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from functools import partial
import tkinter as tk

def button_countdown(label, counter):
    stand = counter.get() - 1
    counter.set(stand)
    label.configure(fg='red' if stand == 0 else 'black')
    if stand > 0:
        label.after(1000, button_countdown, label, counter)

def button_start(label, counter):
    label.after(1000, button_countdown, label, counter)

def button_reset(label, counter, start_value):
    counter.set(start_value.get())
    label.configure(fg='black')

def main():
    root = tk.Tk()
    root.title('Countdown')
    root.geometry('790x425')
    counter = tk.IntVar(root)
    start_value = tk.IntVar(root, 10)

    label = tk.Label(root, textvariable=counter, font=('Arial', 190))
    label.grid(column=2,row=2)
    tk.Button(root, text='START', command=partial(button_start, label, counter), font=('Arial', 32)).grid(column=1,row=3)
    tk.Button(root, text='RESET', command=partial(button_reset, label, counter, start_value), font=('Arial', 32)).grid(column=3,row=3)
    tk.Label(root, text='Startwert').grid(column=1,row=4)
    tk.Entry(root, textvariable=start_value).grid(column=2,row=4)
    root.mainloop()

if __name__ == '__main__':
    main()