diff --git a/app/citizen-frontend/src/api/course.ts b/app/citizen-frontend/src/api/course.ts
index 9d3d6f5..7146277 100644
--- a/app/citizen-frontend/src/api/course.ts
+++ b/app/citizen-frontend/src/api/course.ts
@@ -41,8 +41,8 @@ function toCourseRow(raw: CourseListApiRow): CourseRow {
 }
 
 /** 依登入 Cookie 取得目前使用者的體適能組別。 */
-export function fetchGroup(): Promise<FitnessGroup> {
-  return api.get("course/group").json<FitnessGroup>();
+export function fetchGroup(): Promise<FitnessGroup | ""> {
+  return api.get("course/group").json<FitnessGroup | "">();
 }
 
 /** 取得是否納入早上時段 */
diff --git a/app/citizen-frontend/src/components/layout/DefaultLayout.vue b/app/citizen-frontend/src/components/layout/DefaultLayout.vue
index 4493df3..1598c91 100644
--- a/app/citizen-frontend/src/components/layout/DefaultLayout.vue
+++ b/app/citizen-frontend/src/components/layout/DefaultLayout.vue
@@ -279,8 +279,10 @@
 import { ref, watch } from "vue";
 import { useRoute, useRouter } from "vue-router";
 import { useAppStore } from "@/stores/app";
+import { useCourseStore } from "@/stores/course";
 
 const store = useAppStore();
+const courseStore = useCourseStore();
 const router = useRouter();
 const route = useRoute();
 
@@ -314,6 +316,7 @@ function getBottomNavIconColor(value: string) {
 
 async function handleLogout() {
   await store.logout();
+  courseStore.resetGroup();
   await router.push("/login");
   drawer.value = false;
 }
diff --git a/app/citizen-frontend/src/pages/appointment.vue b/app/citizen-frontend/src/pages/appointment.vue
index d09b3d6..4cb549f 100644
--- a/app/citizen-frontend/src/pages/appointment.vue
+++ b/app/citizen-frontend/src/pages/appointment.vue
@@ -9,6 +9,18 @@
         </v-card-subtitle>
       </v-card>
 
+      <v-alert
+        v-if="showMissingGroupNotice"
+        class="rounded-xl mb-6"
+        closable
+        icon="mdi-calendar-alert"
+        type="info"
+        variant="tonal"
+        @click:close="dismissMissingGroupNotice"
+      >
+        尚未取得您的體適能分組，請先預約並完成現場普測；分組建立後即可查看個人化課程建議。
+      </v-alert>
+
       <!-- 活動分類選擇 -->
       <v-tabs
         v-model="filterTab"
@@ -249,12 +261,18 @@
 
 <script setup lang="ts">
 import { computed, ref } from "vue";
+import { useRoute, useRouter } from "vue-router";
 import Layout from "@/components/layout/DefaultLayout.vue";
 import QRCode from "@/components/QRCode.vue";
 import { type Appointment, useAppStore } from "@/stores/app";
 
 const store = useAppStore();
+const route = useRoute();
+const router = useRouter();
 const filterTab = ref("all");
+const showMissingGroupNotice = ref(
+  route.query.reason === "missing-fitness-group",
+);
 
 const qrcodeDialog = ref(false);
 const selectedApt = ref<Appointment | null>(null);
@@ -301,6 +319,14 @@ function handleCancel(id: string) {
   store.cancelAppointment(id);
 }
 
+async function dismissMissingGroupNotice() {
+  showMissingGroupNotice.value = false;
+
+  const query = { ...route.query };
+  delete query.reason;
+  await router.replace({ query });
+}
+
 function showCheckinQRCode(apt: Appointment) {
   selectedApt.value = apt;
   qrcodeDialog.value = true;
diff --git a/app/citizen-frontend/src/pages/course.vue b/app/citizen-frontend/src/pages/course.vue
index c06242f..c2b5c19 100644
--- a/app/citizen-frontend/src/pages/course.vue
+++ b/app/citizen-frontend/src/pages/course.vue
@@ -1,364 +1,402 @@
 <template>
   <Layout>
     <template #main>
-      <!-- 頁面標題：刻意縮小，把版面讓給下方的組別 -->
-      <div class="d-flex align-center mb-3">
-        <v-icon
-          class="mr-2"
-          color="primary"
-          icon="mdi-calendar-week"
-          size="18"
-        />
-
-        <span class="text-title-small font-weight-bold text-grey-darken-1"
-          >課程建議</span
-        >
-      </div>
-
-      <!-- 體適能組別：本頁所有內容都依它而定，因此獨立成一張顯眼的卡片 -->
-      <v-card
-        class="rounded-xl mb-6 overflow-hidden"
-        elevation="1"
-        variant="flat"
-      >
-        <v-card-item class="pa-4" :class="`bg-${store.groupMeta.color}`">
-          <template #prepend>
-            <v-avatar class="group-avatar" size="60">
-              <v-icon color="white" :icon="store.groupMeta.icon" size="34" />
-            </v-avatar>
-          </template>
-
-          <template #subtitle>
-            <span class="text-title-small group-caption">你的體適能組別</span>
-          </template>
-
-          <template #title>
-            <span class="text-h5 font-weight-black text-white">{{
-              store.groupMeta.label
-            }}</span>
-          </template>
-        </v-card-item>
-
-        <v-card-text class="text-body-medium text-grey-darken-2 pa-4">
-          {{ store.groupMeta.description }}
-        </v-card-text>
-      </v-card>
-
-      <!-- 時段篩選尚未開放給使用者操作，先隱藏 -->
-      <v-card v-if="SHOW_SLOT_FILTER" class="rounded-xl mb-6" variant="flat">
-        <v-card-text>
-          <div class="text-title-small text-grey mb-2">選擇要顯示的時段</div>
-
-          <v-btn-toggle
-            v-model="selectedSlots"
-            border
-            class="d-flex"
+      <template v-if="store.groupLoaded">
+        <!-- 頁面標題：刻意縮小，把版面讓給下方的組別 -->
+        <div class="d-flex align-center mb-3">
+          <v-icon
+            class="mr-2"
             color="primary"
-            divided
-            multiple
-            variant="flat"
-          >
-            <v-btn
-              v-for="slot in SLOTS"
-              :key="slot.key"
-              class="flex-grow-1"
-              :prepend-icon="slot.icon"
-              size="small"
-              :value="slot.key"
-            >
-              {{ slot.label }}
-            </v-btn>
-          </v-btn-toggle>
-        </v-card-text>
-      </v-card>
+            icon="mdi-calendar-week"
+            size="18"
+          />
 
-      <!-- 載入中 -->
-      <template v-if="store.loading">
-        <v-skeleton-loader
-          v-for="n in 3"
-          :key="n"
-          class="rounded-xl mb-4"
-          type="article"
-        />
+          <span class="text-title-small font-weight-bold text-grey-darken-1"
+            >課程建議</span
+          >
+        </div>
+
+        <!-- 體適能組別：本頁所有內容都依它而定，因此獨立成一張顯眼的卡片 -->
+        <v-card
+          class="rounded-xl mb-6 overflow-hidden"
+          elevation="1"
+          variant="flat"
+        >
+          <v-card-item class="pa-4" :class="`bg-${store.groupMeta.color}`">
+            <template #prepend>
+              <v-avatar class="group-avatar" size="60">
+                <v-icon color="white" :icon="store.groupMeta.icon" size="34" />
+              </v-avatar>
+            </template>
+
+            <template #subtitle>
+              <span class="text-title-small group-caption">你的體適能組別</span>
+            </template>
+
+            <template #title>
+              <span class="text-h5 font-weight-black text-white">{{
+                store.groupMeta.label
+              }}</span>
+            </template>
+          </v-card-item>
+
+          <v-card-text class="text-body-medium text-grey-darken-2 pa-4">
+            {{ store.groupMeta.description }}
+          </v-card-text>
+        </v-card>
+
+        <!-- 時段篩選尚未開放給使用者操作，先隱藏 -->
+        <v-card v-if="SHOW_SLOT_FILTER" class="rounded-xl mb-6" variant="flat">
+          <v-card-text>
+            <div class="text-title-small text-grey mb-2">選擇要顯示的時段</div>
+
+            <v-btn-toggle
+              v-model="selectedSlots"
+              border
+              class="d-flex"
+              color="primary"
+              divided
+              multiple
+              variant="flat"
+            >
+              <v-btn
+                v-for="slot in SLOTS"
+                :key="slot.key"
+                class="flex-grow-1"
+                :prepend-icon="slot.icon"
+                size="small"
+                :value="slot.key"
+              >
+                {{ slot.label }}
+              </v-btn>
+            </v-btn-toggle>
+          </v-card-text>
+        </v-card>
+
+        <!-- 載入中 -->
+        <template v-if="store.loading">
+          <v-skeleton-loader
+            v-for="n in 3"
+            :key="n"
+            class="rounded-xl mb-4"
+            type="article"
+          />
+        </template>
+
+        <!-- 載入失敗 -->
+        <v-alert
+          v-else-if="store.error"
+          class="rounded-xl"
+          icon="mdi-alert-circle-outline"
+          type="error"
+          variant="tonal"
+        >
+          {{ store.error }}
+
+          <template #append>
+            <v-btn size="small" variant="text" @click="store.loadAll()"
+              >重試</v-btn
+            >
+          </template>
+        </v-alert>
+
+        <!-- 沒有選取任何時段 -->
+        <v-alert
+          v-else-if="!store.hasCourse"
+          class="rounded-xl"
+          icon="mdi-calendar-remove-outline"
+          type="info"
+          variant="tonal"
+        >
+          目前沒有可顯示的課程，請至少選擇一個時段。
+        </v-alert>
+
+        <!-- 一週課表：仿 doc/課程表示意 的表格版型，星期為列、時段為欄 -->
+        <template v-else>
+          <!-- 課程說明：對應 doc/課程說明.md -->
+          <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
+            <v-card-title
+              class="text-title-medium font-weight-bold text-primary d-flex align-center"
+            >
+              <v-icon
+                class="mr-2"
+                color="primary"
+                icon="mdi-book-open-variant"
+                size="20"
+              />
+              課程說明
+            </v-card-title>
+
+            <v-divider />
+
+            <v-expansion-panels
+              v-model="openPanels"
+              multiple
+              variant="accordion"
+            >
+              <v-expansion-panel>
+                <v-expansion-panel-title class="font-weight-bold"
+                  >族群特徵</v-expansion-panel-title
+                >
+
+                <v-expansion-panel-text>
+                  <p class="text-body-medium text-grey-darken-2 mb-3">
+                    {{ detail.profile.summary }}
+                  </p>
+
+                  <div
+                    v-for="(item, index) in detail.profile.items"
+                    :key="index"
+                    class="d-flex align-start ga-3 mb-2"
+                  >
+                    <v-icon
+                      color="secondary"
+                      :icon="`mdi-numeric-${index + 1}-circle`"
+                      size="20"
+                    />
+                    <div class="text-body-medium">{{ item }}</div>
+                  </div>
+                </v-expansion-panel-text>
+              </v-expansion-panel>
+
+              <v-expansion-panel>
+                <v-expansion-panel-title class="font-weight-bold">
+                  精準運動處方建議
+                </v-expansion-panel-title>
+
+                <v-expansion-panel-text>
+                  <div
+                    v-for="(item, index) in detail.prescription"
+                    :key="index"
+                    class="d-flex align-start ga-3 mb-4"
+                  >
+                    <v-icon
+                      color="secondary"
+                      :icon="`mdi-numeric-${index + 1}-circle`"
+                      size="20"
+                    />
+
+                    <div>
+                      <div class="font-weight-bold">{{ item.title }}</div>
+
+                      <div class="text-body-medium text-grey-darken-2 mt-1">
+                        {{ item.detail }}
+                      </div>
+                    </div>
+                  </div>
+                </v-expansion-panel-text>
+              </v-expansion-panel>
+
+              <v-expansion-panel>
+                <v-expansion-panel-title class="font-weight-bold">
+                  {{ detail.outcome.label }}
+                </v-expansion-panel-title>
+
+                <v-expansion-panel-text>
+                  <div
+                    v-for="(item, index) in detail.outcome.items"
+                    :key="index"
+                    class="d-flex align-start ga-3 mb-2"
+                  >
+                    <v-icon
+                      color="secondary"
+                      :icon="`mdi-numeric-${index + 1}-circle`"
+                      size="20"
+                    />
+                    <div class="text-body-medium">{{ item }}</div>
+                  </div>
+                </v-expansion-panel-text>
+              </v-expansion-panel>
+            </v-expansion-panels>
+          </v-card>
+
+          <!-- 運動時間建議：對應 doc/運動時間建議.png -->
+          <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
+            <v-expansion-panels
+              v-model="durationTablePanel"
+              flat
+              variant="accordion"
+            >
+              <v-expansion-panel value="duration">
+                <v-expansion-panel-title
+                  class="course-table-panel-title text-title-medium font-weight-bold text-primary"
+                >
+                  <v-icon
+                    class="mr-2"
+                    color="primary"
+                    icon="mdi-timer-outline"
+                    size="20"
+                  />
+                  運動時間建議
+                </v-expansion-panel-title>
+
+                <v-divider />
+
+                <v-expansion-panel-text class="pa-0">
+                  <v-table class="course-table" density="comfortable">
+                    <thead>
+                      <tr>
+                        <th class="day-col bg-primary text-white text-center">
+                          星期
+                        </th>
+                        <th class="bg-primary text-white text-center">
+                          運動內容
+                        </th>
+                        <th class="time-col bg-primary text-white text-center">
+                          時間
+                        </th>
+                      </tr>
+                    </thead>
+
+                    <tbody>
+                      <tr
+                        v-for="row in detail.duration"
+                        :key="row.day"
+                        :class="{ 'bg-teal-lighten-5': row.day === todayDay }"
+                      >
+                        <td
+                          class="day-col text-center font-weight-bold text-primary"
+                        >
+                          {{ DAY_NAMES[row.day - 1] }}
+                        </td>
+
+                        <td class="text-body-medium text-wrap">
+                          {{ row.content }}
+                        </td>
+
+                        <td class="time-col text-center text-body-medium">
+                          {{ row.minutes === null ? "—" : `${row.minutes} 分` }}
+                        </td>
+                      </tr>
+                    </tbody>
+                  </v-table>
+                </v-expansion-panel-text>
+              </v-expansion-panel>
+            </v-expansion-panels>
+          </v-card>
+
+          <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
+            <v-expansion-panels
+              v-model="scheduleTablePanel"
+              flat
+              variant="accordion"
+            >
+              <v-expansion-panel value="schedule">
+                <v-expansion-panel-title
+                  class="course-table-panel-title text-title-medium font-weight-bold text-primary"
+                >
+                  <v-icon
+                    class="mr-2"
+                    color="primary"
+                    icon="mdi-timer-outline"
+                    size="20"
+                  />
+                  運動課表
+                </v-expansion-panel-title>
+
+                <v-divider />
+
+                <v-expansion-panel-text class="pa-0">
+                  <v-table class="course-table" density="comfortable">
+                    <thead>
+                      <tr>
+                        <th class="day-col bg-primary text-white text-center">
+                          星期
+                        </th>
+
+                        <th
+                          v-for="slot in visibleSlots"
+                          :key="slot.key"
+                          class="text-white text-center"
+                          :class="slot.headerClass"
+                        >
+                          <v-icon class="mr-1" :icon="slot.icon" size="16" />
+                          {{ slot.label }}
+                        </th>
+                      </tr>
+                    </thead>
+
+                    <tbody>
+                      <tr
+                        v-for="row in store.courseList"
+                        :key="row.day"
+                        :class="{ 'bg-teal-lighten-5': row.day === todayDay }"
+                      >
+                        <td
+                          class="day-col text-center font-weight-bold text-primary"
+                        >
+                          {{ DAY_NAMES[row.day - 1] }}
+                        </td>
+
+                        <td
+                          v-for="slot in visibleSlots"
+                          :key="slot.key"
+                          class="slot-cell text-body-medium text-wrap"
+                        >
+                          <div
+                            class="d-flex flex-column flex-md-row align-center ga-1 ga-md-3"
+                          >
+                            <v-avatar
+                              class="slot-avatar flex-shrink-0"
+                              rounded="lg"
+                            >
+                              <v-img
+                                :alt="`${DAY_NAMES[row.day - 1]}${slot.label}課表插圖`"
+                                :src="scheduleCardImage(row.day, slot.key)"
+                              />
+                            </v-avatar>
+
+                            <span>{{ row[slot.key] }}</span>
+                          </div>
+                        </td>
+                      </tr>
+                    </tbody>
+                  </v-table>
+                </v-expansion-panel-text>
+              </v-expansion-panel>
+            </v-expansion-panels>
+          </v-card>
+
+          <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
+            <v-img
+              :alt="`${store.groupMeta.label}課表示意圖`"
+              :src="groupIllustration"
+            />
+          </v-card>
+        </template>
       </template>
 
-      <!-- 載入失敗 -->
       <v-alert
-        v-else-if="store.error"
+        v-else-if="store.groupMissing"
+        class="rounded-xl"
+        icon="mdi-calendar-alert"
+        type="info"
+        variant="tonal"
+      >
+        尚未取得體適能分組，請先預約並完成現場普測。
+
+        <template #append>
+          <v-btn to="/appointment" variant="text">前往預約</v-btn>
+        </template>
+      </v-alert>
+
+      <v-alert
+        v-else-if="store.groupError"
         class="rounded-xl"
         icon="mdi-alert-circle-outline"
         type="error"
         variant="tonal"
       >
-        {{ store.error }}
+        {{ store.groupError }}
 
         <template #append>
-          <v-btn size="small" variant="text" @click="store.loadAll()"
+          <v-btn size="small" variant="text" @click="store.loadGroup(true)"
             >重試</v-btn
           >
         </template>
       </v-alert>
 
-      <!-- 沒有選取任何時段 -->
-      <v-alert
-        v-else-if="!store.hasCourse"
-        class="rounded-xl"
-        icon="mdi-calendar-remove-outline"
-        type="info"
-        variant="tonal"
-      >
-        目前沒有可顯示的課程，請至少選擇一個時段。
-      </v-alert>
-
-      <!-- 一週課表：仿 doc/課程表示意 的表格版型，星期為列、時段為欄 -->
-      <template v-else>
-        <!-- 課程說明：對應 doc/課程說明.md -->
-        <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
-          <v-card-title
-            class="text-title-medium font-weight-bold text-primary d-flex align-center"
-          >
-            <v-icon
-              class="mr-2"
-              color="primary"
-              icon="mdi-book-open-variant"
-              size="20"
-            />
-            課程說明
-          </v-card-title>
-
-          <v-divider />
-
-          <v-expansion-panels v-model="openPanels" multiple variant="accordion">
-            <v-expansion-panel>
-              <v-expansion-panel-title class="font-weight-bold"
-                >族群特徵</v-expansion-panel-title
-              >
-
-              <v-expansion-panel-text>
-                <p class="text-body-medium text-grey-darken-2 mb-3">
-                  {{ detail.profile.summary }}
-                </p>
-
-                <div
-                  v-for="(item, index) in detail.profile.items"
-                  :key="index"
-                  class="d-flex align-start ga-3 mb-2"
-                >
-                  <v-icon
-                    color="secondary"
-                    :icon="`mdi-numeric-${index + 1}-circle`"
-                    size="20"
-                  />
-                  <div class="text-body-medium">{{ item }}</div>
-                </div>
-              </v-expansion-panel-text>
-            </v-expansion-panel>
-
-            <v-expansion-panel>
-              <v-expansion-panel-title class="font-weight-bold">
-                精準運動處方建議
-              </v-expansion-panel-title>
-
-              <v-expansion-panel-text>
-                <div
-                  v-for="(item, index) in detail.prescription"
-                  :key="index"
-                  class="d-flex align-start ga-3 mb-4"
-                >
-                  <v-icon
-                    color="secondary"
-                    :icon="`mdi-numeric-${index + 1}-circle`"
-                    size="20"
-                  />
-
-                  <div>
-                    <div class="font-weight-bold">{{ item.title }}</div>
-
-                    <div class="text-body-medium text-grey-darken-2 mt-1">
-                      {{ item.detail }}
-                    </div>
-                  </div>
-                </div>
-              </v-expansion-panel-text>
-            </v-expansion-panel>
-
-            <v-expansion-panel>
-              <v-expansion-panel-title class="font-weight-bold">
-                {{ detail.outcome.label }}
-              </v-expansion-panel-title>
-
-              <v-expansion-panel-text>
-                <div
-                  v-for="(item, index) in detail.outcome.items"
-                  :key="index"
-                  class="d-flex align-start ga-3 mb-2"
-                >
-                  <v-icon
-                    color="secondary"
-                    :icon="`mdi-numeric-${index + 1}-circle`"
-                    size="20"
-                  />
-                  <div class="text-body-medium">{{ item }}</div>
-                </div>
-              </v-expansion-panel-text>
-            </v-expansion-panel>
-          </v-expansion-panels>
-        </v-card>
-
-        <!-- 運動時間建議：對應 doc/運動時間建議.png -->
-        <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
-          <v-expansion-panels
-            v-model="durationTablePanel"
-            flat
-            variant="accordion"
-          >
-            <v-expansion-panel value="duration">
-              <v-expansion-panel-title
-                class="course-table-panel-title text-title-medium font-weight-bold text-primary"
-              >
-                <v-icon
-                  class="mr-2"
-                  color="primary"
-                  icon="mdi-timer-outline"
-                  size="20"
-                />
-                運動時間建議
-              </v-expansion-panel-title>
-
-              <v-divider />
-
-              <v-expansion-panel-text class="pa-0">
-                <v-table class="course-table" density="comfortable">
-                  <thead>
-                    <tr>
-                      <th class="day-col bg-primary text-white text-center">
-                        星期
-                      </th>
-                      <th class="bg-primary text-white text-center">
-                        運動內容
-                      </th>
-                      <th class="time-col bg-primary text-white text-center">
-                        時間
-                      </th>
-                    </tr>
-                  </thead>
-
-                  <tbody>
-                    <tr
-                      v-for="row in detail.duration"
-                      :key="row.day"
-                      :class="{ 'bg-teal-lighten-5': row.day === todayDay }"
-                    >
-                      <td
-                        class="day-col text-center font-weight-bold text-primary"
-                      >
-                        {{ DAY_NAMES[row.day - 1] }}
-                      </td>
-
-                      <td class="text-body-medium text-wrap">
-                        {{ row.content }}
-                      </td>
-
-                      <td class="time-col text-center text-body-medium">
-                        {{ row.minutes === null ? "—" : `${row.minutes} 分` }}
-                      </td>
-                    </tr>
-                  </tbody>
-                </v-table>
-              </v-expansion-panel-text>
-            </v-expansion-panel>
-          </v-expansion-panels>
-        </v-card>
-
-        <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
-          <v-expansion-panels
-            v-model="scheduleTablePanel"
-            flat
-            variant="accordion"
-          >
-            <v-expansion-panel value="schedule">
-              <v-expansion-panel-title
-                class="course-table-panel-title text-title-medium font-weight-bold text-primary"
-              >
-                <v-icon
-                  class="mr-2"
-                  color="primary"
-                  icon="mdi-timer-outline"
-                  size="20"
-                />
-                運動課表
-              </v-expansion-panel-title>
-
-              <v-divider />
-
-              <v-expansion-panel-text class="pa-0">
-                <v-table class="course-table" density="comfortable">
-                  <thead>
-                    <tr>
-                      <th class="day-col bg-primary text-white text-center">
-                        星期
-                      </th>
-
-                      <th
-                        v-for="slot in visibleSlots"
-                        :key="slot.key"
-                        class="text-white text-center"
-                        :class="slot.headerClass"
-                      >
-                        <v-icon class="mr-1" :icon="slot.icon" size="16" />
-                        {{ slot.label }}
-                      </th>
-                    </tr>
-                  </thead>
-
-                  <tbody>
-                    <tr
-                      v-for="row in store.courseList"
-                      :key="row.day"
-                      :class="{ 'bg-teal-lighten-5': row.day === todayDay }"
-                    >
-                      <td
-                        class="day-col text-center font-weight-bold text-primary"
-                      >
-                        {{ DAY_NAMES[row.day - 1] }}
-                      </td>
-
-                      <td
-                        v-for="slot in visibleSlots"
-                        :key="slot.key"
-                        class="slot-cell text-body-medium text-wrap"
-                      >
-                        <div
-                          class="d-flex flex-column flex-md-row align-center ga-1 ga-md-3"
-                        >
-                          <v-avatar
-                            class="slot-avatar flex-shrink-0"
-                            rounded="lg"
-                          >
-                            <v-img
-                              :alt="`${DAY_NAMES[row.day - 1]}${slot.label}課表插圖`"
-                              :src="scheduleCardImage(row.day, slot.key)"
-                            />
-                          </v-avatar>
-
-                          <span>{{ row[slot.key] }}</span>
-                        </div>
-                      </td>
-                    </tr>
-                  </tbody>
-                </v-table>
-              </v-expansion-panel-text>
-            </v-expansion-panel>
-          </v-expansion-panels>
-        </v-card>
-
-        <v-card class="rounded-lg elevation-1 mt-4 overflow-hidden">
-          <v-img
-            :alt="`${store.groupMeta.label}課表示意圖`"
-            :src="groupIllustration"
-          />
-        </v-card>
-      </template>
+      <v-skeleton-loader v-else class="rounded-xl" type="article" />
     </template>
   </Layout>
 </template>
diff --git a/app/citizen-frontend/src/pages/index.vue b/app/citizen-frontend/src/pages/index.vue
index 926e65a..4206fd8 100644
--- a/app/citizen-frontend/src/pages/index.vue
+++ b/app/citizen-frontend/src/pages/index.vue
@@ -38,6 +38,9 @@
                 <span v-else-if="courseStore.groupLoaded" class="group-label">
                   {{ courseStore.groupMeta.label }}
                 </span>
+                <span v-else-if="courseStore.groupMissing" class="group-label">
+                  尚未分組
+                </span>
                 <span v-else class="group-label">無資料</span>
               </div>
             </v-col>
@@ -227,12 +230,55 @@
           to="/introduction"
         />
       </template>
+
+      <v-dialog v-model="missingGroupDialog" max-width="400">
+        <v-card class="rounded-xl overflow-hidden text-center">
+          <v-card-title class="bg-primary text-white font-weight-bold py-3">
+            尚未取得體適能分組
+          </v-card-title>
+
+          <v-card-text class="pa-6">
+            <v-avatar class="mb-4" color="primary" size="64">
+              <v-icon color="white" icon="mdi-calendar-check" size="34" />
+            </v-avatar>
+
+            <p class="text-body-1 font-weight-bold text-grey-darken-4 mb-2">
+              預約普測，建立您的體適能分組
+            </p>
+            <p class="text-body-2 text-grey-darken-2 mb-0">
+              完成預約並到現場參加量測後，系統才能建立您的體適能分組與課程建議。
+            </p>
+          </v-card-text>
+
+          <v-divider />
+
+          <v-card-actions class="pa-4 justify-end">
+            <v-btn
+              class="rounded-lg"
+              color="primary"
+              variant="text"
+              @click="missingGroupDialog = false"
+            >
+              稍後再說
+            </v-btn>
+            <v-btn
+              class="rounded-lg font-weight-bold"
+              color="primary"
+              variant="flat"
+              @click="goToAppointment"
+            >
+              前往預約
+            </v-btn>
+          </v-card-actions>
+        </v-card>
+      </v-dialog>
     </template>
   </Layout>
 </template>
 
 <script setup lang="ts">
-import { computed, watch } from "vue";
+import { computed, ref, watch } from "vue";
+import { useRouter } from "vue-router";
 import BrandAvatar from "@/components/BrandAvatar.vue";
 import HealthRadarChart from "@/components/HealthRadarChart.vue";
 import Layout from "@/components/layout/DefaultLayout.vue";
@@ -242,17 +288,65 @@ import { useCourseStore } from "@/stores/course";
 
 const store = useAppStore();
 const courseStore = useCourseStore();
+const router = useRouter();
+const missingGroupDialog = ref(false);
+
+const MISSING_GROUP_DIALOG_KEY = "missing-fitness-group-dialog-shown";
+
+function hasShownMissingGroupDialog() {
+  try {
+    return sessionStorage.getItem(MISSING_GROUP_DIALOG_KEY) === "true";
+  } catch {
+    return false;
+  }
+}
+
+function markMissingGroupDialogShown() {
+  try {
+    sessionStorage.setItem(MISSING_GROUP_DIALOG_KEY, "true");
+  } catch {
+    // 部分瀏覽器可能封鎖 sessionStorage，仍允許本次彈窗正常使用。
+  }
+}
+
+function clearMissingGroupDialogMarker() {
+  try {
+    sessionStorage.removeItem(MISSING_GROUP_DIALOG_KEY);
+  } catch {
+    // 不影響主要流程。
+  }
+}
+
+function openMissingGroupDialog() {
+  if (
+    store.isLoggedIn &&
+    courseStore.groupMissing &&
+    !hasShownMissingGroupDialog()
+  ) {
+    markMissingGroupDialogShown();
+    missingGroupDialog.value = true;
+  }
+}
+
+async function goToAppointment() {
+  missingGroupDialog.value = false;
+  await router.push({ name: "appointment" });
+}
 
 async function loadFitnessGroup() {
   if (!store.isLoggedIn) {
+    missingGroupDialog.value = false;
+    clearMissingGroupDialogMarker();
     courseStore.resetGroup();
     return;
   }
 
   try {
     await courseStore.loadGroup();
+    clearMissingGroupDialogMarker();
   } catch {
     // 錯誤狀態由 course store 提供給畫面顯示與重試。
+    openMissingGroupDialog();
   }
 }
 
diff --git a/app/citizen-frontend/src/router/index.ts b/app/citizen-frontend/src/router/index.ts
index 4a605f9..772c3e4 100644
--- a/app/citizen-frontend/src/router/index.ts
+++ b/app/citizen-frontend/src/router/index.ts
@@ -10,6 +10,8 @@ import Profile from "@/pages/profile.vue";
 import Register from "@/pages/register.vue";
 import SelfAssessment from "@/pages/self-assessment.vue";
 import { useAppStore } from "@/stores/app";
+import { useCourseStore } from "@/stores/course";
+import { getApiErrorStatus } from "@/utils/api-error";
 
 const router = createRouter({
   history: createWebHistory(import.meta.env.BASE_URL),
@@ -60,7 +62,11 @@ const router = createRouter({
       path: "/course",
       name: "course",
       component: Course,
-      meta: { requiresAuth: true, title: "課程建議｜運動玩轉健康力" },
+      meta: {
+        requiresAuth: true,
+        requiresFitnessGroup: true,
+        title: "課程建議｜運動玩轉健康力",
+      },
     },
     {
       path: "/checkin",
@@ -88,6 +94,31 @@ router.beforeEach(async (to) => {
       query: { redirect: to.fullPath },
     };
   }
+
+  if (to.meta.requiresFitnessGroup) {
+    const courseStore = useCourseStore();
+
+    try {
+      await courseStore.ensureGroup();
+    } catch (error) {
+      if (getApiErrorStatus(error) === 401 || !store.isLoggedIn) {
+        return {
+          name: "login",
+          query: { redirect: to.fullPath },
+        };
+      }
+
+      if (courseStore.groupMissing) {
+        return {
+          name: "appointment",
+          query: { reason: "missing-fitness-group" },
+        };
+      }
+
+      // 技術性錯誤不應被誤導成尚未分組，返回首頁讓使用者重試。
+      return { name: "home" };
+    }
+  }
 });
 
 router.afterEach((to) => {
@@ -99,9 +130,11 @@ router.afterEach((to) => {
 if (typeof window !== "undefined") {
   window.addEventListener("auth-expired", () => {
     const store = useAppStore();
+    const courseStore = useCourseStore();
     const currentRoute = router.currentRoute.value;
     const wasLoggedIn = store.isLoggedIn;
     store.clearAuthentication();
+    courseStore.resetGroup();
 
     if (wasLoggedIn && currentRoute.name !== "login") {
       void router.replace({
diff --git a/app/citizen-frontend/src/stores/course.ts b/app/citizen-frontend/src/stores/course.ts
index 6aa5faa..7fe1fec 100644
--- a/app/citizen-frontend/src/stores/course.ts
+++ b/app/citizen-frontend/src/stores/course.ts
@@ -217,7 +217,10 @@ export const useCourseStore = defineStore("course", () => {
   const group = ref<FitnessGroup>("medium");
   const groupLoaded = ref(false);
   const groupLoading = ref(false);
+  const groupMissing = ref(false);
   const groupError = ref("");
+  let groupRequest: Promise<FitnessGroup> | null = null;
+  let groupRequestVersion = 0;
   const morning = ref<YesNo>("Y");
   const noon = ref<YesNo>("Y");
   const night = ref<YesNo>("Y");
@@ -249,35 +252,86 @@ export const useCourseStore = defineStore("course", () => {
   );
 
   /** 只取得目前登入使用者的體適能組別，供首頁摘要使用。 */
-  async function loadGroup(): Promise<FitnessGroup> {
+  async function loadGroup(force = false): Promise<FitnessGroup> {
+    if (!force && groupLoaded.value) {
+      return group.value;
+    }
+
+    if (!force && groupMissing.value) {
+      throw new Error("尚未完成體適能分組。");
+    }
+
+    if (groupRequest) {
+      return groupRequest;
+    }
+
     groupLoading.value = true;
+    groupLoaded.value = false;
+    groupMissing.value = false;
     groupError.value = "";
+    const requestVersion = ++groupRequestVersion;
+
+    const request = (async () => {
+      try {
+        const groupValue = USE_MOCK ? "medium" : await fetchGroup();
+
+        if (requestVersion !== groupRequestVersion) {
+          throw new Error("體適能分組請求已取消。");
+        }
+
+        if (groupValue === "") {
+          groupMissing.value = true;
+          throw new Error("尚未完成體適能分組。");
+        }
+
+        if (!isFitnessGroup(groupValue)) {
+          throw new Error("體適能組別資料格式不正確。");
+        }
+
+        group.value = groupValue;
+        groupLoaded.value = true;
+        return groupValue;
+      } catch (error_) {
+        if (requestVersion !== groupRequestVersion) {
+          throw error_;
+        }
+
+        groupLoaded.value = false;
+        groupError.value = groupMissing.value
+          ? ""
+          : error_ instanceof Error
+            ? error_.message
+            : "體適能組別載入失敗，請稍後再試。";
+        throw error_;
+      } finally {
+        if (requestVersion === groupRequestVersion) {
+          groupLoading.value = false;
+        }
+      }
+    })();
+
+    groupRequest = request;
 
     try {
-      const groupValue = USE_MOCK ? "medium" : await fetchGroup();
-
-      if (!isFitnessGroup(groupValue)) {
-        throw new Error("體適能組別資料格式不正確。");
-      }
-
-      group.value = groupValue;
-      groupLoaded.value = true;
-      return groupValue;
-    } catch (error_) {
-      groupLoaded.value = false;
-      groupError.value =
-        error_ instanceof Error
-          ? error_.message
-          : "體適能組別載入失敗，請稍後再試。";
-      throw error_;
+      return await request;
     } finally {
-      groupLoading.value = false;
+      if (groupRequest === request) {
+        groupRequest = null;
+      }
     }
   }
 
+  async function ensureGroup(): Promise<FitnessGroup> {
+    return loadGroup();
+  }
+
   function resetGroup() {
+    groupRequestVersion += 1;
+    groupRequest = null;
+    groupLoading.value = false;
     group.value = "medium";
     groupLoaded.value = false;
+    groupMissing.value = false;
     groupError.value = "";
   }
 
@@ -379,12 +433,14 @@ export const useCourseStore = defineStore("course", () => {
     error,
     groupLoaded,
     groupLoading,
+    groupMissing,
     groupError,
     groupMeta,
     selectedSlots,
     hasCourse,
     loadAll,
     loadGroup,
+    ensureGroup,
     resetGroup,
     loadCourseList,
     loadPreferences,