Implement auto-hiding sticky navbar on scroll and pointer-event safe smooth scroll

src/App.jsx

@@ -380,6 +380,30 @@ export default function App({ previewMode = false }) {
   const [isCareersOpen, setIsCareersOpen] = useState(false);
   const [activeSection, setActiveSection] = useState('home');
   const [currentPage, setCurrentPage] = useState('home');
+  const [navbarVisible, setNavbarVisible] = useState(true);
+  const lastScrollY = useRef(0);
+
+  const smoothScrollTo = (top) => {
+    document.body.style.pointerEvents = 'none';
+    window.scrollTo({ top, behavior: 'smooth' });
+
+    let scrollTimeout;
+    const handleScrollEnd = () => {
+      document.body.style.pointerEvents = '';
+      window.removeEventListener('scrollend', handleScrollEnd);
+      window.removeEventListener('scroll', handleScrollDebounce);
+      clearTimeout(scrollTimeout);
+    };
+
+    const handleScrollDebounce = () => {
+      clearTimeout(scrollTimeout);
+      scrollTimeout = setTimeout(handleScrollEnd, 100);
+    };
+
+    window.addEventListener('scrollend', handleScrollEnd);
+    window.addEventListener('scroll', handleScrollDebounce);
+    scrollTimeout = setTimeout(handleScrollEnd, 800);
+  };
 
   useEffect(() => {
     const syncPageFromHash = () => {
@@ -387,11 +411,11 @@ export default function App({ previewMode = false }) {
       if (hash === '#contact' || hash === '#contactus') {
         setCurrentPage('contact');
         setActiveSection('contactus');
-        window.scrollTo({ top: 0, behavior: 'smooth' });
+        smoothScrollTo(0);
       } else if (hash === '#about' || hash === '#aboutus') {
         setCurrentPage('about');
         setActiveSection('aboutus');
-        window.scrollTo({ top: 0, behavior: 'smooth' });
+        smoothScrollTo(0);
       } else if (hash === '#home' || hash === '') {
         setCurrentPage('home');
       }
@@ -461,20 +485,36 @@ export default function App({ previewMode = false }) {
   }, []);
 
   useEffect(() => {
-    if (previewMode || currentPage === 'contact') return;
+    if (previewMode) return;
+
+    let lastScroll = window.scrollY;
 
     const handleScroll = () => {
+      const currentScroll = window.scrollY;
+      const diff = currentScroll - lastScroll;
+
+      if (currentScroll <= 50) {
+        setNavbarVisible(true);
+      } else if (diff > 5 && currentScroll > 100) {
+        setNavbarVisible(false);
+      } else if (diff < -5) {
+        setNavbarVisible(true);
+      }
+
+      lastScroll = currentScroll;
+
+      if (currentPage === 'home') {
         // If at top of the page, home is active
-      if (window.scrollY < 100) {
+        if (currentScroll < 100) {
           setActiveSection('home');
           return;
         }
 
         const sections = ['home', 'aboutus', 'services', 'whyus', 'products', 'insights', 'contactus'];
-      const scrollPosition = window.scrollY + 120; // 120px offset for header height and visual center
+        const scrollPosition = currentScroll + 120; // 120px offset for header height and visual center
 
         // Special case: if scrolled down near the very bottom of the page, contactus is active
-      if (window.scrollY > 300 && window.innerHeight + window.scrollY >= document.documentElement.scrollHeight - 100) {
+        if (currentScroll > 300 && window.innerHeight + currentScroll >= document.documentElement.scrollHeight - 100) {
           setActiveSection('contactus');
           return;
         }
@@ -490,12 +530,13 @@ export default function App({ previewMode = false }) {
             }
           }
         }
+      }
     };
 
     window.addEventListener('scroll', handleScroll);
     handleScroll(); // run once on mount
     return () => window.removeEventListener('scroll', handleScroll);
-  }, [previewMode]);
+  }, [previewMode, currentPage]);
 
   const getActiveNavItem = () => {
     if (currentPage === 'contact') return 'Contact Us';
@@ -548,15 +589,16 @@ export default function App({ previewMode = false }) {
     const el = document.getElementById(sectionId);
     if (el) {
       const top = el.getBoundingClientRect().top + window.scrollY - NAV_OFFSET;
-      window.scrollTo({ top, behavior: 'smooth' });
+      smoothScrollTo(top);
       setActiveSection(sectionId);
     } else if (sectionId === 'contactus') {
-      window.scrollTo({ top: document.documentElement.scrollHeight, behavior: 'smooth' });
+      smoothScrollTo(document.documentElement.scrollHeight);
       setActiveSection('contactus');
     }
   };
 
   const handleNavClick = (item) => {
+    setNavbarVisible(true);
     setMobileMenuOpen(false);
     if (item === 'Careers') {
       setIsCareersOpen(true);
@@ -567,7 +609,7 @@ export default function App({ previewMode = false }) {
       setCurrentPage('contact');
       setActiveSection('contactus');
       window.location.hash = 'contact';
-      window.scrollTo({ top: 0, behavior: 'smooth' });
+      smoothScrollTo(0);
       return;
     }
 
@@ -575,7 +617,7 @@ export default function App({ previewMode = false }) {
       setCurrentPage('about');
       setActiveSection('aboutus');
       window.location.hash = 'aboutus';
-      window.scrollTo({ top: 0, behavior: 'smooth' });
+      smoothScrollTo(0);
       return;
     }
 
@@ -587,14 +629,14 @@ export default function App({ previewMode = false }) {
 
     const doScroll = (sectionId) => {
       if (!sectionId || sectionId === 'home') {
-        window.scrollTo({ top: 0, behavior: 'smooth' });
+        smoothScrollTo(0);
         return;
       }
       requestAnimationFrame(() => {
         const el = document.getElementById(sectionId);
         if (el) {
           const top = el.getBoundingClientRect().top + window.scrollY - NAV_OFFSET;
-          window.scrollTo({ top, behavior: 'smooth' });
+          smoothScrollTo(top);
           setActiveSection(sectionId);
         }
       });
@@ -695,9 +737,12 @@ export default function App({ previewMode = false }) {
 
         {/* Navigation Bar */}
         <nav className="glass site-nav" style={{
-          position: 'sticky', top: 0, zIndex: 50,
+          position: 'sticky',
+          top: navbarVisible ? 0 : (isMobile ? '-72px' : '-88px'),
+          zIndex: 50,
           padding: isMobile ? '0.85rem 1.25rem' : '1.2rem 4rem',
-          borderBottom: activeSection === 'products' ? '1px solid rgba(15, 23, 42, 0.08)' : '1px solid rgba(255, 255, 255, 0.05)'
+          borderBottom: activeSection === 'products' ? '1px solid rgba(15, 23, 42, 0.08)' : '1px solid rgba(255, 255, 255, 0.05)',
+          transition: 'top 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-bottom 0.3s ease, padding 0.3s ease'
         }}>
           <div style={{ maxWidth: '1440px', margin: '0 auto', width: '100%', display: 'flex', justifyContent: 'space-between', alignItems: 'center' }}>
             <div