diff --git a/web/src/components/QuestionFloatButton.module.less b/web/src/components/QuestionFloatButton.module.less
index c4ee41f..c4ff246 100644
--- a/web/src/components/QuestionFloatButton.module.less
+++ b/web/src/components/QuestionFloatButton.module.less
@@ -93,8 +93,8 @@
   position: absolute;
   top: 0;
   left: 0;
-  width: 64px;
-  height: 64px;
+  width: 100%;
+  height: 100%;
   transform: rotate(-90deg);
   pointer-events: none;
 }
@@ -135,8 +135,9 @@
 
   .statsCard {
     padding: 6px 12px;
-    gap: 10px;
+    gap: 8px;
     border-radius: 10px;
+    font-size: 12px;
   }
 
   .statsLabel {
@@ -144,11 +145,11 @@
   }
 
   .statsValue {
-    font-size: 14px;
+    font-size: 13px;
   }
 
   .statsDivider {
-    height: 18px;
+    height: 16px;
   }
 
   .floatButton {
@@ -156,13 +157,43 @@
     height: 58px;
   }
 
-  .progressRing {
-    width: 58px;
-    height: 58px;
+  .icon {
+    font-size: 22px;
+  }
+}
+
+// 超小屏幕优化
+@media (max-width: 380px) {
+  .floatButtonWrapper {
+    right: 12px;
+    bottom: 75px;
+  }
+
+  .statsCard {
+    padding: 5px 10px;
+    gap: 6px;
+    border-radius: 8px;
+  }
+
+  .statsLabel {
+    font-size: 9px;
+  }
+
+  .statsValue {
+    font-size: 12px;
+  }
+
+  .statsDivider {
+    height: 14px;
+  }
+
+  .floatButton {
+    width: 54px;
+    height: 54px;
   }
 
   .icon {
-    font-size: 22px;
+    font-size: 20px;
   }
 }
 
diff --git a/web/src/components/QuestionFloatButton.tsx b/web/src/components/QuestionFloatButton.tsx
index b0b0ed4..7d78057 100644
--- a/web/src/components/QuestionFloatButton.tsx
+++ b/web/src/components/QuestionFloatButton.tsx
@@ -32,7 +32,7 @@ const QuestionFloatButton: React.FC<QuestionFloatButtonProps> = ({
         <div className={styles.statsRow}>
           <span className={styles.statsLabel}>进度</span>
           <span className={styles.statsValue}>
-            {currentIndex + 1}/{totalQuestions}
+            {answeredCount}/{totalQuestions}
           </span>
         </div>
         <div className={styles.statsDivider} />
@@ -54,7 +54,7 @@ const QuestionFloatButton: React.FC<QuestionFloatButtonProps> = ({
       {/* 悬浮球 */}
       <div className={styles.floatButton} onClick={onClick}>
         {/* 进度环 */}
-        <svg className={styles.progressRing} width="64" height="64">
+        <svg className={styles.progressRing} viewBox="0 0 64 64">
           <circle
             className={styles.progressRingCircle}
             strokeWidth="3"
diff --git a/web/src/pages/Question.tsx b/web/src/pages/Question.tsx
index 490da88..6b55873 100644
--- a/web/src/pages/Question.tsx
+++ b/web/src/pages/Question.tsx
@@ -303,10 +303,25 @@ const QuestionPage: React.FC = () => {
 
       // 随机模式：从题库中随机选择一题
       if (randomMode) {
-        // 生成一个不等于当前索引的随机索引
-        do {
-          nextIndex = Math.floor(Math.random() * allQuestions.length);
-        } while (nextIndex === currentIndex && allQuestions.length > 1);
+        // 获取所有未答题目的索引
+        const unansweredIndexes: number[] = [];
+        for (let i = 0; i < allQuestions.length; i++) {
+          if (!answeredStatus.has(i)) {
+            unansweredIndexes.push(i);
+          }
+        }
+
+        // 如果所有题目都已回答，显示总结页面
+        if (unansweredIndexes.length === 0) {
+          setShowSummary(true);
+          // 清除进度
+          localStorage.removeItem(getStorageKey());
+          return;
+        }
+
+        // 从未答题目中随机选择一题
+        const randomIdx = Math.floor(Math.random() * unansweredIndexes.length);
+        nextIndex = unansweredIndexes[randomIdx];
       } else {
         // 顺序模式：检查是否完成所有题目
         if (currentIndex + 1 >= allQuestions.length) {