CSS Grid is the layout system for two-dimensional layouts (rows AND columns simultaneously). Container: display: grid activates grid layout. grid-template-columns: repeat(3, 1fr) creates 3 equal columns. grid-template-rows sets row heights. gap sets spacing between cells. grid-template-areas names regions for intuitive placement. Items: grid-column: 1 / 3 spans two columns. grid-row: span 2 spans two rows. The fr unit distributes available space proportionally. auto-fit and auto-fill with minmax() create responsive grids without media queries: grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)).
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CSS Grid Complete Guide
Master CSS Grid: two-dimensional layouts, template areas, auto-flow, and responsive grids.
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