diff --git a/app/static/public/css/video.css b/app/static/public/css/video.css
index 5dda91c..1dc1784 100644
--- a/app/static/public/css/video.css
+++ b/app/static/public/css/video.css
@@ -661,6 +661,87 @@ body {
   background: #fafafa;
 }
 
+#cacheVideoModal.modal-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 80;
+  background: transparent;
+}
+
+#cacheVideoModal.hidden {
+  display: none;
+}
+
+#cacheVideoModal .modal-content {
+  position: fixed;
+  width: min(560px, calc(100vw - 24px));
+  max-height: min(72vh, 560px);
+  border-radius: 12px;
+  border: 1px solid var(--video-outline);
+  background: var(--video-surface);
+  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.18);
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+#cacheVideoModal .modal-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 10px;
+  padding: 10px 12px;
+  border-bottom: 1px solid var(--video-outline);
+}
+
+#cacheVideoModal .modal-title {
+  font-size: 13px;
+  font-weight: 600;
+  color: var(--accents-7);
+}
+
+#cacheVideoModal .modal-close {
+  width: 28px;
+  height: 28px;
+  border-radius: 8px;
+  border: 1px solid var(--video-outline);
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+
+#cacheVideoModal .modal-close:hover {
+  background: var(--video-muted);
+}
+
+html[data-theme='dark'] #cacheVideoModal .modal-content {
+  background: #131a24;
+  border-color: #2b3440;
+  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.45);
+}
+
+html[data-theme='dark'] #cacheVideoModal .modal-title {
+  color: #e6edf3;
+}
+
+html[data-theme='dark'] #cacheVideoModal .modal-close {
+  border-color: #2b3440;
+  color: #e6edf3;
+}
+
+html[data-theme='dark'] #cacheVideoModal .modal-close:hover {
+  background: #1b2432;
+}
+
+html[data-theme='dark'] .cache-video-list {
+  background: #131a24;
+  border-color: #2b3440;
+}
+
+html[data-theme='dark'] .cache-video-item {
+  border-bottom-color: #2b3440;
+}
+
 .cache-video-item {
   display: flex;
   align-items: center;
diff --git a/app/static/public/js/video.js b/app/static/public/js/video.js
index a4fd262..fcbe8c8 100644
--- a/app/static/public/js/video.js
+++ b/app/static/public/js/video.js
@@ -91,6 +91,7 @@
   let mergeCutMsA = 0;
   let mergeCutMsB = 0;
   let cacheModalPickMode = 'edit';
+  let cacheModalAnchorEl = null;
 
   function toast(message, type) {
     if (typeof showToast === 'function') {
@@ -1093,16 +1094,44 @@
     if (editBody) editBody.classList.remove('hidden');
   }
 
-  function openCacheVideoModal() {
+  function positionCacheVideoModal() {
     if (!cacheVideoModal) return;
+    const content = cacheVideoModal.querySelector('.modal-content');
+    if (!(content instanceof HTMLElement)) return;
+    const anchor = cacheModalAnchorEl instanceof HTMLElement ? cacheModalAnchorEl : null;
+    if (!anchor) return;
+    const rect = anchor.getBoundingClientRect();
+    const margin = 8;
+    const vw = window.innerWidth || document.documentElement.clientWidth || 0;
+    const vh = window.innerHeight || document.documentElement.clientHeight || 0;
+    const width = Math.min(560, Math.max(280, vw - 24));
+    let left = rect.left;
+    if (left + width > vw - 12) {
+      left = vw - 12 - width;
+    }
+    if (left < 12) left = 12;
+    let top = rect.bottom + margin;
+    const maxTop = vh - 120;
+    if (top > maxTop) {
+      top = Math.max(12, rect.top - margin - 420);
+    }
+    content.style.left = `${Math.round(left)}px`;
+    content.style.top = `${Math.round(top)}px`;
+  }
+
+  function openCacheVideoModal(anchorEl) {
+    if (!cacheVideoModal) return;
+    cacheModalAnchorEl = anchorEl instanceof HTMLElement ? anchorEl : null;
     cacheVideoModal.classList.remove('hidden');
     cacheVideoModal.classList.add('is-open');
+    positionCacheVideoModal();
   }
 
   function closeCacheVideoModal() {
     if (!cacheVideoModal) return;
     cacheVideoModal.classList.remove('is-open');
     cacheVideoModal.classList.add('hidden');
+    cacheModalAnchorEl = null;
   }
 
   function formatBytes(bytes) {
@@ -2026,7 +2055,7 @@
     pickCachedVideoBtn.addEventListener('click', async () => {
       try {
         cacheModalPickMode = 'edit';
-        openCacheVideoModal();
+        openCacheVideoModal(pickCachedVideoBtn);
         if (cacheVideoList) {
           cacheVideoList.innerHTML = '<div class="video-empty">正在读取缓存视频...</div>';
         }
@@ -2045,7 +2074,7 @@
     pickMergeVideoBtn.addEventListener('click', async () => {
       try {
         cacheModalPickMode = 'merge_target';
-        openCacheVideoModal();
+        openCacheVideoModal(pickMergeVideoBtn);
         if (cacheVideoList) {
           cacheVideoList.innerHTML = '<div class="video-empty">正在读取缓存视频...</div>';
         }
@@ -2073,6 +2102,18 @@
     });
   }
 
+  window.addEventListener('resize', () => {
+    if (cacheVideoModal && !cacheVideoModal.classList.contains('hidden')) {
+      positionCacheVideoModal();
+    }
+  });
+
+  window.addEventListener('scroll', () => {
+    if (cacheVideoModal && !cacheVideoModal.classList.contains('hidden')) {
+      positionCacheVideoModal();
+    }
+  }, { passive: true });
+
   if (cacheVideoList) {
     cacheVideoList.addEventListener('click', (event) => {
       const target = event.target;
diff --git a/app/static/public/pages/video.html b/app/static/public/pages/video.html
index a64a8de..01ee717 100644
--- a/app/static/public/pages/video.html
+++ b/app/static/public/pages/video.html
@@ -18,7 +18,7 @@
   <link href="https://cdn.jsdelivr.net/npm/geist@1.0.0/dist/fonts/geist-mono/style.css" rel="stylesheet">
   <script src="/static/common/js/theme.js?v=0.1.0"></script>
   <link href="/static/common/css/common.css?v=0.3.7" rel="stylesheet">
-  <link href="/static/public/css/video.css?v=0.4.0" rel="stylesheet">
+  <link href="/static/public/css/video.css?v=0.4.1" rel="stylesheet">
   <link href="/static/common/css/toast.css" rel="stylesheet">
 </head>
 
@@ -315,7 +315,7 @@
   <script src="/static/common/js/pwa.js?v=0.1.1"></script>
   <script src="/static/vendor/ffmpeg/ffmpeg.js?v=0.1.0"></script>
   <script src="/static/vendor/ffmpeg/ffmpeg-util.js?v=0.1.0"></script>
-  <script src="/static/public/js/video.js?v=0.5.2"></script>
+  <script src="/static/public/js/video.js?v=0.5.3"></script>
 </body>
 
 </html>