bold iconic logo design for an international card game tournament called ISO, inspired by major global sports events like UEFA Champions League and Super Bowl, clean modern style, strong geometric shapes, elegant and minimal, incorporating stylized Bavarian card symbols (acorns, leaves, hearts, bells), subtle reference to Schafkopf culture, premium and prestigious look, dark background with gold and white accents, symmetrical composition, high contrast, simple but memorable, vector style, brandable, no text except ISO, professional sports branding aesthetic Ver mais