* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #0066b3;
            --secondary-color: #d20000;
            --accent-color: #ffcc00;
            --text-dark: #333333;
            --text-light: #666666;
            --bg-light: #f8f9fa;
            --bg-white: #ffffff;
            --border-color: #e0e0e0;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --border-radius: 8px;
            --container-width: 1200px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--bg-light);
            font-size: 16px;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        h1 {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            margin-top: 2.5rem;
            border-left: 4px solid var(--accent-color);
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.5rem;
            margin-top: 2rem;
            color: var(--secondary-color);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        strong {
            color: var(--secondary-color);
            font-weight: 700;
        }
        em {
            font-style: italic;
            color: var(--text-light);
        }
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            padding: 1rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--primary-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo span {
            color: var(--secondary-color);
        }
        .logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .logo i {
            color: var(--accent-color);
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f1f5f9;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "/";
            margin: 0 10px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
        }
        nav {
            background-color: var(--primary-color);
        }
        .nav-desktop {
            display: flex;
            justify-content: space-between;
        }
        .nav-desktop ul {
            display: flex;
            list-style: none;
        }
        .nav-desktop li {
            position: relative;
        }
        .nav-desktop a {
            color: white;
            padding: 1rem 1.5rem;
            display: block;
            font-weight: 600;
        }
        .nav-desktop a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            text-decoration: none;
        }
        .nav-desktop a i {
            margin-right: 8px;
        }
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 1rem;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: var(--primary-color);
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            z-index: 999;
            box-shadow: var(--shadow);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 1rem 1.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            display: block;
        }
        .nav-mobile a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            text-decoration: none;
        }
        .search-container {
            display: flex;
            margin: 2rem 0;
        }
        .search-input {
            flex-grow: 1;
            padding: 1rem;
            border: 2px solid var(--primary-color);
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
        }
        .search-button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0 2rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-button:hover {
            background-color: #005599;
        }
        main {
            padding: 2rem 0;
            background-color: var(--bg-white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 2rem 0;
        }
        .article-header {
            margin-bottom: 2rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        .article-meta {
            display: flex;
            gap: 2rem;
            color: var(--text-light);
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content-section {
            padding: 0 2rem;
        }
        .highlight-box {
            background-color: #f0f7ff;
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .feature-list {
            list-style-type: none;
            margin: 2rem 0;
        }
        .feature-list li {
            padding: 0.5rem 0;
            padding-left: 2rem;
            position: relative;
        }
        .feature-list li::before {
            content: "✓";
            position: absolute;
            left: 0;
            color: var(--secondary-color);
            font-weight: bold;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2rem auto;
            display: block;
            box-shadow: var(--shadow);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-light);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .download-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
        }
        .download-card {
            background-color: var(--bg-light);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            text-align: center;
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        .download-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .download-card i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .download-card h3 {
            margin-bottom: 1rem;
            font-size: 1.3rem;
        }
        .download-button {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            margin-top: 1rem;
            transition: var(--transition);
        }
        .download-button:hover {
            background-color: #b30000;
            text-decoration: none;
            transform: scale(1.05);
        }
        .rating-section {
            background-color: #fff9e6;
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            text-align: center;
        }
        .stars {
            margin: 1rem 0;
        }
        .stars i {
            font-size: 2rem;
            color: #ffcc00;
            cursor: pointer;
            margin: 0 5px;
            transition: var(--transition);
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        .comment-section {
            margin: 3rem 0;
        }
        .comment-form {
            background-color: var(--bg-light);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin-top: 2rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            font-size: 1rem;
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
        }
        .submit-button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .submit-button:hover {
            background-color: #005599;
        }
        footer {
            background-color: #1a1a1a;
            color: white;
            padding: 3rem 0 1.5rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cccccc;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #333;
        }
        .friend-link-title {
            color: var(--accent-color);
            margin-bottom: 1rem;
        }
        .friend-link-list {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .friend-link-list a {
            background-color: #333;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .friend-link-list a:hover {
            background-color: var(--primary-color);
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #333;
            color: #999;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.3rem; }
            .content-section {
                padding: 0 1rem;
            }
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .mobile-nav-toggle {
                display: block;
            }
            .header-top .container {
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            .download-links {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            .article-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
            .search-container {
                flex-direction: column;
            }
            .search-input {
                border-radius: var(--border-radius);
                margin-bottom: 0.5rem;
            }
            .search-button {
                border-radius: var(--border-radius);
                padding: 1rem;
            }
        }