Responsive Navigation Bar with Flexbox and JavaScript Toggle

/* HTML structure for context:
<nav class="navbar">
    <a href="#" class="navbar__brand">MyBrand</a>
    <button class="navbar__toggler" aria-label="Toggle navigation">&#9776;</button>
    <div class="navbar__menu">
        <ul class="navbar__list">
            <li class="navbar__item"><a href="#" class="navbar__link">Home</a></li>
            <li class="navbar__item"><a href="#" class="navbar__link">About</a></li>
            <li class="navbar__item"><a href="#" class="navbar__link">Services</a></li>
            <li class="navbar__item"><a href="#" class="navbar__link">Contact</a></li>
        </ul>
    </div>
</nav>

<!-- Example JS for toggler: -->
<!--
<script>
    document.addEventListener('DOMContentLoaded', () => {
        const toggler = document.querySelector('.navbar__toggler');
        const menu = document.querySelector('.navbar__menu');
        toggler.addEventListener('click', () => {
            menu.classList.toggle('is-active');
            toggler.setAttribute('aria-expanded', menu.classList.contains('is-active'));
        });
    });
</script>
-->
*/

body { margin: 0; font-family: sans-serif; }

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #282c34;
    padding: 1rem;
    color: white;
}

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

.navbar__toggler {
    display: none; /* Hidden by default on desktop */
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 0.5rem;
}

.navbar__menu {
    display: flex; /* Flexbox for menu items */
    flex-grow: 1; /* Allow menu to take available space */
    justify-content: flex-end; /* Align items to the right */
}

.navbar__list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.navbar__item {
    margin-left: 1.5rem;
}

.navbar__link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 0;
    display: block;
    transition: color 0.3s ease;
}

.navbar__link:hover { color: #61dafb; }

@media (max-width: 768px) {
    .navbar {
        flex-wrap: wrap; /* Allow items to wrap */
    }
    .navbar__toggler {
        display: block; /* Show toggler on mobile */
    }
    .navbar__menu {
        flex-basis: 100%; /* Menu takes full width */
        flex-direction: column; /* Stack items vertically */
        align-items: flex-start; /* Align items to the left */
        display: none; /* Hide by default on mobile */
        margin-top: 1rem; /* Space below brand/toggler */
    }
    .navbar__menu.is-active {
        display: flex; /* Show when active via JS */
    }
    .navbar__list {
        flex-direction: column;
        width: 100%;
    }
    .navbar__item {
        margin: 0.5rem 0;
        width: 100%;
    }
    .navbar__link {
        padding: 0.8rem 1rem;
        background-color: #3a3f47;
        border-radius: 4px;
    }
}