“Happy Birthday!”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. LETTERFORM PRIORITY: when the chosen font carries its own treatment, that font's letterform shapes take priority and own the letters; this style always governs the color — every letter still carries its own complete top-to-bottom ROYGBIV rainbow gradient. FALLBACK MATERIAL: if the font carries no material of its own, render clean bold letters each filled with a full vertical ROYGBIV rainbow. COLOR PRIORITY: the rainbow gradient is mandatory and overrides any single font color — each individual letter is its own complete rainbow at full Pride-flag saturation. 'Happy Birthday!' rendered as inflated rainbow candy balloon letters, every individual letter containing its own complete vertical ROYGBIV spectrum: saturated red at the top flowing through orange, yellow, green, blue, indigo, and violet at the bottom; never one color per letter and never a rainbow spanning the entire phrase. Thick spherical balloon volume, ultra-glossy vinyl skin, crisp white specular streaks, subtle translucent edge glow, realistic seam details and tiny reflected party lights across the curved surfaces. Surrounding celebration décor includes floating metallic balloons in hot pink, chrome gold, cobalt blue, and bright red, with curled ribbon strands and a suspended scatter of glossy paper confetti in full-spectrum colors. A birthday venue backdrop dissolves into warm amber string-light bokeh, coral and magenta wall illumination, and sunlit golden highlights, keeping the background bright and high-chroma. Use shallow depth of field so the text remains sharply resolved with clean readable edges while balloons and lights soften behind it. Add soft contact shadows beneath the inflated forms, ray-traced reflections, high-key event photography lighting, vibrant 3D commercial render, crisp polished finish.