struct DocumentDropZone: View {
    @State private var droppedFiles: [URL] = []
    
    var body: some View {
        RoundedRectangle(cornerRadius: 12)
            .fill(Color.gray.opacity(0.2))
            .frame(height: 200)
            .overlay {
                VStack {
                    Image(systemName: "doc.badge.plus")
                    Text("Drop PDF or text files here")
                }
            }
            .dropDestination(for: URL.self) { urls, location in
                let validFiles = urls.filter { url in
                    url.pathExtension.lowercased() == "pdf" ||
                    url.pathExtension.lowercased() == "txt"
                }
                droppedFiles.append(contentsOf: validFiles)
                return !validFiles.isEmpty
            }
    }
}