Based on your logo color #53578B and your request for a color palette that includes a purple tone, here is a curated color palette that maintains a cohesive look while ensuring WCAG 2.1 compliance for accessibility:

 <Purple Harmony> 
1. Background - 
                            
                            #F5F5F5
                         - A soft, light gray that serves as a neutral background, promoting readability and a clean aesthetic.
2. Text - 
                            
                            #333333
                         - A rich dark gray that provides excellent contrast against the background, ensuring legibility for body text.
3. Primary Action - 
                            
                            #53578B
                         - Your logo color, a deep purple-blue that can be used for primary call-to-action buttons, creating a strong focal point.
4. Secondary Action - 
                            
                            #A68BB2
                         - A lighter lavender tone that complements the primary action color, suitable for secondary buttons or links.
5. Accent - 
                            
                            #D6C2E3
                         - A soft pastel purple that adds a gentle touch to the design, ideal for hover effects or subtle highlights.

Description:

The “Purple Harmony” palette combines a light background with dark text for clarity, while incorporating your logo color as the primary action hue. The secondary action color adds depth and usability, while the accent color introduces a playful element that can be used sparingly for emphasis.

Follow-Up Questions:

1. What kind of mood or theme are you aiming for with your website?
2. Do you have specific areas where you plan to use these colors (e.g., headers, footers, buttons)?
3. Would you like to see any additional variations or options within this palette?