diff --git a/dev_env_sync/core/platform.py b/dev_env_sync/core/platform.py
new file mode 100644
index 0000000..d591012
--- /dev/null
+++ b/dev_env_sync/core/platform.py
@@ -0,0 +1,233 @@
+"""Platform detection for Linux, macOS, and WSL environments."""
+
+import os
+import platform
+import re
+from dataclasses import dataclass
+from enum import Enum
+from pathlib import Path
+from typing import Optional
+
+
+class Platform(Enum):
+    """Supported platforms."""
+    LINUX = "linux"
+    MACOS = "macos"
+    WSL = "wsl"
+    UNKNOWN = "unknown"
+
+
+@dataclass
+class PlatformInfo:
+    """Information about the current platform."""
+    system: str
+    release: str
+    version: str
+    machine: str
+    platform: Platform
+    is_wsl: bool
+    wsl_version: Optional[str] = None
+
+
+class PlatformNotSupported(Exception):
+    """Raised when the platform is not supported."""
+    pass
+
+
+class PlatformDetector:
+    """Detects and provides information about the current platform."""
+    
+    WSL_PATTERN = re.compile(r'(microsoft|wsl|WSL)', re.IGNORECASE)
+    
+    @staticmethod
+    def detect() -> PlatformInfo:
+        """Detect the current platform and return detailed information."""
+        system = platform.system()
+        release = platform.release()
+        version = platform.version()
+        machine = platform.machine()
+        
+        is_wsl, wsl_version = PlatformDetector._detect_wsl()
+        
+        platform_enum = Platform.UNKNOWN
+        
+        if system == "Darwin":
+            platform_enum = Platform.MACOS
+        elif system == "Linux":
+            if is_wsl:
+                platform_enum = Platform.WSL
+            else:
+                platform_enum = Platform.LINUX
+        
+        return PlatformInfo(
+            system=system,
+            release=release,
+            version=version,
+            machine=machine,
+            platform=platform_enum,
+            is_wsl=is_wsl,
+            wsl_version=wsl_version,
+        )
+    
+    @staticmethod
+    def _detect_wsl() -> tuple[bool, Optional[str]]:
+        """Detect if running in WSL and return version info."""
+        try:
+            os_release_path = Path("/proc/sys/kernel/osrelease")
+            if os_release_path.exists():
+                content = os_release_path.read_text().strip()
+                if PlatformDetector.WSL_PATTERN.search(content):
+                    wsl_version = content
+                    return True, wsl_version
+        except (IOError, PermissionError):
+            pass
+        
+        try:
+            version_path = Path("/proc/version")
+            if version_path.exists():
+                content = version_path.read_text().strip()
+                if PlatformDetector.WSL_PATTERN.search(content):
+                    return True, content
+        except (IOError, PermissionError):
+            pass
+        
+        if "microsoft" in platform.release().lower():
+            return True, platform.release()
+        
+        return False, None
+    
+    @staticmethod
+    def is_linux() -> bool:
+        """Check if running on Linux."""
+        return platform.system() == "Linux" and not PlatformDetector._detect_wsl()[0]
+    
+    @staticmethod
+    def is_macos() -> bool:
+        """Check if running on macOS."""
+        return platform.system() == "Darwin"
+    
+    @staticmethod
+    def is_wsl() -> bool:
+        """Check if running on WSL."""
+        return PlatformDetector._detect_wsl()[0]
+    
+    @staticmethod
+    def is_supported() -> bool:
+        """Check if the current platform is supported."""
+        return PlatformDetector.detect().platform != Platform.UNKNOWN
+    
+    @staticmethod
+    def get_shell_config_dir() -> Path:
+        """Get the platform-specific shell configuration directory."""
+        info = PlatformDetector.detect()
+        
+        if info.platform == Platform.MACOS:
+            return Path.home() / ".config"
+        elif info.platform in (Platform.LINUX, Platform.WSL):
+            xdg_config = os.environ.get("XDG_CONFIG_HOME")
+            if xdg_config:
+                return Path(xdg_config)
+            return Path.home() / ".config"
+        else:
+            return Path.home()
+    
+    @staticmethod
+    def get_home_dir() -> Path:
+        """Get the user's home directory."""
+        return Path.home()
+    
+    @staticmethod
+    def get_backup_dir() -> Path:
+        """Get the default backup directory based on platform."""
+        return PlatformDetector.get_home_dir() / ".dev-env-sync-backups"
+    
+    @staticmethod
+    def get_editor_config_dir(editor: str) -> Path:
+        """Get the platform-specific config directory for an editor."""
+        info = PlatformDetector.detect()
+        home = Path.home()
+        
+        if editor == "vscode":
+            if info.platform == Platform.MACOS:
+                return home / "Library/Application Support/Code/User"
+            else:
+                xdg_config = os.environ.get("XDG_CONFIG_HOME")
+                if xdg_config:
+                    return Path(xdg_config) / "Code/User"
+                return home / ".config/Code/User"
+        
+        elif editor == "neovim":
+            if info.platform == Platform.MACOS:
+                return home / ".config/nvim"
+            else:
+                xdg_config = os.environ.get("XDG_CONFIG_HOME")
+                if xdg_config:
+                    return Path(xdg_config) / "nvim"
+                return home / ".config/nvim"
+        
+        elif editor == "vim":
+            if info.platform == Platform.MACOS:
+                return home
+            else:
+                return home
+        
+        else:
+            return PlatformDetector.get_shell_config_dir()
+    
+    @staticmethod
+    def get_package_manager() -> str:
+        """Get the appropriate package manager for the platform."""
+        info = PlatformDetector.detect()
+        
+        if info.platform == Platform.MACOS:
+            return "brew"
+        elif info.platform == Platform.WSL:
+            if PlatformDetector._has_command("apt"):
+                return "apt"
+            elif PlatformDetector._has_command("dnf"):
+                return "dnf"
+            elif PlatformDetector._has_command("yum"):
+                return "yum"
+        elif info.platform == Platform.LINUX:
+            if PlatformDetector._has_command("apt"):
+                return "apt"
+            elif PlatformDetector._has_command("dnf"):
+                return "dnf"
+            elif PlatformDetector._has_command("yum"):
+                return "yum"
+            elif PlatformDetector._has_command("pacman"):
+                return "pacman"
+        
+        return "unknown"
+    
+    @staticmethod
+    def _has_command(cmd: str) -> bool:
+        """Check if a command is available."""
+        import shutil
+        return shutil.which(cmd) is not None
+    
+    @staticmethod
+    def normalize_path(path: str) -> Path:
+        """Normalize a path for the current platform."""
+        path_obj = Path(path).expanduser()
+        
+        if not path_obj.is_absolute():
+            if path.startswith("~"):
+                path_obj = Path.home() / path[2:]
+            else:
+                path_obj = Path.cwd() / path_obj
+        
+        return path_obj
+    
+    @staticmethod
+    def get_path_separator() -> str:
+        """Get the path separator for the current platform."""
+        return "/" if platform.system() != "Windows" else "\\"
+    
+    @staticmethod
+    def get_line_ending() -> str:
+        """Get the appropriate line ending for the current platform."""
+        info = PlatformDetector.detect()
+        if info.platform == Platform.MACOS and platform.mac_ver()[0].startswith("10"):
+            return "\r"
+        return "\n"