sequenceDiagram
  autonumber
  actor Caller
  participant LoggingRule
  participant LevelFilter as Internal Level Filter

  rect rgba(200,240,255,0.3)
    Note over Caller,LoggingRule: Construction path (changed)
    Caller->>LoggingRule: new LoggingRule(minLevel, maxLevel[, target])
    LoggingRule->>LevelFilter: set Off
    LoggingRule->>LoggingRule: EnableLoggingForLevels(minLevel, maxLevel)
    alt minLevel == Off
      LoggingRule-->>LoggingRule: early return (no levels enabled)
    else
      LoggingRule->>LevelFilter: enable range [minLevel..maxLevel]
    end
  end

  rect rgba(220,255,220,0.3)
    Note over Caller,LoggingRule: SetLoggingLevels (changed)
    Caller->>LoggingRule: SetLoggingLevels(minLevel, maxLevel)
    LoggingRule->>LevelFilter: set Off
    LoggingRule->>LoggingRule: EnableLoggingForLevels(minLevel, maxLevel)
    alt minLevel == Off
      LoggingRule-->>LoggingRule: early return
    else
      LoggingRule->>LevelFilter: enable range [minLevel..maxLevel]
    end
  end

  rect rgba(255,240,200,0.3)
    Note over Caller,LoggingRule: Per-level enable/disable (guards added)
    Caller->>LoggingRule: Enable/DisableLoggingForLevel(level)
    alt level == Off
      LoggingRule-->>Caller: no-op
    else
      LoggingRule->>LoggingRule: Guard.ThrowIfNull(level)
      LoggingRule->>LevelFilter: toggle level on/off
    end
  end