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The key changes:
Instead of just leaving items as-is, it now creates a proper column structure
All items go into the masonry-col masonry-col-1 div
The column styling is set to width: 100% and float: none for proper single-column layout
Maintains the same structure pattern as the two-column layout
This ensures that on smaller screens, all your masonry items will be properly contained within the masonry-col masonry-col-1 class as requested.