Over 60% of web traffic is mobile. Designing desktop-first and shrinking down doesn't work.
Touch Target Sizes
Minimum 44x44px for all tappable elements. Add padding around small icons to increase hit area.
Thumb Zones
Place primary actions in the bottom third of the screen — the natural reach zone for one-handed use.
Mobile Navigation
Hamburger menus hide navigation. Consider bottom tab bars for apps with 3–5 main sections. They're always visible and thumb-friendly.