px 0}.demo-credentials strong{color:#2c3e50}