first try

Utils/InputHelper.cs

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+using System;
+using su.divan2000.SalaryApp.Models;
+
+namespace su.divan2000.SalaryApp.Utils
+{
+    public static class InputHelper
+    {
+        public static double AskDouble(string prompt)
+        {
+            double val;
+            while (true)
+            {
+                Console.Write(prompt);
+                if (double.TryParse(Console.ReadLine(), out val))
+                    return val;
+
+                Console.WriteLine("Некорректный ввод. Введите число в формате 1.0, 2.5 и т.д.");
+            }
+        }
+
+        public static int AskInt(string prompt)
+        {
+            int val;
+            while (true)
+            {
+                Console.Write(prompt);
+                if (int.TryParse(Console.ReadLine(), out val))
+                    return val;
+
+                Console.WriteLine("Некорректный ввод. Введите целое число.");
+            }
+        }
+
+        public static bool AskYesNo(string prompt)
+        {
+            while (true)
+            {
+                Console.Write(prompt);
+                string? s = Console.ReadLine()?.Trim().ToLower();
+                if (s == "да") return true;
+                if (s == "нет") return false;
+                Console.WriteLine("Введите 'да' или 'нет'.");
+            }
+        }
+
+        public static SalaryData CreateSalaryData()
+        {
+            while (true)
+            {
+                try
+                {
+                    double salary = AskDouble("Введите оклад: ");
+                    int days = AskInt("Введите количество рабочих дней: ");
+                    int night = AskInt("Введите количество ночных смен: ");
+                    int overtime = AskInt("Введите количество сверхурочных часов: ");
+                    int exp = AskInt("Введите стаж (лет): ");
+                    bool viol = AskYesNo("Были нарушения? (да/нет): ");
+
+                    SalaryData data = new SalaryData(
+                        salary,
+                        days,
+                        night,
+                        overtime,
+                        exp,
+                        viol
+                    );
+
+                    return data;
+                }
+                catch (ArgumentException ex)
+                {
+                    Console.WriteLine($"Ошибка ввода: {ex.Message}");
+                    Console.WriteLine("Попробуйте ещё раз.\n");
+                }
+            }
+        }
+    }
+}

Utils/OutputHelper.cs

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+using System;
+using su.divan2000.SalaryApp.Models;
+
+namespace su.divan2000.SalaryApp.Utils
+{
+    public static class OutputHelper
+    {
+        public static void PrintSalaryData(SalaryData data)
+        {
+            Console.WriteLine("\n=== Результат ===");
+            Console.WriteLine(data);
+        }
+
+        public static void WaitForKey(string message = "Нажмите любую клавишу, чтобы продолжить...")
+        {
+            Console.WriteLine(message);
+            Console.ReadKey();
+        }
+    }
+}

Utils/TUI/Menu.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace su.divan2000.SalaryApp.Utils
+{
+    /// <summary>
+    /// TUI menu;
+    /// </summary>
+    internal class Menu
+    {
+        private List<Option> options;
+        private int selected;
+        private string title;
+        
+        /// <summary>
+        /// Constructor of menu;
+        /// </summary>
+        /// <param name="title">Title of menu</param>
+        public Menu(string title)
+        {
+            this.title = title;
+            this.options = new List<Option> { };
+        }
+
+        /// <summary>
+        /// Add option to menu;
+        /// </summary>
+        /// <param name="name">Name of option</param>
+        /// <param name="action">Action, runs if option selected</param>
+        public void AddOption(string name, Action action)
+        {
+            this.options.Add(new Option(name, action));
+        }
+
+        /// <summary>
+        /// Run menu;
+        /// Console will be clean!;
+        /// </summary>
+        public void RunMenu()
+        {
+            selected = 0;
+            this.PrintMenu();
+            ConsoleKeyInfo keyinfo;
+            do
+            {
+                keyinfo = Console.ReadKey();
+
+                if (keyinfo.Key == ConsoleKey.DownArrow)
+                {
+                    if (selected + 1 < options.Count)
+                    {
+                        selected++;
+                        this.PrintMenu();
+                    }
+                }
+                if (keyinfo.Key == ConsoleKey.UpArrow)
+                {
+                    if (selected > 0)
+                    {
+                        selected--;
+                        this.PrintMenu();
+                    }
+                }
+                if (keyinfo.Key == ConsoleKey.Enter)
+                {
+                    Console.Clear();
+                    options[selected].Action.Invoke();
+                }
+            } while (keyinfo.Key != ConsoleKey.Enter);
+        }
+        private void PrintMenu()
+        {
+            Console.Clear();
+            Console.WriteLine(title);
+            int optionIndex = 0;
+            foreach (Option option in options)
+            {
+                string pointer = optionIndex == selected ? " ->" : "   ";
+                Console.WriteLine($"{pointer}{option.Name}");
+                optionIndex++;
+            }
+        }
+
+        private struct Option
+        {
+            public string Name { get; }
+            public Action Action { get; }
+
+            public Option(string name, Action action)
+            {
+                Name = name;
+                Action = action;
+            }
+        }
+    }
+}