diff --git a/DEVLOG.md b/DEVLOG.md
index 4c94860..f286375 100644
--- a/DEVLOG.md
+++ b/DEVLOG.md
@@ -4189,3 +4189,19 @@ Keine Commits in dieser Session.
 - DEVLOG.md | 38 ++++++++++++++++++++++++++++++++++++++
 
 ---
+## 2026-09-05 14:55 – 14:59 (4m)
+**Beschreibung:** Claude Code Session
+**Projekt:** asb-material
+
+### Commits
+- 7ebbae8 style: visuelles Redesign (Desktop), Design-Anleihe bei Resgrid/OpenFleet/EMCS
+
+### Geänderte Dateien
+- DEVLOG.md                                         |  33 ++++++++++++
+- frontend/src/pages/DashboardPage.tsx              |  36 ++++++-------
+- frontend/src/pages/FehlbestandListePage.tsx       |   2 +-
+- frontend/src/pages/MangelListePage.tsx            |   4 +-
+- frontend/src/pages/admin/QualifikationSection.tsx |   2 +-
+- frontend/src/styles/global.css                    | 201 ++++++++++++++++++++++++++++++++++++++++++++++++--------------------
+
+---
diff --git a/frontend/src/pages/admin/MaterialSection.tsx b/frontend/src/pages/admin/MaterialSection.tsx
index 9f9568f..e87fef3 100644
--- a/frontend/src/pages/admin/MaterialSection.tsx
+++ b/frontend/src/pages/admin/MaterialSection.tsx
@@ -78,8 +78,8 @@ export function MaterialSection({ materialien, onGeaendert, onFehler }: Props) {
   return (
     <section className="section">
       <h2>Material</h2>
-      <div style={{ display: "flex", flexDirection: "row", alignItems: "flex-start", gap: "1.25rem" }}>
-        <div className="card" style={{ flex: "0 0 20rem", width: "20rem", boxSizing: "border-box" }}>
+      <div className="split-layout">
+        <div className="card split-layout-sidebar">
           <h3 style={{ marginTop: 0 }}>{bearbeiteteId !== null ? "Material bearbeiten" : "Material anlegen"}</h3>
           <div className="stack">
             <div className="field">
@@ -137,7 +137,7 @@ export function MaterialSection({ materialien, onGeaendert, onFehler }: Props) {
           </div>
         </div>
 
-        <div style={{ flex: "1 1 0%", minWidth: 0 }}>
+        <div className="split-layout-content">
           <input
             className="input input-search"
             style={{ marginBottom: "1rem" }}
diff --git a/frontend/src/pages/admin/ObjektPositionenPanel.tsx b/frontend/src/pages/admin/ObjektPositionenPanel.tsx
index 0684811..41f5264 100644
--- a/frontend/src/pages/admin/ObjektPositionenPanel.tsx
+++ b/frontend/src/pages/admin/ObjektPositionenPanel.tsx
@@ -152,12 +152,9 @@ export function ObjektPositionenPanel({ objektId, vorlageId, materialien, onFehl
   const verfuegbareMaterialien = materialien.filter((m) => !vorhandeneMaterialIds.has(m.id));
 
   return (
-    <div style={{ display: "flex", flexDirection: "row", alignItems: "flex-start", gap: "1.25rem" }}>
+    <div className="split-layout">
       {positionen.length > 0 && (
-        <nav
-          className="card"
-          style={{ flex: "0 0 12rem", width: "12rem", boxSizing: "border-box", padding: "0.5rem" }}
-        >
+        <nav className="card split-layout-sidebar-sm">
           <button
             className={aktivesFach === null ? "btn btn-primary btn-block" : "btn btn-secondary btn-block"}
             style={{ marginBottom: "0.3rem" }}
@@ -178,7 +175,7 @@ export function ObjektPositionenPanel({ objektId, vorlageId, materialien, onFehl
         </nav>
       )}
 
-      <div style={{ flex: "1 1 0%", minWidth: 0 }}>
+      <div className="split-layout-content">
         <div className="row" style={{ flexWrap: "wrap", marginBottom: "1rem" }}>
           <select
             className="input"
diff --git a/frontend/src/pages/admin/ObjektSection.tsx b/frontend/src/pages/admin/ObjektSection.tsx
index eea1232..ef53fd7 100644
--- a/frontend/src/pages/admin/ObjektSection.tsx
+++ b/frontend/src/pages/admin/ObjektSection.tsx
@@ -263,9 +263,9 @@ export function ObjektSection({
   return (
     <section className="section">
       <h2>Objekte</h2>
-      <div style={{ display: "flex", flexDirection: "row", alignItems: "flex-start", gap: "1.25rem" }}>
+      <div className="split-layout">
       {!nurPflegen && (
-      <div className="card" style={{ flex: "0 0 20rem", width: "20rem", boxSizing: "border-box" }}>
+      <div className="card split-layout-sidebar">
         <h3 style={{ marginTop: 0 }}>Objekt aus Vorlage anlegen</h3>
         {vorlagen.length === 0 ? (
           <p className="text-muted">
@@ -342,7 +342,7 @@ export function ObjektSection({
       </div>
       )}
 
-      <div style={{ flex: "1 1 0%", minWidth: 0 }}>
+      <div className="split-layout-content">
         <input
           className="input input-search"
           style={{ marginBottom: "1rem" }}
diff --git a/frontend/src/pages/admin/ZustaendigkeitSection.tsx b/frontend/src/pages/admin/ZustaendigkeitSection.tsx
index 4b50e3e..a69faf0 100644
--- a/frontend/src/pages/admin/ZustaendigkeitSection.tsx
+++ b/frontend/src/pages/admin/ZustaendigkeitSection.tsx
@@ -103,8 +103,8 @@ export function ZustaendigkeitSection({ standorte, objekte, benutzer, onFehler }
   return (
     <section className="section">
       <h2>Zuständigkeit</h2>
-      <div style={{ display: "flex", flexDirection: "row", alignItems: "flex-start", gap: "1.25rem" }}>
-        <div className="card" style={{ flex: "0 0 20rem", width: "20rem", boxSizing: "border-box" }}>
+      <div className="split-layout">
+        <div className="card split-layout-sidebar">
           <p className="text-muted" style={{ marginBottom: "1rem" }}>
             Wer ist materialverantwortlich für welchen Standort/welches Objekt. Standort-Zuordnung
             gilt für alle Objekte dort, Objekt-Zuordnung ist eine zusätzliche, feinere Ergänzung.
@@ -182,7 +182,7 @@ export function ZustaendigkeitSection({ standorte, objekte, benutzer, onFehler }
           </div>
         </div>
 
-        <div style={{ flex: "1 1 0%", minWidth: 0 }}>
+        <div className="split-layout-content">
           <input
             className="input input-search"
             style={{ marginBottom: "1rem" }}
diff --git a/frontend/src/styles/global.css b/frontend/src/styles/global.css
index e882e52..29c5495 100644
--- a/frontend/src/styles/global.css
+++ b/frontend/src/styles/global.css
@@ -461,3 +461,74 @@ select.input:focus {
   margin: 0.2rem 0 0.4rem;
   line-height: 1;
 }
+
+/* -- Responsive: mobile Durchgang 2026-09-05 -----------------------------
+   Formular-Sidebar + Liste (Objekte/Material/Zuständigkeit/Positionen)
+   nutzten bisher fixe 20rem-Breite nebeneinander - bricht auf Mobile, da
+   beide Spalten dann zusammen breiter als der Bildschirm sind. */
+
+.split-layout {
+  display: flex;
+  align-items: flex-start;
+  gap: 1.25rem;
+}
+
+.split-layout-sidebar {
+  flex: 0 0 20rem;
+  width: 20rem;
+  box-sizing: border-box;
+}
+
+.split-layout-sidebar-sm {
+  flex: 0 0 12rem;
+  width: 12rem;
+  box-sizing: border-box;
+  padding: 0.5rem;
+}
+
+.split-layout-content {
+  flex: 1 1 0%;
+  min-width: 0;
+}
+
+@media (max-width: 768px) {
+  .split-layout {
+    flex-direction: column;
+  }
+
+  .split-layout-sidebar,
+  .split-layout-sidebar-sm {
+    width: 100%;
+    flex: 1 1 auto;
+  }
+
+  .page-wide {
+    padding: 1.25rem 1rem 2rem;
+  }
+
+  .topbar {
+    padding: 0.6rem 0.9rem;
+    flex-wrap: wrap;
+  }
+
+  .topbar-nav {
+    gap: 0.15rem;
+  }
+
+  .topbar-nav a {
+    padding: 0.4rem 0.6rem;
+    font-size: 0.85rem;
+  }
+
+  h1 {
+    font-size: 1.35rem;
+  }
+
+  .card-grid > .card {
+    flex: 1 1 100%;
+  }
+
+  .row {
+    flex-wrap: wrap;
+  }
+}