diff --git a/apps/api/services/workbook/conditions.py b/apps/api/services/workbook/conditions.py
index a0855330..5ca4d97a 100644
--- a/apps/api/services/workbook/conditions.py
+++ b/apps/api/services/workbook/conditions.py
@@ -11,6 +11,7 @@
   - {status} == "active"    → only run if status matches
   - {email} == "" AND {website} != ""  → compound conditions
   - {email} == "" OR {phone} == ""     → OR conditions
+  - AND binds before OR in mixed conditions (parentheses are not supported)
   - true / false / always / never      → literals
 
 Column config example:
@@ -60,15 +61,12 @@ def evaluate_condition(
     values = _get_values(row_cells, columns_config)
 
     # Parse syntax before resolving cells so their contents remain operand data.
-    parts = _split_unquoted(condition, r" AND ")
-    if len(parts) > 1:
-        return all(_eval_single(p.strip(), values) for p in parts)
-
-    parts = _split_unquoted(condition, r" OR ")
-    if len(parts) > 1:
-        return any(_eval_single(p.strip(), values) for p in parts)
-
-    return _eval_single(condition, values)
+    # OR separates conjunctions: AND binds more tightly. Keep both passes on
+    # authored syntax so operators inside literals or cell data stay data.
+    return any(
+        all(_eval_single(part.strip(), values) for part in _split_unquoted(group, r" AND "))
+        for group in _split_unquoted(condition, r" OR ")
+    )
 
 
 def _split_unquoted(expr: str, pattern: str, maxsplit: int = 0, flags: int = 0) -> list[str]:
diff --git a/tests/test_workbook_condition_precedence.py b/tests/test_workbook_condition_precedence.py
new file mode 100644
index 00000000..8ba4145a
--- /dev/null
+++ b/tests/test_workbook_condition_precedence.py
@@ -0,0 +1,28 @@
+"""Mixed column conditions use AND precedence over OR."""
+
+import itertools
+
+import pytest
+
+from apps.api.services.workbook.conditions import evaluate_condition
+
+
+@pytest.mark.parametrize("a,b,c", list(itertools.product([False, True], repeat=3)))
+@pytest.mark.parametrize("expression,order", [
+    ('{a} == "yes" OR {b} == "yes" AND {c} == "yes"', "or-and"),
+    ('{a} == "yes" AND {b} == "yes" OR {c} == "yes"', "and-or"),
+])
+def test_mixed_conditions_follow_boolean_truth_table(a, b, c, expression, order):
+    cells = {key: {"value": "yes" if value else "no"} for key, value in zip("abc", (a, b, c))}
+    expected = (a or (b and c)) if order == "or-and" else ((a and b) or c)
+    assert evaluate_condition(expression, cells, []) is expected
+
+
+def test_mixed_conditions_keep_operator_text_inside_literals_and_cells():
+    cells = {"name": {"value": "Sales OR Marketing AND Research"}, "score": {"value": 10}}
+    assert evaluate_condition(
+        '{name} == "Sales OR Marketing AND Research" OR {score} > 20 AND {score} < 0', cells, []
+    )
+    assert not evaluate_condition(
+        '{name} == "Other" OR {score} > 20 AND {name} == "Sales OR Marketing AND Research"', cells, []
+    )