* {
            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;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
        }
        .logo a {
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .search-form {
            display: flex;
            gap: 10px;
        }
        .search-form input {
            padding: 10px;
            border: none;
            border-radius: 5px;
            min-width: 250px;
        }
        .search-form button {
            padding: 10px 20px;
            background: #ff6b35;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s ease;
        }
        .search-form button:hover {
            background: #e55a2b;
        }
        nav {
            background: #2a5298;
            margin-top: 1rem;
        }
        .nav-desktop {
            display: flex;
            list-style: none;
            justify-content: center;
        }
        .nav-desktop li {
            position: relative;
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            padding: 15px 25px;
            display: block;
            transition: background 0.3s ease;
        }
        .nav-desktop a:hover {
            background: rgba(255,255,255,0.1);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            list-style: none;
            background: #2a5298;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            z-index: 1000;
        }
        .nav-mobile.active {
            display: block;
        }
        .nav-mobile a {
            color: white;
            text-decoration: none;
            padding: 15px 20px;
            display: block;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .breadcrumb {
            background: #e9ecef;
            padding: 15px 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 10px;
            color: #6c757d;
        }
        .breadcrumb a {
            color: #1e3c72;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            margin: 2rem 0;
        }
        .content {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 2px 20px rgba(0,0,0,0.1);
        }
        h1 {
            color: #1e3c72;
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            color: #2a5298;
            font-size: 1.8rem;
            margin: 2rem 0 1rem 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e9ecef;
        }
        h3 {
            color: #ff6b35;
            font-size: 1.4rem;
            margin: 1.5rem 0 1rem 0;
        }
        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;
        }
        .feature-list {
            list-style: none;
            margin: 1.5rem 0;
        }
        .feature-list li {
            padding: 10px 0;
            padding-left: 30px;
            position: relative;
        }
        .feature-list li::before {
            content: "✓";
            color: #28a745;
            font-weight: bold;
            position: absolute;
            left: 0;
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 1.5rem 0;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        .download-btn {
            display: inline-block;
            background: linear-gradient(135deg, #28a745, #20c997);
            color: white;
            padding: 15px 30px;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            margin: 1rem 0;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
        }
        .download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
        }
        .comment-section {
            margin-top: 3rem;
            border-top: 2px solid #e9ecef;
            padding-top: 2rem;
        }
        .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-group input,
        .form-group textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-family: inherit;
        }
        .rating-system {
            display: flex;
            gap: 10px;
            align-items: center;
            margin-bottom: 1rem;
        }
        .star-rating {
            display: flex;
            gap: 5px;
        }
        .star {
            color: #ddd;
            cursor: pointer;
            font-size: 1.5rem;
            transition: color 0.2s ease;
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        .submit-btn {
            background: #1e3c72;
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s ease;
        }
        .submit-btn:hover {
            background: #2a5298;
        }
        .footer-links {
            background: #e9ecef;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: white;
            padding: 1rem;
            border-radius: 5px;
            text-align: center;
            transition: transform 0.3s ease;
        }
        .web-link:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        }
        .web-link a {
            color: #1e3c72;
            text-decoration: none;
            font-weight: bold;
        }
        footer {
            background: #1e3c72;
            color: white;
            text-align: center;
            padding: 2rem 0;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }
        @media (max-width: 768px) {
            .header-top {
                flex-direction: column;
                gap: 1rem;
            }
            .search-form input {
                min-width: 200px;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            main {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 2rem;
            }
            .web-links {
                grid-template-columns: 1fr;
            }
            .footer-content {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 10px;
            }
            .content, .sidebar {
                padding: 1rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .content, .sidebar {
            animation: fadeIn 0.6s ease-out;
        }
        @media print {
            header, nav, .sidebar, .comment-section, .footer-links, footer {
                display: none;
            }
            main {
                grid-template-columns: 1fr;
            }
            .content {
                box-shadow: none;
                padding: 0;
            }
        }