diff --git a/src/App.vue b/src/App.vue
index fa1e920..b5c4560 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1222,6 +1222,9 @@ async function handleVoiceQueryComplete(text: string) {
 
 /* 平板/大屏 (769px+) */
 @media (min-width: 769px) {
+  .subtitle-overlay {
+    width: 80%;
+  }
 }
 
 /* 横屏模式 */
diff --git a/src/components/SubtitlePanel.vue b/src/components/SubtitlePanel.vue
index 806e831..13544ef 100644
--- a/src/components/SubtitlePanel.vue
+++ b/src/components/SubtitlePanel.vue
@@ -316,20 +316,59 @@ const aiSubtitleTextRef = ref<HTMLElement | null>(null);
 const aiFontSize = ref(18);
 const aiTextOverflow = ref(false);
 
-// 计算AI字幕字号：根据文本长度动态调整
+// 检测是否为 1440×2560 目标分辨率
+const isTargetResolution = ref(false);
+
+/**
+ * 检测当前视口是否为 1440×2560 分辨率
+ * 使用 window.innerWidth 和 innerHeight 精确匹配
+ */
+const checkResolution = () => {
+  const TARGET_WIDTH = 1440;
+  const TARGET_HEIGHT = 2560;
+  console.log("------------", window.innerWidth, window.innerHeight);
+  isTargetResolution.value =
+    (window.innerWidth === TARGET_WIDTH &&
+      window.innerHeight === TARGET_HEIGHT) ||
+    (window.innerWidth > 1000 && window.innerHeight > 1680);
+};
+
+/**
+ * 获取目标分辨率下的字号基准值
+ * 1440×2560 下使用更大的字号以确保清晰可读
+ */
+const getTargetFontSizeBase = (textLength: number): number => {
+  if (textLength <= 50) return 36;
+  if (textLength <= 100) return 32;
+  if (textLength <= 200) return 28;
+  if (textLength <= 400) return 24;
+  return 22;
+};
+
+/**
+ * 获取普通分辨率下的字号基准值
+ */
+const getNormalFontSizeBase = (textLength: number): number => {
+  if (textLength <= 50) return 18;
+  if (textLength <= 100) return 16;
+  if (textLength <= 200) return 14;
+  if (textLength <= 400) return 13;
+  return 12;
+};
+
+// 计算AI字幕字号：根据分辨率和文本长度动态调整
 const computeAIFontSize = () => {
   const text = props.aiSubtitle;
+  console.log("------------", text);
   if (!text) {
-    aiFontSize.value = 18;
+    aiFontSize.value = isTargetResolution.value ? 36 : 18;
     return;
   }
 
   const len = text.length;
-  if (len <= 50) aiFontSize.value = 18;
-  else if (len <= 100) aiFontSize.value = 16;
-  else if (len <= 200) aiFontSize.value = 14;
-  else if (len <= 400) aiFontSize.value = 13;
-  else aiFontSize.value = 12;
+  aiFontSize.value = isTargetResolution.value
+    ? getTargetFontSizeBase(len)
+    : getNormalFontSizeBase(len);
 };
 
 // 检测AI字幕是否溢出
@@ -400,12 +439,30 @@ const handleClickOutside = (e: MouseEvent) => {
   }
 };
 
+/**
+ * 处理视口尺寸变化：重新检测分辨率并更新字号
+ */
+const handleResize = () => {
+  const wasTarget = isTargetResolution.value;
+  checkResolution();
+  // 如果分辨率状态变化，重新计算字号
+  if (wasTarget !== isTargetResolution.value) {
+    computeAIFontSize();
+  }
+};
+
 onMounted(() => {
   document.addEventListener("click", handleClickOutside);
+  // 初始检测分辨率
+  checkResolution();
+  computeAIFontSize();
+  // 监听视口尺寸变化
+  window.addEventListener("resize", handleResize);
 });
 
 onBeforeUnmount(() => {
   document.removeEventListener("click", handleClickOutside);
+  window.removeEventListener("resize", handleResize);
 });
 
 // ===== 消息配对 =====
@@ -790,6 +847,7 @@ const scrollToBottom = () => {
 .bubble-text {
   font-size: 14px;
   line-height: 1.6;
+  letter-spacing: 0.2px;
   word-break: break-word;
   overflow: hidden;
   transition: max-height 0.35s ease;
@@ -874,6 +932,7 @@ const scrollToBottom = () => {
 .merged-text {
   font-size: 14px;
   line-height: 1.6;
+  letter-spacing: 0.2px;
   word-break: break-word;
   overflow: hidden;
   transition: max-height 0.35s ease;
@@ -904,4 +963,129 @@ const scrollToBottom = () => {
     }
   }
 }
+
+/* ===== 1440×2560 分辨率专用样式 ===== */
+@media (min-width: 1000px) and (min-height: 1680px) {
+  /* 一级正文：气泡/合并文本/占位符 */
+  .bubble-text,
+  .merged-text,
+  .subtitle-placeholder {
+    font-size: 24px;
+    line-height: 1.75;
+    letter-spacing: 0.5px;
+    font-weight: 400;
+  }
+
+  /* AI字幕：字号由 JavaScript 动态控制，此处仅设置辅助样式 */
+  .ai-subtitle-text {
+    line-height: 1.75;
+    letter-spacing: 0.6px;
+    font-weight: 400;
+    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.7);
+  }
+
+  /* 二级UI：下拉框/菜单项 */
+  .dropdown-trigger,
+  .dropdown-item {
+    font-size: 20px;
+    font-weight: 500;
+  }
+
+  /* 三级辅助：展开按钮 */
+  .expand-btn {
+    font-size: 17px;
+    padding: 6px 18px;
+  }
+
+  /* 字幕容器：背景与边框适配大字号 */
+  .ai-subtitle-bar {
+    padding: 18px 24px;
+    border-radius: 12px;
+    background: linear-gradient(
+      135deg,
+      rgba(108, 140, 255, 0.12) 0%,
+      rgba(79, 110, 247, 0.06) 100%
+    );
+    border: 1px solid rgba(108, 140, 255, 0.15);
+  }
+
+  /* 气泡容器：间距与圆角适配 */
+  .bubble-body {
+    padding: 16px 20px;
+    border-radius: 20px;
+  }
+
+  .chat-bubble.bubble-user .bubble-body {
+    border-radius: 20px 20px 6px 20px;
+    margin-left: 36px;
+  }
+
+  .chat-bubble.bubble-ai .bubble-body {
+    border-radius: 20px 20px 20px 6px;
+    margin-right: 36px;
+  }
+
+  .merged-bubble {
+    border-radius: 18px;
+  }
+
+  .merged-user-section,
+  .merged-ai-section {
+    padding: 16px 20px;
+  }
+
+  /* 头部区域：间距放大 */
+  .subtitle-header {
+    padding-bottom: 14px;
+    margin-bottom: 14px;
+  }
+
+  .dropdown-trigger {
+    padding: 14px 22px;
+    border-radius: 14px;
+  }
+
+  .dropdown-item {
+    padding: 16px 22px;
+    border-radius: 12px;
+  }
+
+  /* 下拉菜单宽度适配 */
+  .dropdown-menu {
+    min-width: 240px;
+    padding: 8px;
+    border-radius: 16px;
+  }
+
+  /* 滚动指示器：尺寸适配 */
+  .scroll-hint {
+    width: 40px;
+    height: 40px;
+    margin-top: 12px;
+  }
+
+  /* 聊天列表间距 */
+  .chat-list {
+    gap: 12px;
+  }
+
+  .merged-list {
+    gap: 12px;
+  }
+
+  .bubble-text {
+    font-size: 28px !important;
+  }
+
+  /* 折叠高度适配（按新字号比例） */
+  .bubble-text.collapsed,
+  .merged-text.collapsed {
+    max-height: 6em;
+  }
+
+  .bubble-text.collapsed::after,
+  .merged-text.collapsed::after {
+    height: 3em;
+  }
+}
 </style>