Hard, solid-color 100% opacity offset shadow. Pure Neo-brutalism design standard without any blur spread.
CSS Math Analysis
Implement a Neo-Brutalist shadow system. Shadows must have exactly 0px blur radius. Use an offset like 4px 4px base, expanding to 8px 8px on hover, paired with black 2px solid borders. Do not scale the element, move it physically via translation if needed or just expand the solid shadow. Highly retro, geometric vibe.