diff --git a/static/script.js b/static/script.js
index 0a08ef2..277c2c1 100644
--- a/static/script.js
+++ b/static/script.js
@@ -8,6 +8,8 @@ const SETTINGS_STORAGE_KEY = 'gemini-image-app-settings';
 const ZOOM_STEP = 0.1;
 const MIN_ZOOM = 0.4;
 const MAX_ZOOM = 4;
+const SIDEBAR_MIN_WIDTH = 260;
+const SIDEBAR_MAX_WIDTH = 520;
 
 const infoContent = {
     title: 'Thông tin',
@@ -47,9 +49,13 @@ const docsContent = {
     ],
 };
 
+const helpContent = {
+    title: 'Thông tin & Hướng dẫn',
+    sections: [...infoContent.sections, ...docsContent.sections],
+};
+
 const POPUP_CONTENT = {
-    info: infoContent,
-    docs: docsContent,
+    help: helpContent,
 };
 
 document.addEventListener('DOMContentLoaded', () => {
@@ -70,6 +76,8 @@ document.addEventListener('DOMContentLoaded', () => {
     const imageInputGrid = document.getElementById('image-input-grid');
     const imageDisplayArea = document.querySelector('.image-display-area');
     const canvasToolbar = document.querySelector('.canvas-toolbar');
+    const sidebar = document.querySelector('.sidebar');
+    const resizeHandle = document.querySelector('.sidebar-resize-handle');
 
     let zoomLevel = 1;
     let panOffset = { x: 0, y: 0 };
@@ -224,6 +232,7 @@ document.addEventListener('DOMContentLoaded', () => {
     });
 
     loadGallery();
+    setupSidebarResizer(sidebar, resizeHandle);
 
     function setViewState(state) {
         placeholderState.classList.add('hidden');
@@ -472,4 +481,48 @@ document.addEventListener('DOMContentLoaded', () => {
         panOffset = { x: 0, y: 0 };
         setImageTransform();
     }
+
+    function setupSidebarResizer(sidebar, handle) {
+        if (!sidebar || !handle) return;
+        let isResizing = false;
+        let activePointerId = null;
+
+        const updateWidth = (clientX) => {
+            const sidebarRect = sidebar.getBoundingClientRect();
+            let newWidth = clientX - sidebarRect.left;
+            newWidth = clamp(newWidth, SIDEBAR_MIN_WIDTH, SIDEBAR_MAX_WIDTH);
+            sidebar.style.width = `${newWidth}px`;
+        };
+
+        const stopResize = () => {
+            if (!isResizing) return;
+            isResizing = false;
+            if (activePointerId !== null) {
+                try {
+                    handle.releasePointerCapture(activePointerId);
+                } catch (error) {
+                    console.warn('Unable to release pointer capture', error);
+                }
+                activePointerId = null;
+            }
+            document.body.style.cursor = '';
+        };
+
+        handle.addEventListener('pointerdown', (event) => {
+            isResizing = true;
+            activePointerId = event.pointerId;
+            handle.setPointerCapture(activePointerId);
+            document.body.style.cursor = 'ew-resize';
+            event.preventDefault();
+        });
+
+        document.addEventListener('pointermove', (event) => {
+            if (!isResizing) return;
+            updateWidth(event.clientX);
+        });
+
+        document.addEventListener('pointerup', stopResize);
+        document.addEventListener('pointercancel', stopResize);
+    }
+
 });
diff --git a/static/style.css b/static/style.css
index a04efc9..799db05 100644
--- a/static/style.css
+++ b/static/style.css
@@ -47,7 +47,7 @@ a:hover {
     display: flex;
     height: 100vh;
     width: 100%;
-    gap: 1rem;
+    gap: 0;
     padding: 1rem;
     position: relative;
     z-index: 1;
@@ -69,21 +69,25 @@ a:hover {
     border-radius: 1rem;
 }
 
-.top-toolbar {
-    background: transparent;
-    border: 1px solid rgba(255, 255, 255, 0.08);
+.sidebar-resize-handle {
+    width: 4px;
+    flex-shrink: 0;
+    cursor: ew-resize;
+    position: relative;
     display: flex;
-    flex-direction: row;
-    justify-content: flex-end;
-    align-items: center;
-    gap: 0.75rem;
-    padding: 1rem;
-    border-radius: 1rem;
-    width: 100%;
+    align-self: stretch;
+}
+
+.sidebar-resize-handle::before {
+    content: '';
+    position: absolute;
+    inset: 0;
+    background: transparent;
 }
 
 .content-area {
     flex: 1;
+    margin-left: 0.5rem;
     display: flex;
     flex-direction: column;
     gap: 1rem;
@@ -93,21 +97,19 @@ a:hover {
     min-height: 0;
 }
 
-.toolbar-info {
-    display: flex;
-    gap: 0.5rem;
-}
-
 .toolbar-info-btn {
     border: 1px solid rgba(255, 255, 255, 0.2);
     background: rgba(255, 255, 255, 0.04);
     color: var(--text-secondary);
-    padding: 0.2rem 0.6rem;
-    border-radius: 999px;
-    font-size: 0.7rem;
+    padding: 0.35rem 0.6rem;
+    border-radius: 0;
+    font-size: 0.8rem;
     cursor: pointer;
     transition: border-color 0.2s, color 0.2s, background 0.2s, box-shadow 0.2s;
-    line-height: 1.2;
+    line-height: 1;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
 }
 
 .toolbar-info-btn:hover:not(:disabled) {
@@ -122,9 +124,29 @@ a:hover {
     cursor: not-allowed;
 }
 
+.sidebar-header {
+    display: flex;
+    align-items: flex-start;
+    justify-content: space-between;
+    gap: 1rem;
+    margin-bottom: 1rem;
+    width: 100%;
+}
+
+.info-icon-btn {
+    width: 36px;
+    height: 36px;
+    padding: 0;
+    min-width: 36px;
+    border-radius: 0;
+    font-size: 1rem;
+    font-weight: 600;
+    line-height: 1;
+}
+
 
 .brand {
-    margin-bottom: 2rem;
+    margin-bottom: 0;
 }
 
 .brand h1 {
diff --git a/templates/index.html b/templates/index.html
index b7a15ce..81f19f8 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -15,73 +15,74 @@
 </head>
 
 <body>
-    <div class="app-container">
-        <aside class="sidebar">
-            <div class="brand">
-                <h1>aPix <span class="badge">by SDVN</span></h1>
-            </div>
-
-            <div class="controls-section">
-                <div class="controls-content">
-                    <div class="input-group">
-                        <label for="api-key">API Key</label>
-                        <input type="password" id="api-key" placeholder="Google Cloud API Key">
+        <div class="app-container">
+            <aside class="sidebar">
+                <div class="sidebar-header">
+                    <div class="brand">
+                        <h1>aPix <span class="badge">by SDVN</span></h1>
                     </div>
-
-                    <div class="input-group">
-                        <label for="prompt">Prompt</label>
-                        <textarea id="prompt" placeholder="Describe your imagination..." rows="6"></textarea>
-                    </div>
-
-                    <div class="input-group image-inputs">
-                        <div class="image-input-header">
-                            <label>Reference Images (optional)</label>
-                            <span>Drag & drop up to 16 files</span>
-                        </div>
-                        <div id="image-input-grid" class="image-input-grid" aria-live="polite"></div>
-                    </div>
-
-                    <div class="input-group">
-                        <label for="aspect-ratio">Aspect Ratio</label>
-                        <select id="aspect-ratio">
-                            <option value="Auto">Auto (Default)</option>
-                            <option value="1:1">1:1 (Square)</option>
-                            <option value="16:9">16:9 (Widescreen)</option>
-                            <option value="4:3">4:3 (Standard)</option>
-                            <option value="3:4">3:4 (Portrait)</option>
-                            <option value="9:16">9:16 (Mobile)</option>
-                            <option value="2:3">2:3</option>
-                            <option value="3:2">3:2</option>
-                            <option value="4:5">4:5</option>
-                            <option value="5:4">5:4</option>
-                            <option value="21:9">21:9 (Cinema)</option>
-                        </select>
-                    </div>
-
-                    <div class="input-group">
-                        <label for="resolution">Resolution</label>
-                        <select id="resolution">
-                            <option value="1K" selected>1K</option>
-                            <option value="2K">2K</option>
-                            <option value="4K">4K</option>
-                        </select>
-                    </div>
-                </div>
-                <div class="controls-footer">
-                    <button id="generate-btn">
-                        <span>Generate</span>
-                        <div class="btn-shine"></div>
+                    <button type="button" class="toolbar-info-btn info-icon-btn" data-popup-target="help"
+                        aria-label="Thông tin và hướng dẫn">
+                        <span aria-hidden="true">i</span>
                     </button>
                 </div>
-            </div>
-        </aside>
-        <div class="content-area">
-            <div class="top-toolbar">
-                <div class="toolbar-info">
-                    <button type="button" class="toolbar-info-btn" data-popup-target="docs">Docs</button>
-                    <button type="button" class="toolbar-info-btn" data-popup-target="info">Info</button>
+
+                <div class="controls-section">
+                    <div class="controls-content">
+                        <div class="input-group">
+                            <label for="api-key">API Key</label>
+                            <input type="password" id="api-key" placeholder="Google Cloud API Key">
+                        </div>
+
+                        <div class="input-group">
+                            <label for="prompt">Prompt</label>
+                            <textarea id="prompt" placeholder="Describe your imagination..." rows="6"></textarea>
+                        </div>
+
+                        <div class="input-group image-inputs">
+                            <div class="image-input-header">
+                                <label>Reference Images (optional)</label>
+                                <span>Drag & drop up to 16 files</span>
+                            </div>
+                            <div id="image-input-grid" class="image-input-grid" aria-live="polite"></div>
+                        </div>
+
+                        <div class="input-group">
+                            <label for="aspect-ratio">Aspect Ratio</label>
+                            <select id="aspect-ratio">
+                                <option value="Auto">Auto (Default)</option>
+                                <option value="1:1">1:1 (Square)</option>
+                                <option value="16:9">16:9 (Widescreen)</option>
+                                <option value="4:3">4:3 (Standard)</option>
+                                <option value="3:4">3:4 (Portrait)</option>
+                                <option value="9:16">9:16 (Mobile)</option>
+                                <option value="2:3">2:3</option>
+                                <option value="3:2">3:2</option>
+                                <option value="4:5">4:5</option>
+                                <option value="5:4">5:4</option>
+                                <option value="21:9">21:9 (Cinema)</option>
+                            </select>
+                        </div>
+
+                        <div class="input-group">
+                            <label for="resolution">Resolution</label>
+                            <select id="resolution">
+                                <option value="1K" selected>1K</option>
+                                <option value="2K">2K</option>
+                                <option value="4K">4K</option>
+                            </select>
+                        </div>
+                    </div>
+                    <div class="controls-footer">
+                        <button id="generate-btn">
+                            <span>Generate</span>
+                            <div class="btn-shine"></div>
+                        </button>
+                    </div>
                 </div>
-            </div>
+            </aside>
+            <div class="sidebar-resize-handle" aria-hidden="true"></div>
+                <div class="content-area">
             <main class="main-content">
                 <div class="image-display-area">
                     <div id="placeholder-state" class="state-view">
@@ -141,4 +142,4 @@
     <script type="module" src="{{ url_for('static', filename='script.js') }}"></script>
 </body>
 
-</html>
\ No newline at end of file
+</html>