3D黑板/白板图标

Blackboard/Whiteboard icon, Education & learning category, Modern teaching tech vibe, Microsoft-style, UI design, utility-focused UI, Writable surface, Chalk writing elements, Magnetic sticker symbols, Dark green-dark olive gradient (blackboard version)/Pure white matte (whiteboard version), Frosted panel material, Matte edge treatment, Icon with mini chalk/eraser, Minimalist metal stand, Wall-mounted structure