:root {
            --primary: #0a3d62;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --gray: #7f8c8d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --border-radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f9f9f9;
            padding-top: 80px;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--primary);
            color: white;
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            text-transform: uppercase;
            letter-spacing: 2px;
        }
        .my-logo span {
            color: var(--secondary);
        }
        .my-logo:hover {
            color: var(--light);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
        }
        .nav-links li {
            margin-left: 25px;
        }
        .nav-links a {
            color: white;
            font-weight: 500;
            padding: 8px 5px;
            border-bottom: 2px solid transparent;
        }
        .nav-links a:hover {
            border-bottom-color: var(--secondary);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 12px 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--dark);
            margin: 0 5px;
        }
        .search-container {
            background: linear-gradient(135deg, var(--primary), #1a5276);
            padding: 40px 20px;
            text-align: center;
            color: white;
            margin-bottom: 30px;
        }
        .search-box {
            max-width: 600px;
            margin: 20px auto 0;
            display: flex;
        }
        .search-box input {
            flex: 1;
            padding: 15px 20px;
            border: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
            outline: none;
        }
        .search-box button {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .search-box button:hover {
            background-color: #c0392b;
        }
        main {
            background-color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 40px;
            margin-bottom: 40px;
        }
        article {
            max-width: 900px;
            margin: 0 auto;
        }
        h1, h2, h3, h4 {
            color: var(--primary);
            margin-top: 2rem;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 15px;
            margin-top: 0;
        }
        h2 {
            font-size: 2.2rem;
            padding-left: 10px;
            border-left: 5px solid var(--accent);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark);
        }
        h4 {
            font-size: 1.4rem;
            color: var(--gray);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--dark);
            background-color: #f0f8ff;
            padding: 20px;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--accent);
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fffde7;
            padding: 20px;
            border-radius: var(--border-radius);
            border: 1px dashed var(--secondary);
            margin: 25px 0;
        }
        .specs-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            box-shadow: var(--shadow);
            border-radius: var(--border-radius);
            overflow: hidden;
        }
        .specs-table th, .specs-table td {
            padding: 18px 15px;
            text-align: left;
            border-bottom: 1px solid #eee;
        }
        .specs-table th {
            background-color: var(--primary);
            color: white;
            font-weight: 600;
        }
        .specs-table tr:nth-child(even) {
            background-color: #f8f9fa;
        }
        .specs-table tr:hover {
            background-color: #e3f2fd;
        }
        .requirements-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 40px 0;
        }
        .req-card {
            background: linear-gradient(to bottom right, #f8f9fa, #e9ecef);
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            border-top: 5px solid var(--accent);
        }
        .req-card h3 {
            color: var(--primary);
            margin-top: 0;
        }
        .req-card ul {
            list-style-position: inside;
            margin: 15px 0;
        }
        .req-card li {
            margin-bottom: 10px;
        }
        .req-card .badge {
            display: inline-block;
            background-color: var(--secondary);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 15px;
        }
        .image-container {
            margin: 40px 0;
            text-align: center;
        }
        .featured-img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            transition: transform 0.5s ease;
        }
        .featured-img:hover {
            transform: scale(1.01);
        }
        .caption {
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        blockquote {
            border-left: 5px solid var(--secondary);
            padding-left: 25px;
            margin: 30px 0;
            font-style: italic;
            color: var(--dark);
            background-color: #fef5f5;
            padding: 25px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .rating-section, .comments-section {
            background-color: #f8f9fa;
            padding: 30px;
            border-radius: var(--border-radius);
            margin: 50px 0;
            border: 1px solid #e9ecef;
        }
        .rating-container {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            margin-top: 20px;
        }
        .stars {
            display: flex;
            gap: 5px;
            font-size: 2rem;
            color: #ffc107;
            cursor: pointer;
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        .rating-form, .comment-form {
            margin-top: 25px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .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(--accent);
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .btn {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #c0392b;
        }
        .related-links {
            background-color: #e8f4fc;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 40px 0;
        }
        .related-links h3 {
            margin-top: 0;
            color: var(--primary);
        }
        .link-list {
            list-style-type: none;
            column-count: 2;
            column-gap: 40px;
        }
        .link-list li {
            margin-bottom: 12px;
            break-inside: avoid;
        }
        .link-list a {
            display: block;
            padding: 10px 15px;
            background-color: white;
            border-radius: 6px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            transition: var(--transition);
        }
        .link-list a:hover {
            background-color: var(--accent);
            color: white;
            transform: translateX(5px);
        }
        footer {
            background-color: var(--dark);
            color: white;
            padding: 50px 0 20px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h4 {
            color: white;
            margin-top: 0;
            margin-bottom: 20px;
            font-size: 1.4rem;
            border-bottom: 2px solid var(--accent);
            padding-bottom: 10px;
            display: inline-block;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #ccc;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .friend-links {
            background-color: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: var(--border-radius);
            margin-top: 20px;
        }
        .friend-links h5 {
            font-size: 1.1rem;
            margin-bottom: 15px;
            color: #ffcc00;
        }
        .friend-links a {
            color: #aaa;
            display: inline-block;
            margin-right: 15px;
            margin-bottom: 10px;
        }
        .friend-links a:hover {
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        .update-time {
            background-color: #fff3cd;
            color: #856404;
            padding: 10px 20px;
            border-radius: var(--border-radius);
            display: inline-block;
            margin: 20px 0;
            font-weight: 600;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.9rem; }
            .link-list { column-count: 1; }
        }
        @media (max-width: 768px) {
            .header-container { padding: 15px; }
            .nav-links {
                display: none;
                position: absolute;
                top: 80px;
                left: 0;
                width: 100%;
                background-color: var(--primary);
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                margin: 10px 0;
            }
            .hamburger {
                display: block;
            }
            .search-box {
                flex-direction: column;
            }
            .search-box input {
                border-radius: var(--border-radius);
                margin-bottom: 10px;
            }
            .search-box button {
                border-radius: var(--border-radius);
                padding: 15px;
            }
            main {
                padding: 25px;
            }
            .requirements-container {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            body { padding-top: 70px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .lead { font-size: 1.1rem; }
            .footer-container {
                grid-template-columns: 1fr;
            }
        }
        @media print {
            header, nav, .search-container, .rating-section, .comments-section, .related-links, footer {
                display: none;
            }
            body {
                padding-top: 0;
                background: white;
                color: black;
            }
            main {
                box-shadow: none;
                padding: 0;
            }
        }