:root {
            --primary: #1a73e8;
            --primary-dark: #0d47a1;
            --secondary: #ff5722;
            --dark: #202124;
            --light: #f8f9fa;
            --gray: #5f6368;
            --border: #dadce0;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.6;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: #fff;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a i {
            color: var(--secondary);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--gray);
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .search-box {
            display: flex;
            margin-left: 30px;
            border: 1px solid var(--border);
            border-radius: 24px;
            overflow: hidden;
            padding: 5px 15px;
            background: var(--light);
        }
        .search-box input {
            border: none;
            outline: none;
            background: transparent;
            padding: 8px;
            width: 200px;
        }
        .search-box button {
            background: transparent;
            border: none;
            color: var(--gray);
            cursor: pointer;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--gray);
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: var(--light);
            border-bottom: 1px solid var(--border);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin-left: 10px;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--gray);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb li:last-child a {
            color: var(--primary);
            font-weight: 500;
        }
        main {
            padding: 40px 0;
        }
        .article-header {
            margin-bottom: 40px;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            color: var(--dark);
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: var(--radius);
            margin: 30px 0;
            box-shadow: var(--shadow);
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-content {
            font-size: 1.1rem;
        }
        .article-content h2 {
            font-size: 2rem;
            margin: 50px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
            color: var(--primary-dark);
        }
        .article-content h3 {
            font-size: 1.6rem;
            margin: 35px 0 15px;
            color: var(--dark);
        }
        .article-content p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .article-content .highlight {
            background-color: #e8f0fe;
            border-left: 4px solid var(--primary);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .article-content ul, .article-content ol {
            margin-left: 30px;
            margin-bottom: 20px;
        }
        .article-content li {
            margin-bottom: 10px;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            box-shadow: var(--shadow);
            border-radius: var(--radius);
            overflow: hidden;
        }
        .data-table th {
            background-color: var(--primary);
            color: white;
            text-align: left;
            padding: 15px;
        }
        .data-table td {
            padding: 15px;
            border-bottom: 1px solid var(--border);
        }
        .data-table tr:nth-child(even) {
            background-color: #f8f9fa;
        }
        .data-table tr:hover {
            background-color: #e8f0fe;
        }
        .car-card {
            display: flex;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
            margin: 25px 0;
            align-items: center;
            gap: 20px;
            transition: var(--transition);
        }
        .car-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
            border-color: var(--primary);
        }
        .car-icon {
            font-size: 3rem;
            color: var(--secondary);
        }
        .car-info h4 {
            font-size: 1.3rem;
            margin-bottom: 5px;
        }
        .rating {
            color: #ffc107;
            margin: 10px 0;
        }
        .difficulty {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        .easy { background: #e6f4ea; color: #137333; }
        .medium { background: #fef7e0; color: #b06000; }
        .hard { background: #fce8e6; color: #c5221f; }
        .sidebar {
            position: sticky;
            top: 120px;
            height: fit-content;
        }
        .toc {
            background-color: var(--light);
            border-radius: var(--radius);
            padding: 25px;
            margin-bottom: 30px;
            border: 1px solid var(--border);
        }
        .toc h3 {
            margin-bottom: 15px;
            color: var(--primary-dark);
        }
        .toc ul {
            list-style: none;
        }
        .toc li {
            margin-bottom: 12px;
        }
        .toc a {
            text-decoration: none;
            color: var(--gray);
            display: block;
            padding: 5px 0;
            border-left: 3px solid transparent;
            padding-left: 10px;
            transition: var(--transition);
        }
        .toc a:hover {
            color: var(--primary);
            border-left-color: var(--primary);
            background-color: rgba(26, 115, 232, 0.05);
        }
        .interactive-widget {
            background: linear-gradient(135deg, #1a73e8, #0d47a1);
            color: white;
            border-radius: var(--radius);
            padding: 25px;
            text-align: center;
            margin-bottom: 30px;
        }
        .interactive-widget h3 {
            margin-bottom: 15px;
            font-size: 1.5rem;
        }
        .interactive-widget p {
            margin-bottom: 20px;
            opacity: 0.9;
        }
        .btn {
            display: inline-block;
            background-color: var(--secondary);
            color: white;
            padding: 12px 25px;
            border-radius: 24px;
            text-decoration: none;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: #e64a19;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(255, 87, 34, 0.2);
        }
        .user-interaction {
            margin-top: 60px;
            padding-top: 40px;
            border-top: 2px solid var(--border);
        }
        .interaction-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            flex-wrap: wrap;
            gap: 20px;
        }
        .rating-widget {
            background-color: var(--light);
            border-radius: var(--radius);
            padding: 25px;
            margin-bottom: 40px;
        }
        .rating-widget h3 {
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin-bottom: 20px;
        }
        .stars i {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .stars i:hover,
        .stars i.active {
            color: #ffc107;
        }
        .rating-form form {
            display: grid;
            gap: 15px;
        }
        .rating-form input,
        .rating-form textarea {
            padding: 12px 15px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
        }
        .rating-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .comments-section h3 {
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .comment-form {
            background-color: var(--light);
            border-radius: var(--radius);
            padding: 25px;
            margin-bottom: 40px;
        }
        .comment-form form {
            display: grid;
            gap: 15px;
        }
        .form-group {
            display: grid;
            gap: 5px;
        }
        .comment-list {
            display: grid;
            gap: 25px;
        }
        .comment {
            border-bottom: 1px solid var(--border);
            padding-bottom: 25px;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
            flex-wrap: wrap;
            gap: 10px;
        }
        .comment-author {
            font-weight: 600;
            color: var(--dark);
        }
        .comment-date {
            color: var(--gray);
            font-size: 0.9rem;
        }
        .footer-links {
            background-color: var(--dark);
            color: white;
            padding: 50px 0 30px;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }
        .web-link {
            background-color: rgba(255,255,255,0.05);
            border-radius: var(--radius);
            padding: 20px;
            transition: var(--transition);
        }
        .web-link:hover {
            background-color: rgba(255,255,255,0.1);
            transform: translateY(-3px);
        }
        .web-link a {
            color: #8ab4f8;
            text-decoration: none;
            font-weight: 500;
            display: block;
            line-height: 1.5;
        }
        .web-link a:hover {
            color: #bbdefb;
            text-decoration: underline;
        }
        footer {
            background-color: #171717;
            color: #bdc1c6;
            padding: 30px 0;
            text-align: center;
        }
        .footer-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        .copyright {
            font-size: 0.9rem;
        }
        .footer-nav a {
            color: #bdc1c6;
            text-decoration: none;
            margin-left: 20px;
            font-size: 0.9rem;
        }
        .footer-nav a:hover {
            color: white;
        }
        @media (max-width: 1024px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: -1;
                margin-bottom: 40px;
            }
            .toc {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .nav-links,
            .search-box {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .mobile-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: white;
                box-shadow: var(--shadow);
                padding: 20px;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                z-index: 999;
            }
            .mobile-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .mobile-nav .nav-links {
                display: flex;
                flex-direction: column;
                gap: 15px;
            }
            .mobile-nav .search-box {
                display: flex;
                margin: 20px 0 0;
                width: 100%;
            }
            .mobile-nav .search-box input {
                width: 100%;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .interaction-header {
                flex-direction: column;
                align-items: flex-start;
            }
            .footer-container {
                flex-direction: column;
                text-align: center;
            }
            .footer-nav a {
                margin: 0 10px;
            }
        }
        @media (max-width: 480px) {
            .article-meta {
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
            .car-card {
                flex-direction: column;
                text-align: center;
            }
        }