巨大な白い塔がそびえる、歩ける3D帝都の島都市

Build an interactive 3D fantasy imperial city as one browser project, using Three.js or a similar WebGL library. Place a walled island capital with a very tall white central tower, domed palaces, ring walls, an arena, gardens, bridges and a waterfront, surrounded by water, hills and distant mountains. Use a muted stone, white and green palette with teal domes and warm terracotta roofs, and a dark, elegant UI with serif lettering. Add a side menu listing named districts; clicking one flies the camera to it. Include an orbit view over the whole city and a street-level walking mode with small townsfolk. Add a day and night toggle with lit windows after dark. Done means the camera moves smoothly between districts, the city feels dense and readable from far away and up close, and it runs at a steady frame rate in a normal desktop browser.