Design a logo for 'linggan.AI', a language learning center where individuals can rent spaces to teach languages to eager learners. The logo should prominently feature a light bulb as the central motif, symbolizing creativity, illumination, and the spark of learning. Incorporate playful elements to evoke a welcoming and enjoyable learning environment. Utilize shades of blue and light blue to reflect professionalism, trustworthiness, and tranquility. Ensure the design is versatile and scalable for various applications, including signage, digital platforms, and promotional materials. Strive for a balance between simplicity and visual appeal to make the logo memorable and easily recognizable.