Fixed Sidebar - CSS Tutorial

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <link rel="stylesheet" href="style.css">
    <script src="script.js" defer></script>
</head>
<body>
    <button class="menu-toggle" aria-label="Open menu" aria-expanded="false" aria-controls="sidebar">
        <span class="hamburger"></span>
    </button>
    
    <aside id="sidebar" class="sidebar" role="navigation" aria-label="Main navigation">
        <nav>
            <a href="#" aria-current="page">HOME</a>
            <a href="#">DEMO 01</a>
            <a href="#">DEMO 02</a>
            <a href="#">DEMO 03</a>
            <a href="#">DEMO 04</a>
            <a href="#">DEMO 05</a>
        </nav>
    
        <div class="searchBox" role="search">
            <label for="search">Search</label>
            <input id="search" type="text" placeholder="Search..." name="search">
        </div>
    </aside>
    
    <main class="container">
        <h1>Welcome to the CSS Tutorial</h1>
        <p>Scroll down the page to see the fixed sidebar in action.</p>
        
        <div class="demo-content">
            <h2>Section 1</h2>
            <p>This is a demonstration section to display the behavior of the fixed sidebar.</p>
        </div>
        
        <div class="demo-content">
            <h2>Section 2</h2>
            <p>The sidebar remains fixed while scrolling down the page.</p>
        </div>
        
        <div class="demo-content">
            <h2>Section 3</h2>
            <p>Test the responsiveness of the page by changing the size of the browser window.</p>
        </div>
        
        <div class="demo-content">
            <h2>Section 4</h2>
            <p>On mobile devices, the sidebar can be accessed via the hamburger menu.</p>
        </div>
    </main>
</body>
</html>

:root {
    --sidebar-bg: #f8f9fa;
    --sidebar-color: #333;
    --sidebar-hover: #007bff;
    --sidebar-width: 15%;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* Hamburger menu */
.menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 2000;
    background: none;
    border: none;
    padding: 10px;
    cursor: pointer;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: #3fb950;
    position: relative;
    transition: background 0.3s ease-in-out;
}

.hamburger::before,
.hamburger::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 2px;
    background: #3fb950;
    transition: transform 0.3s ease-in-out;
}

.hamburger::before { top: -6px; }
.hamburger::after { bottom: -6px; }

/* Hamburger animation */
.menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.menu-toggle[aria-expanded="true"] .hamburger::before {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .hamburger::after {
    transform: translateY(-6px) rotate(-45deg);
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100%;
    background-color: var(--sidebar-bg);
    box-shadow: var(--shadow);
    overflow-x: hidden;
    overflow-y: auto;
    z-index: 1000;
    padding: 20px 0;
    transition: transform 0.3s ease-in-out;
}

.sidebar a {
    display: block;
    padding: 12px 20px;
    color: var(--sidebar-color);
    text-decoration: none;
    font-size: 16px;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
    -webkit-text-fill-color: var(--sidebar-color);
}

.sidebar a:hover {
    color: var(--sidebar-hover);
    background-color: rgba(0,0,0,0.05);
    border-left-color: var(--sidebar-hover);
}

.searchBox {
    padding: 15px;
    margin-top: 10px;
}

.searchBox label {
    color: var(--sidebar-color);
    -webkit-text-fill-color: var(--sidebar-color);
}

.searchBox input[type=text] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.searchBox input[type=text]:focus {
    outline: none;
    border-color: var(--sidebar-hover);
}

.container {
    margin-left: var(--sidebar-width);
    padding: 20px;
    max-width: 1200px;
    min-height: 200vh; /* Increased height to demonstrate scrolling */
    transition: margin-left 0.3s ease-in-out;
    color: var(--fg, #333);
    -webkit-text-fill-color: var(--fg, #333);
}

.container h1 {
    margin-bottom: 20px;
}

/* Added demo content */
.demo-content {
    margin: 2rem 0;
    padding: 2rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    box-shadow: var(--shadow);
    color: var(--sidebar-color);
    -webkit-text-fill-color: var(--sidebar-color);
}

@media screen and (max-width: 1280px) {
    :root { --sidebar-width: 20%; }
}

@media screen and (max-width: 920px) {
    :root { --sidebar-width: 25%; }
}

@media screen and (max-width: 580px) {
    .menu-toggle {
        display: block;
    }
    
    .sidebar {
        --sidebar-width: 75%;
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar nav {
        padding-top: 30px;
    }
    
    .container {
        margin-left: 0;
        padding: 20px;
    }
    
    .container h1 {
        margin-top: 30px;
    }
}

document.addEventListener("DOMContentLoaded", function() {
    const menuToggle = document.querySelector(".menu-toggle");
    const sidebar = document.querySelector(".sidebar");
    
    // Toggle sidebar menu
    menuToggle.addEventListener("click", function() {
        const isExpanded = menuToggle.getAttribute("aria-expanded") === "true";
        menuToggle.setAttribute("aria-expanded", !isExpanded);
        sidebar.classList.toggle("active");
    });
    
    // Prevent default action on link click for demonstration
    sidebar.addEventListener("click", function(e) {
        const link = e.target.closest("nav a");
        if (link) {
            e.preventDefault();
            console.log("Clicked link: " + link.textContent);
            
            // Close the sidebar menu on mobile devices after clicking a link
            if (window.innerWidth <= 580 && sidebar.classList.contains("active")) {
                sidebar.classList.remove("active");
                menuToggle.setAttribute("aria-expanded", "false");
            }
        }
    });
    
    // Close sidebar when clicking outside of it
    document.addEventListener("click", function(e) {
        if (!sidebar.contains(e.target) && !menuToggle.contains(e.target) && sidebar.classList.contains("active")) {
            sidebar.classList.remove("active");
            menuToggle.setAttribute("aria-expanded", "false");
        }
    });
});