Drift District 3D Game Builder

Build Drift District, a stylized 3D driving and logistics tycoon game set in an explorable American coastal city. This comprehensive prompt covers vehicle physics, delivery missions, vehicle upgrades, fleet management, employee automation, business economics, district exploration, UI/UX, mobile optimization, save systems, monetization, and QA. Includes a modular Unity/C# architecture, a playable vertical-slice roadmap, and detailed acceptance criteria for developing an expandable mobile game.