WEB DEVLOPEMENT #1902

Media queries are definitely an important part of responsive design, but I wouldn't rely on them alone.

A good modern approach is to build the layout mobile-first and combine several techniques:

• CSS media queries for layout changes at different viewport sizes.
• Flexbox and CSS Grid for flexible layouts instead of fixed widths.
• Relative units such as %, rem, em, and vw instead of relying heavily on px.
• Fluid typography and spacing, for example using clamp().
• Responsive images using max-width: 100% and, when needed, srcset/picture.
• Container queries when a component needs to respond to the size of its parent rather than the entire viewport.

For example, instead of creating separate desktop and mobile versions of a page, I usually start with the mobile layout and progressively enhance it:

.container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 768px) {
    .container {
        grid-template-columns: repeat(2, 1fr);
    }
}

So I would say media queries are still essential, but the bigger idea is to create fluid and flexible layouts that naturally adapt, and then use media/container queries when a specific layout change is actually needed.

For someone learning responsive design, I'd focus first on Flexbox → Grid → mobile-first design → media queries → fluid sizing → container queries.