body {
            font-family: 'Arial', sans-serif;
            background-color: #f0f4f8;
            margin: 0;
            padding: 0;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        .main-content {
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
            padding: 30px;
            margin-top: 20px;
        }
        h1 {
            color: #333;
            text-align: center;
            margin-bottom: 30px;
        }
        .filter-buttons {
            display: flex;
            justify-content: center;
            margin-bottom: 30px;
        }
        .filter-btn {
            background-color: #e0e0e0;
            border: none;
            padding: 10px 20px;
            margin: 0 10px;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .filter-btn.active {
            background-color: #4CAF50;
            color: white;
        }
        .homework-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .homework-item {
            background-color: #ffffff;
            border-radius: 8px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            padding: 20px;
            transition: transform 0.3s;
        }
        .homework-item:hover {
            transform: translateY(-5px);
        }
        .homework-item h3 {
            color: #333;
            margin-top: 0;
        }
        .homework-item p {
            color: #666;
            margin: 10px 0;
        }
        .btn {
            display: inline-block;
            background-color: #4CAF50;
            color: white;
            padding: 10px 15px;
            border-radius: 5px;
            text-decoration: none;
            transition: background-color 0.3s;
        }
        .btn:hover {
            background-color: #45a049;
        }
        .completed {
            border-left: 5px solid #4CAF50;
        }
        @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700&display=swap');

        :root {
            --primary-color: #4e54c8;
            --secondary-color: #8f94fb;
            --accent-color: #ff6b6b;
            --text-color: #333;
            --bg-color: #f9f9f9;
        }

        body {
            font-family: 'Poppins', sans-serif;
            margin: 0;
            padding: 0;
            background-color: var(--bg-color);
            color: var(--text-color);
            line-height: 1.6;
        }

        .container {
            max-width: 1340px;
            margin: 0 auto;
            padding: 0 20px;
        }

        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }

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

        .logo {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }

        .search-bar {
            flex-grow: 1;
            margin: 0 20px;
            position: relative;
        }

        .search-bar input {
            width: 100%;
            padding: 12px 20px;
            border: none;
            border-radius: 30px;
            font-size: 16px;
            background-color: rgba(255,255,255,0.2);
            color: #fff;
            transition: all 0.3s ease;
        }

        .search-bar input::placeholder {
            color: rgba(255,255,255,0.7);
        }

        .search-bar input:focus {
            background-color: rgba(255,255,255,0.3);
            outline: none;
        }

        .ai-tools {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
        }

        .ai-tools i {
            font-size: 20px;
            margin-left: 15px;
            cursor: pointer;
            color: #fff;
            transition: all 0.3s ease;
        }

        .ai-tools i:hover {
            color: var(--accent-color);
            transform: scale(1.1);
        }

        .user-actions {
            display: flex;
            align-items: center;
        }

        .points-display {
            font-size: 18px;
            font-weight: bold;
            color: #fff;
            margin-right: 20px;
            background-color: rgba(255,255,255,0.2);
            padding: 5px 15px;
            border-radius: 20px;
        }

        .profile-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--accent-color);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #fff;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .profile-icon:hover {
            transform: scale(1.1);
        }

        .nav-bar {
            background-color: #fff;
            padding: 10px 0;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        .nav-bar ul {
            list-style-type: none;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
        }

        .nav-bar li {
            margin: 0 15px;
        }

        .nav-bar a {
            text-decoration: none;
            color: var(--text-color);
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .nav-bar a:hover {
            color: var(--primary-color);
        }

        .hero {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            padding: 100px 0;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('https://source.unsplash.com/random/1600x900?education') no-repeat center center;
            background-size: cover;
            opacity: 0.1;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .hero p {
            font-size: 20px;
            margin-bottom: 30px;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
        }

        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: #fff;
            padding: 12px 30px;
            text-decoration: none;
            font-weight: 600;
            border-radius: 30px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }

       

        .categories, .features, .learning-section {
            padding: 60px 0;
            background-color: #fff;
            margin: 40px 0;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .section-title {
            font-size: 32px;
            text-align: center;
            margin-bottom: 40px;
            color: var(--primary-color);
        }

        .category-list, .feature-grid, .learning-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .category-item, .feature-card, .learning-item {
            background-color: #fff;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .category-item:hover, .feature-card:hover, .learning-item:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }

        .feature-card img, .learning-item img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 10px;
            margin-bottom: 15px;
        }

        .feature-card h3, .learning-title {
            font-size: 20px;
            margin: 10px 0;
            color: var(--primary-color);
        }

        .feature-card p, .learning-subtitle {
            font-size: 14px;
            color: #666;
            margin-bottom: 15px;
        }

        footer {
            background-color: #333;
            color: #fff;
            padding: 40px 0;
        }

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

        .footer-section {
            flex: 1;
            margin-right: 20px;
        }

        .footer-section h4 {
            font-size: 18px;
            margin-bottom: 15px;
            color: var(--accent-color);
        }

        .footer-section ul {
            list-style: none;
            padding: 0;
        }

        .footer-section ul li {
            margin-bottom: 10px;
        }

        .footer-section ul li a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .footer-section ul li a:hover {
            color: #fff;
        }

        .social-icons {
            display: flex;
            gap: 15px;
        }

        .social-icon {
            color: #fff;
            font-size: 24px;
            transition: all 0.3s ease;
        }

        .social-icon:hover {
            transform: scale(1.2);
            color: var(--accent-color);
        }

        .copyright {
            margin-top: 30px;
            text-align: center;
            color: #ccc;
        }

        /* Animations */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes slideIn {
            from { transform: translateY(50px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }

        .fade-in {
            animation: fadeIn 1s ease-out;
        }

        .slide-in {
            animation: slideIn 0.5s ease-out;
        }