Letter - Seven Gradient Square

Create a letter logo that incorporates the concept of 'Seven Gradient Square'. The logo should feature the letter 'S' designed with a gradient effect that transitions through seven vibrant colors, arranged in a square format. Use elegant and modern fonts to enhance the professionalism and creativity of the design. The color palette should be bright and eye-catching, conveying a sense of uniqueness and technological innovation. Ensure that the overall composition is visually impactful and suitable for a contemporary brand.