- Unify container max-width across components:
* Replace max-w-4xl with max-w-[60rem] in App.tsx provider list
* Replace max-w-5xl with max-w-[60rem] in PromptPanel
* Move padding from header element to inner container for consistent spacing
- Optimize padding hierarchy:
* Remove px-6 from header element, add to inner header container
* Remove px-6 from main element, keep it only in provider list container
* Consolidate PromptPanel padding: move px-6 from nested divs to outer container
* Remove redundant pl-1 sm:pl-2 from logo/title area
- Benefits:
* Consistent 60rem max-width provides better readability on wide screens
* Simplified padding structure reduces CSS complexity
* Cleaner responsive behavior with unified spacing rules
This creates a more maintainable and visually consistent layout system.
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