:root {
            --primary: #1a237e;
            --primary-light: #534bae;
            --accent: #ff5722;
            --dark: #121212;
            --light: #f5f5f7;
            --gray: #757575;
            --transition: all 0.3s ease;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: var(--light);
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .top-bar {
            background-color: var(--dark);
            color: white;
            padding: 10px 0;
            font-size: 0.9rem;
        }
        .top-bar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .update-time {
            color: #aaa;
        }
        .header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-main {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
        }
        .logo span {
            color: var(--accent);
        }
        .logo i {
            margin-right: 10px;
            font-size: 2.2rem;
        }
        .search-box {
            display: flex;
            max-width: 400px;
            flex-grow: 1;
            margin: 0 30px;
        }
        .search-box input {
            flex-grow: 1;
            padding: 12px 20px;
            border: 2px solid #ddd;
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            outline: none;
        }
        .search-box input:focus {
            border-color: var(--primary);
        }
        .search-box button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            font-size: 1rem;
        }
        .search-box button:hover {
            background-color: var(--primary-light);
        }
        .nav-desktop {
            display: flex;
            gap: 25px;
        }
        .nav-desktop a {
            font-weight: 600;
            position: relative;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent);
            transition: var(--transition);
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary);
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: white;
            padding: 20px;
            box-shadow: inset 0 5px 10px rgba(0,0,0,0.05);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            font-weight: 600;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #f9f9f9;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb i {
            margin: 0 8px;
            font-size: 0.7rem;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background-color: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .article-content h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            color: var(--primary);
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 25px;
            margin-bottom: 25px;
            border-bottom: 1px solid #eee;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag {
            background-color: #e8eaf6;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--primary);
        }
        .tag:hover {
            background-color: var(--primary);
            color: white;
        }
        .featured-image {
            margin-bottom: 35px;
            position: relative;
        }
        .featured-image img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.9rem;
        }
        .article-body h2 {
            font-size: 2rem;
            margin: 40px 0 20px;
            color: var(--primary);
            padding-bottom: 10px;
            border-bottom: 2px solid #e8eaf6;
        }
        .article-body h3 {
            font-size: 1.6rem;
            margin: 30px 0 15px;
            color: var(--dark);
        }
        .article-body h4 {
            font-size: 1.3rem;
            margin: 25px 0 12px;
            color: var(--gray);
        }
        .article-body p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .article-body em {
            color: var(--accent);
            font-style: normal;
            font-weight: 600;
        }
        .article-body strong {
            color: var(--primary);
        }
        .highlight-box {
            background-color: #f0f7ff;
            border-left: 5px solid var(--accent);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: white;
            padding: 25px;
            border-radius: var(--border-radius);
            text-align: center;
        }
        .stat-card .number {
            font-size: 2.5rem;
            font-weight: 800;
            display: block;
            line-height: 1;
        }
        .link-list {
            background-color: #f9f9f9;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
        }
        .link-list ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
        }
        .link-list a {
            display: flex;
            align-items: center;
            padding: 10px;
            border-radius: 5px;
        }
        .link-list a:hover {
            background-color: white;
            color: var(--accent);
        }
        .link-list i {
            margin-right: 10px;
            color: var(--primary);
        }
        .interactive-section {
            background-color: white;
            border: 2px dashed #ddd;
            border-radius: var(--border-radius);
            padding: 30px;
            margin: 40px 0;
            text-align: center;
        }
        .interactive-section h3 {
            margin-top: 0;
        }
        .rating {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin: 20px 0;
            font-size: 1.8rem;
            color: #ffc107;
        }
        .rating i {
            cursor: pointer;
            transition: var(--transition);
        }
        .rating i:hover {
            transform: scale(1.2);
        }
        .form-group {
            margin-bottom: 20px;
            text-align: left;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(26, 35, 126, 0.1);
        }
        .btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--primary-light);
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(26, 35, 126, 0.2);
        }
        .btn-accent {
            background-color: var(--accent);
        }
        .btn-accent:hover {
            background-color: #e64a19;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--primary);
            padding-bottom: 10px;
            border-bottom: 2px solid #e8eaf6;
        }
        .related-links ul {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 12px;
        }
        .related-links a {
            display: block;
            padding: 10px 15px;
            background-color: #f5f5f5;
            border-radius: 5px;
        }
        .related-links a:hover {
            background-color: #e8eaf6;
            padding-left: 20px;
        }
        .popular-articles .article-item {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        .popular-articles .article-item:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        .article-item img {
            width: 70px;
            height: 70px;
            object-fit: cover;
            margin-right: 15px;
            border-radius: 5px;
        }
        .article-item h4 {
            font-size: 1rem;
            margin: 0;
        }
        .footer {
            background-color: var(--dark);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-main {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 15px;
        }
        .footer-logo span {
            color: var(--accent);
        }
        .footer-description {
            color: #aaa;
            margin-bottom: 20px;
        }
        .social-links {
            display: flex;
            gap: 15px;
        }
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: #333;
            border-radius: 50%;
            color: white;
        }
        .social-links a:hover {
            background-color: var(--accent);
            transform: translateY(-5px);
        }
        .footer-links h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: white;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #aaa;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: #222;
            padding: 30px;
            border-radius: var(--border-radius);
            margin-bottom: 30px;
        }
        friend-link h3 {
            color: white;
            margin-bottom: 20px;
            text-align: center;
        }
        .friend-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
        }
        .friend-links a {
            background-color: #333;
            color: white;
            padding: 10px 20px;
            border-radius: 30px;
        }
        .friend-links a:hover {
            background-color: var(--accent);
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #333;
            color: #777;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-main {
                flex-wrap: wrap;
            }
            .search-box {
                order: 3;
                width: 100%;
                margin: 15px 0 0;
                max-width: 100%;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-content {
                padding: 25px;
            }
            .article-content h1 {
                font-size: 2.2rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .link-list ul {
                grid-template-columns: 1fr;
            }
        }