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if (typeof window === "undefined") return; function nextQuestion(step) { const current = document.getElementById('q' + step); const next = document.getElementById('q' + (step + 1)); if (!current || !next) return; current.classList.add('hidden'); next.classList.remove('hidden'); const progress = document.getElementById('quiz-progress'); if (progress) progress.style.width = (step + 1) * 33 + '%'; } function showResult() { // výpočet, text, zobrazení výsledku }