feat: refine letters UI

app/books/nod/[chapter]/page.tsx

@@ -43,7 +43,7 @@ export default async function NodChapterPage({
 
   return (
     <div className="min-h-screen bg-background">
-      <PageHeader sticky wide>
+      <PageHeader sticky>
         <Link
           href="/books/nod"
           className="text-sm text-muted-foreground hover:text-foreground transition-colors"
@@ -58,7 +58,7 @@ export default async function NodChapterPage({
         </h1>
       </PageHeader>
 
-      <div className="w-full md:max-w-6xl mx-auto flex">
+      <div className="max-w-5xl mx-auto flex">
         {/* Left sidebar */}
         <NodSidebar items={sidebarItems} currentSlug={slug} />
 

app/books/nod/page.tsx

@@ -37,7 +37,7 @@ export default async function NodPage() {
         <p className="mt-1 text-muted-foreground">{meta.author}</p>
       </PageHeader>
 
-      <main className="max-w-3xl mx-auto px-6 py-8 space-y-8">
+      <main className="max-w-5xl mx-auto px-6 py-8 space-y-8">
         {/* Description */}
         {meta.description && (
           <p className="text-muted-foreground">{meta.description}</p>