diff --git a/frontend/src/tools/devtools.jsx b/frontend/src/tools/devtools.jsx
index b72dcba..be68047 100644
--- a/frontend/src/tools/devtools.jsx
+++ b/frontend/src/tools/devtools.jsx
@@ -945,47 +945,37 @@ function diffLines(a, b) {
   const aLines = a.split('\n');
   const bLines = b.split('\n');
   const m = aLines.length, n = bLines.length;
-  // LCS dp
   const dp = Array.from({length: m+1}, () => new Array(n+1).fill(0));
   for (let i = m-1; i >= 0; i--)
     for (let j = n-1; j >= 0; j--)
       dp[i][j] = aLines[i] === bLines[j] ? dp[i+1][j+1]+1 : Math.max(dp[i+1][j], dp[i][j+1]);
-  // Build flat ops
-  const ops = [];
-  let i = 0, j = 0;
+  // Build rows: same / del / add — consecutive del+add stay paired (same display line number)
+  const rows = []; // {type, lineA, lineB, text}
+  let i = 0, j = 0, lnA = 0, lnB = 0;
   while (i < m || j < n) {
     if (i < m && j < n && aLines[i] === bLines[j]) {
-      ops.push({type:'same', a:aLines[i], b:bLines[j]}); i++; j++;
+      lnA++; lnB++;
+      rows.push({type:'same', ln: lnA, text: aLines[i]});
+      i++; j++;
     } else if (j < n && (i >= m || dp[i][j+1] >= dp[i+1][j])) {
-      ops.push({type:'add', a:null, b:bLines[j]}); j++;
+      lnB++;
+      rows.push({type:'add', ln: lnB, text: bLines[j]});
+      j++;
     } else {
-      ops.push({type:'del', a:aLines[i], b:null}); i++;
+      lnA++;
+      rows.push({type:'del', ln: lnA, text: aLines[i]});
+      i++;
     }
   }
-  // Pair up consecutive del+add into 'change' rows
-  const paired = [];
-  let k = 0;
-  while (k < ops.length) {
-    if (ops[k].type==='del' && k+1 < ops.length && ops[k+1].type==='add') {
-      paired.push({type:'change', a:ops[k].a, b:ops[k+1].b}); k+=2;
-    } else {
-      paired.push(ops[k]); k++;
-    }
-  }
-  return paired;
+  return rows;
 }
 
-// Compute set of changed line numbers (1-based) for a given side
-function changedLineNums(pairs, side) {
+// Which line numbers (1-based) in text A/B are changed
+function changedLineNums(rows, side) {
   const set = new Set();
-  let ln = 0;
-  pairs.forEach(p => {
-    if (p.type==='same') { ln++; }
-    else if (p.type==='change') { ln++; set.add(ln); }
-    else if (p.type==='del' && side==='a') { ln++; set.add(ln); }
-    else if (p.type==='add' && side==='b') { ln++; set.add(ln); }
-    else if (p.type==='del' && side==='b') { /* b has no line here */ }
-    else if (p.type==='add' && side==='a') { /* a has no line here */ }
+  rows.forEach(r => {
+    if (r.type === 'del' && side === 'a') set.add(r.ln);
+    if (r.type === 'add' && side === 'b') set.add(r.ln);
   });
   return set;
 }
@@ -1011,11 +1001,10 @@ function TextDiff({ mobile }) {
     e.target.value = '';
   }
 
-  const added   = diff ? diff.filter(d=>d.type==='add'||d.type==='change').length : 0;
-  const removed = diff ? diff.filter(d=>d.type==='del'||d.type==='change').length : 0;
+  const added   = diff ? diff.filter(d=>d.type==='add').length : 0;
+  const removed = diff ? diff.filter(d=>d.type==='del').length : 0;
   const same    = diff ? diff.filter(d=>d.type==='same').length : 0;
 
-  // Which lines are changed in each textarea (for background highlight)
   const changedA = diff ? changedLineNums(diff, 'a') : new Set();
   const changedB = diff ? changedLineNums(diff, 'b') : new Set();
 
@@ -1023,14 +1012,13 @@ function TextDiff({ mobile }) {
     boxSizing:'border-box', minHeight:180, resize:'vertical', lineHeight:'1.6', padding:'7px 8px' };
 
   function LineNumCol({ text, changedSet }) {
-    const lines = (text||' ').split('\n');
     return (
       <div style={{
         padding:'7px 6px', minWidth:36, textAlign:'right', userSelect:'none',
         fontFamily:"'Courier New',monospace", fontSize:12, lineHeight:'1.6',
         background:'rgba(0,0,0,0.2)', borderRight:'1px solid rgba(255,255,255,0.07)',
         whiteSpace:'pre', flexShrink:0}}>
-        {lines.map((_, i) => (
+        {(text||' ').split('\n').map((_,i) => (
           <div key={i} style={{
             color: changedSet.has(i+1) ? '#ff6b9d' : 'rgba(255,255,255,0.25)',
             background: changedSet.has(i+1) ? 'rgba(255,107,157,0.12)' : 'transparent',
@@ -1073,9 +1061,9 @@ function TextDiff({ mobile }) {
         {!!diff && (
           <div style={{display:'flex', gap:10, alignItems:'center', flexWrap:'wrap'}}>
             <span style={{background:'rgba(255,107,157,0.15)', color:'#ff6b9d', fontFamily:'monospace',
-              fontSize:11, padding:'4px 10px', borderRadius:6}}>− {removed} entfernt/geändert</span>
+              fontSize:11, padding:'4px 10px', borderRadius:6}}>− {removed} entfernt</span>
             <span style={{background:'rgba(78,205,196,0.15)', color:'#4ecdc4', fontFamily:'monospace',
-              fontSize:11, padding:'4px 10px', borderRadius:6}}>+ {added} hinzugefügt/geändert</span>
+              fontSize:11, padding:'4px 10px', borderRadius:6}}>+ {added} hinzugefügt</span>
             <span style={{background:'rgba(255,255,255,0.05)', color:'rgba(255,255,255,0.45)', fontFamily:'monospace',
               fontSize:11, padding:'4px 10px', borderRadius:6}}>= {same} gleich</span>
           </div>
@@ -1085,73 +1073,29 @@ function TextDiff({ mobile }) {
       {!!diff && (
         <div style={{borderRadius:9, border:'1px solid rgba(255,255,255,0.08)',
           overflow:'auto', maxHeight:520, background:'rgba(0,0,0,0.2)'}}>
-          {/* Header */}
-          <div style={{display:'grid', gridTemplateColumns:'36px 16px 1fr 36px 16px 1fr',
-            borderBottom:'1px solid rgba(255,255,255,0.1)', background:'rgba(255,255,255,0.04)'}}>
-            <div style={{gridColumn:'1/4', padding:'5px 10px', color:'rgba(255,255,255,0.4)', fontFamily:'monospace', fontSize:10, borderRight:'1px solid rgba(255,255,255,0.08)'}}>Text A (Original)</div>
-            <div style={{gridColumn:'4/7', padding:'5px 10px', color:'rgba(255,255,255,0.4)', fontFamily:'monospace', fontSize:10}}>Text B (Neu)</div>
-          </div>
-          <table style={{width:'100%', borderCollapse:'collapse', fontFamily:"'Courier New',monospace", fontSize:12, tableLayout:'fixed'}}>
-            <colgroup>
-              <col style={{width:36}}/><col style={{width:16}}/><col/>
-              <col style={{width:36}}/><col style={{width:16}}/><col/>
-            </colgroup>
+          <table style={{width:'100%', borderCollapse:'collapse', fontFamily:"'Courier New',monospace", fontSize:12}}>
             <tbody>
-              {(()=>{
-                let lnA=0, lnB=0;
-                return diff.map((d,i)=>{
-                  const isChange = d.type==='change';
-                  const isDel    = d.type==='del';
-                  const isAdd    = d.type==='add';
-                  const isSame   = d.type==='same';
-                  if (isSame)   { lnA++; lnB++; }
-                  if (isChange) { lnA++; lnB++; }
-                  if (isDel)    lnA++;
-                  if (isAdd)    lnB++;
-
-                  const bgA = (isDel||isChange) ? 'rgba(255,107,157,0.1)' : 'transparent';
-                  const bgB = (isAdd||isChange) ? 'rgba(78,205,196,0.1)'  : 'transparent';
-                  const colA = isDel||isChange ? '#ffb3cc' : 'rgba(255,255,255,0.65)';
-                  const colB = isAdd||isChange ? '#a8f0eb' : 'rgba(255,255,255,0.65)';
-                  const symA = isDel?'−': isChange?'~':'';
-                  const symB = isAdd?'+': isChange?'~':'';
-                  const symColA = isDel?'#ff6b9d': isChange?'#ffe66d':'rgba(255,255,255,0.15)';
-                  const symColB = isAdd?'#4ecdc4': isChange?'#ffe66d':'rgba(255,255,255,0.15)';
-
-                  return (
-                    <tr key={i} style={{borderBottom:'1px solid rgba(255,255,255,0.03)'}}>
-                      {/* Side A */}
-                      <td style={{background:bgA, textAlign:'right', padding:'2px 6px', color:'rgba(255,255,255,0.2)',
-                        borderRight:'1px solid rgba(255,255,255,0.05)', userSelect:'none', fontSize:11}}>
-                        {(isDel||isChange||isSame) ? lnA : ''}
-                      </td>
-                      <td style={{background:bgA, textAlign:'center', padding:'2px 3px', color:symColA,
-                        fontWeight:700, fontSize:13, userSelect:'none',
-                        borderRight:'1px solid rgba(255,255,255,0.06)'}}>
-                        {symA}
-                      </td>
-                      <td style={{background:bgA, padding:'3px 8px', whiteSpace:'pre-wrap', wordBreak:'break-all',
-                        color:colA, borderRight:'2px solid rgba(255,255,255,0.06)'}}>
-                        {(isDel||isChange||isSame) ? (d.a ?? d.text ?? ' ') : ''}
-                      </td>
-                      {/* Side B */}
-                      <td style={{background:bgB, textAlign:'right', padding:'2px 6px', color:'rgba(255,255,255,0.2)',
-                        borderRight:'1px solid rgba(255,255,255,0.05)', userSelect:'none', fontSize:11}}>
-                        {(isAdd||isChange||isSame) ? lnB : ''}
-                      </td>
-                      <td style={{background:bgB, textAlign:'center', padding:'2px 3px', color:symColB,
-                        fontWeight:700, fontSize:13, userSelect:'none',
-                        borderRight:'1px solid rgba(255,255,255,0.06)'}}>
-                        {symB}
-                      </td>
-                      <td style={{background:bgB, padding:'3px 8px', whiteSpace:'pre-wrap', wordBreak:'break-all',
-                        color:colB}}>
-                        {(isAdd||isChange||isSame) ? (d.b ?? d.text ?? ' ') : ''}
-                      </td>
-                    </tr>
-                  );
-                });
-              })()}
+              {diff.map((d,i) => (
+                <tr key={i} style={{
+                  background: d.type==='add' ? 'rgba(78,205,196,0.1)' : d.type==='del' ? 'rgba(255,107,157,0.1)' : 'transparent',
+                  borderBottom:'1px solid rgba(255,255,255,0.03)'}}>
+                  <td style={{width:36, textAlign:'right', padding:'2px 8px', userSelect:'none',
+                    color:'rgba(255,255,255,0.2)', fontSize:11,
+                    borderRight:'1px solid rgba(255,255,255,0.05)'}}>
+                    {d.ln}
+                  </td>
+                  <td style={{width:20, textAlign:'center', padding:'2px 4px', userSelect:'none',
+                    color: d.type==='add'?'#4ecdc4': d.type==='del'?'#ff6b9d':'rgba(255,255,255,0.15)',
+                    fontWeight:700, fontSize:14,
+                    borderRight:'1px solid rgba(255,255,255,0.05)'}}>
+                    {d.type==='add'?'+': d.type==='del'?'−':''}
+                  </td>
+                  <td style={{padding:'3px 10px', whiteSpace:'pre-wrap', wordBreak:'break-all',
+                    color: d.type==='add'?'#a8f0eb': d.type==='del'?'#ffb3cc':'rgba(255,255,255,0.65)'}}>
+                    {d.text || ' '}
+                  </td>
+                </tr>
+              ))}
             </tbody>
           </table>
         </div>