# AGENTS.md

## Project Overview

Single-file Go HTTP server for electronic signature capture and archiving. Frontend HTML is embedded into the Go binary via `//go:embed`.

## Build & Run

```bash
# Local development
go run main.go
# Server starts on port 10081

# Cross-compile (Windows/Linux)
build.bat
# Outputs to dist/ with timestamped filenames
```

## Architecture

- `main.go` — Entire backend. Embeds `index.html`, serves it at `/`, handles `POST /upload` to save base64 PNGs to `uploads/<name>/<name>+<date>.png`
- `index.html` — Standalone frontend (Tailwind CDN, Phosphor Icons, canvas-based signature)
- `uploads/` — Runtime signature storage (gitignored)

## Key Constraints

- No `go.mod` present — initialize one if adding dependencies
- No tests exist
- Frontend uses CDN resources (Tailwind, Phosphor Icons) — no local build step
- Upload handler validates name non-empty, strips base64 prefix, saves as PNG
- Port is hardcoded to `:10081`