diff --git a/scripts/build_icons.py b/scripts/build_icons.py
index 7d4923d..3b726a1 100644
--- a/scripts/build_icons.py
+++ b/scripts/build_icons.py
@@ -10,13 +10,11 @@ Requirements:
     pip install pillow          # for .ico
     iconutil                   # built into macOS; for .icns
 """
+
 from __future__ import annotations
 
-import os
-import platform
 import shutil
 import subprocess
-import sys
 import tempfile
 from pathlib import Path
 
@@ -32,7 +30,8 @@ def build_ico():
         print("Pillow not installed — skipping .ico generation (pip install pillow)")
         return
 
-    import io, struct
+    import io
+    import struct
 
     sizes = [16, 24, 32, 48, 64, 128, 256]
     images: list[tuple[int, object]] = []
@@ -58,18 +57,21 @@ def build_ico():
         # biHeight is doubled: top half = XOR mask (color), bottom = AND mask
         hdr = struct.pack(
             "<IiiHHIIiiII",
-            40,     # biSize
+            40,  # biSize
             w,
             h * 2,  # biHeight (doubled per ICO convention)
-            1,      # biPlanes
-            32,     # biBitCount
-            0,      # biCompression (BI_RGB)
-            0,      # biSizeImage (0 ok for BI_RGB)
-            0, 0, 0, 0,
+            1,  # biPlanes
+            32,  # biBitCount
+            0,  # biCompression (BI_RGB)
+            0,  # biSizeImage (0 ok for BI_RGB)
+            0,
+            0,
+            0,
+            0,
         )
         pix = img.load()
         rows = bytearray()
-        for y in range(h - 1, -1, -1):   # bottom-up
+        for y in range(h - 1, -1, -1):  # bottom-up
             for x in range(w):
                 r, g, b, a = pix[x, y]
                 rows += bytes([b, g, r, a])
@@ -88,14 +90,14 @@ def build_ico():
         blobs.append((s, bmp_dib(img) if s < 256 else png_bytes(img)))
 
     n = len(blobs)
-    dir_offset = 6 + n * 16   # ICONDIR (6) + n × ICONDIRENTRY (16)
+    dir_offset = 6 + n * 16  # ICONDIR (6) + n × ICONDIRENTRY (16)
 
     out = bytearray()
-    out += struct.pack("<HHH", 0, 1, n)   # ICONDIR
+    out += struct.pack("<HHH", 0, 1, n)  # ICONDIR
 
     cur = dir_offset
     for s, blob in blobs:
-        w = h = s % 256    # 256 is stored as 0 in the byte field
+        w = h = s % 256  # 256 is stored as 0 in the byte field
         out += struct.pack("<BBBBHHII", w, h, 0, 0, 1, 32, len(blob), cur)
         cur += len(blob)
 
@@ -115,15 +117,15 @@ def build_icns():
     iconset = Path(tempfile.mkdtemp()) / "app.iconset"
     iconset.mkdir()
     mapping = {
-        "icon_16x16.png":    "icon-16.png",
+        "icon_16x16.png": "icon-16.png",
         "icon_16x16@2x.png": "icon-32.png",
-        "icon_32x32.png":    "icon-32.png",
+        "icon_32x32.png": "icon-32.png",
         "icon_32x32@2x.png": "icon-64.png",
-        "icon_128x128.png":  "icon-128.png",
+        "icon_128x128.png": "icon-128.png",
         "icon_128x128@2x.png": "icon-256.png",
-        "icon_256x256.png":  "icon-256.png",
+        "icon_256x256.png": "icon-256.png",
         "icon_256x256@2x.png": "icon-512.png",
-        "icon_512x512.png":  "icon-512.png",
+        "icon_512x512.png": "icon-512.png",
         "icon_512x512@2x.png": "icon-1024.png",
     }
     for dst_name, src_name in mapping.items():