:root {
            --primary-color: #3498db;
            --primary-dark: #2980b9;
            --secondary-color: #2c3e50;
            --success-color: #27ae60;
            --warning-color: #f39c12;
            --danger-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #34495e;
            --gray-color: #95a5a6;
            --white: #ffffff;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            padding: 20px;
            line-height: 1.6;
            background-color: #f8f9fa;
            color: var(--secondary-color);
            height: 100%;
            overflow-y: auto;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            body {
                padding: 10px;
            }
            
            .container {
                padding: 20px 15px;
            }
            
            h1 {
                font-size: 24px;
                margin-bottom: 20px;
            }
            
            .btn {
                padding: 10px 16px;
                font-size: 14px;
            }
            
            .batch-input-section {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            
            .generated-barcodes {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
                gap: 15px;
            }
            
            .control-panel {
                flex-direction: column;
                gap: 15px;
                align-items: flex-start;
            }
        }
        
        @media (max-width: 480px) {
            body {
                padding: 8px;
            }
            
            .container {
                padding: 15px 10px;
            }
            
            .generated-barcodes {
                grid-template-columns: 1fr;
            }
            
            .btn-group {
                flex-direction: column;
                align-items: stretch;
            }
            
            .btn {
                width: 100%;
                justify-content: center;
            }
            
            .mode-toggle {
                flex-direction: column;
            }
            
            .batch-stats {
                flex-direction: column;
                gap: 10px;
            }
        }
        
        h1 {
            color: var(--secondary-color);
            text-align: center;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 3px solid var(--primary-color);
            font-weight: 700;
            font-size: 28px;
        }
        
        .container {
            background-color: var(--white);
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: var(--box-shadow);
            margin-bottom: 30px;
        }
        
        .section-title {
            color: var(--secondary-color);
            margin-bottom: 20px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
        }
        
        .section-title i {
            color: var(--primary-color);
        }
        
        .input-group {
            margin-bottom: 25px;
        }
        
        .input-label {
            display: block;
            margin-bottom: 10px;
            font-weight: 600;
            color: var(--secondary-color);
            font-size: 16px;
        }
        
        textarea, input[type="number"], select, input[type="text"] {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 6px;
            box-sizing: border-box;
            font-family: 'Consolas', monospace;
            font-size: 14px;
            transition: var(--transition);
            background-color: var(--white);
        }
        
        textarea:focus, input[type="number"]:focus, select:focus, input[type="text"]:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        
        textarea {
            height: 120px;
            resize: vertical;
            min-height: 80px;
        }
        
        .btn {
            background-color: var(--primary-color);
            color: var(--white);
            border: none;
            padding: 12px 24px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 600;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            white-space: nowrap;
        }
        
        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
        }
        
        .btn:disabled {
            background-color: var(--gray-color);
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .btn-success {
            background-color: var(--success-color);
        }
        
        .btn-success:hover {
            background-color: #219653;
        }
        
        .btn-warning {
            background-color: var(--warning-color);
        }
        
        .btn-warning:hover {
            background-color: #e67e22;
        }
        
        .btn-danger {
            background-color: var(--danger-color);
        }
        
        .btn-danger:hover {
            background-color: #c0392b;
        }
        
        .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 20px;
        }
        
        .mode-toggle {
            display: flex;
            background-color: var(--light-color);
            border-radius: var(--border-radius);
            padding: 5px;
            margin-bottom: 30px;
            overflow: hidden;
        }
        
        .mode-btn {
            flex: 1;
            text-align: center;
            padding: 12px;
            cursor: pointer;
            border-radius: 6px;
            font-weight: 600;
            transition: var(--transition);
            border: none;
            background: transparent;
            color: var(--secondary-color);
        }
        
        .mode-btn:hover {
            background-color: rgba(52, 152, 219, 0.1);
        }
        
        .mode-btn.active {
            background-color: var(--primary-color);
            color: var(--white);
        }
        
        .output {
            margin-top: 30px;
            padding: 25px;
            background-color: var(--white);
            border-radius: var(--border-radius);
            border: 1px solid #e0e0e0;
        }
        
        .barcode-container {
            display: inline-block;
            margin: 15px;
            text-align: center;
            vertical-align: top;
            padding: 20px;
            background-color: var(--white);
            border-radius: var(--border-radius);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            border: 1px solid #eee;
            width: 100%;
            max-width: 300px;
        }
        
        .barcode-container:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
        }
        
        .barcode-canvas {
            border: 1px solid #eee;
            max-width: 100%;
            display: block;
            margin: 0 auto 10px;
            border-radius: 4px;
            background-color: var(--white);
        }
        
        .barcode-text {
            font-size: 13px;
            word-break: break-all;
            max-width: 100%;
            margin-top: 10px;
            padding: 10px;
            background-color: #f8f9fa;
            border-radius: 4px;
            font-family: 'Consolas', monospace;
            text-align: left;
            line-height: 1.5;
            overflow-wrap: break-word;
        }
        
        .barcode-index {
            background-color: var(--primary-color);
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 10px;
            font-weight: bold;
            font-size: 14px;
        }
        
        .download-options {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 20px;
            align-items: center;
        }
        
        .format-option {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .info-box {
            background-color: #eaf2f8;
            padding: 25px;
            border-radius: var(--border-radius);
            margin-top: 30px;
            border-left: 5px solid var(--primary-color);
        }
        
        .alert {
            margin-top: 15px;
            padding: 15px;
            border-radius: 6px;
            border-left: 5px solid transparent;
            display: none;
            animation: fadeIn 0.3s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .alert-error {
            background-color: #ffe6e6;
            border-left-color: var(--danger-color);
            color: var(--danger-color);
        }
        
        .alert-success {
            background-color: #eafaf1;
            border-left-color: var(--success-color);
            color: var(--success-color);
        }
        
        .alert-info {
            background-color: #eaf2f8;
            border-left-color: var(--primary-color);
            color: var(--primary-color);
        }
        
        .batch-input-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 25px;
        }
        
        .file-upload-area {
            border: 2px dashed #ddd;
            border-radius: var(--border-radius);
            padding: 40px 20px;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            background-color: #fafafa;
        }
        
        .file-upload-area:hover {
            border-color: var(--primary-color);
            background-color: #f0f7ff;
        }
        
        .file-upload-area.dragover {
            border-color: var(--primary-color);
            background-color: #e8f4fc;
        }
        
        .file-upload-area i {
            font-size: 48px;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        
        .file-upload-text {
            font-size: 16px;
            margin-bottom: 10px;
            color: var(--secondary-color);
        }
        
        .file-upload-subtext {
            font-size: 14px;
            color: var(--gray-color);
        }
        
        #fileInput {
            display: none;
        }
        
        .batch-list {
            max-height: 300px;
            overflow-y: auto;
            border: 1px solid #e0e0e0;
            padding: 15px;
            margin-bottom: 15px;
            border-radius: var(--border-radius);
            background-color: var(--white);
        }
        
        .batch-item {
            display: flex;
            justify-content: space-between;
            padding: 12px 15px;
            border-bottom: 1px solid #eee;
            align-items: center;
            transition: var(--transition);
        }
        
        .batch-item:hover {
            background-color: #f8f9fa;
        }
        
        .batch-item:last-child {
            border-bottom: none;
        }
        
        .batch-item-controls {
            display: flex;
            gap: 10px;
        }
        
        .batch-item-control {
            background: none;
            border: none;
            cursor: pointer;
            font-size: 14px;
            color: var(--gray-color);
            transition: var(--transition);
            padding: 5px;
            border-radius: 4px;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .batch-item-control:hover {
            background-color: #f0f0f0;
        }
        
        .batch-item-control.delete:hover {
            color: var(--danger-color);
            background-color: #ffe6e6;
        }
        
        .batch-item-control.edit:hover {
            color: var(--primary-color);
            background-color: #eaf2f8;
        }
        
        .batch-stats {
            display: flex;
            justify-content: space-between;
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: var(--border-radius);
            margin-bottom: 20px;
            font-size: 14px;
        }
        
        .stat-item {
            text-align: center;
            flex: 1;
        }
        
        .stat-value {
            font-size: 24px;
            font-weight: bold;
            color: var(--primary-color);
        }
        
        .stat-label {
            color: var(--gray-color);
            font-size: 13px;
        }
        
        .generated-barcodes {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }
        
        .loading {
            display: none;
            text-align: center;
            padding: 40px;
            color: var(--primary-color);
            font-size: 16px;
        }
        
        .loading i {
            font-size: 36px;
            margin-bottom: 15px;
        }
        
        .data-flow {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin: 25px 0;
        }
        
        @media (max-width: 768px) {
            .data-flow {
                gap: 15px;
            }
        }
        
        .flow-step {
            background-color: var(--white);
            padding: 20px;
            border-radius: var(--border-radius);
            border: 1px solid #e0e0e0;
            position: relative;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        
        @media (max-width: 768px) {
            .flow-step {
                padding: 15px;
            }
            
            .flow-step:before {
                display: none;
            }
        }
        
        .flow-step:before {
            content: "→";
            position: absolute;
            left: -25px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary-color);
            font-size: 24px;
            font-weight: bold;
        }
        
        .flow-step:first-child:before {
            content: "";
        }
        
        .step-number {
            display: inline-flex;
            background-color: var(--primary-color);
            color: white;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            text-align: center;
            align-items: center;
            justify-content: center;
            margin-right: 12px;
            font-weight: bold;
            font-size: 14px;
        }
        
        .step-title {
            font-weight: 600;
            color: var(--secondary-color);
            margin-bottom: 15px;
            font-size: 17px;
            display: flex;
            align-items: center;
        }
        
        .preview-box {
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: 6px;
            margin: 10px 0;
            border-left: 4px solid var(--primary-color);
            font-family: 'Consolas', monospace;
            font-size: 13px;
            overflow-x: auto;
            word-break: break-all;
        }
        
        .input-example {
            font-size: 13px;
            color: var(--gray-color);
            margin-top: 8px;
            font-style: italic;
            line-height: 1.5;
        }
        
        .special-chars {
            display: inline-block;
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: bold;
            margin: 0 3px;
            font-size: 12px;
        }
        
        .fnc1 {
            background-color: #ffe6e6;
            color: var(--danger-color);
        }
        
        .gs {
            background-color: #e8f5e9;
            color: var(--success-color);
        }
        
        .control-panel {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .export-options {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
        }
        
        .export-format {
            display: flex;
            align-items: center;
            gap: 5px;
            padding: 8px 12px;
            background-color: #f8f9fa;
            border-radius: 6px;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
        }
        
        .export-format:hover {
            background-color: #e9ecef;
            border-color: #ddd;
        }
        
        .export-format.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: var(--gray-color);
            width: 100%;
        }
        
        .empty-state i {
            font-size: 64px;
            margin-bottom: 20px;
            color: #ddd;
        }
        
        .empty-state h3 {
            margin-bottom: 10px;
            color: var(--secondary-color);
            font-size: 20px;
        }
        
        .progress-bar {
            height: 8px;
            background-color: #e0e0e0;
            border-radius: 4px;
            overflow: hidden;
            margin-bottom: 15px;
            width: 100%;
            max-width: 400px;
            margin: 0 auto 15px;
        }
        
        .progress-fill {
            height: 100%;
            background-color: var(--primary-color);
            width: 0%;
            transition: width 0.5s ease;
        }
        
        .progress-text {
            text-align: center;
            font-size: 14px;
            color: var(--gray-color);
            margin-bottom: 20px;
        }
        
        .barcode-actions {
            display: flex;
            gap: 8px;
            margin-top: 10px;
            justify-content: center;
        }
        
        .barcode-action-btn {
            background: none;
            border: 1px solid #ddd;
            border-radius: 4px;
            padding: 5px 10px;
            font-size: 12px;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 4px;
        }
        
        .barcode-action-btn:hover {
            background-color: #f8f9fa;
            border-color: var(--primary-color);
        }
        
        .barcode-action-btn.download:hover {
            color: var(--success-color);
            border-color: var(--success-color);
        }
        
        .barcode-action-btn.delete:hover {
            color: var(--danger-color);
            border-color: var(--danger-color);
        }
        
        .batch-controls {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }
        
        .divider {
            height: 1px;
            background-color: #e0e0e0;
            margin: 25px 0;
            width: 100%;
        }
        
        .info-icon {
            color: var(--primary-color);
            margin-right: 8px;
        }
        
        .tooltip {
            position: relative;
            display: inline-block;
        }
        
        .tooltip .tooltip-text {
            visibility: hidden;
            width: 200px;
            background-color: var(--dark-color);
            color: var(--white);
            text-align: center;
            border-radius: 6px;
            padding: 8px;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -100px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 12px;
            font-weight: normal;
        }
        
        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }