hand-drawn 2D explainer cartoon illustration, thick clean black outlines, simplified readable forms, flat cel-style colors, soft minimal shading, expressive human characters, clean educational YouTube illustration, simple depth, clear focal hierarchy, no photorealism, no 3D rendering. Full-frame 16:9 2D cartoon illustration of Naica Crystal Cave entrance threshold. Dark gray limestone cavern archway opening into a vast alien cathedral chamber with giant translucent selenite crystal pillars glowing softly in subterranean dark. Eerie luminescence, clean bold black outlines, flat cel colors, no photorealism, no 3D, no text.
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