body { font-family: 'Arial', sans-serif; line-height: 1.6; color: #333; max-width: 1200px; margin: 0 auto; padding: 20px; background-color: #f9f9f9; }
        header { background-color: #2c3e50; color: white; padding: 15px; position: relative; }
        .logo { font-size: 24px; font-weight: bold; text-transform: uppercase; letter-spacing: 2px; }
        nav ul { list-style: none; padding: 0; display: flex; gap: 20px; }
        nav a { color: white; text-decoration: none; }
        .mobile-toggle { display: none; position: absolute; right: 20px; top: 15px; cursor: pointer; }
        h1 { font-size: 28px; margin-bottom: 20px; color: #2c3e50; }
        h2 { font-size: 22px; margin: 25px 0 15px; color: #3498db; }
        h3 { font-size: 18px; margin: 20px 0 10px; color: #e74c3c; }
        .btn { display: inline-block; padding: 10px 20px; background-color: #2ecc71; color: white; text-decoration: none; border-radius: 5px; margin: 10px 0; }
        .download-btn { background-color: #3498db; }
        .login-btn { background-color: #e74c3c; }
        img { max-width: 100%; height: auto; margin: 20px 0; }
        footer { margin-top: 40px; padding: 20px; background-color: #2c3e50; color: white; text-align: center; }
        @media (max-width: 768px) {
            nav ul { display: none; flex-direction: column; }
            nav.active ul { display: flex; }
            .mobile-toggle { display: block; }
            .logo { font-size: 20px; }
        }