body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; background-color: #f9f9f9; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #1a365d; color: white; padding: 15px 0; text-align: center; position: relative; }
        .logo { font-size: 28px; font-weight: bold; text-transform: uppercase; }
        nav { display: flex; justify-content: center; gap: 20px; margin-top: 10px; }
        nav a { color: white; text-decoration: none; }
        .mobile-nav-toggle { display: none; position: absolute; top: 15px; right: 15px; cursor: pointer; }
        h1 { font-size: 2.5em; margin-bottom: 20px; color: #1a365d; }
        h2 { font-size: 1.8em; margin: 30px 0 15px; color: #2c5282; }
        h3 { font-size: 1.4em; margin: 25px 0 10px; color: #4299e1; }
        p { margin-bottom: 15px; }
        .btn { display: inline-block; background-color: #48bb78; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; margin: 10px 0; }
        .download-btn { background-color: #4299e1; }
        .login-btn { background-color: #f56565; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        .tags { margin: 20px 0; }
        .tag { display: inline-block; background-color: #e2e8f0; padding: 5px 10px; border-radius: 20px; margin-right: 5px; margin-bottom: 5px; }
        footer { background-color: #1a365d; color: white; text-align: center; padding: 20px 0; margin-top: 30px; }
        @media (max-width: 768px) {
            nav { flex-direction: column; display: none; }
            .mobile-nav-toggle { display: block; }
            nav.active { display: flex; }
            h1 { font-size: 2em; }
            h2 { font-size: 1.5em; }
            h3 { font-size: 1.2em; }
        }