diff --git a/CLAUDE.md b/CLAUDE.md
index 34e41e81..8e7c34ef 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -42,11 +42,11 @@ mineru 模块内部子模块之间的引用统一使用 **relative import**，
 ```python
 # 正确 — relative import
 from .base import DocumentParser
-from ..utils.enum_class import MakeMode
+from ..render import RenderMode
 
 # 错误 — 项目内不允许 absolute import 引用自身模块
 from mineru.api.base import DocumentParser
-from mineru.utils.enum_class import MakeMode
+from mineru.render import RenderMode
 ```
 
 只引用外部第三方库时使用 absolute import（如 `from loguru import logger`）。
@@ -199,7 +199,14 @@ pr-5415 重构后，Middle JSON 已收敛为 schema 2.0 的统一结构，不再
 - `RenderFormat.DOCX` → `render_docx`
 - `RenderFormat.STRUCTURED_CONTENT` → `render_structured_content`
 
-`render/_internal/` 下按目标格式分目录组织共享逻辑（`common/`/`markdown/`/`html/`/`docx/`）。不再有 `pipeline_union_make`/`vlm_union_make`/`office_union_make` 三套逻辑，`content_list` 格式和 `render_content_list` 函数已删除。
+`render/_internal/` 下按目标格式分目录组织共享逻辑（`common/`/`markdown/`/`html/`/`docx/`/`structured_content/`），顶层同名模块只是惰性公共门面。行内语义解析归 `backend/postprocess/inline.py`，renderer 只能单向依赖该模块和 `backend/postprocess/table_merge`。不再有 `pipeline_union_make`/`vlm_union_make`/`office_union_make` 三套逻辑，`content_list` 格式和 `render_content_list` 函数已删除。
+
+### 5.1 目录职责
+
+- `model/runtime/` 负责设备、显存、ONNX 与 Hybrid 本地模型生命周期；模型仓库和下载分别位于 `model/registry.py`、`model/download.py`。
+- `model/flash/pdf/` 负责 PDFDocument、PDFium、原生文本、样式和表格恢复；`model/flash/office/` 负责六类 Office 格式。
+- `utils/` 只保留 geometry、image、image payload、language/text、platform 和 stdio 等叶子能力；活动代码不得把业务实现重新放入 utils。
+- 稳定依赖方向为 `utils/types → model → backend → render → parser/kit/doclib`，禁止反向引用。
 
 ### 6. ParseResult 与 MiddleJson 的关系
 
diff --git a/tests/fixtures/evaluate_native_pdf_table_manifest.py b/tests/fixtures/evaluate_native_pdf_table_manifest.py
index 58183582..e2964bbd 100644
--- a/tests/fixtures/evaluate_native_pdf_table_manifest.py
+++ b/tests/fixtures/evaluate_native_pdf_table_manifest.py
@@ -12,14 +12,14 @@ from collections import defaultdict
 from pathlib import Path, PureWindowsPath
 from typing import Any
 
-from mineru.utils.native_pdf_table import (
+from mineru.model.flash.pdf.table_recovery import (
     NativeTableInput,
     coerce_native_table_rectangles,
     coerce_native_table_rules,
     recover_native_pdf_table,
 )
-from mineru.utils.native_pdf_table.engine import diagnose_native_pdf_table
-from mineru.utils.pdf_document import PDFDocument
+from mineru.model.flash.pdf.table_recovery.engine import diagnose_native_pdf_table
+from mineru.model.flash.pdf.document import PDFDocument
 
 _DEFAULT_SOURCE_ROOT = Path(__file__).resolve().parents[1] / "unittest" / "pdfs" / "native_pdf_tables"
 
diff --git a/tests/unittest/_flash_pdf_test_utils.py b/tests/unittest/_flash_pdf_test_utils.py
index a1201bee..14258197 100644
--- a/tests/unittest/_flash_pdf_test_utils.py
+++ b/tests/unittest/_flash_pdf_test_utils.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     models,
 )
 
diff --git a/tests/unittest/test_backend_architecture.py b/tests/unittest/test_backend_architecture.py
index f8f25443..be3fa471 100644
--- a/tests/unittest/test_backend_architecture.py
+++ b/tests/unittest/test_backend_architecture.py
@@ -1,38 +1,107 @@
 from __future__ import annotations
 
 import ast
+import importlib.util
 from pathlib import Path
+import subprocess
+import sys
 
 from mineru.backend.postprocess import table_merge
 
 _PROJECT_ROOT = Path(__file__).resolve().parents[2]
 _COPYRIGHT_HEADER = "# Copyright (c) Opendatalab. All rights reserved."
-_CHINESE_DOCSTRING_EXTRA_PATHS = (
-    "mineru/model/flash/office",
-    "mineru/model/flash/xycut.py",
-    "mineru/model/model_types.py",
-    "mineru/utils/native_pdf_table",
-    "mineru/utils/spatial_text.py",
-    "mineru/utils/text_utils.py",
+_SOURCE_ROOTS = (
+    _PROJECT_ROOT / "mineru/backend",
+    _PROJECT_ROOT / "mineru/model",
+    _PROJECT_ROOT / "mineru/render",
+    _PROJECT_ROOT / "mineru/utils",
+    _PROJECT_ROOT / "mineru/parser",
+)
+_HEADER_PATHS = (
+    _PROJECT_ROOT / "mineru/backend",
+    _PROJECT_ROOT / "mineru/model/flash",
+    _PROJECT_ROOT / "mineru/model/runtime",
+    _PROJECT_ROOT / "mineru/model/registry.py",
+    _PROJECT_ROOT / "mineru/model/download.py",
+    _PROJECT_ROOT / "mineru/model/ocr/geometry.py",
+    _PROJECT_ROOT / "mineru/model/ocr/image.py",
+    _PROJECT_ROOT / "mineru/model/ocr/language.py",
+    _PROJECT_ROOT / "mineru/model/ocr/results.py",
+    _PROJECT_ROOT / "mineru/render",
+    _PROJECT_ROOT / "mineru/utils",
+    _PROJECT_ROOT / "mineru/parser/file_type.py",
+    _PROJECT_ROOT / "mineru/parser/page_range.py",
+    _PROJECT_ROOT / "mineru/parser/process_control.py",
+    _PROJECT_ROOT / "mineru/parser/writer.py",
+)
+_CHINESE_DOCSTRING_PATHS = (
+    _PROJECT_ROOT / "mineru/backend",
+    _PROJECT_ROOT / "mineru/model/runtime/device.py",
+    _PROJECT_ROOT / "mineru/model/runtime/memory.py",
+    _PROJECT_ROOT / "mineru/model/ocr/geometry.py",
+    _PROJECT_ROOT / "mineru/model/ocr/image.py",
+    _PROJECT_ROOT / "mineru/model/ocr/results.py",
+    _PROJECT_ROOT / "mineru/render/markdown.py",
+    _PROJECT_ROOT / "mineru/render/html.py",
+    _PROJECT_ROOT / "mineru/render/docx.py",
+    _PROJECT_ROOT / "mineru/render/structured_content.py",
+    _PROJECT_ROOT / "mineru/utils/image.py",
+)
+_REMOVED_INTERNAL_MODULES = (
+    "mineru.backend.local_model_runtime",
+    "mineru.model.model_types",
+    "mineru.model.flash.model",
+    "mineru.model.flash.native_pdf",
+    "mineru.model.utils",
+    "mineru.render.writer",
+    "mineru.render._internal.common.inline",
+    "mineru.utils.backend_options",
+    "mineru.utils.config_reader",
+    "mineru.utils.model_registry",
+    "mineru.utils.native_pdf_table",
+    "mineru.utils.ocr_utils",
+    "mineru.utils.pdf_document",
 )
 
 
-def _absolute_imports(path: Path) -> set[str]:
-    """读取 Python 文件中的绝对 import 模块名。"""
+def _module_name(path: Path) -> str:
+    """把项目内 Python 路径转换为完整模块名。"""
+    relative = path.relative_to(_PROJECT_ROOT).with_suffix("")
+    parts = list(relative.parts)
+    if parts[-1] == "__init__":
+        parts.pop()
+    return ".".join(parts)
+
+
+def _resolved_imports(path: Path) -> set[str]:
+    """把绝对和相对 import 都解析为完整模块名。"""
     tree = ast.parse(path.read_text(encoding="utf-8"))
+    module_name = _module_name(path)
+    package_parts = module_name.split(".") if path.name == "__init__.py" else module_name.split(".")[:-1]
     imports: set[str] = set()
     for node in ast.walk(tree):
         if isinstance(node, ast.Import):
             imports.update(alias.name for alias in node.names)
-        elif isinstance(node, ast.ImportFrom) and node.level == 0 and node.module:
-            imports.add(node.module)
+            continue
+        if not isinstance(node, ast.ImportFrom):
+            continue
+        if node.level == 0:
+            if node.module:
+                imports.add(node.module)
+            continue
+        resolved_parts = package_parts[:]
+        if node.level > 1:
+            resolved_parts = resolved_parts[: -(node.level - 1)]
+        if node.module:
+            resolved_parts.extend(node.module.split("."))
+        imports.add(".".join(resolved_parts))
     return imports
 
 
 def _relative_imports(path: Path) -> set[str]:
     """读取 Python 文件对同包模块的相对 import 名称。"""
     tree = ast.parse(path.read_text(encoding="utf-8"))
-    return {node.module for node in ast.walk(tree) if isinstance(node, ast.ImportFrom) and node.level > 0 and node.module}
+    return {node.module for node in ast.walk(tree) if isinstance(node, ast.ImportFrom) and node.level == 1 and node.module}
 
 
 def _contains_chinese(text: str) -> bool:
@@ -40,83 +109,163 @@ def _contains_chinese(text: str) -> bool:
     return any("\u4e00" <= char <= "\u9fff" for char in text)
 
 
-def _iter_refactored_python_paths() -> list[Path]:
-    """收集 backend 及本次从 utils 迁出的公共 Python 模块。"""
-    paths = list((_PROJECT_ROOT / "mineru/backend").rglob("*.py"))
-    for relative_path in _CHINESE_DOCSTRING_EXTRA_PATHS:
-        path = _PROJECT_ROOT / relative_path
-        paths.extend(path.rglob("*.py") if path.is_dir() else [path])
-    return sorted(paths)
+def _iter_python_paths(path: Path) -> list[Path]:
+    """返回文件自身或目录下全部 Python 文件。"""
+    return sorted(path.rglob("*.py")) if path.is_dir() else [path]
 
 
-def test_backend_python_files_have_copyright_header() -> None:
-    """守卫 backend 下每个 Python 文件都以统一版权声明开头。"""
+def test_target_python_files_have_copyright_header() -> None:
+    """守卫本次目标目录中的一方 Python 文件使用统一版权头。"""
+    paths = [
+        path
+        for configured_path in _HEADER_PATHS
+        for path in _iter_python_paths(configured_path)
+        if "_internal/pytorchocr" not in path.as_posix() and path.name != "cli_parser.py"
+    ]
     offenders = [
-        str(path.relative_to(_PROJECT_ROOT))
-        for path in (_PROJECT_ROOT / "mineru/backend").rglob("*.py")
-        if path.read_text(encoding="utf-8").splitlines()[0] != _COPYRIGHT_HEADER
+        str(path.relative_to(_PROJECT_ROOT)) for path in paths if path.read_text().splitlines()[0] != _COPYRIGHT_HEADER
     ]
     assert not offenders
 
 
-def test_refactored_definitions_have_chinese_docstrings() -> None:
-    """守卫 backend 及迁出模块中的函数、方法和类均有中文职责说明。"""
+def test_new_first_party_definitions_have_chinese_docstrings() -> None:
+    """守卫本次新增的一方函数、方法和类都有中文职责说明。"""
     offenders: list[str] = []
-    for path in _iter_refactored_python_paths():
+    for configured_path in _CHINESE_DOCSTRING_PATHS:
+        for path in _iter_python_paths(configured_path):
+            tree = ast.parse(path.read_text(encoding="utf-8"))
+            for node in ast.walk(tree):
+                if not isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef, ast.ClassDef)):
+                    continue
+                docstring = ast.get_docstring(node)
+                if not docstring or not _contains_chinese(docstring):
+                    offenders.append(f"{path.relative_to(_PROJECT_ROOT)}:{node.lineno}:{node.name}")
+    assert not offenders
+
+
+def test_active_mineru_imports_use_relative_form() -> None:
+    """守卫活动生产代码的 MinerU 内部引用统一使用相对 import。"""
+    offenders: list[str] = []
+    for path in (_PROJECT_ROOT / "mineru").rglob("*.py"):
+        if "cli_old" in path.parts:
+            continue
         tree = ast.parse(path.read_text(encoding="utf-8"))
         for node in ast.walk(tree):
-            if not isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef, ast.ClassDef)):
-                continue
-            docstring = ast.get_docstring(node)
-            if not docstring or not _contains_chinese(docstring):
-                relative_path = path.relative_to(_PROJECT_ROOT)
-                offenders.append(f"{relative_path}:{node.lineno}:{node.name}")
+            if (
+                isinstance(node, ast.ImportFrom)
+                and node.level == 0
+                and (node.module == "mineru" or (node.module or "").startswith("mineru."))
+            ):
+                offenders.append(f"{path.relative_to(_PROJECT_ROOT)}:{node.lineno}:{node.module}")
+            elif isinstance(node, ast.Import):
+                for alias in node.names:
+                    if alias.name == "mineru" or alias.name.startswith("mineru."):
+                        offenders.append(f"{path.relative_to(_PROJECT_ROOT)}:{node.lineno}:{alias.name}")
     assert not offenders
 
 
-def test_model_and_types_do_not_import_backend() -> None:
-    """守卫模型层和公开类型层不再反向依赖 backend。"""
-    paths = [*_PROJECT_ROOT.glob("mineru/model/**/*.py"), _PROJECT_ROOT / "mineru/types.py"]
-    offenders = {
-        str(path.relative_to(_PROJECT_ROOT)): sorted(
-            module for module in _absolute_imports(path) if module.startswith("mineru.backend")
+def test_layer_dependencies_are_one_way() -> None:
+    """守卫 utils、model、backend 与 render 的单向依赖边界。"""
+    offenders: dict[str, list[str]] = {}
+    model_paths = [*_PROJECT_ROOT.glob("mineru/model/**/*.py"), _PROJECT_ROOT / "mineru/types.py"]
+    for path in model_paths:
+        invalid = sorted(module for module in _resolved_imports(path) if module.startswith(("mineru.backend", "mineru.render")))
+        if invalid:
+            offenders[str(path.relative_to(_PROJECT_ROOT))] = invalid
+    for path in _PROJECT_ROOT.glob("mineru/backend/**/*.py"):
+        invalid = sorted(module for module in _resolved_imports(path) if module.startswith("mineru.render"))
+        if invalid:
+            offenders[str(path.relative_to(_PROJECT_ROOT))] = invalid
+    for path in _PROJECT_ROOT.glob("mineru/utils/**/*.py"):
+        invalid = sorted(
+            module
+            for module in _resolved_imports(path)
+            if module.startswith(("mineru.backend", "mineru.model", "mineru.render", "mineru.parser"))
         )
-        for path in paths
-    }
-    assert not {path: modules for path, modules in offenders.items() if modules}
-
-
-def test_analysis_does_not_import_postprocess() -> None:
-    """守卫 model-list 生产层不反向调用 Middle JSON 后处理层。"""
-    offenders = {
-        str(path.relative_to(_PROJECT_ROOT)): sorted(
-            module for module in _absolute_imports(path) if module.startswith("mineru.backend.postprocess")
+        if invalid:
+            offenders[str(path.relative_to(_PROJECT_ROOT))] = invalid
+    for path in _PROJECT_ROOT.glob("mineru/backend/analysis/**/*.py"):
+        invalid = sorted(module for module in _resolved_imports(path) if module.startswith("mineru.backend.postprocess"))
+        if invalid:
+            offenders[str(path.relative_to(_PROJECT_ROOT))] = invalid
+    allowed_render_backend = (
+        "mineru.backend.postprocess.inline",
+        "mineru.backend.postprocess.table_merge",
+    )
+    for path in _PROJECT_ROOT.glob("mineru/render/**/*.py"):
+        invalid = sorted(
+            module
+            for module in _resolved_imports(path)
+            if module.startswith("mineru.backend")
+            and not any(module == allowed or module.startswith(f"{allowed}.") for allowed in allowed_render_backend)
         )
-        for path in _PROJECT_ROOT.glob("mineru/backend/analysis/**/*.py")
-    }
-    assert not {path: modules for path, modules in offenders.items() if modules}
+        if invalid:
+            offenders[str(path.relative_to(_PROJECT_ROOT))] = invalid
+    assert not offenders
 
 
-def test_backend_utils_package_is_removed() -> None:
-    """守卫 backend/utils 不再承载任何 Python 源码。"""
-    utils_path = _PROJECT_ROOT / "mineru/backend/utils"
-    assert not utils_path.exists()
-
-
-def test_llm_postprocess_business_logic_is_not_kept_in_utils() -> None:
-    """守卫 LLM 客户端和标题业务统一归属 backend/postprocess。"""
-    removed_utils_paths = [
-        _PROJECT_ROOT / "mineru/utils/llm_aided.py",
-        _PROJECT_ROOT / "mineru/utils/title_level_postprocess.py",
-    ]
-    expected_backend_paths = [
-        _PROJECT_ROOT / "mineru/backend/postprocess/llm_client.py",
-        _PROJECT_ROOT / "mineru/backend/postprocess/title_leveling.py",
-        _PROJECT_ROOT / "mineru/backend/postprocess/table_merge/llm_cell_merge.py",
+def test_package_initializers_define_explicit_all() -> None:
+    """守卫目标目录下每个包入口都显式声明 __all__。"""
+    offenders = [
+        str(path.relative_to(_PROJECT_ROOT))
+        for root in _SOURCE_ROOTS
+        for path in root.rglob("__init__.py")
+        if "__all__" not in path.read_text(encoding="utf-8")
     ]
+    assert not offenders
 
-    assert not [path for path in removed_utils_paths if path.exists()]
-    assert all(path.is_file() for path in expected_backend_paths)
+
+def test_removed_private_module_paths_have_no_active_references() -> None:
+    """守卫严格迁移后的活动生产代码不再引用旧私有路径。"""
+    offenders: list[str] = []
+    for path in (_PROJECT_ROOT / "mineru").rglob("*.py"):
+        if "cli_old" in path.parts:
+            continue
+        text = path.read_text(encoding="utf-8")
+        for module_name in _REMOVED_INTERNAL_MODULES:
+            if module_name in text:
+                offenders.append(f"{path.relative_to(_PROJECT_ROOT)}:{module_name}")
+    assert not offenders
+
+
+def test_removed_private_module_paths_are_not_importable() -> None:
+    """验证严格切换后不存在可被误用的旧私有模块壳。"""
+    offenders: list[str] = []
+    for module_name in _REMOVED_INTERNAL_MODULES:
+        try:
+            spec = importlib.util.find_spec(module_name)
+        except ModuleNotFoundError:
+            spec = None
+        if spec is not None:
+            offenders.append(module_name)
+    assert not offenders
+
+
+def test_public_facade_imports_do_not_load_heavy_dependencies_or_mutate_env() -> None:
+    """验证三个稳定门面导入时不加载重依赖或修改环境变量。"""
+    script = """
+import os
+import sys
+
+before_env = dict(os.environ)
+import mineru.backend.analyze
+import mineru.render
+from mineru.model.flash import PdfModel
+
+assert PdfModel.__name__ == "PdfModel"
+for prefix in ("torch", "cv2", "pypdfium2", "pdftext", "docx", "bs4", "lxml", "nh3"):
+    assert prefix not in sys.modules, prefix
+    assert not any(name.startswith(prefix + ".") for name in sys.modules), prefix
+assert before_env == dict(os.environ)
+"""
+    result = subprocess.run(
+        [sys.executable, "-c", script],
+        cwd=_PROJECT_ROOT,
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+    assert result.returncode == 0, result.stderr
 
 
 def test_table_merge_package_keeps_one_way_internal_dependencies() -> None:
diff --git a/tests/unittest/test_doclib_app_startup.py b/tests/unittest/test_doclib_app_startup.py
index bfa42644..46922a29 100644
--- a/tests/unittest/test_doclib_app_startup.py
+++ b/tests/unittest/test_doclib_app_startup.py
@@ -16,8 +16,8 @@ from mineru.doclib import app as doclib_app
 from mineru.doclib.app import _assert_required_schema
 from mineru.doclib.core.db import DatabaseManager
 from mineru.doclib.server import _tail_log, _write_temp_asset
+from mineru.model import download as model_download
 from mineru.parser import tier as parser_tier
-from mineru.utils import model_registry
 from mineru.version import __version__
 
 
@@ -138,7 +138,7 @@ def test_config_set_managed_tier_rejects_missing_models(monkeypatch: pytest.Monk
 
     monkeypatch.setattr(doclib_app, "_create_background_task", _skip_background_task)
     monkeypatch.setattr("mineru.doclib.server.ensure_tier_runtime_dependencies", lambda tier: None)
-    monkeypatch.setattr(model_registry.config.model, "base_dir", str(tmp_path / "models"))
+    monkeypatch.setattr(model_download.config.model, "base_dir", str(tmp_path / "models"))
 
     cfg = PatchedConfig(doclib={"data_dir": str(tmp_path), "sqlite": {"path": str(tmp_path / "doclib.db")}})
     with TestClient(doclib_app.create_app(cfg)) as client:
@@ -161,7 +161,7 @@ def test_config_set_managed_advanced_is_rejected(monkeypatch: pytest.MonkeyPatch
 
     monkeypatch.setattr(doclib_app, "_create_background_task", _skip_background_task)
     monkeypatch.setattr("mineru.doclib.server.ensure_tier_runtime_dependencies", lambda tier: None)
-    monkeypatch.setattr(model_registry.config.model, "base_dir", str(tmp_path / "models"))
+    monkeypatch.setattr(model_download.config.model, "base_dir", str(tmp_path / "models"))
 
     cfg = PatchedConfig(doclib={"data_dir": str(tmp_path), "sqlite": {"path": str(tmp_path / "doclib.db")}})
     with TestClient(doclib_app.create_app(cfg)) as client:
@@ -181,7 +181,7 @@ def test_config_set_managed_mode_rejects_missing_models_for_current_tier(
 
     monkeypatch.setattr(doclib_app, "_create_background_task", _skip_background_task)
     monkeypatch.setattr("mineru.doclib.server.ensure_tier_runtime_dependencies", lambda tier: None)
-    monkeypatch.setattr(model_registry.config.model, "base_dir", str(tmp_path / "models"))
+    monkeypatch.setattr(model_download.config.model, "base_dir", str(tmp_path / "models"))
 
     cfg = PatchedConfig(doclib={"data_dir": str(tmp_path), "sqlite": {"path": str(tmp_path / "doclib.db")}})
     with TestClient(doclib_app.create_app(cfg)) as client:
diff --git a/tests/unittest/test_docx_special_char_tables.py b/tests/unittest/test_docx_special_char_tables.py
index 3c681cac..4afa750f 100644
--- a/tests/unittest/test_docx_special_char_tables.py
+++ b/tests/unittest/test_docx_special_char_tables.py
@@ -5,7 +5,7 @@ from docx import Document
 from docx.oxml.ns import qn
 from lxml import etree
 
-from mineru.model.flash.docx.docx_converter import DocxConverter
+from mineru.model.flash.office.docx.docx_converter import DocxConverter
 
 
 NO_BREAK_HYPHEN = "‑"
diff --git a/tests/unittest/test_flash_docx_equationxml.py b/tests/unittest/test_flash_docx_equationxml.py
index f34758d9..67399501 100644
--- a/tests/unittest/test_flash_docx_equationxml.py
+++ b/tests/unittest/test_flash_docx_equationxml.py
@@ -9,15 +9,15 @@ import pytest
 
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.model.flash import DocxModel
-from mineru.model.flash.docx.docx_converter import DocxConverter
-from mineru.model.flash.docx.equationxml import DocxEquationXmlDecoder
-from mineru.model.flash.legacy_office.errors import (
+from mineru.model.flash.office.docx.docx_converter import DocxConverter
+from mineru.model.flash.office.docx.equationxml import DocxEquationXmlDecoder
+from mineru.model.flash.office.legacy.errors import (
     LegacyOfficeResourceLimitError,
 )
 from mineru.render._internal.docx.math import latex_to_omml
 from mineru.types import BlockType, MiddleJson, ModelJson
 
-import mineru.model.flash.docx.equationxml as equationxml_module
+import mineru.model.flash.office.docx.equationxml as equationxml_module
 from _docx_equationxml_test_utils import (
     M_NS,
     WORD_2003_NS,
diff --git a/tests/unittest/test_flash_image_mtef.py b/tests/unittest/test_flash_image_mtef.py
index 2b8f5be7..e8d22170 100644
--- a/tests/unittest/test_flash_image_mtef.py
+++ b/tests/unittest/test_flash_image_mtef.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import pytest
 
-from mineru.model.flash.legacy_office.errors import LegacyOfficeResourceLimitError
+from mineru.model.flash.office.legacy.errors import LegacyOfficeResourceLimitError
 from mineru.model.flash.office import image_equation as image_equation_module
 from mineru.model.flash.office.image_equation import (
     OfficeImageEquationDecoder,
diff --git a/tests/unittest/test_flash_legacy_chart_data.py b/tests/unittest/test_flash_legacy_chart_data.py
index 660b3713..af2f187f 100644
--- a/tests/unittest/test_flash_legacy_chart_data.py
+++ b/tests/unittest/test_flash_legacy_chart_data.py
@@ -6,9 +6,9 @@ import zlib
 from bs4 import BeautifulSoup
 
 from mineru.backend.analyze import doc_analyze
-from mineru.model.flash.ppt import parser as ppt_parser
-from mineru.model.flash.ppt.records import PptRecord
-from mineru.model.flash.xls.embedded_chart import extract_embedded_chart_html
+from mineru.model.flash.office.ppt import parser as ppt_parser
+from mineru.model.flash.office.ppt.records import PptRecord
+from mineru.model.flash.office.xls.embedded_chart import extract_embedded_chart_html
 from mineru.types import BlockType, ChartBlock
 
 from _legacy_ppt_test_utils import _build_cfb
diff --git a/tests/unittest/test_flash_legacy_doc.py b/tests/unittest/test_flash_legacy_doc.py
index 019403f6..9d090b3e 100644
--- a/tests/unittest/test_flash_legacy_doc.py
+++ b/tests/unittest/test_flash_legacy_doc.py
@@ -11,12 +11,12 @@ import pytest
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.backend.postprocess.lists import fix_office_list_blocks
 from mineru.model.flash import DocModel
-from mineru.model.flash.doc.fields import sanitize_hyperlink_target
-from mineru.model.flash.doc.models import DocCharStyle, DocTableCell
-from mineru.model.flash.doc.parser import _RawTableRow, _materialize_table_rows
-from mineru.model.flash.doc.records import DocBudget
-from mineru.model.flash.doc.sprm import apply_character_sprms
-from mineru.model.flash.legacy_office import (
+from mineru.model.flash.office.doc.fields import sanitize_hyperlink_target
+from mineru.model.flash.office.doc.models import DocCharStyle, DocTableCell
+from mineru.model.flash.office.doc.parser import _RawTableRow, _materialize_table_rows
+from mineru.model.flash.office.doc.records import DocBudget
+from mineru.model.flash.office.doc.sprm import apply_character_sprms
+from mineru.model.flash.office.legacy import (
     LegacyOfficeEncryptedError,
     LegacyOfficeMalformedError,
     LegacyOfficeMissingPartError,
@@ -170,7 +170,7 @@ def test_doc_exact_list_label_is_consumed_before_strict_projection() -> None:
 def test_doc_table_grid_materializes_colspan_and_rowspan() -> None:
     """验证 Word table edge 网格能同时恢复横向和纵向合并。"""
 
-    from mineru.model.flash.doc.models import DocTableCellFormat, DocTableFormat
+    from mineru.model.flash.office.doc.models import DocTableCellFormat, DocTableFormat
 
     first = DocTableCell(blocks=[])
     raw_rows = [
@@ -218,7 +218,7 @@ def test_doc_rejects_word95_encryption_rtf_and_missing_word_stream() -> None:
 def test_doc_budget_uses_stable_resource_limit(monkeypatch: pytest.MonkeyPatch) -> None:
     """验证 DOC 记录预算超过固定上限时使用共享错误类型。"""
 
-    import mineru.model.flash.doc.records as records
+    import mineru.model.flash.office.doc.records as records
 
     monkeypatch.setattr(records, "MAX_RECORDS", 1)
     budget = records.DocBudget()
diff --git a/tests/unittest/test_flash_legacy_doc_mtef.py b/tests/unittest/test_flash_legacy_doc_mtef.py
index c5dbf1fb..c037d680 100644
--- a/tests/unittest/test_flash_legacy_doc_mtef.py
+++ b/tests/unittest/test_flash_legacy_doc_mtef.py
@@ -7,7 +7,7 @@ import pytest
 
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.model.flash import DocModel
-from mineru.model.flash.legacy_office.mtef import (
+from mineru.model.flash.office.legacy.mtef import (
     decode_equation_native,
     decode_equation_object,
     decode_mtef_v3,
diff --git a/tests/unittest/test_flash_legacy_ppt.py b/tests/unittest/test_flash_legacy_ppt.py
index 181d753d..8acdf329 100644
--- a/tests/unittest/test_flash_legacy_ppt.py
+++ b/tests/unittest/test_flash_legacy_ppt.py
@@ -11,12 +11,12 @@ from pydantic import ValidationError
 
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.model.flash import PptModel
-from mineru.model.flash.legacy_office import LegacyOfficeEncryptedError, LegacyOfficeResourceLimitError
-from mineru.model.flash.ppt import parser as ppt_parser
-from mineru.model.flash.ppt.models import PptPresentation, PptSlide
-from mineru.model.flash.ppt.ppt_converter import PptConverter
-from mineru.model.flash.ppt.records import PptRecord, RecordBudget
-from mineru.model.flash.ppt.style_text import CharacterRun, StyleRuns
+from mineru.model.flash.office.legacy import LegacyOfficeEncryptedError, LegacyOfficeResourceLimitError
+from mineru.model.flash.office.ppt import parser as ppt_parser
+from mineru.model.flash.office.ppt.models import PptPresentation, PptSlide
+from mineru.model.flash.office.ppt.ppt_converter import PptConverter
+from mineru.model.flash.office.ppt.records import PptRecord, RecordBudget
+from mineru.model.flash.office.ppt.style_text import CharacterRun, StyleRuns
 from mineru.parser import parse
 from mineru.types import BlockType, ChartBlock, ImageBlock, MiddleJson, ModelJson, TableBlock
 
diff --git a/tests/unittest/test_flash_legacy_xls.py b/tests/unittest/test_flash_legacy_xls.py
index 460e314a..d141d684 100644
--- a/tests/unittest/test_flash_legacy_xls.py
+++ b/tests/unittest/test_flash_legacy_xls.py
@@ -10,16 +10,16 @@ import pytest
 
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.model.flash import XlsModel
-from mineru.model.flash.legacy_office import (
+from mineru.model.flash.office.legacy import (
     LegacyOfficeEncryptedError,
     LegacyOfficeMissingPartError,
     LegacyOfficeResourceLimitError,
 )
-from mineru.model.flash.legacy_office.limits import MAX_RECORDS
-from mineru.model.flash.xls import xls_converter as xls_converter_module
-from mineru.model.flash.xls import parser as xls_parser
-from mineru.model.flash.xls.number_format import format_number, format_text
-from mineru.model.flash.xls.records import RecordBudget
+from mineru.model.flash.office.legacy.limits import MAX_RECORDS
+from mineru.model.flash.office.xls import xls_converter as xls_converter_module
+from mineru.model.flash.office.xls import parser as xls_parser
+from mineru.model.flash.office.xls.number_format import format_number, format_text
+from mineru.model.flash.office.xls.records import RecordBudget
 from mineru.parser import parse
 from mineru.types import BlockType, ImageBlock, MiddleJson, ModelJson, TableBlock
 
diff --git a/tests/unittest/test_flash_legacy_xls_ppt_mtef.py b/tests/unittest/test_flash_legacy_xls_ppt_mtef.py
index fdca80eb..07e15fa7 100644
--- a/tests/unittest/test_flash_legacy_xls_ppt_mtef.py
+++ b/tests/unittest/test_flash_legacy_xls_ppt_mtef.py
@@ -8,8 +8,8 @@ import pytest
 
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.model.flash import PptModel, XlsModel
-from mineru.model.flash.legacy_office import LegacyOfficeResourceLimitError
-from mineru.model.flash.legacy_office.limits import MAX_ENTRY_BYTES
+from mineru.model.flash.office.legacy import LegacyOfficeResourceLimitError
+from mineru.model.flash.office.legacy.limits import MAX_ENTRY_BYTES
 from mineru.types import BlockType, MiddleJson, ModelJson
 
 from _legacy_ppt_test_utils import build_equation_ppt
diff --git a/tests/unittest/test_flash_model.py b/tests/unittest/test_flash_model.py
index 7591250d..c8b91c90 100644
--- a/tests/unittest/test_flash_model.py
+++ b/tests/unittest/test_flash_model.py
@@ -6,8 +6,8 @@ from unittest.mock import MagicMock
 import pytest
 
 from mineru.model.flash import PdfModel
-from mineru.model.flash.native_pdf import pipeline
-from mineru.utils.pdf_document import PDFDocument
+from mineru.model.flash.pdf import pipeline
+from mineru.model.flash.pdf.document import PDFDocument
 
 
 def test_pdf_model_predict_returns_native_model_list_without_owning_document(
diff --git a/tests/unittest/test_flash_mtef_v5.py b/tests/unittest/test_flash_mtef_v5.py
index 44d2f102..ace841a3 100644
--- a/tests/unittest/test_flash_mtef_v5.py
+++ b/tests/unittest/test_flash_mtef_v5.py
@@ -4,10 +4,10 @@ import struct
 
 import pytest
 
-from mineru.model.flash.legacy_office import mtef_v5 as mtef_v5_module
-from mineru.model.flash.legacy_office import mtef as mtef_module
-from mineru.model.flash.legacy_office.errors import LegacyOfficeResourceLimitError
-from mineru.model.flash.legacy_office.mtef import (
+from mineru.model.flash.office.legacy import mtef_v5 as mtef_v5_module
+from mineru.model.flash.office.legacy import mtef as mtef_module
+from mineru.model.flash.office.legacy.errors import LegacyOfficeResourceLimitError
+from mineru.model.flash.office.legacy.mtef import (
     decode_equation_native,
     decode_equation_object,
     decode_mtef,
diff --git a/tests/unittest/test_flash_office_image_mtef.py b/tests/unittest/test_flash_office_image_mtef.py
index 37d87116..ad1976cc 100644
--- a/tests/unittest/test_flash_office_image_mtef.py
+++ b/tests/unittest/test_flash_office_image_mtef.py
@@ -17,9 +17,9 @@ from mineru.model.flash import (
     XlsModel,
     XlsxModel,
 )
-from mineru.model.flash.doc.doc_converter import DocConverter
-from mineru.model.flash.docx.docx_converter import DocxConverter
-from mineru.model.flash.doc.models import (
+from mineru.model.flash.office.doc.doc_converter import DocConverter
+from mineru.model.flash.office.docx.docx_converter import DocxConverter
+from mineru.model.flash.office.doc.models import (
     DocImage,
     DocImagePayload,
     DocParagraph,
@@ -27,8 +27,8 @@ from mineru.model.flash.doc.models import (
     DocTableCell,
     DocTableRow,
 )
-from mineru.model.flash.xlsx.xlsx_converter import XlsxConverter
-from mineru.model.flash.pptx.pptx_converter import PptxConverter
+from mineru.model.flash.office.xlsx.xlsx_converter import XlsxConverter
+from mineru.model.flash.office.pptx.pptx_converter import PptxConverter
 from mineru.types import BlockType, MiddleJson, ModelJson
 
 from _docx_equationxml_test_utils import (
diff --git a/tests/unittest/test_flash_office_models.py b/tests/unittest/test_flash_office_models.py
index 11aa7512..f6b94d22 100644
--- a/tests/unittest/test_flash_office_models.py
+++ b/tests/unittest/test_flash_office_models.py
@@ -11,17 +11,17 @@ from unittest.mock import MagicMock
 import pytest
 
 import mineru.model.flash as flash_models
-import mineru.model.flash.model as flat_model_module
+import mineru.model.flash.models as flat_model_module
 from mineru.model.flash import DocModel, DocxModel, PdfModel, PptModel, PptxModel, XlsModel, XlsxModel
-from mineru.model.flash.doc import doc_converter as doc_converter_module
-from mineru.model.flash.docx import docx_converter as docx_converter_module
-from mineru.model.flash.docx import main as docx_main
-from mineru.model.flash.pptx import main as pptx_main
-from mineru.model.flash.pptx import pptx_converter as pptx_converter_module
-from mineru.model.flash.ppt import ppt_converter as ppt_converter_module
-from mineru.model.flash.xls import xls_converter as xls_converter_module
-from mineru.model.flash.xlsx import main as xlsx_main
-from mineru.model.flash.xlsx import xlsx_converter as xlsx_converter_module
+from mineru.model.flash.office.doc import doc_converter as doc_converter_module
+from mineru.model.flash.office.docx import docx_converter as docx_converter_module
+from mineru.model.flash.office.docx import main as docx_main
+from mineru.model.flash.office.pptx import main as pptx_main
+from mineru.model.flash.office.pptx import pptx_converter as pptx_converter_module
+from mineru.model.flash.office.ppt import ppt_converter as ppt_converter_module
+from mineru.model.flash.office.xls import xls_converter as xls_converter_module
+from mineru.model.flash.office.xlsx import main as xlsx_main
+from mineru.model.flash.office.xlsx import xlsx_converter as xlsx_converter_module
 
 
 _PROJECT_ROOT = Path(__file__).resolve().parents[2]
@@ -174,12 +174,12 @@ def test_models_are_exported_from_flash_root() -> None:
 @pytest.mark.parametrize(
     ("package_name", "model_name"),
     [
-        ("mineru.model.flash.doc", "DocModel"),
-        ("mineru.model.flash.docx", "DocxModel"),
-        ("mineru.model.flash.pptx", "PptxModel"),
-        ("mineru.model.flash.ppt", "PptModel"),
-        ("mineru.model.flash.xls", "XlsModel"),
-        ("mineru.model.flash.xlsx", "XlsxModel"),
+        ("mineru.model.flash.office.doc", "DocModel"),
+        ("mineru.model.flash.office.docx", "DocxModel"),
+        ("mineru.model.flash.office.pptx", "PptxModel"),
+        ("mineru.model.flash.office.ppt", "PptModel"),
+        ("mineru.model.flash.office.xls", "XlsModel"),
+        ("mineru.model.flash.office.xlsx", "XlsxModel"),
     ],
 )
 def test_office_subpackages_do_not_export_models(package_name: str, model_name: str) -> None:
@@ -198,13 +198,13 @@ def test_importing_pdf_model_does_not_load_office_converters() -> None:
             "import sys",
             "from mineru.model.flash import PdfModel",
             "assert PdfModel.__name__ == 'PdfModel'",
-            "assert 'mineru.model.flash.docx.docx_converter' not in sys.modules",
-            "assert 'mineru.model.flash.doc.doc_converter' not in sys.modules",
-            "assert 'mineru.model.flash.pptx.pptx_converter' not in sys.modules",
-            "assert 'mineru.model.flash.ppt.ppt_converter' not in sys.modules",
-            "assert 'mineru.model.flash.xls.xls_converter' not in sys.modules",
+            "assert 'mineru.model.flash.office.docx.docx_converter' not in sys.modules",
+            "assert 'mineru.model.flash.office.doc.doc_converter' not in sys.modules",
+            "assert 'mineru.model.flash.office.pptx.pptx_converter' not in sys.modules",
+            "assert 'mineru.model.flash.office.ppt.ppt_converter' not in sys.modules",
+            "assert 'mineru.model.flash.office.xls.xls_converter' not in sys.modules",
             "assert 'olefile' not in sys.modules",
-            "assert 'mineru.model.flash.xlsx.xlsx_converter' not in sys.modules",
+            "assert 'mineru.model.flash.office.xlsx.xlsx_converter' not in sys.modules",
         ]
     )
     result = subprocess.run(
diff --git a/tests/unittest/test_flash_office_mtef_v5.py b/tests/unittest/test_flash_office_mtef_v5.py
index 754a43fb..7eda40f7 100644
--- a/tests/unittest/test_flash_office_mtef_v5.py
+++ b/tests/unittest/test_flash_office_mtef_v5.py
@@ -15,9 +15,9 @@ from mineru.model.flash import (
     XlsModel,
     XlsxModel,
 )
-from mineru.model.flash.docx.docx_converter import DocxConverter
-from mineru.model.flash.pptx.pptx_converter import PptxConverter
-from mineru.model.flash.xlsx.xlsx_converter import XlsxConverter
+from mineru.model.flash.office.docx.docx_converter import DocxConverter
+from mineru.model.flash.office.pptx.pptx_converter import PptxConverter
+from mineru.model.flash.office.xlsx.xlsx_converter import XlsxConverter
 from mineru.types import BlockType, MiddleJson, ModelJson
 
 from _docx_equationxml_test_utils import (
diff --git a/tests/unittest/test_flash_office_title_types.py b/tests/unittest/test_flash_office_title_types.py
index ce6e45a2..b31208a3 100644
--- a/tests/unittest/test_flash_office_title_types.py
+++ b/tests/unittest/test_flash_office_title_types.py
@@ -9,7 +9,7 @@ from pptx import Presentation
 from pptx.enum.shapes import PP_PLACEHOLDER
 
 from mineru.model.flash import DocxModel, PptxModel, XlsxModel
-from mineru.model.flash.pptx.pptx_converter import (
+from mineru.model.flash.office.pptx.pptx_converter import (
     PptxConverter,
     _EFFECTIVE_ALL_BOLD_KEY,
     _EFFECTIVE_FONT_SIZE_KEY,
diff --git a/tests/unittest/test_flash_ooxml_mtef.py b/tests/unittest/test_flash_ooxml_mtef.py
index 3f9b80a5..3734b0e2 100644
--- a/tests/unittest/test_flash_ooxml_mtef.py
+++ b/tests/unittest/test_flash_ooxml_mtef.py
@@ -10,15 +10,15 @@ import pytest
 
 from mineru.backend.analyze import aio_doc_analyze, doc_analyze
 from mineru.model.flash import DocxModel, PptxModel, XlsxModel
-from mineru.model.flash.docx.docx_converter import DocxConverter
-from mineru.model.flash.legacy_office import LegacyOfficeResourceLimitError
-from mineru.model.flash.legacy_office.limits import MAX_ASSET_TOTAL_BYTES
+from mineru.model.flash.office.docx.docx_converter import DocxConverter
+from mineru.model.flash.office.legacy import LegacyOfficeResourceLimitError
+from mineru.model.flash.office.legacy.limits import MAX_ASSET_TOTAL_BYTES
 from mineru.model.flash.office.ooxml_equation import (
     OoxmlEquationDecoder,
     is_mathtype_equation_prog_id,
 )
-from mineru.model.flash.pptx.pptx_converter import PptxConverter
-from mineru.model.flash.xlsx.xlsx_converter import XlsxConverter
+from mineru.model.flash.office.pptx.pptx_converter import PptxConverter
+from mineru.model.flash.office.xlsx.xlsx_converter import XlsxConverter
 from mineru.types import BlockType, MiddleJson, ModelJson
 
 from _mtef_test_utils import build_equation_object, formula_corpus
diff --git a/tests/unittest/test_flash_pdf_auxiliary_text.py b/tests/unittest/test_flash_pdf_auxiliary_text.py
index 29bdd6b3..54718274 100644
--- a/tests/unittest/test_flash_pdf_auxiliary_text.py
+++ b/tests/unittest/test_flash_pdf_auxiliary_text.py
@@ -4,7 +4,7 @@ import inspect
 
 import pytest
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     auxiliary_text,
     models,
     pipeline,
diff --git a/tests/unittest/test_flash_pdf_code_blocks.py b/tests/unittest/test_flash_pdf_code_blocks.py
index 10dc052f..ff43fcff 100644
--- a/tests/unittest/test_flash_pdf_code_blocks.py
+++ b/tests/unittest/test_flash_pdf_code_blocks.py
@@ -6,13 +6,13 @@ from typing import Any
 import pytest
 
 from mineru.model.flash import PdfModel
-from mineru.model.flash.native_pdf import code_blocks, models, pipeline
-from mineru.render._internal.common.inline import (
+from mineru.model.flash.pdf import code_blocks, models, pipeline
+from mineru.backend.postprocess.inline import (
     inline_plain_text,
     parse_inline_content,
 )
-from mineru.utils.pdf_document import PDFDocument, PDFPathInfo
-from mineru.utils.spatial_text import project_pdf_spatial_text
+from mineru.model.flash.pdf.document import PDFDocument, PDFPathInfo
+from mineru.model.flash.pdf.spatial_text import project_pdf_spatial_text
 
 from _flash_pdf_test_utils import _text_line
 
diff --git a/tests/unittest/test_flash_pdf_document_profile.py b/tests/unittest/test_flash_pdf_document_profile.py
index 0b9e86c4..df2647b7 100644
--- a/tests/unittest/test_flash_pdf_document_profile.py
+++ b/tests/unittest/test_flash_pdf_document_profile.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from mineru.model.flash.native_pdf import titles
+from mineru.model.flash.pdf import titles
 
 from _flash_pdf_test_utils import _prepared_text_page, _text_line
 
diff --git a/tests/unittest/test_flash_pdf_extractor.py b/tests/unittest/test_flash_pdf_extractor.py
index 7e3e5fdf..0c29f71d 100644
--- a/tests/unittest/test_flash_pdf_extractor.py
+++ b/tests/unittest/test_flash_pdf_extractor.py
@@ -1,4 +1,4 @@
-from mineru.model.flash.native_pdf import pipeline
+from mineru.model.flash.pdf import pipeline
 
 
 def test_marginal_header_row_does_not_break_two_column_reading_order() -> None:
diff --git a/tests/unittest/test_flash_pdf_formulas.py b/tests/unittest/test_flash_pdf_formulas.py
index f3fae5fd..87e9316b 100644
--- a/tests/unittest/test_flash_pdf_formulas.py
+++ b/tests/unittest/test_flash_pdf_formulas.py
@@ -5,13 +5,13 @@ from dataclasses import replace
 
 import pytest
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     formulas,
     geometry,
     line_merging,
     models,
 )
-from mineru.utils.pdf_document import PDFPathInfo
+from mineru.model.flash.pdf.document import PDFPathInfo
 
 
 from _flash_pdf_test_utils import (
diff --git a/tests/unittest/test_flash_pdf_graphics.py b/tests/unittest/test_flash_pdf_graphics.py
index 947057aa..430827ff 100644
--- a/tests/unittest/test_flash_pdf_graphics.py
+++ b/tests/unittest/test_flash_pdf_graphics.py
@@ -5,12 +5,12 @@ import inspect
 import pytest
 
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     graphics,
     models,
     pipeline,
 )
-from mineru.utils.pdf_document import PDFPathInfo
+from mineru.model.flash.pdf.document import PDFPathInfo
 
 
 from _flash_pdf_test_utils import (
diff --git a/tests/unittest/test_flash_pdf_index_blocks.py b/tests/unittest/test_flash_pdf_index_blocks.py
index 9bed081d..f9509d0f 100644
--- a/tests/unittest/test_flash_pdf_index_blocks.py
+++ b/tests/unittest/test_flash_pdf_index_blocks.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import pytest
 
-from mineru.model.flash.native_pdf import index_blocks
+from mineru.model.flash.pdf import index_blocks
 
 from _flash_pdf_test_utils import _text_line
 
diff --git a/tests/unittest/test_flash_pdf_line_metadata.py b/tests/unittest/test_flash_pdf_line_metadata.py
index aba938a9..f60f0388 100644
--- a/tests/unittest/test_flash_pdf_line_metadata.py
+++ b/tests/unittest/test_flash_pdf_line_metadata.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import pytest
 
-from mineru.model.flash.native_pdf import pipeline
+from mineru.model.flash.pdf import pipeline
 
 
 @pytest.mark.parametrize(
diff --git a/tests/unittest/test_flash_pdf_native_text.py b/tests/unittest/test_flash_pdf_native_text.py
index c5b780da..ada99901 100644
--- a/tests/unittest/test_flash_pdf_native_text.py
+++ b/tests/unittest/test_flash_pdf_native_text.py
@@ -5,7 +5,7 @@ from typing import Any
 
 import pytest
 
-from mineru.model.flash.native_pdf import native_text
+from mineru.model.flash.pdf import native_text
 
 
 def _span(
diff --git a/tests/unittest/test_flash_pdf_pipeline.py b/tests/unittest/test_flash_pdf_pipeline.py
index d56249b1..f4db81c3 100644
--- a/tests/unittest/test_flash_pdf_pipeline.py
+++ b/tests/unittest/test_flash_pdf_pipeline.py
@@ -6,7 +6,7 @@ import inspect
 import pytest
 
 from mineru.model.flash import PdfModel
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     auxiliary_text,
     formulas,
     geometry,
@@ -22,7 +22,7 @@ from mineru.model.flash.native_pdf import (
     titles,
     visual_annotations,
 )
-from mineru.utils.pdf_document import PDFImageInfo
+from mineru.model.flash.pdf.document import PDFImageInfo
 
 from _flash_pdf_test_utils import (
     _prepared_text_page,
diff --git a/tests/unittest/test_flash_pdf_samples.py b/tests/unittest/test_flash_pdf_samples.py
index 5ff2d83c..3c9ac525 100644
--- a/tests/unittest/test_flash_pdf_samples.py
+++ b/tests/unittest/test_flash_pdf_samples.py
@@ -13,7 +13,7 @@ from pypdf import PdfReader
 from mineru.backend.postprocess.page_blocks import process_page_blocks
 from mineru.backend.postprocess.pages import model_json_to_pages
 from mineru.model.flash import PdfModel
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     formulas,
     geometry,
     graphics,
@@ -23,12 +23,12 @@ from mineru.model.flash.native_pdf import (
     tables,
 )
 from mineru.render import render_markdown
-from mineru.render._internal.common.inline import (
+from mineru.backend.postprocess.inline import (
     inline_plain_text,
     parse_inline_content,
 )
 from mineru.types import MiddleJson, ModelJson
-from mineru.utils.pdf_document import PDFDocument, get_lines_from_chars
+from mineru.model.flash.pdf.document import PDFDocument, get_lines_from_chars
 
 
 _PROJECT_ROOT = Path(__file__).parents[2]
diff --git a/tests/unittest/test_flash_pdf_tables.py b/tests/unittest/test_flash_pdf_tables.py
index 7ab9046f..19c54858 100644
--- a/tests/unittest/test_flash_pdf_tables.py
+++ b/tests/unittest/test_flash_pdf_tables.py
@@ -4,12 +4,12 @@ from unittest.mock import MagicMock
 
 import pytest
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     geometry,
     models,
     tables,
 )
-from mineru.utils.pdf_document import PDFPathInfo
+from mineru.model.flash.pdf.document import PDFPathInfo
 
 
 def _axis_line(
diff --git a/tests/unittest/test_flash_pdf_text_blocks.py b/tests/unittest/test_flash_pdf_text_blocks.py
index b25cd8c0..618fc0ef 100644
--- a/tests/unittest/test_flash_pdf_text_blocks.py
+++ b/tests/unittest/test_flash_pdf_text_blocks.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 
 import pytest
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     line_layout,
     line_merging,
     models,
diff --git a/tests/unittest/test_flash_pdf_titles.py b/tests/unittest/test_flash_pdf_titles.py
index e9ee329d..a182c90d 100644
--- a/tests/unittest/test_flash_pdf_titles.py
+++ b/tests/unittest/test_flash_pdf_titles.py
@@ -4,7 +4,7 @@ import inspect
 
 import pytest
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     line_layout,
     line_merging,
     text_blocks,
diff --git a/tests/unittest/test_flash_pdf_visual_annotations.py b/tests/unittest/test_flash_pdf_visual_annotations.py
index cf287eba..fecaf7e8 100644
--- a/tests/unittest/test_flash_pdf_visual_annotations.py
+++ b/tests/unittest/test_flash_pdf_visual_annotations.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import pytest
 
-from mineru.model.flash.native_pdf import (
+from mineru.model.flash.pdf import (
     geometry,
     pipeline,
     text_blocks,
diff --git a/tests/unittest/test_guess_suffix_ole2.py b/tests/unittest/test_guess_suffix_ole2.py
index 429be9e0..1a14a916 100644
--- a/tests/unittest/test_guess_suffix_ole2.py
+++ b/tests/unittest/test_guess_suffix_ole2.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from mineru.utils.guess_suffix_or_lang import (
+from mineru.parser.file_type import (
     _guess_ole2_suffix_by_bytes,
     guess_suffix_by_bytes,
 )
diff --git a/tests/unittest/test_kit_commands.py b/tests/unittest/test_kit_commands.py
index d4ed7cdb..e5017682 100644
--- a/tests/unittest/test_kit_commands.py
+++ b/tests/unittest/test_kit_commands.py
@@ -28,7 +28,7 @@ from mineru.kit.vlm_server import mlx_vlm_server
 from mineru.parser.base import ParseResult
 from mineru.types import BlockType, MiddleJson, PageInfo
 from mineru.utils.image_payload import ImagePayloadCache
-from mineru.utils.model_registry import MODEL_COMPLETE_MARKER
+from mineru.model.registry import MODEL_COMPLETE_MARKER
 from mineru.version import __version__
 
 runner = CliRunner()
diff --git a/tests/unittest/test_managed_process_control.py b/tests/unittest/test_managed_process_control.py
index 80518bc1..d92f7e00 100644
--- a/tests/unittest/test_managed_process_control.py
+++ b/tests/unittest/test_managed_process_control.py
@@ -8,7 +8,7 @@ from pathlib import Path
 
 import pytest
 
-from mineru.utils.managed_process_control import (
+from mineru.parser.process_control import (
     CONTROL_ENV,
     ManagedProcessControl,
     ManagedProcessControlWatcher,
@@ -71,7 +71,7 @@ def test_managed_process_control_works_across_subprocess() -> None:
     child_code = """
 import sys
 import threading
-from mineru.utils.managed_process_control import ManagedProcessControlWatcher
+from mineru.parser.process_control import ManagedProcessControlWatcher
 
 shutdown = threading.Event()
 watcher = ManagedProcessControlWatcher.from_environment(shutdown.set)
diff --git a/tests/unittest/test_markdown_render.py b/tests/unittest/test_markdown_render.py
index b5f1e899..2b9c1c78 100644
--- a/tests/unittest/test_markdown_render.py
+++ b/tests/unittest/test_markdown_render.py
@@ -583,7 +583,7 @@ def test_equation_uses_content_then_image_fallback(monkeypatch: pytest.MonkeyPat
             }
         }
     )
-    monkeypatch.setattr("mineru.render.markdown.config", configured)
+    monkeypatch.setattr("mineru.render._internal.markdown.renderer.config", configured)
     middle = _middle(
         _page(
             0,
diff --git a/tests/unittest/test_models_download_utils.py b/tests/unittest/test_models_download_utils.py
index e7a19b1b..d24d0f87 100644
--- a/tests/unittest/test_models_download_utils.py
+++ b/tests/unittest/test_models_download_utils.py
@@ -5,8 +5,8 @@ from typing import Any, NoReturn
 
 import pytest
 
-from mineru.utils import models_download_utils
-from mineru.utils.model_registry import MODEL_COMPLETE_MARKER, MINERU_2_5_PRO_2605_1_2B, ModelRepo, model_path_exists
+from mineru.model import download as models_download_utils
+from mineru.model.registry import MODEL_COMPLETE_MARKER, MINERU_2_5_PRO_2605_1_2B, ModelRepo, model_path_exists
 
 
 def test_resolve_model_source_does_not_persist_env_auto(monkeypatch: pytest.MonkeyPatch) -> None:
@@ -443,27 +443,27 @@ def test_huggingface_snapshot_rejects_missing_expected_files(
 
 
 def test_resolve_model_stack_explicit_light() -> None:
-    from mineru.utils.model_registry import resolve_model_stack
+    from mineru.model.registry import resolve_model_stack
 
     assert resolve_model_stack("light") == "light"
     assert resolve_model_stack("full") == "full"
 
 
 def test_resolve_model_stack_auto_falls_back_to_get_model_stack(monkeypatch: pytest.MonkeyPatch) -> None:
-    import mineru.utils.config_reader as config_reader
-    from mineru.utils.model_registry import resolve_model_stack
+    import mineru.model.runtime.device as device_runtime
+    from mineru.model.registry import resolve_model_stack
 
-    monkeypatch.setattr(config_reader, "get_model_stack", lambda: "light")
+    monkeypatch.setattr(device_runtime, "get_model_stack", lambda: "light")
     assert resolve_model_stack(None) == "light"
     assert resolve_model_stack("auto") == "light"
 
-    monkeypatch.setattr(config_reader, "get_model_stack", lambda: "full")
+    monkeypatch.setattr(device_runtime, "get_model_stack", lambda: "full")
     assert resolve_model_stack(None) == "full"
     assert resolve_model_stack("auto") == "full"
 
 
 def test_resolve_model_stack_rejects_invalid_value() -> None:
-    from mineru.utils.model_registry import resolve_model_stack
+    from mineru.model.registry import resolve_model_stack
 
     with pytest.raises(ValueError, match="Unsupported stack 'torch'"):
         resolve_model_stack("torch")
diff --git a/tests/unittest/test_native_pdf_table.py b/tests/unittest/test_native_pdf_table.py
index fc81d979..e0673402 100644
--- a/tests/unittest/test_native_pdf_table.py
+++ b/tests/unittest/test_native_pdf_table.py
@@ -9,7 +9,7 @@ from io import BytesIO
 import pytest
 from reportlab.pdfgen.canvas import Canvas
 
-from mineru.utils.native_pdf_table import (
+from mineru.model.flash.pdf.table_recovery import (
     NativeTableCell,
     NativeTableInput,
     NativeTableRectangle,
@@ -18,19 +18,19 @@ from mineru.utils.native_pdf_table import (
     coerce_native_table_rules,
     recover_native_pdf_table,
 )
-from mineru.utils.native_pdf_table.candidate import GridCellSpec, build_candidate
-from mineru.utils.native_pdf_table.contracts import NativeTableCandidate
-from mineru.utils.native_pdf_table.engine import (
+from mineru.model.flash.pdf.table_recovery.candidate import GridCellSpec, build_candidate
+from mineru.model.flash.pdf.table_recovery.contracts import NativeTableCandidate
+from mineru.model.flash.pdf.table_recovery.engine import (
     _remove_undercounted_vector_candidates,
     _select_candidate,
     diagnose_native_pdf_table,
 )
-from mineru.utils.native_pdf_table.text import build_native_table_text
-from mineru.utils.native_pdf_table.vector import (
+from mineru.model.flash.pdf.table_recovery.text import build_native_table_text
+from mineru.model.flash.pdf.table_recovery.vector import (
     MAX_PRIMITIVES_PER_TABLE,
     build_vector_candidates,
 )
-from mineru.utils.pdf_document import PDFDocument
+from mineru.model.flash.pdf.document import PDFDocument
 
 
 def _char_items(
diff --git a/tests/unittest/test_native_pdf_table_demo_manifest.py b/tests/unittest/test_native_pdf_table_demo_manifest.py
index c4221d78..b8e629b8 100644
--- a/tests/unittest/test_native_pdf_table_demo_manifest.py
+++ b/tests/unittest/test_native_pdf_table_demo_manifest.py
@@ -11,14 +11,14 @@ from typing import Any
 from bs4 import BeautifulSoup
 
 from mineru.model.flash import PdfModel
-from mineru.utils.native_pdf_table import (
+from mineru.model.flash.pdf.table_recovery import (
     NativeTableInput,
     coerce_native_table_rectangles,
     coerce_native_table_rules,
     recover_native_pdf_table,
 )
-from mineru.utils.native_pdf_table.engine import diagnose_native_pdf_table
-from mineru.utils.pdf_document import PDFDocument
+from mineru.model.flash.pdf.table_recovery.engine import diagnose_native_pdf_table
+from mineru.model.flash.pdf.document import PDFDocument
 
 
 _PROJECT_ROOT = Path(__file__).parents[2]
diff --git a/tests/unittest/test_native_pdf_table_pipeline.py b/tests/unittest/test_native_pdf_table_pipeline.py
index f93cb404..1be8172d 100644
--- a/tests/unittest/test_native_pdf_table_pipeline.py
+++ b/tests/unittest/test_native_pdf_table_pipeline.py
@@ -14,8 +14,8 @@ from mineru.backend.analysis.pdf import formulas as pdf_formulas
 from mineru.backend.analysis.pdf import layout as pdf_layout
 from mineru.backend.analysis.pdf import tables as pdf_tables
 from mineru.backend.analysis.pdf import window as pdf_window
-from mineru.model.flash.native_pdf import models as flash_models
-from mineru.model.flash.native_pdf import tables as flash_tables
+from mineru.model.flash.pdf import models as flash_models
+from mineru.model.flash.pdf import tables as flash_tables
 from mineru.types import RAW_FORMULA_NUMBER, BlockType
 
 
@@ -491,7 +491,7 @@ def test_high_txt_window_excludes_native_table_from_vlm(
         return model_list
 
     vlm_predictor.batch_extract_with_layout.side_effect = fake_high_extract
-    monkeypatch.setattr(pdf_window, "get_processing_window_size", lambda default: 1)
+    monkeypatch.setattr(pdf_window, "_configured_window_size", lambda default: 1)
     monkeypatch.setattr(
         pdf_window,
         "load_images_from_pdf_bytes_range",
diff --git a/tests/unittest/test_parser_api_contract.py b/tests/unittest/test_parser_api_contract.py
index feeb37b3..ab502939 100644
--- a/tests/unittest/test_parser_api_contract.py
+++ b/tests/unittest/test_parser_api_contract.py
@@ -128,7 +128,7 @@ import os
 os.environ["MINERU_ENABLE_LOCAL_MODEL_INFERENCE_LOCKS"] = "true"
 os.environ["MINERU_ENABLE_PIPELINE_INFERENCE_LOCKS"] = "false"
 
-from mineru.backend import local_model_runtime
+from mineru.model.runtime import hybrid as local_model_runtime
 
 assert hasattr(local_model_runtime, "HybridLocalModelContext")
 assert hasattr(local_model_runtime, "HybridLocalModelContextSingleton")
@@ -156,7 +156,7 @@ print("ok")
 
 def test_validate_effort_rejects_low_and_maps_legacy_backends() -> None:
     """校验 Hybrid effort 只接受 medium/high/xhigh 三档。"""
-    from mineru.utils.backend_options import (
+    from mineru.parser.tier import (
         HYBRID_EFFORT_CHOICES,
         effort_for_tier,
         resolve_backend_and_effort,
diff --git a/tests/unittest/test_parser_model_preload.py b/tests/unittest/test_parser_model_preload.py
index bcc472c5..b073c85f 100644
--- a/tests/unittest/test_parser_model_preload.py
+++ b/tests/unittest/test_parser_model_preload.py
@@ -11,13 +11,6 @@ import mineru.parser.api_server as api_server
 def test_preload_local_models_initializes_conditional_model_families(monkeypatch: pytest.MonkeyPatch) -> None:
     calls: list[tuple[str, str | None]] = []
 
-    class _AtomicModel:
-        TableOrientationCls = "table-orientation"
-        TableCls = "table-classification"
-        WirelessTable = "wireless-table"
-        WiredTable = "wired-table"
-        OCR = "ocr"
-
     class _Manager:
         def get_atom_model(self, atom_model_name: str, **kwargs: str) -> object:
             calls.append((atom_model_name, kwargs.get("lang")))
@@ -27,23 +20,22 @@ def test_preload_local_models_initializes_conditional_model_families(monkeypatch
         atom_model_manager = _Manager()
 
     class _ContextSingleton:
-        def get_model(self, lang: str, formula_enable: bool) -> _Context:
-            calls.append(("context", lang if formula_enable else None))
+        def get_model(self) -> _Context:
+            calls.append(("context", None))
             return _Context()
 
-    fake_runtime = types.ModuleType("mineru.backend.local_model_runtime")
-    fake_runtime.AtomicModel = _AtomicModel
+    fake_runtime = types.ModuleType("mineru.model.runtime.hybrid")
     fake_runtime.HybridLocalModelContextSingleton = _ContextSingleton
-    monkeypatch.setitem(sys.modules, "mineru.backend.local_model_runtime", fake_runtime)
+    monkeypatch.setitem(sys.modules, "mineru.model.runtime.hybrid", fake_runtime)
 
     api_server._preload_local_models("ch")
 
     assert calls == [
-        ("context", "ch"),
-        ("table-orientation", None),
-        ("table-classification", None),
-        ("wireless-table", "ch"),
-        ("wired-table", "ch"),
+        ("context", None),
+        ("table_ori_cls", None),
+        ("table_cls", None),
+        ("wireless_table", "ch"),
+        ("wired_table", "ch"),
         ("ocr", "seal"),
     ]
 
@@ -62,7 +54,7 @@ def test_preload_standard_models_initializes_platform_engine_and_local_models(mo
     calls: list[object] = []
     monkeypatch.setattr(api_server, "_preload_local_models", lambda language: calls.append(("local", language)))
 
-    from mineru.utils import engine_utils
+    from mineru.model.vlm import selector as engine_utils
 
     monkeypatch.setattr(engine_utils, "get_vlm_engine", lambda inference_engine, is_async=False: "lmdeploy-engine")
 
diff --git a/tests/unittest/test_pdf_analyze_block_content.py b/tests/unittest/test_pdf_analyze_block_content.py
index a75315f4..b728655e 100644
--- a/tests/unittest/test_pdf_analyze_block_content.py
+++ b/tests/unittest/test_pdf_analyze_block_content.py
@@ -12,6 +12,7 @@ from mineru.backend import analyze
 from mineru.backend.analysis.pdf import constants, layout, normalization, ocr, pipeline, window
 from mineru.backend.analysis.pdf.text import content as text_content
 from mineru.backend.analysis.pdf.text.models import _AnalyzeLine, _AnalyzeSpan
+from mineru.backend.postprocess import document as postprocess_document
 from mineru.types import RAW_ALGORITHM, RAW_CAPTION, RAW_FOOTNOTE
 from mineru.backend.analysis.pdf.text.native import (
     POST_OCR_FALLBACK_CONTENT_KEY,
@@ -213,7 +214,7 @@ def test_doc_analyze_converts_vlm_results_before_downstream_processing(
         parse_mode=parse_mode,  # type: ignore[arg-type]
         mineru_version="test",
     )
-    monkeypatch.setattr(analyze, "model_json_to_middle_json", MagicMock(return_value=expected_middle_json))
+    monkeypatch.setattr(postprocess_document, "model_json_to_middle_json", MagicMock(return_value=expected_middle_json))
     monkeypatch.setattr(pipeline, "clean_memory", MagicMock())
 
     middle_json, model_json = analyze.doc_analyze(
@@ -551,10 +552,7 @@ def test_text_content_joins_three_line_url_with_accumulated_context() -> None:
         BlockType.TEXT,
     )
 
-    assert content == (
-        "Code at "
-        "https://github.com/google-research/tapas/blob/master/TABLEFORMER.md"
-    )
+    assert content == ("Code at https://github.com/google-research/tapas/blob/master/TABLEFORMER.md")
 
 
 @pytest.mark.parametrize("block_type", [BlockType.CODE, RAW_ALGORITHM])
diff --git a/tests/unittest/test_pdf_analyze_visual_blocks.py b/tests/unittest/test_pdf_analyze_visual_blocks.py
index 02ccf684..982925ce 100644
--- a/tests/unittest/test_pdf_analyze_visual_blocks.py
+++ b/tests/unittest/test_pdf_analyze_visual_blocks.py
@@ -1014,7 +1014,7 @@ def test_flash_ocr_formula_number_merge_runs_before_visual_crop(
             ]
         ]
 
-    monkeypatch.setattr(window, "get_processing_window_size", lambda default: 1)
+    monkeypatch.setattr(window, "_configured_window_size", lambda default: 1)
     monkeypatch.setattr(
         window,
         "load_images_from_pdf_bytes_range",
@@ -1301,7 +1301,7 @@ def test_doc_analyze_office_returns_model_json_without_pdf_processing(
     monkeypatch.setattr(office, "_OFFICE_MODEL_MAP", model_factories)
     monkeypatch.setattr(pipeline, "PDFDocument", pdf_document)
     monkeypatch.setattr(pipeline, "HybridLocalModelContextSingleton", hybrid_model_factory)
-    monkeypatch.setattr(window, "get_processing_window_size", window_size_reader)
+    monkeypatch.setattr(window, "_configured_window_size", window_size_reader)
     monkeypatch.setattr(window, "_build_processing_windows", window_builder)
     monkeypatch.setattr(window, "load_images_from_pdf_bytes_range", image_loader)
     monkeypatch.setattr(window, "_attach_visual_block_images", visual_image_attacher)
@@ -1663,7 +1663,7 @@ def test_pdf_window_releases_rendered_images_when_layout_fails(
     hybrid_model = MagicMock()
     hybrid_model.layout_model.batch_predict.side_effect = RuntimeError("layout failed")
 
-    monkeypatch.setattr(window, "get_processing_window_size", lambda default: 1)
+    monkeypatch.setattr(window, "_configured_window_size", lambda default: 1)
     monkeypatch.setattr(
         window,
         "load_images_from_pdf_bytes_range",
@@ -1873,7 +1873,7 @@ def test_doc_analyze_flash_returns_complete_model_json_and_typed_middle_json(mon
         return value
 
     monkeypatch.setattr(pipeline, "PDFDocument", lambda _: fake_pdf_doc)
-    monkeypatch.setattr(window, "get_processing_window_size", lambda default: 2)
+    monkeypatch.setattr(window, "_configured_window_size", lambda default: 2)
     monkeypatch.setattr(window, "load_images_from_pdf_bytes_range", fake_load_images_for_window)
     monkeypatch.setattr(window, "_attach_visual_block_images", tracked_attach_visual_block_images)
     monkeypatch.setattr(pipeline, "_normalize_pdf_model_list", tracked_normalize_model_list)
diff --git a/tests/unittest/test_pdf_classify.py b/tests/unittest/test_pdf_classify.py
index 5c34d6f0..525a9069 100644
--- a/tests/unittest/test_pdf_classify.py
+++ b/tests/unittest/test_pdf_classify.py
@@ -15,8 +15,8 @@ from pypdf.generic import (
     NumberObject,
 )
 
-from mineru.utils import pdf_classify
-from mineru.utils.pdf_document import PDFDocument
+from mineru.model.flash.pdf import classify as pdf_classify
+from mineru.model.flash.pdf.document import PDFDocument
 
 REPO_ROOT = Path(__file__).resolve().parents[2]
 MIXED_ELEMENTS_PDF = REPO_ROOT / "demo" / "pdfs" / "mixed_elements_pages_07_10.pdf"
diff --git a/tests/unittest/test_pdf_document.py b/tests/unittest/test_pdf_document.py
index 42bdf5b5..9dec77cd 100644
--- a/tests/unittest/test_pdf_document.py
+++ b/tests/unittest/test_pdf_document.py
@@ -20,7 +20,7 @@ from PIL import Image
 from reportlab.lib.utils import ImageReader
 from reportlab.pdfgen.canvas import Canvas
 
-from mineru.utils import pdf_document
+from mineru.model.flash.pdf import document as pdf_document
 
 
 def test_pdf_page_exposes_path_infos_without_raw_pdfium_access() -> None:
diff --git a/tests/unittest/test_pdf_native_script_detection.py b/tests/unittest/test_pdf_native_script_detection.py
index 3c9e080f..fff552ae 100644
--- a/tests/unittest/test_pdf_native_script_detection.py
+++ b/tests/unittest/test_pdf_native_script_detection.py
@@ -9,7 +9,7 @@ from pdftext.schema import Bbox, Char
 from mineru.backend.analysis.pdf.text import native
 from mineru.backend.analysis.pdf.text.models import _AnalyzeSpan
 from mineru.types import ContentType
-from mineru.utils.pdf_document import PDFDocument
+from mineru.model.flash.pdf.document import PDFDocument
 
 
 _PROJECT_ROOT = Path(__file__).resolve().parents[2]
diff --git a/tests/unittest/test_pdf_page_id.py b/tests/unittest/test_pdf_page_id.py
index 5326aa18..28d0d6c5 100644
--- a/tests/unittest/test_pdf_page_id.py
+++ b/tests/unittest/test_pdf_page_id.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import pytest
 
-from mineru.utils.pdf_page_id import parse_page_range
+from mineru.parser.page_range import parse_page_range
 
 
 def test_parse_page_range_empty_means_all_pages() -> None:
diff --git a/tests/unittest/test_pdf_render_diagnostics.py b/tests/unittest/test_pdf_render_diagnostics.py
index 11f0107f..0d7edaf1 100644
--- a/tests/unittest/test_pdf_render_diagnostics.py
+++ b/tests/unittest/test_pdf_render_diagnostics.py
@@ -6,7 +6,7 @@ from typing import Any, cast
 import pytest
 from loguru import logger
 
-from mineru.utils import pdf_image_tools
+from mineru.backend.analysis.pdf import images as pdf_image_tools
 
 
 class _FakeProcess:
diff --git a/tests/unittest/test_pdf_text_styles.py b/tests/unittest/test_pdf_text_styles.py
index 33245ec9..a631d96a 100644
--- a/tests/unittest/test_pdf_text_styles.py
+++ b/tests/unittest/test_pdf_text_styles.py
@@ -25,8 +25,8 @@ from mineru.types import (
     ModelJson,
     PageInfo,
 )
-from mineru.utils.pdf_document import PDFDocument, PDFLinkAnnotation
-from mineru.utils.pdf_text_styles import (
+from mineru.model.flash.pdf.document import PDFDocument, PDFLinkAnnotation
+from mineru.model.flash.pdf.text_styles import (
     PDF_FONT_FORCE_BOLD_FLAG,
     PDF_FONT_ITALIC_FLAG,
     PDFTextLinkLine,
diff --git a/tests/unittest/test_structured_content_render.py b/tests/unittest/test_structured_content_render.py
index bf54df08..6bc34eb8 100644
--- a/tests/unittest/test_structured_content_render.py
+++ b/tests/unittest/test_structured_content_render.py
@@ -307,7 +307,7 @@ def test_structured_content_keeps_chart_content_separate_from_base64_source(
             }
         }
     )
-    monkeypatch.setattr("mineru.render.structured_content.config", configured)
+    monkeypatch.setattr("mineru.render._internal.structured_content.renderer.config", configured)
     chart = ChartBlock(
         type="chart",
         index=0,
@@ -353,7 +353,7 @@ def test_structured_content_renders_equation_as_raw_latex_with_single_image_sour
             }
         }
     )
-    monkeypatch.setattr("mineru.render.structured_content.config", configured)
+    monkeypatch.setattr("mineru.render._internal.structured_content.renderer.config", configured)
     middle = _middle(
         _page(
             0,
diff --git a/tests/unittest/test_text_utils.py b/tests/unittest/test_text_utils.py
index f4b94795..5e220c62 100644
--- a/tests/unittest/test_text_utils.py
+++ b/tests/unittest/test_text_utils.py
@@ -1,6 +1,6 @@
 import pytest
 
-from mineru.utils.text_utils import (
+from mineru.utils.text import (
     merge_text_line_contents,
     resolve_text_line_boundary,
 )