Design a minimalist luxury 3D advertising poster for Prince Biscuits. The centerpiece is a surreal giant golden biscuit castle constructed entirely from iconic Prince biscuits. The biscuit structure should feel imaginative and unexpected while instantly recognizable as the brand's signature product. Use realistic biscuit textures, embossed details, cream layers, and subtle crumb elements to create a premium visual metaphor of a kingdom built from Prince biscuits. Place a tiny human character beside the giant biscuit castle, actively exploring and climbing its towers with a small ladder. The miniature figure should create a strong sense of scale, storytelling, and playful curiosity while maintaining a clean, sophisticated composition. Use Prince's signature red and golden-yellow color palette as the background, with a smooth gradient and plenty of negative space. Keep the composition centered and balanced. Position the Prince Biscuits logo at the top of the poster. Place the brand slogan "The Taste of Happiness" elegantly at the bottom. Style requirements: Minimalist, intelligent, visually striking, premium advertising design, ultra-detailed 3D rendering, photorealistic biscuit textures, commercial campaign quality, luxury product photography, soft studio lighting, subtle shadows, clean background, modern fashion-ad aesthetic, highly shareable social media campaign. Format: Vertical poster, 9:16 ratio. Rendering style: Ultra-realistic CGI, Behance-worthy advertising presentation, premium food branding, cinematic lighting, luxury commercial artwork, launch-ready marketing visual.