- Add proper header-container with max-width and centering
- Implement mobile hamburger navigation that opens as dropdown
- Keep navigation links on left side with logo on desktop
- Add mobile navigation JavaScript with auto-close functionality
- Improve mobile typography and spacing for 768px and 480px breakpoints
- Position mobile navigation absolutely below header with shadow
- Include header.css in base template
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Co-Authored-By: Claude <noreply@anthropic.com>