Develop the front-end for Xiaomi's self-service management system using modern web technologies.
Audits foreground/background color pairs for WCAG 2.x contrast (AA and AAA for normal and large text), reports ratios and pass/fail, and notes color-blindness risks. Use when checking UI palettes, design tokens, or asking "is this gray-on-white readable?". Includes a stdlib Python contrast checker with --self-test.
Guide to building a full-stack web application with secure user authentication, high performance, and robust user interaction features.