Create a stylish marketing poster that features a clean, blank central area for text or images. The background should be vibrant and eye-catching, incorporating a gradient of bold colors like electric blue, neon pink, and sunny yellow. Add abstract geometric shapes or dynamic lines to enhance the sense of energy and movement, while maintaining an overall modern aesthetic. The design should evoke a sense of excitement and creativity, making it ideal for promoting a youthful brand or event.

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Create a stylish marketing poster that features a clean, blank central area for text or images. The background should be vibrant and eye-catching, incorporating a gradient of bold colors like electric blue, neon pink, and sunny yellow. Add abstract geometric shapes or dynamic lines to enhance the sense of energy and movement, while maintaining an overall modern aesthetic. The design should evoke a sense of excitement and creativity, making it ideal for promoting a youthful brand or event.