Design a minimalist logo for the brand ‘ForstFabrik,’ inspired by forestry and nature. The logo should be purely symbolic, featuring simple, clean lines that evoke elements like a pine tree, mountain, or an abstracted axe or saw blade. Keep the design very minimalistic with no text or letters, focusing on a balanced and geometric shape that conveys strength, nature, and craftsmanship. Use a monochrome color scheme, ideally in deep green or earthy tones, to emphasize simplicity and natural elegance.