:root {
            --primary: #4f46e5;
            --primary-dark: #4338ca;
            --secondary: #10b981;
            --accent: #f59e0b;
            --text: #1f2937;
            --text-light: #6b7280;
            --bg: #f9fafb;
            --card-bg: #ffffff;
            --border: #e5e7eb;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --radius: 12px;
            --transition: all 0.3s ease;
            --header-height: 80px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul, ol {
            list-style-position: inside;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--card-bg);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: var(--header-height);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 100%;
        }
        .logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--accent);
        }
        .logo span {
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .desktop-nav ul {
            display: flex;
            gap: 2rem;
        }
        .desktop-nav a {
            font-weight: 600;
            padding: 8px 16px;
            border-radius: var(--radius);
            position: relative;
        }
        .desktop-nav a:hover {
            color: var(--primary);
            background-color: rgba(79, 70, 229, 0.05);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            background: var(--primary);
            transition: var(--transition);
        }
        .desktop-nav a:hover::after {
            width: 80%;
        }
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--text);
            cursor: pointer;
        }
        .mobile-nav {
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background-color: var(--card-bg);
            box-shadow: var(--shadow);
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .mobile-nav.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .mobile-nav ul {
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .mobile-nav a {
            display: block;
            padding: 12px 20px;
            border-radius: var(--radius);
            font-weight: 600;
            border-left: 4px solid transparent;
        }
        .mobile-nav a:hover {
            background-color: rgba(79, 70, 229, 0.08);
            border-left-color: var(--primary);
        }
        .breadcrumb {
            padding: 1.5rem 0;
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        main {
            padding: 2rem 0 4rem;
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
            padding: 2rem;
            background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(16, 185, 129, 0.05));
            border-radius: var(--radius);
        }
        h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: var(--primary-dark);
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            color: var(--text-light);
            font-size: 0.95rem;
        }
        .article-meta i {
            margin-right: 6px;
            color: var(--primary);
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .interactive-card {
            background: var(--card-bg);
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .interactive-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 20px rgba(0, 0, 0, 0.12);
        }
        .interactive-card h3 {
            color: var(--primary);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interactive-card h3 i {
            font-size: 1.5rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text);
        }
        input, textarea, select {
            width: 100%;
            padding: 14px;
            border: 2px solid var(--border);
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
            font-family: inherit;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
        }
        button, .btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 14px 28px;
            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: 10px;
        }
        button:hover, .btn:hover {
            background-color: var(--primary-dark);
            transform: scale(1.03);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #0da271;
        }
        .rating {
            display: flex;
            gap: 6px;
            margin: 1rem 0;
        }
        .rating i {
            font-size: 1.8rem;
            color: #d1d5db;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating i:hover, .rating i.active {
            color: var(--accent);
        }
        .article-content {
            max-width: 900px;
            margin: 0 auto;
        }
        .content-section {
            margin-bottom: 3rem;
            padding: 2rem;
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-dark);
            margin-bottom: 1.5rem;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--accent);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--text);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background-color: rgba(245, 158, 11, 0.1);
            border-left: 4px solid var(--accent);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .highlight p {
            margin-bottom: 0;
        }
        .stat-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-item {
            text-align: center;
            padding: 2rem;
            background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-5px);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 10px;
        }
        .stat-label {
            font-size: 1.1rem;
            color: var(--text);
            font-weight: 600;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin: 2.5rem 0;
        }
        .feature-card {
            padding: 2rem;
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 2px solid var(--border);
            transition: var(--transition);
        }
        .feature-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        .image-container {
            margin: 2.5rem auto;
            text-align: center;
        }
        .article-image {
            border-radius: var(--radius);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            max-width: 800px;
            margin: 0 auto;
            border: 5px solid white;
        }
        .image-caption {
            margin-top: 1rem;
            font-style: italic;
            color: var(--text-light);
            font-size: 0.95rem;
        }
        .footer-links {
            background: linear-gradient(135deg, var(--primary-dark), #3730a3);
            padding: 3rem 0;
            color: white;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background: rgba(255, 255, 255, 0.1);
            padding: 1.2rem;
            border-radius: var(--radius);
            transition: var(--transition);
        }
        .web-link:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateX(8px);
        }
        .web-link a {
            color: white;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .web-link a:hover {
            color: #fbbf24;
        }
        footer {
            background-color: #111827;
            color: #d1d5db;
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        .copyright {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid #374151;
            width: 100%;
            font-size: 0.9rem;
            color: #9ca3af;
        }
        @media (max-width: 1024px) {
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                padding: 0 15px;
            }
            .desktop-nav {
                display: none;
            }
            .mobile-nav-toggle {
                display: block;
            }
            .article-header {
                padding: 1.5rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .content-section {
                padding: 1.5rem;
            }
            .interactive-section {
                grid-template-columns: 1fr;
            }
            .stat-box {
                grid-template-columns: 1fr;
            }
            .article-meta {
                flex-direction: column;
                align-items: center;
                gap: 0.8rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            h1 {
                font-size: 1.8rem;
            }
            .logo {
                font-size: 1.5rem;
            }
            button, .btn {
                padding: 12px 20px;
                width: 100%;
            }
            .interactive-card {
                padding: 1.5rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .text-bold {
            font-weight: 800;
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 4px;
        }
        .line-break {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border), transparent);
            margin: 2.5rem 0;
        }