CSS *is* awesome
summary
Demos show concrete wins not promises: using :has parent selector to turn a label red when an input is invalid, toggle a hidden field when a radio is checked, dim sibling grid items on hover, and build a tabs component — all CSS only and visibly working. container queries adjust styles at 45ch and 90ch so a card component reshapes inside different layouts. Live site and code are linked so the examples can be inspected: pure CSS tab and card components.
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