hilfe eingebaut

public/js/app.js

@@ -54,6 +54,18 @@ async function loadCards() {
     renderBoard();
 }
 
+// ── Help ──
+
+const helpOverlay = document.getElementById('help');
+function openHelp() { helpOverlay?.classList.add('open'); }
+function closeHelp() { helpOverlay?.classList.remove('open'); }
+document.getElementById('help-btn')?.addEventListener('click', openHelp);
+document.getElementById('help-close')?.addEventListener('click', closeHelp);
+helpOverlay?.addEventListener('click', e => { if (e.target === helpOverlay) closeHelp(); });
+document.addEventListener('keydown', e => {
+    if (e.key === 'F1') { e.preventDefault(); helpOverlay?.classList.contains('open') ? closeHelp() : openHelp(); }
+});
+
 // ── Export / Import ──
 
 document.getElementById('export-btn')?.addEventListener('click', () => { window.location.href = 'api/export'; });