「HAPPY BIRTHDAY K-POP DEMON HUNTERS IDOL BY DAY · HUNTERS BY NIGHT」は FontVibe AI で作成したバースデーの文字エフェクトです。白フチのくっきりした虹色ストライプの丸い大文字。紙吹雪と風船の束に囲まれ、ピンクからターコイズへの鮮やかなパーティー背景。

Create a finished, extra-wide 21:9 birthday banner with a bright, high-energy K-pop demon-hunter celebration. Set the background as a luminous, richly saturated turquoise-to-violet gradient with hot coral and sunny-yellow accents; keep it bright, never dark or washed-out. Frame the design with generous clusters of shiny multicolor balloons, a dense but controlled burst of confetti, sparkling glints, and short colorful light streaks, leaving clear space around every word. Set the exact text “K-POP DEMON HUNTERS” as a small, clean uppercase top line. Make “HAPPY BIRTHDAY” the dominant central headline, large and instantly readable. Use firm, structured, heavy geometric display capitals, near-square proportions, even strokes, open counters, crisp joins, and gently softened corners—not rounded, inflated, or balloon-shaped. Give the letters a glossy coral-to-teal two-tone finish, a single crisp highlight, a thin sharp white keyline, and a soft drop shadow. Keep the lettering bright, precise, and strongly separated from the colorful background. Set the exact supporting line “IDOL BY DAY · HUNTERS BY NIGHT” small and centered along the lower edge. Below the headline, feature an original trio of stylish K-pop demon hunters in a dynamic, friendly action pose: coordinated stagewear with vivid teal, coral, and violet details, confident expressions, and elegant glowing energy-blade props. Make them appealing, clearly original characters, not recognizable existing performers or franchise characters. Keep the trio centered in the lower middle, partly framed by the headline but not covering any letters. Balance balloon clusters at both outer edges; let confetti and tiny sparkles fill the gaps without obscuring text or faces. Punchy party light, crisp color contrast, polished celebratory finish. Render only the three quoted text lines, exactly as written, with no extra lettering.