diff --git a/docs/issues/PHASE_PLAN_RESPONSIVE_UI.md b/docs/issues/PHASE_PLAN_RESPONSIVE_UI.md
index fedefdb..54f2123 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:** 2026-04-06
+> **Letzte Plan-Aktualisierung:** 2026-04-04
 
 ---
 
@@ -15,7 +15,7 @@
 | P1 | App-Shell: Sidebar + Breakpoint + gemeinsame Navigation | ☑ erledigt | `DesktopSidebar`, `config/appNav.js`, Admin `/admin/*`-Highlight |
 | P2 | Globales Layout & Content-Bereich (CSS) | ☑ erledigt | Desktop: Header aus, Content max 1200px; Mobile unverändert Bottom-Nav |
 | P3 | Dashboard (Desktop-Grid) | ☑ erledigt | 4-spaltige Kennzahlen; Begrüßung; Ernährung/Aktivität 2-spaltig |
-| P4 | Verlauf (Tabs links / Content rechts) | ☐ pending | |
+| 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) | ☐ pending | |
 | P6 | Erfassung / Capture & Formularseiten | ☐ pending | |
 | P7 | Admin & restliche Vollbreiten-Seiten | ☐ pending | |
diff --git a/frontend/src/app.css b/frontend/src/app.css
index d7ca460..bb64c0e 100644
--- a/frontend/src/app.css
+++ b/frontend/src/app.css
@@ -125,6 +125,106 @@ body { font-family: var(--font); background: var(--bg); color: var(--text1); -we
 /* Section */
 .section-gap { margin-bottom: 16px; }
 .page-title { font-size: 20px; font-weight: 700; margin-bottom: 16px; }
+
+/* Verlauf: Mobile Tabs horizontale Leiste, Desktop vertikal links (P4 / RESPONSIVE_UI §5.2) */
+.history-page__title {
+  margin-bottom: 12px;
+}
+
+.history-page__layout {
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+}
+
+.history-tabs {
+  margin-bottom: 0;
+}
+
+.history-tabs__scroller {
+  display: flex;
+  flex-direction: row;
+  gap: 6px;
+  overflow-x: auto;
+  padding-bottom: 6px;
+  -ms-overflow-style: none;
+  scrollbar-width: none;
+}
+
+.history-tabs__scroller::-webkit-scrollbar {
+  display: none;
+}
+
+.history-tab-btn {
+  white-space: nowrap;
+  flex-shrink: 0;
+  padding: 7px 14px;
+  border-radius: 20px;
+  border: 1.5px solid var(--border2);
+  background: var(--surface);
+  color: var(--text2);
+  font-family: var(--font);
+  font-size: 13px;
+  font-weight: 500;
+  cursor: pointer;
+}
+
+.history-tab-btn:hover {
+  border-color: var(--accent);
+  color: var(--text1);
+}
+
+.history-tab-btn.history-tab-btn--active {
+  border-color: var(--accent);
+  background: var(--accent);
+  color: white;
+}
+
+.history-tab-btn.history-tab-btn--active:hover {
+  color: white;
+}
+
+@media (min-width: 1024px) {
+  .history-page__layout {
+    flex-direction: row;
+    align-items: flex-start;
+    gap: 24px;
+  }
+
+  .history-tabs {
+    flex: 0 0 260px;
+    max-width: 280px;
+    position: sticky;
+    top: 16px;
+    align-self: flex-start;
+  }
+
+  .history-tabs__scroller {
+    flex-direction: column;
+    overflow-x: visible;
+    overflow-y: auto;
+    max-height: calc(100vh - 120px);
+    padding-bottom: 0;
+    gap: 8px;
+  }
+
+  .history-tab-btn {
+    display: flex;
+    align-items: center;
+    width: 100%;
+    text-align: left;
+    border-radius: 10px;
+    white-space: normal;
+    flex-shrink: 0;
+    padding: 10px 14px;
+  }
+
+  .history-content {
+    flex: 1;
+    min-width: 0;
+  }
+}
+
 .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/History.jsx b/frontend/src/pages/History.jsx
index 7a7e61e..108c7b9 100644
--- a/frontend/src/pages/History.jsx
+++ b/frontend/src/pages/History.jsx
@@ -985,6 +985,11 @@ export default function History() {
 
   useEffect(()=>{ loadAll() },[])
 
+  useEffect(() => {
+    const t = location.state?.tab
+    if (t && TABS.some(x => x.id === t)) setTab(t)
+  }, [location.state?.tab])
+
   const requestInsight = async (slug) => {
     setLoadingSlug(slug)
     try {
@@ -1007,27 +1012,33 @@ export default function History() {
   const sp={insights,onRequest:requestInsight,loadingSlug,filterActiveSlugs}
 
   return (
-    <div>
-      <h1 className="page-title">Verlauf & Auswertung</h1>
-      <div style={{display:'flex',gap:6,overflowX:'auto',paddingBottom:6,marginBottom:16,
-        msOverflowStyle:'none',scrollbarWidth:'none'}}>
-        {TABS.map(t=>(
-          <button key={t.id} onClick={()=>setTab(t.id)}
-            style={{whiteSpace:'nowrap',padding:'7px 14px',borderRadius:20,flexShrink:0,
-              border:`1.5px solid ${tab===t.id?'var(--accent)':'var(--border2)'}`,
-              background:tab===t.id?'var(--accent)':'var(--surface)',
-              color:tab===t.id?'white':'var(--text2)',
-              fontFamily:'var(--font)',fontSize:13,fontWeight:500,cursor:'pointer'}}>
-            {t.label}
-          </button>
-        ))}
+    <div className="history-page">
+      <h1 className="page-title history-page__title">Verlauf & Auswertung</h1>
+      <div className="history-page__layout">
+        <nav className="history-tabs" aria-label="Verlauf-Kategorien">
+          <div className="history-tabs__scroller">
+            {TABS.map(t => (
+              <button
+                key={t.id}
+                type="button"
+                className={`history-tab-btn${tab === t.id ? ' history-tab-btn--active' : ''}`}
+                onClick={() => setTab(t.id)}
+                aria-current={tab === t.id ? 'page' : undefined}
+              >
+                {t.label}
+              </button>
+            ))}
+          </div>
+        </nav>
+        <div className="history-content">
+          {tab==='body'        && <BodySection      weights={weights} calipers={calipers} circs={circs} profile={profile} {...sp}/>}
+          {tab==='nutrition'   && <NutritionSection nutrition={nutrition} weights={weights} profile={profile} {...sp}/>}
+          {tab==='activity'    && <ActivitySection  activities={activities} globalQualityLevel={activeProfile?.quality_filter_level} {...sp}/>}
+          {tab==='recovery'    && <RecoverySection  {...sp}/>}
+          {tab==='correlation' && <CorrelationSection corrData={corrData} profile={profile} {...sp}/>}
+          {tab==='photos'      && <PhotoGrid/>}
+        </div>
       </div>
-      {tab==='body'        && <BodySection      weights={weights} calipers={calipers} circs={circs} profile={profile} {...sp}/>}
-      {tab==='nutrition'   && <NutritionSection nutrition={nutrition} weights={weights} profile={profile} {...sp}/>}
-      {tab==='activity'    && <ActivitySection  activities={activities} globalQualityLevel={activeProfile?.quality_filter_level} {...sp}/>}
-      {tab==='recovery'    && <RecoverySection  {...sp}/>}
-      {tab==='correlation' && <CorrelationSection corrData={corrData} profile={profile} {...sp}/>}
-      {tab==='photos'      && <PhotoGrid/>}
     </div>
   )
 }