"""Logging utilities."""
import json
import datetime

class Logger:
    """Simple structured logger."""
    def __init__(self):
        self.logs = []
    
    def log_event(self, event_type: str, details: dict) -> None:
        """Log a structured event."""
        entry = {
            "type": event_type,
            "timestamp": datetime.datetime.now().isoformat(),
            "details": details
        }
        self.logs.append(entry)
        print(json.dumps(entry))