Great! Considering that the toolkit will be used for Instagram posts and stories, it’s essential to have a vibrant and engaging color palette that captures attention and maintains clarity on digital platforms. Here’s the refined color palette, keeping in mind the medium of social media:

 <High School Club Toolkit for Social Media> 
1. Background Light Gray - 
                            
                            #F7F7F7
                         - A soft, neutral light gray for backgrounds that ensures content stands out and maintains a clean, modern look on social media.
2. Title Green - 
                            
                            #A0CF67
                         - The refreshing green used for large text, such as titles, to convey growth and positivity, making key messages eye-catching.
3. Text Navy - 
                            
                            #003A70
                         - This strong navy blue provides excellent contrast for body text, ensuring legibility against light backgrounds, ideal for captions and descriptions.
4. Accent Purple - 
                            
                            #C792DF
                         - A vibrant lavender for accents, buttons, or highlights, adding creativity and visual interest to stories and posts.
5. Highlight Yellow - 
                            
                            #FCEB8B
                         - A cheerful yellow for calls-to-action or important information, helping to draw attention in the busy social media feed.

This palette is especially suited for dynamic platforms like Instagram, ensuring posts and stories are visually appealing and effectively convey information.

Follow-up questions:

1. Are there any specific fonts or typography styles you plan to use that might influence the color choices?
2. Do you want to include specific elements like icons or graphics that might require additional colors or adjustments?
3. Would you like to explore any particular themes (like seasonal, event-specific, etc.) that could further influence the color usage?