"""Custom exceptions for the NEPSE intelligence system."""


class NepseIntelligenceError(Exception):
    """Base exception for all layers."""
    pass


class ScraperError(NepseIntelligenceError):
    """Raised when an API request or parsing fails."""
    pass


class DataValidationError(NepseIntelligenceError):
    """Raised when input data is missing required columns or invalid."""
    pass


class AuthenticationError(ScraperError):
    """Raised when authentication to an API fails."""
    pass