* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Arial, sans-serif;
        }
        :root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #f39c12;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --gray: #95a5a6;
            --success: #27ae60;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: var(--primary);
            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 0;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--accent);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .nav-desktop {
            display: flex;
            gap: 30px;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: var(--light);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            padding: 5px 10px;
            border-radius: 4px;
        }
        .nav-desktop a:hover {
            background: var(--secondary);
            color: white;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: var(--dark);
            padding: 20px;
            gap: 15px;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: var(--light);
            text-decoration: none;
            padding: 10px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            transition: var(--transition);
        }
        .nav-mobile a:hover {
            color: var(--accent);
            padding-left: 15px;
        }
        .breadcrumb {
            background: var(--light);
            padding: 12px 0;
            font-size: 0.9rem;
            margin-bottom: 30px;
            border-radius: 0 0 8px 8px;
        }
        .breadcrumb a {
            color: var(--secondary);
            text-decoration: none;
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 8px;
        }
        .search-container {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 30px;
            text-align: center;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex: 1;
            padding: 12px 15px;
            border: 2px solid var(--gray);
            border-right: none;
            border-radius: 5px 0 0 5px;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .search-input:focus {
            border-color: var(--secondary);
        }
        .search-btn {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1rem;
        }
        .search-btn:hover {
            background: #c0392b;
        }
        main {
            padding: 30px 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 3px solid var(--accent);
        }
        h1 {
            color: var(--primary);
            font-size: 2.5rem;
            margin-bottom: 15px;
            line-height: 1.3;
        }
        .article-meta {
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content-section {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 30px;
        }
        h2 {
            color: var(--secondary);
            margin: 25px 0 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
            font-size: 1.8rem;
        }
        h3 {
            color: var(--primary);
            margin: 20px 0 12px;
            font-size: 1.4rem;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
            font-size: 1.05rem;
        }
        .highlight {
            background: #fff9e6;
            border-left: 4px solid var(--accent);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .highlight p {
            margin-bottom: 10px;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin: 25px 0;
        }
        .feature-card {
            background: var(--light);
            padding: 20px;
            border-radius: 8px;
            border-top: 4px solid var(--secondary);
        }
        .feature-card i {
            color: var(--secondary);
            font-size: 1.5rem;
            margin-bottom: 10px;
        }
        .image-container {
            margin: 30px 0;
            text-align: center;
        }
        .article-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: var(--shadow);
            border: 5px solid white;
        }
        figcaption {
            margin-top: 10px;
            color: var(--gray);
            font-style: italic;
            font-size: 0.9rem;
        }
        .download-box {
            background: linear-gradient(135deg, var(--primary) 0%, #34495e 100%);
            color: white;
            padding: 30px;
            border-radius: 10px;
            text-align: center;
            margin: 40px 0;
        }
        .download-btn {
            display: inline-block;
            background: var(--accent);
            color: white;
            padding: 15px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.2rem;
            margin-top: 20px;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(243, 156, 18, 0.3);
        }
        .download-btn:hover {
            background: #e67e22;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(243, 156, 18, 0.4);
        }
        .user-interaction {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        .rating-box, .comment-box {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .stars {
            display: flex;
            gap: 5px;
            margin: 15px 0;
            justify-content: center;
        }
        .star {
            color: var(--gray);
            cursor: pointer;
            font-size: 1.8rem;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: var(--accent);
        }
        .rating-form,
        .comment-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        textarea, input[type="text"], input[type="email"] {
            padding: 12px;
            border: 1px solid var(--gray);
            border-radius: 5px;
            font-size: 1rem;
            transition: var(--transition);
        }
        textarea:focus, input:focus {
            outline: none;
            border-color: var(--secondary);
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        .submit-btn {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 12px;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            font-size: 1rem;
            transition: var(--transition);
        }
        .submit-btn:hover {
            background: #c0392b;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin: 40px 0;
        }
        .web-link {
            background: white;
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .web-link a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            display: block;
        }
        .web-link a:hover {
            color: var(--secondary);
        }
        footer {
            background: var(--primary);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: var(--accent);
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-section a {
            color: var(--light);
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-section a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: var(--gray);
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .content-section {
                padding: 20px;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .search-form {
                flex-direction: column;
            }
            .search-input {
                border-right: 2px solid var(--gray);
                border-radius: 5px;
                margin-bottom: 10px;
            }
            .search-btn {
                border-radius: 5px;
                padding: 12px;
            }
            .user-interaction {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .content-section, .search-container, .user-interaction, .web-links {
            animation: fadeIn 0.8s ease-out;
        }
        @media print {
            .search-container, .user-interaction, .web-links, footer {
                display: none;
            }
            body {
                background: white;
            }
            .content-section {
                box-shadow: none;
                border: 1px solid #ddd;
            }
        }