diff --git a/.memory/worklog.json b/.memory/worklog.json
index 09201a4..adb88ef 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1649,6 +1649,19 @@
       "message": "auto-save 2026-05-13 14:10 (~2)",
       "hash": "6d87afa",
       "files_changed": 2
+    },
+    {
+      "ts": "2026-05-13T14:16:19+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-13 14:16 (~1)",
+      "hash": "4983d9a",
+      "files_changed": 1
+    },
+    {
+      "ts": "2026-05-13T06:17:39Z",
+      "type": "session-heartbeat",
+      "message": "Claude 会话活跃 · 最近命令：claude · 2 项未提交变更 · 最近提交：auto-save 2026-05-13 14:16 (~1)",
+      "files_changed": 2
     }
   ]
 }
diff --git a/web/components/nodes/index.tsx b/web/components/nodes/index.tsx
index e72913c..b30fd98 100644
--- a/web/components/nodes/index.tsx
+++ b/web/components/nodes/index.tsx
@@ -1,5 +1,6 @@
 "use client"
-import { useRef, useState } from "react"
+import { useEffect, useRef, useState } from "react"
+import { createPortal } from "react-dom"
 import { type NodeProps } from "@xyflow/react"
 import {
   Link2, Upload, Download, Scissors, Image as ImageIcon,
@@ -345,6 +346,9 @@ export function KeyframeNode({ data, selected }: any) {
   const st = keyframeStatus(d.job)
   const frames = d.job?.frames ?? []
   const jobId = d.job?.id
+  const [hover, setHover] = useState<{ idx: number; rect: DOMRect } | null>(null)
+  const [mounted, setMounted] = useState(false)
+  useEffect(() => setMounted(true), [])
 
   return (
     <div className="relative" style={{ width: KEYFRAME_WIDTH }}>
@@ -372,7 +376,9 @@ export function KeyframeNode({ data, selected }: any) {
               >
               <button
                 onClick={(e) => { e.stopPropagation(); d.onExpandFrame(f.index) }}
-                title={`第 ${f.index + 1} 张 · ${f.timestamp.toFixed(1)}s · 点击放大`}
+                onMouseEnter={(e) => setHover({ idx: f.index, rect: (e.currentTarget as HTMLElement).getBoundingClientRect() })}
+                onMouseLeave={() => setHover(null)}
+                title={`第 ${f.index + 1} 张 · ${f.timestamp.toFixed(1)}s · hover 看大图 · 点击精细调整`}
                 className="absolute inset-0 w-full h-full"
               >
                 <img
@@ -383,7 +389,6 @@ export function KeyframeNode({ data, selected }: any) {
                 {isSel && (
                   <div className="absolute inset-0 bg-emerald-400/15 rounded-md pointer-events-none" />
                 )}
-                {/* 左上角：已清洗 + 抠图数 */}
                 {(f.cleaned_url || (f.elements?.some((e) => e.cutout_id))) && (
                   <div className="absolute top-0 left-0 flex items-center gap-0.5 px-1 py-0.5 rounded-br-md leading-none">
                     {f.cleaned_url && (
@@ -399,40 +404,9 @@ export function KeyframeNode({ data, selected }: any) {
                     })()}
                   </div>
                 )}
-                {/* 时间戳 */}
                 <div className="absolute bottom-0 right-0 bg-black/70 text-white text-[8.5px] font-mono px-1 py-0.5 leading-none rounded-bl rounded-br-md">
                   {f.timestamp.toFixed(1)}s
                 </div>
-
-                {/* Hover 静态大图预览（关键帧素材给下游分镜头编排用） */}
-                <div
-                  className="pointer-events-none absolute opacity-0 group-hover:opacity-100 scale-95 group-hover:scale-100 transition-all duration-200 z-[60]"
-                  style={{
-                    bottom: "calc(100% + 10px)",
-                    left: "50%",
-                    transform: "translateX(-50%)",
-                    transformOrigin: "bottom center",
-                  }}
-                >
-                  <div className="rounded-2xl overflow-hidden border border-white/25 bg-black" style={{ boxShadow: "0 40px 100px -20px rgba(0,0,0,0.85), 0 0 0 1px rgba(255,255,255,0.06)" }}>
-                    <img
-                      src={effectiveFrameUrl(jobId, f)}
-                      alt={`preview ${f.index}`}
-                      className="block"
-                      style={{
-                        width: KEYFRAME_WIDTH * 2,
-                        maxWidth: "min(720px, 80vw)",
-                        height: "auto",
-                        maxHeight: "82vh",
-                        objectFit: "contain",
-                      }}
-                    />
-                    <div className="flex items-center justify-between px-3 py-2 bg-black/70 backdrop-blur-md">
-                      <span className="text-white text-[12.5px] font-medium">分镜 {f.index + 1}</span>
-                      <span className="text-white/60 text-[11px] font-mono">{f.timestamp.toFixed(2)}s · 静态帧</span>
-                    </div>
-                  </div>
-                </div>
               </button>
               {/* 删除按钮：hover 时右上角浮出 */}
               {d.onDeleteFrame && (
@@ -486,6 +460,45 @@ export function KeyframeNode({ data, selected }: any) {
           </div>
         )}
       </NodeShell>
+
+      {/* Portal hover 大预览 — 浮在缩略图上方（不挡其他界面） */}
+      {mounted && hover && jobId && (() => {
+        const hf = frames.find((x) => x.index === hover.idx)
+        if (!hf) return null
+        // 大图最大尺寸（按视频比例算）
+        const vidAspect = d.job && d.job.height > 0 ? d.job.height / d.job.width : 16 / 9
+        const maxH = Math.min(window.innerHeight * 0.7, hover.rect.top - 16)
+        const maxW = Math.min(window.innerWidth * 0.6, 600)
+        let h = maxH, w = h / vidAspect
+        if (w > maxW) { w = maxW; h = w * vidAspect }
+        // 水平居中到缩略图，clamp 在视口内
+        const centerX = hover.rect.left + hover.rect.width / 2
+        const left = Math.max(12, Math.min(window.innerWidth - w - 12, centerX - w / 2))
+        return createPortal(
+          <div
+            className="fixed z-[120] pointer-events-none"
+            style={{
+              top: hover.rect.top - h - 12,
+              left,
+              animation: "drawer-in 0.18s cubic-bezier(0.32, 0.72, 0, 1)",
+            }}
+          >
+            <div className="rounded-2xl overflow-hidden border border-white/25 bg-black" style={{ boxShadow: "0 30px 80px -10px rgba(0,0,0,0.85), 0 0 0 1px rgba(255,255,255,0.06)" }}>
+              <img
+                src={effectiveFrameUrl(jobId, hf)}
+                alt={`preview ${hf.index}`}
+                className="block"
+                style={{ width: w, height: h, objectFit: "contain" }}
+              />
+              <div className="flex items-center justify-between px-3 py-2 bg-black/70 backdrop-blur-md">
+                <span className="text-white text-[12.5px] font-medium">分镜 {hf.index + 1} · {hf.timestamp.toFixed(2)}s</span>
+                <span className="text-white/60 text-[11px] font-mono">点击进入精细调整</span>
+              </div>
+            </div>
+          </div>,
+          document.body,
+        )
+      })()}
     </div>
   )
 }
@@ -589,6 +602,9 @@ const IMAGEGEN_WIDTH = 360
 export function ImageGenNode({ data, selected }: any) {
   const d: NodeData = data
   const job = d?.job
+  const [hover, setHover] = useState<{ key: string; rect: DOMRect } | null>(null)
+  const [mounted, setMounted] = useState(false)
+  useEffect(() => setMounted(true), [])
 
   // 上方浮条 = 所有 frame 的 elements crop（"分镜头编排"的输入素材）
   type ElPreview = { frameIdx: number; elementId: string; name: string }
@@ -612,55 +628,30 @@ export function ImageGenNode({ data, selected }: any) {
           className="absolute left-0 right-0 grid grid-cols-5 gap-1.5"
           style={{ bottom: "calc(100% + 12px)" }}
         >
-          {elementCrops.map((p) => (
-            <div
-              key={`${p.frameIdx}_${p.elementId}`}
-              className="group relative rounded-md border border-violet-300/50 transition shadow-lg hover:-translate-y-0.5 bg-black/40 overflow-hidden"
-              style={{ aspectRatio: aspect }}
-            >
-              <button
-                onClick={(e) => { e.stopPropagation(); d.onOpenStoryboard?.(p.frameIdx) }}
-                title={`${p.name} · 来自分镜 ${p.frameIdx + 1} · 点击进入分镜头编排`}
-                className="absolute inset-0 w-full h-full"
+          {elementCrops.map((p) => {
+            const key = `${p.frameIdx}_${p.elementId}`
+            return (
+              <div
+                key={key}
+                className="relative rounded-md border border-violet-300/50 transition shadow-lg hover:-translate-y-0.5 bg-black/40 overflow-hidden"
+                style={{ aspectRatio: aspect }}
               >
-                <img
-                  src={cutoutUrl(job.id, p.frameIdx, p.elementId)}
-                  alt={p.name}
-                  className="absolute inset-0 w-full h-full object-contain"
-                />
-
-                {/* Hover 大图预览 — 跟 keyframe 样式一致 */}
-                <div
-                  className="pointer-events-none absolute opacity-0 group-hover:opacity-100 scale-95 group-hover:scale-100 transition-all duration-200 z-[60]"
-                  style={{
-                    bottom: "calc(100% + 10px)",
-                    left: "50%",
-                    transform: "translateX(-50%)",
-                    transformOrigin: "bottom center",
-                  }}
+                <button
+                  onClick={(e) => { e.stopPropagation(); d.onOpenStoryboard?.(p.frameIdx) }}
+                  onMouseEnter={(e) => setHover({ key, rect: (e.currentTarget as HTMLElement).getBoundingClientRect() })}
+                  onMouseLeave={() => setHover(null)}
+                  title={`${p.name} · 来自分镜 ${p.frameIdx + 1} · hover 看大图 · 点击进入分镜头编排`}
+                  className="absolute inset-0 w-full h-full"
                 >
-                  <div className="rounded-2xl overflow-hidden border border-white/25 bg-black" style={{ boxShadow: "0 40px 100px -20px rgba(0,0,0,0.85), 0 0 0 1px rgba(255,255,255,0.06)" }}>
-                    <img
-                      src={cutoutUrl(job.id, p.frameIdx, p.elementId)}
-                      alt={`preview ${p.elementId}`}
-                      className="block"
-                      style={{
-                        width: IMAGEGEN_WIDTH * 2,
-                        maxWidth: "min(720px, 80vw)",
-                        height: "auto",
-                        maxHeight: "82vh",
-                        objectFit: "contain",
-                      }}
-                    />
-                    <div className="flex items-center justify-between px-3 py-2 bg-black/70 backdrop-blur-md">
-                      <span className="text-white text-[12.5px] font-medium">{p.name}</span>
-                      <span className="text-white/60 text-[11px] font-mono">来自分镜 {p.frameIdx + 1}</span>
-                    </div>
-                  </div>
-                </div>
-              </button>
-            </div>
-          ))}
+                  <img
+                    src={cutoutUrl(job.id, p.frameIdx, p.elementId)}
+                    alt={p.name}
+                    className="absolute inset-0 w-full h-full object-contain"
+                  />
+                </button>
+              </div>
+            )
+          })}
         </div>
       )}
 
@@ -688,6 +679,41 @@ export function ImageGenNode({ data, selected }: any) {
           </div>
         )}
       </NodeShell>
+
+      {/* Portal hover 大预览 — 视口居中 */}
+      {mounted && hoverKey && job && (() => {
+        const [fi, ei] = hoverKey.split("_")
+        const frameIdx = parseInt(fi, 10)
+        const p = elementCrops.find((x) => x.frameIdx === frameIdx && x.elementId === ei)
+        if (!p) return null
+        return createPortal(
+          <div
+            className="fixed inset-0 z-[120] pointer-events-none flex items-center justify-center p-6"
+            style={{ animation: "drawer-in 0.18s cubic-bezier(0.32, 0.72, 0, 1)" }}
+          >
+            <div className="absolute inset-0 bg-black/40 backdrop-blur-sm" />
+            <div className="relative rounded-2xl overflow-hidden border border-violet-300/40 bg-black" style={{ boxShadow: "0 50px 120px -10px rgba(0,0,0,0.9), 0 0 0 1px rgba(255,255,255,0.06)" }}>
+              <img
+                src={cutoutUrl(job.id, p.frameIdx, p.elementId)}
+                alt={`preview ${p.elementId}`}
+                className="block"
+                style={{
+                  maxHeight: "85vh",
+                  maxWidth: "70vw",
+                  width: "auto",
+                  height: "auto",
+                  objectFit: "contain",
+                }}
+              />
+              <div className="flex items-center justify-between px-4 py-2.5 bg-black/80 backdrop-blur-md">
+                <span className="text-white text-[13px] font-medium">{p.name}</span>
+                <span className="text-white/60 text-[11.5px] font-mono">来自分镜 {p.frameIdx + 1} · 点击进入分镜头编排</span>
+              </div>
+            </div>
+          </div>,
+          document.body,
+        )
+      })()}
     </div>
   )
 }