diff --git a/src/pdf_filler.py b/src/pdf_filler.py
index b5f63a4..2ca82da 100644
--- a/src/pdf_filler.py
+++ b/src/pdf_filler.py
@@ -11,7 +11,7 @@ from pathlib import Path
 from typing import Any, Dict, Optional
 
 from pypdf import PdfReader, PdfWriter
-from pypdf.generic import BooleanObject, NameObject, NumberObject
+from pypdf.generic import BooleanObject, NameObject, NumberObject, TextStringObject
 
 from .config_loader import load_config
 from .exceptions import PdfTemplateError
@@ -99,9 +99,17 @@ def _update_widget_visibility(writer: PdfWriter, fields: Dict[str, str]) -> None
     hidden bit at runtime when ``anwesend.N`` is selected.  Because we write
     values directly without executing JavaScript we must clear the hidden bit
     ourselves for every row where a value is present.
+
+    Also patches the Default Appearance (/DA) of summary fields: the template
+    uses ``1 g`` (white fill color) because JavaScript normally writes the /AP.
+    With NeedAppearances=True pymupdf regenerates /AP from /DA — white text on
+    a white background is invisible.  Replace ``1 g`` with ``0 g`` (black) so
+    the regenerated text is visible.
     """
     HIDDEN_FIELD_PREFIXES = ("ist.", "plan.")
     HIDDEN_BIT = 2  # PDF annotation flag bit 2 = Hidden
+    # Summary fields whose /DA may use white text (1 g); patch to black (0 g).
+    SUM_FIELDS = {"anwesend_sum", "pauschale_5_sum", "pauschale_25_sum", "pauschale_sum"}
 
     for page in writer.pages:
         annots = page.get("/Annots")
@@ -117,15 +125,20 @@ def _update_widget_visibility(writer: PdfWriter, fields: Dict[str, str]) -> None
             else:
                 full_name = t
 
-            if not any(full_name.startswith(p) for p in HIDDEN_FIELD_PREFIXES):
-                continue
+            # --- Hidden-bit fix for ist.N / plan.N ---
+            if any(full_name.startswith(p) for p in HIDDEN_FIELD_PREFIXES):
+                has_value = bool(fields.get(full_name, ""))
+                current_f = int(annot.get("/F", 4))
+                # Remove hidden bit when value present, keep/set it when absent
+                new_f = (current_f & ~HIDDEN_BIT) if has_value else (current_f | HIDDEN_BIT)
+                if new_f != current_f:
+                    annot[NameObject("/F")] = NumberObject(new_f)
 
-            has_value = bool(fields.get(full_name, ""))
-            current_f = int(annot.get("/F", 4))
-            # Remove hidden bit when value present, keep/set it when absent
-            new_f = (current_f & ~HIDDEN_BIT) if has_value else (current_f | HIDDEN_BIT)
-            if new_f != current_f:
-                annot[NameObject("/F")] = NumberObject(new_f)
+            # --- /DA color fix for summary fields ---
+            if full_name in SUM_FIELDS:
+                da = str(annot.get("/DA", ""))
+                if da and "1 g" in da:
+                    annot[NameObject("/DA")] = TextStringObject(da.replace("1 g", "0 g"))
 
 
 def fill_pdf(