Invoice Management System

Just wrapped up a full styling overhaul - ditched vanilla CSS for Tailwind CSS v4. Way cleaner code, solid mobile-first responsive base that matches our Figma specs perfectly.

1. What I Did
   1.1 TW v4 Migration + Theme Setup
   Nuked old CSS: Deleted all those component .css files (App.css, Sidebar.css, InvoiceForm.css etc.) - everything’s now pure TW utility classes

@theme magic: Set up TW v4’s new module system. All my custom vars (–color-primary, –sidebar-bg) live in src/index.css via @theme - no more tailwind.config.js

Light/Dark modes: Native [data-theme=“dark”] support with smooth transitions. Fixed sidebar bg (#141625) for pixel-perfect dark mode

1.2 Forms & Custom Controls
Custom dropdowns/dates: Built CustomDropdown (payment terms) + CustomDatePicker (issue date) to replace lame browser defaults. Custom chevrons, purple hovers, proper padding - matches designs 1:1

Fixed invoice bug: ‘Issue Date’ was hardcoded disabled on new invoices. Now only disables when !!existingInvoice

1.3 Layout + Responsive
Invoices/modals: Added sm:, md:, xl: breakpoints. InvoiceForm goes full-screen mobile → desktop sidebar overlay (no clipping)

Icon cleanup: Swapped unicode arrows (←) for proper SVG chevrons + “Go back” icons in InvoiceDetail/InvoiceForm

Summary
TW v4 migration done , cleaner code, pixel-perfect designs, fully responsive. Next up: perf audits or more component abstractions