diff --git a/memento-note/components/contextual-ai-chat.tsx b/memento-note/components/contextual-ai-chat.tsx
index 1d5578c..ac3d1e1 100644
--- a/memento-note/components/contextual-ai-chat.tsx
+++ b/memento-note/components/contextual-ai-chat.tsx
@@ -97,6 +97,8 @@ interface ContextualAIChatProps {
   className?: string
   /** How to embed generated diagram images (markdown vs rich text HTML) */
   diagramInsertFormat?: 'markdown' | 'html'
+  /** Called to trigger AI title generation for the note */
+  onGenerateTitle?: () => void
 }
 
 // ── Component ─────────────────────────────────────────────────────────────────
@@ -113,6 +115,7 @@ export function ContextualAIChat({
   notebooks = [],
   className,
   diagramInsertFormat = 'markdown',
+  onGenerateTitle,
 }: ContextualAIChatProps) {
   const { t, language } = useLanguage()
   const webSearchAvailable = useWebSearchAvailable()
@@ -513,8 +516,7 @@ export function ContextualAIChat({
 
   return (
     <aside className={cn(
-      'border-l border-border/40 bg-card flex flex-col self-stretch flex-shrink-0 z-10 transition-all duration-300',
-      expanded ? 'w-[560px]' : 'w-[360px]',
+      'border-l border-border/40 bg-background flex flex-col h-full w-full flex-shrink-0 z-10 transition-all duration-300',
       className,
     )}>
 
@@ -541,16 +543,16 @@ export function ContextualAIChat({
                 <RotateCcw className="h-3.5 w-3.5" />
               </Button>
             )}
-            <Button
-              variant="ghost" size="icon"
-              className="h-7 w-7 text-muted-foreground hover:text-foreground"
-              onClick={() => setExpanded(e => !e)}
-              title={expanded ? t('ai.shrinkPanel') : t('ai.expandPanel')}
-            >
-              {expanded
-                ? <Minimize2 className="h-3.5 w-3.5" />
-                : <Maximize2 className="h-3.5 w-3.5" />}
-            </Button>
+            {onGenerateTitle && (
+              <Button
+                variant="ghost" size="icon"
+                className="h-7 w-7 text-muted-foreground hover:text-amber-500 hover:bg-amber-50 dark:hover:bg-amber-950/30"
+                onClick={onGenerateTitle}
+                title="Générer un titre automatique"
+              >
+                <Wand2 className="h-3.5 w-3.5" />
+              </Button>
+            )}
             <Button variant="ghost" size="icon" onClick={onClose} className="h-7 w-7 text-muted-foreground hover:text-foreground">
               <X className="h-3.5 w-3.5" />
             </Button>
diff --git a/memento-note/components/note-editor.tsx b/memento-note/components/note-editor.tsx
index 56c59d0..da5b752 100644
--- a/memento-note/components/note-editor.tsx
+++ b/memento-note/components/note-editor.tsx
@@ -793,13 +793,13 @@ export function NoteEditor({ note, readOnly = false, onClose, fullPage = false }
                     onChange={(e) => { setTitle(e.target.value); setIsDirty(true); setDismissedTitleSuggestions(true) }}
                     disabled={readOnly}
                     className={cn(
-                      'w-full text-5xl md:text-6xl font-memento-serif font-bold border-0 outline-none px-0 bg-transparent text-foreground leading-tight',
+                      'w-full text-4xl md:text-5xl font-memento-serif font-bold border-0 outline-none px-0 bg-transparent text-foreground leading-tight',
                       'placeholder:text-foreground/20',
-                      !readOnly && 'pr-14'
+                      !readOnly && 'pr-12'
                     )}
                   />
-                  {/* AI title generation — shown when title is empty */}
-                  {!title && !readOnly && (
+                  {/* AI title generation — always visible on hover */}
+                  {!readOnly && (
                     <button
                       type="button"
                       onClick={async () => {
@@ -821,7 +821,7 @@ export function NoteEditor({ note, readOnly = false, onClose, fullPage = false }
                       }}
                       disabled={isProcessingAI}
                       className="absolute right-0 top-1/2 -translate-y-1/2 opacity-0 group-hover:opacity-60 hover:!opacity-100 transition-opacity rounded-lg p-2 text-foreground/50 hover:bg-black/5"
-                      title="Generate AI title"
+                      title="Générer un titre automatique avec l'IA"
                     >
                       {isProcessingAI ? <Loader2 className="h-5 w-5 animate-spin" /> : <Sparkles className="h-5 w-5" />}
                     </button>
@@ -849,8 +849,8 @@ export function NoteEditor({ note, readOnly = false, onClose, fullPage = false }
                 </div>
               )}
 
-              {/* Content area — max-w-2xl, like prototype */}
-              <div className="max-w-2xl mx-auto pb-32">
+              {/* Content area — max-w-3xl for wider reading column */}
+              <div className="max-w-3xl mx-auto w-full pb-32">
                 {noteType === 'richtext' ? (
                   <div className="fullpage-editor">
                     <RichTextEditor
@@ -882,7 +882,7 @@ export function NoteEditor({ note, readOnly = false, onClose, fullPage = false }
                       onFocus={() => setShowMarkdownPreview(false)}
                       onChange={(e) => { setContent(e.target.value); setIsDirty(true) }}
                       disabled={readOnly}
-                      className="w-full min-h-[280px] border-0 outline-none px-0 bg-transparent text-lg leading-relaxed font-light resize-none overflow-hidden placeholder:text-foreground/20 text-foreground/80"
+                      className="w-full min-h-[280px] border-0 outline-none px-0 bg-transparent text-xl leading-relaxed resize-none overflow-hidden placeholder:text-foreground/30 text-foreground"
                     />
                     {!readOnly && (
                       <MarkdownSlashCommands
@@ -916,10 +916,28 @@ export function NoteEditor({ note, readOnly = false, onClose, fullPage = false }
                 lastActionApplied={previousContentForCopilot !== null}
                 notebooks={notebooks.map(nb => ({ id: nb.id, name: nb.name }))}
                 diagramInsertFormat={noteType === 'richtext' ? 'html' : 'markdown'}
+                onGenerateTitle={async () => {
+                  const plain = content.replace(/<[^>]+>/g, ' ').trim()
+                  if (plain.split(/\s+/).filter(Boolean).length < 3) return
+                  setIsProcessingAI(true)
+                  try {
+                    const res = await fetch('/api/ai/title-suggestions', {
+                      method: 'POST',
+                      headers: { 'Content-Type': 'application/json' },
+                      body: JSON.stringify({ content: plain }),
+                    })
+                    if (res.ok) {
+                      const data = await res.json()
+                      const s = data.title || data.suggestedTitle || (data.suggestions?.[0]?.title ?? '')
+                      if (s) { setTitle(s); setIsDirty(true) }
+                    }
+                  } catch {} finally { setIsProcessingAI(false) }
+                }}
               />
             </div>
           )}
 
+
           {/* ── Side panel: Document Info ── */}
           {infoOpen && (
             <div className="w-[400px] h-full self-stretch border-l border-black/10 dark:border-white/10 bg-background flex flex-col z-50 shrink-0">