diff --git a/src/pages/Login.module.css b/src/pages/Login.module.css
index 4394f61..a66ca81 100644
--- a/src/pages/Login.module.css
+++ b/src/pages/Login.module.css
@@ -1,16 +1,21 @@
 .container {
   display: flex;
-  min-height: 100vh;
-
+  min-height: 100dvh;
   font-family: "DM Sans", sans-serif;
   color: var(--color-bg);
 }
 
+@supports not (min-height: 100dvh) {
+  .container {
+    min-height: 100vh;
+  }
+}
+
 .mainContent {
   flex: 1;
   display: flex;
   flex-direction: column;
-  padding: 3rem;
+  padding: 2.5rem 2rem;
   background-color: var(--color-bg);
 }
 
@@ -18,39 +23,28 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  width: 100%;
   flex: 1;
 }
 
-.logoText {
-  
-  font-size: 35px;
+.logo {
   display: flex;
+  justify-content: center;
   align-items: center;
-  letter-spacing: -0.5px;
-  font-weight: 200;
+  width: 100%;
 }
 
-.logoPower {
-  color: var(--color-text);
-}
-
-.logoOn {
-  color: var(--color-secondary);
-  font-weight: 700;
-}
-
-.logo img {
-  height: 40px;
+.logoImage {
+  height: 44px;
+  width: auto;
+  object-fit: contain;
 }
 
 .loginBox {
-
-
   background-color: var(--color-bg);
-  width: 25%;
+  width: min(100%, 460px);
   height: auto;
-
-  margin-top: 5%;
+  margin-top: 2rem;
   padding: 2rem;
 
   border-radius: 25px;
@@ -297,3 +291,41 @@ button:disabled {
 .passwordResetLink .textButton:hover {
   color: var(--color-secondary);
 }
+
+@media (max-width: 768px) {
+  .mainContent {
+    padding: 1rem;
+  }
+
+  .logoImage {
+    height: 40px;
+  }
+
+  .loginBox {
+    width: 100%;
+    margin-top: 1.25rem;
+    padding: 1.25rem;
+    border-radius: 20px;
+  }
+
+  .registerLink {
+    flex-wrap: wrap;
+    text-align: center;
+  }
+}
+
+@media (max-width: 420px) {
+  .mainContent {
+    padding: 0.75rem;
+  }
+
+  .loginBox {
+    padding: 1rem;
+    border-radius: 16px;
+  }
+
+  .input,
+  .button {
+    height: 48px;
+  }
+}
diff --git a/src/pages/Login.tsx b/src/pages/Login.tsx
index d06bca0..f5673ee 100644
--- a/src/pages/Login.tsx
+++ b/src/pages/Login.tsx
@@ -108,10 +108,11 @@ function Login() {
     <div className={styles.container}>
       <div className={styles.mainContent}>
         <div className={styles.logo}>
-          <div className={styles.logoText}>
-            <span className={styles.logoPower}>Power</span>
-            <span className={styles.logoOn}>On</span>
-          </div>
+          <img
+            src="/logos/poweron-logo.png"
+            alt="PowerOn"
+            className={styles.logoImage}
+          />
         </div>
         <div className={styles.loginSection}>
           <div className={styles.loginBox}>
diff --git a/src/pages/PasswordResetRequest.module.css b/src/pages/PasswordResetRequest.module.css
index b5fcf44..7b12a8b 100644
--- a/src/pages/PasswordResetRequest.module.css
+++ b/src/pages/PasswordResetRequest.module.css
@@ -1,16 +1,21 @@
 .container {
   display: flex;
-  min-height: 100vh;
-
+  min-height: 100dvh;
   font-family: "DM Sans", sans-serif;
   color: var(--color-bg);
 }
 
+@supports not (min-height: 100dvh) {
+  .container {
+    min-height: 100vh;
+  }
+}
+
 .mainContent {
   flex: 1;
   display: flex;
   flex-direction: column;
-  padding: 3rem;
+  padding: 2.5rem 2rem;
   background-color: var(--color-bg);
 }
 
@@ -18,39 +23,28 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  width: 100%;
   flex: 1;
 }
 
-.logoText {
-  
-  font-size: 35px;
+.logo {
   display: flex;
+  justify-content: center;
   align-items: center;
-  letter-spacing: -0.5px;
-  font-weight: 200;
+  width: 100%;
 }
 
-.logoPower {
-  color: var(--color-text);
-}
-
-.logoOn {
-  color: var(--color-secondary);
-  font-weight: 700;
-}
-
-.logo img {
-  height: 40px;
+.logoImage {
+  height: 44px;
+  width: auto;
+  object-fit: contain;
 }
 
 .loginBox {
-
-
   background-color: var(--color-bg);
-  width: 25%;
+  width: min(100%, 460px);
   height: auto;
-
-  margin-top: 5%;
+  margin-top: 2rem;
   padding: 2rem;
 
   border-radius: 25px;
@@ -240,3 +234,41 @@ button:disabled {
 .infoMessage p {
   margin: 0;
 }
+
+@media (max-width: 768px) {
+  .mainContent {
+    padding: 1rem;
+  }
+
+  .logoImage {
+    height: 40px;
+  }
+
+  .loginBox {
+    width: 100%;
+    margin-top: 1.25rem;
+    padding: 1.25rem;
+    border-radius: 20px;
+  }
+
+  .registerLink {
+    flex-wrap: wrap;
+    text-align: center;
+  }
+}
+
+@media (max-width: 420px) {
+  .mainContent {
+    padding: 0.75rem;
+  }
+
+  .loginBox {
+    padding: 1rem;
+    border-radius: 16px;
+  }
+
+  .input,
+  .button {
+    height: 48px;
+  }
+}
diff --git a/src/pages/PasswordResetRequest.tsx b/src/pages/PasswordResetRequest.tsx
index 6923655..74e4bc0 100644
--- a/src/pages/PasswordResetRequest.tsx
+++ b/src/pages/PasswordResetRequest.tsx
@@ -54,10 +54,11 @@ function PasswordResetRequest() {
     <div className={styles.container}>
       <div className={styles.mainContent}>
         <div className={styles.logo}>
-          <div className={styles.logoText}>
-            <span className={styles.logoPower}>Power</span>
-            <span className={styles.logoOn}>On</span>
-          </div>
+          <img
+            src="/logos/poweron-logo.png"
+            alt="PowerOn"
+            className={styles.logoImage}
+          />
         </div>
         <div className={styles.loginSection}>
           <div className={styles.loginBox}>
diff --git a/src/pages/Register.module.css b/src/pages/Register.module.css
index e42373d..a0350a7 100644
--- a/src/pages/Register.module.css
+++ b/src/pages/Register.module.css
@@ -1,16 +1,21 @@
 .container {
   display: flex;
-  min-height: 100vh;
-
+  min-height: 100dvh;
   font-family: "DM Sans", sans-serif;
   color: var(--color-bg);
 }
 
+@supports not (min-height: 100dvh) {
+  .container {
+    min-height: 100vh;
+  }
+}
+
 .mainContent {
   flex: 1;
   display: flex;
   flex-direction: column;
-  padding: 3rem;
+  padding: 2.5rem 2rem;
   background-color: var(--color-bg);
 }
 
@@ -18,39 +23,28 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  width: 100%;
   flex: 1;
 }
 
-.logoText {
-  
-  font-size: 35px;
+.logo {
   display: flex;
+  justify-content: center;
   align-items: center;
-  letter-spacing: -0.5px;
-  font-weight: 200;
+  width: 100%;
 }
 
-.logoPower {
-  color: var(--color-text);
-}
-
-.logoOn {
-  color: var(--color-secondary);
-  font-weight: 700;
-}
-
-.logo img {
-  height: 40px;
+.logoImage {
+  height: 44px;
+  width: auto;
+  object-fit: contain;
 }
 
 .loginBox {
-
-
   background-color: var(--color-bg);
-  width: 25%;
+  width: min(100%, 460px);
   height: auto;
-
-  margin-top: 5%;
+  margin-top: 2rem;
   padding: 2rem;
 
   border-radius: 25px;
@@ -273,3 +267,41 @@ button:disabled {
 .infoMessage p {
   margin: 0;
 }
+
+@media (max-width: 768px) {
+  .mainContent {
+    padding: 1rem;
+  }
+
+  .logoImage {
+    height: 40px;
+  }
+
+  .loginBox {
+    width: 100%;
+    margin-top: 1.25rem;
+    padding: 1.25rem;
+    border-radius: 20px;
+  }
+
+  .registerLink {
+    flex-wrap: wrap;
+    text-align: center;
+  }
+}
+
+@media (max-width: 420px) {
+  .mainContent {
+    padding: 0.75rem;
+  }
+
+  .loginBox {
+    padding: 1rem;
+    border-radius: 16px;
+  }
+
+  .input,
+  .button {
+    height: 48px;
+  }
+}
diff --git a/src/pages/Register.tsx b/src/pages/Register.tsx
index a3c1403..8c71330 100644
--- a/src/pages/Register.tsx
+++ b/src/pages/Register.tsx
@@ -137,10 +137,11 @@ function Register() {
     <div className={styles.container}>
       <div className={styles.mainContent}>
         <div className={styles.logo}>
-          <div className={styles.logoText}>
-            <span className={styles.logoPower}>Power</span>
-            <span className={styles.logoOn}>On</span>
-          </div>
+          <img
+            src="/logos/poweron-logo.png"
+            alt="PowerOn"
+            className={styles.logoImage}
+          />
         </div>
         <div className={styles.loginSection}>
           <div className={styles.loginBox}>
diff --git a/src/pages/Reset.module.css b/src/pages/Reset.module.css
index 401c409..18bda8b 100644
--- a/src/pages/Reset.module.css
+++ b/src/pages/Reset.module.css
@@ -1,16 +1,21 @@
 .container {
   display: flex;
-  min-height: 100vh;
-
+  min-height: 100dvh;
   font-family: "DM Sans", sans-serif;
   color: var(--color-bg);
 }
 
+@supports not (min-height: 100dvh) {
+  .container {
+    min-height: 100vh;
+  }
+}
+
 .mainContent {
   flex: 1;
   display: flex;
   flex-direction: column;
-  padding: 3rem;
+  padding: 2.5rem 2rem;
   background-color: var(--color-bg);
 }
 
@@ -18,39 +23,28 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  width: 100%;
   flex: 1;
 }
 
-.logoText {
-  
-  font-size: 35px;
+.logo {
   display: flex;
+  justify-content: center;
   align-items: center;
-  letter-spacing: -0.5px;
-  font-weight: 200;
+  width: 100%;
 }
 
-.logoPower {
-  color: var(--color-text);
-}
-
-.logoOn {
-  color: var(--color-secondary);
-  font-weight: 700;
-}
-
-.logo img {
-  height: 40px;
+.logoImage {
+  height: 44px;
+  width: auto;
+  object-fit: contain;
 }
 
 .loginBox {
-
-
   background-color: var(--color-bg);
-  width: 25%;
+  width: min(100%, 460px);
   height: auto;
-
-  margin-top: 5%;
+  margin-top: 2rem;
   padding: 2rem;
 
   border-radius: 25px;
@@ -234,3 +228,41 @@ button:disabled {
   font-family: var(--font-family);
   margin-bottom: 10px;
 }
+
+@media (max-width: 768px) {
+  .mainContent {
+    padding: 1rem;
+  }
+
+  .logoImage {
+    height: 40px;
+  }
+
+  .loginBox {
+    width: 100%;
+    margin-top: 1.25rem;
+    padding: 1.25rem;
+    border-radius: 20px;
+  }
+
+  .registerLink {
+    flex-wrap: wrap;
+    text-align: center;
+  }
+}
+
+@media (max-width: 420px) {
+  .mainContent {
+    padding: 0.75rem;
+  }
+
+  .loginBox {
+    padding: 1rem;
+    border-radius: 16px;
+  }
+
+  .input,
+  .button {
+    height: 48px;
+  }
+}
diff --git a/src/pages/Reset.tsx b/src/pages/Reset.tsx
index 617ef01..6f9eb1a 100644
--- a/src/pages/Reset.tsx
+++ b/src/pages/Reset.tsx
@@ -96,10 +96,11 @@ function Reset() {
       <div className={styles.container}>
         <div className={styles.mainContent}>
           <div className={styles.logo}>
-            <div className={styles.logoText}>
-              <span className={styles.logoPower}>Power</span>
-              <span className={styles.logoOn}>On</span>
-            </div>
+            <img
+              src="/logos/poweron-logo.png"
+              alt="PowerOn"
+              className={styles.logoImage}
+            />
           </div>
           <div className={styles.loginSection}>
             <div className={styles.loginBox}>
@@ -135,10 +136,11 @@ function Reset() {
     <div className={styles.container}>
       <div className={styles.mainContent}>
         <div className={styles.logo}>
-          <div className={styles.logoText}>
-            <span className={styles.logoPower}>Power</span>
-            <span className={styles.logoOn}>On</span>
-          </div>
+          <img
+            src="/logos/poweron-logo.png"
+            alt="PowerOn"
+            className={styles.logoImage}
+          />
         </div>
         <div className={styles.loginSection}>
           <div className={styles.loginBox}>
diff --git a/src/pages/views/workspace/WorkspaceInput.tsx b/src/pages/views/workspace/WorkspaceInput.tsx
index 6ff1095..b400553 100644
--- a/src/pages/views/workspace/WorkspaceInput.tsx
+++ b/src/pages/views/workspace/WorkspaceInput.tsx
@@ -44,6 +44,7 @@ interface WorkspaceInputProps {
   uploading?: boolean;
   selectedProviders?: string[];
   onProvidersChange?: (providers: string[]) => void;
+  isMobile?: boolean;
 }
 
 export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
@@ -59,6 +60,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
   uploading = false,
   selectedProviders = [],
   onProvidersChange,
+  isMobile = false,
 }) => {
   const [prompt, setPrompt] = useState('');
   const [showAutocomplete, setShowAutocomplete] = useState(false);
@@ -267,6 +269,8 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
     : [];
 
   const hasAttachments = attachedFileIds.length > 0 || attachedDataSourceIds.length > 0;
+  const _horizontalPadding = isMobile ? 12 : 24;
+  const _controlSize = isMobile ? 38 : 40;
 
   return (
     <div style={{
@@ -277,7 +281,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
       {/* Pending uploaded files */}
       {pendingFiles.length > 0 && (
         <div style={{
-          padding: '6px 24px',
+          padding: `6px ${_horizontalPadding}px`,
           display: 'flex',
           gap: 6,
           flexWrap: 'wrap',
@@ -314,7 +318,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
       {/* Attachment bar */}
       {hasAttachments && (
         <div style={{
-          padding: '6px 24px',
+          padding: `6px ${_horizontalPadding}px`,
           display: 'flex',
           gap: 6,
           flexWrap: 'wrap',
@@ -377,8 +381,8 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
         <div style={{
           position: 'absolute',
           bottom: '100%',
-          left: 24,
-          right: 24,
+          left: _horizontalPadding,
+          right: _horizontalPadding,
           maxHeight: 200,
           overflowY: 'auto',
           background: '#fff',
@@ -410,7 +414,13 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
       )}
 
       {/* Main input row */}
-      <div style={{ padding: '8px 24px 12px', display: 'flex', gap: 8, alignItems: 'flex-end' }}>
+      <div style={{
+        padding: `8px ${_horizontalPadding}px 12px`,
+        display: 'flex',
+        gap: 8,
+        alignItems: isMobile ? 'stretch' : 'flex-end',
+        flexWrap: isMobile ? 'wrap' : 'nowrap',
+      }}>
         <textarea
           ref={textareaRef}
           value={prompt}
@@ -420,7 +430,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
           disabled={isProcessing}
           style={{
             flex: 1,
-            minHeight: 40,
+            minHeight: isMobile ? 44 : 40,
             maxHeight: 120,
             resize: 'vertical',
             padding: '10px 14px',
@@ -429,6 +439,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
             fontSize: 14,
             fontFamily: 'inherit',
             outline: 'none',
+            flexBasis: isMobile ? '100%' : undefined,
           }}
           rows={1}
         />
@@ -438,7 +449,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
           disabled={uploading || isProcessing}
           title="Datei anhängen"
           style={{
-            width: 40, height: 40, borderRadius: 8, border: '1px solid var(--border-color, #ddd)',
+            width: _controlSize, height: _controlSize, borderRadius: 8, border: '1px solid var(--border-color, #ddd)',
             background: 'var(--secondary-bg, #f5f5f5)',
             color: uploading ? '#1976d2' : '#666',
             cursor: uploading || isProcessing ? 'not-allowed' : 'pointer',
@@ -456,7 +467,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
               disabled={isProcessing}
               title="Datenquellen anhängen"
               style={{
-                width: 40, height: 40, borderRadius: 8, border: '1px solid var(--border-color, #ddd)',
+                width: _controlSize, height: _controlSize, borderRadius: 8, border: '1px solid var(--border-color, #ddd)',
                 background: attachedDataSourceIds.length > 0 ? '#e8f5e9' : 'var(--secondary-bg, #f5f5f5)',
                 color: attachedDataSourceIds.length > 0 ? '#2e7d32' : '#666',
                 cursor: isProcessing ? 'not-allowed' : 'pointer',
@@ -536,7 +547,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
             onClick={() => setShowLangPicker(prev => !prev)}
             title="Sprache waehlen"
             style={{
-              height: 40, borderRadius: '8px 0 0 8px', border: '1px solid var(--border-color, #ddd)',
+              height: _controlSize, borderRadius: '8px 0 0 8px', border: '1px solid var(--border-color, #ddd)',
               borderRight: 'none',
               background: 'var(--secondary-bg, #f5f5f5)',
               color: '#666', cursor: 'pointer', fontSize: 10, padding: '0 6px',
@@ -549,7 +560,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
             onClick={_toggleVoice}
             title={voiceActive ? 'Aufnahme stoppen' : 'Sprachaufnahme starten'}
             style={{
-              width: 40, height: 40, borderRadius: '0 8px 8px 0', border: 'none',
+              width: _controlSize, height: _controlSize, borderRadius: '0 8px 8px 0', border: 'none',
               background: voiceActive ? '#f44336' : 'var(--secondary-bg, #f5f5f5)',
               color: voiceActive ? '#fff' : '#666',
               cursor: 'pointer', fontSize: 18, display: 'flex', alignItems: 'center', justifyContent: 'center',
@@ -589,6 +600,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
             style={{
               padding: '10px 20px', borderRadius: 8, border: 'none',
               background: '#f44336', color: '#fff', cursor: 'pointer', fontWeight: 600,
+              minWidth: isMobile ? 84 : undefined,
             }}
           >
             Stop
@@ -601,6 +613,7 @@ export const WorkspaceInput: React.FC<WorkspaceInputProps> = ({
               padding: '10px 20px', borderRadius: 8, border: 'none',
               background: prompt.trim() ? 'var(--primary-color, #1976d2)' : '#ccc',
               color: '#fff', cursor: prompt.trim() ? 'pointer' : 'default', fontWeight: 600,
+              minWidth: isMobile ? 84 : undefined,
             }}
           >
             Send
diff --git a/src/pages/views/workspace/WorkspacePage.tsx b/src/pages/views/workspace/WorkspacePage.tsx
index 1addeac..af21548 100644
--- a/src/pages/views/workspace/WorkspacePage.tsx
+++ b/src/pages/views/workspace/WorkspacePage.tsx
@@ -7,7 +7,7 @@
  *   Right sidebar: FilePreview, ToolActivityLog
  */
 
-import React, { useState, useCallback, useRef } from 'react';
+import React, { useState, useCallback, useRef, useEffect } from 'react';
 import { useCurrentInstance } from '../../../hooks/useCurrentInstance';
 import { useFileOperations } from '../../../hooks/useFiles';
 import { useWorkspace } from './useWorkspace';
@@ -80,6 +80,27 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
   const [isDragOver, setIsDragOver] = useState(false);
   const dragCounterRef = useRef(0);
   const fileInputRef = useRef<HTMLInputElement>(null);
+  const [isMobile, setIsMobile] = useState<boolean>(() =>
+    typeof window !== 'undefined' ? window.innerWidth <= 1024 : false,
+  );
+  const [mobileLeftOpen, setMobileLeftOpen] = useState(false);
+  const [mobileRightOpen, setMobileRightOpen] = useState(false);
+
+  useEffect(() => {
+    const _handleResize = () => {
+      setIsMobile(window.innerWidth <= 1024);
+    };
+    _handleResize();
+    window.addEventListener('resize', _handleResize);
+    return () => window.removeEventListener('resize', _handleResize);
+  }, []);
+
+  useEffect(() => {
+    if (!isMobile) {
+      setMobileLeftOpen(false);
+      setMobileRightOpen(false);
+    }
+  }, [isMobile]);
 
   const _uploadAndAttach = useCallback(async (file: File) => {
     const result = await fileOps.handleFileUpload(file, undefined, instanceId);
@@ -147,6 +168,9 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
     setSelectedFileId(fileId);
     setRightTab('preview');
     setRightCollapsed(false);
+    if (isMobile) {
+      setMobileRightOpen(true);
+    }
   };
 
   const _handleConversationSelect = (wfId: string) => {
@@ -166,10 +190,74 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
     textTransform: 'uppercase' as const,
   });
 
+  const _leftPanelBody = (
+    <>
+      <div style={{ display: 'flex', borderBottom: '1px solid var(--border-color, #e0e0e0)' }}>
+        <button style={tabButtonStyle(leftTab === 'conversations')} onClick={() => setLeftTab('conversations')}>Chats</button>
+        <button style={tabButtonStyle(leftTab === 'files')} onClick={() => setLeftTab('files')}>Files</button>
+        <button style={tabButtonStyle(leftTab === 'datasources')} onClick={() => setLeftTab('datasources')}>Sources</button>
+      </div>
+
+      <div style={{ flex: 1, overflow: 'auto' }}>
+        {leftTab === 'conversations' && (
+          <ConversationList
+            instanceId={instanceId}
+            activeWorkflowId={workspace.workflowId}
+            onSelect={_handleConversationSelect}
+            onCreateNew={workspace.resetToNew}
+            refreshTrigger={workspace.workflowVersion}
+          />
+        )}
+        {leftTab === 'files' && (
+          <FileBrowser
+            instanceId={instanceId}
+            files={workspace.files}
+            folders={workspace.folders}
+            onRefresh={workspace.refreshFiles}
+            onFileSelect={_handleFileSelect}
+          />
+        )}
+        {leftTab === 'datasources' && (
+          <DataSourcePanel
+            instanceId={instanceId}
+            dataSources={workspace.dataSources}
+            onRefresh={workspace.refreshDataSources}
+          />
+        )}
+      </div>
+    </>
+  );
+
+  const _rightPanelBody = (
+    <>
+      <div style={{ padding: '6px 12px', borderBottom: '1px solid var(--border-color, #e0e0e0)', display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+        <div style={{ display: 'flex', gap: 8 }}>
+          <button style={tabButtonStyle(rightTab === 'activity')} onClick={() => setRightTab('activity')}>Activity</button>
+          <button style={tabButtonStyle(rightTab === 'preview')} onClick={() => setRightTab('preview')}>Preview</button>
+        </div>
+        {!isMobile && (
+          <button onClick={() => setRightCollapsed(true)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 14, color: '#888' }}>▶</button>
+        )}
+      </div>
+      <div style={{ flex: 1, overflow: 'auto' }}>
+        {rightTab === 'activity' && (
+          <ToolActivityLog activities={workspace.toolActivities} />
+        )}
+        {rightTab === 'preview' && (
+          <FilePreview
+            instanceId={instanceId}
+            fileId={selectedFileId}
+            files={workspace.files}
+          />
+        )}
+      </div>
+    </>
+  );
+
   return (
-    <div style={{ display: 'flex', flex: 1, minHeight: 0, overflow: 'hidden' }}>
+    <div style={{ display: 'flex', flex: 1, minHeight: 0, overflow: 'hidden', position: 'relative' }}>
       {/* Left sidebar */}
-      {!leftCollapsed && (
+      {!isMobile && !leftCollapsed && (
         <aside style={{
           width: _leftResize.width,
           minWidth: 200,
@@ -183,45 +271,12 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
             <span style={{ fontWeight: 600, fontSize: 14 }}>Workspace</span>
             <button onClick={() => setLeftCollapsed(true)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 14, color: '#888' }}>◀</button>
           </div>
-
-          <div style={{ display: 'flex', borderBottom: '1px solid var(--border-color, #e0e0e0)' }}>
-            <button style={tabButtonStyle(leftTab === 'conversations')} onClick={() => setLeftTab('conversations')}>Chats</button>
-            <button style={tabButtonStyle(leftTab === 'files')} onClick={() => setLeftTab('files')}>Files</button>
-            <button style={tabButtonStyle(leftTab === 'datasources')} onClick={() => setLeftTab('datasources')}>Sources</button>
-          </div>
-
-          <div style={{ flex: 1, overflow: 'auto' }}>
-            {leftTab === 'conversations' && (
-              <ConversationList
-                instanceId={instanceId}
-                activeWorkflowId={workspace.workflowId}
-                onSelect={_handleConversationSelect}
-                onCreateNew={workspace.resetToNew}
-                refreshTrigger={workspace.workflowVersion}
-              />
-            )}
-            {leftTab === 'files' && (
-              <FileBrowser
-                instanceId={instanceId}
-                files={workspace.files}
-                folders={workspace.folders}
-                onRefresh={workspace.refreshFiles}
-                onFileSelect={_handleFileSelect}
-              />
-            )}
-            {leftTab === 'datasources' && (
-              <DataSourcePanel
-                instanceId={instanceId}
-                dataSources={workspace.dataSources}
-                onRefresh={workspace.refreshDataSources}
-              />
-            )}
-          </div>
+          {_leftPanelBody}
         </aside>
       )}
 
       {/* Left resize handle */}
-      {!leftCollapsed && (
+      {!isMobile && !leftCollapsed && (
         <div
           onMouseDown={e => _leftResize.onMouseDown(e, 1)}
           style={{ width: 4, cursor: 'col-resize', background: 'transparent', flexShrink: 0 }}
@@ -230,7 +285,7 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
         />
       )}
 
-      {leftCollapsed && (
+      {!isMobile && leftCollapsed && (
         <div style={{ width: 32, display: 'flex', alignItems: 'start', justifyContent: 'center', paddingTop: 8, borderRight: '1px solid var(--border-color, #e0e0e0)' }}>
           <button onClick={() => setLeftCollapsed(false)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 14, color: '#888' }}>▶</button>
         </div>
@@ -247,6 +302,57 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
         onDragOver={_handleDragOver}
         onDrop={_handleDrop}
       >
+        {isMobile && (
+          <div style={{
+            display: 'flex',
+            gap: 8,
+            padding: '8px 12px',
+            borderBottom: '1px solid var(--border-color, #e0e0e0)',
+            background: 'var(--bg-primary, #fff)',
+            flexWrap: 'wrap',
+          }}>
+            <button
+              onClick={() => setMobileLeftOpen(true)}
+              style={{
+                padding: '6px 10px',
+                borderRadius: 8,
+                border: '1px solid var(--border-color, #ddd)',
+                background: '#f7f7f7',
+                cursor: 'pointer',
+                fontSize: 12,
+                fontWeight: 600,
+              }}
+            >
+              Workspace
+            </button>
+            <button
+              onClick={() => { setRightTab('activity'); setMobileRightOpen(true); }}
+              style={{
+                padding: '6px 10px',
+                borderRadius: 8,
+                border: '1px solid var(--border-color, #ddd)',
+                background: rightTab === 'activity' ? '#e8f3ff' : '#f7f7f7',
+                cursor: 'pointer',
+                fontSize: 12,
+              }}
+            >
+              Activity
+            </button>
+            <button
+              onClick={() => { setRightTab('preview'); setMobileRightOpen(true); }}
+              style={{
+                padding: '6px 10px',
+                borderRadius: 8,
+                border: '1px solid var(--border-color, #ddd)',
+                background: rightTab === 'preview' ? '#e8f3ff' : '#f7f7f7',
+                cursor: 'pointer',
+                fontSize: 12,
+              }}
+            >
+              Preview
+            </button>
+          </div>
+        )}
         {isDragOver && (
           <div style={{
             position: 'absolute', inset: 0, zIndex: 100,
@@ -284,11 +390,12 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
           uploading={fileOps.uploadingFile}
           selectedProviders={selectedProviders}
           onProvidersChange={setSelectedProviders}
+          isMobile={isMobile}
         />
       </main>
 
       {/* Right resize handle */}
-      {!rightCollapsed && (
+      {!isMobile && !rightCollapsed && (
         <div
           onMouseDown={e => _rightResize.onMouseDown(e, -1)}
           style={{ width: 4, cursor: 'col-resize', background: 'transparent', flexShrink: 0 }}
@@ -298,7 +405,7 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
       )}
 
       {/* Right sidebar */}
-      {!rightCollapsed && (
+      {!isMobile && !rightCollapsed && (
         <aside style={{
           width: _rightResize.width,
           minWidth: 200,
@@ -308,33 +415,82 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
           overflow: 'hidden',
           flexShrink: 0,
         }}>
-          <div style={{ padding: '6px 12px', borderBottom: '1px solid var(--border-color, #e0e0e0)', display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
-            <div style={{ display: 'flex', gap: 8 }}>
-              <button style={tabButtonStyle(rightTab === 'activity')} onClick={() => setRightTab('activity')}>Activity</button>
-              <button style={tabButtonStyle(rightTab === 'preview')} onClick={() => setRightTab('preview')}>Preview</button>
-            </div>
-            <button onClick={() => setRightCollapsed(true)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 14, color: '#888' }}>▶</button>
-          </div>
-          <div style={{ flex: 1, overflow: 'auto' }}>
-            {rightTab === 'activity' && (
-              <ToolActivityLog activities={workspace.toolActivities} />
-            )}
-            {rightTab === 'preview' && (
-              <FilePreview
-                instanceId={instanceId}
-                fileId={selectedFileId}
-                files={workspace.files}
-              />
-            )}
-          </div>
+          {_rightPanelBody}
         </aside>
       )}
 
-      {rightCollapsed && (
+      {!isMobile && rightCollapsed && (
         <div style={{ width: 32, display: 'flex', alignItems: 'start', justifyContent: 'center', paddingTop: 8, borderLeft: '1px solid var(--border-color, #e0e0e0)' }}>
           <button onClick={() => setRightCollapsed(false)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 14, color: '#888' }}>◀</button>
         </div>
       )}
+
+      {isMobile && mobileLeftOpen && (
+        <div
+          style={{
+            position: 'absolute',
+            inset: 0,
+            background: 'rgba(0, 0, 0, 0.35)',
+            zIndex: 120,
+            display: 'flex',
+          }}
+          onClick={() => setMobileLeftOpen(false)}
+        >
+          <aside
+            style={{
+              width: '100%',
+              maxWidth: 460,
+              height: '100%',
+              background: 'var(--bg-primary, #fff)',
+              borderRight: '1px solid var(--border-color, #e0e0e0)',
+              display: 'flex',
+              flexDirection: 'column',
+              overflow: 'hidden',
+            }}
+            onClick={e => e.stopPropagation()}
+          >
+            <div style={{ padding: '10px 12px', borderBottom: '1px solid var(--border-color, #e0e0e0)', display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+              <span style={{ fontWeight: 600, fontSize: 14 }}>Workspace</span>
+              <button onClick={() => setMobileLeftOpen(false)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 18, color: '#666' }}>×</button>
+            </div>
+            {_leftPanelBody}
+          </aside>
+        </div>
+      )}
+
+      {isMobile && mobileRightOpen && (
+        <div
+          style={{
+            position: 'absolute',
+            inset: 0,
+            background: 'rgba(0, 0, 0, 0.35)',
+            zIndex: 120,
+            display: 'flex',
+            justifyContent: 'flex-end',
+          }}
+          onClick={() => setMobileRightOpen(false)}
+        >
+          <aside
+            style={{
+              width: '100%',
+              maxWidth: 460,
+              height: '100%',
+              background: 'var(--bg-primary, #fff)',
+              borderLeft: '1px solid var(--border-color, #e0e0e0)',
+              display: 'flex',
+              flexDirection: 'column',
+              overflow: 'hidden',
+            }}
+            onClick={e => e.stopPropagation()}
+          >
+            <div style={{ padding: '10px 12px', borderBottom: '1px solid var(--border-color, #e0e0e0)', display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
+              <span style={{ fontWeight: 600, fontSize: 14 }}>{rightTab === 'activity' ? 'Activity' : 'Preview'}</span>
+              <button onClick={() => setMobileRightOpen(false)} style={{ background: 'none', border: 'none', cursor: 'pointer', fontSize: 18, color: '#666' }}>×</button>
+            </div>
+            {_rightPanelBody}
+          </aside>
+        </div>
+      )}
     </div>
   );
 };