趋势图逻辑改动

lib/pages/battery_health_page.dart

@@ -1035,17 +1035,18 @@ class _BatteryHealthPageState extends State<BatteryHealthPage>
                             crossAxisAlignment: CrossAxisAlignment.end,
                             children: List.generate(percents.length, (index) {
                               double value = percents[index];
-                              Color barColor;
-                              if (value > 0) {
-                                if (value >= 80)
+Color barColor;
+if (value > 0) {
+  if (value >= 80) {
     barColor = kHealthGreen;
-                                else if (value >= 60)
+  } else if (value >= 70) {
     barColor = kHealthYellow;
-                                else
-                                  barColor = kHealthOrange;
   } else {
-                                barColor = Colors.grey.shade300;
+    barColor = Colors.red; // 🟢 小于 70 显示红色
   }
+} else {
+  barColor = Colors.grey.shade300;
+}
                               double clampedValue = value.clamp(70.0, 100.0);
                               double heightFactor =
                                   (clampedValue - 70.0) / 30.0;