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web/minecraft/motion.js

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+const motionToggle = document.getElementById('motion-toggle');
+const reducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)');
+
+function setMotionPaused(isPaused) {
+    document.documentElement.classList.toggle('motion-running', !isPaused);
+    motionToggle.setAttribute('aria-pressed', String(isPaused));
+    motionToggle.textContent = isPaused ? 'Запустить механизмы' : 'Остановить механизмы';
+}
+
+setMotionPaused(reducedMotion.matches);
+motionToggle.hidden = false;
+motionToggle.addEventListener('click', () => {
+    setMotionPaused(document.documentElement.classList.contains('motion-running'));
+});
+reducedMotion.addEventListener('change', event => setMotionPaused(event.matches));