* {
            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: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        .logo {
            font-size: 2rem;
            font-weight: bold;
            color: #ff6b35;
            text-decoration: none;
        }
        .logo span {
            color: #1a73e8;
        }
        .search-form {
            display: flex;
            gap: 10px;
        }
        .search-input {
            padding: 10px 15px;
            border: 2px solid #e0e0e0;
            border-radius: 25px;
            width: 300px;
            transition: all 0.3s ease;
        }
        .search-input:focus {
            outline: none;
            border-color: #ff6b35;
            box-shadow: 0 0 10px rgba(255, 107, 53, 0.3);
        }
        .search-btn {
            background: #ff6b35;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .search-btn:hover {
            background: #e55a2b;
            transform: translateY(-2px);
        }
        nav {
            background: #1a73e8;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            justify-content: center;
        }
        .nav-menu li {
            position: relative;
        }
        .nav-menu a {
            color: white;
            text-decoration: none;
            padding: 1rem 1.5rem;
            display: block;
            transition: all 0.3s ease;
        }
        .nav-menu a:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #ff6b35;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .breadcrumb {
            background: rgba(255, 255, 255, 0.9);
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
        }
        .breadcrumb a {
            color: #666;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: #ff6b35;
        }
        main {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            margin: 2rem auto;
            padding: 3rem;
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .article-header h1 {
            font-size: 2.5rem;
            color: #1a73e8;
            margin-bottom: 1rem;
        }
        .article-meta {
            color: #666;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .featured-image {
            width: 100%;
            height: 400px;
            background: linear-gradient(45deg, #667eea, #764ba2);
            border-radius: 10px;
            margin: 2rem 0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
        }
        .content-section {
            margin-bottom: 3rem;
        }
        .content-section h2 {
            color: #ff6b35;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #ff6b35;
        }
        .content-section h3 {
            color: #1a73e8;
            margin: 1.5rem 0 1rem 0;
        }
        .content-section p {
            margin-bottom: 1rem;
            text-align: justify;
        }
        .highlight {
            background: #fff3cd;
            padding: 1.5rem;
            border-left: 4px solid #ffc107;
            margin: 1.5rem 0;
            border-radius: 5px;
        }
        .download-box {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            margin: 2rem 0;
        }
        .download-btn {
            background: #ff6b35;
            color: white;
            padding: 15px 30px;
            border: none;
            border-radius: 25px;
            font-size: 1.2rem;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 1rem;
        }
        .download-btn:hover {
            background: #e55a2b;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 107, 53, 0.3);
        }
        .interactive-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        .grid-item {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }
        .grid-item:hover {
            transform: translateY(-5px);
            border-color: #ff6b35;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .grid-item i {
            font-size: 3rem;
            color: #ff6b35;
            margin-bottom: 1rem;
        }
        .comments-section {
            margin-top: 3rem;
        }
        .comment-form {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 10px;
            margin-bottom: 2rem;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: bold;
        }
        .form-control {
            width: 100%;
            padding: 10px;
            border: 2px solid #e0e0e0;
            border-radius: 5px;
            transition: all 0.3s ease;
        }
        .form-control:focus {
            outline: none;
            border-color: #ff6b35;
        }
        .rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 1.5rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s ease;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ffc107;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
        }
        .web-link {
            background: #f8f9fa;
            padding: 1rem;
            border-radius: 5px;
            text-align: center;
        }
        .web-link a {
            color: #1a73e8;
            text-decoration: none;
        }
        .web-link a:hover {
            color: #ff6b35;
        }
        footer {
            background: #2c3e50;
            color: white;
            text-align: center;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                gap: 1rem;
            }
            .search-input {
                width: 100%;
            }
            .hamburger {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #1a73e8;
            }
            .nav-menu.active {
                display: flex;
            }
            main {
                padding: 1.5rem;
                margin: 1rem;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .interactive-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 10px;
            }
            .article-header h1 {
                font-size: 1.5rem;
            }
            .featured-image {
                height: 250px;
                font-size: 1rem;
            }
            .download-btn {
                padding: 12px 24px;
                font-size: 1rem;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 3rem;
        }
        .mt-3 {
            margin-top: 3rem;
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 5px;
        }