Most theme toggles switch colors instantly and feel forgettable. NightWave turns dark mode into a polished experience with a smooth wave transition that expands from the toggle button. Built for modern websites that care about details. • Zero dependencies • Lightweight (~2 KB) • Works with images, cards and backgrounds • Reduced-motion support • System theme sync • Easy drop-in setup with HTML/CSS/JS Made for portfolios, SaaS landing pages and premium interfaces.