A customer recently updated their brand guidelines, prompting changes in typography that included tighter letter-spacing. While this adjustment worked well in print, it hindered readability on the web, especially with smaller text. To address this, the author proposed applying letter-spacing adjustments only for larger font sizes. However, testing revealed inconsistencies between headings and subheadings, prompting the search for a smoother transition in letter-spacing as font size increased. The solution involved using modern CSS with a single rule that applies a dynamic letter-spacing adjustment based on the font size. The rule employs the `clamp` function to set minimum and maximum letter-spacing values while dynamically adjusting the spacing as the font-size grows. The calculations involve using the universal selector to apply the rule to all elements, adjusting the letter-spacing in a controlled manner without sacrificing design integrity. The author stressed the importance of fine-tuning these values based on project specifics, as each design context will have its unique requirements. Future improvements in CSS, such as the `progress()` function, promise to simplify these calculations even further. The author expresses caution about manipulating letter-spacing too much, suggesting it's best suited for large headings or specific use cases. While responsive design poses challenges, these CSS techniques allow designers to work effectively within various constraints, optimizing typography for digital environments.