diff --git a/.memory/worklog.json b/.memory/worklog.json
index 6d79137..264ff27 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -286,6 +286,13 @@
       "message": "auto-save 2026-05-12 19:53 (~2)",
       "hash": "c481da4",
       "files_changed": 2
+    },
+    {
+      "ts": "2026-05-12T19:59:15+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-12 19:58 (+1, ~4)",
+      "hash": "375494e",
+      "files_changed": 5
     }
   ]
 }
diff --git a/web/components/lightbox.tsx b/web/components/lightbox.tsx
index d86ae62..a253cf4 100644
--- a/web/components/lightbox.tsx
+++ b/web/components/lightbox.tsx
@@ -1,7 +1,7 @@
 "use client"
 import { useEffect } from "react"
 import { X, ChevronLeft, ChevronRight, Check } from "lucide-react"
-import { frameUrl, videoUrl, type KeyFrame } from "@/lib/api"
+import { frameUrl, type KeyFrame } from "@/lib/api"
 
 interface Props {
   jobId: string
@@ -65,19 +65,12 @@ export function FrameLightbox({ jobId, frames, activeIndex, selected, onClose, o
         </button>
       )}
 
-      {/* 大视频 — 可拖时间轴播放（默认 seek 到该帧时间点） */}
+      {/* 大图 — 关键帧是静态素材（传给生图节点垫图用），不播放视频 */}
       <div onClick={(e) => e.stopPropagation()} className="flex flex-col items-center gap-4 max-w-[92vw] max-h-[92vh]">
-        <video
-          key={`${jobId}-${f.index}`}
-          src={videoUrl(jobId)}
-          controls
-          autoPlay
-          playsInline
-          preload="auto"
-          className="max-w-[88vw] max-h-[72vh] rounded-xl shadow-2xl bg-black"
-          onLoadedMetadata={(e) => {
-            (e.target as HTMLVideoElement).currentTime = f.timestamp
-          }}
+        <img
+          src={frameUrl(jobId, f.index)}
+          alt={`frame ${f.index}`}
+          className="max-w-[88vw] max-h-[72vh] rounded-xl shadow-2xl object-contain"
         />
         <div className="flex items-center gap-4 text-white">
           <div className="font-mono text-sm tabular-nums">
diff --git a/web/components/nodes/index.tsx b/web/components/nodes/index.tsx
index aa387c0..f2bf7a2 100644
--- a/web/components/nodes/index.tsx
+++ b/web/components/nodes/index.tsx
@@ -64,6 +64,7 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
   const [url, setUrl] = useState("")
   const [videoT, setVideoT] = useState(0)
   const [addingFrame, setAddingFrame] = useState(false)
+  const [videoExpanded, setVideoExpanded] = useState(false)
   const fileRef = useRef<HTMLInputElement>(null)
   const videoRef = useRef<HTMLVideoElement>(null)
   const job = d.job
@@ -78,15 +79,15 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
 
   return (
     <div className="relative" style={{ width: 320 }}>
-      {/* 视频缩略图浮于节点上方 — hover 自动播放，点击进大 lightbox */}
-      {hasVideo && job && (
+      {/* 视频缩略图浮于节点上方 — 跟关键帧缩略图同尺寸（小），点击稍微放大可选帧 */}
+      {hasVideo && job && !videoExpanded && (
         <div className="absolute left-0 right-0 flex justify-center" style={{ bottom: "calc(100% + 12px)" }}>
           <button
             type="button"
-            onClick={(e) => { e.stopPropagation(); d.onOpenVideoLightbox() }}
-            title="点击放大滑动播放"
-            className="group relative rounded-lg overflow-hidden border border-white/25 shadow-2xl hover:-translate-y-0.5 transition"
-            style={{ width: 220 }}
+            onClick={(e) => { e.stopPropagation(); setVideoExpanded(true) }}
+            title="点击展开 · 可拖时间轴选帧"
+            className="group relative rounded-md overflow-hidden border border-white/30 shadow-lg hover:-translate-y-0.5 transition"
+            style={{ width: 80 }}
           >
             <video
               src={videoUrl(job.id)}
@@ -95,7 +96,7 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
               playsInline
               preload="metadata"
               className="block w-full bg-black"
-              style={{ aspectRatio: `${job.width}/${job.height}`, maxHeight: 280 }}
+              style={{ aspectRatio: `${job.width}/${job.height}` }}
               onMouseEnter={(e) => {
                 const v = e.target as HTMLVideoElement
                 v.play().catch(() => {})
@@ -106,16 +107,62 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
                 v.currentTime = 0
               }}
             />
-            <div className="absolute bottom-1.5 right-1.5 bg-black/70 text-white text-[10px] font-mono px-1.5 py-0.5 rounded">
+            <div className="absolute bottom-0.5 right-0.5 bg-black/70 text-white text-[9px] font-mono px-1 py-0.5 rounded">
               {job.duration.toFixed(1)}s
             </div>
-            <div className="pointer-events-none absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 bg-black/30 transition">
-              <span className="text-white text-[11px] bg-black/70 px-2 py-1 rounded">点击放大</span>
-            </div>
           </button>
         </div>
       )}
 
+      {/* 展开态 — 稍微放大（360 宽），含 controls + 加帧按钮，不全屏 */}
+      {hasVideo && job && videoExpanded && (
+        <div
+          className="absolute left-0 right-0 flex justify-center"
+          style={{ bottom: "calc(100% + 12px)" }}
+        >
+          <div
+            onClick={(e) => e.stopPropagation()}
+            className="relative rounded-xl overflow-hidden border border-white/25 shadow-2xl bg-black"
+            style={{ width: 360, animation: "drawer-in 0.18s cubic-bezier(0.32, 0.72, 0, 1)" }}
+          >
+            <video
+              ref={videoRef}
+              src={videoUrl(job.id)}
+              controls
+              autoPlay
+              playsInline
+              preload="auto"
+              onTimeUpdate={(e) => setVideoT((e.target as HTMLVideoElement).currentTime)}
+              className="block w-full bg-black"
+              style={{ aspectRatio: `${job.width}/${job.height}`, maxHeight: "60vh" }}
+            />
+            <div className="flex items-center justify-between px-3 py-2 bg-black/70 backdrop-blur-md gap-2">
+              <button
+                type="button"
+                disabled={addingFrame}
+                onClick={async (e) => {
+                  e.stopPropagation()
+                  const t = videoRef.current?.currentTime ?? videoT
+                  setAddingFrame(true)
+                  try { await d.onAddManualFrame(t) } finally { setAddingFrame(false) }
+                }}
+                className="flex-1 text-[11.5px] py-1.5 rounded-md bg-emerald-500 hover:bg-emerald-400 text-white disabled:opacity-50 inline-flex items-center justify-center gap-1.5 font-medium"
+              >
+                {addingFrame ? <Loader2 className="h-3 w-3 animate-spin" /> : <Plus className="h-3 w-3" />}
+                + 把 {videoT.toFixed(1)}s 加为关键帧
+              </button>
+              <button
+                type="button"
+                onClick={(e) => { e.stopPropagation(); setVideoExpanded(false) }}
+                className="px-2.5 py-1.5 text-[11px] rounded-md bg-white/10 hover:bg-white/20 text-white"
+              >
+                收起
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
+
     <NodeShell
       type="input" status={inputStatus(job)}
       icon={<Link2 className="h-4 w-4" />}
@@ -300,7 +347,7 @@ export function KeyframeNode({ data, selected }: any) {
                   {f.timestamp.toFixed(1)}s
                 </div>
 
-                {/* Hover 视频片段预览 — 从该时间点静音 loop 播放 */}
+                {/* Hover 静态大图预览（关键帧是给下游生图垫图的素材，不需要视频） */}
                 <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={{
@@ -311,13 +358,9 @@ export function KeyframeNode({ data, selected }: any) {
                   }}
                 >
                   <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)" }}>
-                    <video
-                      src={`${process.env.NEXT_PUBLIC_API_BASE ?? "http://localhost:4291"}/jobs/${jobId}/video.mp4#t=${f.timestamp}`}
-                      muted
-                      loop
-                      autoPlay
-                      playsInline
-                      preload="metadata"
+                    <img
+                      src={frameUrl(jobId, f.index)}
+                      alt={`preview ${f.index}`}
                       className="block"
                       style={{
                         width: KEYFRAME_WIDTH * 2,
@@ -326,15 +369,10 @@ export function KeyframeNode({ data, selected }: any) {
                         maxHeight: "82vh",
                         objectFit: "contain",
                       }}
-                      onLoadedMetadata={(e) => {
-                        const v = e.target as HTMLVideoElement
-                        v.currentTime = f.timestamp
-                        v.play().catch(() => {})
-                      }}
                     />
                     <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} · 自动播放</span>
-                      <span className="text-white/60 text-[11px] font-mono">从 {f.timestamp.toFixed(2)}s</span>
+                      <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>