Kirana Shop Accounting Web App

Title: Build Single-File HTML Business Accounting Web App for Indian Kirana Shops Overview: I need a developer to create a responsive, offline-ready accounting web app for small Indian shop owners (kirana, retail, general stores). The app should be simple, mobile-first, and easy to use for semi-literate shopkeepers. Tech Stack Requirements: Pure HTML, CSS, Vanilla JS (no frameworks) Chart.js via CDN for charts Google Fonts: DM Sans + DM Serif Display localStorage for data persistence Fully responsive (mobile + desktop) PWA-ready (works offline) Color Theme: Background: #f5f7f6 Sidebar: #2e7d32 (forest green) Buttons: #f4c430 (gold), dark text Cards: #ffffff Accent: #2e7d32 Error/Loss: #c62828 Warning: #e65100 Pages / Sections: Dashboard (metrics, today summary, recent sales, analytics bars) Sales Entry (form, profit preview, sales table) Invoice (create bill, print/PDF, invoice history) Stock (add/update stock, low stock alerts, stock level bars) Reports (date filter, product breakdown, loss analysis) Charts (daily profit, top products, revenue vs cost, P/L pie) Pricing (Free ₹0, Pro ₹49/month) Profile (shop details, GST, save to localStorage) Features: Sidebar navigation (collapsible on mobile) Dark mode toggle (saved to localStorage) Multi-language support (Hindi + English + 2–3 regional languages. Indian languages) Global search across sales Auto stock deduction on sale entry Profit/loss preview while typing Low stock + out of stock alerts CSV export for sales and reports Invoice print/PDF via window.print() Edit and delete for sales and stock Toast notifications Profit/loss row color coding in tables Extra Features: Razorpay UPI payment button integration WhatsApp share button on invoice GST calculation (18%) toggle on invoice Multi-user login with PIN Barcode scanner input support UI Style: Font: DM Sans (body), DM Serif Display (headings/numbers) Cards with subtle green shadow Metric cards with colored left border + hover lift Pill badges for status (green/red/amber) SVG checkmarks in pricing cards Smooth transitions on interactive elements Mobile hamburger menu with overlay Sticky topbar with search, language, dark mode Data: Default sample products: Lays Chips, Parle-G, Maggi, Kurkure localStorage keys: eh_sales, eh_stocks, eh_invoices, eh_profile Ownership: All code, designs, and deliverables will belong to me. Freelancer must agree to an NDA and ownership clause before starting. Budget & Timeline: Please propose your estimated cost and delivery time.