Responsive design has moved beyond simple media queries. Modern CSS provides powerful tools for creating truly adaptive layouts.

Container Queries: Unlike media queries that respond to viewport size, container queries respond to parent container size. This makes component-based responsive design much cleaner.

CSS Clamp(): The clamp() function combines min, ideal, and max values: font-size: clamp(1rem, 2.5vw, 2rem). This creates fluid typography that scales smoothly without breakpoints.

Grid Auto-Fill: grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)) creates responsive grids without any media queries.

Modern Approach: Use mobile-first design as a starting point, leverage container queries for component-level responsiveness, use clamp() for fluid values, and reserve media queries for major layout changes only.

These techniques reduce CSS complexity while creating more maintainable, truly responsive interfaces.