diff --git a/frontend/web/src/components/WindowTimeline.tsx b/frontend/web/src/components/WindowTimeline.tsx
index 15bf84f..9bc8145 100644
--- a/frontend/web/src/components/WindowTimeline.tsx
+++ b/frontend/web/src/components/WindowTimeline.tsx
@@ -26,6 +26,8 @@ interface WindowTimelineProps {
   colorLabels?: Record<string, string>
   showLegend?: boolean
   height?: number
+  /** Spread markers that would overlap onto separate vertical rows. */
+  stagger?: boolean
 }
 
 const PALETTE = [
@@ -35,6 +37,10 @@ const PALETTE = [
 
 const TICK_COUNT = 6
 
+/** Markers closer than this fraction of the window collide and need their own row. */
+const STAGGER_GAP = 0.04
+const STAGGER_ROW_PX = 16
+
 export function fmtTick(seconds: number): string {
   if (seconds < 3600) return `${Math.round(seconds / 60)}m`
   const h = seconds / 3600
@@ -42,7 +48,7 @@ export function fmtTick(seconds: number): string {
 }
 
 export default function WindowTimeline({
-  windowSeconds, markers, colorMap, colorLabels, showLegend = false, height = 64,
+  windowSeconds, markers, colorMap, colorLabels, showLegend = false, height = 64, stagger = false,
 }: WindowTimelineProps) {
   const window = windowSeconds > 0 ? windowSeconds : 1
   const uniqueKeys = Array.from(new Set(markers.map((m) => m.colorKey))).sort()
@@ -50,11 +56,33 @@ export default function WindowTimeline({
     colorMap?.[key] ?? PALETTE[Math.max(0, uniqueKeys.indexOf(key)) % PALETTE.length]
   const leftPct = (offset: number) => `${Math.min(1, Math.max(0, offset / window)) * 100}%`
 
+  // Greedy row assignment in offset order: a marker joins the first row whose
+  // previous marker is far enough away, otherwise it opens a new row.
+  const slotOf: number[] = markers.map(() => 0)
+  let rowCount = 1
+  if (stagger) {
+    const lastEnd: number[] = []
+    const order = markers.map((_, i) => i).sort((a, b) => markers[a].offsetSeconds - markers[b].offsetSeconds)
+    for (const i of order) {
+      const off = markers[i].offsetSeconds
+      let s = lastEnd.findIndex((last) => off - last >= STAGGER_GAP * window)
+      if (s === -1) {
+        s = lastEnd.length
+        lastEnd.push(0)
+      }
+      lastEnd[s] = off
+      slotOf[i] = s
+    }
+    rowCount = Math.max(1, lastEnd.length)
+  }
+  const rowY = (slot: number) => (slot - (rowCount - 1) / 2) * STAGGER_ROW_PX
+  const trackHeight = rowCount > 1 ? 24 + rowCount * STAGGER_ROW_PX : height
+
   const ticks = Array.from({ length: TICK_COUNT + 1 }, (_, i) => i / TICK_COUNT)
 
   return (
     <div>
-      <div style={{ position: 'relative', height, margin: '0 12px' }}>
+      <div style={{ position: 'relative', height: trackHeight, margin: '0 12px' }}>
         <div style={{
           position: 'absolute', left: 0, right: 0, top: '50%',
           height: 2, background: colors.border,
@@ -75,7 +103,7 @@ export default function WindowTimeline({
           </div>
         ))}
 
-        {markers.map((m) => {
+        {markers.map((m, idx) => {
           const c = colorOf(m.colorKey)
           return (
             <Tooltip key={m.key} title={m.tooltip}>
@@ -83,7 +111,7 @@ export default function WindowTimeline({
                 onClick={m.onClick}
                 style={{
                   position: 'absolute', left: leftPct(m.offsetSeconds), top: '50%',
-                  transform: 'translate(-50%, -50%)',
+                  transform: `translate(-50%, -50%)${stagger ? ` translateY(${rowY(slotOf[idx])}px)` : ''}`,
                   cursor: m.onClick ? 'pointer' : 'default',
                 }}
               >
diff --git a/frontend/web/src/pages/Campaigns.tsx b/frontend/web/src/pages/Campaigns.tsx
index a0c0661..fb87ca3 100644
--- a/frontend/web/src/pages/Campaigns.tsx
+++ b/frontend/web/src/pages/Campaigns.tsx
@@ -130,8 +130,6 @@ export default function CampaignsPage() {
         key: `plan-${i}`,
         offsetSeconds: offsetHours * 3600,
         colorKey: e.scenario_id as string,
-        label: name,
-        badge: count > 1 ? `×${count}` : undefined,
         tooltip: `${name} · +${offsetHours}h · ${count} 次`,
       }
     })
@@ -455,7 +453,15 @@ export default function CampaignsPage() {
                 tooltip="服务对象的一个完整服务周期（如早 8 点到次日早 8 点 = 24 小时），所有计划条目都落在窗口内"
                 rules={[{ required: true }]}
               >
-                <Select options={WINDOW_OPTIONS} />
+                <Select
+                  options={WINDOW_OPTIONS}
+                  onChange={() => {
+                    // Shrinking the window can invalidate existing plan offsets —
+                    // re-validate them so the errors surface immediately.
+                    const plan = (form.getFieldValue('plan') as PlanFormEntry[] | undefined) ?? []
+                    form.validateFields(plan.map((_, i) => ['plan', i, 'offset_hours'])).catch(() => {})
+                  }}
+                />
               </Form.Item>
               <Form.Item
                 name="realtime"
@@ -518,6 +524,7 @@ export default function CampaignsPage() {
                     markers={planMarkers}
                     colorLabels={scenarioNames}
                     showLegend
+                    stagger
                   />
                 ) : (
                   <div style={{ textAlign: 'center', color: colors.textMuted, padding: '12px 0' }}>
@@ -559,8 +566,24 @@ export default function CampaignsPage() {
                               options={scenarios.map((s) => ({ label: s.name, value: s.id }))}
                             />
                           </Form.Item>
-                          <Form.Item name={[field.name, 'offset_hours']} style={{ width: 140, marginBottom: 0 }}>
-                            <InputNumber min={0} step={0.5} addonAfter="小时后" style={{ width: '100%' }} />
+                          <Form.Item
+                            name={[field.name, 'offset_hours']}
+                            style={{ width: 140, marginBottom: 0 }}
+                            rules={[{
+                              validator: async (_, v: number | undefined) => {
+                                if (v == null) return
+                                const win = (form.getFieldValue('window_seconds') as number | undefined) ?? 0
+                                if (win > 0 && v * 3600 > win) {
+                                  throw new Error(`不能超过窗口长度（${fmtWindow(win)}）`)
+                                }
+                              },
+                            }]}
+                          >
+                            <InputNumber
+                              min={0} step={0.5} addonAfter="小时后"
+                              max={wWindow > 0 ? wWindow / 3600 : undefined}
+                              style={{ width: '100%' }}
+                            />
                           </Form.Item>
                           <Form.Item name={[field.name, 'count']} style={{ width: 104, marginBottom: 0 }}>
                             <InputNumber min={1} addonAfter="次" style={{ width: '100%' }} />