A highly sophisticated dark mode button. A subtle gradient spotlight constantly sweeps around the border, while the center remains a deep obsidian. Perfectly suited for main Call-To-Actions.
Create a Linear-style sweep button for dark mode. The button body is solid black (#000000) with bright white text (#f3f4f6). It must feature an animated rotating conic gradient border (using a pseudo-element mask or conic-gradient on a slightly larger absolute background with a spinner animation). The sweep color should be an Indigo (#6366f1) or Purple hue. The button casts a soft underlying glow (0 0 20px rgba(99, 102, 241, 0.15)).