Minimalist business book cover with white text on a dark blue background and a golden upward-trending line graph.

Create an international bestseller business book cover, minimalist and premium design. Clean, clear and highly readable typography. Modern, elegant layout with strong visual hierarchy. Title: “Die 3-5-7 Formel” -- large, bold, modern sans-serif typography, perfectly centered and dominant. Subtitle: “Für unaufhaltsames Wachstum in deinem Geschäft” -- smaller, refined, clean typography beneath the title. Author name: John Koch -- subtle but professional placement. Publisher logo text: KORDONI -- small, elegant, positioned at the bottom. Visual style: sophisticated business aesthetic, international bestseller look, calm and confident. Color palette: deep blue, white, charcoal, and subtle gold accents OR modern monochrome with one accent color. Abstract geometric elements or subtle growth symbolism (lines, arrows, steps, upward movement), no clutter, no illustrations, no people. Flat design, high contrast, print-ready, sharp focus, no mockup, no background objects. Aspect ratio: book cover vertical (2:3). Ultra high quality, professional publishing standard, Amazon bestseller style. See more