Build a premium floating cosmic-fan...

Build a premium floating cosmic-fantasy hub matching the concept art: one large central island with a grand quartz, polished deepslate, and dark prismarine observatory, a teal glass dome, projecting telescope, and a huge floating vertical amethyst ring above it as the main landmark. Add 7 smaller satellite islands around the hub for the Pokecenter, Guild Hall, Player Shops, Battle Arena, Cosmos Tower, and hidden Map Room access. Connect all islands with elegant arched bridges. Only use this cool celestial palette: quartz, polished deepslate, dark prismarine, prismarine bricks, teal/cyan glass, sea lanterns, amethyst, limited gold, dark oak, azalea, moss, glow lichen, waterfalls, and crystal micro-islands. Make it symmetrical, readable, majestic. No warm tones, nether blocks, or ore blocks.