diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5a006b9..3afc6da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,9 +20,21 @@ jobs:
           extensions: mbstring, sqlite3, pdo_sqlite
           coverage: none
 
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
       - name: Install Composer dependencies
         run: composer install --no-interaction --prefer-dist
 
+      - name: Install NPM dependencies
+        run: npm ci
+
+      - name: Build assets
+        run: npm run build
+
       - name: Copy environment file
         run: cp .env.example .env
 
diff --git a/app/Livewire/Concerns/HasVersionHistory.php b/app/Livewire/Concerns/HasVersionHistory.php
new file mode 100644
index 0000000..e814105
--- /dev/null
+++ b/app/Livewire/Concerns/HasVersionHistory.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace App\Livewire\Concerns;
+
+use App\Models\DocumentVersion;
+use Illuminate\Support\Collection;
+use Illuminate\Support\Facades\DB;
+use Livewire\Attributes\Computed;
+
+trait HasVersionHistory
+{
+    public bool $showVersionHistory = false;
+
+    public ?string $previewVersionId = null;
+
+    public function openVersionHistory(): void
+    {
+        $this->showVersionHistory = true;
+        $this->previewVersionId = null;
+    }
+
+    public function closeVersionHistory(): void
+    {
+        $this->showVersionHistory = false;
+        $this->previewVersionId = null;
+    }
+
+    public function selectVersion(string $versionId): void
+    {
+        $this->previewVersionId = $versionId;
+    }
+
+    public function restoreVersion(string $versionId): void
+    {
+        $oldVersion = DocumentVersion::findOrFail($versionId);
+        $document = $this->document;
+
+        if (! $document) {
+            return;
+        }
+
+        // Verify version belongs to this document
+        if ($oldVersion->document_id !== $document->id) {
+            return;
+        }
+
+        // Verify user has permission to update this project
+        $this->authorize('update', $document->project);
+
+        // Wrap in transaction for atomicity
+        DB::transaction(function () use ($oldVersion, $document) {
+            // Create new version from old content
+            $newVersion = DocumentVersion::create([
+                'document_id' => $document->id,
+                'created_by' => auth()->id(),
+                'content_md' => $oldVersion->content_md,
+                'summary' => 'Restored from '.$oldVersion->created_at->format('M j, Y g:i A'),
+            ]);
+
+            // Update document to point to new version
+            $document->update(['current_version_id' => $newVersion->id]);
+        });
+
+        // Refresh UI state
+        $this->loadContent();
+        unset($this->document);
+        unset($this->versions);
+
+        $this->closeVersionHistory();
+
+        // Notify other components
+        $this->dispatch('docUpdated', type: $document->type->value);
+        $this->dispatch('version-restored', message: 'Version restored successfully');
+    }
+
+    #[Computed]
+    public function versions(): Collection
+    {
+        if (! $this->document) {
+            return collect();
+        }
+
+        return $this->document
+            ->versions()
+            ->with(['createdBy', 'planRun'])
+            ->orderByDesc('created_at')
+            ->get();
+    }
+
+    #[Computed]
+    public function selectedVersionForPreview(): ?DocumentVersion
+    {
+        if (! $this->previewVersionId) {
+            return null;
+        }
+
+        return $this->versions->firstWhere('id', $this->previewVersionId);
+    }
+}
diff --git a/app/Livewire/Projects/Tabs/KanbanBoard.php b/app/Livewire/Projects/Tabs/KanbanBoard.php
index 189d842..67552ba 100644
--- a/app/Livewire/Projects/Tabs/KanbanBoard.php
+++ b/app/Livewire/Projects/Tabs/KanbanBoard.php
@@ -7,7 +7,6 @@
 use App\Models\Project;
 use App\Models\Task;
 use App\Models\TaskSet;
-use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
 use Filament\Actions\Concerns\InteractsWithActions;
 use Filament\Actions\Contracts\HasActions;
 use Filament\Actions\CreateAction;
@@ -20,6 +19,7 @@
 use Filament\Forms\Contracts\HasForms;
 use Filament\Infolists\Components\TextEntry;
 use Filament\Schemas\Schema;
+use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
 use Livewire\Attributes\Computed;
 use Livewire\Attributes\On;
 use Livewire\Component;
diff --git a/app/Livewire/Projects/Tabs/Prd.php b/app/Livewire/Projects/Tabs/Prd.php
index 3021aa8..13fd16a 100644
--- a/app/Livewire/Projects/Tabs/Prd.php
+++ b/app/Livewire/Projects/Tabs/Prd.php
@@ -3,6 +3,7 @@
 namespace App\Livewire\Projects\Tabs;
 
 use App\Enums\DocumentType;
+use App\Livewire\Concerns\HasVersionHistory;
 use App\Models\Document;
 use App\Models\DocumentVersion;
 use App\Models\Project;
@@ -14,6 +15,7 @@
 class Prd extends Component
 {
     use AuthorizesRequests;
+    use HasVersionHistory;
 
     public string $projectId;
 
diff --git a/app/Livewire/Projects/Tabs/Tech.php b/app/Livewire/Projects/Tabs/Tech.php
index 207859e..add3232 100644
--- a/app/Livewire/Projects/Tabs/Tech.php
+++ b/app/Livewire/Projects/Tabs/Tech.php
@@ -5,11 +5,12 @@
 use App\Actions\GenerateTasksFromTechSpec;
 use App\Enums\DocumentType;
 use App\Enums\PlanRunStepStatus;
+use App\Livewire\Concerns\HasVersionHistory;
 use App\Models\Document;
 use App\Models\DocumentVersion;
 use App\Models\Project;
-use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
 use App\Models\TaskSet;
+use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
 use Livewire\Attributes\Computed;
 use Livewire\Attributes\On;
 use Livewire\Component;
@@ -17,6 +18,7 @@
 class Tech extends Component
 {
     use AuthorizesRequests;
+    use HasVersionHistory;
 
     public string $projectId;
 
diff --git a/resources/views/components/version-history-slide-over.blade.php b/resources/views/components/version-history-slide-over.blade.php
new file mode 100644
index 0000000..3577e71
--- /dev/null
+++ b/resources/views/components/version-history-slide-over.blade.php
@@ -0,0 +1,215 @@
+@props([
+    'versions',
+    'selectedVersion' => null,
+    'previewVersionId' => null,
+    'currentVersionId' => null,
+])
+
+<div
+    x-data="{ show: @entangle('showVersionHistory').live }"
+    x-show="show"
+    x-cloak
+    class="fixed inset-0 z-50 overflow-hidden"
+    @keydown.escape.window="$wire.closeVersionHistory()"
+>
+    {{-- Backdrop --}}
+    <div
+        x-show="show"
+        x-transition:enter="ease-in-out duration-300"
+        x-transition:enter-start="opacity-0"
+        x-transition:enter-end="opacity-100"
+        x-transition:leave="ease-in-out duration-200"
+        x-transition:leave-start="opacity-100"
+        x-transition:leave-end="opacity-0"
+        class="fixed inset-0 bg-black/40 transition-opacity"
+        wire:click="closeVersionHistory"
+    ></div>
+
+    {{-- Slide-over panel --}}
+    <div class="fixed inset-y-0 right-0 flex max-w-full pl-10">
+        <div
+            x-show="show"
+            x-transition:enter="transform transition ease-in-out duration-300"
+            x-transition:enter-start="translate-x-full"
+            x-transition:enter-end="translate-x-0"
+            x-transition:leave="transform transition ease-in-out duration-200"
+            x-transition:leave-start="translate-x-0"
+            x-transition:leave-end="translate-x-full"
+            class="w-screen max-w-3xl"
+        >
+            <div class="flex h-full flex-col bg-white shadow-xl">
+                {{-- Header --}}
+                <div class="px-6 py-4 bg-gray-50 border-b border-gray-200">
+                    <div class="flex items-center justify-between">
+                        <div class="flex items-center gap-3">
+                            <svg class="w-5 h-5 text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                            </svg>
+                            <h2 class="text-lg font-semibold text-gray-900">Version History</h2>
+                        </div>
+                        <button
+                            wire:click="closeVersionHistory"
+                            class="p-2 text-gray-400 hover:text-gray-600 hover:bg-gray-100 rounded-lg transition"
+                        >
+                            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"/>
+                            </svg>
+                        </button>
+                    </div>
+                </div>
+
+                {{-- Content: Two-column layout --}}
+                <div class="flex-1 flex overflow-hidden">
+                    {{-- Left: Version list --}}
+                    <div class="w-72 border-r border-gray-200 overflow-y-auto bg-gray-50">
+                        @if($versions->isEmpty())
+                            <div class="p-6 text-center">
+                                <svg class="w-12 h-12 mx-auto mb-3 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                                </svg>
+                                <p class="text-sm text-gray-500">No versions yet</p>
+                            </div>
+                        @else
+                            <div class="py-2">
+                                @foreach($versions as $version)
+                                    <button
+                                        wire:click="selectVersion('{{ $version->id }}')"
+                                        wire:key="version-{{ $version->id }}"
+                                        @class([
+                                            'w-full text-left px-4 py-3 hover:bg-white transition border-l-4',
+                                            'bg-white border-l-indigo-600 shadow-sm' => $previewVersionId === $version->id,
+                                            'border-l-transparent' => $previewVersionId !== $version->id,
+                                        ])
+                                    >
+                                        <div class="flex items-start justify-between gap-2">
+                                            <div class="flex-1 min-w-0">
+                                                {{-- Author --}}
+                                                <div class="flex items-center gap-2 mb-1">
+                                                    @if($version->created_by && $version->createdBy)
+                                                        <span class="text-sm font-medium text-gray-900">
+                                                            {{ $version->createdBy->name }}
+                                                        </span>
+                                                    @elseif($version->plan_run_id)
+                                                        <span class="text-sm font-medium text-indigo-600 flex items-center gap-1">
+                                                            <svg class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z"/>
+                                                            </svg>
+                                                            AI Generated
+                                                        </span>
+                                                    @else
+                                                        <span class="text-sm font-medium text-gray-500">Unknown</span>
+                                                    @endif
+
+                                                    @if($currentVersionId === $version->id)
+                                                        <span class="inline-flex items-center px-1.5 py-0.5 rounded text-xs font-medium bg-green-100 text-green-700">
+                                                            Current
+                                                        </span>
+                                                    @endif
+                                                </div>
+
+                                                {{-- Timestamp --}}
+                                                <p
+                                                    class="text-xs text-gray-500"
+                                                    title="{{ $version->created_at->format('F j, Y g:i A') }}"
+                                                >
+                                                    {{ $version->created_at->diffForHumans() }}
+                                                </p>
+
+                                                {{-- Summary --}}
+                                                @if($version->summary)
+                                                    <p class="text-xs text-gray-600 mt-1 line-clamp-2">
+                                                        {{ $version->summary }}
+                                                    </p>
+                                                @endif
+                                            </div>
+                                        </div>
+                                    </button>
+                                @endforeach
+                            </div>
+                        @endif
+                    </div>
+
+                    {{-- Right: Preview & Restore --}}
+                    <div class="flex-1 flex flex-col overflow-hidden bg-white">
+                        @if($selectedVersion)
+                            {{-- Preview Header --}}
+                            <div class="px-6 py-4 bg-gray-50 border-b border-gray-200 flex items-center justify-between">
+                                <div>
+                                    <h3 class="text-sm font-medium text-gray-900">
+                                        Version from {{ $selectedVersion->created_at->format('M j, Y') }} at {{ $selectedVersion->created_at->format('g:i A') }}
+                                    </h3>
+                                    <p class="text-xs text-gray-500 mt-0.5">
+                                        @if($selectedVersion->created_by && $selectedVersion->createdBy)
+                                            By {{ $selectedVersion->createdBy->name }}
+                                        @elseif($selectedVersion->plan_run_id)
+                                            AI Generated
+                                        @endif
+                                    </p>
+                                </div>
+
+                                @if($selectedVersion->id !== $currentVersionId)
+                                    <button
+                                        wire:click="restoreVersion('{{ $selectedVersion->id }}')"
+                                        wire:loading.attr="disabled"
+                                        wire:target="restoreVersion"
+                                        class="px-4 py-2 bg-indigo-600 text-white rounded-lg hover:bg-indigo-700 transition text-sm font-medium flex items-center gap-2 disabled:opacity-50"
+                                    >
+                                        <svg wire:loading.remove wire:target="restoreVersion" class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"/>
+                                        </svg>
+                                        <svg wire:loading wire:target="restoreVersion" class="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
+                                            <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+                                            <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+                                        </svg>
+                                        <span wire:loading.remove wire:target="restoreVersion">Restore This Version</span>
+                                        <span wire:loading wire:target="restoreVersion">Restoring...</span>
+                                    </button>
+                                @else
+                                    <span class="px-4 py-2 bg-gray-100 text-gray-500 rounded-lg text-sm font-medium">
+                                        Current Version
+                                    </span>
+                                @endif
+                            </div>
+
+                            {{-- Preview Content --}}
+                            <div class="flex-1 overflow-y-auto p-6">
+                                <pre class="whitespace-pre-wrap font-mono text-sm text-gray-700 bg-gray-50 p-4 rounded-lg border border-gray-200">{{ $selectedVersion->content_md }}</pre>
+                            </div>
+                        @else
+                            {{-- Empty state --}}
+                            <div class="flex-1 flex items-center justify-center text-gray-400">
+                                <div class="text-center">
+                                    <svg class="w-16 h-16 mx-auto mb-4 text-gray-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z"/>
+                                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z"/>
+                                    </svg>
+                                    <p class="text-sm">Select a version to preview</p>
+                                </div>
+                            </div>
+                        @endif
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+{{-- Toast notification --}}
+<div
+    x-data="{ show: false, message: '' }"
+    @version-restored.window="show = true; message = $event.detail.message; setTimeout(() => show = false, 3000)"
+    x-show="show"
+    x-transition:enter="transition ease-out duration-300"
+    x-transition:enter-start="opacity-0 translate-y-2"
+    x-transition:enter-end="opacity-100 translate-y-0"
+    x-transition:leave="transition ease-in duration-200"
+    x-transition:leave-start="opacity-100 translate-y-0"
+    x-transition:leave-end="opacity-0 translate-y-2"
+    x-cloak
+    class="fixed bottom-4 right-4 flex items-center gap-2 bg-gray-900 text-white px-4 py-3 rounded-lg shadow-lg z-[60]"
+>
+    <svg class="w-5 h-5 text-green-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"/>
+    </svg>
+    <p class="text-sm font-medium" x-text="message"></p>
+</div>
diff --git a/resources/views/livewire/projects/tabs/prd.blade.php b/resources/views/livewire/projects/tabs/prd.blade.php
index ecae9d7..66e1c7c 100644
--- a/resources/views/livewire/projects/tabs/prd.blade.php
+++ b/resources/views/livewire/projects/tabs/prd.blade.php
@@ -8,6 +8,20 @@
             @if($isDirty)
                 <span class="text-sm text-amber-600">Unsaved changes</span>
             @endif
+
+            {{-- Version History Button --}}
+            @if($this->document)
+                <button
+                    wire:click="openVersionHistory"
+                    class="p-2 text-gray-500 hover:text-gray-700 hover:bg-gray-100 rounded-lg transition"
+                    title="Version History"
+                >
+                    <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                    </svg>
+                </button>
+            @endif
+
             <button
                 wire:click="save"
                 @class([
@@ -44,4 +58,14 @@ class="w-full h-full p-4 resize-none border-0 focus:ring-0 font-mono text-sm"
             ></textarea>
         </div>
     @endif
+
+    {{-- Version History Slide-over --}}
+    @if($this->document)
+        <x-version-history-slide-over
+            :versions="$this->versions"
+            :selectedVersion="$this->selectedVersionForPreview"
+            :previewVersionId="$previewVersionId"
+            :currentVersionId="$this->document->current_version_id"
+        />
+    @endif
 </div>
diff --git a/resources/views/livewire/projects/tabs/tech.blade.php b/resources/views/livewire/projects/tabs/tech.blade.php
index d116972..9170505 100644
--- a/resources/views/livewire/projects/tabs/tech.blade.php
+++ b/resources/views/livewire/projects/tabs/tech.blade.php
@@ -8,6 +8,20 @@
             @if($isDirty)
                 <span class="text-sm text-amber-600">Unsaved changes</span>
             @endif
+
+            {{-- Version History Button --}}
+            @if($this->document)
+                <button
+                    wire:click="openVersionHistory"
+                    class="p-2 text-gray-500 hover:text-gray-700 hover:bg-gray-100 rounded-lg transition"
+                    title="Version History"
+                >
+                    <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z"/>
+                    </svg>
+                </button>
+            @endif
+
             <button
                 wire:click="save"
                 @class([
@@ -77,4 +91,14 @@ class="w-full h-full p-4 resize-none border-0 focus:ring-0 font-mono text-sm"
             ></textarea>
         </div>
     @endif
+
+    {{-- Version History Slide-over --}}
+    @if($this->document)
+        <x-version-history-slide-over
+            :versions="$this->versions"
+            :selectedVersion="$this->selectedVersionForPreview"
+            :previewVersionId="$previewVersionId"
+            :currentVersionId="$this->document->current_version_id"
+        />
+    @endif
 </div>
diff --git a/tests/Feature/ExportTest.php b/tests/Feature/ExportTest.php
index 02f691f..284d86d 100644
--- a/tests/Feature/ExportTest.php
+++ b/tests/Feature/ExportTest.php
@@ -9,7 +9,6 @@
 use Illuminate\Support\Facades\Storage;
 
 use function Pest\Laravel\actingAs;
-use function Pest\Laravel\get;
 
 beforeEach(function () {
     Storage::fake('local');
diff --git a/tests/Feature/VersionHistoryTest.php b/tests/Feature/VersionHistoryTest.php
new file mode 100644
index 0000000..9e0e909
--- /dev/null
+++ b/tests/Feature/VersionHistoryTest.php
@@ -0,0 +1,215 @@
+<?php
+
+use App\Models\Document;
+use App\Models\DocumentVersion;
+use App\Models\Project;
+use App\Models\User;
+
+use function Pest\Laravel\actingAs;
+
+beforeEach(function () {
+    $this->user = User::factory()->create();
+    $this->project = Project::factory()->for($this->user)->create();
+});
+
+describe('PRD Version History', function () {
+    beforeEach(function () {
+        $this->document = Document::factory()
+            ->prd()
+            ->for($this->project)
+            ->create();
+
+        $this->version1 = DocumentVersion::factory()
+            ->for($this->document, 'document')
+            ->withContent('# Version 1 Content')
+            ->create(['created_by' => $this->user->id]);
+
+        $this->version2 = DocumentVersion::factory()
+            ->for($this->document, 'document')
+            ->withContent('# Version 2 Content')
+            ->create(['created_by' => $this->user->id]);
+
+        $this->document->update(['current_version_id' => $this->version2->id]);
+    });
+
+    it('loads versions for the document', function () {
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Prd::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component->assertSet('showVersionHistory', false);
+
+        // Access computed property through the instance
+        $instance = $component->instance();
+        $versions = $instance->versions;
+
+        expect($versions)->toHaveCount(2);
+        expect($versions->first()->id)->toBe($this->version2->id);
+    });
+
+    it('opens and closes version history panel', function () {
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Prd::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component
+            ->assertSet('showVersionHistory', false)
+            ->call('openVersionHistory')
+            ->assertSet('showVersionHistory', true)
+            ->call('closeVersionHistory')
+            ->assertSet('showVersionHistory', false);
+    });
+
+    it('selects a version for preview', function () {
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Prd::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component
+            ->call('openVersionHistory')
+            ->call('selectVersion', $this->version1->id)
+            ->assertSet('previewVersionId', $this->version1->id);
+
+        $instance = $component->instance();
+        $selectedVersion = $instance->selectedVersionForPreview;
+        expect($selectedVersion->id)->toBe($this->version1->id);
+        expect($selectedVersion->content_md)->toBe('# Version 1 Content');
+    });
+
+    it('restores an old version by creating a new version', function () {
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Prd::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component
+            ->call('openVersionHistory')
+            ->call('restoreVersion', $this->version1->id);
+
+        // Should have 3 versions now (original 2 + restored)
+        $this->document->refresh();
+        expect($this->document->versions()->count())->toBe(3);
+
+        // Current version should be the new one
+        $currentVersion = $this->document->currentVersion;
+        expect($currentVersion->content_md)->toBe('# Version 1 Content');
+        expect($currentVersion->summary)->toContain('Restored from');
+
+        // Panel should be closed
+        $component->assertSet('showVersionHistory', false);
+    });
+
+    it('dispatches events after restore', function () {
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Prd::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component
+            ->call('restoreVersion', $this->version1->id)
+            ->assertDispatched('docUpdated', type: 'prd')
+            ->assertDispatched('version-restored');
+    });
+});
+
+describe('Tech Spec Version History', function () {
+    beforeEach(function () {
+        $this->document = Document::factory()
+            ->tech()
+            ->for($this->project)
+            ->create();
+
+        $this->version1 = DocumentVersion::factory()
+            ->for($this->document, 'document')
+            ->withContent('# Tech Version 1')
+            ->create(['created_by' => $this->user->id]);
+
+        $this->document->update(['current_version_id' => $this->version1->id]);
+    });
+
+    it('works the same as PRD version history', function () {
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Tech::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component
+            ->assertSet('showVersionHistory', false)
+            ->call('openVersionHistory')
+            ->assertSet('showVersionHistory', true);
+
+        $instance = $component->instance();
+        $versions = $instance->versions;
+        expect($versions)->toHaveCount(1);
+    });
+
+    it('dispatches tech type in events', function () {
+        actingAs($this->user);
+
+        // Create a second version to restore from
+        $version2 = DocumentVersion::factory()
+            ->for($this->document, 'document')
+            ->withContent('# Tech Version 2')
+            ->create(['created_by' => $this->user->id]);
+
+        $this->document->update(['current_version_id' => $version2->id]);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Tech::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        $component
+            ->call('restoreVersion', $this->version1->id)
+            ->assertDispatched('docUpdated', type: 'tech');
+    });
+});
+
+describe('Version History Security', function () {
+    it('cannot restore version from different document', function () {
+        // Create a different project with its own PRD
+        $otherProject = Project::factory()->for($this->user)->create();
+        $otherDocument = Document::factory()
+            ->prd()
+            ->for($otherProject)
+            ->create();
+
+        $otherVersion = DocumentVersion::factory()
+            ->for($otherDocument, 'document')
+            ->withContent('# Other Document Content')
+            ->create();
+
+        // Create PRD for our project
+        $document = Document::factory()
+            ->prd()
+            ->for($this->project)
+            ->create();
+
+        $version = DocumentVersion::factory()
+            ->for($document, 'document')
+            ->withContent('# My Content')
+            ->create();
+
+        $document->update(['current_version_id' => $version->id]);
+
+        actingAs($this->user);
+
+        $component = Livewire\Livewire::test(\App\Livewire\Projects\Tabs\Prd::class, [
+            'projectId' => $this->project->id,
+        ]);
+
+        // Try to restore version from different document - should not work
+        $component->call('restoreVersion', $otherVersion->id);
+
+        // Document should still only have 1 version
+        expect($document->versions()->count())->toBe(1);
+    });
+});
diff --git a/vite.config.js b/vite.config.js
index 29fbfe9..c1f195e 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -5,7 +5,11 @@ import tailwindcss from '@tailwindcss/vite';
 export default defineConfig({
     plugins: [
         laravel({
-            input: ['resources/css/app.css', 'resources/js/app.js'],
+            input: [
+                'resources/css/app.css',
+                'resources/js/app.js',
+                'resources/css/filament/admin/theme.css',
+            ],
             refresh: true,
         }),
         tailwindcss(),