diff --git a/app/frontend/.agents/task.md b/app/frontend/.agents/task.md
new file mode 100644
index 0000000..9d32aed
--- /dev/null
+++ b/app/frontend/.agents/task.md
@@ -0,0 +1,13 @@
+- [x] Rearrange composer JSX in `TextChat.jsx` to stack the textarea at the top and the action buttons in a separate toolbar at the bottom.
+- [x] Refactor composer styles in `App.css` to align with the vertical stack layout, ensuring full-width textarea and proper spacing.
+- [x] Remove obsolete `margin-bottom: 2px` properties from action buttons and center them vertically in the toolbar.
+- [x] Implement sidebar visibility toggle state in `App.jsx` and persist state to `localStorage`.
+- [x] Add sidebar collapse transitions and `.sidebar.collapsed` styles in `App.css`.
+- [x] Integrate left sidebar toggle button in `TopStatusBar.jsx` using `PanelLeft`/`PanelLeftClose` Lucide icons.
+- [x] Set AI/assistant chat bubble wrap max-width to `80%` in `App.css` to improve text readability and prevent wide stretching.
+- [x] Implement global font size state in `App.jsx` and synchronize it to a CSS custom variable `--app-font-size` on the html element.
+- [x] Refactor body font-size to use relative `1rem` in `App.css` to enable page-wide scaling.
+- [x] Add a Font Size range slider to the "Appearance & Themes" section in `Settings.jsx` to adjust text size from 12px to 24px.
+- [x] Fix dropdown overlay menu readability issues in `App.css` by using a solid color-mix base (blending transparent surface with solid background) and forcing strong `backdrop-filter: blur(20px)` to prevent underlying text/icon bleeding.
+- [x] Merge "Color Themes" and "Text & Interface Size" subsections in `Settings.jsx` into a single unified card container separated by a horizontal divider line.
+- [x] Test production build using `npm run build` to verify there are no compilation or syntax errors.
diff --git a/app/frontend/src/App.css b/app/frontend/src/App.css
index 72a7649..f690d08 100644
--- a/app/frontend/src/App.css
+++ b/app/frontend/src/App.css
@@ -1,5 +1,6 @@
 /* Modern Minimalist & Glassmorphism Design System */
 :root {
+  --app-font-size: 16px;
   font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
   font-synthesis: none;
   text-rendering: optimizeLegibility;
@@ -50,6 +51,10 @@
   --glass-blur: blur(16px);
 }
 
+html {
+  font-size: var(--app-font-size);
+}
+
 /* Dark Theme Variables */
 html[data-theme="dark"] {
   --md-sys-color-primary: #6366f1;
@@ -282,12 +287,12 @@ html[data-theme="dark-oled"] body {
   top: 40px;
   right: 0;
   width: 190px;
-  background: var(--md-sys-color-surface);
-  backdrop-filter: var(--glass-blur);
-  -webkit-backdrop-filter: var(--glass-blur);
+  background: color-mix(in srgb, var(--md-sys-color-surface) 40%, var(--md-sys-color-background));
+  backdrop-filter: blur(20px) !important;
+  -webkit-backdrop-filter: blur(20px) !important;
   border: 1px solid var(--border-color);
   border-radius: var(--md-shape-corner-medium);
-  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
+  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
   padding: 6px;
   display: flex;
   flex-direction: column;
@@ -385,7 +390,7 @@ body {
   overflow: hidden;
   height: 100vh;
   width: 100vw;
-  font-size: 16px;
+  font-size: 1rem;
   transition: background-color var(--md-transition-duration) ease;
 }
 
@@ -414,6 +419,16 @@ body {
   transition: all var(--md-transition-duration) var(--md-transition-easing);
 }
 
+.sidebar.collapsed {
+  width: 0 !important;
+  padding-left: 0 !important;
+  padding-right: 0 !important;
+  border-right-color: transparent !important;
+  opacity: 0;
+  pointer-events: none;
+  overflow: hidden;
+}
+
 .sidebar-logo {
   display: flex;
   align-items: center;
@@ -744,7 +759,7 @@ body {
 
 .chat-message-row.ai .chat-bubble-wrap {
   align-items: flex-start;
-  max-width: min(1520px, calc(100% - 42px));
+  max-width: 80%;
 }
 
 .chat-bubble {
@@ -1209,8 +1224,9 @@ body {
   min-width: 280px;
   max-height: 280px;
   overflow-y: auto;
-  background: color-mix(in srgb, var(--md-sys-color-surface) 95%, black);
-  backdrop-filter: blur(16px);
+  background: color-mix(in srgb, var(--md-sys-color-surface) 40%, var(--md-sys-color-background));
+  backdrop-filter: blur(20px) !important;
+  -webkit-backdrop-filter: blur(20px) !important;
   border: 1px solid var(--border-color);
   border-radius: 12px;
   box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
@@ -1384,6 +1400,28 @@ body {
   box-shadow: var(--glass-shadow);
 }
 
+.sidebar-toggle-btn {
+  background: var(--md-sys-color-surface-variant);
+  border: 1px solid var(--border-color);
+  color: var(--md-sys-color-on-surface-variant);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  border-radius: var(--md-shape-corner-medium);
+  transition: all var(--md-transition-duration) var(--md-transition-easing);
+  flex-shrink: 0;
+}
+
+.sidebar-toggle-btn:hover {
+  color: var(--md-sys-color-primary);
+  border-color: var(--md-sys-color-primary);
+  background-color: var(--md-sys-color-primary-container);
+  transform: scale(1.05);
+}
+
 .current-model-info {
   display: flex;
   align-items: center;
diff --git a/app/frontend/src/App.jsx b/app/frontend/src/App.jsx
index 0b44307..de89a38 100644
--- a/app/frontend/src/App.jsx
+++ b/app/frontend/src/App.jsx
@@ -214,6 +214,24 @@ function App() {
   const [conversations, setConversations] = useState([]);
   const [activeConversationId, setActiveConversationId] = useState(null);
   const [showHistory, setShowHistory] = useState(false); // Default hide
+  const [sidebarVisible, setSidebarVisible] = useState(() => {
+    const saved = localStorage.getItem("sidebarVisible");
+    return saved !== "false";
+  });
+
+  useEffect(() => {
+    localStorage.setItem("sidebarVisible", String(sidebarVisible));
+  }, [sidebarVisible]);
+
+  const [fontSize, setFontSize] = useState(() => {
+    const saved = localStorage.getItem("fontSize");
+    return saved ? Number(saved) : 16;
+  });
+
+  useEffect(() => {
+    document.documentElement.style.setProperty("--app-font-size", `${fontSize}px`);
+    localStorage.setItem("fontSize", String(fontSize));
+  }, [fontSize]);
   const [speechTranscriptions, setSpeechTranscriptions] = useState([]);
   const [selectedSpeechTranscript, setSelectedSpeechTranscript] = useState(null);
   const [showSpeechHistory, setShowSpeechHistory] = useState(false);
@@ -623,6 +641,7 @@ function App() {
 
   const sidebarContent = useMemo(() => (
     <Sidebar
+      collapsed={!sidebarVisible}
       activeTab={activeTab}
       setActiveTab={setActiveTab}
       specs={specs}
@@ -645,7 +664,7 @@ function App() {
       setShowTtsHistory={setShowTtsHistory}
       onDeleteTtsOutput={handleDeleteTtsOutput}
     />
-  ), [activeTab, specs, conversations, activeConversationId, showHistory, handleDeleteConversation, speechTranscriptions, selectedSpeechTranscript, showSpeechHistory, handleDeleteSpeechTranscription, ttsOutputs, selectedTtsOutput, showTtsHistory, handleDeleteTtsOutput]);
+  ), [sidebarVisible, activeTab, specs, conversations, activeConversationId, showHistory, handleDeleteConversation, speechTranscriptions, selectedSpeechTranscript, showSpeechHistory, handleDeleteSpeechTranscription, ttsOutputs, selectedTtsOutput, showTtsHistory, handleDeleteTtsOutput]);
 
   const handleStopServer = useCallback(async () => {
     if (!serverRunning || isStoppingServer) return;
@@ -679,6 +698,8 @@ function App() {
           isStoppingServer={isStoppingServer}
           theme={theme}
           setTheme={setTheme}
+          sidebarVisible={sidebarVisible}
+          onToggleSidebar={() => setSidebarVisible(!sidebarVisible)}
         />
 
         {/* Dynamic Workspace Container */}
@@ -793,6 +814,8 @@ function App() {
             diagnosticsCopied={diagnosticsCopied}
             theme={theme}
             setTheme={setTheme}
+            fontSize={fontSize}
+            setFontSize={setFontSize}
           />
         </div>
       </div>
diff --git a/app/frontend/src/components/Settings.jsx b/app/frontend/src/components/Settings.jsx
index bd6413b..f6135e3 100644
--- a/app/frontend/src/components/Settings.jsx
+++ b/app/frontend/src/components/Settings.jsx
@@ -206,6 +206,14 @@ function SectionHeader({ icon: Icon, title, count, color, isExpanded, onToggle }
   );
 }
 
+const getSliderStyle = (value, min, max) => {
+  const v = Number(value);
+  const mn = Number(min);
+  const mx = Number(max);
+  const pct = mx === mn ? 0 : ((v - mn) / (mx - mn)) * 100;
+  return { "--value": `${pct}%` };
+};
+
 // ─── Main Settings Component ───
 function Settings({
   constraints,
@@ -234,6 +242,8 @@ function Settings({
   diagnosticsCopied,
   theme,
   setTheme,
+  fontSize,
+  setFontSize,
 }) {
   const [llmStatus, setLlmStatus] = useState({ ready: false, settings: {} });
   const [llmBackends, setLlmBackends] = useState({ available: [], candidates: [] });
@@ -704,6 +714,7 @@ function Settings({
                   onChange={(e) => updateConstraint("steps", parseInt(e.target.value))}
                   min="1"
                   max={isOpenVinoNpu ? "8" : "60"}
+                  style={getSliderStyle(constraints.steps, 1, isOpenVinoNpu ? 8 : 60)}
                 />
                 <span className="settings-option-desc">
                   {isOpenVinoNpu
@@ -912,6 +923,7 @@ function Settings({
                   min="0"
                   max="32768"
                   step="512"
+                  style={getSliderStyle(textSettings.contextSize || 0, 0, 32768)}
                 />
                 <span className="settings-option-desc">
                   Model memory limit. 0 uses default limit. (Recommended: 0)
@@ -940,6 +952,7 @@ function Settings({
                   min="0"
                   max="2"
                   step="0.1"
+                  style={getSliderStyle(textSettings.temperature, 0, 2)}
                 />
                 <span className="settings-option-desc">
                   Controls creativity. Lower = focused & factual, Higher = creative & diverse. (Recommended: 0.7)
@@ -978,6 +991,7 @@ function Settings({
                       min="64"
                       max="4096"
                       step="64"
+                      style={getSliderStyle(textSettings.maxTokens || 1024, 64, 4096)}
                     />
                     <span className="settings-option-desc">
                       Manual uses the slider value.
@@ -1045,6 +1059,7 @@ function Settings({
                   onChange={(e) => updateTextSetting("threads", parseInt(e.target.value))}
                   min="1"
                   max={specs?.cpu_cores_logical || 16}
+                  style={getSliderStyle(textSettings.threads || 4, 1, specs?.cpu_cores_logical || 16)}
                 />
               </div>
 
@@ -1063,6 +1078,7 @@ function Settings({
                   }}
                   min="0"
                   max="50"
+                  style={getSliderStyle(textSettings.gpuLayers === -1 ? 50 : textSettings.gpuLayers, 0, 50)}
                 />
                 <span className="settings-option-desc">
                   50 = All layers on GPU
@@ -1082,6 +1098,7 @@ function Settings({
                   min="64"
                   max="2048"
                   step="64"
+                  style={getSliderStyle(textSettings.batchSize || 512, 64, 2048)}
                 />
               </div>
 
@@ -1201,6 +1218,7 @@ function Settings({
                         onChange={(e) => updateSpeechSetting("threads", parseInt(e.target.value))}
                         min="1"
                         max={specs?.cpu_cores_logical || 16}
+                        style={getSliderStyle(speechSettings.threads || 4, 1, specs?.cpu_cores_logical || 16)}
                       />
                       <span className="settings-option-desc">
                         Number of threads to allocate for transcription. (Recommended: 4)
@@ -1309,6 +1327,7 @@ function Settings({
                       min="0.5"
                       max="2"
                       step="0.05"
+                      style={getSliderStyle(ttsSettings?.speed || 1, 0.5, 2)}
                     />
                     <span className="settings-option-desc">
                       1.00x is natural speed. Lower values are slower, higher values are faster.
@@ -1328,7 +1347,7 @@ function Settings({
       <SectionHeader 
         icon={Palette} 
         title="Appearance & Themes" 
-        count={THEMES.length}
+        count={2}
         color="var(--md-sys-color-primary)"
         isExpanded={expandedSections.appearance}
         onToggle={() => toggleSection("appearance")}
@@ -1336,74 +1355,107 @@ function Settings({
       
       {expandedSections.appearance && (
         <div className="settings-expanded-content">
-          <div className="settings-subsection" style={{ marginBottom: "28px" }}>
-        <div className="settings-subsection-title">
-          <Palette size={16} />
-          Color Themes
-        </div>
-        <div style={{
-          display: "grid",
-          gridTemplateColumns: "repeat(auto-fill, minmax(180px, 1fr))",
-          gap: "14px",
-          marginTop: "14px"
-        }}>
-          {THEMES.map((t) => {
-            const isActive = theme === t.id;
-            return (
-              <button
-                key={t.id}
-                onClick={() => setTheme(t.id)}
-                className={`theme-card-btn ${isActive ? "active" : ""}`}
-                style={{
-                  background: t.bg,
-                  color: t.type === "dark" ? "#f4f4f5" : "#0f172a",
-                  border: isActive ? "2px solid var(--md-sys-color-primary)" : "1px solid var(--border-color)",
-                  borderRadius: "14px",
-                  padding: "18px",
-                  textAlign: "left",
-                  cursor: "pointer",
-                  position: "relative",
-                  display: "flex",
-                  flexDirection: "column",
-                  gap: "14px",
-                  boxShadow: isActive ? "0 4px 16px color-mix(in srgb, var(--md-sys-color-primary) 25%, transparent)" : "none",
-                  transition: "all 0.25s ease",
-                }}
-              >
-                <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", width: "100%" }}>
-                  <span style={{ fontWeight: 700, fontSize: "0.88rem", letterSpacing: "-0.01em" }}>{t.name}</span>
-                  {isActive && (
-                    <div style={{
-                      background: "linear-gradient(135deg, var(--md-sys-color-primary), var(--md-sys-color-secondary))",
-                      color: "var(--md-sys-color-on-primary)",
-                      borderRadius: "50%",
-                      width: "22px",
-                      height: "22px",
+          <div className="settings-subsection">
+            {/* Color Themes Sub-section */}
+            <div className="settings-subsection-title">
+              <Palette size={16} />
+              Color Themes
+            </div>
+            <div style={{
+              display: "grid",
+              gridTemplateColumns: "repeat(auto-fill, minmax(180px, 1fr))",
+              gap: "14px",
+              marginTop: "14px"
+            }}>
+              {THEMES.map((t) => {
+                const isActive = theme === t.id;
+                return (
+                  <button
+                    key={t.id}
+                    onClick={() => setTheme(t.id)}
+                    className={`theme-card-btn ${isActive ? "active" : ""}`}
+                    style={{
+                      background: t.bg,
+                      color: t.type === "dark" ? "#f4f4f5" : "#0f172a",
+                      border: isActive ? "2px solid var(--md-sys-color-primary)" : "1px solid var(--border-color)",
+                      borderRadius: "14px",
+                      padding: "18px",
+                      textAlign: "left",
+                      cursor: "pointer",
+                      position: "relative",
                       display: "flex",
-                      alignItems: "center",
-                      justifyContent: "center",
-                      boxShadow: "0 2px 6px color-mix(in srgb, var(--md-sys-color-primary) 40%, transparent)"
-                    }}>
-                      <Check size={13} strokeWidth={3} />
+                      flexDirection: "column",
+                      gap: "14px",
+                      boxShadow: isActive ? "0 4px 16px color-mix(in srgb, var(--md-sys-color-primary) 25%, transparent)" : "none",
+                      transition: "all 0.25s ease",
+                    }}
+                  >
+                    <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", width: "100%" }}>
+                      <span style={{ fontWeight: 700, fontSize: "0.88rem", letterSpacing: "-0.01em" }}>{t.name}</span>
+                      {isActive && (
+                        <div style={{
+                          background: "linear-gradient(135deg, var(--md-sys-color-primary), var(--md-sys-color-secondary))",
+                          color: "var(--md-sys-color-on-primary)",
+                          borderRadius: "50%",
+                          width: "22px",
+                          height: "22px",
+                          display: "flex",
+                          alignItems: "center",
+                          justifyContent: "center",
+                          boxShadow: "0 2px 6px color-mix(in srgb, var(--md-sys-color-primary) 40%, transparent)"
+                        }}>
+                          <Check size={13} strokeWidth={3} />
+                        </div>
+                      )}
                     </div>
-                  )}
-                </div>
-                
-                {/* Preview circles for primary and secondary colors */}
-                <div style={{ display: "flex", gap: "8px", alignItems: "center" }}>
-                  <div style={{ width: "26px", height: "26px", borderRadius: "50%", background: t.primary, border: "2px solid rgba(255,255,255,0.25)", boxShadow: "0 2px 6px rgba(0,0,0,0.15)" }} title="Primary" />
-                  <div style={{ width: "26px", height: "26px", borderRadius: "50%", background: t.secondary, border: "2px solid rgba(255,255,255,0.25)", boxShadow: "0 2px 6px rgba(0,0,0,0.15)" }} title="Secondary" />
-                  <div style={{ width: "26px", height: "26px", borderRadius: "50%", background: t.bg, border: "1.5px solid rgba(0,0,0,0.12)", boxShadow: "inset 0 2px 4px rgba(0,0,0,0.06)" }} title="Background" />
-                  <span style={{ marginLeft: "auto", fontSize: "0.7rem", opacity: 0.6, fontWeight: 600, textTransform: "uppercase", letterSpacing: "0.04em" }}>
-                    {t.type}
-                  </span>
-                </div>
-              </button>
-            );
-          })}
+                    
+                    {/* Preview circles for primary and secondary colors */}
+                    <div style={{ display: "flex", gap: "8px", alignItems: "center" }}>
+                      <div style={{ width: "26px", height: "26px", borderRadius: "50%", background: t.primary, border: "2px solid rgba(255,255,255,0.25)", boxShadow: "0 2px 6px rgba(0,0,0,0.15)" }} title="Primary" />
+                      <div style={{ width: "26px", height: "26px", borderRadius: "50%", background: t.secondary, border: "2px solid rgba(255,255,255,0.25)", boxShadow: "0 2px 6px rgba(0,0,0,0.15)" }} title="Secondary" />
+                      <div style={{ width: "26px", height: "26px", borderRadius: "50%", background: t.bg, border: "1.5px solid rgba(0,0,0,0.12)", boxShadow: "inset 0 2px 4px rgba(0,0,0,0.06)" }} title="Background" />
+                      <span style={{ marginLeft: "auto", fontSize: "0.7rem", opacity: 0.6, fontWeight: 600, textTransform: "uppercase", letterSpacing: "0.04em" }}>
+                        {t.type}
+                      </span>
+                    </div>
+                  </button>
+                );
+              })}
+            </div>
+
+            {/* Divider separating sub-sections inside the single card */}
+            <div style={{
+              height: "1px",
+              background: "var(--border-color)",
+              margin: "24px 0"
+            }} />
+
+            {/* Text & Interface Size Sub-section */}
+            <div className="settings-subsection-title">
+              <Type size={16} />
+              Text & Interface Size
+            </div>
+            <div className="m3-slider-group" style={{ maxWidth: "480px", marginTop: "14px" }}>
+              <div className="m3-slider-header">
+                <span className="m3-slider-label">Font Size</span>
+                <span className="settings-value-badge">{fontSize || 16}px</span>
+              </div>
+              <input
+                type="range"
+                className="m3-slider"
+                value={fontSize || 16}
+                onChange={(e) => setFontSize(parseInt(e.target.value))}
+                min="12"
+                max="24"
+                step="1"
+                style={getSliderStyle(fontSize || 16, 12, 24)}
+              />
+              <span className="settings-option-desc">
+                Adjusts the global font size of the application text, including chat replies and settings labels. Default is 16px.
+              </span>
+            </div>
+          </div>
         </div>
-      </div>
-      </div>
       )}
     </>
   );
diff --git a/app/frontend/src/components/Sidebar.jsx b/app/frontend/src/components/Sidebar.jsx
index b3b60b3..89f898c 100644
--- a/app/frontend/src/components/Sidebar.jsx
+++ b/app/frontend/src/components/Sidebar.jsx
@@ -10,6 +10,7 @@ function formatSidebarDate(value) {
 }
 
 function Sidebar({ 
+  collapsed = false,
   activeTab, 
   setActiveTab, 
   specs,
@@ -33,7 +34,7 @@ function Sidebar({
   onDeleteTtsOutput
 }) {
   return (
-    <div className="sidebar">
+    <div className={`sidebar ${collapsed ? "collapsed" : ""}`}>
       <div>
         {/* Sidebar Header */}
         <div className="sidebar-logo">
diff --git a/app/frontend/src/components/TopStatusBar.jsx b/app/frontend/src/components/TopStatusBar.jsx
index 994989a..2cf9306 100644
--- a/app/frontend/src/components/TopStatusBar.jsx
+++ b/app/frontend/src/components/TopStatusBar.jsx
@@ -1,8 +1,19 @@
 import React, { memo, useState, useRef, useEffect } from "react";
-import { Cpu, HardDrive, Database, Square, RefreshCw, Sun, Moon, Palette, Check } from "lucide-react";
+import { Cpu, HardDrive, Database, Square, RefreshCw, Sun, Moon, Palette, Check, PanelLeftClose, PanelLeft } from "lucide-react";
 import { THEMES } from "../themes";
 
-function TopStatusBar({ telemetry, serverRunning, activeModel, isLlmLoaded = false, onStopServer, isStoppingServer = false, theme, setTheme }) {
+function TopStatusBar({ 
+  telemetry, 
+  serverRunning, 
+  activeModel, 
+  isLlmLoaded = false, 
+  onStopServer, 
+  isStoppingServer = false, 
+  theme, 
+  setTheme,
+  sidebarVisible,
+  onToggleSidebar
+}) {
   const [showThemeMenu, setShowThemeMenu] = useState(false);
   const menuRef = useRef(null);
 
@@ -40,19 +51,29 @@ function TopStatusBar({ telemetry, serverRunning, activeModel, isLlmLoaded = fal
 
   return (
     <div className="top-status-bar">
-      <div className="current-model-info">
-        <div className={getStatusClass()}></div>
-        <span style={{ fontWeight: 600, fontSize: "0.95rem" }}>
-          {getStatusText()}
-        </span>
-        {activeModel && (
-          <>
-            <span style={{ color: "var(--md-sys-color-outline-variant)" }}>|</span>
-            <span style={{ color: "var(--md-sys-color-primary)", fontWeight: 700 }}>
-              {activeModel}
-            </span>
-          </>
-        )}
+      <div style={{ display: "flex", alignItems: "center", gap: "10px" }}>
+        <button
+          onClick={onToggleSidebar}
+          className="sidebar-toggle-btn"
+          title={sidebarVisible ? "Collapse Sidebar" : "Expand Sidebar"}
+        >
+          {sidebarVisible ? <PanelLeftClose size={18} /> : <PanelLeft size={18} />}
+        </button>
+
+        <div className="current-model-info">
+          <div className={getStatusClass()}></div>
+          <span style={{ fontWeight: 600, fontSize: "0.95rem" }}>
+            {getStatusText()}
+          </span>
+          {activeModel && (
+            <>
+              <span style={{ color: "var(--md-sys-color-outline-variant)" }}>|</span>
+              <span style={{ color: "var(--md-sys-color-primary)", fontWeight: 700 }}>
+                {activeModel}
+              </span>
+            </>
+          )}
+        </div>
       </div>
 
       <div className="telemetry-group" style={{ position: "relative" }}>