diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..643577d
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,9 @@
+<!-- BEGIN:nextjs-agent-rules -->
+
+# This is NOT the Next.js you know
+
+This version has breaking changes — APIs, conventions, and file structure may all differ from your training data. Read the relevant guide in `node_modules/next/dist/docs/` (resolved from this file's directory; in monorepos the `next` package may not be visible from the repo root) before writing any code. Heed deprecation notices.
+
+This block is written and re-added by `next dev` — verify at `node_modules/next/dist/server/lib/generate-agent-files.js`. Removing it from a diff only re-creates the uncommitted change; committing it with your work keeps the tree clean.
+
+<!-- END:nextjs-agent-rules -->
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..43c994c
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1 @@
+@AGENTS.md
diff --git a/next.config.ts b/next.config.ts
index 00c940e..83223a1 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -5,6 +5,7 @@ const nextConfig: NextConfig = {
   images: {
     unoptimized: true,
   },
+  devIndicators: false,
 };
 
 export default nextConfig;
diff --git a/src/app/globals.css b/src/app/globals.css
index 5f9d308..41ee452 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -1,8 +1,8 @@
 @import "tailwindcss";
 
 :root {
-  --background: #f9fafb;
-  --foreground: #111827;
+  --background: #000000;
+  --foreground: #e5e5e5;
 }
 
 @theme inline {
@@ -12,31 +12,17 @@
   --font-mono: var(--font-geist-mono);
 }
 
-@media (prefers-color-scheme: dark) {
-  :root {
-    --background: #030712;
-    --foreground: #f3f4f6;
-  }
-}
-
 body {
-  background: var(--background);
+  background: #000000;
   color: var(--foreground);
   font-family: var(--font-sans), Arial, Helvetica, sans-serif;
 }
 
-/* AdSense placeholder styling — remove once real ads are connected */
+/* AdSense placeholder styling — sharp theme */
 .ad-container ins.adsbygoogle {
   min-height: 90px;
-  background: repeating-linear-gradient(
-    -45deg,
-    transparent,
-    transparent 10px,
-    rgba(128, 128, 128, 0.03) 10px,
-    rgba(128, 128, 128, 0.03) 20px
-  );
-  border: 1px dashed rgba(128, 128, 128, 0.2);
-  border-radius: 8px;
+  background: #050505;
+  border: 1px solid rgba(255, 255, 255, 0.04);
   display: flex;
   align-items: center;
   justify-content: center;
@@ -44,9 +30,15 @@ body {
 }
 
 .ad-container ins.adsbygoogle::after {
-  content: "Ad Space";
-  font-size: 0.75rem;
-  color: rgba(128, 128, 128, 0.4);
-  font-weight: 500;
-  letter-spacing: 0.05em;
+  content: "Ad";
+  font-size: 0.6rem;
+  color: rgba(255, 255, 255, 0.1);
+  font-weight: 400;
+  letter-spacing: 0.1em;
+  font-family: monospace;
+}
+
+.ad-side ins.adsbygoogle {
+  min-height: 600px;
+  min-width: 160px;
 }
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index 1d0a50e..1623bc1 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -64,7 +64,7 @@ export default function RootLayout({ children }: { children: React.ReactNode })
           crossOrigin="anonymous"
         />
       </head>
-      <body className="flex min-h-full flex-col bg-background text-foreground">
+      <body className="flex min-h-full flex-col bg-black text-foreground">
         <Header />
         <main className="flex-1">{children}</main>
         <Footer />
diff --git a/src/app/page.tsx b/src/app/page.tsx
index e13b9a6..176c263 100644
--- a/src/app/page.tsx
+++ b/src/app/page.tsx
@@ -6,26 +6,40 @@ export default function Home() {
   const toolsByCategory = getToolsByCategory();
 
   return (
-    <div className="mx-auto max-w-4xl px-4 py-8">
-      <h1 className="text-xl font-bold text-gray-900 dark:text-white">Developer Tools</h1>
-      <p className="mb-6 mt-1 text-sm text-gray-400">Free. Private. Browser-based.</p>
+    <div className="flex w-full">
+      {/* Left side ad */}
+      <div className="ad-side hidden xl:flex w-[200px] shrink-0 justify-center pt-6 pl-2">
+        <div className="sticky top-16">
+          <AdSlot slot="home-left" format="vertical" />
+        </div>
+      </div>
 
-      <AdSlot slot="homepage-top" format="horizontal" />
+      {/* Main content */}
+      <div className="flex-1 min-w-0 max-w-4xl mx-auto px-4 py-6">
+        <AdSlot slot="homepage-top" format="horizontal" />
 
-      {Object.entries(toolsByCategory).map(([category, categoryTools]) => (
-        <section key={category} className="mb-6">
-          <h2 className="mb-2 text-xs font-semibold uppercase tracking-wider text-gray-400">
-            {category}
-          </h2>
-          <div className="grid grid-cols-1 gap-2 sm:grid-cols-2 lg:grid-cols-3">
-            {categoryTools.map((tool) => (
-              <ToolCard key={tool.slug} tool={tool} />
-            ))}
-          </div>
-        </section>
-      ))}
+        {Object.entries(toolsByCategory).map(([category, categoryTools]) => (
+          <section key={category} className="mb-6">
+            <h2 className="mb-2 text-xs font-semibold uppercase tracking-wider text-gray-500">
+              {category}
+            </h2>
+            <div className="grid grid-cols-1 gap-px sm:grid-cols-2 lg:grid-cols-3 border border-gray-900">
+              {categoryTools.map((tool) => (
+                <ToolCard key={tool.slug} tool={tool} />
+              ))}
+            </div>
+          </section>
+        ))}
 
-      <AdSlot slot="homepage-bottom" format="horizontal" />
+        <AdSlot slot="homepage-bottom" format="horizontal" />
+      </div>
+
+      {/* Right side ad */}
+      <div className="ad-side hidden xl:flex w-[200px] shrink-0 justify-center pt-6 pr-2">
+        <div className="sticky top-16">
+          <AdSlot slot="home-right" format="vertical" />
+        </div>
+      </div>
     </div>
   );
 }
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index dd85cf1..ae70e4d 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -1,7 +1,7 @@
 export default function Footer() {
   return (
-    <footer className="mt-auto border-t border-gray-200 px-4 py-4 text-center text-xs text-gray-400 dark:border-gray-800">
-      © {new Date().getFullYear()} DevToolbox — Free, private, browser-based developer tools.
+    <footer className="mt-auto border-t border-gray-900 px-4 py-4 text-center text-xs text-gray-600 bg-black">
+      © {new Date().getFullYear()} DevToolbox
     </footer>
   );
 }
diff --git a/src/components/Header.tsx b/src/components/Header.tsx
index ad6eac4..908853e 100644
--- a/src/components/Header.tsx
+++ b/src/components/Header.tsx
@@ -1,17 +1,55 @@
 "use client";
 
+import { useState } from "react";
 import Link from "next/link";
+import { tools } from "@/lib/tools";
 
 export default function Header() {
+  const [query, setQuery] = useState("");
+  const [showResults, setShowResults] = useState(false);
+
+  const filtered = query.trim()
+    ? tools.filter(
+        (t) =>
+          t.name.toLowerCase().includes(query.toLowerCase()) ||
+          t.description.toLowerCase().includes(query.toLowerCase())
+      )
+    : [];
+
   return (
-    <header className="border-b border-gray-200 dark:border-gray-800">
-      <div className="mx-auto flex max-w-5xl items-center justify-between px-4 py-3">
-        <Link href="/" className="text-sm font-semibold text-gray-900 dark:text-white">
-          DevToolbox
-        </Link>
-        <Link href="/" className="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-300">
-          All Tools
-        </Link>
+    <header className="border-b border-gray-900 bg-black">
+      <div className="mx-auto max-w-5xl px-4 py-2.5 relative">
+        <input
+          type="text"
+          placeholder="Search tools..."
+          value={query}
+          onChange={(e) => {
+            setQuery(e.target.value);
+            setShowResults(true);
+          }}
+          onFocus={() => setShowResults(true)}
+          onBlur={() => setTimeout(() => setShowResults(false), 150)}
+          className="w-full border border-gray-800 bg-black px-3 py-2 text-sm text-gray-200 placeholder-gray-600 outline-none focus:border-gray-600 font-mono"
+        />
+
+        {showResults && filtered.length > 0 && (
+          <div className="absolute left-4 right-4 top-full z-50 mt-0 max-h-64 overflow-y-auto border border-gray-800 border-t-0 bg-black shadow-2xl">
+            {filtered.map((tool) => (
+              <Link
+                key={tool.slug}
+                href={`/tools/${tool.slug}`}
+                className="block border-b border-gray-900 px-3 py-2 text-sm text-gray-300 hover:bg-gray-950"
+                onClick={() => {
+                  setQuery("");
+                  setShowResults(false);
+                }}
+              >
+                {tool.icon} {tool.name}
+                <span className="ml-2 text-xs text-gray-600">{tool.description}</span>
+              </Link>
+            ))}
+          </div>
+        )}
       </div>
     </header>
   );
diff --git a/src/components/ToolCard.tsx b/src/components/ToolCard.tsx
index 9117f78..8cb66a2 100644
--- a/src/components/ToolCard.tsx
+++ b/src/components/ToolCard.tsx
@@ -5,12 +5,12 @@ export default function ToolCard({ tool }: { tool: Tool }) {
   return (
     <Link
       href={`/tools/${tool.slug}`}
-      className="block rounded-lg border border-gray-200 px-4 py-3 transition-colors hover:border-gray-400 dark:border-gray-800 dark:hover:border-gray-600"
+      className="block border border-gray-900 px-4 py-3 transition-colors hover:border-gray-600 hover:bg-gray-950 bg-black"
     >
-      <div className="text-sm font-medium text-gray-900 dark:text-white">
+      <div className="text-sm font-medium text-gray-200">
         {tool.icon} {tool.name}
       </div>
-      <div className="mt-0.5 text-xs text-gray-400">{tool.description}</div>
+      <div className="mt-0.5 text-xs text-gray-600">{tool.description}</div>
     </Link>
   );
 }
diff --git a/src/components/ToolLayout.tsx b/src/components/ToolLayout.tsx
index 3846dbf..9c217cc 100644
--- a/src/components/ToolLayout.tsx
+++ b/src/components/ToolLayout.tsx
@@ -8,15 +8,32 @@ interface ToolLayoutProps {
 
 export default function ToolLayout({ title, description, children }: ToolLayoutProps) {
   return (
-    <div className="mx-auto w-full max-w-4xl px-4 py-6">
-      <AdSlot slot="1234567890" format="horizontal" />
+    <div className="flex w-full">
+      {/* Left side ad — flush to edge */}
+      <div className="ad-side hidden xl:flex w-[200px] shrink-0 justify-center pt-6 pl-2">
+        <div className="sticky top-16">
+          <AdSlot slot="left-sidebar" format="vertical" />
+        </div>
+      </div>
 
-      <h1 className="mb-1 text-lg font-semibold text-gray-900 dark:text-white">{title}</h1>
-      <p className="mb-4 text-sm text-gray-400">{description}</p>
+      {/* Main content */}
+      <div className="flex-1 min-w-0 max-w-4xl mx-auto px-4 py-6">
+        <AdSlot slot="1234567890" format="horizontal" />
 
-      {children}
+        <h1 className="mb-1 text-lg font-semibold text-white">{title}</h1>
+        <p className="mb-4 text-sm text-gray-500">{description}</p>
 
-      <AdSlot slot="0987654321" format="horizontal" className="mt-6" />
+        {children}
+
+        <AdSlot slot="0987654321" format="horizontal" className="mt-6" />
+      </div>
+
+      {/* Right side ad — flush to edge */}
+      <div className="ad-side hidden xl:flex w-[200px] shrink-0 justify-center pt-6 pr-2">
+        <div className="sticky top-16">
+          <AdSlot slot="right-sidebar" format="vertical" />
+        </div>
+      </div>
     </div>
   );
 }