hihayk/shaper — reverse-engineered prompt

Build me a small web app called Shaper that helps someone visually shape interface styles without writing code. I want a clean editing screen where I can tweak things like colors, text size, spacing, rounded corners, borders, and shadows, then immediately see those changes on example interface pieces like buttons, cards, inputs, and panels.

Make it feel like a design playground, not a complicated developer tool. The main value is that I can adjust a few style controls and quickly discover a nice looking UI direction. It should be smooth, responsive, and pleasant to use, with a simple preview area and an obvious way to copy or reuse the final style values.

Keep the design minimal and modern, and make sure it works well in the browser. Use the existing project as inspiration, especially the idea of an interface styles shaper. Look up current docs online if you need to.