diff --git a/README.md b/README.md
index 47f857a..9dbdeba 100644
--- a/README.md
+++ b/README.md
@@ -43,6 +43,7 @@ src/
 - Node.js 22+
 - npm
 - Optional: GitHub personal access token for Projects section
+- Modern browser with `IntersectionObserver` support (Chrome 51+, Firefox 55+, Safari 12.1+, Edge 15+, and modern mobile browsers like iOS Safari 12.2+, Chrome for Android 51+) for animations
 
 ### 1. Clone
 
diff --git a/next.config.ts b/next.config.ts
index b899aa4..03e116d 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -3,7 +3,27 @@ import type { NextConfig } from 'next'
 const nextConfig: NextConfig = {
   experimental: {
     optimizePackageImports: ['@mui/material', '@mui/icons-material'],
+    cssChunking: 'strict',
   },
+  headers: async () => [
+    {
+      source: '/(.*)',
+      headers: [
+        { key: 'X-Content-Type-Options', value: 'nosniff' },
+        { key: 'X-Frame-Options', value: 'DENY' },
+        { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
+      ],
+    },
+    {
+      source: '/_next/static/(.*)',
+      headers: [
+        {
+          key: 'Cache-Control',
+          value: 'public, max-age=31536000, immutable',
+        },
+      ],
+    },
+  ],
 }
 
 export default nextConfig
diff --git a/src/app/globals.css b/src/app/globals.css
index b2555e1..75747a3 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -95,7 +95,7 @@ body {
   animation: header-fade-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) 0.08s both;
 }
 
-/* Section entrance – replaces framer-motion FadeIn */
+/* Section entrance */
 @keyframes fade-in-up {
   from {
     opacity: 0;
@@ -116,7 +116,7 @@ body {
     var(--fade-delay, 0s) both;
 }
 
-/* Stagger children – replaces framer-motion StaggerWrapper/StaggerItem */
+/* Stagger children */
 .stagger-item {
   opacity: 0;
 }
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index e8ad87d..45834a4 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -107,6 +107,18 @@ export default function RootLayout({
   return (
     <html lang="en" suppressHydrationWarning>
       <head>
+        <link rel="dns-prefetch" href="https://api.github.com" />
+        <link
+          rel="preconnect"
+          href="https://api.github.com"
+          crossOrigin="anonymous"
+        />
+        <link rel="dns-prefetch" href="https://medium.com" />
+        <link
+          rel="preconnect"
+          href="https://medium.com"
+          crossOrigin="anonymous"
+        />
         <script
           type="application/ld+json"
           dangerouslySetInnerHTML={{ __html: JSON_LD }}
diff --git a/src/components/layout/footer.tsx b/src/components/layout/footer.tsx
index 2378e45..e91c5f0 100644
--- a/src/components/layout/footer.tsx
+++ b/src/components/layout/footer.tsx
@@ -1,9 +1,14 @@
 'use client'
+import { lazy, Suspense } from 'react'
 import Box from '@mui/material/Box'
 import Stack from '@mui/material/Stack'
 import Typography from '@mui/material/Typography'
 import Link from '@mui/material/Link'
-import { Privacy, usePrivacyModal } from '@/components/sections/privacy'
+import { usePrivacyModal } from '@/components/sections/use-privacy-modal'
+
+const Privacy = lazy(() =>
+  import('@/components/sections/privacy').then((m) => ({ default: m.Privacy })),
+)
 
 export function Footer() {
   const year = new Date().getFullYear()
@@ -103,7 +108,11 @@ export function Footer() {
         </Stack>
       </Box>
 
-      <Privacy open={open} onClose={closeModal} />
+      {open && (
+        <Suspense fallback={null}>
+          <Privacy open={open} onClose={closeModal} />
+        </Suspense>
+      )}
     </>
   )
 }
diff --git a/src/components/sections/privacy.tsx b/src/components/sections/privacy.tsx
index ab91cf9..37ca89c 100644
--- a/src/components/sections/privacy.tsx
+++ b/src/components/sections/privacy.tsx
@@ -1,5 +1,3 @@
-'use client'
-import { useState } from 'react'
 import Dialog from '@mui/material/Dialog'
 import DialogContent from '@mui/material/DialogContent'
 import DialogTitle from '@mui/material/DialogTitle'
@@ -56,6 +54,8 @@ const dialogContentBoxSx = {
   '& ul': {
     pl: { xs: 2.5, sm: 3 },
     '& li': {
+      fontFamily:
+        'var(--font-inter), "Inter", "Helvetica", "Arial", sans-serif',
       fontSize: { xs: '0.875rem', sm: '0.9rem' },
       lineHeight: { xs: 1.5, sm: 1.6 },
       letterSpacing: '0.005em',
@@ -286,12 +286,3 @@ export function Privacy({ open, onClose }: PrivacyProps) {
     </Dialog>
   )
 }
-
-export function usePrivacyModal() {
-  const [open, setOpen] = useState(false)
-
-  const openModal = () => setOpen(true)
-  const closeModal = () => setOpen(false)
-
-  return { open, openModal, closeModal }
-}
diff --git a/src/components/sections/use-privacy-modal.ts b/src/components/sections/use-privacy-modal.ts
new file mode 100644
index 0000000..0ac8bd0
--- /dev/null
+++ b/src/components/sections/use-privacy-modal.ts
@@ -0,0 +1,11 @@
+'use client'
+import { useState, useCallback } from 'react'
+
+export function usePrivacyModal() {
+  const [open, setOpen] = useState(false)
+
+  const openModal = useCallback(() => setOpen(true), [])
+  const closeModal = useCallback(() => setOpen(false), [])
+
+  return { open, openModal, closeModal }
+}
diff --git a/src/components/theme/registry.tsx b/src/components/theme/registry.tsx
index 6a3e46c..bd8f783 100644
--- a/src/components/theme/registry.tsx
+++ b/src/components/theme/registry.tsx
@@ -1,10 +1,9 @@
 'use client'
 import * as React from 'react'
 import { ThemeProvider as MuiThemeProvider } from '@mui/material/styles'
-import CssBaseline from '@mui/material/CssBaseline'
 import { ThemeProvider as NextThemesProvider, useTheme } from 'next-themes'
 import NextAppDirEmotionCacheProvider from './emotion-cache'
-import { getTheme } from './theme'
+import { lightTheme, darkTheme } from './theme'
 
 function MuiThemeWrapper({ children }: { children: React.ReactNode }) {
   const { resolvedTheme } = useTheme()
@@ -14,21 +13,9 @@ function MuiThemeWrapper({ children }: { children: React.ReactNode }) {
     setMounted(true)
   }, [])
 
-  const currentTheme = React.useMemo(() => {
-    const mode = (resolvedTheme ?? 'light') as 'light' | 'dark'
-    return getTheme(mode)
-  }, [resolvedTheme])
+  const theme = mounted && resolvedTheme === 'dark' ? darkTheme : lightTheme
 
-  if (!mounted) {
-    return null
-  }
-
-  return (
-    <MuiThemeProvider theme={currentTheme}>
-      <CssBaseline />
-      {children}
-    </MuiThemeProvider>
-  )
+  return <MuiThemeProvider theme={theme}>{children}</MuiThemeProvider>
 }
 
 export default function ThemeRegistry({
diff --git a/src/components/theme/theme.ts b/src/components/theme/theme.ts
index 8af283b..2cbb2a2 100644
--- a/src/components/theme/theme.ts
+++ b/src/components/theme/theme.ts
@@ -1,7 +1,7 @@
 import { createTheme, PaletteMode } from '@mui/material/styles'
 import { tokens } from './tokens'
 
-export const getTheme = (mode: PaletteMode) => {
+const buildTheme = (mode: PaletteMode) => {
   const isLight = mode === 'light'
 
   return createTheme({
@@ -62,3 +62,6 @@ export const getTheme = (mode: PaletteMode) => {
     },
   })
 }
+
+export const lightTheme = buildTheme('light')
+export const darkTheme = buildTheme('dark')
diff --git a/src/components/ui/use-in-view.ts b/src/components/ui/use-in-view.ts
index aa1dc99..fc21d22 100644
--- a/src/components/ui/use-in-view.ts
+++ b/src/components/ui/use-in-view.ts
@@ -3,7 +3,7 @@ import { useEffect, useRef, useState } from 'react'
 
 /**
  * Lightweight IntersectionObserver hook that fires once when the element
- * enters the viewport. Replaces framer-motion's `whileInView`.
+ * enters the viewport.
  */
 export function useInView(margin = '-40px') {
   const ref = useRef<HTMLDivElement>(null)
@@ -13,11 +13,6 @@ export function useInView(margin = '-40px') {
     const el = ref.current
     if (!el) return
 
-    if (!('IntersectionObserver' in window)) {
-      queueMicrotask(() => setVisible(true))
-      return
-    }
-
     const observer = new IntersectionObserver(
       ([entry]) => {
         if (entry.isIntersecting) {
