diff --git a/croppa/main.py b/croppa/main.py
index 13b166d..6503ec5 100644
--- a/croppa/main.py
+++ b/croppa/main.py
@@ -757,6 +757,8 @@ class VideoEditor:
 
     # Crop adjustment settings
     CROP_SIZE_STEP = 5  # pixels to expand/contract crop
+    CROP_MIN_SIZE = 10  # minimum crop width/height in pixels
+    CROP_BORDER_DETECTION_MAX_DISTANCE = 800  # pixels - maximum distance for border hit detection
 
     # Motion tracking settings
     TRACKING_POINT_THRESHOLD = 10  # pixels for delete/snap radius
@@ -3773,7 +3775,7 @@ class VideoEditor:
 
         # Handle crop border dragging (only when Shift and Ctrl are NOT pressed)
         if not (flags & cv2.EVENT_FLAG_SHIFTKEY) and not (flags & cv2.EVENT_FLAG_CTRLKEY) and self.crop_rect:
-            border_threshold = 800  # pixels - maximum distance to consider
+            border_threshold = self.CROP_BORDER_DETECTION_MAX_DISTANCE
             
             # Get effective crop in rotated coords and map to screen
             eff_x, eff_y, eff_w, eff_h = self._get_effective_crop_rect_for_frame(getattr(self, 'current_frame', 0))
@@ -4351,7 +4353,7 @@ class VideoEditor:
                 self.crop_rect = (x, new_y, w, new_h)
             else:
                 # Contract from bottom - decrease height
-                new_h = max(10, h - amount)  # Minimum size of 10 pixels
+                new_h = max(self.CROP_MIN_SIZE, h - amount)
                 self.crop_rect = (x, y, w, new_h)
 
         elif direction == 'down':
@@ -4361,7 +4363,7 @@ class VideoEditor:
                 self.crop_rect = (x, y, w, new_h)
             else:
                 # Contract from top - increase y, decrease height
-                amount = min(amount, h - 10)  # Don't make it smaller than 10 pixels
+                amount = min(amount, h - self.CROP_MIN_SIZE)  # Don't make it smaller than 10 pixels
                 new_y = y + amount
                 new_h = h - amount
                 self.crop_rect = (x, new_y, w, new_h)
@@ -4374,7 +4376,7 @@ class VideoEditor:
                 self.crop_rect = (new_x, y, new_w, h)
             else:
                 # Contract from right - decrease width
-                new_w = max(10, w - amount)  # Minimum size of 10 pixels
+                new_w = max(self.CROP_MIN_SIZE, w - amount)
                 self.crop_rect = (x, y, new_w, h)
 
         elif direction == 'right':
@@ -4384,7 +4386,7 @@ class VideoEditor:
                 self.crop_rect = (x, y, new_w, h)
             else:
                 # Contract from left - increase x, decrease width
-                amount = min(amount, w - 10)  # Don't make it smaller than 10 pixels
+                amount = min(amount, w - self.CROP_MIN_SIZE)  # Don't make it smaller than 10 pixels
                 new_x = x + amount
                 new_w = w - amount
                 self.crop_rect = (new_x, y, new_w, h)