diff --git a/api/package-lock.json b/api/package-lock.json
index 0522dd7..a9fa71c 100644
--- a/api/package-lock.json
+++ b/api/package-lock.json
@@ -386,6 +386,7 @@
       "integrity": "sha512-2BCOP7TN8M+gVDj7/ht3hsaO/B/n5oDbiAyyvnRlNOs+u1o+JWNYTQrmpuNp1/Wq2gcFrI01JAW+paEKDMx/CA==",
       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.3",
@@ -1701,6 +1702,7 @@
         }
       ],
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.8.9",
         "caniuse-lite": "^1.0.30001746",
diff --git a/api/src/DIContainer.ts b/api/src/DIContainer.ts
index 171d97e..21eabbf 100644
--- a/api/src/DIContainer.ts
+++ b/api/src/DIContainer.ts
@@ -1,19 +1,110 @@
-import { CosmosClient, Database, Container } from '@azure/cosmos';
-import { SecretClient } from '@azure/keyvault-secrets';
-import { DefaultAzureCredential } from '@azure/identity';
-
-export interface ServiceContainer {
-  cosmosClient: CosmosClient;
-  database: Database;
-  donationsContainer: Container;
-  volunteersContainer: Container;
-  programsContainer: Container;
-  secretClient: SecretClient;
-}
-
-class DIContainer {
-  private static instance: DIContainer;
-  private services: ServiceContainer | null = null;
+import { promises as fs } from 'node:fs';
+import path from 'node:path';
+import { CosmosClient } from '@azure/cosmos';
+import { SecretClient } from '@azure/keyvault-secrets';
+import { DefaultAzureCredential } from '@azure/identity';
+import type { Donation } from './types';
+
+export interface ServiceContainer {
+  donationsContainer: DonationContainerLike;
+  volunteersContainer: DonationContainerLike;
+  programsContainer: DonationContainerLike;
+  secretClient: SecretClientLike;
+}
+
+type QueryParameter = { name: string; value: string };
+
+type DonationQuerySpec = {
+  query: string;
+  parameters?: QueryParameter[];
+};
+
+type DonationContainerLike = {
+  items: {
+    create(item: Donation): Promise<void>;
+    query(spec: DonationQuerySpec): {
+      fetchAll(): Promise<{ resources: Donation[] }>;
+    };
+  };
+};
+
+type SecretClientLike = {
+  getSecret(name: string): Promise<{ value?: string }>;
+};
+
+class EnvSecretClient implements SecretClientLike {
+  public async getSecret(name: string): Promise<{ value?: string }> {
+    const envName = name.toUpperCase().replace(/-/g, '_');
+    return { value: process.env[envName] };
+  }
+}
+
+class FileBackedContainer implements DonationContainerLike {
+  private readonly filePath: string;
+
+  public constructor(collectionName: string) {
+    const dataDir = process.env.MIM_DATA_DIR || path.resolve(process.cwd(), 'data');
+    this.filePath = path.join(dataDir, `${collectionName}.json`);
+  }
+
+  public items = {
+    create: async (item: Donation): Promise<void> => {
+      const items = await this.readAll();
+      items.push(item);
+      await this.writeAll(items);
+    },
+    query: (spec: DonationQuerySpec) => ({
+      fetchAll: async (): Promise<{ resources: Donation[] }> => {
+        let items = await this.readAll();
+        const status = spec.parameters?.find((parameter) => parameter.name === '@status')?.value;
+        const program = spec.parameters?.find((parameter) => parameter.name === '@program')?.value;
+
+        if (status) {
+          items = items.filter((item) => item.status === status);
+        }
+
+        if (program) {
+          items = items.filter((item) => item.program === program);
+        }
+
+        items.sort((left, right) => right.createdAt.localeCompare(left.createdAt));
+        return { resources: items };
+      }
+    })
+  };
+
+  private async ensureFile(): Promise<void> {
+    await fs.mkdir(path.dirname(this.filePath), { recursive: true });
+
+    try {
+      await fs.access(this.filePath);
+    } catch {
+      await fs.writeFile(this.filePath, '[]\n', 'utf8');
+    }
+  }
+
+  private async readAll(): Promise<Donation[]> {
+    await this.ensureFile();
+    const raw = await fs.readFile(this.filePath, 'utf8');
+
+    if (!raw.trim()) {
+      return [];
+    }
+
+    return JSON.parse(raw) as Donation[];
+  }
+
+  private async writeAll(items: Donation[]): Promise<void> {
+    await this.ensureFile();
+    const tempPath = `${this.filePath}.tmp`;
+    await fs.writeFile(tempPath, `${JSON.stringify(items, null, 2)}\n`, 'utf8');
+    await fs.rename(tempPath, this.filePath);
+  }
+}
+
+class DIContainer {
+  private static instance: DIContainer;
+  private services: ServiceContainer | null = null;
 
   private constructor() {}
 
@@ -24,50 +115,51 @@ class DIContainer {
     return DIContainer.instance;
   }
 
-  public async initializeServices(): Promise<ServiceContainer> {
-    if (this.services) {
-      return this.services;
-    }
-
-    try {
-      // Initialize Cosmos DB
-      const cosmosConnectionString = process.env.COSMOS_CONNECTION_STRING;
-      if (!cosmosConnectionString) {
-        throw new Error('COSMOS_CONNECTION_STRING is not configured');
-      }
-
-      const cosmosClient = new CosmosClient(cosmosConnectionString);
-      const databaseName = process.env.COSMOS_DATABASE_NAME || 'MiraclesInMotion';
-      const database = cosmosClient.database(databaseName);
-
-      // Get containers
-      const donationsContainer = database.container('donations');
-      const volunteersContainer = database.container('volunteers');
-      const programsContainer = database.container('programs');
-
-      // Initialize Key Vault
-      const keyVaultUrl = process.env.KEY_VAULT_URL;
-      if (!keyVaultUrl) {
-        throw new Error('KEY_VAULT_URL is not configured');
-      }
-
-      const credential = new DefaultAzureCredential();
-      const secretClient = new SecretClient(keyVaultUrl, credential);
-
-      this.services = {
-        cosmosClient,
-        database,
-        donationsContainer,
-        volunteersContainer,
-        programsContainer,
-        secretClient
-      };
-
-      console.log('✅ Services initialized successfully');
-      return this.services;
-    } catch (error) {
-      console.error('❌ Failed to initialize services:', error);
-      throw error;
+  public async initializeServices(): Promise<ServiceContainer> {
+    if (this.services) {
+      return this.services;
+    }
+
+    try {
+      const cosmosConnectionString = process.env.COSMOS_CONNECTION_STRING;
+      const keyVaultUrl = process.env.KEY_VAULT_URL;
+
+      let donationsContainer: DonationContainerLike;
+      let volunteersContainer: DonationContainerLike;
+      let programsContainer: DonationContainerLike;
+
+      if (cosmosConnectionString) {
+        const cosmosClient = new CosmosClient(cosmosConnectionString);
+        const databaseName = process.env.COSMOS_DATABASE_NAME || 'MiraclesInMotion';
+        const database = cosmosClient.database(databaseName);
+
+        donationsContainer = database.container('donations') as unknown as DonationContainerLike;
+        volunteersContainer = database.container('volunteers') as unknown as DonationContainerLike;
+        programsContainer = database.container('programs') as unknown as DonationContainerLike;
+      } else {
+        donationsContainer = new FileBackedContainer('donations');
+        volunteersContainer = new FileBackedContainer('volunteers');
+        programsContainer = new FileBackedContainer('programs');
+      }
+
+      const secretClient = keyVaultUrl
+        ? new SecretClient(keyVaultUrl, new DefaultAzureCredential())
+        : new EnvSecretClient();
+
+      this.services = {
+        donationsContainer,
+        volunteersContainer,
+        programsContainer,
+        secretClient
+      };
+
+      console.log(
+        `Services initialized successfully (${cosmosConnectionString ? 'cosmos' : 'local-file'} storage, ${keyVaultUrl ? 'key-vault' : 'env'} secrets)`
+      );
+      return this.services;
+    } catch (error) {
+      console.error('❌ Failed to initialize services:', error);
+      throw error;
     }
   }
 
@@ -79,4 +171,4 @@ class DIContainer {
   }
 }
 
-export default DIContainer;
\ No newline at end of file
+export default DIContainer;
diff --git a/api/src/ai/chat.ts b/api/src/ai/chat.ts
new file mode 100644
index 0000000..2dc7fe9
--- /dev/null
+++ b/api/src/ai/chat.ts
@@ -0,0 +1,181 @@
+import { app, HttpRequest, HttpResponseInit, InvocationContext } from '@azure/functions';
+
+const DEFAULT_MODEL = 'grok-3';
+const DEFAULT_BASE_URL = 'https://api.x.ai/v1';
+const MAX_MESSAGES = 10;
+const MAX_MESSAGE_CHARS = 4000;
+
+type ChatRole = 'system' | 'assistant' | 'user';
+
+interface ChatMessage {
+  role: ChatRole;
+  content: string;
+}
+
+interface ChatRequestBody {
+  messages?: ChatMessage[];
+  pageContext?: Record<string, string | undefined>;
+}
+
+interface xAIChatResponse {
+  choices?: Array<{
+    message?: {
+      content?: string;
+    };
+  }>;
+  output_text?: string;
+  output?: Array<{
+    content?: Array<{
+      text?: string;
+    }>;
+  }>;
+}
+
+function jsonResponse(status: number, body: Record<string, unknown>): HttpResponseInit {
+  return {
+    status,
+    jsonBody: body,
+    headers: {
+      'Content-Type': 'application/json',
+      'Access-Control-Allow-Origin': '*',
+      'Access-Control-Allow-Methods': 'POST, OPTIONS',
+      'Access-Control-Allow-Headers': 'Content-Type'
+    }
+  };
+}
+
+function normalizeMessages(messages: ChatMessage[] | undefined): ChatMessage[] {
+  if (!Array.isArray(messages)) {
+    return [];
+  }
+
+  return messages
+    .filter((message): message is ChatMessage => Boolean(message && typeof message === 'object'))
+    .map(message => ({
+      role: message.role,
+      content: String(message.content || '').trim().slice(0, MAX_MESSAGE_CHARS)
+    }))
+    .filter(message => ['assistant', 'user', 'system'].includes(message.role) && message.content.length > 0)
+    .slice(-MAX_MESSAGES);
+}
+
+function buildSystemPrompt(pagePath: string): string {
+  return [
+    'You are the Miracles in Motion website assistant for MIM4U.',
+    'Answer as a warm, concise concierge for a nonprofit that supports students with school supplies, clothing, shoes, emergency support, volunteer coordination, donations, and sponsorships.',
+    'Use only the provided context and the user messages. If you are unsure, say so and direct the user to info@miraclesinmotion.org.',
+    'Keep replies practical and short. Prefer bullets only when they improve clarity.',
+    'When relevant, guide users to these routes: #/donate, #/volunteers, #/request-assistance, #/impact, #/stories.',
+    'Do not invent phone numbers, addresses, office hours, eligibility rules, or application steps.',
+    'If someone needs urgent support, tell them to use #/request-assistance and contact info@miraclesinmotion.org directly.',
+    `Current page route: ${pagePath || '/'}`
+  ].join('\n');
+}
+
+function extractReply(payload: xAIChatResponse): string {
+  const choiceReply = payload.choices?.[0]?.message?.content?.trim();
+  if (choiceReply) {
+    return choiceReply;
+  }
+
+  const outputText = payload.output_text?.trim();
+  if (outputText) {
+    return outputText;
+  }
+
+  const outputReply = payload.output
+    ?.flatMap(item => item.content ?? [])
+    .map(item => item.text?.trim() ?? '')
+    .filter(Boolean)
+    .join('\n')
+    .trim();
+
+  return outputReply || '';
+}
+
+export async function chatWithAssistant(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
+  if (request.method === 'OPTIONS') {
+    return jsonResponse(200, { ok: true });
+  }
+
+  const apiKey = process.env.XAI_API_KEY?.trim();
+  if (!apiKey) {
+    return jsonResponse(503, {
+      success: false,
+      error: 'Assistant is not configured on the server.',
+      timestamp: new Date().toISOString()
+    });
+  }
+
+  try {
+    const body = await request.json() as ChatRequestBody;
+    const messages = normalizeMessages(body.messages);
+    if (messages.length === 0) {
+      return jsonResponse(400, {
+        success: false,
+        error: 'At least one message is required.',
+        timestamp: new Date().toISOString()
+      });
+    }
+
+    const pagePath = body.pageContext?.path || '/';
+    const model = process.env.XAI_MODEL?.trim() || process.env.EXPLORER_AI_MODEL?.trim() || DEFAULT_MODEL;
+    const baseUrl = (process.env.XAI_BASE_URL?.trim() || DEFAULT_BASE_URL).replace(/\/+$/, '');
+
+    const upstreamResponse = await fetch(`${baseUrl}/chat/completions`, {
+      method: 'POST',
+      headers: {
+        'Authorization': `Bearer ${apiKey}`,
+        'Content-Type': 'application/json'
+      },
+      body: JSON.stringify({
+        model,
+        stream: false,
+        messages: [
+          { role: 'system', content: buildSystemPrompt(pagePath) },
+          ...messages
+        ]
+      })
+    });
+
+    const payload = await upstreamResponse.json() as xAIChatResponse;
+    if (!upstreamResponse.ok) {
+      context.error('xAI upstream returned an error', upstreamResponse.status, payload);
+      return jsonResponse(502, {
+        success: false,
+        error: 'Assistant upstream request failed.',
+        timestamp: new Date().toISOString()
+      });
+    }
+
+    const reply = extractReply(payload);
+    if (!reply) {
+      return jsonResponse(502, {
+        success: false,
+        error: 'Assistant returned an empty response.',
+        timestamp: new Date().toISOString()
+      });
+    }
+
+    return jsonResponse(200, {
+      success: true,
+      reply,
+      model,
+      timestamp: new Date().toISOString()
+    });
+  } catch (error) {
+    context.error('Error in ai chat handler:', error);
+    return jsonResponse(500, {
+      success: false,
+      error: 'Assistant request failed.',
+      timestamp: new Date().toISOString()
+    });
+  }
+}
+
+app.http('chatWithAssistant', {
+  methods: ['POST', 'OPTIONS'],
+  authLevel: 'anonymous',
+  route: 'ai/chat',
+  handler: chatWithAssistant
+});
diff --git a/api/src/donations/createDonation.ts b/api/src/donations/createDonation.ts
index 2a45fd3..202bc5a 100644
--- a/api/src/donations/createDonation.ts
+++ b/api/src/donations/createDonation.ts
@@ -31,13 +31,17 @@ export async function createDonation(request: HttpRequest, context: InvocationCo
     }
 
     // Initialize Stripe if payment method is stripe
-    let stripePaymentIntentId: string | undefined;
-    if (donationRequest.paymentMethod === 'stripe') {
-      try {
-        const stripeSecretKey = await secretClient.getSecret('stripe-secret-key');
-        const stripe = new Stripe(stripeSecretKey.value!, {
-          apiVersion: '2025-02-24.acacia'
-        });
+    let stripePaymentIntentId: string | undefined;
+    if (donationRequest.paymentMethod === 'stripe') {
+      try {
+        const stripeSecretKey = await secretClient.getSecret('stripe-secret-key');
+        if (!stripeSecretKey.value) {
+          throw new Error('stripe-secret-key is not configured');
+        }
+
+        const stripe = new Stripe(stripeSecretKey.value!, {
+          apiVersion: '2025-02-24.acacia'
+        });
 
         const paymentIntent = await stripe.paymentIntents.create({
           amount: Math.round(donationRequest.amount * 100), // Convert to cents
@@ -89,8 +93,8 @@ export async function createDonation(request: HttpRequest, context: InvocationCo
       updatedAt: new Date().toISOString()
     };
 
-    // Save to Cosmos DB
-    await donationsContainer.items.create(donation);
+    // Persist the donation using the active backend.
+    await donationsContainer.items.create(donation);
 
     const response: ApiResponse<Donation> = {
       success: true,
@@ -132,4 +136,4 @@ app.http('createDonation', {
   authLevel: 'anonymous',
   route: 'donations',
   handler: createDonation
-});
\ No newline at end of file
+});
diff --git a/api/src/index.ts b/api/src/index.ts
new file mode 100644
index 0000000..81e45e9
--- /dev/null
+++ b/api/src/index.ts
@@ -0,0 +1,3 @@
+import './donations/createDonation';
+import './donations/getDonations';
+import './ai/chat';
diff --git a/src/App.tsx b/src/App.tsx
index b4d6f4d..f6f9d55 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -58,9 +58,10 @@ import {
 import AIAssistancePortal from './components/AIAssistancePortal'
 
 // Phase 3B: Enterprise Components
-import AdvancedAnalyticsDashboard from './components/AdvancedAnalyticsDashboard'
-import MobileVolunteerApp from './components/MobileVolunteerApp'
-import StaffTrainingDashboard from './components/StaffTrainingDashboard'
+import AdvancedAnalyticsDashboard from './components/AdvancedAnalyticsDashboard'
+import MobileVolunteerApp from './components/MobileVolunteerApp'
+import StaffTrainingDashboard from './components/StaffTrainingDashboard'
+import MimChatAgent from './components/MimChatAgent'
 
 // Phase 4: Extracted Components
 import { Navigation } from './components/Navigation'
@@ -4602,9 +4603,9 @@ function AppContent() {
     }
   }
 
-  return (
-    <div className={`min-h-screen transition-colors duration-300 bg-neutral-50 text-neutral-900 antialiased selection:bg-primary-200/60 dark:bg-neutral-950 dark:text-neutral-50 ${darkMode ? 'dark' : ''}`}>
-      <BackgroundDecor />
+  return (
+    <div className={`min-h-screen transition-colors duration-300 bg-neutral-50 text-neutral-900 antialiased selection:bg-primary-200/60 dark:bg-neutral-950 dark:text-neutral-50 ${darkMode ? 'dark' : ''}`}>
+      <BackgroundDecor />
       <SkipToContent />
       
       {/* Offline Indicator */}
@@ -4627,10 +4628,20 @@ function AppContent() {
       <main id="content" className="relative flex-1">
         {renderPage()}
       </main>
-      
-      <Footer />
-      <StickyDonate />
-      <CookieBanner />
-    </div>
-  )
-}
\ No newline at end of file
+      
+      <Footer />
+      {![
+        '/admin-portal',
+        '/volunteer-portal',
+        '/resource-portal',
+        '/analytics',
+        '/ai-portal',
+        '/advanced-analytics',
+        '/mobile-volunteer',
+        '/staff-training'
+      ].includes(currentPath) && <MimChatAgent currentPath={currentPath} />}
+      <StickyDonate />
+      <CookieBanner />
+    </div>
+  )
+}
diff --git a/src/components/MimChatAgent.tsx b/src/components/MimChatAgent.tsx
new file mode 100644
index 0000000..9cff24e
--- /dev/null
+++ b/src/components/MimChatAgent.tsx
@@ -0,0 +1,290 @@
+import { FormEvent, useEffect, useMemo, useRef, useState } from 'react'
+import { AnimatePresence, motion } from 'framer-motion'
+import { Bot, MessageCircle, Send, Sparkles, X } from 'lucide-react'
+
+type ChatRole = 'system' | 'assistant' | 'user'
+
+interface ChatMessage {
+  id: string
+  role: Exclude<ChatRole, 'system'>
+  content: string
+}
+
+interface BackendChatResponse {
+  reply?: string
+  error?: string
+  model?: string
+}
+
+const CHAT_ENABLED = import.meta.env.VITE_ENABLE_CHAT === 'true'
+const CHAT_API_BASE_URL = (import.meta.env.VITE_CHAT_API_BASE_URL?.trim() || '').replace(/\/+$/, '')
+const CONTACT_EMAIL = import.meta.env.VITE_CONTACT_EMAIL?.trim() || 'info@miraclesinmotion.org'
+
+const SUGGESTIONS = [
+  'How do I request help with school supplies?',
+  'What kinds of clothing assistance do you offer?',
+  'How can I donate or volunteer today?',
+  'What emergency support is available for students?'
+]
+
+const INITIAL_MESSAGE: ChatMessage = {
+  id: 'welcome',
+  role: 'assistant',
+  content: `Hi, I’m the Miracles in Motion assistant. I can help you find programs, request support, donate, or volunteer. If something needs human follow-up, I’ll point you to ${CONTACT_EMAIL}.`
+}
+
+function buildMessages(history: ChatMessage[]): Array<{ role: ChatRole; content: string }> {
+  return history.slice(-8).map(message => ({
+    role: message.role,
+    content: message.content
+  }))
+}
+
+interface MimChatAgentProps {
+  currentPath: string
+}
+
+export default function MimChatAgent({ currentPath }: MimChatAgentProps) {
+  const [isOpen, setIsOpen] = useState(false)
+  const [input, setInput] = useState('')
+  const [messages, setMessages] = useState<ChatMessage[]>([INITIAL_MESSAGE])
+  const [isSending, setIsSending] = useState(false)
+  const [errorMessage, setErrorMessage] = useState<string | null>(null)
+  const bodyRef = useRef<HTMLDivElement | null>(null)
+
+  const isConfigured = CHAT_ENABLED
+  const hasConversation = messages.length > 1
+  const chatEndpoint = `${CHAT_API_BASE_URL}/api/ai/chat`
+
+  const quickSuggestions = useMemo(
+    () => (hasConversation ? SUGGESTIONS.slice(0, 2) : SUGGESTIONS),
+    [hasConversation]
+  )
+
+  useEffect(() => {
+    if (!bodyRef.current) {
+      return
+    }
+
+    bodyRef.current.scrollTop = bodyRef.current.scrollHeight
+  }, [messages, isOpen])
+
+  if (!isConfigured) {
+    return null
+  }
+
+  const handleSubmit = async (event?: FormEvent<HTMLFormElement>, presetPrompt?: string) => {
+    event?.preventDefault()
+
+    const prompt = (presetPrompt ?? input).trim()
+    if (!prompt || isSending) {
+      return
+    }
+
+    const userMessage: ChatMessage = {
+      id: `user-${Date.now()}`,
+      role: 'user',
+      content: prompt
+    }
+
+    const nextMessages = [...messages, userMessage]
+    setMessages(nextMessages)
+    setInput('')
+    setIsSending(true)
+    setErrorMessage(null)
+
+    try {
+      const response = await fetch(chatEndpoint, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json'
+        },
+        body: JSON.stringify({
+          messages: buildMessages(nextMessages),
+          pageContext: {
+            path: currentPath
+          }
+        })
+      })
+
+      if (!response.ok) {
+        throw new Error(`xAI returned ${response.status}`)
+      }
+
+      const payload = (await response.json()) as BackendChatResponse
+      const assistantReply = payload.reply?.trim() || "I couldn't generate a response just now. Please try again."
+
+      setMessages(prev => [
+        ...prev,
+        {
+          id: `assistant-${Date.now()}`,
+          role: 'assistant',
+          content: assistantReply
+        }
+      ])
+    } catch (error) {
+      console.error('MIM chat request failed:', error)
+      const fallback = `I’m having trouble reaching the assistant right now. Please try again in a moment, or email ${CONTACT_EMAIL} for help.`
+      setErrorMessage(fallback)
+      setMessages(prev => [
+        ...prev,
+        {
+          id: `assistant-error-${Date.now()}`,
+          role: 'assistant',
+          content: fallback
+        }
+      ])
+    } finally {
+      setIsSending(false)
+    }
+  }
+
+  const resetConversation = () => {
+    setMessages([INITIAL_MESSAGE])
+    setInput('')
+    setErrorMessage(null)
+  }
+
+  return (
+    <div className="fixed bottom-5 right-5 z-[70] flex max-w-[calc(100vw-2rem)] flex-col items-end gap-3 sm:bottom-6 sm:right-6">
+      <AnimatePresence>
+        {isOpen && (
+          <motion.section
+            id="mim-chat-agent-panel"
+            initial={{ opacity: 0, y: 18, scale: 0.96 }}
+            animate={{ opacity: 1, y: 0, scale: 1 }}
+            exit={{ opacity: 0, y: 12, scale: 0.96 }}
+            transition={{ duration: 0.18 }}
+            className="w-[min(24rem,calc(100vw-2rem))] overflow-hidden rounded-[1.75rem] border border-white/60 bg-white/92 shadow-[0_24px_80px_rgba(219,39,119,0.22)] backdrop-blur-xl dark:border-white/10 dark:bg-neutral-950/92"
+            aria-label="Miracles in Motion AI chat assistant"
+          >
+            <div className="bg-gradient-to-r from-primary-600 via-pink-500 to-fuchsia-500 px-4 py-4 text-white">
+              <div className="flex items-start justify-between gap-3">
+                <div className="min-w-0">
+                  <div className="flex items-center gap-2 text-sm font-semibold uppercase tracking-[0.2em] text-white/80">
+                    <Sparkles className="h-4 w-4" />
+                    MIM Assistant
+                  </div>
+                  <h2 className="mt-1 text-lg font-semibold">Ask Miracles in Motion</h2>
+                  <p className="mt-1 text-sm text-white/85">
+                    Program guidance, donation help, and quick next steps.
+                  </p>
+                </div>
+                <button
+                  type="button"
+                  onClick={() => setIsOpen(false)}
+                  className="rounded-full border border-white/25 bg-white/10 p-2 text-white transition hover:bg-white/20"
+                  aria-label="Close chat assistant"
+                >
+                  <X className="h-4 w-4" />
+                </button>
+              </div>
+            </div>
+
+            <div ref={bodyRef} className="max-h-[26rem] space-y-4 overflow-y-auto px-4 py-4">
+              {messages.map(message => (
+                <div
+                  key={message.id}
+                  className={`flex ${message.role === 'user' ? 'justify-end' : 'justify-start'}`}
+                >
+                  <div
+                    className={`max-w-[85%] rounded-2xl px-4 py-3 text-sm leading-6 shadow-sm ${
+                      message.role === 'user'
+                        ? 'rounded-br-md bg-neutral-900 text-white dark:bg-white dark:text-neutral-900'
+                        : 'rounded-bl-md bg-pink-50 text-neutral-800 dark:bg-neutral-900 dark:text-neutral-100'
+                    }`}
+                  >
+                    {message.content}
+                  </div>
+                </div>
+              ))}
+
+              {isSending && (
+                <div className="flex justify-start">
+                  <div className="rounded-2xl rounded-bl-md bg-pink-50 px-4 py-3 text-sm text-neutral-700 dark:bg-neutral-900 dark:text-neutral-200">
+                    Thinking...
+                  </div>
+                </div>
+              )}
+
+              {!hasConversation && (
+                <div className="flex flex-wrap gap-2">
+                  {quickSuggestions.map(suggestion => (
+                    <button
+                      key={suggestion}
+                      type="button"
+                      onClick={() => void handleSubmit(undefined, suggestion)}
+                      className="rounded-full border border-pink-200 bg-white px-3 py-2 text-left text-xs font-medium text-neutral-700 transition hover:border-pink-300 hover:bg-pink-50 dark:border-white/10 dark:bg-neutral-950 dark:text-neutral-200 dark:hover:bg-neutral-900"
+                    >
+                      {suggestion}
+                    </button>
+                  ))}
+                </div>
+              )}
+            </div>
+
+            <div className="border-t border-neutral-200/80 px-4 py-4 dark:border-white/10">
+              <form onSubmit={event => void handleSubmit(event)} className="space-y-3">
+                <div className="flex items-end gap-2">
+                  <textarea
+                    value={input}
+                    onChange={event => setInput(event.target.value)}
+                    rows={2}
+                    placeholder="Ask about programs, requests, donations, or volunteering..."
+                    className="min-h-[3.25rem] flex-1 resize-none rounded-2xl border border-neutral-200 bg-white px-4 py-3 text-sm text-neutral-900 outline-none transition focus:border-pink-400 focus:ring-2 focus:ring-pink-200 dark:border-white/10 dark:bg-neutral-950 dark:text-white dark:focus:border-pink-500 dark:focus:ring-pink-500/20"
+                  />
+                  <button
+                    type="submit"
+                    disabled={!input.trim() || isSending}
+                    className="inline-flex h-12 w-12 items-center justify-center rounded-2xl bg-gradient-to-r from-primary-600 to-pink-500 text-white shadow-lg transition hover:scale-[1.02] disabled:cursor-not-allowed disabled:opacity-60"
+                    aria-label="Send message"
+                  >
+                    <Send className="h-4 w-4" />
+                  </button>
+                </div>
+
+                <div className="flex items-center justify-between gap-3">
+                  <p className="text-xs text-neutral-500 dark:text-neutral-400">
+                    AI can help you navigate the site, but humans can help at {CONTACT_EMAIL}.
+                  </p>
+                  <button
+                    type="button"
+                    onClick={resetConversation}
+                    className="text-xs font-medium text-pink-600 transition hover:text-pink-700 dark:text-pink-400 dark:hover:text-pink-300"
+                  >
+                    Clear
+                  </button>
+                </div>
+              </form>
+
+              {errorMessage && (
+                <p className="mt-2 text-xs text-amber-600 dark:text-amber-400">
+                  {errorMessage}
+                </p>
+              )}
+            </div>
+          </motion.section>
+        )}
+      </AnimatePresence>
+
+      <motion.button
+        type="button"
+        onClick={() => setIsOpen(open => !open)}
+        whileHover={{ scale: 1.03 }}
+        whileTap={{ scale: 0.98 }}
+        className="group inline-flex items-center gap-3 rounded-full border border-white/50 bg-neutral-950 px-4 py-3 text-sm font-semibold text-white shadow-[0_18px_55px_rgba(17,24,39,0.3)] transition hover:bg-neutral-900 dark:border-white/10"
+        aria-expanded={isOpen}
+        aria-controls="mim-chat-agent-panel"
+      >
+        <span className="inline-flex h-11 w-11 items-center justify-center rounded-full bg-gradient-to-r from-primary-600 to-pink-500 text-white shadow-inner">
+          {isOpen ? <X className="h-5 w-5" /> : <MessageCircle className="h-5 w-5" />}
+        </span>
+        <span className="hidden sm:flex sm:flex-col sm:items-start sm:leading-tight">
+          <span>Need help?</span>
+          <span className="text-xs font-normal text-white/70">Chat with MIM Assistant</span>
+        </span>
+        <Bot className="hidden h-4 w-4 text-white/60 sm:block" />
+      </motion.button>
+    </div>
+  )
+}
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
new file mode 100644
index 0000000..57a4451
--- /dev/null
+++ b/src/vite-env.d.ts
@@ -0,0 +1,11 @@
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_ENABLE_CHAT?: string
+  readonly VITE_CHAT_API_BASE_URL?: string
+  readonly VITE_CONTACT_EMAIL?: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}