:root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #1a2530;
            --success: #27ae60;
            --warning: #f39c12;
            --text: #333;
            --text-light: #7f8c8d;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1280px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text);
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul, ol {
            list-style-position: inside;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-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 {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .logo span {
            background: linear-gradient(90deg, #fff 70%, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .desktop-nav ul {
            display: flex;
            gap: 2rem;
        }
        .desktop-nav a {
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .desktop-nav a:hover,
        .desktop-nav a:focus {
            background-color: rgba(255,255,255,0.15);
            color: var(--light);
            transform: translateY(-2px);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: var(--dark);
            padding: 1rem;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            padding: 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            transition: var(--transition);
        }
        .mobile-nav a:hover {
            background-color: var(--primary);
            padding-left: 1.5rem;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 1rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb .container {
            display: flex;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--accent);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--text-light);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-content h1 {
            color: var(--primary);
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 1rem;
        }
        .article-content h2 {
            color: var(--dark);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed var(--light);
        }
        .article-content h3 {
            color: var(--primary);
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .article-content .lead {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--primary);
            background-color: rgba(52, 152, 219, 0.08);
            padding: 1.5rem;
            border-left: 4px solid var(--accent);
            border-radius: 0 var(--radius) var(--radius) 0;
            margin-bottom: 2rem;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fdfcfb 0%, #f5f7fa 100%);
            border: 1px solid #e0e6ef;
            border-radius: var(--radius);
            padding: 1.8rem;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .highlight-box h4 {
            color: var(--secondary);
            font-size: 1.4rem;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-card {
            background: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
            border-top: 5px solid var(--accent);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.12);
        }
        .stat-card .number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--secondary);
            line-height: 1;
        }
        .stat-card .label {
            color: var(--text-light);
            font-size: 1rem;
            margin-top: 0.5rem;
        }
        .feature-img {
            width: 100%;
            border-radius: var(--radius);
            margin: 2rem auto;
            box-shadow: 0 6px 18px rgba(0,0,0,0.1);
            border: 3px solid white;
        }
        blockquote {
            font-style: italic;
            color: var(--text-light);
            border-left: 4px solid var(--warning);
            padding-left: 1.5rem;
            margin: 2rem 0;
            background-color: rgba(243, 156, 18, 0.05);
            padding: 1.5rem;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .author {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-top: 1rem;
        }
        .author-img {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--light);
        }
        .author-info h5 {
            color: var(--primary);
        }
        .author-info p {
            font-size: 0.9rem;
            margin-bottom: 0;
            color: var(--text-light);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--radius);
            padding: 1.8rem;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            color: var(--primary);
            font-size: 1.4rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light);
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex: 1;
            padding: 0.9rem 1rem;
            border: 1px solid #ddd;
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .search-form input:focus {
            border-color: var(--accent);
        }
        .search-form button {
            background-color: var(--accent);
            color: white;
            border: none;
            border-radius: 0 var(--radius) var(--radius) 0;
            padding: 0 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: #2980b9;
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            font-size: 1.8rem;
            color: #ffc107;
            margin: 1rem 0;
            cursor: pointer;
        }
        .stars span {
            transition: var(--transition);
        }
        .stars span:hover,
        .stars span:hover ~ span {
            color: #ff9800;
            transform: scale(1.1);
        }
        .rating-form input,
        .comment-form textarea,
        .comment-form input {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-family: inherit;
        }
        .rating-form button,
        .comment-form button {
            width: 100%;
            padding: 0.9rem;
            background-color: var(--success);
            color: white;
            border: none;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-form button:hover,
        .comment-form button:hover {
            background-color: #219653;
        }
        .comment-list {
            max-height: 400px;
            overflow-y: auto;
            padding-right: 0.5rem;
        }
        .comment-item {
            padding: 1rem 0;
            border-bottom: 1px solid #eee;
        }
        .comment-item:last-child {
            border-bottom: none;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }
        .comment-author {
            font-weight: 600;
            color: var(--primary);
        }
        .comment-date {
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .web-links {
            background: var(--primary);
            color: white;
            padding: 2.5rem 0;
            margin-top: 2rem;
        }
        .web-links .container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.2rem;
        }
        .web-link {
            background: rgba(255,255,255,0.08);
            padding: 1rem 1.2rem;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .web-link:hover {
            background: rgba(255,255,255,0.15);
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--light);
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .web-link i {
            color: var(--accent);
        }
        .site-footer {
            background-color: var(--dark);
            color: var(--light);
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 1rem;
            color: white;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 1.2rem;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.7rem;
        }
        .footer-links a {
            transition: var(--transition);
            color: #bdc3c7;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .article-content {
                padding: 1.8rem;
            }
            .article-content h1 {
                font-size: 2.2rem;
            }
            .article-content h2 {
                font-size: 1.7rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-container {
                grid-template-columns: 1fr;
            }
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3rem;
        }
        .keyword {
            background-color: rgba(231, 76, 60, 0.1);
            color: var(--secondary);
            font-weight: 600;
            padding: 0.1rem 0.4rem;
            border-radius: 4px;
        }
        .text-center {
            text-align: center;
        }
        .mt-2 { margin-top: 2rem; }
        .mb-2 { margin-bottom: 2rem; }