Build a client portal web app for service businesses with: 1) Branded login page for clients with email/password auth 2) Client dashboard showing active projects, recent messages, pending approvals, and upcoming deadlines 3) Project workspace with status timeline, milestones, file attachments, and progress indicators 4) Document sharing with secure file upload, download, and version history 5) Messaging system between client and service provider with read receipts 6) Approval workflow for designs, documents, and deliverables with accept/reject and feedback 7) Task list with due dates, assigned team members, and completion tracking 8) Billing section showing invoices, payment history, and outstanding balances 9) Notification center for new messages, approvals needed, and project updates 10) Admin/provider dashboard for managing all clients, projects, and team assignments. Use a professional portal aesthetic with a sidebar navigation and card-based project views.