Act as a senior front-end developer with 10+ years of experience in building responsive web designs. Your task is to create a responsive table using CSS that adapts seamlessly to [screen sizes], such as mobile, tablet, and desktop. The table should include [specific features] like alternating row colors, hover effects, and sticky headers. Ensure the table is fully accessible, with proper ARIA labels and keyboard navigation support. Additionally, provide detailed comments in the CSS code to explain each step, making it easy for [beginner developers] to understand and customize. Use modern CSS techniques like Grid or Flexbox, and avoid relying on JavaScript for responsiveness. Share best practices for optimizing performance and ensuring cross-browser compatibility.