One responsive build that works on every screen. Fluid type scales, container queries, and WCAG 2.1 AA compliance from day one. Core Web Vitals land green at launch.
The old playbook is obsolete: three fixed breakpoints, a mobile menu, images that shrink between sizes. Modern CSS moved past that.
Fluid type scales with clamp scale smoothly from phone to desktop without breakpoints. Container queries size components to their parent, not the viewport. Logical properties handle RTL automatically. Mobile-first media queries match Google's indexing model.
One build, every viewport. 320px phone to 4K monitor. No mobile-only subdomain. No separate desktop version. No pages that break between sizes.
clamp() and container queries, not three breakpoints and pray.clamp).Typography scales smoothly between a minimum and maximum size without viewport-width breakpoints. font-size: clamp(1rem, 0.5rem + 2vw, 1.5rem) produces continuous type that reads at every size.
Components respond to their parent's width, not the viewport. A product card at 320px wide in a mobile sidebar and 800px wide in a feature strip uses the same component with different layouts. MDN reference.
Default styles target the smallest screen; @media (min-width) progressively enhances for larger screens. Matches Google's mobile-first indexing model and is structurally easier to maintain than desktop-down.
margin-inline-start, padding-block-end instead of margin-left, padding-bottom. The layout flips correctly for right-to-left languages without rewriting CSS. Critical for international expansion.
srcset, AVIF, lazy loading).<picture> with AVIF + WebP + JPG fallbacks, srcset for resolution variants, explicit width/height to prevent layout shift, loading="lazy" below the fold.
Grid replaces float- and flex-based hacks for 2D layouts. Subgrid (shipped in every browser by 2023) aligns nested grids to a parent's tracks, solving the "cards that line up across columns" problem cleanly.
Performance and accessibility are validated at every milestone, not retrofitted after launch.
We use PageSpeed Insights for Core Web Vitals, WAVE for accessibility, and axe DevTools in CI on every PR.
Performance and accessibility are build-time gates. Core Web Vitals (LCP under 2.5s, CLS under 0.1, INP under 200ms) and WCAG 2.1 AA must pass or the code doesn't ship.
Every pull request runs through a performance budget and accessibility lint. The Website Audit tool, Color Contrast Checker, and Heading Outliner are the same ones we use internally.
A responsive build can be the entire site, a single page, or a retrofit of an existing desktop-first template. The right shape depends on the gap between current and target, not the size of your brand.
We turn down full rebuilds when a retrofit is cheaper, faster, and just as effective.
2 weeks. One responsive page or major section. Proof-of-build before a larger rebuild, or one-off campaign page that has to load fast on mobile.
6-10 weeks. Complete rebuild on modern responsive architecture. Right when the existing site predates container queries or Core Web Vitals is structurally broken at the build layer.
3-5 weeks. Make an existing desktop-first site work on mobile without rebuild. Right when content and brand work but CSS predates 2020. Cheapest path to mobile-first indexing without losing SEO equity.
Mobile-first is not a preference. It matches Google's mobile-first indexing. The mobile rendering is what Googlebot crawls first.
Start with the 320-414px viewport. Layer progressive enhancement up through tablet and desktop.
Desktop-first design shrinks poorly for mobile. Mobile-first forces the right constraints.
If navigation works on a 320px screen, desktop is trivial. If your hero loads in 2.5 seconds on throttled Android, everything else is faster.
Design files in Figma at 360px and 768px before any desktop frame. Forces decisions about which content is essential and which is enhancement.
Each component built as a standalone unit with container-query rules. Stored in Storybook for review. The site composes from the library, not the other way around.
A budget of total JS (≤200 KB), total CSS (≤80 KB), hero image (≤200 KB AVIF), and font payload (≤50 KB subset). Pull requests that exceed the budget fail CI.
Every page tested on real iPhone SE (smallest still-shipping iOS), iPad, low-end Android, MacBook 13″, and ultrawide via BrowserStack. Throttled 4G profile required to pass.
Final pass through PageSpeed Insights, WAVE, and axe-core. Pages that fail any of LCP/CLS/INP or WCAG AA do not deploy.
Six failure modes show up repeatedly: fixed-width components, pixel-based type, mobile-only navigation, tap targets under 44px, forms that break on mobile, and tables that overflow.
Each one is caught in the build phase, not the QA phase. Caught early, it costs nothing. Caught after launch, it costs a redesign.
Hard-coded widths in pixels (320px, 1200px) break the moment the parent shrinks. Use percentages, fluid units, or container queries instead.
A dropdown that opens on hover is invisible on touch devices. Every hover behaviour needs a tap-equivalent or it does not exist on mobile.
WCAG 2.5.5 minimum is 44px; we recommend 48px. Buttons smaller than this fail accessibility AND lose conversion on mobile from accidental missed taps.
Missing width and height attributes cause layout shift as images load. Single largest source of CLS failures. Set both attributes always.
A horizontal menu of 8 items has nowhere to go on a 360px screen. Plan the mobile nav before the desktop one; never as an afterthought.
Embedded videos and animations need a parent with explicit aspect-ratio (16/9). Without it, the iframe collapses or jumps. CLS killer.
The questions teams ask most before booking a responsive redesign: breakpoint strategy, container queries vs media queries, accessibility scope, performance budget, testing devices, and pricing.
Responsive web design means a single codebase that adapts to every screen size and device. No separate mobile and desktop versions. No mobile-only subdomain.
In 2026 the baseline has moved past the old three-breakpoint model. Modern responsive design uses fluid type scales (CSS clamp), container queries (component-level responsiveness independent of viewport), logical properties (for LTR/RTL), and mobile-first media queries that progressively enhance for larger screens.
One build serves a 320px phone, a 1920px monitor, a 3840px TV, and everything in between.
Reason one: Mobile traffic exceeded desktop traffic in 2019 for most ecommerce categories and has stayed there. Designing for desktop-first optimizes for the minority.
Reason two: Google switched to mobile-first indexing in 2021. The mobile version of your site is what Google crawls and ranks. A site that is desktop-fast but mobile-slow loses ranking.
Mobile-first enforces the right constraint: if the small screen works, the big screen is easy. The reverse is not true.
Container queries let a component respond to the width of its parent container, not the viewport.
A card component at 400px wide in a sidebar looks different from the same card at 800px wide in a feature section. No viewport media query involved. This unlocks real component reuse across layouts.
Container queries are the biggest responsive-design shift since CSS Grid. All modern browsers support them natively. We use them by default on every project since mid-2024.
Four discipline points baked into the build.
One: Images in AVIF or WebP with width and height attributes set. Lazy loading below the fold (kills CLS and LCP).
Two: Fonts served with font-display: swap, subset to only Latin or Latin+Cyrillic if applicable.
Three: Critical CSS inlined for the first paint. Rest loaded asynchronously.
Four: Third-party scripts (analytics, chat widgets, Klaviyo) deferred or loaded after interaction.
Core Web Vitals targets (LCP under 2.5s, CLS under 0.1, INP under 200ms) are a build-time check, not a post-launch optimization pass.
WCAG 2.1 AA is baked in, not audited after. Requirements include:
Color contrast: 4.5:1 for normal text, 3:1 for large text and UI. Tap targets: 48 by 48 pixels minimum. Heading order preserved. Visible focus indicators on every interactive element. Form labels programmatically associated. Alt text on every non-decorative image. Skip-to-content link.
These are requirements of the build, not upgrades.
Landing or section: 2 weeks. Single responsive page or major site section.
Full responsive rebuild: 6 to 10 weeks depending on page count and component complexity.
Responsive retrofit: 3 to 5 weeks. Making an existing desktop-first site responsive without full rebuild. This is the right call when the underlying CMS and content architecture are already sound.
Mobile-first, accessibility-first, and Core Web Vitals budgeted from day one. Written scope and fixed-price quote within 48 hours.
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115 people across five studios in New York, Delhi, London, Sydney and Lucknow, shipping ecommerce, web, software and mobile work for founder-led brands. Senior engineers only, no account-manager relay, and the same team from kickoff to launch.
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