Explore the intricacies of responsive color in CSS with this 46-minute conference talk from CSS Day 2015. Delve into the secrets behind hex color values and learn simple mathematical techniques to adjust color attributes like saturation and brightness. Understand why colors appear differently across devices and discover strategies to address this issue. Master the art of adjusting colors with media queries to optimize appearance across various screen sizes. Examine how user context influences appropriate color choices for websites. Simplify color management by leveraging CSS preprocessors like Sass to handle color selections and automatically generate variations. Gain insights into color notation systems, opacity, colorblindness considerations, and accessibility best practices. Learn about device-specific color challenges, responsive design techniques, and methods for testing color accessibility.