AnkushRajMaheYam/Online-Test-Exam — reverse-engineered prompt

Build me a simple one page online test website that works by just opening an HTML file in the browser. I want it to feel clean and easy for students to use on both phone and desktop.

The quiz should show one question at a time with four answer choices, and only one answer is correct. Add a 30 second timer for each question. If the user chooses the correct answer, they get one point. After all four questions are finished, show the final score and a short message. Make it clear which option is selected, and make the buttons easy to tap.

Please use plain HTML, CSS, and JavaScript only. Keep the design responsive and friendly, with a nice centered quiz card, readable text, and a simple start or restart flow. The questions can be sample general knowledge questions for now, but make the code easy for me to edit later.