Refine the existing design to embody a minimalistic aesthetic reminiscent of Google's style, emphasizing a clean, visually appealing layout. Address and rectify the broken comparison links and recommendation pathways that currently lead to error pages, ensuring all internal routes function correctly. Implement a feature to export AI-generated content into a well-formatted PDF document, incorporating metadata such as 'Made by myHerb' and 'Exported using WebInSight.' Enhance the social sharing buttons by dynamically adjusting text sizes to optimize presentation across different social networks, and specifically, structure the LinkedIn sharing option to adhere to the platform's ideal content format.