* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #2c3e50;
            --secondary-color: #e74c3c;
            --accent-color: #f39c12;
            --text-color: #333;
            --light-bg: #f8f9fa;
            --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-color: var(--primary-color);
            color: var(--white);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--white);
            text-decoration: none;
        }
        .logo span {
            color: var(--accent-color);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            color: var(--white);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
        }
        nav a:hover {
            color: var(--accent-color);
        }
        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 1.5rem;
        }
        .breadcrumb {
            background-color: var(--white);
            padding: 1rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow);
        }
        .breadcrumb-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        main {
            background: var(--white);
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        article {
            line-height: 1.8;
        }
        h1 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            font-size: 2.2rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            color: var(--secondary-color);
            margin: 2rem 0 1rem 0;
            font-size: 1.8rem;
        }
        h3 {
            color: var(--primary-color);
            margin: 1.5rem 0 1rem 0;
            font-size: 1.4rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fff9e6;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
        }
        .feature-item {
            background: var(--light-bg);
            padding: 1.5rem;
            border-radius: 8px;
            text-align: center;
            transition: var(--transition);
        }
        .feature-item:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .feature-icon {
            font-size: 2rem;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .article-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .search-form {
            background: var(--white);
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
        }
        .search-form h3 {
            margin-bottom: 1rem;
        }
        .search-box {
            display: flex;
            gap: 0.5rem;
        }
        .search-box input {
            flex: 1;
            padding: 0.75rem;
            border: 2px solid #ddd;
            border-radius: 4px;
            font-size: 1rem;
        }
        .search-box button {
            background: var(--secondary-color);
            color: var(--white);
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: #c0392b;
        }
        .rating-system {
            background: var(--white);
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
            text-align: center;
        }
        .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);
        }
        .comment-system {
            background: var(--white);
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 4px;
            margin-bottom: 1rem;
            resize: vertical;
            min-height: 100px;
        }
        .comment-form button {
            background: var(--primary-color);
            color: var(--white);
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 4px;
            cursor: pointer;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: #1a252f;
        }
        aside {
            background: var(--white);
            padding: 2rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        .sidebar-widget {
            margin-bottom: 2rem;
        }
        .sidebar-widget h3 {
            color: var(--secondary-color);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light-bg);
        }
        .download-btn {
            display: block;
            width: 100%;
            background: var(--secondary-color);
            color: var(--white);
            text-align: center;
            padding: 1rem;
            border-radius: 8px;
            text-decoration: none;
            font-weight: bold;
            margin: 1rem 0;
            transition: var(--transition);
        }
        .download-btn:hover {
            background: #c0392b;
            transform: translateY(-2px);
        }
        .web-links {
            background: var(--primary-color);
            padding: 3rem 0;
            margin-top: 3rem;
        }
        .web-links-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }
        .web-link {
            background: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .web-link:hover {
            background: rgba(255,255,255,0.2);
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--white);
            text-decoration: none;
        }
        footer {
            background: #1a252f;
            color: var(--white);
            text-align: center;
            padding: 2rem 0;
        }
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
            }
            nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--primary-color);
                padding: 1rem;
            }
            nav ul.show {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .web-links-container {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.6s ease-out;
        }