Hiro-Setsuya/Weather_Update ? reverse-engineered prompt

Build me a clean, responsive weather app that lets a user search for any city and instantly see the current weather. It should show the temperature in Celsius, what the weather is like, a short description, feels like temperature, humidity, wind speed, and the country with a flag emoji. I also want weather icons that match the current conditions, and the page should look good on both mobile and desktop.

Use the OpenWeatherMap API for the data, and make the interface simple and easy to use. If you need to look up the current API details or best practices online, go ahead. Please wire up the HTML, CSS, and JavaScript so the app works smoothly, handles bad city names gracefully, and feels polished enough to use right away.