* { 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: #333;
            background-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        :root {
            --primary: #2c3e50;
            --secondary: #1a5276;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #27ae60;
            --shadow: 0 5px 15px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
            --border-radius: 8px;
            --container-width: 1200px;
        }
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 0 4px; border-radius: 3px; }
        .main-header {
            background-color: var(--primary);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            font-family: 'Georgia', serif;
            letter-spacing: 1px;
        }
        .logo span { color: var(--accent); }
        .search-form {
            flex: 0 1 400px;
            margin: 0 20px;
        }
        .search-form form {
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            background: white;
        }
        .search-form input {
            flex: 1;
            border: none;
            padding: 12px 20px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0 25px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: var(--accent);
        }
        .nav-desktop {
            display: flex;
            gap: 1.5rem;
        }
        @media (max-width: 992px) {
            .nav-desktop { display: none; }
        }
        .nav-desktop a {
            color: var(--light);
            text-decoration: none;
            font-weight: 600;
            padding: 5px 10px;
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            background-color: rgba(255,255,255,0.15);
            color: #fff;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 992px) {
            .hamburger { display: block; }
        }
        .mobile-nav {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background-color: var(--dark);
            flex-direction: column;
            padding: 20px;
            display: none;
            z-index: 999;
            box-shadow: 0 10px 10px rgba(0,0,0,0.1);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: white;
            text-decoration: none;
            padding: 15px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
        }
        .mobile-nav a:hover {
            background-color: rgba(255,255,255,0.05);
            padding-left: 25px;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #f1f8ff;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }
        .breadcrumb a {
            color: var(--secondary);
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { color: #666; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0;
        }
        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        article h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        article h2 {
            font-size: 2rem;
            color: var(--secondary);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
        }
        article h3 {
            font-size: 1.5rem;
            color: #555;
            margin: 2rem 0 1rem;
        }
        article p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        article ul, article ol {
            margin-bottom: 1.5rem;
            padding-left: 2rem;
        }
        article li { margin-bottom: 0.7rem; }
        .featured-img {
            width: 100%;
            margin: 2rem 0;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .featured-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .featured-img img:hover {
            transform: scale(1.02);
        }
        .figcaption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 10px;
            background: #f9f9f9;
            font-size: 0.95rem;
        }
        .quote {
            border-left: 5px solid var(--accent);
            padding: 20px 30px;
            margin: 2.5rem 0;
            background: #fef9f9;
            font-style: italic;
            font-size: 1.2rem;
            color: #444;
        }
        .tip-box {
            background: #e8f4fc;
            border: 1px dashed #3498db;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        .tip-box h4 {
            color: #2c3e50;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 2.5rem 0;
        }
        .stat-card {
            background: var(--light);
            padding: 20px;
            border-radius: var(--border-radius);
            text-align: center;
            border-top: 5px solid var(--secondary);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .stat-card .number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary);
            line-height: 1;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            color: var(--primary);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
        }
        .rating-widget form, .comment-widget form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .rating-widget .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin: 10px 0;
        }
        .rating-widget .stars input { display: none; }
        .rating-widget .stars label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-widget .stars label:hover,
        .rating-widget .stars label:hover ~ label,
        .rating-widget .stars input:checked ~ label {
            color: #f39c12;
        }
        .form-group input, .form-group textarea, .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus, .form-group textarea:focus {
            outline: none;
            border-color: var(--secondary);
        }
        .form-group textarea {
            min-height: 120px;
            resize: vertical;
        }
        .submit-btn {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 14px;
            border-radius: 4px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .submit-btn:hover {
            background: var(--accent);
        }
        .toc-widget ul {
            list-style: none;
            padding-left: 0;
        }
        .toc-widget li { margin-bottom: 10px; }
        .toc-widget a {
            color: #555;
            text-decoration: none;
            display: block;
            padding: 8px 10px;
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .toc-widget a:hover {
            border-left-color: var(--accent);
            background: #f5f5f5;
            padding-left: 15px;
            color: var(--primary);
        }
        .longtail-links {
            background: #fff;
            padding: 40px 0;
            margin-top: 40px;
            border-top: 1px solid #eee;
            border-bottom: 1px solid #eee;
        }
        .web-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
        }
        .web-link {
            padding: 15px;
            background: #f8f9fa;
            border-radius: 6px;
            border: 1px solid #e9ecef;
            transition: var(--transition);
        }
        .web-link:hover {
            background: #e9ecef;
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--secondary);
            text-decoration: none;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .web-link a:hover { text-decoration: underline; }
        .main-footer {
            background: var(--primary);
            color: white;
            padding: 50px 0 20px;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
        }
        .footer-col h4 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--light);
        }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 12px; }
        .footer-col a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.95rem;
        }
        .copyright a { color: #aaa; }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .search-form { order: 3; flex: 1 1 100%; margin: 15px 0 0; }
            article { padding: 25px; }
            article h1 { font-size: 2.2rem; }
            article h2 { font-size: 1.8rem; }
            .stats-grid { grid-template-columns: 1fr; }
        }