* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a5276;
            --secondary-color: #e74c3c;
            --accent-color: #f39c12;
            --text-color: #2c3e50;
            --light-bg: #ecf0f1;
            --white: #ffffff;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--light-bg);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        header {
            background-color: var(--primary-color);
            color: var(--white);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            text-decoration: none;
            color: var(--white);
            display: flex;
            align-items: center;
        }
        .logo i {
            margin-right: 10px;
            color: var(--accent-color);
        }
        .search-form {
            display: flex;
            width: 100%;
            max-width: 400px;
        }
        .search-input {
            flex: 1;
            padding: 10px 15px;
            border: none;
            border-radius: 4px 0 0 4px;
            font-size: 1rem;
        }
        .search-btn {
            background-color: var(--accent-color);
            color: var(--white);
            border: none;
            padding: 10px 15px;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background-color: #e67e22;
        }
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--white);
            font-size: 1.5rem;
            cursor: pointer;
        }
        nav {
            background-color: rgba(0, 0, 0, 0.1);
        }
        .nav-links {
            display: flex;
            list-style: none;
        }
        .nav-links li {
            position: relative;
        }
        .nav-links a {
            display: block;
            padding: 15px 20px;
            color: var(--white);
            text-decoration: none;
            transition: var(--transition);
        }
        .nav-links a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            padding: 10px 0;
            background-color: rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--white);
            text-decoration: none;
        }
        .breadcrumb span {
            margin: 0 5px;
        }
        main {
            padding: 30px 0;
            background-color: var(--white);
        }
        .article-header {
            margin-bottom: 30px;
            text-align: center;
            padding: 20px;
            background: linear-gradient(135deg, var(--primary-color), #2980b9);
            color: var(--white);
            border-radius: 8px;
        }
        .article-header h1 {
            font-size: 2.5rem;
            margin-bottom: 15px;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            font-size: 0.9rem;
            opacity: 0.9;
        }
        .content-section {
            margin-bottom: 40px;
        }
        h2 {
            color: var(--primary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-color);
        }
        h3 {
            color: var(--secondary-color);
            margin: 25px 0 15px;
        }
        p {
            margin-bottom: 15px;
            text-align: justify;
        }
        .highlight {
            background-color: #fff9e6;
            padding: 15px;
            border-left: 4px solid var(--accent-color);
            margin: 20px 0;
            border-radius: 0 4px 4px 0;
        }
        .feature-img {
            width: 100%;
            max-width: 800px;
            margin: 20px auto;
            display: block;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background-color: var(--light-bg);
            padding: 20px;
            border-radius: 8px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        .stat-card h3 {
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .tips-list {
            list-style: none;
            margin: 20px 0;
        }
        .tips-list li {
            padding: 10px 0;
            border-bottom: 1px solid #eee;
            display: flex;
            align-items: flex-start;
        }
        .tips-list li:before {
            content: "✓";
            color: var(--accent-color);
            font-weight: bold;
            margin-right: 10px;
        }
        .interactive-section {
            background-color: var(--light-bg);
            padding: 30px;
            border-radius: 8px;
            margin: 40px 0;
        }
        .rating-system {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin: 20px 0;
        }
        .stars {
            display: flex;
            margin-bottom: 15px;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
            margin: 0 5px;
        }
        .star:hover, .star.active {
            color: var(--accent-color);
        }
        .comment-form, .rating-form {
            width: 100%;
            max-width: 600px;
            margin: 0 auto;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 2px rgba(26, 82, 118, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .submit-btn {
            background-color: var(--primary-color);
            color: var(--white);
            border: none;
            padding: 12px 25px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 1rem;
            transition: var(--transition);
        }
        .submit-btn:hover {
            background-color: #154360;
        }
        .internal-links {
            background-color: var(--primary-color);
            padding: 30px 0;
            color: var(--white);
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 15px;
        }
        .web-link {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 15px;
            border-radius: 4px;
            transition: var(--transition);
        }
        .web-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--white);
            text-decoration: none;
            display: block;
        }
        footer {
            background-color: #1a252f;
            color: var(--white);
            padding: 30px 0;
            text-align: center;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .copyright {
            margin-top: 20px;
            font-size: 0.9rem;
            opacity: 0.8;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .logo {
                font-size: 1.5rem;
            }
            .search-form {
                order: 3;
                margin-top: 15px;
                max-width: 100%;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
            }
            .nav-links.active {
                display: flex;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .web-links {
                grid-template-columns: 1fr;
            }
        }