“gui”是使用 FontVibe AI 创作的几何文字效果。包豪斯式大写字母，由圆、方与直线构成，平涂红、蓝、黄、黑，像实心积木一样立在硬朗顶光下。

Bauhaus geometric environment: hard overhead directional light — single cold-white source, zero ambient scatter, ruler-sharp geometric shadow edges below all forms. Background plane is architecturally flat: pure black void, deep matte concrete, or stark white plaster. No depth haze, no organic texture, no atmospheric bokeh. Scene vocabulary: Bauhaus workshop geometry, De Stijl primary-color planes, Constructivist poster surface, Swiss grid precision. Primary color atmosphere (always active): flat geometric primary-color planes — signal red, cobalt blue, cadmium yellow — appear as background architectural blocks or compositional color bars alongside the letterforms. Zero gradient, zero sheen. When no specific material is defined by the font: letterforms rendered with Bauhaus primary color flat-paint treatment — each letter one vivid matte hue cycling across the primary palette: signal red, cobalt blue, cadmium yellow, flat black. Hard 45-degree isometric extrusion with pure-black side wall, depth 25% of letter height. Flat matte acrylic surface, zero sheen. Sharp machined edge between color face and extrusion wall. Three compact letterforms — g, u, i — occupy the frame with bold typographic presence, each rendered as a flat matte primary-color block: signal red, cobalt blue, cadmium yellow cycling across the trio. Hard 45-degree isometric extrusion with pure-black side walls, depth precisely 25% of letter height, machined edges razor-sharp between color face and shadow wall. Background: pure black void — absolute zero ambient scatter, maximum contrast. Single cold-white overhead directional light source casting ruler-sharp geometric shadow silhouettes downward onto the matte concrete ground plane. A horizontal cadmium yellow color bar occupies the background as a compositional anchor, flat and zero-gradient, functioning as a De Stijl architectural plane behind the letterforms. Cobalt blue rectangular block anchors a secondary corner of the composition. Swiss grid discipline governs all spatial relationships — every shadow edge aligns to an invisible orthographic grid. Ground plane is matte dark concrete, no reflections, no organic texture. Zero atmospheric haze, zero bokeh. The scene breathes with Bauhaus workshop energy: compact, vivid, mathematically resolved.