Anime AI Update Concert Banner

Goal: Create a vibrant anime-style social media announcement banner for a major AI image generation update, designed like a high-energy idol band concert poster. Canvas: Wide horizontal 2:1 banner, approximately 1000×500 px. Dense, colorful composition with no empty space, optimized for an eye-catching SNS post thumbnail. Main text: Place a huge bold Japanese headline across the top in thick white lettering with black drop shadow and slight 3D depth: {argument name="headline text" default="ChatGPTによる画像生成が\n大幅アップデート!"}. Directly underneath, centered, add a smaller bold white subtitle with black outline: {argument name="subtitle text" default="GPT-Image-2が無料で使える"}. Text should dominate the upper third and remain highly legible. Scene: A dazzling anime concert stage with golden sparkles, star shapes, lens flares, neon streaks, confetti, glowing particles, and dramatic stage lighting. In the center background, show a large glowing OpenAI-style knot logo inside a warm golden circular light, partially behind the performers. Add futuristic UI monitor panels on the far left and far right edges, showing colorful sci-fi dashboards, circular interface graphics, music visuals, and digital controls. Characters: Show exactly 5 anime band members across the lower half, arranged left to right: 1. Blue-haired keyboard player at far left, long blue hair, white blouse, seated or standing behind a keyboard/synthesizer, calm idol style. 2. Pink-haired vocalist left-center, twin tails with floral accessories, frilly pink idol dress, holding a black microphone and singing with a bright expression. 3. Yellow-orange-haired drummer/front idol in the center-right foreground, energetic smiling face, star hair clip, yellow cropped jacket over white outfit, holding a drumstick toward the viewer; a drum kit is visible behind her. 4. Green/dark-haired bassist or guitarist right-center, black and green streetwear, holding a dark electric bass/guitar, slightly behind the main character. 5. Black-haired guitarist at far right, gothic black outfit with straps and accessories, holding a purple electric guitar. Visual style: Highly polished Japanese anime key visual, idol band aesthetic, glossy digital painting, saturated colors, dynamic lighting, crisp line art, dramatic depth, warm gold and magenta highlights, celebratory tech-news atmosphere. Use cinematic contrast and energetic composition. Constraints: Keep exactly 5 performers and exactly 2 visible text blocks. Make the text readable and centered. Do not add extra logos besides the glowing OpenAI-style symbol. No watermarks, no borders, no photorealism.