* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #4f46e5;
            --secondary: #10b981;
            --accent: #f59e0b;
            --dark: #1f2937;
            --light: #f9fafb;
            --gray: #6b7280;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        body {
            background-color: var(--light);
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 24px;
            background: var(--primary);
            color: white;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            border: none;
            transition: var(--transition);
        }
        .btn:hover {
            background: #4338ca;
            transform: translateY(-2px);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }
        .logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--accent);
        }
        .logo a:hover {
            color: var(--primary);
        }
        .desktop-nav ul {
            display: flex;
            gap: 30px;
        }
        .desktop-nav a {
            font-weight: 600;
            padding: 8px 0;
            position: relative;
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .mobile-nav {
            position: fixed;
            top: 0;
            left: -100%;
            width: 80%;
            height: 100vh;
            background: white;
            box-shadow: var(--shadow);
            padding: 30px;
            transition: var(--transition);
            z-index: 1001;
        }
        .mobile-nav.active {
            left: 0;
        }
        .mobile-nav ul {
            margin-top: 40px;
        }
        .mobile-nav li {
            margin-bottom: 20px;
        }
        .mobile-nav a {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .close-menu {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
        }
        .overlay.active {
            display: block;
        }
        .breadcrumb {
            padding: 15px 0;
            background: #f3f4f6;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            margin: 0 8px;
            color: var(--gray);
        }
        main {
            padding: 40px 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 2px solid #e5e7eb;
        }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--dark);
            margin-bottom: 15px;
            line-height: 1.2;
        }
        .meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            color: var(--gray);
            font-size: 0.95rem;
            flex-wrap: wrap;
        }
        .meta span i {
            margin-right: 5px;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 40px;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .article-content h2 {
            font-size: 2rem;
            color: var(--primary);
            margin: 30px 0 15px;
            padding-bottom: 10px;
            border-bottom: 2px dashed #e5e7eb;
        }
        .article-content h3 {
            font-size: 1.5rem;
            color: var(--secondary);
            margin: 25px 0 10px;
        }
        .article-content p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            text-align: justify;
        }
        .article-content strong {
            color: var(--dark);
            font-weight: 700;
        }
        .highlight {
            background: #fef3c7;
            padding: 20px;
            border-left: 5px solid var(--accent);
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .featured-image {
            margin: 30px 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 10px;
            color: var(--gray);
            background: #f9fafb;
        }
        .tip-box {
            background: #dbeafe;
            border: 2px solid var(--primary);
            padding: 20px;
            border-radius: 12px;
            margin: 25px 0;
        }
        .tip-box h4 {
            color: var(--primary);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .level-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .level-card {
            background: white;
            border: 2px solid #e5e7eb;
            border-radius: 10px;
            padding: 20px;
            transition: var(--transition);
        }
        .level-card:hover {
            border-color: var(--secondary);
            transform: translateY(-5px);
        }
        .level-card h4 {
            color: var(--dark);
            margin-bottom: 10px;
        }
        .interactive-section {
            margin: 40px 0;
            padding: 30px;
            background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
            border-radius: 12px;
            text-align: center;
        }
        .interactive-section h3 {
            margin-bottom: 20px;
        }
        .search-box, .comment-form, .rating-form {
            background: white;
            padding: 30px;
            border-radius: 12px;
            margin-bottom: 40px;
            box-shadow: var(--shadow);
        }
        .search-box h3, .comment-form h3, .rating-form h3 {
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-group input, .form-group textarea, .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #d1d5db;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus, .form-group textarea:focus, .form-group select:focus {
            border-color: var(--primary);
            outline: none;
        }
        .stars {
            display: flex;
            gap: 10px;
            justify-content: center;
            margin: 20px 0;
        }
        .star {
            font-size: 2rem;
            color: #d1d5db;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: var(--accent);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            color: var(--primary);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e5e7eb;
        }
        .popular-levels li {
            padding: 12px 0;
            border-bottom: 1px solid #e5e7eb;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .popular-levels li:last-child {
            border-bottom: none;
        }
        .popular-levels a:hover {
            color: var(--primary);
        }
        .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag {
            background: #e0e7ff;
            color: var(--primary);
            padding: 8px 15px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .tag:hover {
            background: var(--primary);
            color: white;
        }
        .long-tail-links {
            background: #1f2937;
            padding: 50px 0;
            margin-top: 60px;
        }
        .web-link {
            display: inline-block;
            background: #374151;
            color: #d1d5db;
            padding: 12px 20px;
            margin: 0 10px 15px 0;
            border-radius: 6px;
            transition: var(--transition);
        }
        .web-link:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        .links-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .links-container h3 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.5rem;
        }
        footer {
            background: #111827;
            color: #9ca3af;
            padding: 50px 0 30px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.2rem;
        }
        .footer-col ul li {
            margin-bottom: 12px;
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #374151;
            font-size: 0.9rem;
        }
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: #374151;
            border-radius: 50%;
            color: white;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background: var(--primary);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .article-content {
                padding: 25px;
            }
            .content-wrapper {
                gap: 25px;
            }
            .level-list {
                grid-template-columns: 1fr;
            }
            .search-box, .comment-form, .rating-form {
                padding: 20px;
            }
        }