diff --git a/app/(tabs)/apps.tsx b/app/(tabs)/apps.tsx
index d353f43..a294ca3 100644
--- a/app/(tabs)/apps.tsx
+++ b/app/(tabs)/apps.tsx
@@ -1,5 +1,6 @@
 import { View, Text, ScrollView, RefreshControl } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
+import { webContentMaxWidth } from "~/lib/responsive";
 import { useRouter } from "expo-router";
 import { useTranslation } from "react-i18next";
 import { useCallback, useState } from "react";
@@ -34,6 +35,7 @@ export default function AppsScreen() {
       <ScrollView
         className="flex-1"
         contentContainerClassName="px-5 pb-8 pt-4"
+        contentContainerStyle={webContentMaxWidth}
         showsVerticalScrollIndicator={false}
         refreshControl={
           <RefreshControl refreshing={isRefreshing} onRefresh={onRefresh} tintColor="#1e40af" />
diff --git a/app/(tabs)/index.tsx b/app/(tabs)/index.tsx
index 5a3de4c..e3f39a8 100644
--- a/app/(tabs)/index.tsx
+++ b/app/(tabs)/index.tsx
@@ -1,5 +1,6 @@
 import { View, Text, ScrollView, RefreshControl } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
+import { webContentMaxWidth } from "~/lib/responsive";
 import {
   LayoutDashboard,
   ChevronRight,
@@ -115,6 +116,7 @@ export default function HomeScreen() {
       <ScrollView
         className="flex-1"
         contentContainerClassName="px-5 pb-8 pt-4"
+        contentContainerStyle={webContentMaxWidth}
         showsVerticalScrollIndicator={false}
         refreshControl={
           <RefreshControl refreshing={isRefreshing} onRefresh={onRefresh} tintColor="#1e40af" />
diff --git a/app/(tabs)/more.tsx b/app/(tabs)/more.tsx
index 11ff2d4..864d381 100644
--- a/app/(tabs)/more.tsx
+++ b/app/(tabs)/more.tsx
@@ -1,5 +1,6 @@
 import { View, Text, ScrollView, TouchableOpacity } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
+import { webContentMaxWidth } from "~/lib/responsive";
 import {
   UserCircle,
   Bell,
@@ -81,7 +82,11 @@ export default function MoreScreen() {
 
   return (
     <SafeAreaView className="flex-1 bg-background" edges={["top", "left", "right"]}>
-      <ScrollView className="flex-1" showsVerticalScrollIndicator={false}>
+      <ScrollView
+        className="flex-1"
+        contentContainerStyle={webContentMaxWidth}
+        showsVerticalScrollIndicator={false}
+      >
         {/* Profile Header */}
         <TouchableOpacity
           className="flex-row items-center px-5 py-5 border-b border-border/30"
diff --git a/app/(tabs)/notifications.tsx b/app/(tabs)/notifications.tsx
index 97797bd..7392bb2 100644
--- a/app/(tabs)/notifications.tsx
+++ b/app/(tabs)/notifications.tsx
@@ -1,6 +1,7 @@
 import React from "react";
 import { View, Text, ScrollView, Pressable } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
+import { webContentMaxWidth } from "~/lib/responsive";
 import { Bell, CheckCheck, Circle, WifiOff } from "lucide-react-native";
 import { useRouter } from "expo-router";
 import { useTranslation } from "react-i18next";
@@ -146,6 +147,7 @@ export default function NotificationsScreen() {
         <ScrollView
           className="flex-1"
           contentContainerClassName="px-1 pb-8 pt-2"
+        contentContainerStyle={webContentMaxWidth}
         >
           {notifications.map((n) => (
             <NotificationRow key={n.id} notification={n} onPress={handlePress} />
diff --git a/app/(tabs)/profile.tsx b/app/(tabs)/profile.tsx
index ba420b2..226e554 100644
--- a/app/(tabs)/profile.tsx
+++ b/app/(tabs)/profile.tsx
@@ -1,5 +1,6 @@
 import { View, Text, ScrollView } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
+import { webContentMaxWidth } from "~/lib/responsive";
 import { UserCircle } from "lucide-react-native";
 import { useRouter } from "expo-router";
 import { Button } from "~/components/ui/Button";
@@ -37,6 +38,7 @@ export default function ProfileScreen() {
       <ScrollView
         className="flex-1"
         contentContainerClassName="px-5 pb-8 pt-4"
+        contentContainerStyle={webContentMaxWidth}
       >
         <View className="items-center pt-10">
           <View className="rounded-full bg-muted p-5">
diff --git a/app/(tabs)/search.tsx b/app/(tabs)/search.tsx
index 2020227..64339bc 100644
--- a/app/(tabs)/search.tsx
+++ b/app/(tabs)/search.tsx
@@ -1,5 +1,6 @@
 import { View, Text, TouchableOpacity, ScrollView, ActivityIndicator } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
+import { webContentMaxWidth } from "~/lib/responsive";
 import { Search as SearchIcon, X, ChevronRight, FileText, SearchX } from "lucide-react-native";
 import { useRouter } from "expo-router";
 import { useTranslation } from "react-i18next";
@@ -68,6 +69,7 @@ export default function SearchScreen() {
         <ScrollView
           className="flex-1"
           contentContainerClassName="px-5 pb-8 pt-4"
+        contentContainerStyle={webContentMaxWidth}
           keyboardShouldPersistTaps="handled"
         >
           <Text className="mb-3 text-xs font-medium text-muted-foreground">
diff --git a/app/ai.tsx b/app/ai.tsx
index 9328f6b..f682bd9 100644
--- a/app/ai.tsx
+++ b/app/ai.tsx
@@ -11,6 +11,7 @@ import {
 } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
 import { useTranslation } from "react-i18next";
+import { webContentMaxWidth } from "~/lib/responsive";
 import * as Clipboard from "expo-clipboard";
 import {
   Send,
@@ -305,6 +306,7 @@ export default function AIAssistantScreen() {
           ref={scrollRef}
           className="flex-1"
           contentContainerClassName="px-4 py-4"
+          contentContainerStyle={webContentMaxWidth}
           keyboardShouldPersistTaps="handled"
         >
           {messages.length === 0 ? (
@@ -356,8 +358,11 @@ export default function AIAssistantScreen() {
           )}
         </ScrollView>
 
-        {/* Input bar */}
-        <View className="flex-row items-end gap-2 border-t border-border bg-card px-3 py-2.5">
+        {/* Input bar — capped + centered on web to align with the message column */}
+        <View
+          className="w-full flex-row items-end gap-2 border-t border-border bg-card px-3 py-2.5"
+          style={webContentMaxWidth}
+        >
           <TextInput
             className="max-h-28 flex-1 rounded-2xl border border-input bg-background px-4 py-2.5 text-base text-foreground"
             value={draft}
diff --git a/components/renderers/DetailViewRenderer.tsx b/components/renderers/DetailViewRenderer.tsx
index 96c8b06..ba5b233 100644
--- a/components/renderers/DetailViewRenderer.tsx
+++ b/components/renderers/DetailViewRenderer.tsx
@@ -1,5 +1,6 @@
 import React, { useMemo, useState } from "react";
 import { View, Text, ScrollView, Pressable, ActivityIndicator } from "react-native";
+import { webContentMaxWidth } from "~/lib/responsive";
 import {
   Edit,
   Trash2,
@@ -567,6 +568,7 @@ export function DetailViewRenderer({
       <ScrollView
         className="flex-1"
         contentContainerClassName="px-4 pb-8 pt-4"
+        contentContainerStyle={webContentMaxWidth}
       >
         {/* Field sections */}
         {sections.map((section, idx) => {
diff --git a/components/renderers/FormViewRenderer.tsx b/components/renderers/FormViewRenderer.tsx
index 462a6f8..f55e77d 100644
--- a/components/renderers/FormViewRenderer.tsx
+++ b/components/renderers/FormViewRenderer.tsx
@@ -9,6 +9,7 @@ import {
 } from "react-native";
 import { ChevronDown, ChevronUp } from "lucide-react-native";
 import { Button } from "~/components/ui/Button";
+import { webContentMaxWidth } from "~/lib/responsive";
 import {
   isFieldVisible,
   isFieldReadonlyByCondition,
@@ -310,6 +311,7 @@ export function FormViewRenderer({
       <ScrollView
         className="flex-1"
         contentContainerClassName="px-4 pb-8 pt-4"
+        contentContainerStyle={webContentMaxWidth}
         keyboardShouldPersistTaps="handled"
       >
         {sections.map((section, idx) => {
diff --git a/components/renderers/ListViewRenderer.tsx b/components/renderers/ListViewRenderer.tsx
index ce43f16..4e8c402 100644
--- a/components/renderers/ListViewRenderer.tsx
+++ b/components/renderers/ListViewRenderer.tsx
@@ -7,6 +7,7 @@ import {
   RefreshControl,
 } from "react-native";
 import { FlashList } from "@shopify/flash-list";
+import { webContentMaxWidth } from "~/lib/responsive";
 import { ChevronDown, ChevronUp, Check, Search as SearchIcon, AlertCircle } from "lucide-react-native";
 import { cn } from "~/lib/utils";
 import { EmptyState } from "~/components/common/EmptyState";
@@ -392,7 +393,10 @@ export function ListViewRenderer({
 
       const rowContent = (
         <Pressable
-          style={customBg ? { backgroundColor: customBg } : undefined}
+          // Cap + center each row on wide web so the list reads as a column,
+          // not edge-to-edge (no-op on native). Per-row keeps FlashList's
+          // virtualization intact — its contentContainerStyle is padding-only.
+          style={[webContentMaxWidth, customBg ? { backgroundColor: customBg } : null]}
           className={cn(
             "mb-2 rounded-xl px-4 active:bg-muted/50",
             densityClass,
diff --git a/lib/responsive.ts b/lib/responsive.ts
new file mode 100644
index 0000000..0dd1895
--- /dev/null
+++ b/lib/responsive.ts
@@ -0,0 +1,18 @@
+import { Platform, type ViewStyle } from "react-native";
+
+/**
+ * Reading-column width cap for wide web viewports.
+ *
+ * On the web the app runs in a full-width browser window, so lists, cards, and
+ * chat bubbles stretch edge-to-edge and become hard to scan. Spreading this
+ * into a scroll view's `contentContainerStyle` (or a wrapping View's `style`)
+ * caps the content column and centers it.
+ *
+ * It is a deliberate **no-op on native** (and on narrow web, where `maxWidth`
+ * simply never binds) — the device viewport is already width-constrained, so
+ * this never changes the phone layout.
+ */
+export const webContentMaxWidth: ViewStyle | undefined =
+  Platform.OS === "web"
+    ? { width: "100%", maxWidth: 820, alignSelf: "center" }
+    : undefined;