Historically, developers built for desktop screens and squeezed it down for phones later. In 2026, this is a fatal error. You must adopt Mobile-First Web Design.
The Thumb Zone
When holding a smartphone, the user's thumb can only comfortably reach the bottom 40% of the screen. Critical buttons, like "Start Project" or "Add to Cart", must be sticky at the bottom of the viewport, not hidden at the top.
Simplified Navigation
Mobile users are impatient. Replace complex hover-menus with full-screen, easily tappable hamburger menus. Remove large walls of text and replace them with icon-driven, scannable data points.