diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index bf47aeb..1eb7699 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ classifiers = [
 ]
 dependencies = [
     "tomli>=2.0.0; python_version < '3.11'",
+    "click>=8.1.0",
     "send2trash>=1.8.2",
 ]
 
diff --git a/src/devklean/__main__.py b/src/devklean/__main__.py
index a44d33d..148fce9 100644
--- a/src/devklean/__main__.py
+++ b/src/devklean/__main__.py
@@ -1,4 +1,4 @@
-from devklean.cli import main
+from devklean.cli.main import main
 
 if __name__ == "__main__":
     main()
diff --git a/src/devklean/cli/__init__.py b/src/devklean/cli/__init__.py
index 97e5b66..acfa9b7 100644
--- a/src/devklean/cli/__init__.py
+++ b/src/devklean/cli/__init__.py
@@ -1,3 +1,11 @@
-from devklean.cli.main import main
+from __future__ import annotations
+
+from importlib import import_module
 
 __all__ = ["main"]
+
+
+def __getattr__(name: str):
+    if name == "main":
+        return import_module("devklean.cli.main").main
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
diff --git a/src/devklean/cli/commands/__init__.py b/src/devklean/cli/commands/__init__.py
index cfa7679..e684911 100644
--- a/src/devklean/cli/commands/__init__.py
+++ b/src/devklean/cli/commands/__init__.py
@@ -1,4 +1,13 @@
-from devklean.cli.commands.clean import run_clean
-from devklean.cli.commands.scan import run_scan
+from __future__ import annotations
+
+from importlib import import_module
 
 __all__ = ["run_clean", "run_scan"]
+
+
+def __getattr__(name: str):
+    if name == "run_clean":
+        return import_module("devklean.cli.commands.clean").run_clean
+    if name == "run_scan":
+        return import_module("devklean.cli.commands.scan").run_scan
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
diff --git a/src/devklean/cli/commands/clean.py b/src/devklean/cli/commands/clean.py
index 543d569..6b15136 100644
--- a/src/devklean/cli/commands/clean.py
+++ b/src/devklean/cli/commands/clean.py
@@ -9,11 +9,17 @@
     exceeds_threshold,
 )
 from devklean.config.models import AppConfig
-from devklean.deletion import SafetyValidator, delete_items
+from devklean.deletion.safety import SafetyValidator
 from devklean.models import CleanableItem
 from devklean.output.base import Renderer
 
 
+def delete_items(*args, **kwargs):
+    from devklean.deletion import delete_items as _delete_items
+
+    return _delete_items(*args, **kwargs)
+
+
 def _confirm_deletion(
     renderer: Renderer,
     count: int,
diff --git a/src/devklean/cli/main.py b/src/devklean/cli/main.py
index 92e68ec..cfac6d7 100644
--- a/src/devklean/cli/main.py
+++ b/src/devklean/cli/main.py
@@ -2,6 +2,8 @@
 
 import sys
 
+import click
+
 from devklean.cli.dispatcher import dispatch
 from devklean.cli.parser import build_parser, resolve_bare_invocation
 from devklean.config import ConfigManager
@@ -62,5 +64,5 @@ def main() -> None:
             sys.exit(exit_code)
     except KeyboardInterrupt:
         # 130 is the Unix convention for a SIGINT-terminated process (128 + 2).
-        print("\nAborted.", file=sys.stderr)
+        click.echo("\nAborted.", file=sys.stderr)
         sys.exit(130)
diff --git a/src/devklean/deletion/__init__.py b/src/devklean/deletion/__init__.py
index 80409e6..2864cc4 100644
--- a/src/devklean/deletion/__init__.py
+++ b/src/devklean/deletion/__init__.py
@@ -1,10 +1,6 @@
 from __future__ import annotations
 
-from devklean.deletion.integrity import IntegrityReport, check_integrity
-from devklean.deletion.metadata import MetadataManager
-from devklean.deletion.paths import get_deletion_metadata_dir
-from devklean.deletion.safety import SafetyValidator, SafetyViolation
-from devklean.deletion.trash import delete_items
+from importlib import import_module
 
 __all__ = [
     "IntegrityReport",
@@ -15,3 +11,21 @@
     "delete_items",
     "get_deletion_metadata_dir",
 ]
+
+
+def __getattr__(name: str):
+    if name == "IntegrityReport":
+        return import_module("devklean.deletion.integrity").IntegrityReport
+    if name == "check_integrity":
+        return import_module("devklean.deletion.integrity").check_integrity
+    if name == "MetadataManager":
+        return import_module("devklean.deletion.metadata").MetadataManager
+    if name == "get_deletion_metadata_dir":
+        return import_module("devklean.deletion.paths").get_deletion_metadata_dir
+    if name == "SafetyValidator":
+        return import_module("devklean.deletion.safety").SafetyValidator
+    if name == "SafetyViolation":
+        return import_module("devklean.deletion.safety").SafetyViolation
+    if name == "delete_items":
+        return import_module("devklean.deletion.trash").delete_items
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
diff --git a/src/devklean/output/__init__.py b/src/devklean/output/__init__.py
index 65f1000..da8f076 100644
--- a/src/devklean/output/__init__.py
+++ b/src/devklean/output/__init__.py
@@ -1,5 +1,15 @@
-from devklean.output.base import Renderer
-from devklean.output.json import JsonRenderer
-from devklean.output.text import TextRenderer
+from __future__ import annotations
+
+from importlib import import_module
 
 __all__ = ["JsonRenderer", "Renderer", "TextRenderer"]
+
+
+def __getattr__(name: str):
+    if name == "Renderer":
+        return import_module("devklean.output.base").Renderer
+    if name == "JsonRenderer":
+        return import_module("devklean.output.json").JsonRenderer
+    if name == "TextRenderer":
+        return import_module("devklean.output.text").TextRenderer
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
diff --git a/src/devklean/output/console.py b/src/devklean/output/console.py
index 52a31be..b90e5fc 100644
--- a/src/devklean/output/console.py
+++ b/src/devklean/output/console.py
@@ -4,6 +4,8 @@
 import sys
 from typing import TextIO
 
+import click
+
 from devklean.output.theme import Palette, get_theme
 
 # Semantic symbols — fixed across every command and renderer.
@@ -73,7 +75,7 @@ def paint(self, text: str, role: str) -> str:
 
     def _line(self, symbol: str, role: str, message: str) -> None:
         prefix = self.paint(symbol, role)
-        print(f"{prefix} {message}", file=self._stream)
+        click.echo(f"{prefix} {message}", file=self._stream)
 
     def success(self, message: str) -> None:
         self._line(SYM_SUCCESS, "success", message)
@@ -88,7 +90,7 @@ def info(self, message: str) -> None:
         self._line(SYM_INFO, "info", message)
 
     def detail(self, message: str) -> None:
-        print(self.paint(message, "detail"), file=self._stream)
+        click.echo(self.paint(message, "detail"), file=self._stream)
 
     def plain(self, message: str = "") -> None:
-        print(message, file=self._stream)
+        click.echo(message, file=self._stream)
diff --git a/src/devklean/tui.py b/src/devklean/tui.py
index 4d90adf..8c4d5ca 100644
--- a/src/devklean/tui.py
+++ b/src/devklean/tui.py
@@ -5,13 +5,19 @@
     confirm_large_deletion,
     exceeds_threshold,
 )
-from devklean.deletion import SafetyValidator, delete_items
+from devklean.deletion.safety import SafetyValidator
 from devklean.formatting import format_size, truncate
 from devklean.models import CleanableItem
 from devklean.output.base import Renderer
 from devklean.output.sorting import items_by_size_desc
 
 
+def delete_items(*args, **kwargs):
+    from devklean.deletion import delete_items as _delete_items
+
+    return _delete_items(*args, **kwargs)
+
+
 def interactive_ui(stdscr, items: list[CleanableItem], dry_run: bool) -> list[int] | None:
     import curses  # Unix-only; imported lazily so this module loads on Windows.
 
diff --git a/tests/test_windows_guard.py b/tests/test_windows_guard.py
index dec5a85..beea530 100644
--- a/tests/test_windows_guard.py
+++ b/tests/test_windows_guard.py
@@ -10,6 +10,7 @@
 from __future__ import annotations
 
 import io
+import os
 import subprocess
 import sys
 from argparse import Namespace
@@ -52,10 +53,12 @@ def test_tui_module_imports_cold_without_curses() -> None:
     crash every command on Windows) and an import-order/circular-import
     regression that an in-process import would mask.
     """
+    env = {**os.environ, "PYTHONPATH": str(Path(__file__).resolve().parents[1] / "src")}
     result = subprocess.run(
         [sys.executable, "-c", "import devklean.tui; print(devklean.tui.run_interactive.__name__)"],
         capture_output=True,
         text=True,
+        env=env,
     )
     assert result.returncode == 0, result.stderr
     assert "run_interactive" in result.stdout