Use the image I've attached. It's a rough sketch of a screen for {{app_idea}}. Turn it into a polished, high-fidelity app screen design that follows the sketch's layout exactly: the same elements, in the same order and positions, with the same hierarchy. Design rules: - A clean, modern interface on an 8-point spacing grid, with consistent margins and aligned edges - One accent color from {{brand_colors}} for the main button and active states, with neutral grays everywhere else - A clear type scale in a simple sans serif: one bold title size, one body size and one small label size, all easy to read - Real, specific content that fits the app, never lorem ipsum or placeholder text, and simple line icons wherever the sketch shows icons - Buttons and tap targets big enough for a thumb, and text with strong contrast against its background If the sketch is a phone screen, show it as one flat portrait screen; if it's a desktop layout, show one flat, browser-width screen. No device frame, hands, background scene or watermark.