CSS

Writes and debugs CSS: flexbox and grid layout, z-index and stacking, responsive breakpoints, theming, and render performance. Use when a layout breaks or overflows, z-index does nothing, the page scrolls sideways, `position: sticky` won't stick, text won't truncate, styles lose the cascade or need `!important`, content jumps while loading (CLS), transitions stutter, fonts flash, a modal or dropdown sits behind other content, form controls need restyling, a table needs sticky headers, printing comes out wrong, or a style works in Chrome but not Safari. Also for starting a stylesheet from scrat