Great! For a website, it’s beneficial to have a wider range of colors to create visual interest and improve user experience. Here’s an extended color palette that complements your initial selection while maintaining the modern and professional feel.

 <Extended Modern Professional Palette>
1. Navy Blue - 
                            
                            #2C3E50
                         - Conveys professionalism, trust, and authority.
2. Teal - 
                            
                            #1ABC9C
                         - Represents innovation, growth, and energy.
3. Light Gray - 
                            
                            #ECF0F1
                         - Provides a clean, modern backdrop that emphasizes content.
4. Dark Gray - 
                            
                            #7F8C8D
                         - Adds depth and sophistication.
5. Orange - 
                            
                            #E67E22
                         - Draws attention to key elements like buttons or calls to action, suggesting enthusiasm and energy.
6. Soft White - 
                            
                            #FFFFFF
                         - A pure white that enhances contrast and readability, perfect for backgrounds.
7. Sky Blue - 
                            
                            #3498DB
                         - A lighter tone that inspires clarity and communication, great for links or secondary buttons.
8. Olive Green - 
                            
                            #BDC3C7
                         - A muted green that adds a touch of calmness and can be used for less critical buttons or info sections.
9. Charcoal - 
                            
                            #34495E
                         - A darker shade that can be used for text, providing excellent readability against lighter backgrounds.
10. Warm Beige - 
                            
                            #F5F6FA
                         - A soft beige that can be used as an alternative background color to create warmth and approachability.

This extended palette offers additional colors that can be used for various elements on your website, including backgrounds, buttons, and text, while maintaining a cohesive look.

Would you like assistance with how to implement this palette in your website design (e.g., specific UI components, typography)? Or do you want to explore any other design aspects?