graph TD A[User Input: Niche Topic] --> B{Niche Researcher} B --> |JSON: Keywords, Trends| C{Slogan Generator} C --> |JSON: Top 6 Slogans| D{Image Creator} D --> |6 AI-generated Images| E{Layout Designer} E --> |6 Birthday Card Designs| F{Quality Controller} F --> |Approved Images| G{Output Manager} G --> |Zipped Images, HTML Selector| H[User Output]