* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #ff6b00;
            --secondary-color: #1a237e;
            --accent-color: #ffd600;
            --text-color: #333;
            --light-bg: #f5f5f5;
            --white: #ffffff;
            --shadow: 0 2px 10px 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);
        }
        header {
            background: linear-gradient(135deg, var(--secondary-color), #303f9f);
            color: var(--white);
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--accent-color);
            text-decoration: none;
        }
        .logo:hover {
            color: var(--white);
            transition: var(--transition);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-mobile {
            display: none;
        }
        @media (max-width: 768px) {
            .nav-mobile {
                display: block;
            }
        }
        .nav-link {
            color: var(--white);
            text-decoration: none;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: var(--transition);
        }
        .nav-link:hover {
            background-color: var(--primary-color);
            transform: translateY(-2px);
        }
        .hamburger {
            background: none;
            border: none;
            color: var(--white);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .mobile-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--secondary-color);
            padding: 1rem;
        }
        .mobile-menu.active {
            display: block;
        }
        .breadcrumb {
            background: var(--white);
            padding: 1rem 0;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .breadcrumb a {
            color: var(--secondary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
        }
        .container {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
            }
        }
        .main-content {
            background: var(--white);
            padding: 2rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: var(--white);
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .search-form {
            margin-bottom: 2rem;
        }
        .search-box {
            display: flex;
            gap: 0.5rem;
        }
        .search-input {
            flex: 1;
            padding: 0.75rem;
            border: 2px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
        }
        .search-btn {
            background: var(--primary-color);
            color: var(--white);
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 5px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }
        h1 {
            color: var(--secondary-color);
            font-size: 2.5rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        h2 {
            color: var(--primary-color);
            font-size: 2rem;
            margin: 2rem 0 1rem 0;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h3 {
            color: var(--secondary-color);
            font-size: 1.5rem;
            margin: 1.5rem 0 1rem 0;
        }
        p {
            margin-bottom: 1rem;
            text-align: justify;
        }
        .highlight {
            background: var(--accent-color);
            padding: 0.2rem 0.5rem;
            border-radius: 3px;
            font-weight: bold;
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
        }
        .download-section {
            background: linear-gradient(135deg, var(--primary-color), #ff8f00);
            color: var(--white);
            padding: 2rem;
            border-radius: 10px;
            text-align: center;
            margin: 2rem 0;
        }
        .download-btn {
            display: inline-block;
            background: var(--accent-color);
            color: var(--secondary-color);
            padding: 1rem 2rem;
            text-decoration: none;
            border-radius: 50px;
            font-weight: bold;
            font-size: 1.2rem;
            margin: 1rem 0;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }
        .download-btn:hover {
            transform: translateY(-5px) scale(1.05);
            box-shadow: 0 8px 25px rgba(0,0,0,0.3);
        }
        .comment-section {
            margin: 3rem 0;
            padding: 2rem;
            background: var(--light-bg);
            border-radius: 10px;
        }
        .comment-form {
            display: grid;
            gap: 1rem;
            margin-bottom: 2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-input, .form-textarea {
            padding: 0.75rem;
            border: 2px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-input:focus, .form-textarea:focus {
            border-color: var(--primary-color);
            outline: none;
        }
        .submit-btn {
            background: var(--primary-color);
            color: var(--white);
            border: none;
            padding: 1rem 2rem;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .submit-btn:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
        }
        .rating-section {
            text-align: center;
            margin: 2rem 0;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: var(--accent-color);
        }
        .footer-links {
            background: var(--white);
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .links-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: var(--light-bg);
            padding: 1rem;
            border-radius: 5px;
            text-align: center;
        }
        .web-link a {
            color: var(--secondary-color);
            text-decoration: none;
            font-weight: bold;
        }
        .web-link a:hover {
            color: var(--primary-color);
        }
        footer {
            background: var(--secondary-color);
            color: var(--white);
            text-align: center;
            padding: 2rem 0;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .main-content, .sidebar {
                padding: 1rem;
            }
            .download-btn {
                padding: 0.75rem 1.5rem;
                font-size: 1rem;
            }
        }
        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }
        .text-center {
            text-align: center;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }