[Python] Pygame IndexError Rect displayed in middle correctly, trouble with mouse clicks...

I'm trying to make a grid towards the middle of the window and can get the tiles to update however if I click where the tiles are visibly on screen I get an error.

The input seems to be stuck at the top left. How can I update this? Thanks!

line 49, IndexError: list index out of range

import pygame

pygame.init()
pygame.font.init()

colorBlack = (000, 000, 000); colorWhite = (255, 255, 255); colorRed = (255, 000, 000)

winWidth = 1280; winHeight = 720; FPS = 30
winDisplay = pygame.display.set_mode((winWidth, winHeight))
FPSClock = pygame.time.Clock()
running = True

def drawGrid():
blockSize = 47 #Pixel count for each grid block
gridSize = 10 #Size of grid (5x5, 10x10, etc.)
gridFrame = 479 #Size of the grid frame (in pixels)
gridFrameX = 501 #X position of the grid frame
gridFrameY = 221 #Y position of the grid frame
gridFrameRect = (gridFrameX, gridFrameY, gridFrame, gridFrame) #Grid frame rectangle
gridSolution = [[0] * gridSize for _ in range(gridSize)] #Grid solution (2D array)
gridPuzzle = [[0] * gridSize for _ in range(gridSize)] #Grid puzzle (2D array)

gridPuzzle[0][0] = 1 #Set the first cell of the puzzle to 1 (black)

while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
quit()

if event.type == pygame.KEYDOWN:
if event.key == pygame.K_ESCAPE:
quit()
if event.key == pygame.K_r:
drawGrid()

if event.type == pygame.MOUSEBUTTONDOWN:
x, y = pygame.mouse.get_pos()
print("Mouse position: ", x, y)
gridRow = y // blockSize
gridCol = x // blockSize
gridPuzzle[gridRow][gridCol] = 1 - gridPuzzle[gridRow][gridCol]
print("Grid cell toggled at: ", gridRow, gridCol)

pygame.draw.rect(winDisplay, colorBlack, (0, 0, 501, winHeight))
pygame.draw.rect(winDisplay, colorBlack, (501, 0, 772, 221))

for gameRow in range(gridSize):
for gameCol in range(gridSize):
rect = (gridFrameX + gameCol * blockSize, gridFrameY + gameRow * blockSize, blockSize, blockSize)
pygame.draw.rect(winDisplay, colorBlack, rect, 1) #Draw the grid cell outline
if gridPuzzle[gameRow][gameCol] == 1:
pygame.draw.rect(winDisplay, colorRed, rect) #Draw the filled cell
if gridPuzzle[gameRow][gameCol] == 0:
pygame.draw.rect(winDisplay, colorWhite, rect) #Draw the empty cell

pygame.draw.rect(winDisplay, colorBlack, gridFrameRect, 1) #Draw the grid
pygame.display.update()
FPSClock.tick(FPS)

def quit():
running = False
pygame.quit()

if __name__ == "__main__":
drawGrid()

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