diff --git a/apps/webgl/frontend/src/App.vue b/apps/webgl/frontend/src/App.vue
index 52e885a..b7a9b0d 100644
--- a/apps/webgl/frontend/src/App.vue
+++ b/apps/webgl/frontend/src/App.vue
@@ -30,6 +30,23 @@ const input = ref('')
 const busy = ref(false)
 const error = ref<string | null>(null)
 
+// 生成计时器（让等待期一眼看出在工作，尤其 gemma 首字延迟那十几秒）
+const genSeconds = ref(0)
+let genTimer: number | undefined
+function startTimer() {
+  genSeconds.value = 0
+  const t0 = Date.now()
+  genTimer = window.setInterval(() => {
+    genSeconds.value = Math.floor((Date.now() - t0) / 1000)
+  }, 250)
+}
+function stopTimer() {
+  if (genTimer !== undefined) {
+    clearInterval(genTimer)
+    genTimer = undefined
+  }
+}
+
 // 流式累积的原始文本（代码 tab 实时显示），以及结束后提取的可运行 HTML
 const code = ref('')
 const runningHtml = ref('')
@@ -43,6 +60,11 @@ const iframeEl = ref<HTMLIFrameElement | null>(null)
 const canSend = computed(() => !busy.value && input.value.trim().length > 0)
 const hasProgram = computed(() => runningHtml.value.length > 0)
 const lineCount = computed(() => (code.value ? code.value.split('\n').length : 0))
+// 还没吐出第一个字符（gemma 首字延迟 / thinking 阶段）—— 最容易被误以为坏了
+const thinking = computed(() => busy.value && code.value.length === 0)
+const genStatus = computed(() =>
+  thinking.value ? `正在思考…（${genSeconds.value}s）` : `正在写代码…（${genSeconds.value}s · ${lineCount.value} 行）`,
+)
 
 watch([messages, busy], async () => {
   await nextTick()
@@ -69,6 +91,7 @@ async function send() {
   error.value = null
   messages.value.push({ role: 'user', content: prompt })
   busy.value = true
+  startTimer()
   code.value = ''
   tab.value = 'code' // 切到代码 tab 看它一行行生成
 
@@ -91,6 +114,7 @@ async function send() {
     messages.value.push({ role: 'assistant', content: `出错了：${msg}` })
   } finally {
     busy.value = false
+    stopTimer()
   }
 }
 
@@ -217,7 +241,7 @@ function onKeydown(e: KeyboardEvent) {
         </div>
 
         <div v-if="busy" class="bubble assistant typing">
-          <span /><span /><span /> 正在生成…
+          <span /><span /><span /> {{ genStatus }}
         </div>
       </div>
 
@@ -264,9 +288,15 @@ function onKeydown(e: KeyboardEvent) {
             title="生成的 WebGL 程序"
           />
           <div v-else class="placeholder">
-            <div class="big">▶</div>
-            <p v-if="busy">正在生成，写完自动在这里跑起来…</p>
-            <p v-else>左边说个需求，生成好的程序会在这里运行。</p>
+            <template v-if="busy">
+              <div class="spinner" />
+              <p class="status">{{ genStatus }}</p>
+              <p class="sub">写完会自动在这里跑起来 · 切到 <b>&lt;/&gt; 代码</b> 看 AI 实时写 →</p>
+            </template>
+            <template v-else>
+              <div class="big">▶</div>
+              <p>左边说个需求，生成好的程序会在这里运行。</p>
+            </template>
           </div>
         </div>
 
@@ -274,7 +304,11 @@ function onKeydown(e: KeyboardEvent) {
         <div v-show="tab === 'code'" class="codewrap" ref="codeEl">
           <pre v-if="code" class="code"><code>{{ code }}</code><span v-if="busy" class="caret" /></pre>
           <div v-else class="placeholder small">
-            <p>这里会实时显示 AI 写的代码。</p>
+            <template v-if="busy">
+              <div class="spinner" />
+              <p class="status">{{ genStatus }}</p>
+            </template>
+            <p v-else>这里会实时显示 AI 写的代码。</p>
           </div>
         </div>
       </section>
@@ -469,6 +503,19 @@ function onKeydown(e: KeyboardEvent) {
 }
 .placeholder .big { font-size: 3.2rem; opacity: 0.35; }
 .placeholder.small { position: static; height: 100%; }
+.placeholder .status { color: var(--fg); font-size: 1rem; font-weight: 600; }
+.placeholder .sub { font-size: 0.82rem; opacity: 0.8; }
+.placeholder .sub b { color: var(--fg); }
+.spinner {
+  width: 38px;
+  height: 38px;
+  border-radius: 50%;
+  border: 3px solid var(--border);
+  border-top-color: var(--accent);
+  border-right-color: var(--accent-2);
+  animation: spin 0.8s linear infinite;
+}
+@keyframes spin { to { transform: rotate(360deg); } }
 
 .errorbar {
   padding: 9px 14px;