* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #1a252f;
            --success: #27ae60;
            --warning: #f39c12;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            color: #333;
            line-height: 1.8;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--primary);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo span {
            color: var(--secondary);
            position: relative;
        }
        .logo span::after {
            content: '♠';
            position: absolute;
            top: -5px;
            right: -15px;
            font-size: 1.8rem;
            color: var(--accent);
        }
        .logo:hover {
            transform: scale(1.02);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-link {
            color: var(--light);
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-link:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
        }
        .nav-link.active {
            background-color: var(--secondary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: var(--dark);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav .nav-link {
            padding: 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background-color: white;
            padding: 1rem 0;
            margin-bottom: 2rem;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 10px;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            color: #999;
        }
        .breadcrumb a {
            color: #666;
        }
        .breadcrumb a:hover {
            color: var(--secondary);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }
        main {
            flex: 1;
            padding: 2rem 0;
        }
        .article-header {
            margin-bottom: 3rem;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            color: #666;
            font-size: 0.9rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }
        .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .content-section {
            background-color: white;
            border-radius: var(--radius);
            padding: 2.5rem;
            margin-bottom: 3rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .content-section:hover {
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
        }
        .section-title {
            color: var(--primary);
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 3px solid var(--secondary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title i {
            color: var(--accent);
        }
        .intro-text {
            font-size: 1.1rem;
            color: #444;
            margin-bottom: 2rem;
            line-height: 1.9;
        }
        .highlight-box {
            background: linear-gradient(to right, #f8f9fa, #e9f7fe);
            border-left: 5px solid var(--secondary);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .highlight-box h3 {
            color: var(--primary);
            margin-bottom: 0.8rem;
        }
        .image-container {
            margin: 2.5rem 0;
            text-align: center;
        }
        .article-image {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .interactive-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .feature-card {
            background: white;
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border-top: 5px solid var(--secondary);
        }
        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary);
            margin-bottom: 1.5rem;
            text-align: center;
        }
        .feature-card h3 {
            color: var(--primary);
            margin-bottom: 1rem;
            font-size: 1.4rem;
        }
        .feature-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .form-group label {
            font-weight: 600;
            color: #555;
        }
        .form-control {
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--secondary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            gap: 5px;
            margin: 0.5rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: var(--warning);
        }
        .star-rating input:checked ~ label {
            color: var(--warning);
        }
        .btn {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        .btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 4px 10px rgba(41, 128, 185, 0.3);
        }
        .btn-accent {
            background-color: var(--accent);
        }
        .btn-accent:hover {
            background-color: #c0392b;
            box-shadow: 0 4px 10px rgba(231, 76, 60, 0.3);
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: var(--radius);
            padding: 1.8rem;
            box-shadow: var(--shadow);
        }
        .widget-title {
            color: var(--primary);
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid #eee;
        }
        .statistics-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.2rem;
        }
        .stat-item {
            text-align: center;
            padding: 1rem;
            background: #f8f9fa;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: #e9f7fe;
            transform: scale(1.05);
        }
        .stat-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--secondary);
            line-height: 1;
        }
        .stat-label {
            font-size: 0.9rem;
            color: #666;
            margin-top: 0.5rem;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            box-shadow: 0 0 10px rgba(0,0,0,0.05);
        }
        .comparison-table th {
            background-color: var(--primary);
            color: white;
            padding: 1.2rem;
            text-align: left;
        }
        .comparison-table td {
            padding: 1rem 1.2rem;
            border-bottom: 1px solid #eee;
        }
        .comparison-table tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        .comparison-table tr:hover {
            background-color: #f0f7ff;
        }
        .footer-links {
            background-color: var(--light);
            padding: 3rem 0;
            margin-top: 3rem;
        }
        .links-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
        }
        .web-link {
            background: white;
            padding: 1.2rem;
            border-radius: var(--radius);
            box-shadow: 0 3px 8px rgba(0,0,0,0.08);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 15px rgba(0,0,0,0.1);
        }
        .web-link a {
            color: var(--primary);
            font-weight: 500;
            display: block;
            padding: 0.5rem 0;
        }
        .web-link a:hover {
            color: var(--accent);
            padding-left: 8px;
        }
        .site-footer {
            background-color: var(--dark);
            color: var(--light);
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .footer-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .copyright {
            font-size: 0.9rem;
            color: #bbb;
        }
        .social-links {
            display: flex;
            gap: 1.2rem;
        }
        .social-link {
            color: white;
            font-size: 1.3rem;
            transition: var(--transition);
        }
        .social-link:hover {
            color: var(--secondary);
            transform: translateY(-3px);
        }
        .text-center { text-align: center; }
        .text-bold { font-weight: 700; }
        .text-italic { font-style: italic; }
        .text-primary { color: var(--primary); }
        .text-secondary { color: var(--secondary); }
        .text-accent { color: var(--accent); }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mb-3 { margin-bottom: 3rem; }
        .mt-1 { margin-top: 1rem; }
        .mt-2 { margin-top: 2rem; }
        .mt-3 { margin-top: 3rem; }
        .py-1 { padding-top: 1rem; padding-bottom: 1rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .py-3 { padding-top: 3rem; padding-bottom: 3rem; }
        @media (max-width: 768px) {
            .article-header h1 {
                font-size: 2.2rem;
            }
            .content-section {
                padding: 1.5rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .interactive-features {
                grid-template-columns: 1fr;
            }
            .footer-info {
                flex-direction: column;
                text-align: center;
            }
        }
        @media print {
            .site-header, .breadcrumb, .interactive-features, 
            .sidebar, .footer-links, .site-footer, .btn {
                display: none;
            }
            body {
                background: white;
                color: black;
            }
            .content-section {
                box-shadow: none;
                border: 1px solid #ddd;
            }
        }