diff --git a/man_card/config.py b/man_card/config.py
new file mode 100644
index 0000000..3f147b7
--- /dev/null
+++ b/man_card/config.py
@@ -0,0 +1,53 @@
+"""Configuration management module."""
+
+import os
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Optional
+
+
+@dataclass
+class Config:
+    """Application configuration."""
+    default_format: str = "pdf"
+    default_dpi: int = 150
+    default_template: str = "default"
+    page_size: str = "a4"
+
+    @classmethod
+    def from_env(cls) -> "Config":
+        """Load configuration from environment variables."""
+        return cls(
+            default_format=os.getenv("MANCARD_DEFAULT_FORMAT", "pdf"),
+            default_dpi=int(os.getenv("MANCARD_DEFAULT_DPI", "150")),
+            default_template=os.getenv("MANCARD_DEFAULT_TEMPLATE", "default"),
+            page_size=os.getenv("MANCARD_PAGE_SIZE", "a4")
+        )
+
+    @classmethod
+    def from_dotenv(cls, path: Optional[str] = None) -> "Config":
+        """Load configuration from .env file."""
+        try:
+            from dotenv import load_dotenv
+            if path is None:
+                path = Path(__file__).parent.parent / ".env"
+            elif isinstance(path, str):
+                path = Path(path)
+
+            if path.exists():
+                load_dotenv(path)
+        except ImportError:
+            pass
+
+        return cls.from_env()
+
+    def merge(self, **overrides) -> "Config":
+        """Create a new config with overridden values."""
+        data = {
+            "default_format": self.default_format,
+            "default_dpi": self.default_dpi,
+            "default_template": self.default_template,
+            "page_size": self.page_size
+        }
+        data.update({k: v for k, v in overrides.items() if v is not None})
+        return cls(**data)