Japanese AI Training Banner

Create a sleek Japanese corporate training banner in a wide horizontal web-ad format with a dark navy-to-deep-blue gradient background, subtle glowing network nodes and connecting lines across the upper and middle area, and a high-tech AI/business atmosphere. Place a confident businessman on the right side from waist-up, wearing a dark navy suit, white dress shirt, and blue striped tie, arms crossed, facing forward; crop him partially at the top and right edge. On the left, create a strong typographic hierarchy with a small cyan headline at the top reading headline_text, then an oversized bold white main title reading main_title. Along the lower-left area, place exactly 3 rounded rectangular feature boxes outlined in bright cyan with dark interiors and cyan icons: box 1 shows a terminal/code icon and the text "Claude Codeの基本と応用", box 2 shows a rocket icon and the text "開発スピードを飛躍的に向上", box 3 shows a two-person/team icon and the text "現場ですぐに活かせるスキル". On the far right, overlay a large cyan angled polygon callout panel with bold dark text in 2 lines reading callout_text. Use crisp modern sans-serif Japanese typography, strong contrast, polished marketing design, clean spacing, luminous cyan accents, and a premium AI seminar advertisement look.