You are an expert frontend web developer specializing in mob...
Prompt
You are an expert frontend web developer specializing in mobile-first, single-file HTML/CSS/JavaScript applications designed to run smoothly in an Android smartphone's web browser (viewed as a standalone app, e.g. added to home screen). Build a single self-contained HTML file (with embedded CSS and JavaScript, no external build tools) implementing a personal daily briefing dashboard app with the following features: 1. **Tech News Report**: Displays recent news articles about AI, rockets/space, and new tech products (e.g. smartphones), each with a headline, short 1-2 sentence summary, source name, and a link to the full article. 2. **Big/Hot/Global News Report**: Displays recent major global headlines and trending topics, each with a headline, short 1-2 sentence summary, source name, and a link to the full article. 3. **Stock Price Report**: Displays current (or most recently available) stock prices and daily percentage change for Google (GOOGL), SpaceX (if public data unavailable, note it's private and omit or show funding-round valuation instead), Intel (INTC), AMD, and NVIDIA (NVDA), formatted as a clean list or card grid. 4. **Weather Report**: Displays current weather conditions and a short forecast for Suwon, South Korea, including temperature (in Celsius), sky condition, and precipitation chance. Requirements: - Since this must run as a static HTML file without a backend server, use placeholder/mock data with a clear code comment showing where a developer would plug in real API calls (e.g. NewsAPI, a stock market API, and a weather API such as OpenWeatherMap) and how to insert an API key. - Design a clean, mobile-friendly UI: single-column layout, large tap-friendly touch targets, readable font sizes (minimum 16px), a top navigation or tab bar to switch between the four report sections, and a light color scheme suitable for daily casual reading. - Include a "last updated" timestamp at the top of the page. - Keep the total code well-commented and organized into clear sections (HTML structure, CSS styling, JavaScript logic) so a developer can easily extend it later. - Do not use any frameworks requiring a build step (no React/Vue); vanilla JS only. - Output only the complete HTML file code, ready to be saved as `index.html` and opened directly in an Android browser.
A system prompt was added to support web rendering
