“2409班 生日快乐 童心闪闪 · 快乐加倍”是使用 FontVibe AI 创作的Y2K 泡泡字文字效果。Y2K 泡泡充气字母——圆润柔软的充气造型，粉紫马卡龙配色，糖果光泽表面。甜甜的 2000 年代派对女孩风。

Create a finished, wide landscape birthday backdrop for a children's class celebration. Make the exact Chinese text crisp and correctly written, with no extra words: the largest central line is 「2409班」; above it, a smaller but prominent line reads 「生日快乐」; below it, a neat supporting line reads 「童心闪闪 · 快乐加倍」. Keep every line clearly separated and easy to read from across a room. Build all lettering from extremely inflated, spherical bubble forms, as if each stroke were a separate high-pressure inflatable toy, bulging outward with near-bursting volume. Use smooth glossy candy-like surfaces, pastel pink blending into lavender across the letters, rounded strong white specular highlights on the top of each convex stroke, and soft matching inner glow. Give the Chinese characters sturdy, open shapes and generous spacing so they remain legible; preserve the exact digits and Chinese characters. No flat or thin lettering. Use a playful, polished Y2K party world around the letters: a soft sky-blue-to-pastel-pink background with a gentle luminous center, rounded reflections, small floating stars and hearts, and a few glossy balloon-like spheres. Add one clear hero prop: a cute two-tier birthday cake centered beneath the title, decorated with pastel frosting, tiny candles, and rounded candy details. Keep the cake visibly separate from the text and secondary to the title. The result should feel joyful and celebratory for children, with the glossy inflated lettering as the unmistakable focal point. Balanced wide-stage composition, ample outer margins, clean readable hierarchy, richly finished but uncluttered. Render only the three quoted text lines exactly as written.