diff --git a/Core.js b/Core.js
index 700c49e..d07c52d 100644
--- a/Core.js
+++ b/Core.js
@@ -197,13 +197,13 @@ class SimonUp {
             const id = this._slugify(fullTitle);
             
             this.headings.push({ level: lvl, text: fullTitle, id: id });
-            return `<h${lvl} id="${id}" style="display:inline-block; margin-right:10px;">${fullTitle}</h${lvl}>${rest}`; 
+            return '<h' + lvl + ' id="' + id + '" style="display:inline-block; margin-right:10px;">' + fullTitle + '</h' + lvl + '>' + rest; 
         });
 
         // Regel B: Vom TOC ausgeschlossene Titel (3#- Titel 3#- Restlicher Text)
         html = html.replace(/([1-6])#-\s*([^#]+?)\s*\1#-(.*)/g, (match, level, title, rest) => {
             const lvl = parseInt(level);
-            return `<h${lvl} style="display:inline-block; margin-right:10px;">${title.trim()}</h${lvl}>${rest}`;
+            return '<h' + lvl + ' style="display:inline-block; margin-right:10px;">' + title.trim() + '</h' + lvl + '>' + rest;
         });
 
         // Regel C: Manuelle Nummerierung (3# Titel 3# Restlicher Text)
@@ -212,14 +212,14 @@ class SimonUp {
             const id = this._slugify(title.trim());
             
             this.headings.push({ level: lvl, text: title.trim(), id: id });
-            return `<h${lvl} id="${id}" style="display:inline-block; margin-right:10px;">${title.trim()}</h${lvl}>${rest}`;
+            return '<h' + lvl + ' id="' + id + '" style="display:inline-block; margin-right:10px;">' + title.trim() + '</h' + lvl + '>' + rest;
         });
 
         // Regel D: Das schnelle, solitäre # für H1 (# Titel # Restlicher Text)
         html = html.replace(/#([^#]+)#(.*)/g, (match, title, rest) => {
             const id = this._slugify(title.trim());
             this.headings.push({ level: 1, text: title.trim(), id: id });
-            return `<h1 id="${id}" style="display:inline-block; margin-right:10px;">${title.trim()}</h1>${rest}`;
+            return '<h1 id="' + id + '" style="display:inline-block; margin-right:10px;">' + title.trim() + '</h1>' + rest;
         });
 
         // 3. STANDARD FLUSS-FORMATIERUNGEN (In priorisierter Reihenfolge)