graph TD A[Input: base-url] --> B[Build HTML Instructions Prompt] B --> C[Generate Email Template] C --> D[Quality Control Check] D --> E[Final HTML Output] B --> B1[Specify Friendly Tone] B --> B2[Define Responsive Layout] B --> B3[Set Placeholder Variables] B --> B4[Configure CTA Button] B --> B5[Set Inline CSS Rules] C --> C1[Apply Template Writing Skill 190] C --> C2[Create Table-Based Layout] C --> C3[Insert Placeholders] C --> C4[Style CTA Button] D --> D1[Validate Placeholders] D --> D2[Check HTML Structure] D --> D3[Optimize Whitespace] E --> E1[Save as reminder_email.html] E --> E2[UTF-8 Encoding] E --> E3[CRLF Line Endings]