Objective: Use this skill to prevent cross-platform rendering bugs and style inconsistencies by enforcing QSS-specific syntax, platform-aware theming, and proper cascade discipline.

PyQt Styling - QSS (Qt Style Sheets)

QSS (Qt Style Sheets) is Qt's styling system. It resembles CSS but has critical differences that cause cross-platform bugs.

QSS Is Not CSS

QSS shares CSS syntax but differs in supported selectors, properties, and cascade behavior. These differences are the source of most cross-platform bugs.

Unsupported or Different Selectors