.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#2c3e50,#34495e);padding:20px}.login-card{background:#fff;border-radius:16px;box-shadow:0 10px 40px #0003;width:100%;max-width:450px;overflow:hidden;animation:slideUp .5s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.login-header{background:linear-gradient(135deg,#ff6b00,#ff8c00);color:#fff;padding:40px 30px;text-align:center}.login-logo{width:120px;height:auto;margin-bottom:20px;filter:brightness(0) invert(1)}.login-header h1{font-size:1.8rem;margin-bottom:8px}.login-header p{font-size:.95rem;opacity:.9}.login-form{padding:40px 30px}.form-group{margin-bottom:24px}.form-group label{display:block;font-weight:600;color:#2d3748;margin-bottom:8px;font-size:.95rem}.form-group input{width:100%;padding:12px 16px;border:2px solid #e2e8f0;border-radius:8px;font-size:1rem;transition:all .3s;outline:none}.form-group input:focus{border-color:#ff6b00;box-shadow:0 0 0 3px #ff6b001a}.form-group input:disabled{background-color:#f7fafc;cursor:not-allowed}.error-message{background-color:#fee;color:#c53030;padding:12px 16px;border-radius:8px;margin-bottom:20px;font-size:.9rem;border-left:4px solid #c53030}.login-button{width:100%;padding:14px;background:linear-gradient(135deg,#ff6b00,#ff8c00);color:#fff;border:none;border-radius:8px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s;display:flex;align-items:center;justify-content:center;gap:10px}.login-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #ff6b004d}.login-button:active:not(:disabled){transform:translateY(0)}.login-button:disabled{opacity:.7;cursor:not-allowed}.spinner-small{width:20px;height:20px;border:3px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}.login-footer{background-color:#f7fafc;padding:20px 30px;text-align:center;border-top:1px solid #e2e8f0}.login-footer p{color:#718096;font-size:.85rem;margin:5px 0}.login-footer .security-info{color:#6c757d;font-weight:600;display:flex;align-items:center;justify-content:center;gap:5px;margin-bottom:10px}.login-info{text-align:center;margin-bottom:30px;padding:20px;background:linear-gradient(135deg,#fff3e0,#ffe0b2);border-radius:8px;border-left:4px solid #FF6B00}.login-info p{margin:5px 0;color:#2d3748;font-weight:600}.login-info .info-text{font-weight:400;font-size:.9rem;color:#555}.login-footer-actions{margin-top:15px;text-align:center}.forgot-password-link{background:none;border:none;color:#ff6b00;cursor:pointer;font-size:.9rem;text-decoration:underline;padding:5px;transition:all .3s ease}.forgot-password-link:hover{color:#ff8c00}.forgot-password-link:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 480px){.login-card{max-width:100%}.login-header{padding:30px 20px}.login-header h1{font-size:1.5rem}.login-form{padding:30px 20px}.login-logo{width:100px}}.excel-uploader{width:100%;height:100%;display:flex;flex-direction:column;gap:20px}.upload-area{border:3px dashed #cbd5e0;border-radius:8px;padding:30px 20px;background-color:#fff;transition:all .3s ease;cursor:pointer;min-height:250px;display:flex;align-items:center;justify-content:center}.upload-area:hover{border-color:#ff6b00;background-color:#fff5ed;box-shadow:0 2px 8px #ff6b0026}.upload-label{display:flex;flex-direction:column;align-items:center;gap:15px;cursor:pointer;color:#4a5568}.upload-icon{width:64px;height:64px;color:#ff6b00}.upload-label h3{font-size:1.2rem;color:#2d3748;margin:0}.upload-label p{font-size:.9rem;color:#718096;margin:0}.file-name{margin-top:10px;padding:10px 20px;background-color:#fff5ed;color:#ff6b00;border-radius:8px;font-weight:500;font-size:.95rem}.loading{display:flex;flex-direction:column;align-items:center;gap:15px}.spinner{width:50px;height:50px;border:4px solid #e2e8f0;border-top-color:#ff6b00;border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading p{color:#ff6b00;font-weight:500;font-size:1.1rem}.upload-instructions{background:#fff;padding:20px;border-radius:8px;font-size:.9rem;color:#4a5568}.upload-instructions h4{font-size:1rem;color:#2d3748;margin-bottom:10px}.upload-instructions ul{margin:10px 0;padding-left:20px}.upload-instructions li{margin:5px 0}@media (max-width: 768px){.upload-area{padding:20px 15px;min-height:200px}.upload-icon{width:48px;height:48px}.upload-label h3{font-size:1rem}}.html-preview{height:100%;display:flex;flex-direction:column;background:#fff}.preview-header{background:linear-gradient(135deg,#ff6b00,#ff8c00);color:#fff;padding:15px 20px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;flex-shrink:0}.preview-header h2{font-size:1.2rem;margin:0}.controls{display:flex;gap:10px;flex-wrap:wrap}.view-toggle{display:flex;background:#fff3;border-radius:8px;overflow:hidden}.view-toggle button{padding:8px 16px;border:none;background:transparent;color:#fff;cursor:pointer;font-size:.85rem;transition:background-color .3s;font-weight:500}.view-toggle button:hover{background:#ffffff1a}.view-toggle button.active{background:#ffffff4d}.btn-download,.btn-copy{padding:8px 16px;border:2px solid white;background:transparent;color:#fff;border-radius:6px;cursor:pointer;font-size:.85rem;font-weight:500;transition:all .3s}.btn-download:hover,.btn-copy:hover{background:#fff;color:#ff6b00;transform:translateY(-2px)}.preview-content{flex:1;background:#f7fafc;overflow:hidden;display:flex;flex-direction:column}.preview-iframe{width:100%;height:100%;border:none;background:#fff;flex:1}.code-preview{margin:0;padding:20px;background:#1e293b;color:#e2e8f0;overflow:auto;height:100%;flex:1;font-family:Courier New,Courier,monospace;font-size:.85rem;line-height:1.5}.code-preview code{display:block;white-space:pre}@media (max-width: 1024px){.preview-header{padding:15px}.preview-header h2{font-size:1.1rem}}@media (max-width: 768px){.preview-header{flex-direction:column;align-items:flex-start;padding:15px}.preview-header h2{font-size:1rem}.controls{width:100%;flex-direction:column}.view-toggle,.btn-download,.btn-copy{width:100%}.view-toggle button{flex:1}.code-preview{padding:15px;font-size:.75rem}}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{padding:20px;background:linear-gradient(135deg,#ff6b00,#ff8c00);color:#fff;box-shadow:0 2px 4px #0000001a;position:relative;z-index:10;flex-shrink:0}.header-content{display:flex;justify-content:space-between;align-items:center;max-width:1600px;margin:0 auto;gap:20px}.app-header h1{font-size:2rem;margin-bottom:5px}.app-header p{font-size:1rem;opacity:.9}.header-actions{display:flex;align-items:center;gap:15px}.username{font-size:.95rem;font-weight:500;padding:8px 16px;background:#fff3;border-radius:20px}.logout-button{padding:8px 20px;background:#fff3;color:#fff;border:2px solid white;border-radius:6px;cursor:pointer;font-size:.9rem;font-weight:600;transition:all .3s}.logout-button:hover{background:#fff;color:#ff6b00}.app-main{flex:1;display:grid;grid-template-columns:400px 1fr;gap:0;overflow:hidden;min-height:0}.upload-section{background:#f8f9fa;padding:20px;border-right:2px solid #dee2e6;overflow-y:auto;height:100%}.preview-section{background:#fff;overflow-y:auto;animation:fadeIn .5s ease-in;height:100%}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@media (max-width: 1024px){.app-main{grid-template-columns:1fr;grid-template-rows:auto 1fr;height:auto}.upload-section{border-right:none;border-bottom:2px solid #dee2e6;max-height:40vh}.preview-section{min-height:60vh}.header-content{flex-direction:column;align-items:flex-start}.header-actions{width:100%;justify-content:space-between}}@media (max-width: 768px){.app-header h1{font-size:1.5rem}.app-header p{font-size:.9rem}.username{font-size:.85rem;padding:6px 12px}.logout-button{padding:6px 16px;font-size:.85rem}}*{margin:0;padding:0;box-sizing:border-box}body{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;background-color:#f5f5f5}#root{min-height:100vh}