Document checklist
- Preview quality: Page is self-contained and ready to preview or download.
- Layout: Uses a clean header, a seven-day forecast grid, a details section, sources, and a footer.
- Source clarity: Shows the source as the National Weather Service and includes two working source links in the Sources section.
- Interaction: Includes a details toggle button with synced label and visible state, changing between Show details and Hide details.
- Mobile layout: Uses responsive breakpoints at 1000px and 640px; the seven-day grid collapses from seven columns to two columns and then to one column.
- Downloads: The finished work is a self-contained HTML file, which supports previewing and downloading as a single file.