Move decorative gradient glows from ::before/::after pseudo-elements on .app-main to a separate .app-glow div. The pseudo-elements were creating a stacking context that trapped Bootstrap modals (z-index 1055) inside .app-main, while the backdrop (z-index 1050) was appended to <body> — causing the backdrop to render on top of the modal content. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>