diff --git a/.memory/worklog.json b/.memory/worklog.json
index 5258033..501ac95 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -2927,6 +2927,19 @@
       "type": "session-heartbeat",
       "message": "Claude 会话活跃 · 最近命令：claude · 1 项未提交变更 · 最近提交：auto-save 2026-05-14 02:30 (+2, ~4)",
       "files_changed": 1
+    },
+    {
+      "ts": "2026-05-14T02:36:34+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-14 02:36 (~2)",
+      "hash": "2b7eb00",
+      "files_changed": 2
+    },
+    {
+      "ts": "2026-05-13T18:38:48Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 4 项未提交变更 · 最近提交：auto-save 2026-05-14 02:36 (~2)",
+      "files_changed": 4
     }
   ]
 }
diff --git a/docs/source-analysis.html b/docs/source-analysis.html
index f4dc303..e041afa 100644
--- a/docs/source-analysis.html
+++ b/docs/source-analysis.html
@@ -815,6 +815,18 @@ api/main.py
         <h2>变更记录</h2>
         <p>这个记录不是 git log 的替代品。它记录“产品理解发生了什么变化、影响了哪些源码、你以后描述需求时该怎么说”。后续每次改功能都要补一条。</p>
         <div class="changelog">
+          <article class="change">
+            <header>
+              <h3>2026-05-14 · 缩略图滑动条改为大号可拖轨道</h3>
+              <span class="tag violet">Canvas</span>
+              <span class="tag blue">Thumbnail</span>
+            </header>
+            <div class="body">
+              <p><strong>问题：</strong>节点上方缩略图横排内容多时，原生横向滚动条太细且在画布缩放下不容易点中，用户很难拖动。</p>
+              <p><strong>改动：</strong>新增 <code>FloatingThumbnailStrip</code> / <code>ThumbnailScrollRail</code>，在缩略图下方显示明显的大号紫色拖动轨道；轨道支持点击跳转、按住拖动和键盘左右移动，并用 <code>nodrag nopan</code> 避免误触发画布拖拽。</p>
+              <p><strong>影响：</strong><code>web/components/nodes/index.tsx</code>、<code>web/app/globals.css</code>、<code>docs/source-analysis.html</code>。Input、VisualLab 以及保留的旧视觉节点缩略图条共用同一交互。</p>
+            </div>
+          </article>
           <article class="change">
             <header>
               <h3>2026-05-14 · 三个视觉节点合并为画面工作台</h3>
diff --git a/web/app/globals.css b/web/app/globals.css
index d550dd8..ea5bbf9 100644
--- a/web/app/globals.css
+++ b/web/app/globals.css
@@ -409,3 +409,23 @@
 .react-flow__node .overflow-x-auto::-webkit-scrollbar-thumb:active {
   background: rgba(217, 70, 239, 0.95);
 }
+
+.react-flow__node .thumbnail-strip {
+  scrollbar-width: none;
+  overscroll-behavior-x: contain;
+}
+
+.react-flow__node .thumbnail-strip::-webkit-scrollbar {
+  width: 0;
+  height: 0;
+  display: none;
+}
+
+.react-flow__node .thumbnail-scroll-rail {
+  touch-action: none;
+}
+
+.react-flow__node .thumbnail-scroll-rail:hover > div,
+.react-flow__node .thumbnail-scroll-rail:focus-visible > div {
+  background: rgb(216, 180, 254);
+}
diff --git a/web/components/nodes/index.tsx b/web/components/nodes/index.tsx
index 2bedfd9..4fc4a4d 100644
--- a/web/components/nodes/index.tsx
+++ b/web/components/nodes/index.tsx
@@ -149,7 +149,7 @@ function ThumbnailScrollRail({
       const max = Math.max(0, el.scrollWidth - el.clientWidth)
       const visible = max > 2
       const widthPct = visible
-        ? Math.max(18, Math.min(92, (el.clientWidth / Math.max(el.scrollWidth, 1)) * 100))
+        ? Math.max(26, Math.min(92, (el.clientWidth / Math.max(el.scrollWidth, 1)) * 100))
         : 100
       const leftPct = visible ? (el.scrollLeft / max) * (100 - widthPct) : 0
       const next = {
@@ -207,10 +207,10 @@ function ThumbnailScrollRail({
       aria-valuemax={rail.max}
       aria-valuenow={rail.now}
       tabIndex={0}
-      className={`thumbnail-scroll-rail nodrag nopan relative mt-2 h-5 rounded-full border shadow-[0_10px_24px_rgba(0,0,0,0.28)] outline-none transition ${
+      className={`thumbnail-scroll-rail nodrag nopan relative mt-2.5 h-9 rounded-full border shadow-[0_14px_28px_rgba(0,0,0,0.34),0_0_0_1px_rgba(255,255,255,0.08)] outline-none transition ${
         dragging
-          ? "cursor-grabbing border-violet-200/80 bg-violet-950/80 ring-2 ring-violet-300/70"
-          : "cursor-grab border-white/20 bg-black/50 hover:border-violet-300/75 hover:bg-violet-950/60 focus-visible:border-violet-200 focus-visible:ring-2 focus-visible:ring-violet-300/70"
+          ? "cursor-grabbing border-violet-100/95 bg-violet-500/55 ring-2 ring-violet-100/80"
+          : "cursor-grab border-violet-200/70 bg-violet-500/32 hover:border-violet-100/90 hover:bg-violet-400/45 focus-visible:border-violet-100 focus-visible:ring-2 focus-visible:ring-violet-100/80"
       }`}
       onPointerDown={(e) => {
         const el = scrollRef.current
@@ -282,7 +282,7 @@ function ThumbnailScrollRail({
       }}
     >
       <div
-        className="absolute bottom-[3px] top-[3px] rounded-full bg-violet-300 shadow-[0_0_0_1px_rgba(255,255,255,0.45),0_0_18px_rgba(167,139,250,0.65)] transition-colors"
+        className="absolute bottom-[6px] top-[6px] rounded-full bg-white shadow-[0_0_0_1px_rgba(255,255,255,0.78),0_0_24px_rgba(216,180,254,0.86)] transition-colors"
         style={{ left: `${rail.leftPct}%`, width: `${rail.widthPct}%` }}
       />
     </div>
@@ -1537,10 +1537,7 @@ export function StoryboardNode({ data, selected }: any) {
     <div ref={rootRef} className="relative" style={{ width: "100%", height: "100%" }}>
       {/* 节点上方：所有元素 crop 图（编排输入素材）— 视觉类节点统一样板：单行横滚 + 左上复制 + 右上删除 + hover/click pin 大预览 */}
       {elementCrops.length > 0 && job && (
-        <div
-          className="absolute left-0 right-0 flex items-end gap-1.5 overflow-x-auto pb-1.5"
-          style={{ bottom: "calc(100% + 12px)" }}
-        >
+        <FloatingThumbnailStrip label="元素缩略图横向滑动条">
           {elementCrops.map((p) => {
             const key = `${p.frameIdx}_${p.elementId}`
             return (
@@ -1606,7 +1603,7 @@ export function StoryboardNode({ data, selected }: any) {
               </div>
             )
           })}
-        </div>
+        </FloatingThumbnailStrip>
       )}
 
       {(() => {
@@ -1686,10 +1683,7 @@ export function VideoGenNode({ data, selected }: any) {
   return (
     <div ref={rootRef} className="relative" style={{ width: "100%", height: "100%" }}>
       {videos.length > 0 && (
-        <div
-          className="absolute left-0 right-0 flex items-end gap-1.5 overflow-x-auto pb-1.5"
-          style={{ bottom: "calc(100% + 12px)" }}
-        >
+        <FloatingThumbnailStrip label="生成视频缩略图横向滑动条">
           {videos.map((v, i) => {
             const videoSrc = apiAssetUrl(v.url)
             const posterSrc = apiAssetUrl(v.poster_url)
@@ -1771,7 +1765,7 @@ export function VideoGenNode({ data, selected }: any) {
               </button>
             </div>
           )})}
-        </div>
+        </FloatingThumbnailStrip>
       )}
       {(() => {
         if (!hoverPreviewVideo) return null