Subgrid articles and design guides

Subgrid quietly fixed one of CSS Grid's oldest headaches: getting nested elements to line up with the parent's tracks. Now that browser support finally landed across the board, the pattern is fair game for production. Articles filed here show where subgrid earns its place: card grids with aligned footers, complex forms, editorial layouts where baseline alignment used to mean magic numbers. We keep the examples concrete and the fallbacks honest. Front-end developers who already know Grid and want the next layer will get the most out of this. It's a small feature that removes a lot of hacks.