What are the key considerations for environment variables in a Cloudflare Pages Next.js App Router project?

Cloudflare Pages handles environment variables through its dashboard. You need to define them there. For Next.js App Router, these variables are accessed using `process.env`. Important: Cloudflare Pages supports secrets, which are encrypted. Use secrets for sensitive information like API keys. Remember to restart your deployment after adding or modifying environment variables for the changes to take effect. Also, consider using a `.env.local` file for local development, but *never* commit it to your repository.