3D logo icon for online English tutor. Four rounded squares interlocked like a puzzle, forming a unified block. Each square features a minimalist embossed icon: sound waves for speaking, an ear for listening, an open book for reading, and a pen for writing. Vibrant color palette: coral red, electric blue, lime green, and golden yellow. Smooth glossy plastic material, soft ambient studio lighting, clean solid white background, isometric projection, minimalist friendly aesthetic, modern high-tech brand identity. Below the icon, clean modern blue typography text that reads "CoolEnglish", 3D render, octane render style, high resolution.
