diff --git a/src/app/globals.css b/src/app/globals.css
index 61871a0..bfa110f 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -190,6 +190,33 @@
 .prose :where(ul ul) {
   list-style-type: circle;
 }
+/* Код-блоки урока (с кнопкой копирования) */
+.prose pre {
+  background: var(--color-surface, #f3f3ee);
+  border: 1.5px solid var(--border);
+  padding: 2.5rem 1rem 1rem; /* верхний отступ — под кнопку «Копировать» */
+  margin: 0;
+  overflow-x: auto;
+  font-family: var(--font-mono);
+  font-size: 0.85em;
+  line-height: 1.55;
+}
+.prose pre code {
+  background: none;
+  border: none;
+  padding: 0;
+  font-family: inherit;
+  font-size: inherit;
+  white-space: pre;
+}
+/* Инлайновый код */
+.prose :not(pre) > code {
+  background: var(--color-surface, #f3f3ee);
+  border: 1px solid var(--border);
+  padding: 0.1em 0.35em;
+  font-family: var(--font-mono);
+  font-size: 0.9em;
+}
 
 /* Admin sidebar (dark) */
 .admin-sidebar {
diff --git a/src/components/student/lesson-content.tsx b/src/components/student/lesson-content.tsx
index ef91613..82faa5e 100644
--- a/src/components/student/lesson-content.tsx
+++ b/src/components/student/lesson-content.tsx
@@ -1,13 +1,61 @@
 "use client";
 
-import { useEditor, EditorContent, NodeViewWrapper, ReactNodeViewRenderer } from "@tiptap/react";
+import { useState } from "react";
+import { useEditor, EditorContent, NodeViewWrapper, NodeViewContent, ReactNodeViewRenderer } from "@tiptap/react";
 import { Node, mergeAttributes } from "@tiptap/core";
 import StarterKit from "@tiptap/starter-kit";
+import CodeBlock from "@tiptap/extension-code-block";
 import Image from "@tiptap/extension-image";
 import Link from "@tiptap/extension-link";
 import Underline from "@tiptap/extension-underline";
+import { Copy, Check } from "lucide-react";
 import { KinescopePlayer } from "@/components/player/kinescope-player";
 
+function CodeBlockStudentView({ node }: { node: { textContent: string } }) {
+  const [copied, setCopied] = useState(false);
+
+  const handleCopy = async () => {
+    try {
+      await navigator.clipboard.writeText(node.textContent);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 1500);
+    } catch {
+      // clipboard недоступен (нет https / нет прав) — тихо игнорируем
+    }
+  };
+
+  return (
+    <NodeViewWrapper className="relative group my-4">
+      <button
+        type="button"
+        onClick={handleCopy}
+        contentEditable={false}
+        aria-label="Скопировать код"
+        className="absolute top-2 right-2 z-10 flex items-center gap-1 px-2 py-1 text-xs select-none transition-opacity"
+        style={{
+          border: "1.5px solid var(--border)",
+          background: "var(--background)",
+          color: copied ? "var(--foreground)" : "var(--muted-foreground)",
+          fontFamily: "var(--font-mono, monospace)",
+        }}
+      >
+        {copied ? <Check size={13} strokeWidth={3} /> : <Copy size={13} />}
+        {copied ? "Скопировано" : "Копировать"}
+      </button>
+      <pre>
+        <NodeViewContent<"code"> as="code" />
+      </pre>
+    </NodeViewWrapper>
+  );
+}
+
+const CodeBlockWithCopy = CodeBlock.extend({
+  addNodeView() {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return ReactNodeViewRenderer(CodeBlockStudentView as any);
+  },
+});
+
 function KinescopeVideoStudentView({
   node,
   extension,
@@ -56,7 +104,8 @@ const KinescopeVideoExtension = Node.create<{ poster?: string }>({
 export function LessonContent({ content, coverImage }: { content: object; coverImage?: string | null }) {
   const editor = useEditor({
     extensions: [
-      StarterKit,
+      StarterKit.configure({ codeBlock: false }),
+      CodeBlockWithCopy,
       Underline,
       Image.configure({ inline: false }),
       Link.configure({ openOnClick: true }),
diff --git a/src/lib/actions/student-actions.ts b/src/lib/actions/student-actions.ts
index 53594cc..7f7d109 100644
--- a/src/lib/actions/student-actions.ts
+++ b/src/lib/actions/student-actions.ts
@@ -96,7 +96,16 @@ export async function submitHomework(
     }
   }
 
+  // Отметить урок пройденным по факту сдачи ДЗ (идемпотентно)
+  await prisma.lessonProgress.upsert({
+    where: { userId_lessonId: { userId: session.user.id, lessonId } },
+    create: { userId: session.user.id, lessonId },
+    update: {},
+  });
+
   revalidatePath(`/courses/${slug}/lessons/${lessonId}`);
+  revalidatePath(`/courses/${slug}`);
+  revalidatePath("/dashboard");
 }
 
 // ── Quiz ──────────────────────────────────────────────────────────────────────