diff --git a/harbour-calibreweb.pro b/harbour-calibreweb.pro
index 7a5b444..cc92968 100644
--- a/harbour-calibreweb.pro
+++ b/harbour-calibreweb.pro
@@ -44,4 +44,8 @@ icons86.path = /usr/share/icons/hicolor/86x86/apps
 icons86.files = $$PWD/icons/86x86/harbour-calibreweb.png
 icons108.path = /usr/share/icons/hicolor/108x108/apps
 icons108.files = $$PWD/icons/108x108/harbour-calibreweb.png
-INSTALLS += icons86 icons108
+icons128.path = /usr/share/icons/hicolor/128x128/apps
+icons128.files = $$PWD/icons/128x128/harbour-calibreweb.png
+icons172.path = /usr/share/icons/hicolor/172x172/apps
+icons172.files = $$PWD/icons/172x172/harbour-calibreweb.png
+INSTALLS += icons86 icons108 icons128 icons172
diff --git a/icons/108x108/harbour-calibreweb.png b/icons/108x108/harbour-calibreweb.png
index 52581d1..5e9799b 100644
Binary files a/icons/108x108/harbour-calibreweb.png and b/icons/108x108/harbour-calibreweb.png differ
diff --git a/icons/128x128/harbour-calibreweb.png b/icons/128x128/harbour-calibreweb.png
new file mode 100644
index 0000000..85a5fe2
Binary files /dev/null and b/icons/128x128/harbour-calibreweb.png differ
diff --git a/icons/172x172/harbour-calibreweb.png b/icons/172x172/harbour-calibreweb.png
new file mode 100644
index 0000000..90c4e4e
Binary files /dev/null and b/icons/172x172/harbour-calibreweb.png differ
diff --git a/icons/86x86/harbour-calibreweb.png b/icons/86x86/harbour-calibreweb.png
index f08f3d0..3705822 100644
Binary files a/icons/86x86/harbour-calibreweb.png and b/icons/86x86/harbour-calibreweb.png differ
diff --git a/icons/make_icons.py b/icons/make_icons.py
index 5aeec93..325b233 100644
--- a/icons/make_icons.py
+++ b/icons/make_icons.py
@@ -1,53 +1,86 @@
 #!/usr/bin/env python3
-"""Genera le icone dell'app nella struttura standard Sailfish:
-   icons/86x86/harbour-calibreweb.png e icons/108x108/harbour-calibreweb.png"""
+"""Genera le icone dell'app in stile Sailfish OS:
+   sfondo a gradiente azzurro->blu con angoli molto arrotondati,
+   libro aperto bianco con ombra morbida e righe di testo tenui.
+   Dimensioni: 86, 108, 128, 172 (struttura standard hicolor)."""
 import os
 from PIL import Image, ImageDraw
 
-BG = (46, 52, 64)          # #2E3440
-ACCENT = (136, 192, 208)   # #88C0D0
-PAGE = (229, 233, 240)     # #E5E9F0
-SPINE = (94, 129, 172)     # #5E81AC
+# gradiente Sailfish: azzurro chiaro (alto) -> blu profondo (basso)
+C_TOP = (94, 210, 240)     # #5ED2F0
+C_BOT = (14, 111, 168)     # #0E6FA8
+PAGE = (255, 255, 255)
+TEXT = (120, 190, 225)     # righe del testo, tenue
+SPINE = (200, 225, 240)
 
 
-def draw_icon(size):
-    img = Image.new("RGBA", (size, size), (0, 0, 0, 0))
+def gradient(size, c1, c2):
+    img = Image.new("RGB", (size, size))
     d = ImageDraw.Draw(img)
-    margin = size * 0.045
-    radius = size * 0.16
-    d.rounded_rectangle([margin, margin, size - margin, size - margin],
-                        radius=radius, fill=BG)
-
-    cx = size / 2
-    top = size * 0.34
-    bot = size * 0.68
-    half = size * 0.16
-    outer_l = size * 0.22
-    outer_r = size * 0.78
-
-    left_page = [(cx - half, top), (cx, top), (cx, bot), (outer_l, bot + size * 0.04)]
-    right_page = [(cx, top), (cx + half, top), (outer_r, bot + size * 0.04), (cx, bot)]
-
-    d.polygon(left_page, fill=ACCENT)
-    d.polygon(right_page, fill=ACCENT)
-    d.rectangle([cx - size * 0.014, top, cx + size * 0.014, bot], fill=SPINE)
-
-    lw = max(1, int(size * 0.012))
-    for y_frac in (0.45, 0.52, 0.59):
-        y = size * y_frac
-        d.line([(cx - half + size * 0.03, y), (outer_l + size * 0.06, y + size * 0.025)],
-               fill=PAGE, width=lw)
-        d.line([(cx + half - size * 0.03, y), (outer_r - size * 0.06, y + size * 0.025)],
-               fill=PAGE, width=lw)
+    for y in range(size):
+        t = y / (size - 1)
+        d.line([(0, y), (size, y)],
+               fill=(int(c1[0] + (c2[0] - c1[0]) * t),
+                     int(c1[1] + (c2[1] - c1[1]) * t),
+                     int(c1[2] + (c2[2] - c1[2]) * t)))
     return img
 
 
+def draw_icon(size):
+    m = size * 0.05
+    r = size * 0.22
+    out = Image.new("RGBA", (size, size), (0, 0, 0, 0))
+
+    # sfondo: gradiente ritagliato nel rounded rect
+    grad = gradient(size, C_TOP, C_BOT).convert("RGBA")
+    mask = Image.new("L", (size, size), 0)
+    ImageDraw.Draw(mask).rounded_rectangle([m, m, size - m, size - m],
+                                           radius=r, fill=255)
+    out.paste(grad, (0, 0), mask)
+
+    d = ImageDraw.Draw(out)
+
+    cx = size / 2
+    top = size * 0.33
+    bot = size * 0.66
+    half = size * 0.15
+    ol = size * 0.24
+    orr = size * 0.76
+
+    def pages():
+        return ([(cx - half, top), (cx, top), (cx, bot), (ol, bot + size * 0.035)],
+                [(cx, top), (cx + half, top), (orr, bot + size * 0.035), (cx, bot)])
+
+    lp, rp = pages()
+    # ombra morbida sotto il libro (rilievo stile Sailfish)
+    sh = size * 0.022
+    shadow = Image.new("RGBA", (size, size), (0, 0, 0, 0))
+    ds = ImageDraw.Draw(shadow)
+    lps, rps = pages()
+    ds.polygon([(x, y + sh) for x, y in lps], fill=(0, 60, 100, 90))
+    ds.polygon([(x, y + sh) for x, y in rps], fill=(0, 60, 100, 90))
+    out.alpha_composite(shadow)
+
+    d.polygon(lp, fill=PAGE)
+    d.polygon(rp, fill=PAGE)
+    d.rectangle([cx - size * 0.016, top, cx + size * 0.016, bot], fill=SPINE)
+
+    # righe di testo sulle pagine
+    lw = max(1, int(size * 0.012))
+    for yf, dy in ((0.46, 0.022), (0.53, 0.026), (0.60, 0.030)):
+        y = size * yf
+        d.line([(cx - half + size * 0.045, y), (ol + size * 0.05, y + size * dy)],
+               fill=TEXT, width=lw)
+        d.line([(cx + half - size * 0.045, y), (orr - size * 0.05, y + size * dy)],
+               fill=TEXT, width=lw)
+    return out
+
+
 def main():
-    os.makedirs("icons/86x86", exist_ok=True)
-    os.makedirs("icons/108x108", exist_ok=True)
-    draw_icon(86).save("icons/86x86/harbour-calibreweb.png")
-    draw_icon(108).save("icons/108x108/harbour-calibreweb.png")
-    print("icone scritte in icons/86x86/ e icons/108x108/")
+    for s in (86, 108, 128, 172):
+        os.makedirs(f"icons/{s}x{s}", exist_ok=True)
+        draw_icon(s).save(f"icons/{s}x{s}/harbour-calibreweb.png")
+    print("icone scritte: 86, 108, 128, 172")
 
 
 if __name__ == "__main__":
diff --git a/rpm/harbour-calibreweb.spec b/rpm/harbour-calibreweb.spec
index 16b7540..d22ae37 100644
--- a/rpm/harbour-calibreweb.spec
+++ b/rpm/harbour-calibreweb.spec
@@ -90,5 +90,7 @@ install -m 0644 %{_builddir}/%{name}_it.qm %{buildroot}%{_datadir}/%{name}/trans
 %{_datadir}/applications/%{name}.desktop
 %{_datadir}/icons/hicolor/86x86/apps/%{name}.png
 %{_datadir}/icons/hicolor/108x108/apps/%{name}.png
+%{_datadir}/icons/hicolor/128x128/apps/%{name}.png
+%{_datadir}/icons/hicolor/172x172/apps/%{name}.png
 %{_datadir}/%{name}/qml
 %{_datadir}/%{name}/translations/%{name}*.qm