diff --git a/.memory/worklog.json b/.memory/worklog.json
index 2baf947..51f517f 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -76,6 +76,13 @@
       "message": "auto-save 2026-05-12 16:33 (~1)",
       "hash": "37bf7c9",
       "files_changed": 1
+    },
+    {
+      "ts": "2026-05-12T16:39:03+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-12 16:38 (~1)",
+      "hash": "1b95cb2",
+      "files_changed": 1
     }
   ]
 }
diff --git a/web/app/globals.css b/web/app/globals.css
index 39022c9..bf0d29c 100644
--- a/web/app/globals.css
+++ b/web/app/globals.css
@@ -9,6 +9,7 @@
    ============================================================ */
 
 :root {
+  color-scheme: light;
   /* ---- Light · 暖白底 ---- */
   --bg-canvas-1: #f6f4ed;
   --bg-canvas-2: #ece6d8;
@@ -59,6 +60,7 @@
 }
 
 .dark {
+  color-scheme: dark;
   /* ---- Dark · 深蓝紫 ---- */
   --bg-canvas-1: #0a0d1c;
   --bg-canvas-2: #14172e;
diff --git a/web/app/page.tsx b/web/app/page.tsx
index 303fdc1..3945b3f 100644
--- a/web/app/page.tsx
+++ b/web/app/page.tsx
@@ -2,6 +2,7 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from "react"
 import {
   ReactFlow, Background, BackgroundVariant, Controls, MiniMap,
+  useNodesState, useEdgesState,
   type Node, type Edge,
 } from "@xyflow/react"
 import { Toaster, toast } from "sonner"
@@ -137,19 +138,29 @@ export default function Home() {
     onToggleFrame: handleToggleFrame,
   }), [job, submitting, selectedFrames, handleSubmit, handleUpload, handleToggleFrame])
 
-  const nodes: Node[] = useMemo(
-    () => LAYOUT.map((n) => ({
+  // 用 useNodesState 让 ReactFlow 自己管位置（避免轮询时重置 drag）
+  const [nodes, setNodes, onNodesChange] = useNodesState<Node>(
+    LAYOUT.map((n) => ({
       id: n.id,
       type: n.type,
       position: { x: n.x, y: n.y },
       data: nodeData,
       draggable: true,
     })),
-    [nodeData],
+  )
+  const [edges, setEdges, onEdgesChange] = useEdgesState<Edge>(
+    EDGES_RAW.map(([from, to], i) => ({
+      id: `e${i}`, source: from, target: to, animated: false, type: "default",
+    })),
   )
 
-  // 边状态：source 节点 done 时 animated
-  const edges: Edge[] = useMemo(() => {
+  // Job 数据变化时只更新节点 data 不动 position
+  useEffect(() => {
+    setNodes((prev) => prev.map((n) => ({ ...n, data: nodeData })))
+  }, [nodeData, setNodes])
+
+  // 边的 animated 状态跟 Job 进度联动
+  useEffect(() => {
     const doneOf: Record<string, boolean> = {
       input: !!job,
       download: !!job?.video_url,
@@ -158,14 +169,8 @@ export default function Home() {
       asr: !!job && job.transcript.length > 0,
       translate: !!job && (job.transcript.some((s) => s.zh) ?? false),
     }
-    return EDGES_RAW.map(([from, to], i) => ({
-      id: `e${i}`,
-      source: from,
-      target: to,
-      animated: !!doneOf[from],
-      type: "default",
-    }))
-  }, [job])
+    setEdges((prev) => prev.map((e) => ({ ...e, animated: !!doneOf[e.source] })))
+  }, [job, setEdges])
 
   return (
     <>
@@ -197,6 +202,8 @@ export default function Home() {
         <ReactFlow
           nodes={nodes}
           edges={edges}
+          onNodesChange={onNodesChange}
+          onEdgesChange={onEdgesChange}
           nodeTypes={NODE_TYPES}
           fitView
           fitViewOptions={{ padding: 0.12 }}
diff --git a/web/components/nodes/index.tsx b/web/components/nodes/index.tsx
index af24c06..0e3a638 100644
--- a/web/components/nodes/index.tsx
+++ b/web/components/nodes/index.tsx
@@ -74,7 +74,7 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
         onChange={(e) => setUrl(e.target.value)}
         placeholder="粘贴 TikTok 链接"
         disabled={isLocked}
-        className="w-full text-[12px] px-2.5 py-2 rounded-md bg-white/40 dark:bg-white/[0.04] border border-black/10 dark:border-white/10 outline-none placeholder:text-[var(--text-faint)] focus:ring-2 focus:ring-[var(--ring)] disabled:opacity-40"
+        className="w-full text-[12px] px-2.5 py-2 rounded-md bg-white/60 dark:bg-black/40 border border-black/10 dark:border-white/10 outline-none text-[var(--text-strong)] placeholder:text-[var(--text-faint)] focus:ring-2 focus:ring-[var(--ring)] disabled:opacity-40"
       />
       <div className="mt-2 flex gap-1.5">
         <button