“Sweet 16”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. Birthday party backdrop in use: 'Sweet 16' rainbow balloon letters mounted on a white balloon wall backdrop at a real birthday party. Birthday person silhouette stands in front taking a photo. String lights frame the backdrop. Colorful balloons all around, guests visible in background. Real birthday party using rainbow text as a photo opportunity backdrop.