* { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #2c3e50;
            --text-color: #333;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--text-color);
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        a { color: var(--secondary-color); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent-color); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5rem; margin: 1rem 0; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i { color: var(--accent-color); }
        .my-logo:hover { color: var(--light-color); transform: scale(1.02); }
        .main-nav { display: flex; align-items: center; }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-links a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: var(--border-radius);
        }
        .nav-links a:hover { background-color: rgba(255,255,255,0.1); }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--light-color);
            padding: 0.8rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after { content: '›'; margin-left: 0.5rem; }
        .breadcrumb a { color: var(--dark-color); }
        .breadcrumb a:hover { text-decoration: underline; }
        main { padding: 2rem 0; }
        .article-header { text-align: center; margin-bottom: 2.5rem; }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            color: #666;
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }
        .article-meta i { margin-right: 0.3rem; }
        .featured-image {
            margin: 2.5rem auto;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 900px;
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 0.8rem;
            background-color: #eee;
            color: #555;
        }
        .article-content {
            font-size: 1.1rem;
            max-width: 900px;
            margin: 0 auto;
        }
        .article-content h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--secondary-color);
        }
        .article-content h3 {
            font-size: 1.8rem;
            color: var(--dark-color);
            margin: 2rem 0 1rem;
        }
        .article-content h4 {
            font-size: 1.5rem;
            color: #555;
            margin: 1.5rem 0 0.8rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-content strong { color: var(--accent-color); font-weight: 700; }
        .article-content em { color: var(--secondary-color); font-style: italic; }
        .article-content blockquote {
            border-left: 4px solid var(--accent-color);
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            background-color: #f8f9fa;
            padding: 1.5rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .related-links {
            background-color: #e8f4fc;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        .related-links h3 { margin-top: 0; }
        .related-links ul { list-style: none; padding-left: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1rem; }
        .related-links li { background: white; padding: 1rem; border-radius: var(--border-radius); }
        .related-links a { font-weight: 600; display: block; }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .interactive-box {
            background-color: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .interactive-box h3 { margin-top: 0; }
        .form-group { margin-bottom: 1.2rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        .form-control {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus { outline: none; border-color: var(--secondary-color); box-shadow: 0 0 0 3px rgba(52,152,219,0.2); }
        .btn {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover { background-color: #2980b9; transform: translateY(-2px); }
        .btn-accent { background-color: var(--accent-color); }
        .btn-accent:hover { background-color: #c0392b; }
        .rating-stars { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
        .rating-stars input { display: none; }
        .rating-stars label { font-size: 1.8rem; color: #ddd; cursor: pointer; }
        .rating-stars input:checked ~ label { color: #ddd; }
        .rating-stars label:hover,
        .rating-stars label:hover ~ label { color: #ffcc00; }
        .rating-stars input:checked + label,
        .rating-stars input:checked + label ~ label { color: #ffcc00; }
        .site-footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 { font-size: 1.5rem; margin-bottom: 1.2rem; color: var(--light-color); }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #ccc; }
        .footer-links a:hover { color: white; padding-left: 0.5rem; }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: var(--border-radius);
            margin-bottom: 1rem;
        }
        friend-link a { color: #3498db; font-weight: 600; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--primary-color);
                padding: 1rem;
                box-shadow: var(--shadow);
            }
            .nav-links.active { display: flex; }
            .article-header h1 { font-size: 2.2rem; }
            .article-content h2 { font-size: 1.9rem; }
            .article-content h3 { font-size: 1.6rem; }
            .interactive-section { grid-template-columns: 1fr; }
            .header-content, .breadcrumb ol { padding: 0 15px; }
        }
        @media print {
            .site-header, .breadcrumb, .interactive-section, .site-footer { display: none; }
            body { font-size: 12pt; color: black; }
            .article-content { max-width: 100%; }
        }