* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #8B5CF6;
            --secondary-color: #10B981;
            --accent-color: #F59E0B;
            --dark-color: #1F2937;
            --light-color: #F9FAFB;
            --text-color: #374151;
            --gray-light: #E5E7EB;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--light-color);
            max-width: 100%;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            color: var(--dark-color);
            line-height: 1.3;
            margin-bottom: 1rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        h2 {
            font-size: 2rem;
            border-left: 4px solid var(--secondary-color);
            padding-left: 1rem;
            margin-top: 3rem;
            margin-bottom: 1.5rem;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--dark-color);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 1.5rem;
        }
        .logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .logo i {
            color: var(--secondary-color);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 600;
            transition: var(--transition);
            padding: 0.5rem 1rem;
            border-radius: 0.5rem;
        }
        .nav-desktop a:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .nav-mobile-toggle {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--dark-color);
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: white;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            padding: 1rem;
            text-decoration: none;
            color: var(--dark-color);
            border-bottom: 1px solid var(--gray-light);
        }
        .breadcrumb {
            background-color: var(--gray-light);
            padding: 1rem 1.5rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .breadcrumb span {
            color: var(--text-color);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background-color: white;
            padding: 2rem;
            border-radius: 1rem;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background-color: white;
            padding: 2rem;
            border-radius: 1rem;
            box-shadow: var(--shadow);
            height: fit-content;
        }
        .feature-card {
            background: linear-gradient(135deg, #8B5CF6, #10B981);
            color: white;
            padding: 1.5rem;
            border-radius: 1rem;
            margin-bottom: 2rem;
            text-align: center;
        }
        .feature-card h3 {
            color: white;
        }
        .download-section {
            background-color: var(--light-color);
            padding: 2rem;
            border-radius: 1rem;
            margin: 2rem 0;
            text-align: center;
            border: 2px dashed var(--primary-color);
        }
        .download-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 2rem;
            border-radius: 0.5rem;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.2rem;
            transition: var(--transition);
            margin: 1rem 0;
        }
        .download-btn:hover {
            background-color: #7C3AED;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(139, 92, 246, 0.3);
        }
        .interactive-box {
            background-color: var(--light-color);
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 0.5rem 0.5rem 0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-control {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--gray-light);
            border-radius: 0.5rem;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
        }
        .btn {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 0.5rem;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: #7C3AED;
        }
        .btn-secondary {
            background-color: var(--secondary-color);
        }
        .btn-secondary:hover {
            background-color: #0EA271;
        }
        .rating-system {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            color: var(--gray-light);
            cursor: pointer;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: var(--accent-color);
        }
        .comment {
            background-color: var(--light-color);
            padding: 1rem;
            border-radius: 0.5rem;
            margin-bottom: 1rem;
            border-left: 3px solid var(--primary-color);
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
        }
        .data-table th,
        .data-table td {
            padding: 1rem;
            text-align: left;
            border-bottom: 1px solid var(--gray-light);
        }
        .data-table th {
            background-color: var(--primary-color);
            color: white;
        }
        .data-table tr:hover {
            background-color: var(--light-color);
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 0.5rem;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-color);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .highlight {
            background-color: rgba(139, 92, 246, 0.1);
            padding: 0.2rem 0.5rem;
            border-radius: 0.25rem;
            font-weight: 600;
        }
        .key-point {
            background: linear-gradient(90deg, rgba(139, 92, 246, 0.1), transparent);
            padding: 1.5rem;
            border-left: 4px solid var(--primary-color);
            margin: 1.5rem 0;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin: 3rem 0;
        }
        .web-link {
            background-color: var(--light-color);
            padding: 1rem;
            border-radius: 0.5rem;
            text-align: center;
        }
        .web-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
        }
        .web-link a:hover {
            text-decoration: underline;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 1.5rem;
        }
        .footer-section a {
            color: var(--gray-light);
            text-decoration: none;
            display: block;
            margin-bottom: 0.5rem;
            transition: var(--transition);
        }
        .footer-section a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: var(--gray-light);
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.75rem;
            }
            .nav-desktop {
                display: none;
            }
            .nav-mobile-toggle {
                display: block;
            }
            .header-container {
                padding: 1rem;
            }
            .article-content,
            .sidebar {
                padding: 1.5rem;
            }
            .main-content {
                padding: 1rem 0;
            }
            .download-btn {
                padding: 0.75rem 1.5rem;
                font-size: 1rem;
            }
            .data-table {
                display: block;
                overflow-x: auto;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 1rem;
            }
            h1 {
                font-size: 1.75rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .feature-card {
                padding: 1rem;
            }
            .web-links {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        @media print {
            .header, .sidebar, .footer, .download-section, .interactive-box {
                display: none;
            }
            .main-content {
                grid-template-columns: 1fr;
                gap: 0;
            }
            body {
                background-color: white;
                color: black;
            }
        }