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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>EduMaster LMS</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        /* Custom CSS for animations and transitions */
        .sidebar-item:hover .sidebar-icon {
            transform: translateX(5px);
        }
        
        .course-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        
        .progress-ring__circle {
            transition: stroke-dashoffset 0.5s;
            transform: rotate(-90deg);
            transform-origin: 50% 50%;
        }
        
        .chapter-accordion {
            transition: all 0.3s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .fade-in {
            animation: fadeIn 0.5s ease-in;
        }
    </style>
</head>
<body class="bg-gray-50 font-sans">
    <!-- Header -->
    <header class="bg-indigo-700 text-white shadow-lg">
        <div class="container mx-auto px-4 py-4 flex justify-between items-center">
            <div class="flex items-center space-x-2">
                <i class="fas fa-graduation-cap text-3xl"></i>
                <h1 class="text-2xl font-bold">EduMaster LMS</h1>
            </div>
            <div class="flex items-center space-x-6">
                <div class="relative">
                    <input type="text" placeholder="Search courses..." class="py-2 px-4 pr-10 rounded-full bg-indigo-600 text-white placeholder-indigo-300 focus:outline-none focus:ring-2 focus:ring-indigo-400">
                    <i class="fas fa-search absolute right-3 top-3 text-indigo-300"></i>
                </div>
                <div class="flex items-center space-x-2 cursor-pointer">
                    <img src="https://randomuser.me/api/portraits/women/44.jpg" alt="Profile" class="w-10 h-10 rounded-full border-2 border-indigo-400">
                    <span class="font-medium">Sarah K.</span>
                </div>
            </div>
        </div>
    </header>

    <div class="flex">
        <!-- Sidebar -->
        <aside class="w-64 bg-white shadow-md h-screen sticky top-0">
            <nav class="p-4">
                <ul class="space-y-2">
                    <li>
                        <a href="#" class="sidebar-item flex items-center py-3 px-4 rounded-lg bg-indigo-50 text-indigo-700 font-medium">
                            <i class="sidebar-icon fas fa-home mr-3 text-indigo-600 transition-transform"></i>
                            Dashboard
                        </a>
                    </li>
                    <li>
                        <a href="#" class="sidebar-item flex items-center py-3 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                            <i class="sidebar-icon fas fa-book mr-3 text-gray-500 transition-transform"></i>
                            My Courses
                        </a>
                    </li>
                    <li>
                        <a href="#" class="sidebar-item flex items-center py-3 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                            <i class="sidebar-icon fas fa-calendar-alt mr-3 text-gray-500 transition-transform"></i>
                            Schedule
                        </a>
                    </li>
                    <li>
                        <a href="#" class="sidebar-item flex items-center py-3 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                            <i class="sidebar-icon fas fa-chart-bar mr-3 text-gray-500 transition-transform"></i>
                            Progress
                        </a>
                    </li>
                    <li>
                        <a href="#" class="sidebar-item flex items-center py-3 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                            <i class="sidebar-icon fas fa-comments mr-3 text-gray-500 transition-transform"></i>
                            Discussions
                        </a>
                    </li>
                </ul>
                
                <div class="mt-8 pt-4 border-t border-gray-200">
                    <h3 class="text-xs font-semibold text-gray-500 uppercase tracking-wider mb-3 px-4">COURSES</h3>
                    <ul class="space-y-1">
                        <li>
                            <a href="#" class="sidebar-item flex items-center py-2 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                                <i class="sidebar-icon fas fa-laptop-code mr-3 text-gray-500 transition-transform"></i>
                                Web Development
                            </a>
                        </li>
                        <li>
                            <a href="#" class="sidebar-item flex items-center py-2 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                                <i class="sidebar-icon fas fa-mobile-alt mr-3 text-gray-500 transition-transform"></i>
                                Mobile Apps
                            </a>
                        </li>
                        <li>
                            <a href="#" class="sidebar-item flex items-center py-2 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                                <i class="sidebar-icon fas fa-chart-line mr-3 text-gray-500 transition-transform"></i>
                                Data Science
                            </a>
                        </li>
                        <li>
                            <a href="#" class="sidebar-item flex items-center py-2 px-4 rounded-lg hover:bg-indigo-50 text-gray-700 hover:text-indigo-700">
                                <i class="sidebar-icon fas fa-paint-brush mr-3 text-gray-500 transition-transform"></i>
                                Design
                            </a>
                        </li>
                    </ul>
                </div>
            </nav>
        </aside>

        <!-- Main Content -->
        <main class="flex-1 p-8">
            <div class="flex justify-between items-center mb-8">
                <h2 class="text-3xl font-bold text-gray-800">Web Development Fundamentals</h2>
                <div class="flex space-x-4">
                    <button class="bg-indigo-600 hover:bg-indigo-700 text-white px-4 py-2 rounded-lg flex items-center">
                        <i class="fas fa-share-alt mr-2"></i> Share
                    </button>
                    <button class="border border-indigo-600 text-indigo-600 hover:bg-indigo-50 px-4 py-2 rounded-lg flex items-center">
                        <i class="fas fa-download mr-2"></i> Resources
                    </button>
                </div>
            </div>

            <!-- Course Progress -->
            <div class="bg-white rounded-xl shadow-md p-6 mb-8">
                <div class="flex items-center justify-between">
                    <div>
                        <h3 class="text-lg font-semibold text-gray-800">Your Progress</h3>
                        <p class="text-gray-600">Complete lessons to unlock your certificate</p>
                    </div>
                    <div class="relative w-20 h-20">
                        <svg class="w-full h-full" viewBox="0 0 100 100">
                            <circle class="text-gray-200" stroke-width="8" stroke="currentColor" fill="transparent" r="40" cx="50" cy="50" />
                            <circle class="text-indigo-600 progress-ring__circle" stroke-width="8" stroke-linecap="round" stroke="currentColor" fill="transparent" r="40" cx="50" cy="50" stroke-dasharray="251.2" stroke-dashoffset="100.48" />
                        </svg>
                        <div class="absolute inset-0 flex items-center justify-center">
                            <span class="text-xl font-bold text-indigo-600">60%</span>
                        </div>
                    </div>
                </div>
                <div class="mt-4 w-full bg-gray-200 rounded-full h-2.5">
                    <div class="bg-indigo-600 h-2.5 rounded-full" style="width: 60%"></div>
                </div>
            </div>

            <!-- Course Content -->
            <div class="grid grid-cols-1 lg:grid-cols-3 gap-8">
                <!-- Chapters List -->
                <div class="lg:col-span-1">
                    <div class="bg-white rounded-xl shadow-md overflow-hidden">
                        <div class="bg-indigo-700 text-white px-6 py-4">
                            <h3 class="text-lg font-semibold">Course Content</h3>
                            <p class="text-indigo-200 text-sm">5 Chapters • 23 Lessons</p>
                        </div>
                        <div class="p-4">
                            <!-- Chapter 1 -->
                            <div class="mb-4">
                                <div class="chapter-accordion flex justify-between items-center bg-gray-50 px-4 py-3 rounded-lg cursor-pointer" onclick="toggleChapter(1)">
                                    <div class="flex items-center">
                                        <span class="bg-indigo-100 text-indigo-800 text-xs font-medium mr-3 px-2.5 py-0.5 rounded-full">1</span>
                                        <h4 class="font-medium text-gray-800">HTML Basics</h4>
                                    </div>
                                    <i class="fas fa-chevron-down text-gray-500 text-sm transition-transform transform" id="chapter-icon-1"></i>
                                </div>
                                <div class="chapter-content mt-2 pl-11 hidden" id="chapter-content-1">
                                    <ul class="space-y-2">
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-indigo-500 mr-3"></i>
                                            <span class="text-gray-700">Introduction to HTML</span>
                                            <span class="ml-auto text-xs bg-green-100 text-green-800 px-2 py-0.5 rounded-full">Completed</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-indigo-500 mr-3"></i>
                                            <span class="text-gray-700">HTML Document Structure</span>
                                            <span class="ml-auto text-xs bg-green-100 text-green-800 px-2 py-0.5 rounded-full">Completed</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-indigo-500 mr-3"></i>
                                            <span class="text-gray-700">HTML Elements and Tags</span>
                                            <span class="ml-auto text-xs bg-yellow-100 text-yellow-800 px-2 py-0.5 rounded-full">In Progress</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">HTML Attributes</span>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            
                            <!-- Chapter 2 -->
                            <div class="mb-4">
                                <div class="chapter-accordion flex justify-between items-center bg-gray-50 px-4 py-3 rounded-lg cursor-pointer" onclick="toggleChapter(2)">
                                    <div class="flex items-center">
                                        <span class="bg-indigo-100 text-indigo-800 text-xs font-medium mr-3 px-2.5 py-0.5 rounded-full">2</span>
                                        <h4 class="font-medium text-gray-800">CSS Fundamentals</h4>
                                    </div>
                                    <i class="fas fa-chevron-down text-gray-500 text-sm transition-transform transform" id="chapter-icon-2"></i>
                                </div>
                                <div class="chapter-content mt-2 pl-11 hidden" id="chapter-content-2">
                                    <ul class="space-y-2">
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Introduction to CSS</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">CSS Selectors</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Box Model</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Flexbox Layout</span>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            
                            <!-- Chapter 3 -->
                            <div class="mb-4">
                                <div class="chapter-accordion flex justify-between items-center bg-gray-50 px-4 py-3 rounded-lg cursor-pointer" onclick="toggleChapter(3)">
                                    <div class="flex items-center">
                                        <span class="bg-indigo-100 text-indigo-800 text-xs font-medium mr-3 px-2.5 py-0.5 rounded-full">3</span>
                                        <h4 class="font-medium text-gray-800">JavaScript Essentials</h4>
                                    </div>
                                    <i class="fas fa-chevron-down text-gray-500 text-sm transition-transform transform" id="chapter-icon-3"></i>
                                </div>
                                <div class="chapter-content mt-2 pl-11 hidden" id="chapter-content-3">
                                    <ul class="space-y-2">
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">JavaScript Basics</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">DOM Manipulation</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Events</span>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            
                            <!-- Chapter 4 -->
                            <div class="mb-4">
                                <div class="chapter-accordion flex justify-between items-center bg-gray-50 px-4 py-3 rounded-lg cursor-pointer" onclick="toggleChapter(4)">
                                    <div class="flex items-center">
                                        <span class="bg-indigo-100 text-indigo-800 text-xs font-medium mr-3 px-2.5 py-0.5 rounded-full">4</span>
                                        <h4 class="font-medium text-gray-800">Responsive Design</h4>
                                    </div>
                                    <i class="fas fa-chevron-down text-gray-500 text-sm transition-transform transform" id="chapter-icon-4"></i>
                                </div>
                                <div class="chapter-content mt-2 pl-11 hidden" id="chapter-content-4">
                                    <ul class="space-y-2">
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Media Queries</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Responsive Images</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Mobile-First Approach</span>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                            
                            <!-- Chapter 5 -->
                            <div class="mb-4">
                                <div class="chapter-accordion flex justify-between items-center bg-gray-50 px-4 py-3 rounded-lg cursor-pointer" onclick="toggleChapter(5)">
                                    <div class="flex items-center">
                                        <span class="bg-indigo-100 text-indigo-800 text-xs font-medium mr-3 px-2.5 py-0.5 rounded-full">5</span>
                                        <h4 class="font-medium text-gray-800">Final Project</h4>
                                    </div>
                                    <i class="fas fa-chevron-down text-gray-500 text-sm transition-transform transform" id="chapter-icon-5"></i>
                                </div>
                                <div class="chapter-content mt-2 pl-11 hidden" id="chapter-content-5">
                                    <ul class="space-y-2">
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Project Planning</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Implementation</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Testing & Debugging</span>
                                        </li>
                                        <li class="flex items-center py-2 px-3 rounded-lg hover:bg-indigo-50 cursor-pointer">
                                            <i class="fas fa-play-circle text-gray-400 mr-3"></i>
                                            <span class="text-gray-500">Deployment</span>
                                        </li>
                                    </ul>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                
                <!-- Lesson Content -->
                <div class="lg:col-span-2">
                    <div class="bg-white rounded-xl shadow-md overflow-hidden fade-in">
                        <div class="p-6 border-b border-gray-200">
                            <div class="flex justify-between items-center mb-4">
                                <div>
                                    <span class="bg-indigo-100 text-indigo-800 text-xs font-medium px-2.5 py-0.5 rounded-full">Lesson 3</span>
                                    <h3 class="text-2xl font-bold text-gray-800 mt-2">HTML Elements and Tags</h3>
                                </div>
                                <div class="flex space-x-2">
                                    <button class="p-2 rounded-full bg-gray-100 text-gray-600 hover:bg-gray-200">
                                        <i class="fas fa-bookmark"></i>
                                    </button>
                                    <button class="p-2 rounded-full bg-gray-100 text-gray-600 hover:bg-gray-200">
                                        <i class="fas fa-ellipsis-v"></i>
                                    </button>
                                </div>
                            </div>
                            <div class="flex items-center text-sm text-gray-500 space-x-4">
                                <span><i class="fas fa-clock mr-1"></i> 25 min</span>
                                <span><i class="fas fa-chart-line mr-1"></i> Intermediate</span>
                                <span><i class="fas fa-calendar-alt mr-1"></i> Last updated: June 15, 2023</span>
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                                <h4 class="text-lg font-semibold mb-3">Understanding HTML Elements</h4>
                                <p class="mb-4 text-gray-700">HTML elements are the building blocks of any webpage. They consist of tags that define the structure and content of your document.</p>
                                
                                <div class="bg-gray-50 p-4 rounded-lg mb-6">
                                    <pre class="text-sm text-gray-800"><code>&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;My Page&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;This is a Heading&lt;/h1&gt;
    &lt;p&gt;This is a paragraph.&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
                                </div>
                                
                                <h4 class="text-lg font-semibold mb-3">Common HTML Elements</h4>
                                <ul class="list-disc pl-5 mb-6 space-y-2 text-gray-700">
                                    <li><code>&lt;h1&gt;</code> to <code>&lt;h6&gt;</code>: Heading elements</li>
                                    <li><code>&lt;p&gt;</code>: Paragraph element</li>
                                    <li><code>&lt;a&gt;</code>: Anchor element for links</li>
                                    <li><code>&lt;img&gt;</code>: Image element</li>
                                    <li><code>&lt;div&gt;</code>: Division or section element</li>
                                    <li><code>&lt;span&gt;</code>: Inline container element</li>
                                </ul>
                                
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                                        </div>
                                        <div class="ml-3">
                                            <h5 class="text-sm font-medium text-indigo-800">Pro Tip</h5>
                                            <p class="text-sm text-indigo-700">Always close your HTML tags properly to avoid rendering issues. Some tags like <code>&lt;img&gt;</code> are self-closing.</p>
                                        </div>
                                    </div>
                                </div>
                                
                                <h4 class="text-lg font-semibold mb-3">Nesting Elements</h4>
                                <p class="mb-4 text-gray-700">HTML elements can be nested inside other elements to create more complex structures.</p>
                                
                                <div class="bg-gray-50 p-4 rounded-lg mb-6">
                                    <pre class="text-sm text-gray-800"><code>&lt;div class="container"&gt;
    &lt;h1&gt;Welcome&lt;/h1&gt;
    &lt;p&gt;This is a &lt;span class="highlight"&gt;highlighted&lt;/span&gt; text.&lt;/p&gt;
    &lt;a href="#"&gt;&lt;img src="image.jpg" alt="Example"&gt;&lt;/a&gt;
&lt;/div&gt;</code></pre>
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                            <h3 class="text-lg font-semibold text-gray-800">Lesson Resources</h3>
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