* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: #4a5568;
            text-decoration: none;
        }
        .logo:hover {
            color: #667eea;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            text-decoration: none;
            color: #4a5568;
            font-weight: 500;
            transition: color 0.3s ease;
        }
        .nav-desktop a:hover {
            color: #667eea;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: #4a5568;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            gap: 1rem;
            padding: 1rem 0;
            background: white;
        }
        .nav-mobile.active {
            display: flex;
        }
        .breadcrumb {
            background: rgba(255, 255, 255, 0.9);
            padding: 1rem 0;
            margin-top: 80px;
        }
        .breadcrumb-content {
            display: flex;
            gap: 0.5rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #667eea;
            text-decoration: none;
        }
        .search-section {
            background: white;
            padding: 3rem 0;
            text-align: center;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            gap: 1rem;
        }
        .search-input {
            flex: 1;
            padding: 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
        }
        .search-btn {
            padding: 1rem 2rem;
            background: #667eea;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s ease;
        }
        .search-btn:hover {
            background: #5a67d8;
        }
        .main-content {
            background: white;
            padding: 3rem 0;
            margin: 2rem auto;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .article-header h1 {
            font-size: 2.5rem;
            color: #2d3748;
            margin-bottom: 1rem;
        }
        .article-meta {
            color: #718096;
            font-size: 0.9rem;
        }
        .content-section {
            margin-bottom: 3rem;
        }
        .content-section h2 {
            color: #4a5568;
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
            border-left: 4px solid #667eea;
            padding-left: 1rem;
        }
        .content-section h3 {
            color: #4a5568;
            margin: 1.5rem 0 1rem 0;
            font-size: 1.4rem;
        }
        .content-section p {
            margin-bottom: 1rem;
            text-align: justify;
            line-height: 1.8;
        }
        .highlight {
            background: linear-gradient(120deg, #a0c4ff 0%, #ffd6ff 100%);
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
            border-left: 5px solid #667eea;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        .feature-card {
            background: #f7fafc;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: #667eea;
            margin-bottom: 1rem;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .interactive-section {
            background: #f8f9fa;
            padding: 3rem;
            border-radius: 15px;
            margin: 3rem 0;
        }
        .rating-system {
            text-align: center;
            margin: 2rem 0;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 2rem;
            color: #e2e8f0;
            cursor: pointer;
            transition: color 0.3s ease;
        }
        .star:hover,
        .star.active {
            color: #f6ad55;
        }
        .comment-form {
            max-width: 600px;
            margin: 0 auto;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            color: #4a5568;
            font-weight: 500;
        }
        .form-control {
            width: 100%;
            padding: 1rem;
            border: 2px solid #e2e8f0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }
        .form-control:focus {
            outline: none;
            border-color: #667eea;
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .submit-btn {
            background: #667eea;
            color: white;
            padding: 1rem 2rem;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s ease;
        }
        .submit-btn:hover {
            background: #5a67d8;
        }
        .footer-links {
            background: #2d3748;
            padding: 3rem 0;
            color: white;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin-bottom: 2rem;
        }
        .web-link {
            background: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: 8px;
            transition: background 0.3s ease;
        }
        .web-link:hover {
            background: rgba(255,255,255,0.2);
        }
        .web-link a {
            color: #a0aec0;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .web-link a:hover {
            color: white;
        }
        footer {
            background: #1a202c;
            color: #a0aec0;
            text-align: center;
            padding: 2rem 0;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .header-content {
                padding: 1rem 0;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .search-form {
                flex-direction: column;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .interactive-section {
                padding: 2rem 1rem;
            }
            .stars {
                gap: 0.3rem;
            }
            .star {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
            .content-section h2 {
                font-size: 1.5rem;
            }
            .content-section h3 {
                font-size: 1.2rem;
            }
            .highlight {
                padding: 1.5rem;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        @media print {
            .interactive-section,
            .search-section,
            .footer-links {
                display: none;
            }
        }