diff --git a/app/Http/Controllers/Seller/ChatController.php b/app/Http/Controllers/Seller/ChatController.php
new file mode 100644
index 00000000..02c266c3
--- /dev/null
+++ b/app/Http/Controllers/Seller/ChatController.php
@@ -0,0 +1,415 @@
+<?php
+
+namespace App\Http\Controllers\Seller;
+
+use App\Http\Controllers\Controller;
+use App\Models\Business;
+use App\Models\Crm\CrmActiveView;
+use App\Models\Crm\CrmChannel;
+use App\Models\Crm\CrmInternalNote;
+use App\Models\Crm\CrmThread;
+use App\Models\User;
+use App\Services\Crm\CrmAiService;
+use App\Services\Crm\CrmChannelService;
+use App\Services\Crm\CrmSlaService;
+use Illuminate\Http\Request;
+
+class ChatController extends Controller
+{
+    public function __construct(
+        protected CrmChannelService $channelService,
+        protected CrmSlaService $slaService,
+        protected CrmAiService $aiService
+    ) {}
+
+    /**
+     * Unified chat inbox view (Chatwoot-style)
+     */
+    public function index(Request $request, Business $business)
+    {
+        $query = CrmThread::forBusiness($business->id)
+            ->with(['contact', 'assignee', 'brand', 'channel', 'messages' => fn ($q) => $q->latest()->limit(1)])
+            ->withCount('messages');
+
+        // Filters
+        if ($request->filled('status')) {
+            $query->where('status', $request->status);
+        }
+
+        if ($request->filled('assigned_to')) {
+            if ($request->assigned_to === 'unassigned') {
+                $query->unassigned();
+            } else {
+                $query->assignedTo($request->assigned_to);
+            }
+        }
+
+        if ($request->filled('department')) {
+            $query->forDepartment($request->department);
+        }
+
+        if ($request->filled('brand_id')) {
+            $query->forBrand($request->brand_id);
+        }
+
+        if ($request->filled('search')) {
+            $query->where(function ($q) use ($request) {
+                $q->where('subject', 'ilike', "%{$request->search}%")
+                    ->orWhere('last_message_preview', 'ilike', "%{$request->search}%")
+                    ->orWhereHas('contact', fn ($c) => $c->where('name', 'ilike', "%{$request->search}%"));
+            });
+        }
+
+        $threads = $query->orderByDesc('last_message_at')->paginate(50);
+
+        // Get team members for assignment dropdown
+        $teamMembers = User::whereHas('businesses', fn ($q) => $q->where('businesses.id', $business->id))->get();
+
+        // Get available channels
+        $channels = $this->channelService->getAvailableChannels($business->id);
+
+        // Get brands for filter dropdown
+        $brands = \App\Models\Brand::where('business_id', $business->id)
+            ->where('is_active', true)
+            ->orderBy('name')
+            ->get();
+
+        // Get departments for filter dropdown
+        $departments = CrmChannel::DEPARTMENTS;
+
+        // Get contacts for new conversation modal
+        // Include: 1) Customer contacts (from businesses that ordered), 2) Own business contacts (coworkers)
+        $customerBusinessIds = \App\Models\Order::whereHas('items.product.brand', fn ($q) => $q->where('business_id', $business->id))
+            ->pluck('business_id')
+            ->unique();
+
+        // Add the seller's own business ID to include coworkers
+        $allBusinessIds = $customerBusinessIds->push($business->id)->unique();
+
+        $contacts = \App\Models\Contact::whereIn('business_id', $allBusinessIds)
+            ->with('business:id,name')
+            ->orderBy('first_name')
+            ->limit(200)
+            ->get();
+
+        return view('seller.chat.index', compact(
+            'business',
+            'threads',
+            'teamMembers',
+            'channels',
+            'brands',
+            'departments',
+            'contacts'
+        ));
+    }
+
+    /**
+     * API: Get thread data for inline loading
+     */
+    public function getThread(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $thread->load([
+            'contact',
+            'account',
+            'assignee',
+            'brand',
+            'channel',
+            'messages.attachments',
+            'messages.user',
+            'deals',
+            'internalNotes.user',
+            'tags.tag',
+        ]);
+
+        // Mark as read
+        $thread->markAsRead($request->user());
+
+        // Start viewing (collision detection)
+        CrmActiveView::startViewing($thread, $request->user());
+
+        // Get other viewers
+        $otherViewers = CrmActiveView::getActiveViewers($thread, $request->user()->id);
+
+        // Get SLA status
+        $slaStatus = $this->slaService->getThreadSlaStatus($thread);
+
+        // Get AI suggestions
+        $suggestions = $thread->aiSuggestions()->pending()->notExpired()->get();
+
+        // Get available channels for reply
+        $channels = $this->channelService->getAvailableChannels($business->id);
+
+        // Get team members for assignment dropdown
+        $teamMembers = User::whereHas('businesses', fn ($q) => $q->where('businesses.id', $business->id))->get();
+
+        return response()->json([
+            'thread' => $thread,
+            'otherViewers' => $otherViewers->map(fn ($v) => [
+                'id' => $v->user->id,
+                'name' => $v->user->name,
+                'type' => $v->view_type,
+            ]),
+            'slaStatus' => $slaStatus,
+            'suggestions' => $suggestions,
+            'channels' => $channels,
+            'teamMembers' => $teamMembers,
+        ]);
+    }
+
+    /**
+     * API: Send reply in thread
+     */
+    public function reply(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $validated = $request->validate([
+            'body' => 'required|string|max:10000',
+            'channel_type' => 'required|string|in:sms,email,whatsapp,instagram,in_app',
+        ]);
+
+        $contact = $thread->contact;
+        $to = $validated['channel_type'] === CrmChannel::TYPE_EMAIL
+            ? $contact->email
+            : $contact->phone;
+
+        if (! $to) {
+            return response()->json(['error' => 'Contact does not have required contact info for this channel.'], 422);
+        }
+
+        $success = $this->channelService->sendMessage(
+            businessId: $business->id,
+            channelType: $validated['channel_type'],
+            to: $to,
+            body: $validated['body'],
+            subject: null,
+            threadId: $thread->id,
+            contactId: $contact->id,
+            userId: $request->user()->id,
+            attachments: []
+        );
+
+        if (! $success) {
+            return response()->json(['error' => 'Failed to send message.'], 500);
+        }
+
+        // Auto-assign thread to sender if unassigned
+        if ($thread->assigned_to === null) {
+            $thread->assigned_to = $request->user()->id;
+            $thread->save();
+        }
+
+        // Handle SLA
+        $this->slaService->handleOutboundMessage($thread);
+
+        // Reload messages
+        $thread->load(['messages.attachments', 'messages.user']);
+
+        return response()->json([
+            'success' => true,
+            'messages' => $thread->messages,
+        ]);
+    }
+
+    /**
+     * API: Create new thread
+     */
+    public function store(Request $request, Business $business)
+    {
+        $validated = $request->validate([
+            'contact_id' => 'required|exists:contacts,id',
+            'channel_type' => 'required|string|in:sms,email,whatsapp,instagram,in_app',
+            'body' => 'required|string|max:10000',
+        ]);
+
+        // Get allowed business IDs (customers + own business for coworkers)
+        $customerBusinessIds = \App\Models\Order::whereHas('items.product.brand', fn ($q) => $q->where('business_id', $business->id))
+            ->pluck('business_id')
+            ->unique();
+        $allBusinessIds = $customerBusinessIds->push($business->id)->unique();
+
+        // SECURITY: Verify contact belongs to a customer business or own business (coworker)
+        $contact = \App\Models\Contact::whereIn('business_id', $allBusinessIds)
+            ->findOrFail($validated['contact_id']);
+
+        $to = $validated['channel_type'] === CrmChannel::TYPE_EMAIL
+            ? $contact->email
+            : $contact->phone;
+
+        if (! $to) {
+            return response()->json(['error' => 'Contact does not have the required contact info for this channel.'], 422);
+        }
+
+        // Create thread
+        $thread = CrmThread::create([
+            'business_id' => $business->id,
+            'contact_id' => $contact->id,
+            'account_id' => $contact->account_id,
+            'status' => 'open',
+            'priority' => 'normal',
+            'last_channel_type' => $validated['channel_type'],
+            'assigned_to' => $request->user()->id,
+        ]);
+
+        // Send the message
+        $success = $this->channelService->sendMessage(
+            businessId: $business->id,
+            channelType: $validated['channel_type'],
+            to: $to,
+            body: $validated['body'],
+            subject: null,
+            threadId: $thread->id,
+            contactId: $contact->id,
+            userId: $request->user()->id,
+            attachments: []
+        );
+
+        if (! $success) {
+            $thread->delete();
+
+            return response()->json(['error' => 'Failed to send message.'], 500);
+        }
+
+        $thread->load(['contact', 'messages']);
+
+        return response()->json([
+            'success' => true,
+            'thread' => $thread,
+        ]);
+    }
+
+    /**
+     * API: Assign thread
+     */
+    public function assign(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $validated = $request->validate([
+            'assigned_to' => 'nullable|exists:users,id',
+        ]);
+
+        if ($validated['assigned_to']) {
+            $assignee = User::where('id', $validated['assigned_to'])
+                ->whereHas('businesses', fn ($q) => $q->where('businesses.id', $business->id))
+                ->first();
+
+            if (! $assignee) {
+                return response()->json(['error' => 'Invalid user.'], 422);
+            }
+
+            $thread->assignTo($assignee, $request->user());
+        } else {
+            $thread->assigned_to = null;
+            $thread->save();
+        }
+
+        return response()->json(['success' => true]);
+    }
+
+    /**
+     * API: Close thread
+     */
+    public function close(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $thread->close($request->user());
+
+        return response()->json(['success' => true, 'status' => 'closed']);
+    }
+
+    /**
+     * API: Reopen thread
+     */
+    public function reopen(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $thread->reopen($request->user());
+        $this->slaService->resumeTimers($thread);
+
+        return response()->json(['success' => true, 'status' => 'open']);
+    }
+
+    /**
+     * API: Add internal note
+     */
+    public function addNote(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $validated = $request->validate([
+            'content' => 'required|string|max:5000',
+        ]);
+
+        $note = CrmInternalNote::create([
+            'business_id' => $business->id,
+            'user_id' => $request->user()->id,
+            'notable_type' => CrmThread::class,
+            'notable_id' => $thread->id,
+            'content' => $validated['content'],
+        ]);
+
+        $note->load('user');
+
+        return response()->json(['success' => true, 'note' => $note]);
+    }
+
+    /**
+     * API: Generate AI reply
+     */
+    public function generateAiReply(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Not found'], 404);
+        }
+
+        $suggestion = $this->aiService->generateReplyDraft($thread, $request->input('tone', 'professional'));
+
+        if (! $suggestion) {
+            return response()->json(['error' => 'Failed to generate reply.'], 500);
+        }
+
+        return response()->json([
+            'content' => $suggestion->content,
+            'suggestion_id' => $suggestion->id,
+        ]);
+    }
+
+    /**
+     * API: Heartbeat for active viewing
+     */
+    public function heartbeat(Request $request, Business $business, CrmThread $thread)
+    {
+        if ($thread->business_id !== $business->id) {
+            return response()->json(['error' => 'Unauthorized'], 403);
+        }
+
+        CrmActiveView::startViewing($thread, $request->user(), $request->input('view_type', 'viewing'));
+
+        $otherViewers = CrmActiveView::getActiveViewers($thread, $request->user()->id);
+
+        return response()->json([
+            'other_viewers' => $otherViewers->map(fn ($v) => [
+                'id' => $v->user->id,
+                'name' => $v->user->name,
+                'type' => $v->view_type,
+            ]),
+        ]);
+    }
+}
diff --git a/resources/views/components/seller-sidebar.blade.php b/resources/views/components/seller-sidebar.blade.php
index 41c9a456..4f15ca2f 100644
--- a/resources/views/components/seller-sidebar.blade.php
+++ b/resources/views/components/seller-sidebar.blade.php
@@ -541,6 +541,17 @@
                      ═══════════════════════════════════════════════════════════ --}}
                 @if($sidebarBusiness)
                 <p class="menu-label px-2.5 pt-3 pb-1.5">Inbox</p>
+
+                {{-- Chat - Full-screen unified inbox (Premium) --}}
+                @if($sidebarBusiness->hasSalesSuite())
+                <a class="menu-item {{ request()->routeIs('seller.business.chat.*') ? 'active' : '' }}"
+                   href="{{ route('seller.business.chat.index', $sidebarBusiness->slug) }}">
+                    <span class="icon-[lucide--message-circle] size-4"></span>
+                    <span class="grow">Chat</span>
+                    <span class="badge badge-primary badge-xs">New</span>
+                </a>
+                @endif
+
                 <div class="group collapse">
                     <input
                         aria-label="Sidemenu item trigger"
diff --git a/resources/views/seller/chat/index.blade.php b/resources/views/seller/chat/index.blade.php
new file mode 100644
index 00000000..3b4aeb8a
--- /dev/null
+++ b/resources/views/seller/chat/index.blade.php
@@ -0,0 +1,814 @@
+@extends('layouts.seller')
+
+@section('title', 'Chat - ' . $business->name)
+
+@push('styles')
+<style>
+    /* Full height chat layout */
+    .chat-container {
+        height: calc(100vh - 64px);
+        display: flex;
+        overflow: hidden;
+    }
+
+    /* Left sidebar - conversation list */
+    .chat-sidebar {
+        width: 340px;
+        min-width: 340px;
+        display: flex;
+        flex-direction: column;
+        border-right: 1px solid oklch(var(--b3));
+        background: oklch(var(--b2));
+    }
+
+    /* Center - message thread */
+    .chat-main {
+        flex: 1;
+        display: flex;
+        flex-direction: column;
+        min-width: 0;
+        background: oklch(var(--b1));
+    }
+
+    /* Right sidebar - contact details */
+    .chat-details {
+        width: 320px;
+        min-width: 320px;
+        border-left: 1px solid oklch(var(--b3));
+        background: oklch(var(--b2));
+        overflow-y: auto;
+    }
+
+    /* Conversation list item */
+    .conversation-item {
+        padding: 12px 16px;
+        border-bottom: 1px solid oklch(var(--b3));
+        cursor: pointer;
+        transition: background 0.15s;
+    }
+    .conversation-item:hover {
+        background: oklch(var(--b3));
+    }
+    .conversation-item.active {
+        background: oklch(var(--p) / 0.1);
+        border-left: 3px solid oklch(var(--p));
+    }
+    .conversation-item.unread {
+        background: oklch(var(--p) / 0.05);
+    }
+
+    /* Messages area */
+    .messages-container {
+        flex: 1;
+        overflow-y: auto;
+        padding: 16px;
+    }
+
+    /* Message bubbles */
+    .message-bubble {
+        max-width: 65%;
+        padding: 10px 14px;
+        border-radius: 16px;
+        margin-bottom: 8px;
+    }
+    .message-bubble.outbound {
+        background: oklch(var(--p));
+        color: oklch(var(--pc));
+        margin-left: auto;
+        border-bottom-right-radius: 4px;
+    }
+    .message-bubble.inbound {
+        background: oklch(var(--b2));
+        border-bottom-left-radius: 4px;
+    }
+
+    /* Reply box */
+    .reply-box {
+        padding: 16px;
+        border-top: 1px solid oklch(var(--b3));
+        background: oklch(var(--b2));
+    }
+
+    /* Hide scrollbar but keep functionality */
+    .hide-scrollbar::-webkit-scrollbar {
+        width: 6px;
+    }
+    .hide-scrollbar::-webkit-scrollbar-track {
+        background: transparent;
+    }
+    .hide-scrollbar::-webkit-scrollbar-thumb {
+        background: oklch(var(--bc) / 0.2);
+        border-radius: 3px;
+    }
+    .hide-scrollbar::-webkit-scrollbar-thumb:hover {
+        background: oklch(var(--bc) / 0.3);
+    }
+</style>
+@endpush
+
+@section('content')
+<div class="chat-container" x-data="chatApp()" x-init="init()">
+    {{-- LEFT SIDEBAR: Conversation List --}}
+    <div class="chat-sidebar">
+        {{-- Header --}}
+        <div class="p-4 border-b border-base-300">
+            <div class="flex items-center justify-between mb-3">
+                <h1 class="text-lg font-bold">Conversations</h1>
+                <button @click="showNewConversation = true" class="btn btn-primary btn-sm gap-1">
+                    <span class="icon-[heroicons--plus] size-4"></span>
+                    New
+                </button>
+            </div>
+
+            {{-- Search --}}
+            <div class="relative mb-3">
+                <span class="icon-[heroicons--magnifying-glass] size-4 absolute left-3 top-1/2 -translate-y-1/2 text-base-content/40"></span>
+                <input
+                    type="text"
+                    x-model="searchQuery"
+                    @input.debounce.300ms="filterConversations()"
+                    placeholder="Search conversations..."
+                    class="input input-sm input-bordered w-full pl-9"
+                >
+            </div>
+
+            {{-- Filters --}}
+            <div class="flex gap-2">
+                <select x-model="statusFilter" @change="filterConversations()" class="select select-bordered select-xs flex-1">
+                    <option value="">All Status</option>
+                    <option value="open">Open</option>
+                    <option value="pending">Pending</option>
+                    <option value="closed">Resolved</option>
+                </select>
+                <select x-model="assigneeFilter" @change="filterConversations()" class="select select-bordered select-xs flex-1">
+                    <option value="">All</option>
+                    <option value="mine">Mine</option>
+                    <option value="unassigned">Unassigned</option>
+                </select>
+            </div>
+        </div>
+
+        {{-- Conversation List --}}
+        <div class="flex-1 overflow-y-auto hide-scrollbar">
+            @forelse($threads as $thread)
+                <div
+                    class="conversation-item"
+                    :class="{
+                        'active': selectedThreadId === {{ $thread->id }},
+                        'unread': {{ $thread->is_unread ? 'true' : 'false' }} && selectedThreadId !== {{ $thread->id }}
+                    }"
+                    @click="selectThread({{ $thread->id }})"
+                >
+                    <div class="flex items-start gap-3">
+                        {{-- Avatar --}}
+                        <div class="avatar placeholder flex-shrink-0">
+                            <div class="bg-neutral text-neutral-content rounded-full w-10 h-10">
+                                <span class="text-sm">{{ substr($thread->contact->name ?? '?', 0, 2) }}</span>
+                            </div>
+                        </div>
+
+                        {{-- Content --}}
+                        <div class="flex-1 min-w-0">
+                            <div class="flex items-center justify-between gap-2">
+                                <span class="font-medium truncate text-sm {{ $thread->is_unread ? 'text-primary' : '' }}">
+                                    {{ $thread->contact->name ?? 'Unknown' }}
+                                </span>
+                                <span class="text-xs text-base-content/50 flex-shrink-0">
+                                    {{ $thread->last_message_at?->shortRelativeDiffForHumans() }}
+                                </span>
+                            </div>
+
+                            @if($thread->contact->business)
+                                <div class="text-xs text-base-content/60 truncate">
+                                    {{ $thread->contact->business->name }}
+                                </div>
+                            @endif
+
+                            <div class="text-xs text-base-content/50 truncate mt-0.5">
+                                {{ Str::limit($thread->last_message_preview, 50) }}
+                            </div>
+
+                            {{-- Tags --}}
+                            <div class="flex items-center gap-1 mt-1.5 flex-wrap">
+                                @if($thread->status === 'open')
+                                    <span class="badge badge-success badge-xs">Open</span>
+                                @elseif($thread->status === 'pending')
+                                    <span class="badge badge-warning badge-xs">Pending</span>
+                                @else
+                                    <span class="badge badge-ghost badge-xs">Resolved</span>
+                                @endif
+
+                                @if($thread->last_channel_type)
+                                    <span class="badge badge-outline badge-xs">{{ ucfirst($thread->last_channel_type) }}</span>
+                                @endif
+
+                                @if($thread->assignee)
+                                    <span class="text-xs text-base-content/40">{{ Str::limit($thread->assignee->name, 10) }}</span>
+                                @endif
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            @empty
+                <div class="p-8 text-center text-base-content/50">
+                    <span class="icon-[heroicons--chat-bubble-left-right] size-12 mx-auto mb-3 opacity-50"></span>
+                    <p class="text-sm">No conversations yet</p>
+                </div>
+            @endforelse
+        </div>
+    </div>
+
+    {{-- CENTER: Chat Thread --}}
+    <div class="chat-main">
+        {{-- Empty State --}}
+        <template x-if="!selectedThreadId">
+            <div class="flex-1 flex items-center justify-center">
+                <div class="text-center">
+                    <span class="icon-[heroicons--chat-bubble-left-right] size-16 text-base-content/20 mx-auto mb-4"></span>
+                    <h3 class="text-lg font-medium mb-2">Select a conversation</h3>
+                    <p class="text-base-content/50 text-sm">Choose a conversation from the list to start chatting</p>
+                    <button @click="showNewConversation = true" class="btn btn-primary btn-sm mt-4 gap-1">
+                        <span class="icon-[heroicons--plus] size-4"></span>
+                        Start New Conversation
+                    </button>
+                </div>
+            </div>
+        </template>
+
+        {{-- Active Thread --}}
+        <template x-if="selectedThreadId && currentThread">
+            <div class="flex flex-col h-full">
+                {{-- Thread Header --}}
+                <div class="p-4 border-b border-base-300 bg-base-100">
+                    <div class="flex items-center justify-between">
+                        <div class="flex items-center gap-3">
+                            <div class="avatar placeholder">
+                                <div class="bg-neutral text-neutral-content rounded-full w-10 h-10">
+                                    <span x-text="currentThread.contact?.name?.substring(0, 2) || '?'"></span>
+                                </div>
+                            </div>
+                            <div>
+                                <h2 class="font-semibold" x-text="currentThread.contact?.name || 'Unknown'"></h2>
+                                <div class="text-xs text-base-content/60" x-text="currentThread.contact?.email || currentThread.contact?.phone"></div>
+                            </div>
+                        </div>
+
+                        <div class="flex items-center gap-2">
+                            {{-- Status badge --}}
+                            <span
+                                class="badge"
+                                :class="{
+                                    'badge-success': currentThread.status === 'open',
+                                    'badge-warning': currentThread.status === 'pending',
+                                    'badge-ghost': currentThread.status === 'closed'
+                                }"
+                                x-text="currentThread.status === 'closed' ? 'Resolved' : (currentThread.status?.charAt(0).toUpperCase() + currentThread.status?.slice(1))"
+                            ></span>
+
+                            {{-- Actions --}}
+                            <div class="dropdown dropdown-end">
+                                <button tabindex="0" class="btn btn-ghost btn-sm btn-square">
+                                    <span class="icon-[heroicons--ellipsis-vertical] size-5"></span>
+                                </button>
+                                <ul tabindex="0" class="dropdown-content menu menu-sm p-2 shadow-lg bg-base-100 rounded-lg w-48 border border-base-300 z-50">
+                                    <li x-show="currentThread.status !== 'closed'">
+                                        <button @click="closeThread()">
+                                            <span class="icon-[heroicons--check-circle] size-4"></span>
+                                            Mark Resolved
+                                        </button>
+                                    </li>
+                                    <li x-show="currentThread.status === 'closed'">
+                                        <button @click="reopenThread()">
+                                            <span class="icon-[heroicons--arrow-path] size-4"></span>
+                                            Reopen
+                                        </button>
+                                    </li>
+                                </ul>
+                            </div>
+
+                            {{-- Toggle details panel --}}
+                            <button
+                                @click="showDetails = !showDetails"
+                                class="btn btn-ghost btn-sm btn-square"
+                                :class="{ 'btn-active': showDetails }"
+                            >
+                                <span class="icon-[heroicons--information-circle] size-5"></span>
+                            </button>
+                        </div>
+                    </div>
+                </div>
+
+                {{-- Messages --}}
+                <div class="messages-container hide-scrollbar" id="messages-container">
+                    <template x-for="message in currentThread.messages" :key="message.id">
+                        <div class="flex" :class="message.direction === 'outbound' ? 'justify-end' : 'justify-start'">
+                            <div class="message-bubble" :class="message.direction === 'outbound' ? 'outbound' : 'inbound'">
+                                <div class="text-xs opacity-70 mb-1 flex items-center gap-2">
+                                    <span x-text="message.direction === 'outbound' ? (message.user?.name || 'You') : currentThread.contact?.name"></span>
+                                    <span>&bull;</span>
+                                    <span x-text="formatTime(message.created_at)"></span>
+                                </div>
+                                <div class="whitespace-pre-wrap text-sm" x-text="message.body"></div>
+                            </div>
+                        </div>
+                    </template>
+
+                    {{-- Typing indicator --}}
+                    <div x-show="sending" class="flex justify-end">
+                        <div class="message-bubble outbound opacity-60">
+                            <span class="loading loading-dots loading-xs"></span>
+                        </div>
+                    </div>
+                </div>
+
+                {{-- Reply Box --}}
+                <div class="reply-box">
+                    <form @submit.prevent="sendReply()">
+                        <div class="flex gap-2 mb-2">
+                            <select x-model="replyChannel" class="select select-bordered select-sm">
+                                @foreach($channels as $channel)
+                                    <option value="{{ $channel->type }}">{{ ucfirst($channel->type) }}</option>
+                                @endforeach
+                            </select>
+                            <button type="button" @click="generateAiReply()" class="btn btn-ghost btn-sm gap-1" :disabled="generatingAi">
+                                <span class="icon-[heroicons--sparkles] size-4"></span>
+                                <span x-show="!generatingAi">AI Draft</span>
+                                <span x-show="generatingAi" class="loading loading-spinner loading-xs"></span>
+                            </button>
+                        </div>
+                        <div class="flex gap-2">
+                            <textarea
+                                x-model="replyMessage"
+                                @keydown.meta.enter="sendReply()"
+                                @keydown.ctrl.enter="sendReply()"
+                                placeholder="Type your message... (Cmd+Enter to send)"
+                                rows="2"
+                                class="textarea textarea-bordered flex-1 text-sm resize-none"
+                                :disabled="sending"
+                            ></textarea>
+                            <button type="submit" class="btn btn-primary self-end" :disabled="!replyMessage.trim() || sending">
+                                <span x-show="!sending" class="icon-[heroicons--paper-airplane] size-5"></span>
+                                <span x-show="sending" class="loading loading-spinner loading-sm"></span>
+                            </button>
+                        </div>
+                    </form>
+                </div>
+            </div>
+        </template>
+
+        {{-- Loading State --}}
+        <template x-if="selectedThreadId && !currentThread && loading">
+            <div class="flex-1 flex items-center justify-center">
+                <span class="loading loading-spinner loading-lg text-primary"></span>
+            </div>
+        </template>
+    </div>
+
+    {{-- RIGHT SIDEBAR: Contact Details --}}
+    <div class="chat-details" x-show="showDetails && currentThread" x-cloak>
+        <template x-if="currentThread">
+            <div class="p-4">
+                {{-- Contact Card --}}
+                <div class="text-center mb-6 pb-6 border-b border-base-300">
+                    <div class="avatar placeholder mb-3">
+                        <div class="bg-neutral text-neutral-content rounded-full w-16 h-16">
+                            <span class="text-xl" x-text="currentThread.contact?.name?.substring(0, 2) || '?'"></span>
+                        </div>
+                    </div>
+                    <h3 class="font-semibold" x-text="currentThread.contact?.name"></h3>
+                    <p class="text-sm text-base-content/60" x-text="currentThread.account?.name || currentThread.contact?.business?.name"></p>
+                </div>
+
+                {{-- Contact Info --}}
+                <div class="mb-6">
+                    <h4 class="text-xs font-semibold text-base-content/50 uppercase tracking-wide mb-3">Contact Info</h4>
+                    <div class="space-y-2 text-sm">
+                        <div class="flex items-center gap-2" x-show="currentThread.contact?.email">
+                            <span class="icon-[heroicons--envelope] size-4 text-base-content/50"></span>
+                            <span x-text="currentThread.contact?.email"></span>
+                        </div>
+                        <div class="flex items-center gap-2" x-show="currentThread.contact?.phone">
+                            <span class="icon-[heroicons--phone] size-4 text-base-content/50"></span>
+                            <span x-text="currentThread.contact?.phone"></span>
+                        </div>
+                    </div>
+                </div>
+
+                {{-- Assignment --}}
+                <div class="mb-6">
+                    <h4 class="text-xs font-semibold text-base-content/50 uppercase tracking-wide mb-3">Assignment</h4>
+                    <select x-model="currentThread.assigned_to" @change="assignThread()" class="select select-bordered select-sm w-full">
+                        <option value="">Unassigned</option>
+                        @foreach($teamMembers as $member)
+                            <option value="{{ $member->id }}">{{ $member->name }}</option>
+                        @endforeach
+                    </select>
+                </div>
+
+                {{-- Channel --}}
+                <div class="mb-6" x-show="currentThread.last_channel_type">
+                    <h4 class="text-xs font-semibold text-base-content/50 uppercase tracking-wide mb-3">Channel</h4>
+                    <span class="badge badge-outline" x-text="currentThread.last_channel_type?.charAt(0).toUpperCase() + currentThread.last_channel_type?.slice(1)"></span>
+                </div>
+
+                {{-- Related Deals --}}
+                <template x-if="currentThread.deals?.length > 0">
+                    <div class="mb-6">
+                        <h4 class="text-xs font-semibold text-base-content/50 uppercase tracking-wide mb-3">Related Deals</h4>
+                        <div class="space-y-2">
+                            <template x-for="deal in currentThread.deals" :key="deal.id">
+                                <a :href="`{{ route('seller.business.crm.deals.index', $business->slug) }}/${deal.id}`" class="block p-2 bg-base-100 rounded-lg hover:bg-base-300 text-sm">
+                                    <div class="font-medium" x-text="deal.name"></div>
+                                    <div class="text-xs text-base-content/60">
+                                        $<span x-text="deal.value?.toLocaleString()"></span> - <span x-text="deal.stage"></span>
+                                    </div>
+                                </a>
+                            </template>
+                        </div>
+                    </div>
+                </template>
+
+                {{-- Internal Notes --}}
+                <div>
+                    <h4 class="text-xs font-semibold text-base-content/50 uppercase tracking-wide mb-3">Internal Notes</h4>
+                    <form @submit.prevent="addNote()" class="mb-3">
+                        <textarea x-model="newNote" rows="2" placeholder="Add a note..." class="textarea textarea-bordered textarea-sm w-full mb-2"></textarea>
+                        <button type="submit" class="btn btn-xs btn-outline" :disabled="!newNote.trim()">Add Note</button>
+                    </form>
+                    <div class="space-y-2 max-h-48 overflow-y-auto">
+                        <template x-for="note in currentThread.internal_notes" :key="note.id">
+                            <div class="p-2 bg-base-100 rounded-lg text-xs">
+                                <div class="text-base-content/50 mb-1">
+                                    <span x-text="note.user?.name"></span> &bull; <span x-text="formatTime(note.created_at)"></span>
+                                </div>
+                                <div x-text="note.content"></div>
+                            </div>
+                        </template>
+                    </div>
+                </div>
+            </div>
+        </template>
+    </div>
+
+    {{-- New Conversation Modal --}}
+    <dialog id="new-conversation-modal" class="modal" :class="{ 'modal-open': showNewConversation }">
+        <div class="modal-box">
+            <h3 class="font-bold text-lg mb-4">New Conversation</h3>
+            <form @submit.prevent="createConversation()">
+                <div class="form-control mb-4">
+                    <label class="label">
+                        <span class="label-text">Contact</span>
+                    </label>
+                    <select x-model="newConversation.contact_id" class="select select-bordered w-full" required>
+                        <option value="">Select a contact...</option>
+                        @foreach($contacts as $contact)
+                            <option value="{{ $contact->id }}">
+                                {{ $contact->name }} {{ $contact->business ? '(' . $contact->business->name . ')' : '' }}
+                            </option>
+                        @endforeach
+                    </select>
+                </div>
+                <div class="form-control mb-4">
+                    <label class="label">
+                        <span class="label-text">Channel</span>
+                    </label>
+                    <select x-model="newConversation.channel_type" class="select select-bordered w-full" required>
+                        @foreach($channels as $channel)
+                            <option value="{{ $channel->type }}">{{ ucfirst($channel->type) }}</option>
+                        @endforeach
+                    </select>
+                </div>
+                <div class="form-control mb-4">
+                    <label class="label">
+                        <span class="label-text">Message</span>
+                    </label>
+                    <textarea x-model="newConversation.body" rows="4" class="textarea textarea-bordered w-full" placeholder="Type your message..." required></textarea>
+                </div>
+                <div class="modal-action">
+                    <button type="button" @click="showNewConversation = false" class="btn btn-ghost">Cancel</button>
+                    <button type="submit" class="btn btn-primary" :disabled="creatingConversation">
+                        <span x-show="!creatingConversation">Start Conversation</span>
+                        <span x-show="creatingConversation" class="loading loading-spinner loading-sm"></span>
+                    </button>
+                </div>
+            </form>
+        </div>
+        <form method="dialog" class="modal-backdrop">
+            <button @click="showNewConversation = false">close</button>
+        </form>
+    </dialog>
+</div>
+
+@push('scripts')
+<script>
+function chatApp() {
+    return {
+        // State
+        selectedThreadId: null,
+        currentThread: null,
+        loading: false,
+        sending: false,
+        showDetails: true,
+        showNewConversation: false,
+
+        // Filters
+        searchQuery: '',
+        statusFilter: '',
+        assigneeFilter: '',
+
+        // Reply
+        replyMessage: '',
+        replyChannel: '{{ $channels->first()?->type ?? 'email' }}',
+        generatingAi: false,
+
+        // Notes
+        newNote: '',
+
+        // New conversation
+        newConversation: {
+            contact_id: '',
+            channel_type: '{{ $channels->first()?->type ?? 'email' }}',
+            body: ''
+        },
+        creatingConversation: false,
+
+        // Heartbeat interval
+        heartbeatInterval: null,
+
+        init() {
+            // Check URL for thread ID
+            const urlParams = new URLSearchParams(window.location.search);
+            const threadId = urlParams.get('thread');
+            if (threadId) {
+                this.selectThread(parseInt(threadId));
+            }
+        },
+
+        async selectThread(threadId) {
+            if (this.selectedThreadId === threadId) return;
+
+            // Clear previous heartbeat
+            if (this.heartbeatInterval) {
+                clearInterval(this.heartbeatInterval);
+            }
+
+            this.selectedThreadId = threadId;
+            this.loading = true;
+            this.currentThread = null;
+
+            // Update URL
+            const url = new URL(window.location);
+            url.searchParams.set('thread', threadId);
+            window.history.replaceState({}, '', url);
+
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${threadId}`);
+                const data = await response.json();
+                this.currentThread = data.thread;
+                this.replyChannel = data.thread.last_channel_type || '{{ $channels->first()?->type ?? 'email' }}';
+
+                // Scroll to bottom
+                this.$nextTick(() => {
+                    this.scrollToBottom();
+                });
+
+                // Start heartbeat
+                this.heartbeatInterval = setInterval(() => this.sendHeartbeat(), 30000);
+
+            } catch (error) {
+                console.error('Failed to load thread:', error);
+            } finally {
+                this.loading = false;
+            }
+        },
+
+        async sendReply() {
+            if (!this.replyMessage.trim() || this.sending) return;
+
+            this.sending = true;
+
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/reply`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    },
+                    body: JSON.stringify({
+                        body: this.replyMessage,
+                        channel_type: this.replyChannel
+                    })
+                });
+
+                const data = await response.json();
+
+                if (data.success) {
+                    this.currentThread.messages = data.messages;
+                    this.replyMessage = '';
+                    this.$nextTick(() => this.scrollToBottom());
+                }
+            } catch (error) {
+                console.error('Failed to send reply:', error);
+            } finally {
+                this.sending = false;
+            }
+        },
+
+        async generateAiReply() {
+            if (this.generatingAi) return;
+
+            this.generatingAi = true;
+
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/ai-reply`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    }
+                });
+
+                const data = await response.json();
+
+                if (data.content) {
+                    this.replyMessage = data.content;
+                }
+            } catch (error) {
+                console.error('Failed to generate AI reply:', error);
+            } finally {
+                this.generatingAi = false;
+            }
+        },
+
+        async closeThread() {
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/close`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    }
+                });
+
+                const data = await response.json();
+                if (data.success) {
+                    this.currentThread.status = 'closed';
+                }
+            } catch (error) {
+                console.error('Failed to close thread:', error);
+            }
+        },
+
+        async reopenThread() {
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/reopen`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    }
+                });
+
+                const data = await response.json();
+                if (data.success) {
+                    this.currentThread.status = 'open';
+                }
+            } catch (error) {
+                console.error('Failed to reopen thread:', error);
+            }
+        },
+
+        async assignThread() {
+            try {
+                await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/assign`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    },
+                    body: JSON.stringify({
+                        assigned_to: this.currentThread.assigned_to || null
+                    })
+                });
+            } catch (error) {
+                console.error('Failed to assign thread:', error);
+            }
+        },
+
+        async addNote() {
+            if (!this.newNote.trim()) return;
+
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/note`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    },
+                    body: JSON.stringify({
+                        content: this.newNote
+                    })
+                });
+
+                const data = await response.json();
+                if (data.success) {
+                    this.currentThread.internal_notes.push(data.note);
+                    this.newNote = '';
+                }
+            } catch (error) {
+                console.error('Failed to add note:', error);
+            }
+        },
+
+        async createConversation() {
+            if (this.creatingConversation) return;
+
+            this.creatingConversation = true;
+
+            try {
+                const response = await fetch(`{{ route('seller.business.chat.index', $business->slug) }}`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    },
+                    body: JSON.stringify(this.newConversation)
+                });
+
+                const data = await response.json();
+
+                if (data.success) {
+                    this.showNewConversation = false;
+                    this.newConversation = { contact_id: '', channel_type: '{{ $channels->first()?->type ?? 'email' }}', body: '' };
+                    // Reload page to get new thread in list
+                    window.location.href = `{{ route('seller.business.chat.index', $business->slug) }}?thread=${data.thread.id}`;
+                }
+            } catch (error) {
+                console.error('Failed to create conversation:', error);
+            } finally {
+                this.creatingConversation = false;
+            }
+        },
+
+        async sendHeartbeat() {
+            if (!this.selectedThreadId) return;
+
+            try {
+                await fetch(`{{ route('seller.business.chat.index', $business->slug) }}/${this.selectedThreadId}/heartbeat`, {
+                    method: 'POST',
+                    headers: {
+                        'Content-Type': 'application/json',
+                        'X-CSRF-TOKEN': '{{ csrf_token() }}'
+                    }
+                });
+            } catch (error) {
+                console.error('Heartbeat failed:', error);
+            }
+        },
+
+        filterConversations() {
+            // Redirect with filters
+            const url = new URL(window.location);
+
+            if (this.searchQuery) url.searchParams.set('search', this.searchQuery);
+            else url.searchParams.delete('search');
+
+            if (this.statusFilter) url.searchParams.set('status', this.statusFilter);
+            else url.searchParams.delete('status');
+
+            if (this.assigneeFilter) {
+                if (this.assigneeFilter === 'mine') {
+                    url.searchParams.set('assigned_to', '{{ auth()->id() }}');
+                } else {
+                    url.searchParams.set('assigned_to', this.assigneeFilter);
+                }
+            } else {
+                url.searchParams.delete('assigned_to');
+            }
+
+            window.location.href = url.toString();
+        },
+
+        scrollToBottom() {
+            const container = document.getElementById('messages-container');
+            if (container) {
+                container.scrollTop = container.scrollHeight;
+            }
+        },
+
+        formatTime(dateString) {
+            if (!dateString) return '';
+            const date = new Date(dateString);
+            return date.toLocaleString('en-US', {
+                month: 'short',
+                day: 'numeric',
+                hour: 'numeric',
+                minute: '2-digit',
+                hour12: true
+            });
+        }
+    }
+}
+</script>
+@endpush
+@endsection
diff --git a/routes/seller.php b/routes/seller.php
index f6aa3cd4..766f661a 100644
--- a/routes/seller.php
+++ b/routes/seller.php
@@ -709,6 +709,25 @@ Route::prefix('s')->name('seller.')->middleware('seller')->group(function () {
             Route::delete('/{expense}', [\App\Http\Controllers\Seller\ExpensesController::class, 'destroy'])->name('destroy');
         });
 
+        // ================================================================================
+        // CHAT - Unified Inbox (Chatwoot-style)
+        // ================================================================================
+        // Access: /s/{business}/chat
+        // Features: Full-screen 3-panel chat interface with conversation list,
+        // message thread, and contact details sidebar.
+        Route::prefix('chat')->name('chat.')->middleware('suite:sales')->group(function () {
+            Route::get('/', [\App\Http\Controllers\Seller\ChatController::class, 'index'])->name('index');
+            Route::post('/', [\App\Http\Controllers\Seller\ChatController::class, 'store'])->name('store');
+            Route::get('/{thread}', [\App\Http\Controllers\Seller\ChatController::class, 'getThread'])->name('show');
+            Route::post('/{thread}/reply', [\App\Http\Controllers\Seller\ChatController::class, 'reply'])->name('reply');
+            Route::post('/{thread}/assign', [\App\Http\Controllers\Seller\ChatController::class, 'assign'])->name('assign');
+            Route::post('/{thread}/close', [\App\Http\Controllers\Seller\ChatController::class, 'close'])->name('close');
+            Route::post('/{thread}/reopen', [\App\Http\Controllers\Seller\ChatController::class, 'reopen'])->name('reopen');
+            Route::post('/{thread}/note', [\App\Http\Controllers\Seller\ChatController::class, 'addNote'])->name('note');
+            Route::post('/{thread}/ai-reply', [\App\Http\Controllers\Seller\ChatController::class, 'generateAiReply'])->name('ai-reply');
+            Route::post('/{thread}/heartbeat', [\App\Http\Controllers\Seller\ChatController::class, 'heartbeat'])->name('heartbeat');
+        });
+
         // ================================================================================
         // CRM MODULE
         // ================================================================================