A massive snow fortress built on a ...

A massive snow fortress built on a mountain in a snowy biome. The structure is made from stone bricks, spruce wood, and packed ice. The building has five full floors connected by wide staircases and corridors. Each floor contains multiple separate closed rooms: guard rooms, storage rooms, combat halls, and side chambers. The entrance has a large detailed gate and two symmetrical towers. The upper floors become slightly smaller, creating a tall layered design. The top floor contains a large circular hall with pillars. The structure should be fully solid, complete, and detailed with no broken walls or holes.