diff --git a/components/dashboard/network-timeline.tsx b/components/dashboard/network-timeline.tsx
index 3a2b768..52da35d 100644
--- a/components/dashboard/network-timeline.tsx
+++ b/components/dashboard/network-timeline.tsx
@@ -852,6 +852,10 @@ export function NetworkTimeline({
 
   // 智能时间格式化 - 提升用户体验
   function formatTime(ms: number): string {
+    // 统一兜底：避免负值/NaN 导致显示 "-Xs"
+    if (!Number.isFinite(ms) || ms <= 0) {
+      return '0s';
+    }
     if (ms < 1000) {
       return `${Math.round(ms)}ms`;
     }
@@ -983,8 +987,51 @@ export function NetworkTimeline({
     });
   }, []);
 
-  // 计算时间线位置
+  // 计算时间线位置（用于绘制可视化相对宽度）
   const maxTime = Math.max(...(filteredTaskExecutions.length > 0 ? filteredTaskExecutions.map((task: TaskExecution) => task.endTime) : [0]));
+
+  // 计算“项目总耗时”应独立于过滤条件，直接基于原始 tasks
+  // 规则：
+  // 1) 全局开始时间 = 所有任务 start_time/created_at 的最小值
+  // 2) 全局结束时间 =
+  //    - 若存在已结束任务：取已结束任务 end_time 的最大值
+  //    - 否则：取所有任务 updated_at 的最大值（表示仍在进行中的最近更新时间）
+  const projectDurationMs = React.useMemo(() => {
+    if (!tasks || tasks.length === 0) return 0;
+
+    const toMs = (v: any) => {
+      const n = new Date(v as string).getTime();
+      return Number.isNaN(n) ? NaN : n;
+    };
+
+    // 1) 全局开始
+    const allStarts = tasks
+      .map((t: any) => toMs(t.start_time || t.created_at))
+      .filter((n: number) => !Number.isNaN(n));
+    const globalStart = allStarts.length > 0 ? Math.min(...allStarts) : Date.now();
+
+    // 2) 终止态集合
+    const terminal = new Set(['COMPLETED','SUCCESS','FINISHED','FAILED','FAILURE','ERROR','CANCELLED','TIMEOUT']);
+
+    // 3) 已结束任务的结束时间
+    const endedEnds = tasks
+      .map((t: any) => terminal.has(t.task_status) ? toMs(t.end_time) : NaN)
+      .filter((n: number) => !Number.isNaN(n));
+
+    let globalEnd: number | null = null;
+    if (endedEnds.length > 0) {
+      globalEnd = Math.max(...endedEnds);
+    } else {
+      // 4) 无已结束任务，则取最近一次 updated_at 代表“当前进度”
+      const latestUpdated = tasks
+        .map((t: any) => toMs(t.updated_at || t.created_at))
+        .filter((n: number) => !Number.isNaN(n));
+      if (latestUpdated.length > 0) globalEnd = Math.max(...latestUpdated);
+    }
+
+    if (!globalEnd || Number.isNaN(globalEnd)) return 0;
+    return Math.max(0, globalEnd - globalStart);
+  }, [tasks]);
   
   return (
     <div className={cn("h-full flex flex-col bg-gray-950 overflow-hidden", className)}>
@@ -1382,7 +1429,7 @@ export function NetworkTimeline({
         <div className="w-1/2 flex flex-col min-h-0">
           <div className="px-4 py-2.5 bg-gray-900/50 border-b border-gray-800 flex-shrink-0">
             <div className="text-sm font-medium text-gray-300 text-center">
-              时间线视图 (总耗时: {formatTime(maxTime)})
+              时间线视图 (总耗时: {formatTime(projectDurationMs)})
             </div>
           </div>
           <div className="flex-1 p-3.5 overflow-y-auto min-h-0">
@@ -1430,12 +1477,15 @@ export function NetworkTimeline({
                 {/* 任务条 */}
                 <div
                   className={cn(
-                    "absolute rounded-sm cursor-pointer transition-opacity",
+                    "absolute rounded-sm cursor-pointer transition-all duration-200",
                     task.level === 0 ? "top-0.5 h-3.5" : "top-0.5 h-2.5",
                     task.statusCode === 200 ? "bg-emerald-500" :
                     task.statusCode === 202 ? "bg-cyan-500" :
                     task.statusCode >= 400 ? "bg-rose-500" : "bg-amber-500",
-                    selectedTask === task.id ? "opacity-100" : "opacity-80 hover:opacity-95",
+                    // 选中时明显高亮：提高不透明度、描边、阴影与z-index
+                    selectedTask === task.id
+                      ? "opacity-100 ring-2 ring-cyan-300/90 shadow-[0_0_10px_rgba(34,211,238,0.6)] z-10"
+                      : "opacity-80 hover:opacity-95",
                     task.level === 1 && "opacity-70"
                   )}
                   style={{