intermediateladka/ecotec ? reverse-engineered prompt

Build me a polished Flask website for ECOTECH SERVICES that looks modern and works well on mobile.

It should have a public homepage, services page, about page, contact form, and an internship portal with 11 internship options like full stack, frontend, backend, Python, Java, mobile app, UI UX, cybersecurity, IoT, AI and machine learning, and data science. People should be able to register, log in, apply for an internship, upload a resume, and then see their application status and history in a personal dashboard.

I also need a secure admin area with its own login, where I can view applications, filter them, update statuses, download resumes, and see basic stats and charts. When an application is approved, the system should automatically generate a professional offer letter that the user can download.

Please make it secure with proper form validation, CSRF protection, file upload checks, and clean session handling. Use a dark Bootstrap style, keep the code organized, and if you need current docs for anything, look them up online.