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Mobile browsers report 100vh as the viewport at its largest (URL bar hidden), so flex-centred content sat below the visual centre whenever the address bar was showing. Add 100dvh declarations after the existing 100vh ones on body, #app, .app and .quiz-section (and on the .mod-panel max-height) so modern browsers track the visible viewport while older browsers keep the vh fallback. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>