Art style: Children's Book.
Back inside the den, now completely dark except for a sliver of silver moonlight entering the tunnel. All four foxes are curled into a single, large pile of fur. They are all fast asleep. The atmosphere is quiet and cozy, with deep midnight blues and soft silver highlights on the tips of their ears and tails.
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FINAL STYLE ENFORCEMENT (this is the authoritative rendering directive — it overrides any style wording elsewhere in the prompt):
Render this image entirely in "Children's Book" style. Match the lighting grammar, material response, colour science, level of realism / stylisation, line weight, and shading model typical of "Children's Book". Keep the subject, composition, camera angle, lighting direction, and colour palette from the description above — but EVERY surface, skin, fabric, material, and environmental element must be rendered in the "Children's Book" idiom, not in any other medium.
