diff --git a/docs/issues/PHASE_PLAN_RESPONSIVE_UI.md b/docs/issues/PHASE_PLAN_RESPONSIVE_UI.md
index fec7466..de4f394 100644
--- a/docs/issues/PHASE_PLAN_RESPONSIVE_UI.md
+++ b/docs/issues/PHASE_PLAN_RESPONSIVE_UI.md
@@ -3,7 +3,7 @@
 > **Gitea:** [#30 – Responsive UI](http://192.168.2.144:3000/Lars/mitai-jinkendo/issues/30)  
 > **Spec:** `.claude/docs/functional/RESPONSIVE_UI.md`  
 > **Breakpoint:** `<1024px` = Mobile (Bottom-Nav, bestehendes Verhalten), `≥1024px` = Desktop (Sidebar 220px)  
-> **Letzte Plan-Aktualisierung:** 2026-04-04 (P5)
+> **Letzte Plan-Aktualisierung:** 2026-04-04 (P6; P7 Admin bewusst offen)
 
 ---
 
@@ -17,8 +17,8 @@
 | P3 | Dashboard (Desktop-Grid) | ☑ erledigt | 4-spaltige Kennzahlen; Begrüßung; Ernährung/Aktivität 2-spaltig |
 | P4 | Verlauf (Tabs links / Content rechts) | ☑ erledigt | `History.jsx` + `.history-*` in `app.css`; Tab-State bei `location.state.tab` |
 | P5 | Analyse (Prompts links / Ergebnis rechts) | ☑ erledigt | `Analysis.jsx` + `.analysis-split*` in `app.css` |
-| P6 | Erfassung / Capture & Formularseiten | ☐ pending | |
-| P7 | Admin & restliche Vollbreiten-Seiten | ☐ pending | |
+| P6 | Erfassung / Capture & Formularseiten | ☑ erledigt | `.capture-page` / `.capture-page--wide` in `app.css`; CaptureHub, Wizard, Gewicht–Ziele, Guide, Ernährung/Aktivität/Vital/Schlaf breiter |
+| P7 | Admin & restliche Vollbreiten-Seiten | ⏸ Konzeption | Layout nach Abstimmung; nicht mit P6 mitgezogen |
 | P8 | Abschluss, Regression, Spec-Pflege | ☐ pending | |
 
 **Status-Legende:** `☐ pending` · `◐ in Arbeit` · `☑ erledigt` · `⏸ blockiert`
diff --git a/frontend/src/app.css b/frontend/src/app.css
index e21136b..abdb611 100644
--- a/frontend/src/app.css
+++ b/frontend/src/app.css
@@ -344,6 +344,25 @@ body { font-family: var(--font); background: var(--bg); color: var(--text1); -we
   }
 }
 
+/* P6 / RESPONSIVE_UI §5.4 – Erfassung: Desktop zentriert; data-lastige Seiten etwas breiter */
+.capture-page {
+  width: 100%;
+  max-width: 100%;
+  box-sizing: border-box;
+}
+
+@media (min-width: 1024px) {
+  .capture-page {
+    max-width: 600px;
+    margin-left: auto;
+    margin-right: auto;
+  }
+
+  .capture-page--wide {
+    max-width: 900px;
+  }
+}
+
 .muted { color: var(--text3); font-size: 13px; }
 .empty-state { text-align: center; padding: 48px 16px; color: var(--text3); }
 .empty-state h3 { font-size: 16px; color: var(--text2); margin-bottom: 6px; }
diff --git a/frontend/src/pages/ActivityPage.jsx b/frontend/src/pages/ActivityPage.jsx
index 4031afc..69c5cd5 100644
--- a/frontend/src/pages/ActivityPage.jsx
+++ b/frontend/src/pages/ActivityPage.jsx
@@ -254,7 +254,7 @@ export default function ActivityPage() {
   }
 
   return (
-    <div>
+    <div className="capture-page capture-page--wide">
       <h1 className="page-title">Aktivität</h1>
 
       <div className="tabs" style={{overflowX:'auto',flexWrap:'nowrap'}}>
diff --git a/frontend/src/pages/CaliperScreen.jsx b/frontend/src/pages/CaliperScreen.jsx
index 0b1564e..e3b2d61 100644
--- a/frontend/src/pages/CaliperScreen.jsx
+++ b/frontend/src/pages/CaliperScreen.jsx
@@ -160,7 +160,7 @@ export default function CaliperScreen() {
   }
 
   return (
-    <div>
+    <div className="capture-page">
       <div style={{display:'flex',alignItems:'center',justifyContent:'space-between',marginBottom:16}}>
         <h1 className="page-title" style={{margin:0}}>Caliper</h1>
         <button className="btn btn-secondary" style={{fontSize:12,padding:'6px 10px'}} onClick={()=>nav('/guide')}>
diff --git a/frontend/src/pages/CaptureHub.jsx b/frontend/src/pages/CaptureHub.jsx
index 5da1fcb..5888fdb 100644
--- a/frontend/src/pages/CaptureHub.jsx
+++ b/frontend/src/pages/CaptureHub.jsx
@@ -85,7 +85,7 @@ const ENTRIES = [
 export default function CaptureHub() {
   const nav = useNavigate()
   return (
-    <div>
+    <div className="capture-page">
       <h1 className="page-title">Erfassen</h1>
       <div style={{display:'flex',flexDirection:'column',gap:10}}>
         {ENTRIES.map(e => (
diff --git a/frontend/src/pages/CircumScreen.jsx b/frontend/src/pages/CircumScreen.jsx
index ea1fb5e..0fde54d 100644
--- a/frontend/src/pages/CircumScreen.jsx
+++ b/frontend/src/pages/CircumScreen.jsx
@@ -85,7 +85,7 @@ export default function CircumScreen() {
   }
 
   return (
-    <div>
+    <div className="capture-page">
       <div style={{display:'flex',alignItems:'center',justifyContent:'space-between',marginBottom:16}}>
         <h1 className="page-title" style={{margin:0}}>Umfänge</h1>
         <button className="btn btn-secondary" style={{fontSize:12,padding:'6px 10px'}} onClick={()=>nav('/guide')}>
diff --git a/frontend/src/pages/CustomGoalsPage.jsx b/frontend/src/pages/CustomGoalsPage.jsx
index 5fdcf7d..fde20e4 100644
--- a/frontend/src/pages/CustomGoalsPage.jsx
+++ b/frontend/src/pages/CustomGoalsPage.jsx
@@ -117,7 +117,7 @@ export default function CustomGoalsPage() {
   }
 
   return (
-    <div style={{ paddingBottom: 80 }}>
+    <div className="capture-page" style={{ paddingBottom: 80 }}>
       {/* Header */}
       <div style={{
         background: 'linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%)',
diff --git a/frontend/src/pages/GuidePage.jsx b/frontend/src/pages/GuidePage.jsx
index 3835328..7f05aca 100644
--- a/frontend/src/pages/GuidePage.jsx
+++ b/frontend/src/pages/GuidePage.jsx
@@ -36,7 +36,7 @@ export default function GuidePage() {
   const methodPoints = CALIPER_METHODS[caliperMethod]?.points_m || []
 
   return (
-    <div>
+    <div className="capture-page">
       <h1 className="page-title">Messanleitung</h1>
 
       <div className="tabs">
diff --git a/frontend/src/pages/MeasureWizard.jsx b/frontend/src/pages/MeasureWizard.jsx
index 0f932e5..93e56f3 100644
--- a/frontend/src/pages/MeasureWizard.jsx
+++ b/frontend/src/pages/MeasureWizard.jsx
@@ -344,7 +344,7 @@ export default function MeasureWizard() {
 
   if (done) {
     return (
-      <div style={{display:'flex',flexDirection:'column',alignItems:'center',justifyContent:'center',
+      <div className="capture-page" style={{display:'flex',flexDirection:'column',alignItems:'center',justifyContent:'center',
         minHeight:'60vh',gap:16,textAlign:'center'}}>
         <div style={{fontSize:48}}>✅</div>
         <h2 style={{fontSize:20,fontWeight:700}}>Gespeichert!</h2>
@@ -361,11 +361,19 @@ export default function MeasureWizard() {
     )
   }
 
-  if (mode === 'circum') return <CircumWizard onDone={()=>setDone(true)} onCancel={()=>setMode(null)}/>
-  if (mode === 'caliper') return <CaliperWizard onDone={()=>setDone(true)} onCancel={()=>setMode(null)} profile={profile}/>
+  if (mode === 'circum') return (
+    <div className="capture-page">
+      <CircumWizard onDone={()=>setDone(true)} onCancel={()=>setMode(null)}/>
+    </div>
+  )
+  if (mode === 'caliper') return (
+    <div className="capture-page">
+      <CaliperWizard onDone={()=>setDone(true)} onCancel={()=>setMode(null)} profile={profile}/>
+    </div>
+  )
 
   return (
-    <div>
+    <div className="capture-page">
       <h1 className="page-title">Assistent</h1>
       <p style={{fontSize:13,color:'var(--text2)',marginBottom:20,lineHeight:1.6}}>
         Der Assistent führt dich Schritt für Schritt durch die Messung – mit Anleitung für jeden Messpunkt.
diff --git a/frontend/src/pages/NutritionPage.jsx b/frontend/src/pages/NutritionPage.jsx
index d278cdc..e92b8b8 100644
--- a/frontend/src/pages/NutritionPage.jsx
+++ b/frontend/src/pages/NutritionPage.jsx
@@ -802,7 +802,7 @@ export default function NutritionPage() {
   useEffect(() => { load() }, [])
 
   return (
-    <div>
+    <div className="capture-page capture-page--wide">
       <h1 className="page-title">Ernährung</h1>
 
       {/* Input Method Tabs */}
diff --git a/frontend/src/pages/RestDaysPage.jsx b/frontend/src/pages/RestDaysPage.jsx
index 4f793f2..8cc2dcc 100644
--- a/frontend/src/pages/RestDaysPage.jsx
+++ b/frontend/src/pages/RestDaysPage.jsx
@@ -177,7 +177,7 @@ export default function RestDaysPage() {
   }
 
   return (
-    <div>
+    <div className="capture-page">
       <h1 className="page-title">Ruhetage</h1>
 
       {/* Toast Notification */}
diff --git a/frontend/src/pages/SleepPage.jsx b/frontend/src/pages/SleepPage.jsx
index 1237880..f586f84 100644
--- a/frontend/src/pages/SleepPage.jsx
+++ b/frontend/src/pages/SleepPage.jsx
@@ -142,7 +142,7 @@ export default function SleepPage() {
   }
 
   return (
-    <div style={{ padding: '16px 16px 80px' }}>
+    <div className="capture-page capture-page--wide" style={{ padding: '16px 16px 80px' }}>
       {/* Toast Notification */}
       {toast && (
         <div style={{
diff --git a/frontend/src/pages/VitalsPage.jsx b/frontend/src/pages/VitalsPage.jsx
index 6e94708..ef4593e 100644
--- a/frontend/src/pages/VitalsPage.jsx
+++ b/frontend/src/pages/VitalsPage.jsx
@@ -1064,7 +1064,7 @@ export default function VitalsPage() {
   }
 
   return (
-    <div>
+    <div className="capture-page capture-page--wide">
       <h1 className="page-title">Vitalwerte</h1>
 
       <div className="tabs" style={{ overflowX: 'auto', flexWrap: 'nowrap' }}>
diff --git a/frontend/src/pages/WeightScreen.jsx b/frontend/src/pages/WeightScreen.jsx
index 0f24a8a..8afa370 100644
--- a/frontend/src/pages/WeightScreen.jsx
+++ b/frontend/src/pages/WeightScreen.jsx
@@ -78,7 +78,7 @@ export default function WeightScreen() {
   const avgAll = weights.length ? Math.round(weights.reduce((a,b)=>a+b,0)/weights.length*10)/10 : null
 
   return (
-    <div>
+    <div className="capture-page">
       <h1 className="page-title">Gewicht</h1>
 
       {/* Eingabe */}