A vibrant cartoon with colours and smooth animation. Create a 30-second vertical 9:16 children's animated musical Short. MAIN CHARACTER: Bobo, an original cute blue bunny with big friendly eyes, wearing a small yellow backpack. STORY: Bobo walks through a colorful magical garden. He discovers a red apple, a yellow sun, a green tree, and a blue butterfly. Bobo happily sings an original educational song teaching children these four colors. SONG: Create a completely original, simple, cheerful children's melody and lyrics about red, yellow, green and blue. Do NOT use any existing nursery rhyme melody or copyrighted song. VISUAL STYLE: High-quality colorful 3D children's animation. Cute rounded characters. Bright cheerful environment. Smooth expressive animation. Friendly facial expressions. No scary elements. Consistent Bobo character throughout the entire video. AUDIO: Cheerful original children's singing voice. Clear pronunciation. Light playful background music. Add simple sound effects. TEXT: Show large colorful subtitles matching the words being sung. ENDING: Bobo smiles and waves at the camera. Make the final video approximately 30 seconds. No logos, no watermarks if the platform allows, no copyrighted characters.