Build a modern client portal

Design a sleek, modern, and minimalistic client portal website with a secure login system to ensure only authorized clients gain access. Once logged in, users land on a clean, user-friendly dashboard featuring large, evenly spaced square tiles (cards), each representing a function such as accessing tool links, viewing a contact list, downloading documents, submitting application forms, or watching training videos. The interface should be uncluttered, professional, and easy to navigate, with ample white space, a consistent grayscale palette accented by a single highlight color, and a layout that feels like a personalized workspace. The design must align with the existing website’s style while remaining fully mobile-responsive and accessible.