diff --git a/web/_gen_icons.py b/web/_gen_icons.py
new file mode 100644
index 0000000..44ae089
--- /dev/null
+++ b/web/_gen_icons.py
@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+"""Generiert die PWA-Icons (icon-192/512.png): weißes Umschlag-Logo auf blauem
+Verlauf. Reproduzierbar — bei Logo-Änderungen einfach neu laufen lassen.
+
+    python3 web/_gen_icons.py
+"""
+from PIL import Image, ImageDraw
+
+SS = 4  # Supersampling-Faktor für weiche Kanten
+GRAD_TL = (91, 155, 255)   # #5b9bff  oben links
+GRAD_BR = (26, 63, 176)    # #1a3fb0  unten rechts
+INK = (255, 255, 255, 255)  # Umschlag in Weiß
+
+# Logo im 48er-Koordinatensystem (identisch zu favicon.svg / Homepage-SVG)
+VB = 48.0
+LOGO_CX, LOGO_CY = 24.0, 24.75      # Mittelpunkt der Logo-Bounding-Box
+LOGO_W = 34.0                        # Breite der Bounding-Box
+FILL_FRAC = 0.60                     # Logo füllt 60 % der Icon-Breite (Maskable-safe)
+
+
+def diagonal_gradient(size):
+    g = Image.new("RGB", (64, 64))
+    px = g.load()
+    for y in range(64):
+        for x in range(64):
+            t = (x + y) / 126.0
+            px[x, y] = tuple(round(a + (b - a) * t) for a, b in zip(GRAD_TL, GRAD_BR))
+    return g.resize((size, size), Image.BILINEAR)
+
+
+def render(size):
+    W = size * SS
+    img = diagonal_gradient(W).convert("RGBA")
+    d = ImageDraw.Draw(img)
+
+    scale = (FILL_FRAC * W) / LOGO_W          # px pro viewBox-Einheit
+    cx = cy = W / 2.0
+
+    def T(vx, vy):                            # viewBox -> Pixel (zentriert)
+        return (cx + (vx - LOGO_CX) * scale, cy + (vy - LOGO_CY) * scale)
+
+    sw = max(1, round(3.0 * scale))           # Strichstärke
+    r = 4.5 * scale                           # Eckenradius Umschlag
+
+    # Umschlag-Körper (abgerundetes Rechteck)
+    x0, y0 = T(7, 16); x1, y1 = T(41, 40)
+    d.rounded_rectangle([x0, y0, x1, y1], radius=r, outline=INK, width=sw)
+    # Klappe (V)
+    d.line([T(8, 18.5), T(24, 31), T(40, 18.5)], fill=INK, width=sw, joint="curve")
+    # Kapuze (oberer Ellipsenbogen)
+    ax0, ay0 = T(17, 9.5); ax1, ay1 = T(31, 22.5)
+    d.arc([ax0, ay0, ax1, ay1], start=180, end=360, fill=INK, width=sw)
+
+    return img.resize((size, size), Image.LANCZOS)
+
+
+for s in (192, 512):
+    render(s).save(f"web/icon-{s}.png")
+    print(f"web/icon-{s}.png geschrieben")
diff --git a/web/icon-192.png b/web/icon-192.png
index 90f0ed0..02ef889 100644
Binary files a/web/icon-192.png and b/web/icon-192.png differ
diff --git a/web/icon-512.png b/web/icon-512.png
index d010948..c8f7705 100644
Binary files a/web/icon-512.png and b/web/icon-512.png differ