diff --git a/sigpro-lite.js b/sigpro-lite.js
new file mode 100644
index 0000000..d581393
--- /dev/null
+++ b/sigpro-lite.js
@@ -0,0 +1,192 @@
+let currentContext = null
+const getContext = () => currentContext
+const runInContext = (ctx, fn) => {
+  const prev = currentContext
+  currentContext = ctx
+  try { return fn() }
+  finally { currentContext = prev }
+}
+const onCleanup = (fn) => {
+  const ctx = getContext()
+  if (!ctx) throw new Error('onCleanup must be called within a reactive root')
+  ctx.cleanups.add(fn)
+}
+const onMount = (fn) => {
+  const ctx = getContext()
+  if (!ctx) throw new Error('onMount must be called within a reactive root')
+  queueMicrotask(() => runInContext(ctx, fn))
+}
+const createRoot = (fn) => {
+  const ctx = { cleanups: new Set(), parent: currentContext }
+  return runInContext(ctx, () => {
+    const result = fn(ctx)
+    const destroy = () => { ctx.cleanups.forEach(c => c()); ctx.cleanups.clear() }
+    if (result instanceof Node) result._destroy = destroy
+    return result
+  })
+}
+const createComponent = (fn) => (...args) => {
+  const parent = getContext()
+  const ctx = { cleanups: new Set(), parent }
+  if (parent) parent.cleanups.add(() => { ctx.cleanups.forEach(c => c()); ctx.cleanups.clear() })
+  return runInContext(ctx, () => fn(...args))
+}
+const createSignal = (initialValue) => {
+  const subscribers = new Set()
+  let value = initialValue
+  const signal = (...args) => {
+    if (args.length === 0) {
+      const ctx = getContext()
+      if (ctx?.activeEffect) {
+        subscribers.add(ctx.activeEffect)
+        ctx.activeEffect.deps.add(subscribers)
+      }
+      return value
+    }
+    const next = typeof args[0] === 'function' ? args[0](value) : args[0]
+    if (!Object.is(value, next)) {
+      value = next
+      ;[...subscribers].forEach(e => e.run())
+    }
+    return value
+  }
+  return signal
+}
+const createEffect = (fn) => {
+  const ctx = getContext()
+  if (!ctx) throw new Error('createEffect must be called within a reactive root')
+  const effect = {
+    deps: new Set(),
+    run: () => {
+      effect.deps.forEach(d => d.delete(effect))
+      effect.deps.clear()
+      const prev = ctx.activeEffect
+      ctx.activeEffect = effect
+      try { fn() }
+      finally { ctx.activeEffect = prev }
+    }
+  }
+  onCleanup(() => {
+    effect.deps.forEach(d => d.delete(effect))
+    effect.deps.clear()
+  })
+  effect.run()
+}
+const mount = (component, selector) => {
+  const root = document.querySelector(selector)
+  if (!root) throw new Error(`Selector "${selector}" not found`)
+  if (root._destroy) root._destroy()
+  root.innerHTML = ''
+  const app = createRoot(component)
+  root.appendChild(app)
+  root._destroy = app._destroy
+  return app
+}
+const h = (tag, props, ...children) => {
+  const el = document.createElement(tag)
+  if (props) {
+    Object.entries(props).forEach(([k, v]) => {
+      if (k.startsWith('on')) {
+        const event = k.slice(2).toLowerCase()
+        el.addEventListener(event, v)
+        onCleanup(() => el.removeEventListener(event, v))
+      } else if (k === 'style' && typeof v === 'object') {
+        Object.assign(el.style, v)
+      } else {
+        el.setAttribute(k, v)
+      }
+    })
+  }
+  children.flat().forEach(c => {
+    if (c instanceof Node) el.appendChild(c)
+    else el.appendChild(document.createTextNode(String(c ?? '')))
+  })
+  return el
+}
+const For = createComponent(({ each, children }) => {
+  const container = h('div', { style: 'display:contents' })
+  const marker = document.createTextNode('')
+  container.appendChild(marker)
+  let cache = new Map()
+  const source = typeof each === 'function' ? each : () => each
+  createEffect(() => {
+    const items = source() || []
+    const newCache = new Map()
+    const order = []
+    for (let i = 0; i < items.length; i++) {
+      const item = items[i]
+      const key = typeof item === 'object' && item !== null && 'id' in item ? item.id : i
+      let view = cache.get(key)
+      if (!view) view = createRoot(() => children(item, i))
+      newCache.set(key, view)
+      order.push(key)
+      cache.delete(key)
+    }
+    cache.forEach(v => v._destroy ? v._destroy() : (v.remove?.(), v._destroy?.()))
+    cache = newCache
+    let anchor = marker
+    for (let i = order.length - 1; i >= 0; i--) {
+      const view = newCache.get(order[i])
+      if (view instanceof Node && view.nextSibling !== anchor)
+        container.insertBefore(view, anchor)
+      anchor = view
+    }
+  })
+  onCleanup(() => cache.forEach(v => v._destroy ? v._destroy() : v.remove?.()))
+  return container
+})
+const If = createComponent(({ when, children }) => {
+  const anchor = document.createTextNode('')
+  const container = h('div', { style: 'display:contents' }, anchor)
+  let current = null
+  const cond = typeof when === 'function' ? when : () => when
+  createEffect(() => {
+    const show = !!cond()
+    if (show && !current) {
+      current = createRoot(() => children())
+      container.insertBefore(current, anchor)
+    } else if (!show && current) {
+      if (current._destroy) current._destroy()
+      else current.remove()
+      current = null
+    }
+  })
+  onCleanup(() => current?._destroy?.())
+  return container
+})
+const Router = createComponent(({ routes }) => {
+  const getHash = () => window.location.hash.slice(1) || '/'
+  const path = createSignal(getHash())
+  const handler = () => path(getHash())
+  window.addEventListener('hashchange', handler)
+  onCleanup(() => window.removeEventListener('hashchange', handler))
+  const outlet = h('div', {})
+  let currentView = null
+  createEffect(() => {
+    const cur = path()
+    const match = routes.find(r => {
+      const rParts = r.path.split('/').filter(Boolean)
+      const pParts = cur.split('/').filter(Boolean)
+      return rParts.length === pParts.length && rParts.every((p, i) => p.startsWith(':') || p === pParts[i])
+    }) || routes.find(r => r.path === '*')
+    if (match) {
+      if (currentView?._destroy) currentView._destroy()
+      else if (currentView) currentView.remove()
+      const params = {}
+      match.path.split('/').filter(Boolean).forEach((p, i) => {
+        if (p.startsWith(':')) params[p.slice(1)] = cur.split('/').filter(Boolean)[i]
+      })
+      currentView = createRoot(() => match.component(params))
+      outlet.appendChild(currentView)
+    }
+  })
+  onCleanup(() => currentView?._destroy?.())
+  return outlet
+})
+Router.to = (path) => window.location.hash = path.replace(/^#?\/?/, '#/')
+Router.back = () => window.history.back()
+Router.path = () => window.location.hash.slice(1) || '/'
+const SigPro = { createRoot, createComponent, createSignal, createEffect, onCleanup, onMount, mount, h, For, If, Router }
+if (typeof window !== 'undefined') Object.assign(window, SigPro)
+export { createRoot, createComponent, createSignal, createEffect, onCleanup, onMount, mount, h, For, If, Router }
+export default SigPro
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