Design a colossal 1750x1750 block d...

Design a colossal 1750x1750 block dark fantasy mega-castle with extreme vertical scale, featuring a sky-piercing central keep, towering spires, massive fortress walls, elevated bridges, and layered architecture. Make it fully functional with dozens of spacious, detailed rooms including a grand throne hall, royal quarters, libraries, armories, barracks, kitchens, dining halls, workshops, storage vaults, treasure rooms, crypts, prisons, and hidden passages, leaving space for future expansion. Use blackstone, deepslate, polished basalt, and dark prismarine with polished quartz accents and emerald blocks integrated throughout as a major secondary material. Add gargoyles, colossal statues, waterfalls, glowing green lighting, dramatic landscaping, and an ancient, imposing atmosphere.