“NightOwl”是使用 FontVibe AI 创作的彩虹文字效果。绚丽的多彩虹色渐变文字特效，色彩过渡顺滑，棱镜般的光泽与欢快的多彩排版。

rendered as rainbow text effect — COLOR (mandatory): each individual letter must contain a complete ROYGBIV rainbow gradient top-to-bottom within itself — top=red, upper=orange, mid=yellow-green, lower=blue-indigo, bottom=violet. NOT one color per letter. NOT a gradient across the whole word. Every letter is its own complete rainbow. Full chroma Pride flag saturation — not pastel, not muted, not shifted to any single hue. Thumbnail design workflow in Canva: browser window showing Canva's design editor. Canvas shows a YouTube thumbnail being designed — 'NightOwl' in rainbow balloon letters placed as transparent PNG overlay on a night cityscape background photo. Canva toolbar and panels visible around the canvas. Content creator adding rainbow text to their YouTube thumbnail in a real design tool.