:root {
            --primary: #000000;
            --secondary: #3a0ca3;
            --accent: #7209b7;
            --light: #f8f9fa;
            --dark: #212529;
            --warning: #f72585;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --border-radius: 8px;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--dark);
            background-color: var(--light);
            padding-top: 70px;
        }

        a {
            text-decoration: none;
            color: var(--primary);
            transition: var(--transition);
        }

        a:hover {
            color:whitesmoke;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        .btn {
            display: inline-block;
            padding: 10px 20px;
            background-color: #6c757d ;
            color: rgb(255, 255, 255);
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 500;
        }

        .btn:hover {
            color: white;
            background-color: var(--dark);
            transform: translateY(-1px);
        }

        .btn-outline {
            background-color: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline:hover {
            background-color: var(--dark);
            color: white;
        }

        .section-title {
            text-align: center;
            margin-bottom: 2rem;
            font-size: 2rem;
            color: #000000;
        }

        .card {
            background: rgb(255, 255, 255);
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: var(--transition);
        }

        .card:hover {
            transform: translateY(0px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        /* Header Styles */
        header {
            background-color: #515356;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
        }

        .nav-menu {
            display: flex;
            list-style: none;
        }

        .nav-item {
            margin-left: 1.5rem;
        }

        .nav-link {
            color: var(--dark);
            font-weight: 500;
        }

        .nav-link:hover {
            color: var(--dark);
        }

        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }

        .hamburger {
            display: none;
            cursor: pointer;
        }

        .bar {
            display: block;
            width: 25px;
            height: 3px;
            margin: 5px auto;
            background-color: var(--dark);
            transition: var(--transition);
        }

        /* Hero Section */
        .hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('photo/Web Dev.jpg') center/cover no-repeat;
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5); 
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
}

.hero-content img {
    display: none; /
}

        /* Courses Section */
        .courses {
    padding: 5rem 0;
    background: #d1d6da;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 1rem;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.course-card {
    background: grey;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid #e2e8f0;
}

.course-card:hover {
    transform: translateY(0px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.course-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid #e2e8f0;
}

.course-content {
    padding: 1.5rem;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #cacbcd;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.course-description {
    color: #fafbfd;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-meta span {
    color: #4a5568;
    font-weight: 500;
    font-size: 0.9rem;
}

.btn {
    background:#667eea;
    color: white;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}
        /* Progress Section */
        .progress-container {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 3rem;
            box-shadow: var(--box-shadow);
        }

        .progress-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        .progress-title {
            font-size: 1.5rem;
            color: black;
        }

        .progress-item {
            margin-bottom: 1rem;
            padding: 1rem;
            background-color: var(--light);
            border-radius: var(--border-radius);
        }

        .progress-bar {
            height: 8px;
            background-color: var(--light-gray);
            border-radius: 4px;
            overflow: hidden;
            margin-top: 0.5rem;
        }

        .progress-fill {
            height: 100%;
            background-color: var(--dark);
            border-radius: 4px;
        }

        /* Quiz Section */
        .quiz-container {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 2rem;
            margin-bottom: 3rem;
            box-shadow: var(--box-shadow);
        }

        .quiz-header {
            margin-bottom: 1.5rem;
        }

        .quiz-question {
            font-size: 1.2rem;
            margin-bottom: 1rem;
        }

        .quiz-options {
            list-style: none;
            margin-bottom: 1.5rem;
        }

        .quiz-option {
            padding: 1rem;
            background-color: var(--light);
            border-radius: var(--border-radius);
            margin-bottom: 0.5rem;
            cursor: pointer;
            transition: var(--transition);
        }

        .quiz-option:hover {
            background-color: var(--light-gray);
        }

        .quiz-option.selected {
            background-color: var(--primary);
            color: white;
        }

        .quiz-feedback {
            padding: 1rem;
            border-radius: var(--border-radius);
            margin-bottom: 1rem;
            display: none;
        }

        .quiz-feedback.correct {
            background-color: rgba(76, 201, 240, 0.2);
            color: #0a58ca;
            display: block;
        }

        .quiz-feedback.incorrect {
            background-color: rgba(247, 37, 133, 0.2);
            color: #dc3545;
            display: block;
        }

        /* Course Detail Page */
        .course-detail-hero {
            padding: 2rem 0;
            background-color: var(--light);
            margin-bottom: 2rem;
        }

        .course-modules {
            margin-bottom: 3rem;
        }

        .module {
            margin-bottom: 1.5rem;
        }

        .module-header {
            padding: 1rem;
            background-color: var(--light-gray);
            border-radius: var(--border-radius);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .module-content {
            padding: 1rem;
            background-color: white;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
            display: none;
        }

        .module-content.active {
            display: block;
        }

        .lesson-item {
            padding: 0.75rem;
            border-bottom: 1px solid var(--light-gray);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .lesson-item:last-child {
            border-bottom: none;
        }

        .lesson-complete {
            color: var(--success);
        }

        /* Footer */
        footer {
            background-color: var(--dark);
            color: white;
            padding: 3rem 0;
        }

        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .footer-section {
            flex: 1;
            min-width: 200px;
            margin-bottom: 2rem;
        }

        .footer-title {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: var(--light);
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.5rem;
        }

        .footer-links a {
            color: var(--light-gray);
        }

        .footer-links a:hover {
            color: white;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* Page-specific styles */
        .page {
            display: none;
        }

        .page.active {
            display: block;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }

            .hamburger.active .bar:nth-child(2) {
                opacity: 0;
            }

            .hamburger.active .bar:nth-child(1) {
                transform: translateY(8px) rotate(45deg);
            }

            .hamburger.active .bar:nth-child(3) {
                transform: translateY(-8px) rotate(-45deg);
            }

            .nav-menu {
                position: fixed;
                left: -100%;
                top: 70px;
                flex-direction: column;
                background-color: white;
                width: 100%;
                text-align: center;
                transition: 0.3s;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
                padding: 1rem 0;
            }

            .nav-menu.active {
                left: 0;
            }

            .nav-item {
                margin: 1rem 0;
            }

            .hero-title {
                font-size: 2rem;
            }

            .courses-grid {
                grid-template-columns: 1fr;
            }
        }