diff --git a/frontends/desktop_pet_v2.pyw b/frontends/desktop_pet_v2.pyw
index 1977758..0f082a7 100644
--- a/frontends/desktop_pet_v2.pyw
+++ b/frontends/desktop_pet_v2.pyw
@@ -73,18 +73,6 @@ class AnimationLoader:
         return frames
 
 
-def _find_bubble_asset():
-    """Find user-provided bubble asset in project root."""
-    candidates = [
-        os.path.join(PROJECT_DIR, '聊天气泡.png'),
-        os.path.join(PROJECT_DIR, 'bubble.png'),
-    ]
-    for path in candidates:
-        if os.path.exists(path):
-            return path
-    return None
-
-
 def _load_default_font(size):
     """Load a usable font for bubble text."""
     font_candidates = [
@@ -149,9 +137,11 @@ def _wrap_text_for_width(draw, text, font, max_width):
 def build_bubble_image(message, max_width=220):
     """Build a PIL image for the toast bubble using the user asset when available."""
     message = (message or '').strip()
-    bubble_path = _find_bubble_asset()
+    bubble_path = next((p for p in [os.path.join(PROJECT_DIR, '聊天气泡.png'),
+                                     os.path.join(PROJECT_DIR, 'bubble.png')]
+                        if os.path.exists(p)), None)
 
-    if bubble_path and os.path.exists(bubble_path):
+    if bubble_path:
         bubble = Image.open(bubble_path).convert('RGBA')
     else:
         bubble = Image.new('RGBA', (256, 128), (255, 255, 255, 0))
@@ -161,20 +151,31 @@ def build_bubble_image(message, max_width=220):
 
     bubble = ImageOps.contain(bubble, (max_width, max(64, int(max_width * bubble.height / bubble.width))), Image.NEAREST)
 
-    font_size = max(12, bubble.height // 7)
+    # Detect the actual opaque bubble region to position text correctly
+    alpha = bubble.getchannel('A')
+    content_box = alpha.getbbox()  # (left, top, right, bottom) of opaque area
+    if content_box:
+        cb_left, cb_top, cb_right, cb_bottom = content_box
+    else:
+        cb_left, cb_top, cb_right, cb_bottom = 0, 0, bubble.width, bubble.height
+    content_w = cb_right - cb_left
+    content_h = cb_bottom - cb_top
+
+    font_size = max(12, content_h // 6)
     font = _load_default_font(font_size)
     draw = ImageDraw.Draw(bubble)
 
-    pad_left = max(12, bubble.width // 16)
-    pad_right = max(16, bubble.width // 10)
-    pad_top = max(8, bubble.height // 10)
-    pad_bottom = max(20, bubble.height // 3)
-    text_area_width = max(36, bubble.width - pad_left - pad_right)
+    # Padding relative to the opaque bubble region, not the full image
+    inner_pad_x = max(6, content_w // 14)
+    inner_pad_top = max(4, content_h // 12)
+    inner_pad_bottom = max(12, content_h // 4)
+    text_area_width = max(36, content_w - inner_pad_x * 2)
 
     lines = _wrap_text_for_width(draw, message, font, text_area_width)
     ascent, descent = font.getmetrics() if hasattr(font, 'getmetrics') else (font_size, font_size // 4)
     line_height = max(font_size, ascent + descent)
-    max_lines = max(1, (bubble.height - pad_top - pad_bottom) // line_height)
+    usable_h = content_h - inner_pad_top - inner_pad_bottom
+    max_lines = max(1, usable_h // line_height)
     if len(lines) > max_lines:
         lines = lines[:max_lines]
         if lines:
@@ -184,12 +185,12 @@ def build_bubble_image(message, max_width=220):
             lines[-1] = (last + '…') if last else '…'
 
     total_text_height = len(lines) * line_height
-    y = pad_top + max(0, (bubble.height - pad_top - pad_bottom - total_text_height) // 2)
+    y = cb_top + inner_pad_top + max(0, (usable_h - total_text_height) // 2) - 3
 
     for line in lines:
         bbox = draw.textbbox((0, 0), line, font=font)
         text_width = bbox[2] - bbox[0]
-        x = pad_left + (text_area_width - text_width) / 2
+        x = cb_left + inner_pad_x + (text_area_width - text_width) / 2
         draw.text((x, y), line, font=font, fill=(32, 32, 32, 255))
         y += line_height
 
@@ -461,10 +462,6 @@ if sys.platform == 'darwin':
                 # Convert to NSImage with proper alpha handling
                 ns_images = []
                 for pil_img in scaled_frames:
-                    # Ensure RGBA mode for transparency
-                    if pil_img.mode != 'RGBA':
-                        pil_img = pil_img.convert('RGBA')
-
                     # Convert PIL to PNG bytes (PNG preserves alpha channel)
                     png_buffer = io.BytesIO()
                     pil_img.save(png_buffer, format='PNG')
@@ -513,10 +510,6 @@ if sys.platform == 'darwin':
             """Show toast message above pet"""
             from AppKit import NSImageView
 
-            with open('/tmp/pet_toast_debug.log', 'a') as f:
-                f.write(f"[DEBUG] show_toast called with: {message}\n")
-                f.flush()
-
             if self.toast_window:
                 self.toast_window.orderOut_(None)
                 self.toast_window = None
@@ -562,10 +555,6 @@ if sys.platform == 'darwin':
             self.toast_window.setContentView_(self.toast_label)
             self.toast_window.orderFrontRegardless()
 
-            with open('/tmp/pet_toast_debug.log', 'a') as f:
-                f.write(f"[DEBUG] Toast window shown at ({toast_x}, {toast_y}) size={bubble_info['size']} tail={bubble_info['tail_tip']}\n")
-                f.flush()
-
             self.toast_timer = NSTimer.scheduledTimerWithTimeInterval_target_selector_userInfo_repeats_(
                 3.0,
                 self,
diff --git a/聊天气泡.png b/聊天气泡.png
new file mode 100644
index 0000000..c1969df
Binary files /dev/null and b/聊天气泡.png differ