:root {
            --primary: #2a5caa;
            --primary-dark: #1e407a;
            --secondary: #ff6b35;
            --accent: #00c9b7;
            --dark: #1a1a2e;
            --light: #f8f9fa;
            --gray: #6c757d;
            --gray-light: #e9ecef;
            --success: #28a745;
            --warning: #ffc107;
            --danger: #dc3545;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            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: #fefefe;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: white;
            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: 2rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .logo span {
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            font-size: 1.05rem;
            transition: var(--transition);
            padding: 5px 0;
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: var(--primary);
            background: none;
            border: none;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--gray-light);
            padding: 12px 0;
            font-size: 0.9rem;
            margin-bottom: 30px;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 10px;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .current {
            color: var(--gray);
        }
        .search-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: white;
            padding: 40px 0;
            border-radius: var(--radius);
            margin: 30px 0;
            text-align: center;
        }
        .search-section h2 {
            margin-bottom: 20px;
            font-size: 2rem;
        }
        .search-form {
            max-width: 700px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-form input {
            flex-grow: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-form button {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 0 35px;
            cursor: pointer;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: #e55a2b;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 40px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 40px;
            border-bottom: 3px solid var(--gray-light);
            padding-bottom: 25px;
        }
        .article-header h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: var(--dark);
            margin-bottom: 15px;
        }
        .meta-info {
            display: flex;
            gap: 20px;
            color: var(--gray);
            font-size: 0.95rem;
        }
        .meta-info span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .article-image {
            width: 100%;
            border-radius: var(--radius);
            overflow: hidden;
            margin: 30px 0;
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
        }
        .article-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .article-image img:hover {
            transform: scale(1.02);
        }
        .article-body h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin: 50px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        .article-body h3 {
            font-size: 1.6rem;
            color: var(--dark);
            margin: 35px 0 15px;
        }
        .article-body p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight-box {
            background-color: #f0f7ff;
            border-left: 5px solid var(--primary);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .highlight-box p {
            margin-bottom: 0;
            font-weight: 500;
        }
        .item-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }
        .item-card {
            border: 1px solid var(--gray-light);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
            transition: var(--transition);
            background: white;
        }
        .item-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .item-card img {
            max-width: 100%;
            height: auto;
            margin-bottom: 15px;
        }
        .item-card h4 {
            color: var(--primary);
            margin-bottom: 10px;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            color: var(--primary);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--gray-light);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-links ul {
            list-style: none;
        }
        .sidebar-links li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed #eee;
        }
        .sidebar-links a {
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition);
            display: block;
        }
        .sidebar-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .sidebar-links i {
            color: var(--accent);
            margin-right: 10px;
        }
        .interactive-section {
            margin: 60px 0;
            padding: 40px;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
            border-radius: var(--radius);
        }
        .interactive-section h2 {
            text-align: center;
            color: var(--primary-dark);
            margin-bottom: 40px;
        }
        .tabs {
            display: flex;
            border-bottom: 2px solid var(--gray-light);
            margin-bottom: 30px;
        }
        .tab-button {
            padding: 15px 30px;
            background: none;
            border: none;
            font-weight: 600;
            color: var(--gray);
            cursor: pointer;
            position: relative;
            transition: var(--transition);
        }
        .tab-button.active {
            color: var(--primary);
        }
        .tab-button.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--secondary);
        }
        .tab-content {
            display: none;
            animation: fadeIn 0.5s ease;
        }
        .tab-content.active {
            display: block;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .comment-form, .rating-form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .form-group label {
            font-weight: 600;
            color: var(--dark);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            padding: 15px;
            border: 1px solid #ccc;
            border-radius: var(--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);
            box-shadow: 0 0 0 3px rgba(42, 92, 170, 0.1);
        }
        .stars {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: var(--gray-light);
            cursor: pointer;
        }
        .stars .star:hover,
        .stars .star.active {
            color: var(--warning);
        }
        .btn {
            padding: 15px 30px;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            align-self: flex-start;
        }
        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(42, 92, 170, 0.2);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #e55a2b;
        }
        .longtail-links {
            margin: 60px 0 40px;
            padding: 40px;
            background-color: var(--dark);
            color: white;
            border-radius: var(--radius);
        }
        .longtail-links h2 {
            text-align: center;
            margin-bottom: 30px;
            color: white;
        }
        .web-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }
        .web-link {
            background-color: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .web-link:hover {
            background-color: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--accent);
            text-decoration: none;
            font-weight: 500;
            display: block;
        }
        .web-link a:hover {
            text-decoration: underline;
        }
        .site-footer {
            background-color: var(--dark);
            color: #aaa;
            padding: 60px 0 30px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h3 {
            color: white;
            margin-bottom: 25px;
            font-size: 1.3rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            color: white;
            text-decoration: none;
            transition: var(--transition);
        }
        .social-links a:hover {
            background-color: var(--primary);
            transform: translateY(-5px);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #777;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .main-nav.active {
                max-height: 400px;
                margin-top: 20px;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
                padding: 15px 0;
                border-bottom: 1px solid #eee;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .search-form {
                flex-direction: column;
                border-radius: var(--radius);
            }
            .search-form input,
            .search-form button {
                width: 100%;
                border-radius: var(--radius);
                margin-bottom: 10px;
            }
            .article-content,
            .interactive-section,
            .sidebar-widget {
                padding: 25px;
            }
            .item-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
            .tabs {
                flex-wrap: wrap;
            }
            .web-links-grid {
                grid-template-columns: 1fr;
            }
        }
        .text-primary { color: var(--primary); }
        .text-secondary { color: var(--secondary); }
        .text-accent { color: var(--accent); }
        .text-bold { font-weight: 700; }
        .text-center { text-align: center; }
        .mb-20 { margin-bottom: 20px; }
        .mb-30 { margin-bottom: 30px; }
        .mt-30 { margin-top: 30px; }
        .emoji { font-size: 1.2em; }