:root {
            --primary-dark: #1a365d;
            --primary: #2d4a8a;
            --primary-light: #4c7ac9;
            --accent: #e53e3e;
            --accent-light: #fc8181;
            --text-dark: #2d3748;
            --text: #4a5568;
            --text-light: #718096;
            --bg-light: #f7fafc;
            --bg-white: #ffffff;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --radius: 8px;
            --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(--text);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--bg-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: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -1px;
            display: flex;
            align-items: center;
        }
        .logo i {
            color: var(--accent);
            margin-right: 10px;
            font-size: 2rem;
        }
        .desktop-nav ul {
            display: flex;
            gap: 30px;
        }
        .desktop-nav a {
            font-weight: 600;
            color: var(--text-dark);
            padding: 8px 0;
            position: relative;
        }
        .desktop-nav a:hover {
            color: var(--primary);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--accent);
            transition: var(--transition);
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .mobile-toggle {
            display: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
            background: none;
            border: none;
        }
        .mobile-nav {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background-color: var(--bg-white);
            box-shadow: var(--shadow);
            padding: 20px;
            transform: translateY(-150%);
            opacity: 0;
            transition: var(--transition);
            z-index: 999;
        }
        .mobile-nav.active {
            transform: translateY(0);
            opacity: 1;
        }
        .mobile-nav ul {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .mobile-nav a {
            font-weight: 600;
            color: var(--text-dark);
            display: block;
            padding: 10px;
            border-radius: var(--radius);
        }
        .mobile-nav a:hover {
            background-color: var(--bg-light);
            color: var(--primary);
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: var(--bg-white);
            border-bottom: 1px solid #e2e8f0;
            margin-bottom: 30px;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 10px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            color: white;
            padding: 50px 0;
            border-radius: var(--radius);
            margin-bottom: 40px;
            text-align: center;
        }
        .hero-title {
            font-size: 2.8rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 30px;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-input {
            flex: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-btn {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .search-btn:hover {
            background-color: var(--accent-light);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin-bottom: 50px;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background-color: var(--bg-white);
            padding: 40px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid #e2e8f0;
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .author {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .author img {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            object-fit: cover;
        }
        h1 {
            color: var(--primary-dark);
            font-size: 2.5rem;
            margin-bottom: 25px;
            line-height: 1.3;
        }
        h2 {
            color: var(--primary);
            font-size: 2rem;
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-light);
        }
        h3 {
            color: var(--text-dark);
            font-size: 1.6rem;
            margin: 30px 0 15px;
        }
        h4 {
            color: var(--text);
            font-size: 1.3rem;
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--text-dark);
            background-color: #ebf8ff;
            padding: 20px;
            border-left: 5px solid var(--primary-light);
            border-radius: var(--radius);
            margin-bottom: 30px;
        }
        .highlight-box {
            background-color: #fffaf0;
            border-left: 5px solid var(--accent);
            padding: 25px;
            margin: 30px 0;
            border-radius: var(--radius);
        }
        .highlight-box h4 {
            color: var(--accent);
            margin-top: 0;
        }
        .img-container {
            margin: 30px auto;
            text-align: center;
        }
        .img-container img {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            max-width: 800px;
            margin: 0 auto;
        }
        .img-caption {
            font-style: italic;
            color: var(--text-light);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        ul.content-list {
            list-style: disc;
            margin-left: 25px;
            margin-bottom: 25px;
        }
        ul.content-list li {
            margin-bottom: 10px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            box-shadow: 0 0 10px rgba(0,0,0,0.05);
        }
        th, td {
            padding: 15px;
            text-align: left;
            border-bottom: 1px solid #e2e8f0;
        }
        th {
            background-color: var(--primary);
            color: white;
            font-weight: 600;
        }
        tr:hover {
            background-color: #f5f9ff;
        }
        blockquote {
            border-left: 5px solid var(--primary-light);
            padding-left: 25px;
            margin: 30px 0;
            font-style: italic;
            color: var(--text-dark);
            background-color: #f8fafc;
            padding: 25px;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .term {
            font-weight: bold;
            color: var(--primary);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: var(--bg-white);
            padding: 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.4rem;
            color: var(--primary-dark);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        .toc ul {
            padding-left: 0;
        }
        .toc li {
            margin-bottom: 12px;
        }
        .toc a {
            color: var(--text);
            display: block;
            padding: 8px 15px;
            border-radius: var(--radius);
            background-color: var(--bg-light);
            border-left: 4px solid transparent;
        }
        .toc a:hover {
            background-color: #e6f0ff;
            border-left-color: var(--primary);
            color: var(--primary);
        }
        .popular-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 0;
            border-bottom: 1px dashed #e2e8f0;
        }
        .popular-links a:hover {
            color: var(--primary);
        }
        .popular-links i {
            color: var(--accent);
        }
        .rating-section, .comments-section {
            background-color: var(--bg-white);
            padding: 40px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin-bottom: 40px;
        }
        .section-title {
            font-size: 1.8rem;
            color: var(--primary-dark);
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .rating-form, .comment-form {
            display: grid;
            gap: 20px;
            margin-bottom: 30px;
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            font-size: 2rem;
            color: #e2e8f0;
            margin-bottom: 15px;
        }
        .rating-stars .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: #fbbf24;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        label {
            font-weight: 600;
            color: var(--text-dark);
        }
        input, textarea, select {
            padding: 15px;
            border: 1px solid #cbd5e0;
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(45, 74, 138, 0.1);
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        .submit-btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 16px 30px;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            justify-self: start;
        }
        .submit-btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        .comments-list {
            margin-top: 40px;
        }
        .comment {
            padding: 25px;
            border: 1px solid #e2e8f0;
            border-radius: var(--radius);
            margin-bottom: 25px;
            background-color: #fcfcfc;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
            flex-wrap: wrap;
            gap: 10px;
        }
        .comment-author {
            font-weight: bold;
            color: var(--primary-dark);
        }
        .comment-date {
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .comment-rating {
            color: #f59e0b;
        }
        .footer-links {
            background-color: var(--primary-dark);
            padding: 50px 0 30px;
            margin-top: 60px;
        }
        .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);
            padding: 20px;
            border-radius: var(--radius);
            border-left: 4px solid var(--accent);
        }
        .web-link a {
            color: #e2e8f0;
            display: block;
            font-size: 1.05rem;
            transition: var(--transition);
        }
        .web-link a:hover {
            color: white;
            transform: translateX(5px);
        }
        .web-link a i {
            margin-right: 10px;
            color: var(--accent-light);
        }
        .site-footer {
            background-color: #0f172a;
            color: #cbd5e0;
            padding: 40px 0;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 25px;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            color: white;
        }
        .copyright {
            font-size: 0.95rem;
            opacity: 0.8;
            max-width: 800px;
            line-height: 1.6;
        }
        .footer-nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 25px;
            margin-top: 10px;
        }
        .footer-nav a {
            color: #94a3b8;
        }
        .footer-nav a:hover {
            color: white;
            text-decoration: underline;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .hero-title {
                font-size: 2.2rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .article-content, .rating-section, .comments-section {
                padding: 25px;
            }
            .main-content {
                gap: 25px;
            }
        }