* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background: #f5f5f5;
            padding: 20px;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 32px;
            margin-bottom: 8px;
        }

        .header p {
            font-size: 14px;
            opacity: 0.9;
        }

        .content {
            display: grid;
            grid-template-columns: 280px 1fr;
            min-height: 600px;
        }

        .sidebar {
            background: #f9fafb;
            border-right: 1px solid #e5e7eb;
            padding: 20px;
            overflow-y: auto;
        }

        .sidebar-section {
            margin-bottom: 20px;
        }

        .sidebar-title {
            font-size: 12px;
            font-weight: 600;
            color: #6b7280;
            text-transform: uppercase;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .barcode-type {
            display: flex;
            align-items: center;
            padding: 12px;
            margin-bottom: 8px;
            background: white;
            border: 2px solid transparent;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.2s;
            font-size: 14px;
            color: #374151;
        }

        .barcode-type:hover {
            background: #f3f4f6;
            border-color: #dc2626;
        }

        .barcode-type.active {
            background: #fecaca;
            border-color: #dc2626;
            color: #7f1d1d;
            font-weight: 600;
        }

        .barcode-type-icon {
            width: 24px;
            height: 24px;
            margin-right: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
        }

        .main {
            padding: 40px;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
        }

        .form-group {
            margin-bottom: 24px;
        }

        .form-label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: #1f2937;
            margin-bottom: 8px;
        }

        .form-input,
        .form-select {
            width: 100%;
            padding: 10px 12px;
            border: 1px solid #d1d5db;
            border-radius: 6px;
            font-size: 14px;
            font-family: inherit;
            transition: border-color 0.2s;
        }

        .form-input:focus,
        .form-select:focus {
            outline: none;
            border-color: #dc2626;
            box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .form-row-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 20px;
        }

        .template-buttons {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 8px;
            margin-bottom: 16px;
        }

        .template-btn {
            padding: 8px 12px;
            background: #f3f4f6;
            border: 1px solid #d1d5db;
            border-radius: 4px;
            font-size: 12px;
            cursor: pointer;
            transition: all 0.2s;
            color: #374151;
        }

        .template-btn:hover {
            background: #e5e7eb;
            border-color: #9ca3af;
        }

        .checkbox-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .checkbox-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .checkbox-item input[type="checkbox"] {
            cursor: pointer;
            width: 16px;
            height: 16px;
        }

        .checkbox-item label {
            cursor: pointer;
            font-size: 14px;
            color: #374151;
        }

        .section-divider {
            border-top: 1px solid #e5e7eb;
            margin: 24px 0;
            padding-top: 24px;
        }

        .preview-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: #fafafa;
            border: 2px dashed #d1d5db;
            border-radius: 8px;
            padding: 40px;
            min-height: 300px;
            margin-top: 24px;
        }

        .preview-label {
            font-size: 12px;
            color: #6b7280;
            text-transform: uppercase;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }

        #barcode {
            max-width: 100%;
            height: auto;
        }

        .button-group {
            display: flex;
            gap: 12px;
            margin-top: 20px;
            justify-content: center;
        }

        button {
            padding: 10px 20px;
            border: none;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
        }

        .btn-primary {
            background: #dc2626;
            color: white;
        }

        .btn-primary:hover {
            background: #b91c1c;
        }

        .btn-secondary {
            background: #e5e7eb;
            color: #374151;
        }

        .btn-secondary:hover {
            background: #d1d5db;
        }

        .error {
            color: #dc2626;
            font-size: 13px;
            margin-top: 6px;
        }

        .info-text {
            font-size: 12px;
            color: #6b7280;
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .content {
                grid-template-columns: 1fr;
            }

            .sidebar {
                border-right: none;
                border-bottom: 1px solid #e5e7eb;
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }

            .sidebar-section {
                margin-bottom: 0;
            }

            .form-row,
            .form-row-3 {
                grid-template-columns: 1fr;
            }

            .main {
                padding: 20px;
            }

            .template-buttons {
                grid-template-columns: 1fr;
            }
        }