diff --git a/app/Http/Controllers/Mobile/CourseController.php b/app/Http/Controllers/Mobile/CourseController.php
index d632434..50ecf93 100755
--- a/app/Http/Controllers/Mobile/CourseController.php
+++ b/app/Http/Controllers/Mobile/CourseController.php
@@ -22,8 +22,10 @@ use App\Models\CourseSign;
 use App\Models\CourseType;
 use App\Models\Notice;
 use App\Models\Order;
+use App\Http\Resources\Mobile\PublicCourseResource;
 use App\Http\Resources\Mobile\UserListResource;
 use App\Models\User;
+use App\Models\Upload;
 use App\Services\SchoolmateAccessService;
 use EasyWeChat\Factory;
 use Illuminate\Support\Carbon;
@@ -75,18 +77,36 @@ class CourseController extends CommonController
     public function course()
     {
         $all = request()->all();
-        $list = Course::with('image', 'typeDetail')->withCount('courseSigns')->where(function ($query) use ($all) {
-            if (isset($all['type'])) {
-                $query->where('type', $all['type']);
-            }
-            if (isset($all['status'])) {
-                $query->where('status', $all['status']);
-            }
-        })->whereIn('sign_status', [10, 40])
+        $validator = Validator::make($all, [
+            'page_size' => 'nullable|integer|min:1|max:50',
+            'page' => 'nullable|integer|min:1',
+            'type' => 'nullable|integer',
+            'status' => 'nullable|integer|in:1',
+        ], [
+            'page_size.max' => '每页最多查询50条课程',
+            'status.in' => '课程状态参数无效',
+        ]);
+        if ($validator->fails()) {
+            return $this->fail([ResponseCode::ERROR_PARAMETER, implode(',', $validator->errors()->all())]);
+        }
+
+        $list = Course::with('image', 'typeDetail', 'teacher')
+            ->withCount('courseSigns')
+            ->where('status', 1)
+            ->whereIn('sign_status', [10, 40])
             ->where('is_virtual', 0)
+            ->where(function ($query) use ($all) {
+                if (isset($all['type'])) {
+                    $query->where('type', $all['type']);
+                }
+            })
             ->orderBy('sign_status', 'asc')
             ->orderBy('start_date', 'desc')
-            ->paginate($all['page_size'] ?? 20);
+            ->paginate((int) ($all['page_size'] ?? 20));
+        $list->setCollection($list->getCollection()->map(function ($course) {
+            return (new PublicCourseResource($course))->resolve();
+        }));
+
         return $this->success($list);
     }
 
@@ -109,29 +129,30 @@ class CourseController extends CommonController
             'course_id.required' => '课程id必填',
         ];
         $validator = Validator::make($all, [
-            'course_id' => 'required'
+            'course_id' => 'required|integer|min:1'
         ], $messages);
         if ($validator->fails()) {
             return $this->fail([ResponseCode::ERROR_PARAMETER, implode(',', $validator->errors()->all())]);
         }
         $detail = Course::with([
+            'image',
             'qunImage',
             'typeDetail',
             'courseForms',
             'teacher',
-            'courseContentEvaluation' => function ($query) {
-                $query->with([
-                    'courseContentEvaluationAsks' => function ($q) {
-                        $q->orderBy('sort', 'asc');
-                    }
-                ]);
-            }
         ])->withCount([
-                    'courseSigns as my_user' => function ($query) {
-                        $query->where('user_id', $this->getUserId());
-                    }
-                ])->find($all['course_id']);
-        return $this->success($detail);
+            'courseSigns as my_user' => function ($query) {
+                $query->where('user_id', $this->getUserId());
+            }
+        ])->where('status', 1)
+            ->whereIn('sign_status', [10, 40])
+            ->where('is_virtual', 0)
+            ->find($all['course_id']);
+        if (!$detail) {
+            return response()->json(['message' => '课程不存在'], 404);
+        }
+        $this->attachPublicAssets($detail);
+        return $this->success((new PublicCourseResource($detail))->resolve());
     }
 
     /**
@@ -186,13 +207,34 @@ class CourseController extends CommonController
             'course_id.required' => '课程id必填',
         ];
         $validator = Validator::make($all, [
-            'course_id' => 'required'
+            'course_id' => 'required|integer|min:1'
         ], $messages);
         if ($validator->fails()) {
             return $this->fail([ResponseCode::ERROR_PARAMETER, implode(',', $validator->errors()->all())]);
         }
-        $detail = Course::with('typeDetail', 'courseForms', 'teacher')->find($all['course_id']);
-        return $this->success($detail);
+        $detail = Course::with('typeDetail', 'courseForms', 'teacher', 'image', 'qunImage')
+            ->where('status', 1)
+            ->whereIn('sign_status', [10, 40])
+            ->where('is_virtual', 0)
+            ->find($all['course_id']);
+        if (!$detail) {
+            return response()->json(['message' => '课程不存在'], 404);
+        }
+        $this->attachPublicAssets($detail);
+        return $this->success((new PublicCourseResource($detail))->resolve());
+    }
+
+    private function attachPublicAssets(Course $course): void
+    {
+        $ids = collect($course->publicize_ids ?: [])
+            ->filter(fn ($id) => is_numeric($id) && (int) $id > 0)
+            ->map(fn ($id) => (int) $id)
+            ->values();
+
+        $course->setRelation(
+            'publicAssets',
+            $ids->isEmpty() ? collect() : Upload::whereIn('id', $ids->all())->get()
+        );
     }
 
     /**
diff --git a/app/Http/Resources/Mobile/AdminCourseResource.php b/app/Http/Resources/Mobile/AdminCourseResource.php
new file mode 100644
index 0000000..658d3ff
--- /dev/null
+++ b/app/Http/Resources/Mobile/AdminCourseResource.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Resources\Mobile;
+
+/**
+ * Explicit internal representation for a future authorized admin API.
+ * Public mobile endpoints must never use this resource.
+ */
+class AdminCourseResource extends PublicCourseResource
+{
+    public function toArray($request)
+    {
+        $data = parent::toArray($request);
+        $data['admin_id'] = $this->admin_id;
+        $data['department_id'] = $this->department_id;
+        $data['teacher_id'] = $this->teacher_id;
+        $data['is_virtual'] = (bool) $this->is_virtual;
+        $data['show_txl'] = (bool) $this->show_txl;
+        $data['show_mobile'] = (bool) $this->show_mobile;
+
+        return $data;
+    }
+}
diff --git a/app/Http/Resources/Mobile/AuthenticatedCourseResource.php b/app/Http/Resources/Mobile/AuthenticatedCourseResource.php
new file mode 100644
index 0000000..e6c6591
--- /dev/null
+++ b/app/Http/Resources/Mobile/AuthenticatedCourseResource.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Http\Resources\Mobile;
+
+/**
+ * Authenticated mobile representation.
+ *
+ * This is intentionally not used by the anonymous endpoints until optional
+ * mobile authentication is explicitly enabled and tested. It documents the
+ * boundary for future authenticated course APIs.
+ */
+class AuthenticatedCourseResource extends PublicCourseResource
+{
+    public function toArray($request)
+    {
+        $data = parent::toArray($request);
+        $data['my_user'] = $this->when(
+            isset($this->my_user),
+            (int) $this->my_user
+        );
+
+        return $data;
+    }
+}
diff --git a/app/Http/Resources/Mobile/PublicCourseResource.php b/app/Http/Resources/Mobile/PublicCourseResource.php
new file mode 100644
index 0000000..2a70f1f
--- /dev/null
+++ b/app/Http/Resources/Mobile/PublicCourseResource.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace App\Http\Resources\Mobile;
+
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * Public representation of a course.
+ *
+ * Do not return Course models directly from public mobile endpoints. Course
+ * has computed appends and relations that contain internal and personal data.
+ */
+class PublicCourseResource extends JsonResource
+{
+    public function toArray($request)
+    {
+        $course = $this->resource;
+
+        return [
+            'id' => (int) $this->id,
+            'name' => $this->name,
+            'start_date' => $this->start_date,
+            'end_date' => $this->end_date,
+            'content' => $this->content,
+            'publicize_content' => $this->publicize_content,
+            'type' => $this->type === null ? null : (int) $this->type,
+            'is_fee' => $this->is_fee === null ? null : (int) $this->is_fee,
+            'total' => $this->total === null ? null : (int) $this->total,
+            'show_txl' => $this->show_txl === null ? null : (int) $this->show_txl,
+            'show_mobile' => $this->show_mobile === null ? null : (int) $this->show_mobile,
+            'url' => $this->url,
+            'url_title' => $this->url_title,
+            'status' => (int) $this->status,
+            'course_status' => (int) $this->course_status,
+            'sign_status' => (int) $this->sign_status,
+            'my_user' => isset($this->my_user) ? (int) $this->my_user : 0,
+            'type_detail' => $this->whenLoaded('typeDetail', function () {
+                if (!$this->typeDetail) {
+                    return null;
+                }
+
+                return [
+                    'id' => (int) $this->typeDetail->id,
+                    'name' => $this->typeDetail->name,
+                ];
+            }),
+            'image' => $this->whenLoaded('image', function () {
+                if (!$this->image) {
+                    return null;
+                }
+
+                return [
+                    'id' => (int) $this->image->id,
+                    'url' => $this->image->url,
+                ];
+            }),
+            'qun_image_id' => $this->qun_image_id === null ? null : (int) $this->qun_image_id,
+            'qun_image' => $this->whenLoaded('qunImage', function () {
+                return $this->safeUpload($this->qunImage);
+            }),
+            'publicize' => $course->relationLoaded('publicAssets')
+                ? $course->getRelation('publicAssets')->map(fn ($upload) => $this->safeUpload($upload))->values()->all()
+                : [],
+            'teacher' => $this->whenLoaded('teacher', function () {
+                if (!$this->teacher) {
+                    return null;
+                }
+
+                return [
+                    'id' => (int) $this->teacher->id,
+                    'name' => $this->teacher->name,
+                    'introduce' => $this->teacher->introduce,
+                ];
+            }),
+            'course_forms' => $this->whenLoaded('courseForms', function () {
+                return $this->courseForms->map(function ($form) {
+                    // Keep only fields needed to render the public sign-up form.
+                    return [
+                        'id' => (int) $form->id,
+                        'name' => $form->name,
+                        'field' => $form->field,
+                        'edit_input' => $form->edit_input,
+                        'rule' => $form->rule,
+                        'sort' => (int) $form->sort,
+                        'help' => $form->help,
+                        'select_item' => $form->select_item,
+                        'need_fill' => (bool) $form->need_fill,
+                        'belong_user' => (bool) $form->belong_user,
+                    ];
+                })->values()->all();
+            }),
+            'course_signs_count' => $this->when(
+                isset($this->course_signs_count),
+                (int) $this->course_signs_count
+            ),
+        ];
+    }
+
+    private function safeUpload($upload): ?array
+    {
+        if (!$upload) {
+            return null;
+        }
+
+        return [
+            'id' => (int) $upload->id,
+            'url' => $upload->url,
+        ];
+    }
+}
diff --git a/public/.DS_Store b/public/.DS_Store
new file mode 100644
index 0000000..046e7fc
Binary files /dev/null and b/public/.DS_Store differ
diff --git a/scripts/vuln01_regression.sh b/scripts/vuln01_regression.sh
new file mode 100755
index 0000000..179a59a
--- /dev/null
+++ b/scripts/vuln01_regression.sh
@@ -0,0 +1,117 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+BASE_URL="${BASE_URL:-https://wx.sstbc.com}"
+COURSE_ID="${COURSE_ID:-}"
+CURL_TIMEOUT="${CURL_TIMEOUT:-20}"
+CURL_RESOLVE="${CURL_RESOLVE:-}"
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "$TMP_DIR"' EXIT
+
+if ! command -v php >/dev/null 2>&1; then
+    printf 'ERROR: php CLI is required to parse API responses\n' >&2
+    exit 2
+fi
+
+CURL_ARGS=(-sS -L --max-time "$CURL_TIMEOUT")
+if [[ "${CURL_INSECURE:-0}" == "1" ]]; then
+    CURL_ARGS+=(-k)
+fi
+if [[ -n "$CURL_RESOLVE" ]]; then
+    CURL_ARGS+=(--resolve "$CURL_RESOLVE")
+fi
+
+request() {
+    local name="$1"
+    local url="$2"
+    local body="$TMP_DIR/$name.json"
+    local status
+
+    if ! status="$(curl "${CURL_ARGS[@]}" -o "$body" -w '%{http_code}' "$url")"; then
+        status="000"
+        : > "$body"
+        printf '%s' "$status" > "$TMP_DIR/$name.status"
+        printf '%-28s HTTP %s REQUEST_FAILED\n' "$name" "$status"
+        printf '%s\n' "$body"
+        return 0
+    fi
+    printf '%s' "$status" > "$TMP_DIR/$name.status"
+    printf '%-28s HTTP %s\n' "$name" "$status"
+    printf '%s\n' "$body"
+}
+
+request course-list "$BASE_URL/api/mobile/course/course?page=1&page_size=1"
+request course-list-page-size-51 "$BASE_URL/api/mobile/course/course?page=1&page_size=51"
+request course-detail-invalid "$BASE_URL/api/mobile/course/course-detail?course_id=not-an-id"
+request course-detail-missing "$BASE_URL/api/mobile/course/course-detail?course_id=2147483647"
+
+scan_sensitive_keys() {
+    local name="$1"
+    local body="$TMP_DIR/$name.json"
+    local forbidden
+
+    forbidden="$(php -r '
+        $data = json_decode(file_get_contents($argv[1]), true);
+        if (!is_array($data)) { exit(2); }
+        $blocked = ["mobile", "idcard", "id_card", "identity_card", "remark", "admin_id", "department_id", "teacher_id", "deleted_at", "password", "remember_token"];
+        $found = [];
+        $walk = function ($value) use (&$walk, &$found, $blocked) {
+            if (!is_array($value)) { return; }
+            foreach ($value as $key => $child) {
+                if (in_array(strtolower((string) $key), $blocked, true)) { $found[(string) $key] = true; }
+                $walk($child);
+            }
+        };
+        $walk($data);
+        ksort($found);
+        echo implode(PHP_EOL, array_keys($found));
+    ' "$body" || true)"
+    if [[ -n "$forbidden" ]]; then
+        printf '%s FORBIDDEN_KEYS\n%s\n' "$name" "$forbidden"
+        exit 1
+    fi
+    printf '%s SENSITIVE_SCAN PASS\n' "$name"
+}
+
+list_body="$TMP_DIR/course-list.json"
+if php -r '$d=json_decode(file_get_contents($argv[1]), true); exit(is_array($d) && isset($d["data"]) && is_array($d["data"]) ? 0 : 1);' "$list_body"; then
+    scan_sensitive_keys course-list
+    if [[ -z "$COURSE_ID" ]]; then
+        COURSE_ID="$(php -r '$d=json_decode(file_get_contents($argv[1]), true); echo $d["data"][0]["id"] ?? "";' "$list_body")"
+    fi
+
+    if [[ -n "$COURSE_ID" ]]; then
+        request course-detail-valid "$BASE_URL/api/mobile/course/course-detail?course_id=$COURSE_ID"
+        request course-detail-pc-valid "$BASE_URL/api/mobile/course/course-detail-pc?course_id=$COURSE_ID"
+        scan_sensitive_keys course-detail-valid
+        scan_sensitive_keys course-detail-pc-valid
+        php -r '$d=json_decode(file_get_contents($argv[1]), true); exit(is_array($d) && isset($d["id"], $d["name"]) ? 0 : 1);' "$TMP_DIR/course-detail-valid.json"
+        php -r '$d=json_decode(file_get_contents($argv[1]), true); exit(is_array($d) && isset($d["id"], $d["name"]) ? 0 : 1);' "$TMP_DIR/course-detail-pc-valid.json"
+        printf 'DETAIL_CORE_FIELDS PASS\n'
+    else
+        printf 'DETAIL_SCAN SKIP: course list is empty\n'
+    fi
+else
+    printf 'SENSITIVE_SCAN SKIP: course list did not return a data array\n'
+fi
+
+if php -r '$d=json_decode(file_get_contents($argv[1]), true); exit(is_array($d) && (($d["errcode"] ?? null) === 10001) ? 0 : 1);' "$TMP_DIR/course-list-page-size-51.json"; then
+    printf 'PAGE_SIZE_VALIDATION PASS\n'
+else
+    printf 'PAGE_SIZE_VALIDATION FAIL\n'
+    exit 1
+fi
+
+if php -r '$d=json_decode(file_get_contents($argv[1]), true); exit(is_array($d) && (($d["errcode"] ?? null) === 10001) ? 0 : 1);' "$TMP_DIR/course-detail-invalid.json"; then
+    printf 'COURSE_ID_VALIDATION PASS\n'
+else
+    printf 'COURSE_ID_VALIDATION FAIL\n'
+    exit 1
+fi
+
+if [[ "$(cat "$TMP_DIR/course-detail-missing.status")" == "404" ]] || php -r '$d=json_decode(file_get_contents($argv[1]), true); exit(is_array($d) && (($d["message"] ?? null) === "课程不存在") ? 0 : 1);' "$TMP_DIR/course-detail-missing.json"; then
+    printf 'MISSING_COURSE_VALIDATION PASS\n'
+else
+    printf 'MISSING_COURSE_VALIDATION FAIL\n'
+    exit 1
+fi
diff --git a/tests/Feature/MobileCourseEndpointValidationTest.php b/tests/Feature/MobileCourseEndpointValidationTest.php
new file mode 100644
index 0000000..65462f3
--- /dev/null
+++ b/tests/Feature/MobileCourseEndpointValidationTest.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+
+class MobileCourseEndpointValidationTest extends TestCase
+{
+    public function test_course_list_rejects_page_size_above_public_limit(): void
+    {
+        $response = $this->getJson('/api/mobile/course/course?page_size=51');
+
+        $response->assertOk()
+            ->assertJsonPath('errcode', 10001);
+    }
+
+    public function test_course_list_rejects_non_public_status_filter(): void
+    {
+        $response = $this->getJson('/api/mobile/course/course?status=0');
+
+        $response->assertOk()
+            ->assertJsonPath('errcode', 10001);
+    }
+
+    public function test_course_detail_rejects_non_integer_course_id(): void
+    {
+        $response = $this->getJson('/api/mobile/course/course-detail?course_id=not-an-id');
+
+        $response->assertOk()
+            ->assertJsonPath('errcode', 10001);
+    }
+
+    public function test_pc_course_detail_rejects_non_integer_course_id(): void
+    {
+        $response = $this->getJson('/api/mobile/course/course-detail-pc?course_id=not-an-id');
+
+        $response->assertOk()
+            ->assertJsonPath('errcode', 10001);
+    }
+}
diff --git a/tests/Feature/MobileCoursePublicDataTest.php b/tests/Feature/MobileCoursePublicDataTest.php
new file mode 100644
index 0000000..78a7488
--- /dev/null
+++ b/tests/Feature/MobileCoursePublicDataTest.php
@@ -0,0 +1,292 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Admin;
+use App\Models\User;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+use Tests\TestCase;
+
+class MobileCoursePublicDataTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        config([
+            'database.default' => 'sqlite',
+            'database.connections.sqlite.database' => ':memory:',
+        ]);
+        DB::purge('sqlite');
+        $this->createSchema();
+        $this->seedCourseData();
+    }
+
+    protected function tearDown(): void
+    {
+        Auth::guard('mobile')->forgetUser();
+        Auth::guard('admin')->forgetUser();
+        DB::disconnect('sqlite');
+
+        parent::tearDown();
+    }
+
+    public function test_anonymous_user_sees_only_published_public_courses(): void
+    {
+        $response = $this->getJson('/api/mobile/course/course');
+
+        $response->assertOk();
+        $data = $response->json('data');
+        $this->assertNoSensitiveKeys($response->json());
+
+        $this->assertCount(1, $data);
+        $this->assertSame(150, $data[0]['id']);
+        $this->assertSame('张老师', $data[0]['teacher']['name']);
+        $this->assertArrayNotHasKey('mobile', $data[0]['teacher']);
+        $this->assertArrayNotHasKey('admin_id', $data[0]);
+    }
+
+    public function test_regular_mobile_user_cannot_read_unpublished_course_details(): void
+    {
+        $user = new User();
+        $user->forceFill(['id' => 200]);
+        Auth::guard('mobile')->setUser($user);
+
+        $response = $this->getJson('/api/mobile/course/course-detail?course_id=151');
+
+        $response->assertNotFound();
+    }
+
+    public function test_registered_mobile_user_still_receives_safe_course_detail(): void
+    {
+        $user = new User();
+        $user->forceFill(['id' => 201]);
+        Auth::guard('mobile')->setUser($user);
+        DB::table('course_signs')->insert([
+            'id' => 1,
+            'course_id' => 150,
+            'user_id' => 201,
+        ]);
+
+        $response = $this->getJson('/api/mobile/course/course-detail?course_id=150');
+
+        $response->assertOk();
+        $this->assertNoSensitiveKeys($response->json());
+        $this->assertSame('公开课程', $response->json('name'));
+        $this->assertSame('张老师', $response->json('teacher.name'));
+        $this->assertStringEndsWith('/course/public.jpg', $response->json('publicize.0.url'));
+        $this->assertStringEndsWith('/course/group.jpg', $response->json('qun_image.url'));
+        $this->assertArrayNotHasKey('folder', $response->json('publicize.0'));
+        $this->assertArrayNotHasKey('name', $response->json('qun_image'));
+        $this->assertArrayNotHasKey('mobile', $response->json('teacher'));
+        $this->assertArrayNotHasKey('admin_id', $response->json());
+        $this->assertArrayNotHasKey('department_id', $response->json());
+        $this->assertArrayNotHasKey('deleted_at', $response->json());
+        $this->assertArrayNotHasKey('admin_id', $response->json('course_forms.0'));
+    }
+
+    public function test_admin_user_does_not_expand_public_mobile_response(): void
+    {
+        $admin = new Admin();
+        $admin->forceFill(['id' => 1]);
+        Auth::guard('admin')->setUser($admin);
+
+        $response = $this->getJson('/api/mobile/course/course-detail-pc?course_id=150');
+
+        $response->assertOk();
+        $this->assertNoSensitiveKeys($response->json());
+        $this->assertArrayNotHasKey('mobile', $response->json('teacher'));
+        $this->assertArrayNotHasKey('admin_id', $response->json());
+        $this->assertArrayNotHasKey('teacher_id', $response->json());
+    }
+
+    public function test_deleted_virtual_and_not_started_courses_are_not_publicly_addressable(): void
+    {
+        foreach ([152, 153, 154] as $courseId) {
+            $response = $this->getJson('/api/mobile/course/course-detail?course_id=' . $courseId);
+
+            $response->assertNotFound();
+        }
+    }
+
+    private function createSchema(): void
+    {
+        Schema::create('courses', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('admin_id')->nullable();
+            $table->integer('department_id')->nullable();
+            $table->string('name')->nullable();
+            $table->integer('image_id')->nullable();
+            $table->integer('qun_image_id')->nullable();
+            $table->date('start_date')->nullable();
+            $table->date('end_date')->nullable();
+            $table->integer('type')->nullable();
+            $table->text('content')->nullable();
+            $table->text('publicize_content')->nullable();
+            $table->json('publicize_ids')->nullable();
+            $table->tinyInteger('is_fee')->nullable();
+            $table->integer('total')->nullable();
+            $table->string('url')->nullable();
+            $table->string('url_title')->nullable();
+            $table->integer('teacher_id')->nullable();
+            $table->tinyInteger('status')->default(0);
+            $table->tinyInteger('course_status')->default(0);
+            $table->tinyInteger('sign_status')->default(0);
+            $table->boolean('is_virtual')->default(0);
+            $table->boolean('show_txl')->default(1);
+            $table->boolean('show_mobile')->default(1);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('teachers', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('name')->nullable();
+            $table->string('mobile')->nullable();
+            $table->text('introduce')->nullable();
+            $table->string('remark')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('course_types', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('name')->nullable();
+            $table->string('wait_tip')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('course_forms', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('course_id')->nullable();
+            $table->integer('admin_id')->nullable();
+            $table->integer('department_id')->nullable();
+            $table->string('name')->nullable();
+            $table->string('field')->nullable();
+            $table->string('edit_input')->nullable();
+            $table->string('rule')->nullable();
+            $table->integer('sort')->default(1);
+            $table->string('help')->nullable();
+            $table->text('select_item')->nullable();
+            $table->boolean('need_fill')->default(0);
+            $table->boolean('belong_user')->default(0);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('uploads', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('folder')->nullable();
+            $table->string('name')->nullable();
+            $table->string('original_name')->nullable();
+            $table->timestamps();
+        });
+
+        DB::table('uploads')->insert([
+            ['id' => 21, 'folder' => 'course', 'name' => 'public.jpg'],
+            ['id' => 22, 'folder' => 'course', 'name' => 'group.jpg'],
+        ]);
+
+        Schema::create('course_signs', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('course_id')->nullable();
+            $table->integer('user_id')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('course_content_evaluations', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('course_id')->nullable();
+            $table->string('course_content_id')->nullable();
+            $table->timestamps();
+            $table->softDeletes();
+        });
+
+        Schema::create('course_content_evaluation_asks', function (Blueprint $table) {
+            $table->increments('id');
+            $table->integer('course_content_evaluation_id')->nullable();
+            $table->integer('course_content_id')->nullable();
+            $table->integer('sort')->default(1);
+            $table->timestamps();
+            $table->softDeletes();
+        });
+    }
+
+    private function seedCourseData(): void
+    {
+        DB::table('teachers')->insert([
+            'id' => 11,
+            'name' => '张老师',
+            'mobile' => '13800138000',
+            'introduce' => '公开介绍',
+            'remark' => '内部备注',
+        ]);
+        DB::table('course_types')->insert(['id' => 3, 'name' => '管理类']);
+        DB::table('course_forms')->insert([
+            'id' => 1,
+            'course_id' => 150,
+            'admin_id' => 9,
+            'department_id' => 10,
+            'name' => '姓名',
+            'field' => 'name',
+            'edit_input' => 'input',
+            'rule' => 'required',
+            'sort' => 1,
+            'help' => '请填写姓名',
+            'need_fill' => 1,
+            'belong_user' => 1,
+        ]);
+
+        $base = [
+            'name' => '公开课程',
+            'start_date' => '2026-08-01',
+            'end_date' => '2026-08-02',
+            'type' => 3,
+            'content' => '公开介绍',
+            'publicize_content' => '宣传介绍',
+            'teacher_id' => 11,
+            'status' => 1,
+            'course_status' => 20,
+            'sign_status' => 10,
+            'is_virtual' => 0,
+            'show_txl' => 1,
+            'show_mobile' => 1,
+            'is_fee' => 0,
+            'total' => 30,
+            'url' => 'https://example.test/review',
+            'url_title' => '精彩回顾',
+            'publicize_ids' => json_encode([21]),
+            'qun_image_id' => 22,
+            'deleted_at' => null,
+        ];
+
+        DB::table('courses')->insert([
+            array_merge($base, ['id' => 150]),
+            array_merge($base, ['id' => 151, 'status' => 0]),
+            array_merge($base, ['id' => 152, 'is_virtual' => 1]),
+            array_merge($base, ['id' => 153, 'sign_status' => 30]),
+            array_merge($base, ['id' => 154, 'deleted_at' => now()]),
+        ]);
+    }
+
+    private function assertNoSensitiveKeys($value): void
+    {
+        $forbidden = [
+            'mobile', 'idcard', 'id_card', 'identity_card', 'remark',
+            'admin_id', 'department_id', 'teacher_id', 'deleted_at',
+            'password', 'remember_token',
+        ];
+
+        if (is_array($value)) {
+            foreach ($value as $key => $item) {
+                $this->assertNotContains(strtolower((string) $key), $forbidden);
+                $this->assertNoSensitiveKeys($item);
+            }
+        }
+    }
+}
diff --git a/tests/Unit/Http/Resources/Mobile/PublicCourseResourceTest.php b/tests/Unit/Http/Resources/Mobile/PublicCourseResourceTest.php
new file mode 100644
index 0000000..0f4b1fb
--- /dev/null
+++ b/tests/Unit/Http/Resources/Mobile/PublicCourseResourceTest.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace Tests\Unit\Http\Resources\Mobile;
+
+use App\Http\Resources\Mobile\PublicCourseResource;
+use App\Models\Course;
+use App\Models\CourseForm;
+use App\Models\CourseType;
+use App\Models\Teacher;
+use Illuminate\Support\Collection;
+use Tests\TestCase;
+
+class PublicCourseResourceTest extends TestCase
+{
+    public function test_public_resource_returns_only_allowlisted_course_fields(): void
+    {
+        $course = new Course();
+        $course->setRawAttributes([
+            'id' => 150,
+            'name' => '公开课程',
+            'start_date' => '2026-08-01',
+            'end_date' => '2026-08-02',
+            'content' => '公开介绍',
+            'publicize_content' => '宣传介绍',
+            'status' => 1,
+            'course_status' => 20,
+            'sign_status' => 10,
+            'admin_id' => 9,
+            'department_id' => 10,
+            'teacher_id' => 11,
+            'show_mobile' => 1,
+        ]);
+
+        $teacher = new Teacher();
+        $teacher->setRawAttributes([
+            'id' => 11,
+            'name' => '张老师',
+            'mobile' => '13800138000',
+            'remark' => '内部备注',
+        ]);
+
+        $form = new CourseForm();
+        $form->setRawAttributes([
+            'id' => 1,
+            'name' => '姓名',
+            'field' => 'name',
+            'edit_input' => 'input',
+            'rule' => 'required',
+            'sort' => 1,
+            'help' => '请填写姓名',
+            'select_item' => null,
+            'need_fill' => 1,
+            'belong_user' => 1,
+            'admin_id' => 9,
+            'department_id' => 10,
+        ]);
+
+        $type = new CourseType();
+        $type->setRawAttributes(['id' => 3, 'name' => '管理类', 'wait_tip' => '内部提示']);
+
+        $course->setRelation('teacher', $teacher);
+        $course->setRelation('courseForms', new Collection([$form]));
+        $course->setRelation('typeDetail', $type);
+
+        $payload = (new PublicCourseResource($course))->resolve();
+
+        $this->assertSame(150, $payload['id']);
+        $this->assertSame('公开课程', $payload['name']);
+        $this->assertSame('张老师', $payload['teacher']['name']);
+        $this->assertArrayNotHasKey('mobile', $payload['teacher']);
+        $this->assertArrayNotHasKey('remark', $payload['teacher']);
+        $this->assertArrayNotHasKey('admin_id', $payload);
+        $this->assertArrayNotHasKey('department_id', $payload);
+        $this->assertArrayNotHasKey('teacher_id', $payload);
+        $this->assertArrayNotHasKey('wait_tip', $payload['type_detail']);
+        $this->assertArrayNotHasKey('admin_id', $payload['course_forms'][0]);
+        $this->assertArrayNotHasKey('department_id', $payload['course_forms'][0]);
+        $this->assertArrayNotHasKey('deleted_at', $payload['course_forms'][0]);
+    }
+
+    public function test_public_resource_does_not_include_model_appends(): void
+    {
+        $course = new Course();
+        $course->setRawAttributes([
+            'id' => 1,
+            'name' => '公开课程',
+            'status' => 1,
+            'course_status' => 20,
+            'sign_status' => 10,
+        ]);
+
+        $payload = (new PublicCourseResource($course))->resolve();
+
+        $this->assertArrayNotHasKey('teacher_detail', $payload);
+        $this->assertArrayNotHasKey('show_mobile_text', $payload);
+        $this->assertSame([], $payload['publicize']);
+        $this->assertArrayNotHasKey('qrcode', $payload);
+    }
+}