diff --git a/client/src/pdd_u2_purchase_adapter.py b/client/src/pdd_u2_purchase_adapter.py
index 3e4c1bc..b613727 100644
--- a/client/src/pdd_u2_purchase_adapter.py
+++ b/client/src/pdd_u2_purchase_adapter.py
@@ -49,7 +49,11 @@ from .pdd_purchase_adapter import (
     PurchasePageState,
 )
 from .util.get_size_panle_coord import get_size_panel_coord
-from .util.select_color_size import select_color, select_size
+from .util.select_color_size import (
+    color_selection_failure_reason,
+    select_color,
+    select_size,
+)
 
 
 Bounds = tuple[int, int, int, int]
@@ -734,10 +738,32 @@ class U2PddPurchaseAdapter(PddPurchaseAdapter):
                         device, panel_xml, color, action_delay=0.2
                     )
                 if not color_selected:
+                    failed_xml = self._dump_hierarchy()
+                    failure_reason = color_selection_failure_reason(
+                        failed_xml, color
+                    )
+                    diagnostics: dict[str, Any] = {
+                        "selection_failure": failure_reason,
+                    }
+                    artifact = self._save_last_xml(
+                        "purchase-color-selection-mismatch"
+                    )
+                    if artifact is not None:
+                        diagnostics["artifacts"] = [artifact]
+                    messages = {
+                        "target_not_visible": f"没有找到目标颜色：{color}",
+                        "safe_target_missing": (
+                            f"目标颜色没有完整可见的安全点击位置：{color}"
+                        ),
+                        "selection_unconfirmed": (
+                            f"点击颜色后页面没有确认已选中：{color}"
+                        ),
+                    }
                     raise PddPurchaseError(
                         "PURCHASE_OPTIONS_MISMATCH",
-                        f"没有精确选中颜色：{color}",
+                        messages[failure_reason],
                         step="purchase_select_options",
+                        diagnostics=diagnostics,
                     )
             size = checked.get("size")
             if size:
diff --git a/client/src/util/select_color_size.py b/client/src/util/select_color_size.py
index b5e9864..9d0daf9 100644
--- a/client/src/util/select_color_size.py
+++ b/client/src/util/select_color_size.py
@@ -173,9 +173,16 @@ def _horizontal_color_region(
     if candidates:
         return max(candidates, key=lambda item: item[0])[1]
 
-    # 部分自绘横向列表不会暴露 scrollable，使用颜色标题下方区域兜底。
+    # 部分自绘列表不会暴露 scrollable。目标已经出现时，用完整卡片和
+    # 下一规格标题确定纵向边界，避免固定高度截断较高的图片卡片。
     if heading is None or screen is None:
         return None
+    if target:
+        target_region = _non_scrollable_target_region(
+            root, target, heading, screen
+        )
+        if target_region is not None:
+            return target_region
 
     top = heading[3]
     bottom = min(screen[3], top + max(160, int(screen[3] * 0.14)))
@@ -184,6 +191,51 @@ def _horizontal_color_region(
     return int(screen[2] * 0.04), top, int(screen[2] * 0.96), bottom
 
 
+def _non_scrollable_target_region(
+    root: ET.Element,
+    target: str,
+    heading: Bounds,
+    screen: Bounds,
+) -> Optional[Bounds]:
+    """用目标卡片和下一规格标题界定非滚动颜色区域。"""
+
+    parents = _parent_map(root)
+    target_bounds = [
+        bounds
+        for node in root.iter("node")
+        if _is_available(node) and _matches_target(node, target)
+        if (bounds := _nearest_click_bounds(node, parents, screen)) is not None
+        if bounds[1] >= heading[3]
+    ]
+    if not target_bounds:
+        return None
+
+    card = max(
+        target_bounds,
+        key=lambda item: (item[2] - item[0]) * (item[3] - item[1]),
+    )
+    next_heading_tops = []
+    for node in root.iter("node"):
+        text = re.sub(
+            r"[（(]\s*\d+\s*[)）]\s*$",
+            "",
+            node.get("text", "").replace(" ", ""),
+        )
+        bounds = _parse_bounds(node.get("bounds", ""))
+        if (
+            text in ("尺码", "套餐")
+            and node.get("clickable") != "true"
+            and bounds is not None
+            and bounds[1] > heading[3]
+        ):
+            next_heading_tops.append(bounds[1])
+
+    bottom = min(next_heading_tops) if next_heading_tops else card[3]
+    if card[3] > bottom or bottom <= heading[3]:
+        return None
+    return screen[0], heading[3], screen[2], bottom
+
+
 def _vertical_panel_region(root: ET.Element) -> Optional[Bounds]:
     heading = _heading_bounds(root)
     vertical: list[tuple[float, Bounds]] = []
@@ -327,6 +379,28 @@ def _target_is_selected(root: ET.Element, target: str) -> bool:
     return False
 
 
+def color_selection_failure_reason(xml_data: XmlData, target: str) -> str:
+    """说明颜色选择失败阶段，供采购 Adapter 生成准确诊断。"""
+
+    root = _parse_xml(xml_data)
+    matching_nodes = [
+        node
+        for node in root.iter("node")
+        if _is_available(node) and _matches_target(node, target)
+    ]
+    if not matching_nodes:
+        return "target_not_visible"
+    region = _horizontal_color_region(root, target)
+    if region is None or _target_click_bounds(
+        root,
+        target,
+        region,
+        require_horizontal_safe=True,
+    ) is None:
+        return "safe_target_missing"
+    return "selection_unconfirmed"
+
+
 def _visible_signature(
     root: ET.Element,
     region: Bounds,
@@ -439,6 +513,10 @@ def select_color(
         raise ValueError("target_color 不能为空")
 
     root = _parse_xml(xml_data)
+    target_is_static = (
+        _target_scrollable_ancestor(root, target_color) is None
+        and any(_matches_target(node, target_color) for node in root.iter("node"))
+    )
     region = _horizontal_color_region(root, target_color)
     if region is None:
         return False
@@ -453,6 +531,10 @@ def select_color(
     )
     if selected:
         return True
+    if target_is_static:
+        # 静态面板中目标已经出现，点击失败后继续横向滑动只会增加等待，
+        # 还可能触碰其他控件；必须立即交给上层报告未确认。
+        return False
     region = _horizontal_color_region(root, target_color) or region
 
     # 当前横向位置未知：先用手指向右滑到列表左端。每次刷新 XML 时，
diff --git a/client/test/test_pdd_u2_purchase_adapter.py b/client/test/test_pdd_u2_purchase_adapter.py
index 2d23a9e..4837081 100644
--- a/client/test/test_pdd_u2_purchase_adapter.py
+++ b/client/test/test_pdd_u2_purchase_adapter.py
@@ -240,6 +240,21 @@ class ContextualConfirmPanelDevice(FakeDevice):
         self.mode = "panel"
 
 
+class SubmitHintPanelDevice(FakeDevice):
+    """模拟带提交提示的非滚动图片颜色面板。"""
+
+    def __init__(self, panel_data: str) -> None:
+        super().__init__()
+        self.panel_data = panel_data
+
+    def dump_hierarchy(self):
+        if not self.has_opened:
+            return '<hierarchy><node package="com.xunmeng.pinduoduo" /></hierarchy>'
+        if self.mode == "panel":
+            return self.panel_data
+        return home_xml()
+
+
 def address_confirmation_xml(address: str) -> str:
     return f"""<hierarchy>
       <node package="com.xunmeng.pinduoduo" bounds="[0,0][1080,2376]">
@@ -827,6 +842,40 @@ class U2PddPurchaseAdapterTest(unittest.TestCase):
             self.assertIn("[已脱敏]", content)
         adapter.close()
 
+    def test_color_mismatch_reports_reason_and_saves_sanitized_tree(self):
+        panel_data = (
+            FIXTURES / "pdd_spec_panel_submit_hint.xml"
+        ).read_text(encoding="utf-8")
+        device = SubmitHintPanelDevice(panel_data)
+        with tempfile.TemporaryDirectory() as directory:
+            adapter = U2PddPurchaseAdapter(
+                "USB-001",
+                device_service=PddDeviceService(
+                    connector=lambda _serial: device
+                ),
+                sleeper=lambda _seconds: None,
+                select_color_fn=lambda *_args, **_kwargs: False,
+                artifact_directory=Path(directory),
+            )
+            adapter.open_goods(GOODS_URL)
+
+            with self.assertRaises(PddPurchaseError) as raised:
+                adapter.select_options({"color": "测试黑色"})
+
+            self.assertEqual(
+                raised.exception.code, "PURCHASE_OPTIONS_MISMATCH"
+            )
+            self.assertIn("点击颜色后", raised.exception.message)
+            self.assertEqual(
+                raised.exception.diagnostics["selection_failure"],
+                "selection_unconfirmed",
+            )
+            artifact = raised.exception.diagnostics["artifacts"][0]
+            content = Path(artifact["path"]).read_text(encoding="utf-8")
+            self.assertNotIn("测试黑色", content)
+            self.assertIn("[已脱敏]", content)
+            adapter.close()
+
     def test_invalid_non_pdd_url_is_rejected_before_connect(self):
         device = FakeDevice()
         adapter = self._adapter(device, [])
diff --git a/client/test/test_select_color_size.py b/client/test/test_select_color_size.py
new file mode 100644
index 0000000..3622831
--- /dev/null
+++ b/client/test/test_select_color_size.py
@@ -0,0 +1,127 @@
+"""采购规格颜色选择测试；只使用脱敏 XML，不连接真机。"""
+
+from pathlib import Path
+import unittest
+import xml.etree.ElementTree as ET
+
+from src.util.select_color_size import (
+    color_selection_failure_reason,
+    select_color,
+)
+
+
+FIXTURES = Path(__file__).parent / "fixtures"
+
+
+class StaticColorDevice:
+    """模拟没有滚动属性的图片颜色规格面板。"""
+
+    def __init__(self, xml_data: str, confirm_selection: bool = True) -> None:
+        self.xml_data = xml_data
+        self.confirm_selection = confirm_selection
+        self.clicks = []
+        self.swipes = []
+
+    def dump_hierarchy(self) -> str:
+        return self.xml_data
+
+    def click(self, x: int, y: int) -> None:
+        self.clicks.append((x, y))
+        if not self.confirm_selection:
+            return
+        root = ET.fromstring(self.xml_data)
+        for node in root.iter("node"):
+            if node.get("text", "").strip() == "测试黑色":
+                node.set("selected", "true")
+            if node.get("text", "").strip().startswith("请选择"):
+                node.set("text", "已选： 测试黑色")
+        self.xml_data = ET.tostring(root, encoding="unicode")
+
+    def swipe(self, *args, **kwargs) -> None:
+        self.swipes.append((args, kwargs))
+
+
+class StaticColorSelectionTest(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        cls.panel_xml = (
+            FIXTURES / "pdd_spec_panel_submit_hint.xml"
+        ).read_text(encoding="utf-8")
+
+    def test_tall_static_color_card_is_clicked_and_confirmed(self):
+        device = StaticColorDevice(self.panel_xml)
+
+        selected = select_color(
+            device,
+            self.panel_xml,
+            "测试黑色",
+            action_delay=0.001,
+        )
+
+        self.assertTrue(selected)
+        self.assertEqual(device.clicks, [(194, 1389)])
+        self.assertEqual(device.swipes, [])
+
+    def test_static_card_stops_when_click_is_not_confirmed(self):
+        device = StaticColorDevice(self.panel_xml, confirm_selection=False)
+
+        selected = select_color(
+            device,
+            self.panel_xml,
+            "测试黑色",
+            action_delay=0.001,
+        )
+
+        self.assertFalse(selected)
+        self.assertEqual(device.clicks, [(194, 1389)])
+        self.assertEqual(device.swipes, [])
+        self.assertEqual(
+            color_selection_failure_reason(
+                device.dump_hierarchy(), "测试黑色"
+            ),
+            "selection_unconfirmed",
+        )
+
+    def test_partially_visible_static_card_is_not_clicked(self):
+        partial_xml = self.panel_xml.replace(
+            "[36,1188][352,1591]", "[0,1188][60,1591]"
+        ).replace(
+            "[36,1188][352,1504]", "[0,1188][60,1504]"
+        ).replace(
+            "[36,1483][352,1591]", "[0,1483][60,1591]"
+        )
+        device = StaticColorDevice(partial_xml)
+
+        selected = select_color(
+            device, partial_xml, "测试黑色", action_delay=0.001
+        )
+
+        self.assertFalse(selected)
+        self.assertEqual(device.clicks, [])
+        self.assertEqual(device.swipes, [])
+        self.assertEqual(
+            color_selection_failure_reason(partial_xml, "测试黑色"),
+            "safe_target_missing",
+        )
+
+    def test_card_crossing_size_heading_is_not_clicked(self):
+        crossing_xml = self.panel_xml.replace(
+            "[36,1188][352,1591]", "[36,1188][352,1700]"
+        ).replace(
+            "[36,1188][352,1504]", "[36,1188][352,1660]"
+        ).replace(
+            "[36,1483][352,1591]", "[36,1592][352,1700]"
+        )
+        device = StaticColorDevice(crossing_xml)
+
+        selected = select_color(
+            device, crossing_xml, "测试黑色", action_delay=0.001
+        )
+
+        self.assertFalse(selected)
+        self.assertEqual(device.clicks, [])
+        self.assertEqual(device.swipes, [])
+
+
+if __name__ == "__main__":
+    unittest.main()