:root {
            --primary-color: #4361ee;
            --secondary-color: #3a0ca3;
            --accent-color: #f72585;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --gray-color: #6c757d;
            --success-color: #4cc9f0;
            --border-radius: 12px;
            --box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-icon {
            color: var(--accent-color);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            transition: var(--transition);
            padding: 8px 5px;
            position: relative;
        }
        nav a:hover {
            color: var(--success-color);
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent-color);
            transition: var(--transition);
        }
        nav a:hover::after {
            width: 100%;
        }
        .search-box {
            display: flex;
            background: white;
            border-radius: 50px;
            overflow: hidden;
            padding: 5px;
            width: 250px;
        }
        .search-box input {
            border: none;
            padding: 10px 15px;
            flex-grow: 1;
            outline: none;
            font-size: 1rem;
        }
        .search-box button {
            background: var(--accent-color);
            border: none;
            color: white;
            padding: 10px 20px;
            border-radius: 50px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: var(--secondary-color);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #e9ecef;
            font-size: 0.95rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 40px 0;
            background: #fff;
        }
        .article-header {
            margin-bottom: 40px;
            text-align: center;
            padding: 30px;
            background: linear-gradient(to right, #f8f9fa, #e9ecef);
            border-radius: var(--border-radius);
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            color: var(--secondary-color);
            line-height: 1.2;
        }
        .meta-info {
            display: flex;
            justify-content: center;
            gap: 20px;
            color: var(--gray-color);
            font-size: 0.95rem;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .meta-info span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-content {
            font-size: 1.1rem;
        }
        .article-content h2 {
            font-size: 2rem;
            margin: 40px 0 20px;
            color: var(--primary-color);
            padding-bottom: 10px;
            border-bottom: 3px solid var(--accent-color);
        }
        .article-content h3 {
            font-size: 1.5rem;
            margin: 30px 0 15px;
            color: var(--secondary-color);
        }
        .article-content p {
            margin-bottom: 25px;
            text-align: justify;
        }
        .article-content strong {
            color: var(--secondary-color);
            font-weight: 700;
        }
        .article-content em {
            color: var(--accent-color);
            font-style: italic;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e0f7fa, #bbdefb);
            border-left: 5px solid var(--primary-color);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            box-shadow: var(--box-shadow);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            text-align: center;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border-top: 5px solid var(--success-color);
        }
        .stat-card:hover {
            transform: translateY(-10px);
        }
        .stat-card h4 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .featured-image {
            width: 100%;
            border-radius: var(--border-radius);
            margin: 30px 0;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
        }
        .featured-image:hover {
            transform: scale(1.01);
        }
        .sidebar {
            background: #f8f9fa;
            padding: 25px;
            border-radius: var(--border-radius);
            align-self: start;
            position: sticky;
            top: 120px;
            box-shadow: var(--box-shadow);
        }
        .sidebar h3 {
            color: var(--secondary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-color);
        }
        .toc ul {
            list-style: none;
            padding-left: 15px;
        }
        .toc li {
            margin-bottom: 12px;
        }
        .toc a {
            color: var(--dark-color);
            text-decoration: none;
            transition: var(--transition);
            display: block;
            padding: 8px 10px;
            border-radius: 8px;
        }
        .toc a:hover {
            background-color: var(--primary-color);
            color: white;
            padding-left: 15px;
        }
        .download-cta {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 30px;
            border-radius: var(--border-radius);
            text-align: center;
            margin-top: 30px;
        }
        .download-cta h3 {
            color: white;
            border: none;
        }
        .btn {
            display: inline-block;
            background: var(--accent-color);
            color: white;
            padding: 15px 35px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 1.1rem;
            margin-top: 20px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background: #d63384;
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(247, 37, 133, 0.3);
        }
        .interactive-section {
            margin: 50px 0;
            padding: 30px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
        }
        .rating-form, .comment-form {
            margin-top: 25px;
        }
        .stars {
            display: flex;
            gap: 10px;
            margin: 15px 0;
            justify-content: center;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: gold;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark-color);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 15px;
            border: 2px solid #e9ecef;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }
        .web-links {
            background: #212529;
            color: white;
            padding: 40px 20px;
        }
        .web-links .container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }
        .web-link a {
            color: #adb5bd;
            text-decoration: none;
            display: block;
            padding: 10px 15px;
            background: #343a40;
            border-radius: 8px;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .web-link a:hover {
            color: white;
            background: var(--primary-color);
            transform: translateX(10px);
        }
        footer {
            background: #1a1d20;
            color: #adb5bd;
            padding: 40px 20px 20px;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 25px;
        }
        .social-links {
            display: flex;
            gap: 20px;
        }
        .social-links a {
            color: #adb5bd;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        .social-links a:hover {
            color: var(--accent-color);
            transform: translateY(-5px);
        }
        .copyright {
            font-size: 0.9rem;
            border-top: 1px solid #343a40;
            padding-top: 20px;
            width: 100%;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            nav ul {
                gap: 20px;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 20px;
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                gap: 15px;
            }
            .search-box {
                width: 100%;
                margin-top: 15px;
                order: 2;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .article-header h1 {
                font-size: 1.8rem;
            }
            .article-content h2 {
                font-size: 1.7rem;
            }
            .btn {
                padding: 12px 25px;
            }
        }