diff --git a/src/modules/mobile-game/MobileGame.vue b/src/modules/mobile-game/MobileGame.vue
index 276920b..5deb4a0 100644
--- a/src/modules/mobile-game/MobileGame.vue
+++ b/src/modules/mobile-game/MobileGame.vue
@@ -1,7 +1,9 @@
 <script setup>
+import { ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 import HeroSection from './components/HeroSection.vue'
 import ScreenshotCarousel from './components/ScreenshotCarousel.vue'
+import SubTabs from './components/SubTabs.vue'
 import VersionTimeline from './components/VersionTimeline.vue'
 import TeamCard from './components/TeamCard.vue'
 import Leaderboard from './components/Leaderboard.vue'
@@ -11,6 +13,14 @@ const L = (zh, en) => (locale.value === 'zh-CN' ? zh : en)
 // 站点根绝对路径，用绑定避免被 Vite 当作构建期静态资源解析
 const videoPoster = '/448/2.jpg'
 const videoSrc = '/448/ml/449ml.mp4'
+
+// 子标签页：默认显示团队+排行榜
+const subTabs = [
+  { id: 'team', label: { zh: '团队 · 排行榜', en: 'Team · Leaderboard' } },
+  { id: 'iterations', label: { zh: '迭代记录', en: 'Iterations' } },
+  { id: 'experiment', label: { zh: '实验', en: 'Experiment' } }
+]
+const activeTab = ref('team')
 </script>
 
 <template>
@@ -18,7 +28,7 @@ const videoSrc = '/448/ml/449ml.mp4'
     <HeroSection />
 
     <div class="container">
-      <!-- 概览 + 截图轮播 -->
+      <!-- 概览 + 截图轮播（始终显示） -->
       <section class="block">
         <div class="block__grid">
           <div class="block__text">
@@ -45,46 +55,51 @@ const videoSrc = '/448/ml/449ml.mp4'
         </div>
       </section>
 
-      <!-- 版本时间线 -->
+      <!-- 子标签页区域 -->
       <section class="block">
-        <h2 class="section-title">
-          <small>{{ L('版本演进', 'Version History') }}</small>
-          {{ L('迭代记录', 'Iteration Record') }}
-        </h2>
-        <VersionTimeline />
-      </section>
+        <SubTabs v-model="activeTab" :tabs="subTabs" />
 
-      <!-- 双列：团队 + 排行榜 -->
-      <section class="block block--two">
-        <div>
-          <h2 class="section-title">
-            <small>{{ L('团队', 'Team') }}</small>
-            {{ L('成员', 'Members') }}
-          </h2>
-          <TeamCard />
+        <!-- 团队 + 排行榜（默认） -->
+        <div v-show="activeTab === 'team'" class="block--two">
+          <div>
+            <h2 class="section-title">
+              <small>{{ L('团队', 'Team') }}</small>
+              {{ L('成员', 'Members') }}
+            </h2>
+            <TeamCard />
+          </div>
+          <div>
+            <h2 class="section-title">
+              <small>{{ L('排行榜', 'Leaderboard') }}</small>
+              {{ L('玩家分数 Top 30', 'Top 30 Scores') }}
+            </h2>
+            <Leaderboard />
+          </div>
         </div>
-        <div>
-          <h2 class="section-title">
-            <small>{{ L('排行榜', 'Leaderboard') }}</small>
-            {{ L('玩家分数 Top 30', 'Top 30 Scores') }}
-          </h2>
-          <Leaderboard />
-        </div>
-      </section>
 
-      <!-- ML-Agents 演示视频 -->
-      <section class="block">
-        <h2 class="section-title">
-          <small>{{ L('实验', 'Experiment') }}</small>
-          {{ L('ML-Agents 强化学习演示', 'ML-Agents Reinforcement Learning Demo') }}
-        </h2>
-        <div class="video-wrap">
-          <video controls preload="none" :poster="videoPoster">
-            <source :src="videoSrc" type="video/mp4" />
-          </video>
-          <p class="video-caption">
-            {{ L('胶囊体经 ML-Agents 训练，学习保球不掉与越障。', 'Capsules trained via ML-Agents to keep the ball from falling and to navigate obstacles.') }}
-          </p>
+        <!-- 迭代记录 -->
+        <div v-show="activeTab === 'iterations'">
+          <h2 class="section-title">
+            <small>{{ L('版本演进', 'Version History') }}</small>
+            {{ L('迭代记录', 'Iteration Record') }}
+          </h2>
+          <VersionTimeline />
+        </div>
+
+        <!-- 实验 -->
+        <div v-show="activeTab === 'experiment'">
+          <h2 class="section-title">
+            <small>{{ L('实验', 'Experiment') }}</small>
+            {{ L('ML-Agents 强化学习演示', 'ML-Agents Reinforcement Learning Demo') }}
+          </h2>
+          <div class="video-wrap">
+            <video controls preload="none" :poster="videoPoster">
+              <source :src="videoSrc" type="video/mp4" />
+            </video>
+            <p class="video-caption">
+              {{ L('胶囊体经 ML-Agents 训练，学习保球不掉与越障。', 'Capsules trained via ML-Agents to keep the ball from falling and to navigate obstacles.') }}
+            </p>
+          </div>
         </div>
       </section>
     </div>
diff --git a/src/modules/mobile-game/components/HeroSection.vue b/src/modules/mobile-game/components/HeroSection.vue
index 53516f1..ff80433 100644
--- a/src/modules/mobile-game/components/HeroSection.vue
+++ b/src/modules/mobile-game/components/HeroSection.vue
@@ -7,7 +7,7 @@ const { locale } = useI18n({ useScope: 'global' })
 const meta = {
   course: { zh: '迈阿密大学 · 毕设 448 / 449', en: 'Miami University · Capstone 448 / 449' },
   stack: { zh: 'Unity · C# · WebGL · Android · PHP', en: 'Unity · C# · WebGL · Android · PHP' },
-  period: { zh: '2022', en: '2022' },
+  period: '2022',
   role: { zh: '主开发', en: 'Lead Developer' }
 }
 </script>
diff --git a/src/modules/mobile-game/components/SubTabs.vue b/src/modules/mobile-game/components/SubTabs.vue
new file mode 100644
index 0000000..edd64ad
--- /dev/null
+++ b/src/modules/mobile-game/components/SubTabs.vue
@@ -0,0 +1,66 @@
+<script setup>
+import { useI18n } from 'vue-i18n'
+
+const props = defineProps({
+  tabs: { type: Array, required: true }, // [{ id, label: {zh,en} }]
+  modelValue: { type: String, required: true }
+})
+const emit = defineEmits(['update:modelValue'])
+
+const { locale } = useI18n({ useScope: 'global' })
+const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
+</script>
+
+<template>
+  <div class="subtabs">
+    <button
+      v-for="t in tabs"
+      :key="t.id"
+      type="button"
+      class="subtabs__btn"
+      :class="{ 'is-active': modelValue === t.id }"
+      @click="emit('update:modelValue', t.id)"
+    >
+      {{ L(t.label) }}
+    </button>
+  </div>
+</template>
+
+<style scoped>
+.subtabs {
+  display: flex;
+  gap: var(--space-xs);
+  border-bottom: 1px solid var(--border);
+  margin-bottom: var(--space-lg);
+  overflow-x: auto;
+  scrollbar-width: none;
+}
+.subtabs::-webkit-scrollbar {
+  display: none;
+}
+.subtabs__btn {
+  position: relative;
+  padding: var(--space-sm) var(--space-md);
+  font-size: 0.92rem;
+  font-weight: 500;
+  color: var(--text-secondary);
+  white-space: nowrap;
+  transition: color var(--transition);
+}
+.subtabs__btn:hover {
+  color: var(--text-primary);
+}
+.subtabs__btn.is-active {
+  color: var(--accent);
+}
+.subtabs__btn.is-active::after {
+  content: '';
+  position: absolute;
+  left: var(--space-md);
+  right: var(--space-md);
+  bottom: -1px;
+  height: 2px;
+  background: var(--accent);
+  border-radius: 2px;
+}
+</style>
diff --git a/src/modules/mobile-game/components/VersionTimeline.vue b/src/modules/mobile-game/components/VersionTimeline.vue
index 2aa6a35..88a3103 100644
--- a/src/modules/mobile-game/components/VersionTimeline.vue
+++ b/src/modules/mobile-game/components/VersionTimeline.vue
@@ -6,7 +6,7 @@ import { versions, tracks } from '../data/versions.js'
 const { locale } = useI18n({ useScope: 'global' })
 const L = (obj) => (locale.value === 'zh-CN' ? obj.zh : obj.en)
 
-// 按演进线分组；同一线内按 order 排序；线之间按各自最早 order 排序
+// 按 tracks 数组顺序分组（3D 最终形态在前）；同一线内按 order 排序
 const grouped = computed(() => {
   return tracks
     .map((t) => {
@@ -16,11 +16,13 @@ const grouped = computed(() => {
       return { track: t, items }
     })
     .filter((g) => g.items.length > 0)
-    .sort((a, b) => Math.min(...a.items.map((i) => i.order)) - Math.min(...b.items.map((i) => i.order)))
 })
 
-// 标记 3D 转折：3D 线之前的最后一条 2D 线结尾，提示形态转变
 const is3D = (track) => track.form === '3D'
+const isFeatured = (track) => track.featured
+
+// 形态转变标记：出现在 3D 线（首位）之后、2D 线之前
+const showPivotAfter = (gi) => gi === 0 && grouped.value.length > 1 && is3D(grouped.value[0].track)
 </script>
 
 <template>
@@ -29,12 +31,16 @@ const is3D = (track) => track.form === '3D'
       v-for="(g, gi) in grouped"
       :key="g.track.id"
       class="timeline__track"
-      :class="{ 'timeline__track--3d': is3D(g.track) }"
+      :class="{
+        'timeline__track--3d': is3D(g.track),
+        'timeline__track--featured': isFeatured(g.track)
+      }"
     >
       <!-- 线标题 -->
       <div class="timeline__track-head">
         <span class="timeline__form" :class="{ 'is-3d': is3D(g.track) }">{{ g.track.form }}</span>
         <span class="timeline__track-name">{{ L(g.track.name) }}</span>
+        <span v-if="isFeatured(g.track)" class="timeline__star">★</span>
       </div>
       <p class="timeline__track-desc">{{ L(g.track.desc) }}</p>
 
@@ -78,11 +84,11 @@ const is3D = (track) => track.form === '3D'
         </div>
       </div>
 
-      <!-- 2D -> 3D 转折标记：仅出现在第一条 3D 线之前 -->
-      <div v-if="is3D(g.track) && gi > 0" class="timeline__pivot">
+      <!-- 形态转变标记：3D 线之后、2D 线之前 -->
+      <div v-if="showPivotAfter(gi)" class="timeline__pivot">
         <span class="timeline__pivot-line"></span>
         <span class="timeline__pivot-text">
-          {{ locale === 'zh-CN' ? '形态转变：2D → 3D 滚球' : 'Form shift: 2D → 3D rolling ball' }}
+          {{ locale === 'zh-CN' ? '早期并行演进：2D 线' : 'Earlier parallel lines: 2D' }}
         </span>
         <span class="timeline__pivot-line"></span>
       </div>
@@ -96,8 +102,19 @@ const is3D = (track) => track.form === '3D'
   flex-direction: column;
   gap: var(--space-xl);
 }
-.timeline__track--3d {
-  padding-top: var(--space-sm);
+
+/* 最终形态强调 */
+.timeline__track--featured {
+  padding: var(--space-lg);
+  background: linear-gradient(180deg, var(--accent-weak) 0%, transparent 100%);
+  border: 1px solid var(--accent-weak);
+  border-radius: var(--radius);
+}
+.timeline__track--featured .timeline__track-name {
+  font-size: 1.2rem;
+}
+.timeline__track--featured .timeline__track-desc {
+  color: var(--text-primary);
 }
 
 .timeline__track-head {
@@ -118,14 +135,18 @@ const is3D = (track) => track.form === '3D'
   letter-spacing: 0.04em;
 }
 .timeline__form.is-3d {
-  background: var(--accent-weak);
-  color: var(--accent);
+  background: var(--accent);
+  color: #fff;
 }
 .timeline__track-name {
   font-weight: 600;
   font-size: 1.05rem;
   color: var(--text-primary);
 }
+.timeline__star {
+  color: var(--accent);
+  font-size: 0.9rem;
+}
 .timeline__track-desc {
   font-size: 0.9rem;
   color: var(--text-secondary);
@@ -220,7 +241,7 @@ const is3D = (track) => track.form === '3D'
   font-size: 0.85rem;
 }
 
-/* 2D -> 3D 转折标记 */
+/* 形态转变标记 */
 .timeline__pivot {
   display: flex;
   align-items: center;
@@ -235,7 +256,7 @@ const is3D = (track) => track.form === '3D'
 .timeline__pivot-text {
   font-size: 0.8rem;
   font-weight: 600;
-  color: var(--accent);
+  color: var(--text-tertiary);
   white-space: nowrap;
   letter-spacing: 0.02em;
 }
diff --git a/src/modules/mobile-game/data/versions.js b/src/modules/mobile-game/data/versions.js
index 792686b..9b697c7 100644
--- a/src/modules/mobile-game/data/versions.js
+++ b/src/modules/mobile-game/data/versions.js
@@ -9,6 +9,16 @@
 // track 字段标识所属演进线；form 标识 2D/3D；order 用于时间线排序（按发布先后）。
 
 export const tracks = [
+  {
+    id: 'roll-a-ball',
+    name: { zh: '3D 滚球（最终形态）', en: '3D Rolling Ball (Final Form)' },
+    form: '3D',
+    featured: true,
+    desc: {
+      zh: '项目从 2D 转向 3D 的最终形态。手机陀螺仪倾斜操控滚球，含雪花砖掉落、黄色砖弹跳等机制。',
+      en: 'The final form as the project shifted from 2D to 3D. Tilt the phone to roll the ball; snowflake bricks fall, yellow bricks bounce.'
+    }
+  },
   {
     id: 'zikai-ui',
     name: { zh: 'zikai-ui 角色控制器', en: 'zikai-ui Character Controller' },
@@ -35,15 +45,6 @@ export const tracks = [
       zh: '2D 横版平台跳跃，吃金币、计分、血量、触屏摇杆。',
       en: '2D side-scrolling platformer: collect coins, score, health, touch joystick.'
     }
-  },
-  {
-    id: 'roll-a-ball',
-    name: { zh: '3D 滚球（最终形态）', en: '3D Rolling Ball (Final Form)' },
-    form: '3D',
-    desc: {
-      zh: '项目从 2D 转向 3D 的最终形态。手机陀螺仪倾斜操控滚球，含雪花砖掉落、黄色砖弹跳等机制。',
-      en: 'The final form as the project shifted from 2D to 3D. Tilt the phone to roll the ball; snowflake bricks fall, yellow bricks bounce.'
-    }
   }
 ]