body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 0; }
        .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
        header { background-color: #1e88e5; color: white; padding: 20px; text-align: center; }
        .logo { font-size: 28px; font-weight: bold; }
        nav { background-color: #0d47a1; padding: 10px; }
        nav ul { list-style: none; padding: 0; display: flex; justify-content: center; }
        nav ul li { margin: 0 15px; }
        nav ul li a { color: white; text-decoration: none; }
        .mobile-menu { display: none; }
        h1 { color: #1e88e5; margin-top: 30px; }
        h2 { color: #0d47a1; margin-top: 25px; }
        h3 { color: #1565c0; margin-top: 20px; }
        .download-btn, .login-btn { 
            display: inline-block; 
            background-color: #4caf50; 
            color: white; 
            padding: 12px 25px; 
            margin: 15px 0; 
            text-decoration: none; 
            border-radius: 5px; 
            font-weight: bold; 
        }
        .login-btn { background-color: #2196f3; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        footer { background-color: #333; color: white; padding: 20px; text-align: center; margin-top: 40px; }
        .tags { margin: 20px 0; }
        .tag { display: inline-block; background-color: #607d8b; color: white; padding: 5px 10px; margin: 5px; border-radius: 3px; }
        @media (max-width: 768px) {
            nav ul { flex-direction: column; align-items: center; }
            .mobile-menu { display: block; background-color: #0d47a1; color: white; padding: 10px; text-align: center; cursor: pointer; }
            nav ul.hidden { display: none; }
        }