.file-input-wrapper {
            border: 2px dashed #ddd;
            border-radius: 10px;
            padding: 60px 40px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
            background-color: white;
            min-height: 300px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        
        .file-input-wrapper:hover {
            border-color: #4CAF50;
            background-color: #fafafa;
        }
        
        .file-input-wrapper.dragover {
            border-color: #4CAF50;
            background-color: #e8f5e8;
        }
        
        .file-input {
            display: none;
        }
        
        .file-input-icon {
            width: 80px;
            height: 80px;
            margin-bottom: 20px;
            opacity: 0.5;
        }
        
        .file-input-text {
            font-size: 18px;
            color: #666;
            margin-bottom: 10px;
        }
        
        .file-input-hint {
            font-size: 14px;
            color: #999;
        }
        
        .compression-level {
            display: flex;
            gap: 20px;
            margin-bottom: 15px;
        }
        
        .radio-option {
            display: flex;
            align-items: center;
            cursor: pointer;
        }
        
        .radio-option input[type="radio"] {
            margin-right: 6px;
            cursor: pointer;
        }
        
        .radio-option label {
            cursor: pointer;
            font-size: 14px;
        }
        
        .button-group {
            display: flex;
            gap: 10px;
            margin-bottom: 15px;
        }
        
        .button {
            flex: 1;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 14px;
            cursor: pointer;
            transition: all 0.3s ease;
            background-color: white;
        }
        
        .button:hover {
            border-color: #4CAF50;
            background-color: #fafafa;
        }
        
        .button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
        
        .button.primary {
            background-color: #4CAF50;
            color: white;
            border-color: #4CAF50;
        }
        
        .button.primary:hover {
            background-color: #45a049;
            border-color: #45a049;
        }
        
        .button.secondary {
            background-color: #2196F3;
            color: white;
            border-color: #2196F3;
        }
        
        .button.secondary:hover {
            background-color: #0b7dda;
            border-color: #0b7dda;
        }
        
        .preview-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
        }
        
        .preview-item {
            border: 1px solid #ddd;
            border-radius: 5px;
            padding: 10px;
            background-color: white;
            text-align: center;
        }
        
        .preview-item img {
            max-width: 100%;
            max-height: 150px;
            border-radius: 3px;
            margin-bottom: 8px;
        }
        
        .preview-item-name {
            font-size: 13px;
            font-weight: bold;
            color: #333;
            margin-bottom: 5px;
            word-break: break-all;
        }
        
        .preview-item-info {
            font-size: 12px;
            color: #666;
            margin-bottom: 5px;
        }
        
        .preview-item-status {
            font-size: 11px;
            color: #999;
            margin-top: 5px;
        }
        
        .preview-item-status.processing {
            color: #2196F3;
        }
        
        .preview-item-status.success {
            color: #4CAF50;
        }
        
        .preview-item-status.error {
            color: #f44336;
        }
        
        .download-link {
            display: inline-block;
            padding: 5px 10px;
            background-color: #2196F3;
            color: white;
            text-decoration: none;
            border-radius: 3px;
            font-size: 12px;
            margin-top: 5px;
        }
        
        .download-link:hover {
            background-color: #0b7dda;
        }
        
        .loading {
            text-align: center;
            padding: 15px;
            color: #666;
            border: 1px solid #ddd;
            border-radius: 5px;
            background-color: white;
            margin-bottom: 15px;
        }
        
        .error {
            padding: 10px;
            background-color: #fff5f5;
            color: #c62828;
            border: 1px solid #ffcdd2;
            border-radius: 5px;
            margin-bottom: 15px;
            font-size: 13px;
        }
        
        .file-count {
            text-align: center;
            margin-bottom: 15px;
            font-size: 13px;
            color: #666;
        }
        
        .progress {
            margin-top: 10px;
            font-size: 13px;
            color: #666;
        }
        
        .container .hidden {
            display: none;
        }
        
        .intro-section {
            margin-top: 40px;
            padding: 20px;
            border: 1px solid #ddd;
            border-radius: 5px;
            background-color: white;
        }
        
        .intro-section h2 {
            font-size: 18px;
            color: #333;
            margin-bottom: 15px;
        }
        
        .intro-section p {
            font-size: 14px;
            color: #666;
            line-height: 1.8;
            margin-bottom: 10px;
        }
        
        .intro-section ul {
            font-size: 14px;
            color: #666;
            line-height: 1.8;
            margin-left: 20px;
            margin-bottom: 10px;
        }
        
        .intro-section li {
            margin-bottom: 5px;
        }