* {
            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-color: #f8f9fa;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        .logo {
            font-size: 2rem;
            font-weight: bold;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: #ffd700;
        }
        .search-form {
            display: flex;
            gap: 10px;
        }
        .search-form input {
            padding: 10px;
            border: none;
            border-radius: 5px;
            width: 300px;
        }
        .search-form button {
            padding: 10px 20px;
            background: #ff6b6b;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: #ff5252;
        }
        nav {
            background: #2c3e50;
            padding: 1rem 0;
        }
        .nav-desktop {
            display: flex;
            justify-content: center;
            gap: 2rem;
            list-style: none;
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            padding: 10px 20px;
            border-radius: 5px;
            transition: background 0.3s;
        }
        .nav-desktop a:hover {
            background: #34495e;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #2c3e50;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            z-index: 1000;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            text-decoration: none;
            padding: 15px 20px;
            border-bottom: 1px solid #34495e;
            transition: background 0.3s;
        }
        .nav-mobile a:hover {
            background: #34495e;
        }
        .breadcrumb {
            background: #ecf0f1;
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
        }
        .breadcrumb a {
            color: #3498db;
            text-decoration: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 10px;
            color: #7f8c8d;
        }
        main {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 2rem;
            margin: 2rem 0;
        }
        .article-content {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .article-content h1 {
            color: #2c3e50;
            margin-bottom: 1.5rem;
            font-size: 2.5rem;
            line-height: 1.2;
        }
        .article-content h2 {
            color: #34495e;
            margin: 2rem 0 1rem 0;
            font-size: 1.8rem;
            border-left: 4px solid #3498db;
            padding-left: 15px;
        }
        .article-content h3 {
            color: #2c3e50;
            margin: 1.5rem 0 1rem 0;
            font-size: 1.4rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .article-content strong {
            color: #e74c3c;
            font-weight: 600;
        }
        .featured-image {
            width: 100%;
            height: 400px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 10px;
            margin: 2rem 0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
        }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .rating-widget, .comments-widget {
            margin-bottom: 2rem;
        }
        .rating-widget h3, .comments-widget h3 {
            color: #2c3e50;
            margin-bottom: 1rem;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin-bottom: 1rem;
        }
        .star {
            color: #f39c12;
            cursor: pointer;
            font-size: 1.5rem;
            transition: transform 0.2s;
        }
        .star:hover {
            transform: scale(1.2);
        }
        .comment-form textarea {
            width: 100%;
            padding: 15px;
            border: 1px solid #bdc3c7;
            border-radius: 5px;
            margin-bottom: 1rem;
            resize: vertical;
            min-height: 100px;
        }
        .comment-form button {
            background: #27ae60;
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .comment-form button:hover {
            background: #219a52;
        }
        .web-links {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 2rem 0;
        }
        .web-links h2 {
            color: #2c3e50;
            margin-bottom: 1.5rem;
        }
        .web-link-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: #ecf0f1;
            padding: 15px;
            border-radius: 5px;
            transition: transform 0.3s, background 0.3s;
        }
        .web-link:hover {
            transform: translateY(-2px);
            background: #d5dbdb;
        }
        .web-link a {
            color: #3498db;
            text-decoration: none;
            font-weight: 500;
        }
        footer {
            background: #2c3e50;
            color: white;
            padding: 3rem 0 1rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            margin-bottom: 1rem;
            color: #ecf0f1;
        }
        .footer-section a {
            color: #bdc3c7;
            text-decoration: none;
            display: block;
            margin-bottom: 0.5rem;
            transition: color 0.3s;
        }
        .footer-section a:hover {
            color: #3498db;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #34495e;
            color: #bdc3c7;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                gap: 1rem;
            }
            .search-form input {
                width: 100%;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            main {
                grid-template-columns: 1fr;
            }
            .article-content h1 {
                font-size: 2rem;
            }
            .featured-image {
                height: 250px;
                font-size: 1.2rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 10px;
            }
            .article-content {
                padding: 1rem;
            }
            .sidebar {
                padding: 1rem;
            }
            .article-content h1 {
                font-size: 1.8rem;
            }
            .article-content h2 {
                font-size: 1.5rem;
            }
        }
        .download-btn {
            display: inline-block;
            background: linear-gradient(135deg, #27ae60, #2ecc71);
            color: white;
            padding: 15px 30px;
            text-decoration: none;
            border-radius: 25px;
            font-weight: bold;
            margin: 1rem 0;
            transition: transform 0.3s, box-shadow 0.3s;
            box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
        }
        .download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(39, 174, 96, 0.4);
        }
        .tip-box {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 5px 5px 0;
        }
        .warning-box {
            background: #f8d7da;
            border-left: 4px solid #dc3545;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 5px 5px 0;
        }
        .success-box {
            background: #d1edff;
            border-left: 4px solid #3498db;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 5px 5px 0;
        }