diff --git a/src/modules/lesson-preparation/components/paper-editor/inline-node.tsx b/src/modules/lesson-preparation/components/paper-editor/inline-node.tsx
new file mode 100644
index 0000000..b9e5fb6
--- /dev/null
+++ b/src/modules/lesson-preparation/components/paper-editor/inline-node.tsx
@@ -0,0 +1,108 @@
+"use client";
+
+import { useTranslations } from "next-intl";
+import type { Block, LessonPlanNode } from "../../types";
+import { InlineQaDialog } from "./inline-qa-dialog";
+import { useLessonPlanEditor } from "../../hooks/use-lesson-plan-editor";
+
+interface Props {
+  node: LessonPlanNode;
+}
+
+/**
+ * V4 inline-node：展开到正文流的节点渲染。
+ * 用 Inter 字体 + 左侧细线区分正文（Fraunces）。
+ */
+export function InlineNode({ node }: Props) {
+  const t = useTranslations("lessonPreparation");
+  const toggleExpand = useLessonPlanEditor((s) => s.toggleExpand);
+
+  // 师生交互节点用专门的对话体渲染
+  if (node.type === "interaction") {
+    return <InlineQaDialog node={node} />;
+  }
+
+  // 其他节点类型：用 InlineNodeBody 渲染只读摘要
+  // 完整编辑在右栏详情面板
+  const dotColorVar = `var(--lp-dot-${node.type})`;
+
+  return (
+    <div className="lp-inline-node">
+      <div className="lp-inline-node-head">
+        <span
+          style={{
+            width: 5,
+            height: 5,
+            borderRadius: "50%",
+            background: dotColorVar,
+            display: "inline-block",
+          }}
+        />
+        <span>{node.type}</span>
+        <span style={{ marginLeft: "auto", fontFamily: "JetBrains Mono, monospace", fontSize: 9, color: "var(--lp-inline-node-meta)" }}>
+          {node.id.slice(-4)}
+        </span>
+        <button
+          type="button"
+          onClick={() => toggleExpand(node.id)}
+          className="lp-collapse-btn"
+          style={{
+            cursor: "pointer",
+            padding: "2px 6px",
+            borderRadius: 3,
+            color: "var(--lp-inline-node-meta)",
+            fontSize: 11,
+            background: "transparent",
+            border: "none",
+          }}
+        >
+          {t("v4.contextMenu.collapseFromPaper")} ▴
+        </button>
+      </div>
+      <h4 className="lp-inline-node-title">{node.title}</h4>
+      <div className="lp-inline-node-body">
+        {/* 简化：各 block 类型的 inline 渲染在 InlineNodeBody 中处理 readonly 模式 */}
+        <InlineNodeBody node={node} />
+      </div>
+    </div>
+  );
+}
+
+/**
+ * 各节点类型的 inline 只读渲染。
+ * 这里给出最常见的几种的简化摘要，完整编辑在右栏详情面板。
+ */
+function InlineNodeBody({ node }: { node: Block }) {
+  const data = node.data;
+  // 按类型渲染摘要
+  switch (node.type) {
+    case "objective": {
+      const d = data as { objectives: { dimension: string; text: string }[] };
+      if (!d.objectives?.length) return <p style={{ color: "var(--muted-foreground)" }}>—</p>;
+      return (
+        <ul style={{ margin: "4px 0", paddingLeft: 16 }}>
+          {d.objectives.map((o, i) => (
+            <li key={i} style={{ marginBottom: 3, fontSize: 13 }}>{o.text}</li>
+          ))}
+        </ul>
+      );
+    }
+    case "summary": {
+      const d = data as { summaryPoints: string[] };
+      if (!d.summaryPoints?.length) return <p style={{ color: "var(--muted-foreground)" }}>—</p>;
+      return (
+        <ul style={{ margin: "4px 0", paddingLeft: 16 }}>
+          {d.summaryPoints.map((s, i) => (
+            <li key={i} style={{ marginBottom: 3, fontSize: 13 }}>{s}</li>
+          ))}
+        </ul>
+      );
+    }
+    case "exercise": {
+      const d = data as { items: unknown[] };
+      return <p style={{ fontSize: 13 }}>{d.items?.length ?? 0} 道练习</p>;
+    }
+    default:
+      return <p style={{ fontSize: 13, color: "var(--muted-foreground)" }}>{node.title}</p>;
+  }
+}