diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..26c6ebf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+node_modules/
+dist/
+.vite/
+*.local
+.env*
+.DS_Store
diff --git a/README.md b/README.md
index 5bc0522..233d377 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,51 @@
 # messenzy-widget
 
-Embeddable JS chat widget for Messenzy (Preact + Vite)
\ No newline at end of file
+Embeddable JS chat widget for the Messenzy platform. Preact 10 + Vite 6, outputs a single IIFE (~30-50 KB minified) for direct `<script>` inclusion.
+
+## Integration
+
+```html
+<!-- 1. Add a mount point (optional — widget auto-creates one if absent) -->
+<div id="messenzy-root"></div>
+
+<!-- 2. Load the widget -->
+<script
+  src="https://messenger-bot.mind4solutions.cloud/widget/messenzy-widget.iife.js"
+  data-bot-id="YOUR_BOT_ID"
+  data-api-key="YOUR_API_KEY"
+  data-position="bottom-right"
+></script>
+```
+
+### Script attributes
+
+| Attribute | Required | Default | Description |
+|---|---|---|---|
+| `data-bot-id` | yes | — | Bot identifier |
+| `data-api-key` | yes | — | Public API key for the bot |
+| `data-server-url` | no | derived from script `src` origin | Override API/WS server base URL |
+| `data-position` | no | `bottom-right` | `bottom-right` or `bottom-left` |
+
+### Theme customization
+
+Set CSS variables on `:root` or any parent element before loading the widget:
+
+```css
+:root {
+  --messenzy-primary: #6366f1; /* bubble + send button color */
+  --messenzy-accent:  #f43f5e; /* unread badge color */
+}
+```
+
+## Build
+
+```bash
+npm install
+npm run build     # outputs dist/messenzy-widget.iife.js + dist/messenzy-widget.js (ESM)
+npm run typecheck # no-emit TypeScript check
+npm run dev       # Vite dev server
+```
+
+## Spec
+
+See `messenger-bot/docs/superpowers/specs/2026-04-25-sp6-webchat-widget-design.md` for the full SP6 webchat widget design specification.
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..9661dfb
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1150 @@
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+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.4"
+      },
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+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
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+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/vite": {
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.25.0",
+        "fdir": "^6.4.4",
+        "picomatch": "^4.0.2",
+        "postcss": "^8.5.3",
+        "rollup": "^4.34.9",
+        "tinyglobby": "^0.2.13"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "jiti": ">=1.21.0",
+        "less": "*",
+        "lightningcss": "^1.21.0",
+        "sass": "*",
+        "sass-embedded": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..350cf3f
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "messenzy-widget",
+  "version": "0.1.0",
+  "description": "Embeddable JS chat widget for Messenzy",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "preact": "^10.19.0"
+  },
+  "devDependencies": {
+    "vite": "^6.0.0",
+    "typescript": "^5.6.0",
+    "@types/node": "^22.0.0"
+  }
+}
diff --git a/src/config.ts b/src/config.ts
new file mode 100644
index 0000000..05ab8e0
--- /dev/null
+++ b/src/config.ts
@@ -0,0 +1,37 @@
+export type WidgetConfig = {
+  botId: string;
+  apiKey: string;
+  serverUrl: string;
+  position?: 'bottom-right' | 'bottom-left';
+};
+
+export function parseConfig(): WidgetConfig | null {
+  const script =
+    (document.currentScript as HTMLScriptElement | null) ??
+    (document.querySelector(
+      'script[data-bot-id][data-api-key]',
+    ) as HTMLScriptElement | null);
+  if (!script) return null;
+
+  const botId = script.getAttribute('data-bot-id');
+  const apiKey = script.getAttribute('data-api-key');
+  const serverUrl =
+    script.getAttribute('data-server-url') ?? deriveServerFromSrc(script.src);
+  const position =
+    (script.getAttribute('data-position') as
+      | 'bottom-right'
+      | 'bottom-left'
+      | null) ?? 'bottom-right';
+
+  if (!botId || !apiKey) return null;
+
+  return { botId, apiKey, serverUrl, position };
+}
+
+function deriveServerFromSrc(src: string): string {
+  try {
+    return new URL(src).origin;
+  } catch {
+    return 'https://messenger-bot.mind4solutions.cloud';
+  }
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..1cc20b1
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,40 @@
+import { h, render } from 'preact';
+import { Widget } from './ui/widget.js';
+import { parseConfig } from './config.js';
+import cssText from './ui/theme.css?inline';
+
+// Inject styles into shadow-free <style> on first load
+(function injectStyles() {
+  if (document.getElementById('messenzy-styles')) return;
+  const style = document.createElement('style');
+  style.id = 'messenzy-styles';
+  style.textContent = cssText;
+  document.head.appendChild(style);
+})();
+
+function boot() {
+  const config = parseConfig();
+  if (!config) {
+    console.warn(
+      '[Messenzy] Missing data-bot-id or data-api-key on script tag. Widget disabled.',
+    );
+    return;
+  }
+
+  const root =
+    document.getElementById('messenzy-root') ??
+    (() => {
+      const d = document.createElement('div');
+      d.id = 'messenzy-root';
+      document.body.appendChild(d);
+      return d;
+    })();
+
+  render(h(Widget, { config }), root);
+}
+
+if (document.readyState === 'loading') {
+  document.addEventListener('DOMContentLoaded', boot);
+} else {
+  boot();
+}
diff --git a/src/storage/visitor.ts b/src/storage/visitor.ts
new file mode 100644
index 0000000..6f56bc9
--- /dev/null
+++ b/src/storage/visitor.ts
@@ -0,0 +1,14 @@
+const KEY = 'messenzy_visitor_id';
+
+export function getVisitorId(): string {
+  try {
+    const existing = localStorage.getItem(KEY);
+    if (existing && /^[0-9a-f-]{36}$/i.test(existing)) return existing;
+    const id = crypto.randomUUID();
+    localStorage.setItem(KEY, id);
+    return id;
+  } catch {
+    // localStorage may be blocked (incognito + cookies disabled); fall back to in-memory
+    return crypto.randomUUID();
+  }
+}
diff --git a/src/transport/ws-client.ts b/src/transport/ws-client.ts
new file mode 100644
index 0000000..4302764
--- /dev/null
+++ b/src/transport/ws-client.ts
@@ -0,0 +1,198 @@
+import type { WidgetConfig } from '../config.js';
+
+export type WsMessage =
+  | { type: 'welcome'; visitor_id: string }
+  | {
+      type: 'history';
+      messages: Array<{
+        id: string;
+        from: 'bot' | 'user';
+        text: string;
+        at: string;
+      }>;
+    }
+  | { type: 'bot_message'; id: string; text: string; created_at: string }
+  | { type: 'typing'; state: 'on' | 'off' }
+  | { type: 'handoff'; message: string }
+  | { type: 'error'; code: string; retry_after_s?: number }
+  | { type: 'pong' };
+
+export type ClientMessage =
+  | { type: 'user_message'; id: string; text: string }
+  | { type: 'ping' };
+
+export type Transport = {
+  send: (msg: ClientMessage) => void;
+  close: () => void;
+  isConnected: () => boolean;
+};
+
+type TransportOpts = {
+  botId: string;
+  apiKey: string;
+  visitorId: string;
+  serverUrl: string;
+  onMessage: (msg: WsMessage) => void;
+  onConnectionChange?: (connected: boolean) => void;
+};
+
+const MAX_WS_RETRIES = 5;
+const POLL_INTERVAL_MS = 5000;
+const PING_INTERVAL_MS = 30000;
+
+export function createTransport(opts: TransportOpts): Transport {
+  let ws: WebSocket | null = null;
+  let pollTimer: ReturnType<typeof setInterval> | null = null;
+  let pingTimer: ReturnType<typeof setInterval> | null = null;
+  let reconnectAttempts = 0;
+  let pendingMessages: ClientMessage[] = [];
+  let lastSeenAt: string | null = null;
+  let usingPolling = false;
+  let closed = false;
+
+  function connectWs() {
+    if (closed) return;
+    const wsUrl =
+      opts.serverUrl.replace(/^http/, 'ws') +
+      `/webchat/ws?botId=${encodeURIComponent(opts.botId)}` +
+      `&apiKey=${encodeURIComponent(opts.apiKey)}` +
+      `&visitorId=${encodeURIComponent(opts.visitorId)}`;
+    try {
+      ws = new WebSocket(wsUrl);
+    } catch {
+      onWsClose();
+      return;
+    }
+
+    ws.onopen = () => {
+      reconnectAttempts = 0;
+      opts.onConnectionChange?.(true);
+      // Flush pending messages accumulated while disconnected
+      for (const m of pendingMessages) ws!.send(JSON.stringify(m));
+      pendingMessages = [];
+      pingTimer = setInterval(() => {
+        try {
+          ws?.send(JSON.stringify({ type: 'ping' }));
+        } catch {
+          /* ignore */
+        }
+      }, PING_INTERVAL_MS);
+    };
+
+    ws.onmessage = (ev) => {
+      try {
+        const msg = JSON.parse(ev.data as string) as WsMessage;
+        opts.onMessage(msg);
+      } catch {
+        /* ignore malformed frames */
+      }
+    };
+
+    ws.onclose = onWsClose;
+    ws.onerror = () => {
+      /* close handler runs after error */
+    };
+  }
+
+  function onWsClose() {
+    if (closed) return;
+    if (pingTimer) {
+      clearInterval(pingTimer);
+      pingTimer = null;
+    }
+    opts.onConnectionChange?.(false);
+    reconnectAttempts++;
+    if (reconnectAttempts <= MAX_WS_RETRIES) {
+      const delay = Math.min(
+        1000 * Math.pow(2, reconnectAttempts - 1),
+        30_000,
+      );
+      setTimeout(connectWs, delay);
+    } else {
+      // Exceeded retry budget — fall back to HTTP polling
+      usingPolling = true;
+      void startPolling();
+    }
+  }
+
+  async function startPolling() {
+    pollTimer = setInterval(async () => {
+      if (closed) return;
+      const url =
+        `${opts.serverUrl}/webchat/history?` +
+        `botId=${encodeURIComponent(opts.botId)}` +
+        `&apiKey=${encodeURIComponent(opts.apiKey)}` +
+        `&visitorId=${encodeURIComponent(opts.visitorId)}` +
+        (lastSeenAt ? `&since=${encodeURIComponent(lastSeenAt)}` : '');
+      try {
+        const res = await fetch(url, { credentials: 'omit' });
+        if (!res.ok) return;
+        const data = (await res.json()) as {
+          messages?: Array<{ id: string; text: string; at: string }>;
+        };
+        if (data.messages) {
+          for (const m of data.messages) {
+            opts.onMessage({
+              type: 'bot_message',
+              id: m.id,
+              text: m.text,
+              created_at: m.at,
+            });
+            lastSeenAt = m.at;
+          }
+        }
+      } catch {
+        /* network failure — will retry on next interval */
+      }
+    }, POLL_INTERVAL_MS);
+    opts.onConnectionChange?.(false); // polling = not "connected" in strict sense
+  }
+
+  async function sendViaHttp(msg: ClientMessage) {
+    if (msg.type !== 'user_message') return;
+    try {
+      await fetch(`${opts.serverUrl}/webchat/msg`, {
+        method: 'POST',
+        headers: { 'content-type': 'application/json' },
+        body: JSON.stringify({
+          botId: opts.botId,
+          apiKey: opts.apiKey,
+          visitorId: opts.visitorId,
+          text: msg.text,
+          idempotency_key: msg.id,
+        }),
+        credentials: 'omit',
+      });
+    } catch {
+      /* ignore — user will see message unacknowledged */
+    }
+  }
+
+  connectWs();
+
+  return {
+    send(msg) {
+      if (usingPolling) {
+        void sendViaHttp(msg);
+        return;
+      }
+      if (ws && ws.readyState === WebSocket.OPEN) {
+        ws.send(JSON.stringify(msg));
+      } else {
+        pendingMessages.push(msg);
+      }
+    },
+    close() {
+      closed = true;
+      if (pingTimer) clearInterval(pingTimer);
+      if (pollTimer) clearInterval(pollTimer);
+      if (ws) ws.close();
+    },
+    isConnected() {
+      return !!(ws && ws.readyState === WebSocket.OPEN);
+    },
+  };
+}
+
+// Re-export WidgetConfig so callers can import from one place if needed
+export type { WidgetConfig };
diff --git a/src/ui/bubble.tsx b/src/ui/bubble.tsx
new file mode 100644
index 0000000..3e7d717
--- /dev/null
+++ b/src/ui/bubble.tsx
@@ -0,0 +1,50 @@
+import { h } from 'preact';
+
+type BubbleProps = {
+  open: boolean;
+  position: 'bottom-right' | 'bottom-left';
+  onClick: () => void;
+};
+
+export function Bubble({ open, position, onClick }: BubbleProps) {
+  const posClass = position === 'bottom-left' ? 'mz-bubble--left' : 'mz-bubble--right';
+
+  return (
+    <div class="messenzy-widget">
+      <button
+        class={`mz-bubble ${posClass}`}
+        onClick={onClick}
+        aria-label={open ? 'Close chat' : 'Open chat'}
+        aria-expanded={open}
+      >
+        <span class="mz-bubble__icon">
+          {open ? <CloseIcon /> : <ChatIcon />}
+        </span>
+      </button>
+    </div>
+  );
+}
+
+function ChatIcon() {
+  return (
+    <svg width="24" height="24" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+      <path
+        d="M20 2H4C2.9 2 2 2.9 2 4V22L6 18H20C21.1 18 22 17.1 22 16V4C22 2.9 21.1 2 20 2Z"
+        fill="currentColor"
+      />
+    </svg>
+  );
+}
+
+function CloseIcon() {
+  return (
+    <svg width="20" height="20" viewBox="0 0 20 20" fill="none" aria-hidden="true">
+      <path
+        d="M15 5L5 15M5 5L15 15"
+        stroke="currentColor"
+        stroke-width="2"
+        stroke-linecap="round"
+      />
+    </svg>
+  );
+}
diff --git a/src/ui/message.tsx b/src/ui/message.tsx
new file mode 100644
index 0000000..cf63715
--- /dev/null
+++ b/src/ui/message.tsx
@@ -0,0 +1,29 @@
+import { h } from 'preact';
+
+type MessageProps = {
+  id: string;
+  from: 'bot' | 'user';
+  text: string;
+  at: string;
+};
+
+export function Message({ from, text, at }: MessageProps) {
+  const time = formatTime(at);
+
+  return (
+    <div class={`mz-msg mz-msg--${from}`}>
+      <div class="mz-msg__bubble">{text}</div>
+      {time && <span class="mz-msg__time">{time}</span>}
+    </div>
+  );
+}
+
+function formatTime(iso: string): string {
+  try {
+    const d = new Date(iso);
+    if (Number.isNaN(d.getTime())) return '';
+    return d.toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit' });
+  } catch {
+    return '';
+  }
+}
diff --git a/src/ui/panel.tsx b/src/ui/panel.tsx
new file mode 100644
index 0000000..bc20766
--- /dev/null
+++ b/src/ui/panel.tsx
@@ -0,0 +1,143 @@
+import { h } from 'preact';
+import { useEffect, useRef, useState } from 'preact/hooks';
+import { Message } from './message.js';
+
+type Msg = { id: string; from: 'bot' | 'user'; text: string; at: string };
+
+type PanelProps = {
+  messages: Msg[];
+  typing: boolean;
+  connected: boolean;
+  position?: 'bottom-right' | 'bottom-left';
+  onSend: (text: string) => void;
+  onClose: () => void;
+};
+
+export function Panel({
+  messages,
+  typing,
+  connected,
+  position = 'bottom-right',
+  onSend,
+  onClose,
+}: PanelProps) {
+  const [draft, setDraft] = useState('');
+  const bottomRef = useRef<HTMLDivElement>(null);
+  const inputRef = useRef<HTMLInputElement>(null);
+  const posClass = position === 'bottom-left' ? 'mz-panel--left' : 'mz-panel--right';
+
+  // Auto-scroll to bottom when messages or typing changes
+  useEffect(() => {
+    bottomRef.current?.scrollIntoView({ behavior: 'smooth' });
+  }, [messages, typing]);
+
+  // Focus input when panel opens
+  useEffect(() => {
+    inputRef.current?.focus();
+  }, []);
+
+  function submit() {
+    const text = draft.trim();
+    if (!text) return;
+    setDraft('');
+    onSend(text);
+  }
+
+  function handleKeyDown(e: KeyboardEvent) {
+    if (e.key === 'Enter' && !e.shiftKey) {
+      e.preventDefault();
+      submit();
+    }
+  }
+
+  const canSend = draft.trim().length > 0;
+
+  return (
+    <div class={`messenzy-widget mz-panel ${posClass}`} role="dialog" aria-label="Chat">
+      {/* Header */}
+      <div class="mz-panel__header">
+        <div class="mz-panel__title">
+          <span class={`mz-status-dot${connected ? ' mz-status-dot--online' : ''}`} />
+          Messenzy
+        </div>
+        <button class="mz-close-btn" onClick={onClose} aria-label="Close chat">
+          <CloseIcon />
+        </button>
+      </div>
+
+      {/* Messages */}
+      <div class="mz-messages">
+        {messages.length === 0 && !typing && (
+          <div class="mz-empty">
+            <span class="mz-empty__icon">
+              <EmptyIcon />
+            </span>
+            <p class="mz-empty__text">
+              {connected ? 'Send a message to get started.' : 'Connecting…'}
+            </p>
+          </div>
+        )}
+        {messages.map((m) => (
+          <Message key={m.id} {...m} />
+        ))}
+        {typing && (
+          <div class="mz-typing" aria-label="Bot is typing">
+            <span class="mz-typing__dot" />
+            <span class="mz-typing__dot" />
+            <span class="mz-typing__dot" />
+          </div>
+        )}
+        <div ref={bottomRef} />
+      </div>
+
+      {/* Input bar */}
+      <div class="mz-input-bar">
+        <input
+          ref={inputRef}
+          class="mz-input"
+          type="text"
+          placeholder={connected ? 'Type a message…' : 'Reconnecting…'}
+          disabled={!connected}
+          value={draft}
+          onInput={(e) => setDraft((e.target as HTMLInputElement).value)}
+          onKeyDown={handleKeyDown}
+          maxLength={2000}
+          aria-label="Message input"
+        />
+        <button
+          class="mz-send-btn"
+          disabled={!canSend || !connected}
+          onClick={submit}
+          aria-label="Send message"
+        >
+          <SendIcon />
+        </button>
+      </div>
+    </div>
+  );
+}
+
+function CloseIcon() {
+  return (
+    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" aria-hidden="true">
+      <path d="M14 4L4 14M4 4L14 14" stroke="currentColor" stroke-width="2" stroke-linecap="round" />
+    </svg>
+  );
+}
+
+function SendIcon() {
+  return (
+    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" aria-hidden="true">
+      <path d="M15.5 2.5L8 10M15.5 2.5L10.5 15.5L8 10L2.5 7.5L15.5 2.5Z" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" />
+    </svg>
+  );
+}
+
+function EmptyIcon() {
+  return (
+    <svg width="40" height="40" viewBox="0 0 40 40" fill="none" aria-hidden="true">
+      <rect width="40" height="40" rx="20" fill="currentColor" opacity="0.08" />
+      <path d="M27 12H13C11.9 12 11 12.9 11 14V29L15 25H27C28.1 25 29 24.1 29 23V14C29 12.9 28.1 12 27 12Z" fill="currentColor" opacity="0.4" />
+    </svg>
+  );
+}
diff --git a/src/ui/theme.css b/src/ui/theme.css
new file mode 100644
index 0000000..abde089
--- /dev/null
+++ b/src/ui/theme.css
@@ -0,0 +1,348 @@
+.messenzy-widget {
+  --mz-primary: var(--messenzy-primary, #3b82f6);
+  --mz-accent: var(--messenzy-accent, #ef4444);
+  --mz-bg: #ffffff;
+  --mz-surface: #f9fafb;
+  --mz-text: #111827;
+  --mz-text-muted: #6b7280;
+  --mz-border: #e5e7eb;
+  --mz-radius: 12px;
+  --mz-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
+  --mz-z: 2147483000;
+
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
+    "Helvetica Neue", Arial, sans-serif;
+  font-size: 14px;
+  line-height: 1.5;
+  color: var(--mz-text);
+}
+
+.messenzy-widget * {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+}
+
+/* ── Bubble ─────────────────────────────────────────────────── */
+
+.mz-bubble {
+  position: fixed;
+  bottom: 24px;
+  z-index: var(--mz-z);
+  width: 56px;
+  height: 56px;
+  border-radius: 50%;
+  background: var(--mz-primary);
+  border: none;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
+  transition: transform 0.18s ease, box-shadow 0.18s ease;
+  color: #fff;
+  outline: none;
+}
+
+.mz-bubble:hover {
+  transform: scale(1.08);
+  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.22);
+}
+
+.mz-bubble:active {
+  transform: scale(0.96);
+}
+
+.mz-bubble--right {
+  right: 24px;
+}
+
+.mz-bubble--left {
+  left: 24px;
+}
+
+.mz-bubble__icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: opacity 0.15s ease;
+}
+
+/* ── Panel ──────────────────────────────────────────────────── */
+
+.mz-panel {
+  position: fixed;
+  bottom: 96px;
+  z-index: var(--mz-z);
+  width: 360px;
+  max-width: calc(100vw - 32px);
+  height: 520px;
+  max-height: calc(100vh - 120px);
+  background: var(--mz-bg);
+  border-radius: var(--mz-radius);
+  box-shadow: var(--mz-shadow);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+  animation: mz-panel-in 0.2s ease;
+}
+
+.mz-panel--right {
+  right: 16px;
+}
+
+.mz-panel--left {
+  left: 16px;
+}
+
+@keyframes mz-panel-in {
+  from {
+    opacity: 0;
+    transform: translateY(12px) scale(0.97);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+/* Panel header */
+.mz-panel__header {
+  padding: 14px 16px;
+  background: var(--mz-primary);
+  color: #fff;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  flex-shrink: 0;
+}
+
+.mz-panel__title {
+  font-weight: 600;
+  font-size: 15px;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.mz-status-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  background: rgba(255, 255, 255, 0.45);
+  flex-shrink: 0;
+}
+
+.mz-status-dot--online {
+  background: #4ade80;
+}
+
+.mz-close-btn {
+  background: none;
+  border: none;
+  cursor: pointer;
+  color: rgba(255, 255, 255, 0.8);
+  padding: 4px;
+  display: flex;
+  align-items: center;
+  border-radius: 4px;
+  transition: color 0.15s;
+}
+
+.mz-close-btn:hover {
+  color: #fff;
+}
+
+/* Message list */
+.mz-messages {
+  flex: 1;
+  overflow-y: auto;
+  padding: 16px;
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  scroll-behavior: smooth;
+}
+
+.mz-messages::-webkit-scrollbar {
+  width: 4px;
+}
+
+.mz-messages::-webkit-scrollbar-thumb {
+  background: var(--mz-border);
+  border-radius: 2px;
+}
+
+/* Empty state */
+.mz-empty {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+  color: var(--mz-text-muted);
+  padding: 32px 16px;
+  text-align: center;
+}
+
+.mz-empty__icon {
+  opacity: 0.35;
+}
+
+.mz-empty__text {
+  font-size: 13px;
+}
+
+/* Typing indicator */
+.mz-typing {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  padding: 8px 12px;
+  background: var(--mz-surface);
+  border-radius: 16px 16px 16px 4px;
+  width: fit-content;
+  align-self: flex-start;
+}
+
+.mz-typing__dot {
+  width: 6px;
+  height: 6px;
+  border-radius: 50%;
+  background: var(--mz-text-muted);
+  animation: mz-typing-bounce 1.2s infinite;
+}
+
+.mz-typing__dot:nth-child(2) {
+  animation-delay: 0.2s;
+}
+
+.mz-typing__dot:nth-child(3) {
+  animation-delay: 0.4s;
+}
+
+@keyframes mz-typing-bounce {
+  0%, 60%, 100% {
+    transform: translateY(0);
+    opacity: 0.5;
+  }
+  30% {
+    transform: translateY(-5px);
+    opacity: 1;
+  }
+}
+
+/* Input bar */
+.mz-input-bar {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 12px 16px;
+  border-top: 1px solid var(--mz-border);
+  background: var(--mz-bg);
+  flex-shrink: 0;
+}
+
+.mz-input {
+  flex: 1;
+  border: 1px solid var(--mz-border);
+  border-radius: 24px;
+  padding: 8px 14px;
+  font-size: 14px;
+  font-family: inherit;
+  color: var(--mz-text);
+  background: var(--mz-surface);
+  outline: none;
+  resize: none;
+  transition: border-color 0.15s;
+}
+
+.mz-input:focus {
+  border-color: var(--mz-primary);
+  background: #fff;
+}
+
+.mz-input::placeholder {
+  color: var(--mz-text-muted);
+}
+
+.mz-input:disabled {
+  opacity: 0.55;
+  cursor: not-allowed;
+}
+
+.mz-send-btn {
+  width: 36px;
+  height: 36px;
+  border-radius: 50%;
+  background: var(--mz-primary);
+  border: none;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #fff;
+  flex-shrink: 0;
+  transition: opacity 0.15s, transform 0.1s;
+}
+
+.mz-send-btn:hover:not(:disabled) {
+  opacity: 0.88;
+}
+
+.mz-send-btn:active:not(:disabled) {
+  transform: scale(0.94);
+}
+
+.mz-send-btn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
+
+/* ── Message ────────────────────────────────────────────────── */
+
+.mz-msg {
+  display: flex;
+  flex-direction: column;
+  max-width: 78%;
+}
+
+.mz-msg--user {
+  align-self: flex-end;
+  align-items: flex-end;
+}
+
+.mz-msg--bot {
+  align-self: flex-start;
+  align-items: flex-start;
+}
+
+.mz-msg__bubble {
+  padding: 9px 14px;
+  border-radius: 18px;
+  font-size: 14px;
+  line-height: 1.45;
+  white-space: pre-wrap;
+  word-break: break-word;
+}
+
+.mz-msg--user .mz-msg__bubble {
+  background: var(--mz-primary);
+  color: #fff;
+  border-bottom-right-radius: 4px;
+}
+
+.mz-msg--bot .mz-msg__bubble {
+  background: var(--mz-surface);
+  color: var(--mz-text);
+  border-bottom-left-radius: 4px;
+  border: 1px solid var(--mz-border);
+}
+
+.mz-msg__time {
+  font-size: 11px;
+  color: var(--mz-text-muted);
+  margin-top: 3px;
+  padding: 0 2px;
+}
diff --git a/src/ui/widget.tsx b/src/ui/widget.tsx
new file mode 100644
index 0000000..dda19dc
--- /dev/null
+++ b/src/ui/widget.tsx
@@ -0,0 +1,77 @@
+import { h, Fragment } from 'preact';
+import { useState, useEffect, useRef } from 'preact/hooks';
+import { Bubble } from './bubble.js';
+import { Panel } from './panel.js';
+import {
+  createTransport,
+  type Transport,
+  type WsMessage,
+} from '../transport/ws-client.js';
+import { getVisitorId } from '../storage/visitor.js';
+import type { WidgetConfig } from '../config.js';
+
+type Message = { id: string; from: 'bot' | 'user'; text: string; at: string };
+
+export function Widget({ config }: { config: WidgetConfig }) {
+  const [isOpen, setIsOpen] = useState(false);
+  const [messages, setMessages] = useState<Message[]>([]);
+  const [typing, setTyping] = useState(false);
+  const [connected, setConnected] = useState(false);
+  const visitorId = useRef(getVisitorId()).current;
+  const transportRef = useRef<Transport | null>(null);
+
+  useEffect(() => {
+    const t = createTransport({
+      botId: config.botId,
+      apiKey: config.apiKey,
+      visitorId,
+      serverUrl: config.serverUrl,
+      onConnectionChange: setConnected,
+      onMessage: (msg: WsMessage) => {
+        if (msg.type === 'history') {
+          setMessages(msg.messages);
+        } else if (msg.type === 'bot_message') {
+          setMessages((m) => [
+            ...m,
+            { id: msg.id, from: 'bot', text: msg.text, at: msg.created_at },
+          ]);
+        } else if (msg.type === 'typing') {
+          setTyping(msg.state === 'on');
+        }
+      },
+    });
+    transportRef.current = t;
+    return () => t.close();
+    // config fields are stable after mount — intentionally omit from deps
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  const send = (text: string) => {
+    const id = crypto.randomUUID();
+    setMessages((m) => [
+      ...m,
+      { id, from: 'user', text, at: new Date().toISOString() },
+    ]);
+    transportRef.current?.send({ type: 'user_message', id, text });
+  };
+
+  return (
+    <Fragment>
+      {isOpen && (
+        <Panel
+          messages={messages}
+          typing={typing}
+          connected={connected}
+          position={config.position ?? 'bottom-right'}
+          onSend={send}
+          onClose={() => setIsOpen(false)}
+        />
+      )}
+      <Bubble
+        open={isOpen}
+        position={config.position ?? 'bottom-right'}
+        onClick={() => setIsOpen((v) => !v)}
+      />
+    </Fragment>
+  );
+}
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
new file mode 100644
index 0000000..09ce23e
--- /dev/null
+++ b/src/vite-env.d.ts
@@ -0,0 +1,6 @@
+/// <reference types="vite/client" />
+
+declare module '*.css?inline' {
+  const content: string;
+  export default content;
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..042a98b
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "jsx": "react-jsx",
+    "jsxImportSource": "preact",
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "exactOptionalPropertyTypes": true,
+    "skipLibCheck": true,
+    "declaration": true,
+    "declarationDir": "./dist/types",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/tsconfig.node.json b/tsconfig.node.json
new file mode 100644
index 0000000..cd702cb
--- /dev/null
+++ b/tsconfig.node.json
@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "skipLibCheck": true
+  },
+  "include": ["vite.config.ts"]
+}
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..e4b13a9
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,31 @@
+import { defineConfig } from 'vite';
+import { resolve } from 'path';
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      react: 'preact/compat',
+      'react-dom': 'preact/compat',
+      'react-dom/test-utils': 'preact/test-utils',
+      'react/jsx-runtime': 'preact/jsx-runtime',
+    },
+  },
+  build: {
+    lib: {
+      entry: resolve(__dirname, 'src/index.ts'),
+      name: 'MeszenzyWidget',
+      formats: ['iife', 'es'],
+      fileName: (format) =>
+        format === 'iife' ? 'messenzy-widget.iife.js' : 'messenzy-widget.js',
+    },
+    rollupOptions: {
+      output: {
+        inlineDynamicImports: true,
+      },
+    },
+    cssCodeSplit: false,
+    minify: 'esbuild',
+    sourcemap: false,
+    target: 'es2022',
+  },
+});