:root {
            --primary: #f99e1a; 
            --secondary: #1a73e8; 
            --dark: #0f1923;
            --light-dark: #1e2a35;
            --light: #f5f7fa;
            --text: #333;
            --text-light: #666;
            --border: #ddd;
            --success: #4caf50;
            --warning: #ff9800;
            --radius: 8px;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--light);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul, ol {
            padding-left: 1.5rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        section {
            padding: 40px 0;
        }
        header {
            background-color: var(--dark);
            color: white;
            position: sticky;
            top: 0;
            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: var(--primary);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: var(--secondary);
        }
        nav.desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        nav.desktop-nav a {
            color: white;
            font-weight: 500;
            padding: 5px 0;
            position: relative;
        }
        nav.desktop-nav a:hover {
            color: var(--primary);
        }
        nav.desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: var(--transition);
        }
        nav.desktop-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: var(--light-dark);
            padding: 20px;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav ul {
            list-style: none;
        }
        .mobile-nav li {
            margin-bottom: 15px;
        }
        .mobile-nav a {
            color: white;
            display: block;
            padding: 10px;
            border-left: 3px solid transparent;
        }
        .mobile-nav a:hover {
            border-left-color: var(--primary);
            background: rgba(255,255,255,0.05);
        }
        .breadcrumb {
            background: #f0f2f5;
            padding: 12px 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb span {
            color: var(--text-light);
            margin: 0 8px;
        }
        main {
            background: white;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 30px auto;
            overflow: hidden;
            max-width: 1100px;
        }
        .article-header {
            padding: 40px 30px 20px;
            border-bottom: 2px solid var(--primary);
        }
        .article-header h1 {
            font-size: 2.5rem;
            color: var(--dark);
            margin-bottom: 15px;
            line-height: 1.2;
        }
        .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            color: var(--text-light);
            font-size: 0.9rem;
            margin-top: 20px;
        }
        .meta i {
            margin-right: 5px;
        }
        .content {
            padding: 30px;
        }
        .content h2 {
            font-size: 1.8rem;
            color: var(--dark);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
        }
        .content h3 {
            font-size: 1.4rem;
            color: var(--light-dark);
            margin: 30px 0 15px;
        }
        .content h4 {
            font-size: 1.1rem;
            color: var(--text);
            margin: 25px 0 10px;
        }
        .content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .content strong {
            color: var(--dark);
            font-weight: 700;
        }
        .highlight-box {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            border-left: 5px solid var(--primary);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: white;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .stat-card i {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 10px;
        }
        .stat-card h3 {
            font-size: 1.5rem;
            margin: 10px 0;
        }
        .image-wrapper {
            margin: 30px 0;
            border-radius: var(--radius);
            overflow: hidden;
            position: relative;
        }
        .image-caption {
            background: var(--light-dark);
            color: white;
            padding: 10px;
            font-size: 0.9rem;
            text-align: center;
        }
        .link-list {
            background: #f9f9f9;
            padding: 20px;
            border-radius: var(--radius);
            margin: 30px 0;
        }
        .link-list h3 {
            margin-top: 0;
        }
        .link-list ul {
            columns: 2;
            list-style: none;
            padding-left: 0;
        }
        .link-list li {
            margin-bottom: 10px;
            padding-left: 1.5rem;
            position: relative;
        }
        .link-list li::before {
            content: '➤';
            color: var(--primary);
            position: absolute;
            left: 0;
        }
        .interactive-section {
            background: #f8f9fa;
            border-radius: var(--radius);
            padding: 30px;
            margin: 40px 0;
            border-top: 3px solid var(--secondary);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(249, 158, 26, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 12px 25px;
            border: none;
            border-radius: var(--radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background: #e08c17;
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: var(--secondary);
        }
        .btn-secondary:hover {
            background: #1557b7;
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 10px;
            margin: 15px 0;
        }
        .stars {
            display: flex;
            gap: 5px;
        }
        .star {
            color: #ddd;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: gold;
        }
        footer {
            background: var(--dark);
            color: #aaa;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #333;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #aaa;
        }
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: var(--light-dark);
            padding: 15px;
            margin: 10px 0;
            border-radius: var(--radius);
            border-left: 4px solid var(--primary);
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #777;
        }
        @media (max-width: 992px) {
            .content h1 { font-size: 2rem; }
            .content h2 { font-size: 1.6rem; }
            .link-list ul { columns: 1; }
        }
        @media (max-width: 768px) {
            .header-container { padding: 12px 15px; }
            .desktop-nav { display: none; }
            .hamburger { display: block; }
            .article-header { padding: 30px 20px 15px; }
            .content { padding: 20px; }
            .stats-grid { grid-template-columns: 1fr; }
            .interactive-section { padding: 20px; }
            .footer-content { grid-template-columns: 1fr; gap: 30px; }
        }
        @media (max-width: 480px) {
            .breadcrumb { font-size: 0.8rem; }
            .article-header h1 { font-size: 1.8rem; }
            .meta { flex-direction: column; gap: 10px; }
        }