diff --git a/cshare-app/src/components/Navbar.jsx b/cshare-app/src/components/Navbar.jsx
new file mode 100644
index 0000000..be71edb
--- /dev/null
+++ b/cshare-app/src/components/Navbar.jsx
@@ -0,0 +1,165 @@
+import { useState, useEffect } from 'react';
+import { useNavigate, useLocation } from 'react-router-dom';
+import { MenuIcon, XIcon } from './Icons';
+
+export default function Navbar() {
+  const navigate = useNavigate();
+  const { pathname } = useLocation();
+  const [mobileOpen, setMobileOpen] = useState(false);
+  const [scrolled, setScrolled] = useState(false);
+
+  useEffect(() => {
+    const onScroll = () => setScrolled(window.scrollY > 20);
+    window.addEventListener('scroll', onScroll, { passive: true });
+    return () => window.removeEventListener('scroll', onScroll);
+  }, []);
+
+  const links = [
+    { path: '/', label: 'Home' },
+    { path: '/upload', label: 'Upload' },
+    { path: '/dashboard', label: 'Dashboard' },
+    { path: '/preview', label: 'Preview' },
+  ];
+
+  const extraLinks = [
+    {
+      label: 'Features',
+      action: () => {
+        navigate('/');
+        setTimeout(() => document.getElementById('features')?.scrollIntoView({ behavior: 'smooth' }), 150);
+      },
+    },
+    {
+      label: 'How it Works',
+      action: () => {
+        navigate('/');
+        setTimeout(() => document.getElementById('how-it-works')?.scrollIntoView({ behavior: 'smooth' }), 150);
+      },
+    },
+    { label: 'Pricing', action: () => go('/pricing') },
+    { label: 'Docs', action: () => go('/docs') },
+  ];
+
+  const go = (path) => {
+    navigate(path);
+    setMobileOpen(false);
+    window.scrollTo({ top: 0, behavior: 'smooth' });
+  };
+
+  return (
+    <>
+    <nav
+      className="navbar"
+      style={{
+        boxShadow: scrolled ? '0 1px 20px rgba(0,0,0,0.3)' : 'none',
+        borderBottomColor: scrolled ? 'var(--border)' : 'var(--border-subtle)',
+        transition: 'all var(--transition-base)',
+      }}
+    >
+      <div className="navbar-logo" onClick={() => go('/')}>
+        <div
+          className="logo-mark"
+          style={{ transition: 'all var(--transition-base)' }}
+          onMouseEnter={(e) => {
+            e.currentTarget.style.boxShadow = '0 0 16px rgba(74, 144, 255, 0.4)';
+            e.currentTarget.style.transform = 'scale(1.05)';
+          }}
+          onMouseLeave={(e) => {
+            e.currentTarget.style.boxShadow = 'none';
+            e.currentTarget.style.transform = 'scale(1)';
+          }}
+        >
+          C
+        </div>
+        CShare
+      </div>
+
+      {/* Desktop nav */}
+      <div className="navbar-links">
+        {links.map((link) => (
+          <button
+            type="button"
+            key={link.path}
+            className={`navbar-link ${pathname === link.path ? 'active' : ''}`}
+            onClick={() => go(link.path)}
+            style={{ position: 'relative' }}
+          >
+            {link.label}
+            {pathname === link.path && (
+              <span style={{
+                position: 'absolute',
+                bottom: '-2px',
+                left: '50%',
+                transform: 'translateX(-50%)',
+                width: '16px',
+                height: '2px',
+                borderRadius: '1px',
+                background: 'var(--accent)',
+                boxShadow: '0 0 6px rgba(74, 144, 255, 0.5)',
+              }} />
+            )}
+          </button>
+        ))}
+        {extraLinks.map((link, i) => (
+          <button type="button" key={i} className="navbar-link" onClick={link.action}>
+            {link.label}
+          </button>
+        ))}
+        <button
+          type="button"
+          className="btn btn-primary btn-sm"
+          style={{ marginLeft: '12px' }}
+          onClick={() => go('/upload')}
+        >
+          Share Files
+        </button>
+      </div>
+
+      {/* Mobile hamburger */}
+      <button
+        type="button"
+        className="btn btn-ghost btn-icon mobile-menu-btn"
+        aria-label={mobileOpen ? 'Close navigation menu' : 'Open navigation menu'}
+        aria-controls="mobile-navigation"
+        aria-expanded={mobileOpen}
+        onClick={() => setMobileOpen((open) => !open)}
+      >
+        {mobileOpen ? <XIcon size={20} /> : <MenuIcon size={20} />}
+      </button>
+    </nav>
+    {mobileOpen && (
+      <div id="mobile-navigation" className="mobile-menu-panel">
+        <div className="mobile-menu-list">
+          {links.map((link) => (
+            <button
+              type="button"
+              key={link.path}
+              className={`mobile-menu-link ${pathname === link.path ? 'active' : ''}`}
+              onClick={() => go(link.path)}
+            >
+              {link.label}
+            </button>
+          ))}
+          {extraLinks.map((link, i) => (
+            <button
+              type="button"
+              key={i}
+              className="mobile-menu-link"
+              onClick={() => { link.action(); setMobileOpen(false); }}
+            >
+              {link.label}
+            </button>
+          ))}
+          <button
+            type="button"
+            className="btn btn-primary btn-lg mobile-menu-cta"
+            onClick={() => go('/upload')}
+          >
+            Share Files
+          </button>
+        </div>
+      </div>
+    )}
+    </>
+  );
+}