diff --git a/app/api/fund.js b/app/api/fund.js
index e58053b..9640ffa 100644
--- a/app/api/fund.js
+++ b/app/api/fund.js
@@ -779,20 +779,29 @@ export const fetchFundHistory = async (code, range = '1m') => {
 
     if (Array.isArray(trend) && trend.length) {
       const startMs = start.startOf('day').valueOf();
-      // end 可能是当日任意时刻，这里用 end-of-day 包含最后一天
       const endMs = end.endOf('day').valueOf();
 
-      const out = trend
-        .filter((d) => d && typeof d.x === 'number' && d.x >= startMs && d.x <= endMs)
+      // 若起始日没有净值，则往前推到最近一日有净值的数据作为有效起始
+      const validTrend = trend
+        .filter((d) => d && typeof d.x === 'number' && Number.isFinite(Number(d.y)) && d.x <= endMs)
+        .sort((a, b) => a.x - b.x);
+      const startDayEndMs = startMs + 24 * 60 * 60 * 1000 - 1;
+      const hasPointOnStartDay = validTrend.some((d) => d.x >= startMs && d.x <= startDayEndMs);
+      let effectiveStartMs = startMs;
+      if (!hasPointOnStartDay) {
+        const lastBeforeStart = validTrend.filter((d) => d.x < startMs).pop();
+        if (lastBeforeStart) effectiveStartMs = lastBeforeStart.x;
+      }
+
+      const out = validTrend
+        .filter((d) => d.x >= effectiveStartMs && d.x <= endMs)
         .map((d) => {
           const value = Number(d.y);
-          if (!Number.isFinite(value)) return null;
           const date = dayjs(d.x).tz(TZ).format('YYYY-MM-DD');
           return { date, value };
-        })
-        .filter(Boolean);
+        });
 
-      // 解析 Data_grandTotal 为多条对比曲线，保存在数组属性 out.grandTotalSeries 上
+      // 解析 Data_grandTotal 为多条对比曲线，使用同一有效起始日
       if (Array.isArray(grandTotal) && grandTotal.length) {
         const grandTotalSeries = grandTotal
           .map((series) => {
@@ -801,7 +810,7 @@ export const fetchFundHistory = async (code, range = '1m') => {
             const points = series.data
               .filter((item) => Array.isArray(item) && typeof item[0] === 'number')
               .map(([ts, val]) => {
-                if (ts < startMs || ts > endMs) return null;
+                if (ts < effectiveStartMs || ts > endMs) return null;
                 const numVal = Number(val);
                 if (!Number.isFinite(numVal)) return null;
                 const date = dayjs(ts).tz(TZ).format('YYYY-MM-DD');
@@ -814,7 +823,6 @@ export const fetchFundHistory = async (code, range = '1m') => {
           .filter(Boolean);
 
         if (grandTotalSeries.length) {
-          // 给数组挂一个属性，供前端图表组件读取
           out.grandTotalSeries = grandTotalSeries;
         }
       }
diff --git a/app/components/FundTrendChart.jsx b/app/components/FundTrendChart.jsx
index d3b0ee3..9941353 100644
--- a/app/components/FundTrendChart.jsx
+++ b/app/components/FundTrendChart.jsx
@@ -62,9 +62,14 @@ export default function FundTrendChart({ code, isExpanded, onToggleExpand, trans
   const [error, setError] = useState(null);
   const chartRef = useRef(null);
   const hoverTimeoutRef = useRef(null);
+  const clearActiveIndexRef = useRef(null);
   const [hiddenGrandSeries, setHiddenGrandSeries] = useState(() => new Set());
   const [activeIndex, setActiveIndex] = useState(null);
 
+  useEffect(() => {
+    clearActiveIndexRef.current = () => setActiveIndex(null);
+  });
+
   const chartColors = useMemo(() => getChartThemeColors(theme), [theme]);
 
   useEffect(() => {
@@ -161,8 +166,11 @@ export default function FundTrendChart({ code, isExpanded, onToggleExpand, trans
       grandAccent3,
       chartColors.text,
     ];
-    const grandDatasets = grandTotalSeries.map((series, idx) => {
-      const color = grandColors[idx % grandColors.length];
+    // 隐藏第一条对比线（数据与图示）；第二条用原第一条颜色，第三条用原第二条，顺延
+    const visibleGrandSeries = grandTotalSeries.filter((_, idx) => idx > 0);
+    const grandDatasets = visibleGrandSeries.map((series, displayIdx) => {
+      const color = grandColors[displayIdx % grandColors.length];
+      const idx = displayIdx + 1; // 原始索引，用于 hiddenGrandSeries 的 key
       const key = `${series.name || 'series'}_${idx}`;
       const isHidden = hiddenGrandSeries.has(key);
       const pointsByDate = new Map(series.points.map(p => [p.date, p.value]));
@@ -374,6 +382,7 @@ export default function FundTrendChart({ code, isExpanded, onToggleExpand, trans
             chart.tooltip.setActiveElements([], { x: 0, y: 0 });
           }
           chart.update();
+          clearActiveIndexRef.current?.();
         }, 2000);
       }
     },
@@ -606,17 +615,19 @@ export default function FundTrendChart({ code, isExpanded, onToggleExpand, trans
           )}
         </div>
         {Array.isArray(data.grandTotalSeries) &&
-          data.grandTotalSeries.map((series, idx) => {
-            // 与折线数据使用同一套对比色，且排除红/绿
-            const legendAccent3 = theme === 'light' ? '#f97316' : '#fb923c';
-            const legendColors = [
-              primaryColor,
-              chartColors.muted,
-              legendAccent3,
-              chartColors.text,
-            ];
-            const color = legendColors[idx % legendColors.length];
-            const key = `${series.name || 'series'}_${idx}`;
+          data.grandTotalSeries
+            .filter((_, idx) => idx > 0)
+            .map((series, displayIdx) => {
+              const idx = displayIdx + 1;
+              const legendAccent3 = theme === 'light' ? '#f97316' : '#fb923c';
+              const legendColors = [
+                primaryColor,
+                chartColors.muted,
+                legendAccent3,
+                chartColors.text,
+              ];
+              const color = legendColors[displayIdx % legendColors.length];
+              const key = `${series.name || 'series'}_${idx}`;
             const isHidden = hiddenGrandSeries.has(key);
             let valueText = '--';
             if (!isHidden && currentIndex != null && data[currentIndex]) {