Bold And Brutalist Navbar

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bold & Brutalist Navbar</title>
    <style>
        /*
        ========================================
        CSS Custom Properties (Brutalist Theme)
        ========================================
        The theme is defined by high contrast, a raw monospace font,
        a single accent color, and a thick border style.
        */
        :root {
            --color-background: #ffffff;
            --color-foreground: #000000;
            --color-accent: #ffff00;   /* A classic, vibrant web yellow */

--font-family-mono: 'SF Mono', 'Menlo', 'Consolas', 'Liberation Mono', monospace;
            --font-weight-bold: 700;
            
            --border-width: 3px;
            --border-style: var(--border-width) solid var(--color-foreground);

--navbar-height: 80px;
            --navbar-padding: 1rem;
            --container-width: 1140px;
            --transition-speed: 0.15s;
        }

/*
        ========================================
        Global Resets & Brutalist Base Styles
        ========================================
        */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            border-radius: 0; /* A core tenet of this style: no rounded corners. */
        }

body {
            margin: 0;
            font-family: var(--font-family-mono);
            font-size: 1rem;
            line-height: 1.5;
            color: var(--color-foreground);
            background-color: var(--color-background);
            /* Set the colors explicitly for a true inversion effect later */
        }

/* Add some placeholder content */
        body::after {
            content: 'Scroll down. This is a standard navbar. Note the hard borders and lack of shadows, which are characteristic of brutalist web design.';
            display: block;
            text-align: center;
            height: 200vh;
            padding-top: 5rem;
            color: #777;
        }
        
        ul { list-style: none; margin: 0; padding: 0; }
        a { text-decoration: none; color: inherit; } /* Links inherit color */

/*
        ========================================
        Main Navbar Structure
        ========================================
        */
        .navbar {
            height: var(--navbar-height);
            display: flex;
            align-items: center;
            border-bottom: var(--border-style);
            background-color: var(--color-background); /* Explicitly set for hover effects */
        }

.navbar__container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 var(--navbar-padding);
        }
        
        .navbar__brand {
            font-size: 1.5rem;
            font-weight: var(--font-weight-bold);
            text-transform: uppercase;
            padding: 0.5rem;
            border: var(--border-style);
            color: var(--color-foreground);
        }

/*
        ========================================
        Mobile Menu & Hamburger Toggle
        ========================================
        */
        .navbar__toggle {
            padding: 0.5rem;
            border: var(--border-style);
            background: transparent;
            cursor: pointer;
            z-index: 1001; 
        }

.navbar__toggle .bar {
            display: block;
            width: 25px;
            height: var(--border-width); /* Match border thickness */
            margin: 5px auto;
            background-color: var(--color-foreground);
            transition: all var(--transition-speed) ease-in-out;
        }
        
        /* 'X' animation */
        .navbar__toggle.is-active .bar:nth-child(2) { opacity: 0; }
        .navbar__toggle.is-active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
        .navbar__toggle.is-active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
        
        .navbar__menu {
            display: none;
            flex-direction: column;
            width: 100%;
            position: absolute;
            top: calc(var(--navbar-height) + var(--border-width));
            left: 0;
            background-color: var(--color-background);
            border-bottom: var(--border-style);
            z-index: 1000;
        }
        
        .navbar__menu.is-active { display: flex; }

.navbar__item {
            text-align: center;
            border-top: var(--border-style); /* Create harsh separators */
        }

.navbar__link {
            display: block;
            padding: 1.5rem;
            font-weight: var(--font-weight-bold);
            text-transform: uppercase;
            transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
        }
        
        /* On mobile, invert the colors for a stark hover effect */
        .navbar__link:hover,
        .navbar__link:focus {
            background-color: var(--color-foreground);
            color: var(--color-background);
        }
        
        .navbar__link--cta {
             /* In mobile, CTA is styled like other links but hover uses accent color */
        }

.navbar__link--cta:hover,
        .navbar__link--cta:focus {
            background-color: var(--color-accent);
            color: var(--color-foreground);
        }

/* A highly visible focus ring that fits the brutalist theme */
        :is(.navbar__toggle, .navbar__link):focus-visible {
            outline: var(--border-width) solid var(--color-accent);
            outline-offset: 3px;
        }

/*
        ========================================
        Desktop Navbar Styles (Responsive)
        ========================================
        */
        @media (min-width: 768px) {
            .navbar__toggle {
                display: none;
            }

.navbar__menu {
                display: flex;
                flex-direction: row;
                align-items: stretch; /* Make items full height */
                position: static;
                width: auto;
                background-color: transparent;
                border: none;
            }

.navbar__list {
                display: flex;
                align-items: stretch; /* Make items full height */
            }

.navbar__item {
                border-top: none;
                border-left: var(--border-style);
            }

.navbar__link {
                display: flex;
                align-items: center;
                height: 100%;
                padding: 0 1.5rem;
            }

/* Main link hover effect: color inversion */
            .navbar__link:not(.navbar__link--cta):hover,
            .navbar__link:not(.navbar__link--cta):focus {
                background-color: var(--color-foreground);
                color: var(--color-background);
            }
            
            /* CTA Button Styling for Desktop */
            .navbar__link--cta {
                background-color: var(--color-accent);
                color: var(--color-foreground);
            }
            
            /* CTA hover effect: black background with yellow text */
            .navbar__link--cta:hover,
            .navbar__link--cta:focus {
                background-color: var(--color-foreground);
                color: var(--color-accent);
            }
        }
    </style>
</head>
<body>

<header class="navbar" role="banner">
        <div class="navbar__container">
            <a href="#" class="navbar__brand" aria-label="Homepage">Brand</a>
            
            <button class="navbar__toggle" 
                    id="navbarToggle" 
                    aria-label="Toggle navigation" 
                    aria-controls="navbarMenu" 
                    aria-expanded="false">
                <span class="bar"></span>
                <span class="bar"></span>
                <span class="bar"></span>
            </button>
            
            <nav id="navbarMenu" class="navbar__menu" role="navigation" aria-labelledby="navbarToggle">
                <ul class="navbar__list">
                    <li class="navbar__item"><a href="#" class="navbar__link">Services</a></li>
                    <li class="navbar__item"><a href="#" class="navbar__link">Projects</a></li>
                    <li class="navbar__item"><a href="#" class="navbar__link">Journal</a></li>
                    <li class="navbar__item"><a href="#" class="navbar__link">Contact</a></li>
                    <li class="navbar__item navbar__item--cta">
                        <a href="#" class="navbar__link navbar__link--cta">Get Quote</a>
                    </li>
                </ul>
            </nav>
        </div>
    </header>
    
    <script>
        // A small, accessible script to toggle the mobile menu.
        document.addEventListener('DOMContentLoaded', function () {
            const navbarToggle = document.getElementById('navbarToggle');
            const navbarMenu = document.getElementById('navbarMenu');

if (navbarToggle && navbarMenu) {
                navbarToggle.addEventListener('click', function () {
                    navbarToggle.classList.toggle('is-active');
                    navbarMenu.classList.toggle('is-active');
                    const isExpanded = navbarToggle.getAttribute('aria-expanded') === 'true';
                    navbarToggle.setAttribute('aria-expanded', !isExpanded);
                });
            }
        });
    </script>
</body>
</html>