diff --git a/resources/views/admin/platform_orders/index.blade.php b/resources/views/admin/platform_orders/index.blade.php
index d1edb46..931752f 100644
--- a/resources/views/admin/platform_orders/index.blade.php
+++ b/resources/views/admin/platform_orders/index.blade.php
@@ -1144,7 +1144,7 @@
                                 $subBack = $selfWithoutBack;
                                 $subLink = '/admin/site-subscriptions/' . $order->siteSubscription->id . '?' . \Illuminate\Support\Arr::query(['back' => $subBack]);
                             @endphp
-                            <a href="{!! $subLink !!}">{{ $order->siteSubscription->subscription_no }}</a>
+                            <a class="link" href="{!! $subLink !!}">{{ $order->siteSubscription->subscription_no }}</a>
                         </div>
                         <div class="muted muted-xs">
                             订阅ID：<a href="{!! $safeFullUrlWithQuery(['site_subscription_id' => $order->siteSubscription->id, 'page' => null]) !!}" class="muted muted-xs">{{ $order->siteSubscription->id }}</a>
diff --git a/tests/Feature/AdminPlatformOrderIndexSubscriptionNoLinkHasLinkClassTest.php b/tests/Feature/AdminPlatformOrderIndexSubscriptionNoLinkHasLinkClassTest.php
new file mode 100644
index 0000000..4ecc01c
--- /dev/null
+++ b/tests/Feature/AdminPlatformOrderIndexSubscriptionNoLinkHasLinkClassTest.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Merchant;
+use App\Models\Plan;
+use App\Models\PlatformOrder;
+use App\Models\SiteSubscription;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Arr;
+use Tests\TestCase;
+
+class AdminPlatformOrderIndexSubscriptionNoLinkHasLinkClassTest extends TestCase
+{
+    use RefreshDatabase;
+
+    protected function loginAsPlatformAdmin(): void
+    {
+        $this->seed();
+
+        $this->post('/admin/login', [
+            'email' => 'platform.admin@demo.local',
+            'password' => 'Platform@123456',
+        ])->assertRedirect('/admin');
+    }
+
+    public function test_subscription_no_link_uses_link_class_and_keeps_back_context(): void
+    {
+        $this->loginAsPlatformAdmin();
+
+        $merchant = Merchant::query()->firstOrFail();
+
+        $plan = Plan::query()->create([
+            'code' => 'po_index_sub_link_class_plan',
+            'name' => '平台订单列表订阅号链接样式测试套餐',
+            'billing_cycle' => 'monthly',
+            'price' => 10,
+            'list_price' => 10,
+            'status' => 'active',
+            'sort' => 10,
+            'published_at' => now(),
+        ]);
+
+        $sub = SiteSubscription::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'status' => 'active',
+            'source' => 'test',
+            'subscription_no' => 'SS_LINK_CLASS_0001',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'amount' => 10,
+            'starts_at' => now(),
+            'ends_at' => now()->addMonth(),
+        ]);
+
+        PlatformOrder::query()->create([
+            'merchant_id' => $merchant->id,
+            'plan_id' => $plan->id,
+            'site_subscription_id' => $sub->id,
+            'order_no' => 'PO_INDEX_SUB_LINK_CLASS_0001',
+            'order_type' => 'renewal',
+            'status' => 'activated',
+            'payment_status' => 'paid',
+            'plan_name' => $plan->name,
+            'billing_cycle' => $plan->billing_cycle,
+            'period_months' => 1,
+            'quantity' => 1,
+            'payable_amount' => 10,
+            'paid_amount' => 10,
+            'placed_at' => now(),
+            'paid_at' => now(),
+            'activated_at' => now(),
+            'meta' => [],
+        ]);
+
+        $res = $this->get('/admin/platform-orders?status=activated');
+        $res->assertOk();
+
+        $indexSelfWithoutBack = '/admin/platform-orders?' . Arr::query([
+            'status' => 'activated',
+        ]);
+
+        $subLink = '/admin/site-subscriptions/' . $sub->id . '?' . Arr::query([
+            'back' => $indexSelfWithoutBack,
+        ]);
+
+        // 订阅号链接必须带 link class（样式统一）
+        $res->assertSee('<a class="link" href="' . $subLink . '">' . $sub->subscription_no . '</a>', false);
+    }
+}