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. Centered hero composition on a clean white background. Exploratory team of 2D cartoon researchers in red ice-cooled suits navigating through shimmering geothermal heat distortion waves inside crystal cavern, surrounded by rising steam clouds, occupying central 60% of frame. Large white negative margins, bright atmospheric warmth, flat cel colors, clean bold black outlines, no photorealism, no 3D, no text.
