* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --gray: #95a5a6;
            --success: #27ae60;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: 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: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .logo span {
            color: var(--secondary);
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .desktop-nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .desktop-nav a:hover {
            background-color: rgba(255,255,255,0.1);
            color: var(--accent);
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: var(--dark);
            padding: 20px;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav ul {
            list-style: none;
        }
        .mobile-nav li {
            margin-bottom: 15px;
        }
        .mobile-nav a {
            color: white;
            text-decoration: none;
            font-size: 1.1rem;
            display: block;
            padding: 10px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .mobile-nav a:hover {
            background-color: rgba(255,255,255,0.1);
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--gray);
        }
        main {
            padding: 40px 0;
            background-color: white;
        }
        article {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 20px;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--accent);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--dark);
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--dark);
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            color: var(--dark);
            font-weight: 500;
            margin-bottom: 30px;
            padding-left: 20px;
            border-left: 4px solid var(--accent);
        }
        .highlight {
            background-color: rgba(52, 152, 219, 0.1);
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            border-left: 5px solid var(--accent);
        }
        .term {
            font-weight: bold;
            color: var(--secondary);
        }
        .tip {
            background-color: rgba(39, 174, 96, 0.1);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            border-left: 5px solid var(--success);
        }
        .tip h4 {
            color: var(--success);
            margin-top: 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            margin: 30px auto;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .article-image img:hover {
            transform: scale(1.02);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.9rem;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 25px;
        }
        li {
            margin-bottom: 10px;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 25px 0;
            box-shadow: var(--shadow);
            border-radius: var(--border-radius);
            overflow: hidden;
        }
        th {
            background-color: var(--primary);
            color: white;
            padding: 15px;
            text-align: left;
        }
        td {
            padding: 15px;
            border-bottom: 1px solid #eee;
        }
        tr:nth-child(even) {
            background-color: #f8f9fa;
        }
        tr:hover {
            background-color: rgba(52, 152, 219, 0.1);
        }
        .interactive-section {
            background-color: #f8f9fa;
            padding: 40px;
            border-radius: var(--border-radius);
            margin: 50px 0;
            text-align: center;
            box-shadow: var(--shadow);
        }
        .interactive-section h3 {
            margin-top: 0;
            color: var(--primary);
        }
        .search-form {
            display: flex;
            max-width: 500px;
            margin: 20px auto;
        }
        .search-form input {
            flex: 1;
            padding: 15px;
            border: 2px solid var(--accent);
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1.1rem;
        }
        .search-form button:hover {
            background-color: #2980b9;
        }
        .rating-system {
            margin: 30px 0;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin: 15px 0;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #f39c12;
        }
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
            max-width: 500px;
            margin: 0 auto;
        }
        .rating-form textarea {
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            resize: vertical;
            min-height: 100px;
        }
        .rating-form button {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 15px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .rating-form button:hover {
            background-color: #c0392b;
        }
        .comments-section {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 2px solid #eee;
        }
        .comment-form {
            background-color: #f8f9fa;
            padding: 25px;
            border-radius: var(--border-radius);
            margin-bottom: 30px;
        }
        .comment-form h4 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
        }
        .comment {
            padding: 20px;
            border-bottom: 1px solid #eee;
            margin-bottom: 20px;
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .comment-author {
            font-weight: bold;
            color: var(--primary);
        }
        .footer-links {
            background-color: var(--light);
            padding: 40px 0;
        }
        .web-link {
            margin-bottom: 15px;
        }
        .web-link a {
            color: var(--primary);
            text-decoration: none;
            font-size: 1.1rem;
            transition: var(--transition);
            display: inline-block;
            padding: 5px 0;
        }
        .web-link a:hover {
            color: var(--accent);
            transform: translateX(5px);
        }
        .web-link a::before {
            content: "•";
            color: var(--accent);
            margin-right: 10px;
        }
        footer {
            background-color: var(--primary);
            color: white;
            padding: 40px 0 20px;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .copyright {
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            width: 100%;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
        }
        @media (max-width: 992px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .interactive-section {
                padding: 30px 20px;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .desktop-nav {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .article-image {
                margin: 20px -20px;
                border-radius: 0;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form input {
                border-radius: var(--border-radius);
                margin-bottom: 10px;
            }
            .search-form button {
                border-radius: var(--border-radius);
                padding: 15px;
            }
            table {
                display: block;
                overflow-x: auto;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            article {
                padding: 0 15px;
            }
            h1 {
                font-size: 1.7rem;
            }
            .lead {
                font-size: 1.1rem;
            }
            .highlight, .tip {
                padding: 20px 15px;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.8s ease forwards;
        }