I need a lightweight web application that lets me keep everyday operations in one place. The must-have features are a client directory where I can add, edit, or delete entries; an invoicing area for creating, updating, and removing simple invoices; and a sales reporting view that draws on those invoices so I can quickly gauge performance. Please build everything with plain HTML, modern CSS, and vanilla JavaScript. The interface has to stay clean and intuitive while responding smoothly from large desktop screens down to mobile widths. Deliverables • Fully functional front-end with well-commented source code • Persistent data layer (your preferred lightweight approach) wired to the client, invoice, and report views • Brief setup and deployment guide Acceptance criteria • All client and invoice actions work without a page reload • Sales reports generate instantly from stored invoice data • Layout remains usable at 360 px and above • Final hand-off completed within 14 days of project start If the scope is clear and the timeline fits your schedule, I’m ready to move forward right away.