Create a modern, responsive landing page for a fictional SaaS company. The landing page should include the following sections:

• A header with the company logo, navigation links, and a call-to-action button.
• A hero section with a catchy headline, brief description, and a prominent call-to-action.
• A features section highlighting 3-4 key features of StreamLine.
• A testimonials section with quotes from satisfied customers.
• A pricing section with different plan options.
• A final call-to-action section to encourage sign-ups.
• A footer with important links and social media icons.