Develop a dashboard interface which should serve as the main interface for a productivity SaaS platform. The design requires a left sidebar which contains navigation elements that include Dashboard and Tasks and Calendar and Analytics and Settings. The top section of the interface contains a search function and notification area and a user profile icon. The main section should display an overview panel which shows KPIs (tasks completed and work hours and upcoming deadlines) and a calendar widget and a task list with status tags. The design should use a contemporary user interface style which combines rounded cards with soft shadows and simple data presentation elements. The design should use a cool-toned color scheme which includes blues and greys and it should have crisp icons and enough space between elements to create a professional and airy design structure.