diff --git a/run.py b/run.py
index 93dee37..08b5ed3 100755
--- a/run.py
+++ b/run.py
@@ -45,6 +45,7 @@ class Language(Enum):
     - Kotlin: kt
     - Lua: lua
     """
+
     PYTHON = "py"
     C = "c"
     CPP = "cpp"
@@ -107,11 +108,11 @@ class Language(Enum):
             Language.KOTLIN: "kt.jar",
             Language.LUA: "lua.luac",
         }[self]
-    
+
     @property
     def executable_command(self):
         """
-        각 언어에 대한 실행 명령어. 
+        각 언어에 대한 실행 명령어.
         """
         return {
             Language.PYTHON: ["python", f"{BUILD_DIR}/{self.build_executable}"],
@@ -173,6 +174,7 @@ def natural_sort_key(s: str):
     """Natural sort key: splits string into text/number chunks for proper ordering."""
     return [int(c) if c.isdigit() else c.lower() for c in re.split(r"(\d+)", s)]
 
+
 def parse_range_string(range_str: str) -> list[int]:
     """
     범위 문자열을 정수 리스트로 변환.
@@ -334,7 +336,9 @@ def _guess_image_mime(src_url: str, content_type: str | None) -> str:
     return ext_to_mime.get(ext, "image/png")
 
 
-def _download_image_for_offline(problem_id: str, src_url: str, seq: int, force: bool) -> str | None:
+def _download_image_for_offline(
+    problem_id: str, src_url: str, seq: int, force: bool
+) -> str | None:
     req = urllib.request.Request(
         src_url,
         headers={
@@ -387,7 +391,9 @@ def _localize_images_in_html(problem_id: str, html_fragment: str, force: bool) -
             return f"{prefix}{quote}{local_src}{quote}"
 
         counter["i"] += 1
-        local_src = _download_image_for_offline(problem_id, abs_url, counter["i"], force=force)
+        local_src = _download_image_for_offline(
+            problem_id, abs_url, counter["i"], force=force
+        )
         if not local_src:
             return m.group(0)
 
@@ -455,7 +461,9 @@ def _render_math_expressions(html_fragment: str) -> str:
             return m.group(0)
 
     temp = re.sub(r"\$\$(.+?)\$\$", repl_block, temp, flags=re.DOTALL)
-    temp = re.sub(r"(?<!\$)\$(?!\$)(.+?)(?<!\$)\$(?!\$)", repl_inline, temp, flags=re.DOTALL)
+    temp = re.sub(
+        r"(?<!\$)\$(?!\$)(.+?)(?<!\$)\$(?!\$)", repl_inline, temp, flags=re.DOTALL
+    )
 
     for i, block in enumerate(protected_blocks):
         temp = temp.replace(f"@@PROTECTED_{i}@@", block)
@@ -495,7 +503,7 @@ def make_offline_problem_html(problem_id: str, raw_html: str, force: bool) -> st
         blocks.append(
             "\n".join(
                 [
-                    "<article class=\"section\">",
+                    '<article class="section">',
                     f"<h2>{fallback_label}</h2>",
                     f"{localized_content}",
                     "</article>",
@@ -503,7 +511,10 @@ def make_offline_problem_html(problem_id: str, raw_html: str, force: bool) -> st
             )
         )
 
-    for sample_type, sample_label in (("sampleinput", "예제 입력"), ("sampleoutput", "예제 출력")):
+    for sample_type, sample_label in (
+        ("sampleinput", "예제 입력"),
+        ("sampleoutput", "예제 출력"),
+    ):
         sample_pattern = rf"<section[^>]*id=\"{sample_type}(\d+)\"[^>]*>(.*?)</section>"
         sample_matches = list(
             re.finditer(sample_pattern, raw_html, flags=re.DOTALL | re.IGNORECASE)
@@ -540,7 +551,7 @@ def make_offline_problem_html(problem_id: str, raw_html: str, force: bool) -> st
             blocks.append(
                 "\n".join(
                     [
-                        "<article class=\"section\">",
+                        '<article class="section">',
                         f"<h2>{h2}</h2>",
                         pre_html,
                         "</article>",
@@ -550,7 +561,7 @@ def make_offline_problem_html(problem_id: str, raw_html: str, force: bool) -> st
 
     if not blocks:
         body_fallback = (
-            "<article class=\"section\">"
+            '<article class="section">'
             "<h2>원본 페이지</h2>"
             "<p>문제 본문 파싱에 실패하여 원본 HTML을 포함합니다.</p>"
             f"<pre>{escape(raw_html[:100000])}</pre>"
@@ -979,11 +990,15 @@ def export(from_: str, completed: bool, copy: bool):
     if completed:
         s_is_completed = True
 
-    dest_path: str = f"{STORAGE_DIR}/{s_loc}/{from_language.value}{'/completed' if s_is_completed else ''}/{s_file}.{from_language.value}"
+    dest_path: str = (
+        f"{STORAGE_DIR}/{s_loc}/{from_language.value}{'/completed' if s_is_completed else ''}/{s_file}.{from_language.value}"
+    )
     source_path: str = (
         f"{SRC_SPACE_DIR}/src-{from_language.value}/src/main.{from_language.value}"
     )
 
+    os.makedirs(os.path.dirname(dest_path), exist_ok=True)
+
     with open(source_path, "rb") as f_src, open(dest_path, "wb") as f_dst:
         f_dst.write(f_src.read())
 
@@ -1367,7 +1382,6 @@ def fetchprob(target: str, force: bool):
     )
 
 
-
 cli.add_command(run)
 cli.add_command(load)
 cli.add_command(init)