Design a modern enterprise logo for “Digicust – Digital Customs” featuring a combination mark layout with the icon positioned on the left and the wordmark on the right. The icon should be a strong geometric letter “D” constructed from connected neural network nodes and clean digital grid lines. This design must symbolize AI, the Internet of Customs, smart cities, and automated trade workflows. Use a minimal and precise vector style that is scalable without micro details. The logo should convey a professional B2B aesthetic that feels confident and trustworthy. Incorporate a gradient color flow transitioning smoothly from #647BEF to #7F68EC in the icon. The wordmark for “Digicust” must be a clean, geometric sans-serif typeface. Below the wordmark, include the tagline “Digital Customs” in smaller, spaced typography. Ensure the overall design is a flat vector with a white background, high contrast, and balanced negative space, ready as a production-quality logo system.