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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Responsive Navbar</title>
    <style>
        /* Basic Reset & Body Styling */
        body {
            margin: 0;
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
        }

/* Navbar Styling */
        .navbar {
            background-color: #333;
            color: white;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
            position: sticky; /* Makes the navbar stick to the top */
            top: 0;
            z-index: 1000; /* Ensures it stays on top of other content */
        }

.navbar-brand {
            color: white;
            text-decoration: none;
            font-size: 1.5rem;
            font-weight: bold;
        }

.navbar-nav {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex; /* Desktop: horizontal menu */
        }

.nav-item {
            margin-left: 2rem;
        }

.nav-link {
            color: white;
            text-decoration: none;
            padding: 0.5rem 0;
            transition: color 0.3s ease;
        }

.nav-link:hover {
            color: #ddd;
        }

/* Hamburger Menu Button */
        .menu-toggle {
            display: none; /* Hidden by default on desktop */
            flex-direction: column;
            justify-content: space-between;
            width: 30px;
            height: 20px;
            cursor: pointer;
            position: relative; /* For animation */
            z-index: 1001; /* Ensure it's above the menu when open */
        }

.menu-toggle span {
            display: block;
            width: 100%;
            height: 3px;
            background-color: white;
            border-radius: 2px;
            transition: all 0.3s ease;
        }

/* Responsive Styles */
        @media (max-width: 768px) {
            .navbar {
                flex-wrap: wrap; /* Allow items to wrap */
                padding: 1rem 1rem; /* Adjust padding for smaller screens */
            }

.navbar-nav {
                display: none; /* Hide menu on mobile by default */
                flex-direction: column;
                width: 100%; /* Take full width */
                text-align: center;
                background-color: #444; /* Slightly different background for mobile menu */
                padding: 1rem 0;
                margin-top: 1rem; /* Space from brand */
                border-top: 1px solid #555;
            }

.navbar-nav.active {
                display: flex; /* Show menu when active */
            }

.nav-item {
                margin: 0.5rem 0; /* Adjust spacing for vertical menu */
            }

.menu-toggle {
                display: flex; /* Show hamburger on mobile */
            }

/* Hamburger animation */
            .menu-toggle.active span:nth-child(1) {
                transform: translateY(8px) rotate(-45deg);
            }
            .menu-toggle.active span:nth-child(2) {
                opacity: 0;
            }
            .menu-toggle.active span:nth-child(3) {
                transform: translateY(-8px) rotate(45deg);
            }
        }
    </style>
</head>
<body>
    <nav class="navbar">
        <a href="#" class="navbar-brand">MyBrand</a>
        <div class="menu-toggle" id="mobile-menu">
            <span class="bar"></span>
            <span class="bar"></span>
            <span class="bar"></span>
        </div>
        <ul class="navbar-nav" id="navbar-links">
            <li class="nav-item"><a href="#home" class="nav-link">Home</a></li>
            <li class="nav-item"><a href="#about" class="nav-link">About</a></li>
            <li class="nav-item"><a href="#services" class="nav-link">Services</a></li>
            <li class="nav-item"><a href="#contact" class="nav-link">Contact</a></li>
        </ul>
    </nav>

<main style="padding: 20px; text-align: center; min-height: 100vh;">
        <h1>Welcome to My Website</h1>
        <p>This is a placeholder for your main content.</p>
        <p>Try resizing your browser window to see the responsive navigation bar in action.</p>
        <p>Scroll down to see the sticky effect.</p>
        <div style="height: 800px; background-color: #e0e0e0; margin-top: 20px; display: flex; align-items: center; justify-content: center;">
            <p>More content here...</p>
        </div>
    </main>

mobileMenu.addEventListener('click', () => {
            mobileMenu.classList.toggle('active');
            navLinks.classList.toggle('active');
            // Toggle body overflow to prevent scrolling when menu is open on mobile
            document.body.style.overflow = navLinks.classList.contains('active') ? 'hidden' : 'auto';
        });

// Close menu when a link is clicked (useful for single-page applications)
        document.querySelectorAll('.nav-link').forEach(link => {
            link.addEventListener('click', () => {
                // Only close on mobile if the menu is open
                if (window.innerWidth <= 768 && navLinks.classList.contains('active')) {
                    mobileMenu.classList.remove('active');
                    navLinks.classList.remove('active');
                    document.body.style.overflow = 'auto'; // Restore body scroll
                }
            });
        });

// Close menu if window is resized from mobile to desktop while menu is open
        window.addEventListener('resize', () => {
            if (window.innerWidth > 768 && navLinks.classList.contains('active')) {
                mobileMenu.classList.remove('active');
                navLinks.classList.remove('active');
                document.body.style.overflow = 'auto'; // Restore body scroll
            }
        });
    </script>
</body>
</html>

CSS