Based on your primary red ( #F34141 ), I will create a web-friendly color palette with complementary colors for blue, amber, teal, green, pink, purple, and greys, ensuring WCAG 2.1 compliance for contrast.

 <Web-Friendly Color Palette>
1. Background - 
                            
                            #FFFFFF
                         - A clean, bright white that provides a neutral backdrop for content.
2. Text - 
                            
                            #2D2D2D
                         - A dark grey for text that ensures readability against the white background.
3. Primary Action - 
                            
                            #F34141
                         - A vibrant red for primary buttons and important actions, drawing attention.
4. Secondary Action - 
                            
                            #007BFF
                         - A bold blue for secondary buttons, creating a calming contrast to the red.
5. Accent - 
                            
                            #FFC107
                         - A warm amber that adds a touch of brightness and can be used for highlights or alerts.

Description of the Color Palette:

This palette is designed for a bright and engaging user interface. The vibrant red serves as the primary action color, capturing user attention effectively. The deep blue provides a complementary secondary action color that maintains a professional and approachable feel. The warm amber accent color adds visual interest without overwhelming the user. The dark grey text ensures high readability, while the white background keeps the interface clean and open.

Follow-Up Questions:

1. What is the intended audience for your interface?
2. Are there any specific emotions or themes you want to convey with this color palette?
3. Do you have any other colors or branding elements that need to be considered?