diff --git a/src/components/Experience.astro b/src/components/Experience.astro
index e5d0281..2f6ec60 100644
--- a/src/components/Experience.astro
+++ b/src/components/Experience.astro
@@ -9,11 +9,11 @@
 
     <div class="flex flex-col items-start w-full">
       <!-- 3 cards row -->
-      <div class="flex flex-col lg:flex-row lg:gap-[24px] lg:h-[477px] lg:items-center gap-6 w-full shrink-0">
+      <div class="grid grid-cols-1 md:grid-cols-3 gap-6 w-full">
 
         <!-- Card 1: Clear Interface -->
-        <div class="bg-gradient-to-b from-[#fef0eb] to-white flex flex-col gap-[36px] lg:h-full items-center overflow-clip pb-[36px] px-[36px] rounded-tl-[30px] rounded-tr-[30px] shrink-0 w-full lg:w-[320px]">
-          <div class="relative h-[232px] shrink-0 w-full lg:w-[320px]">
+        <div class="bg-gradient-to-b from-[#fef0eb] to-white flex flex-col gap-[36px] items-center overflow-clip pb-[36px] px-[36px] rounded-tl-[30px] rounded-tr-[30px] w-full">
+          <div class="relative h-[232px] shrink-0 w-full">
             <div class="absolute inset-0 overflow-hidden pointer-events-none">
               <img alt="Clear interface screenshot" class="absolute h-[298.5%] left-0 max-w-none top-[-58.58%] w-full" src="/assets/exp-card-1.png" />
             </div>
@@ -25,8 +25,8 @@
         </div>
 
         <!-- Card 2: Smooth Navigation -->
-        <div class="bg-gradient-to-b from-[#fef0eb] to-white flex flex-col gap-[36px] lg:h-full items-center overflow-clip pb-[36px] px-[36px] rounded-tl-[30px] rounded-tr-[30px] shrink-0 w-full lg:w-[320px]">
-          <div class="bg-[#ffeddf] flex flex-col items-start shrink-0 w-full lg:w-[320px]">
+        <div class="bg-gradient-to-b from-[#fef0eb] to-white flex flex-col gap-[36px] items-center overflow-clip pb-[36px] px-[36px] rounded-tl-[30px] rounded-tr-[30px] w-full">
+          <div class="bg-[#ffeddf] flex flex-col items-start w-full">
             <div class="relative h-[232px] shrink-0 w-full">
               <div class="absolute inset-0 overflow-hidden pointer-events-none">
                 <img alt="Smooth navigation screenshot" class="absolute h-[411.28%] left-[-5.95%] max-w-none top-[-335.6%] w-[137.79%]" src="/assets/exp-card-2.png" />
@@ -40,8 +40,8 @@
         </div>
 
         <!-- Card 3: Refined Visual Design -->
-        <div class="bg-gradient-to-b from-[#fef0eb] to-white flex flex-col gap-[36px] lg:h-full items-center overflow-clip pb-[36px] px-[36px] rounded-tl-[30px] rounded-tr-[30px] shrink-0 w-full lg:w-[320px]">
-          <div class="bg-[#ffeddf] flex flex-col h-[232px] items-start overflow-clip shrink-0 w-full lg:w-[320px]">
+        <div class="bg-gradient-to-b from-[#fef0eb] to-white flex flex-col gap-[36px] items-center overflow-clip pb-[36px] px-[36px] rounded-tl-[30px] rounded-tr-[30px] w-full">
+          <div class="bg-[#ffeddf] flex flex-col h-[232px] items-start overflow-clip w-full">
             <div class="flex-1 min-h-0 relative w-full">
               <div class="absolute inset-0 overflow-hidden pointer-events-none">
                 <img alt="Refined visual design screenshot" class="absolute h-[298.5%] left-0 max-w-none top-[-99.23%] w-full" src="/assets/exp-card-3.png" />
diff --git a/src/components/Header.astro b/src/components/Header.astro
index 4341e12..f5b85a6 100644
--- a/src/components/Header.astro
+++ b/src/components/Header.astro
@@ -4,8 +4,9 @@ const logoWordmark = "/assets/header-logo-wordmark.svg";
 const globeIcon = "/assets/header-globe.svg";
 ---
 
-<header class="bg-white border-b border-[#e3d9d1] w-full flex items-center justify-center h-[72px] sticky top-0 z-50">
-  <div class="flex items-center w-full max-w-[1280px] mx-auto px-4 lg:px-6">
+<header id="site-header" class="bg-white border-b border-[#e3d9d1] w-full sticky top-0 z-50">
+  <!-- Main bar -->
+  <div class="flex items-center w-full max-w-[1280px] mx-auto px-4 lg:px-6 h-[72px] gap-6">
     <!-- Logo -->
     <div class="flex flex-1 items-center min-w-0">
       <a href="/" class="relative h-[42px] w-[143px] shrink-0 block">
@@ -18,24 +19,98 @@ const globeIcon = "/assets/header-globe.svg";
       </a>
     </div>
 
-    <!-- Nav -->
-    <nav class="hidden lg:flex items-center gap-[32px] shrink-0">
-      <a href="#" class="font-semibold text-[14px] text-[#f28a4b] tracking-[-0.09px] whitespace-nowrap leading-normal">Home</a>
-      <a href="#features" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors">Features</a>
-      <a href="#experience" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors">Experience</a>
-      <a href="#use-cases" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors">Use Cases</a>
-      <a href="#reliability" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors">Reliability</a>
+    <!-- Desktop nav -->
+    <nav class="hidden lg:flex items-center gap-[32px] shrink-0" aria-label="Main navigation">
+      <a href="#hero" class="font-semibold text-[14px] text-[#f28a4b] tracking-[-0.09px] whitespace-nowrap leading-normal" data-nav-link>Home</a>
+      <a href="#features" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors" data-nav-link>Features</a>
+      <a href="#experience" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors" data-nav-link>Experience</a>
+      <a href="#use-cases" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors" data-nav-link>Use Cases</a>
+      <a href="#reliability" class="font-semibold text-[14px] text-[#7a726d] tracking-[-0.09px] whitespace-nowrap leading-normal hover:text-[#f28a4b] transition-colors" data-nav-link>Reliability</a>
     </nav>
 
     <!-- Actions -->
     <div class="flex flex-1 gap-[12px] items-center justify-end min-w-0">
+      <!-- Language button (desktop only) -->
       <button class="hidden lg:flex border border-[rgba(46,42,40,0.3)] gap-[8px] h-[43px] items-center justify-center pl-[12px] pr-[16px] rounded-[17px] shrink-0 hover:border-[#f28a4b] transition-colors">
         <img alt="Language" class="block size-[26px] object-contain" src={globeIcon} />
         <span class="font-semibold text-[14px] text-[#2e2a28] tracking-[-0.09px] whitespace-nowrap leading-[14px]">EN</span>
       </button>
-      <a href="#download" class="bg-[#f28a4b] flex items-center justify-center px-[22px] py-[13px] rounded-[17px] shrink-0 hover:bg-[#e07a3b] transition-colors">
+      <!-- Download button (desktop only) -->
+      <a href="#download" class="hidden lg:flex bg-[#f28a4b] items-center justify-center px-[22px] py-[13px] rounded-[17px] shrink-0 hover:bg-[#e07a3b] transition-colors">
         <span class="font-bold text-[14px] text-white leading-normal whitespace-nowrap">Download</span>
       </a>
+
+      <!-- Hamburger toggle (mobile only) -->
+      <button
+        id="menu-toggle"
+        class="lg:hidden flex flex-col justify-center gap-[5px] w-[40px] h-[40px] p-[8px] shrink-0"
+        type="button"
+        aria-label="Open menu"
+        aria-expanded="false"
+        aria-controls="mobile-nav"
+      >
+        <span id="bar-1" class="block w-full h-[2px] bg-[#2e2a28] rounded-sm transition-all duration-[240ms] origin-center"></span>
+        <span id="bar-2" class="block w-full h-[2px] bg-[#2e2a28] rounded-sm transition-all duration-[240ms]"></span>
+        <span id="bar-3" class="block w-full h-[2px] bg-[#2e2a28] rounded-sm transition-all duration-[240ms] origin-center"></span>
+      </button>
     </div>
   </div>
+
+  <!-- Mobile nav drawer -->
+  <div id="mobile-nav" class="hidden lg:!hidden border-t border-[#e3d9d1] bg-white" aria-hidden="true">
+    <ul class="flex flex-col px-6 py-4 list-none m-0 p-0 px-6 py-4">
+      <li><a href="#hero" class="block py-4 font-semibold text-[16px] text-[#2e2a28] border-b border-[#e3d9d1]" data-nav-link>Home</a></li>
+      <li><a href="#features" class="block py-4 font-semibold text-[16px] text-[#2e2a28] border-b border-[#e3d9d1]" data-nav-link>Features</a></li>
+      <li><a href="#experience" class="block py-4 font-semibold text-[16px] text-[#2e2a28] border-b border-[#e3d9d1]" data-nav-link>Experience</a></li>
+      <li><a href="#use-cases" class="block py-4 font-semibold text-[16px] text-[#2e2a28] border-b border-[#e3d9d1]" data-nav-link>Use Cases</a></li>
+      <li><a href="#reliability" class="block py-4 font-semibold text-[16px] text-[#2e2a28]" data-nav-link>Reliability</a></li>
+      <li class="mt-4 mb-2">
+        <a href="#download" class="block text-center bg-[#f28a4b] text-white font-bold text-[15px] py-[14px] px-6 rounded-[17px] hover:bg-[#e07a3b] transition-colors">
+          Download
+        </a>
+      </li>
+    </ul>
+  </div>
 </header>
+
+<script>
+  const toggle = document.getElementById('menu-toggle') as HTMLButtonElement;
+  const nav    = document.getElementById('mobile-nav') as HTMLDivElement;
+  const bar1   = document.getElementById('bar-1') as HTMLSpanElement;
+  const bar2   = document.getElementById('bar-2') as HTMLSpanElement;
+  const bar3   = document.getElementById('bar-3') as HTMLSpanElement;
+
+  function openMenu() {
+    toggle.setAttribute('aria-expanded', 'true');
+    toggle.setAttribute('aria-label', 'Close menu');
+    nav.classList.remove('hidden');
+    nav.removeAttribute('aria-hidden');
+    // Animate to X
+    bar1.style.transform = 'translateY(7px) rotate(45deg)';
+    bar2.style.opacity = '0';
+    bar3.style.transform = 'translateY(-7px) rotate(-45deg)';
+  }
+
+  function closeMenu() {
+    toggle.setAttribute('aria-expanded', 'false');
+    toggle.setAttribute('aria-label', 'Open menu');
+    nav.classList.add('hidden');
+    nav.setAttribute('aria-hidden', 'true');
+    // Reset bars
+    bar1.style.transform = '';
+    bar2.style.opacity = '';
+    bar3.style.transform = '';
+  }
+
+  toggle.addEventListener('click', () => {
+    toggle.getAttribute('aria-expanded') === 'true' ? closeMenu() : openMenu();
+  });
+
+  // Close when any nav link is clicked
+  nav.querySelectorAll('a').forEach(a => a.addEventListener('click', closeMenu));
+
+  // Close when resized past mobile breakpoint
+  window.addEventListener('resize', () => {
+    if (window.innerWidth >= 1024) closeMenu();
+  });
+</script>
diff --git a/src/components/Hero.astro b/src/components/Hero.astro
index 5e532ec..54ae3d9 100644
--- a/src/components/Hero.astro
+++ b/src/components/Hero.astro
@@ -3,7 +3,7 @@ const heroBg = "/assets/hero-bg.png";
 const phoneMockup = "/assets/hero-phone.png";
 ---
 
-<section class="relative w-full flex items-start justify-center min-h-[600px] lg:h-[891px] overflow-hidden">
+<section id="hero" class="relative w-full flex items-start justify-center min-h-[600px] lg:h-[891px] overflow-hidden">
   <img alt="" class="absolute inset-0 max-w-none object-cover size-full pointer-events-none" src={heroBg} />
 
   <div class="relative flex flex-col-reverse lg:flex-row gap-[40px] items-start w-full max-w-[1280px] mx-auto px-4 lg:px-0 h-full">
diff --git a/src/layouts/Base.astro b/src/layouts/Base.astro
index 356a209..4b30717 100644
--- a/src/layouts/Base.astro
+++ b/src/layouts/Base.astro
@@ -16,9 +16,49 @@ const { title = 'Talk Pro — One User. Multiple Worlds.' } = Astro.props
     <title>{title}</title>
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
-    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;700&display=swap" rel="stylesheet" />
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet" />
   </head>
   <body class="bg-surface font-sans overflow-x-hidden">
     <slot />
+    <script>
+      (() => {
+        const header = document.getElementById('site-header');
+        const getOffset = () => header ? header.offsetHeight : 0;
+
+        // Smooth scroll with header offset
+        document.querySelectorAll('a[href^="#"]').forEach(link => {
+          link.addEventListener('click', e => {
+            const href = link.getAttribute('href');
+            if (!href || href === '#') return;
+            const target = document.querySelector(href);
+            if (!target) return;
+            e.preventDefault();
+            const top = target.getBoundingClientRect().top + window.scrollY - getOffset();
+            window.scrollTo({ top, behavior: 'smooth' });
+          });
+        });
+
+        // Active nav highlighting via IntersectionObserver
+        const navLinks = document.querySelectorAll('[data-nav-link]');
+        const sections = Array.from(navLinks)
+          .map(l => document.querySelector(l.getAttribute('href') ?? ''))
+          .filter(Boolean) as Element[];
+
+        if ('IntersectionObserver' in window && sections.length) {
+          const observer = new IntersectionObserver(entries => {
+            const visible = entries
+              .filter(e => e.isIntersecting)
+              .sort((a, b) => b.intersectionRatio - a.intersectionRatio)[0];
+            if (!visible) return;
+            navLinks.forEach(link => {
+              const active = link.getAttribute('href') === `#${visible.target.id}`;
+              link.classList.toggle('!text-[#f28a4b]', active);
+              link.classList.toggle('text-[#7a726d]', !active);
+            });
+          }, { rootMargin: '-30% 0px -60% 0px', threshold: 0 });
+          sections.forEach(s => observer.observe(s));
+        }
+      })();
+    </script>
   </body>
 </html>