diff --git a/frontend/src/collapsible.test.js b/frontend/src/collapsible.test.js
new file mode 100644
index 0000000..c3dac0c
--- /dev/null
+++ b/frontend/src/collapsible.test.js
@@ -0,0 +1,64 @@
+import { mount } from '@vue/test-utils'
+import { beforeEach, describe, expect, it } from 'vitest'
+import CollapsiblePanel from './components/CollapsiblePanel.vue'
+
+describe('CollapsiblePanel', () => {
+  beforeEach(() => {
+    localStorage.clear()
+  })
+
+  it('renders the title and slot when open by default', () => {
+    const wrapper = mount(CollapsiblePanel, {
+      props: { title: 'Strategy' },
+      slots: { default: '<p>content</p>' },
+    })
+    expect(wrapper.text()).toContain('Strategy')
+    expect(wrapper.text()).toContain('content')
+    expect(wrapper.find('button').attributes('aria-expanded')).toBe('true')
+  })
+
+  it('hides the slot after clicking the header', async () => {
+    const wrapper = mount(CollapsiblePanel, {
+      props: { title: 'Strategy' },
+      slots: { default: '<p>content</p>' },
+    })
+    await wrapper.find('button').trigger('click')
+    expect(wrapper.find('button').attributes('aria-expanded')).toBe('false')
+    // v-show keeps the node but hides it.
+    expect(wrapper.find('div[style*="display: none"]').exists()).toBe(true)
+  })
+
+  it('shows the summary only when collapsed', async () => {
+    const wrapper = mount(CollapsiblePanel, {
+      props: { title: 'Backtest', summary: 'BTC/USDT 5m' },
+      slots: { default: '<p>content</p>' },
+    })
+    expect(wrapper.text()).not.toContain('BTC/USDT 5m')
+    await wrapper.find('button').trigger('click')
+    expect(wrapper.text()).toContain('BTC/USDT 5m')
+  })
+
+  it('persists the collapsed state in localStorage', async () => {
+    const wrapper = mount(CollapsiblePanel, {
+      props: { title: 'Backtest', storageKey: 'backtest' },
+      slots: { default: '<p>content</p>' },
+    })
+    await wrapper.find('button').trigger('click')
+    expect(localStorage.getItem('panel:backtest')).toBe('0')
+
+    // A fresh mount with the same key starts collapsed.
+    const remounted = mount(CollapsiblePanel, {
+      props: { title: 'Backtest', storageKey: 'backtest' },
+      slots: { default: '<p>content</p>' },
+    })
+    expect(remounted.find('button').attributes('aria-expanded')).toBe('false')
+  })
+
+  it('honours defaultOpen when nothing is stored', () => {
+    const wrapper = mount(CollapsiblePanel, {
+      props: { title: 'Strategy', defaultOpen: false },
+      slots: { default: '<p>content</p>' },
+    })
+    expect(wrapper.find('button').attributes('aria-expanded')).toBe('false')
+  })
+})
diff --git a/frontend/src/components/BacktestPanel.vue b/frontend/src/components/BacktestPanel.vue
index 4e64e96..6a2f365 100644
--- a/frontend/src/components/BacktestPanel.vue
+++ b/frontend/src/components/BacktestPanel.vue
@@ -1,7 +1,8 @@
 <script setup>
-import { ref } from 'vue'
+import { computed, ref } from 'vue'
 import * as api from '../api'
 import { fmtMoney, fmtPrice, pnlClass, signed } from '../format'
+import CollapsiblePanel from './CollapsiblePanel.vue'
 import EquityChart from './EquityChart.vue'
 import StrategyForm from './StrategyForm.vue'
 
@@ -15,6 +16,12 @@ const error = ref(null)
 const result = ref(null)
 const limit = ref(500)
 
+const summary = computed(() => {
+  if (!result.value || result.value.error) return ''
+  const m = result.value.metrics
+  return `${result.value.symbol} ${result.value.timeframe} · ${signed(m.total_return_pct)}% · ${m.num_trades} trades`
+})
+
 async function run(payload) {
   running.value = true
   error.value = null
@@ -30,15 +37,9 @@ async function run(payload) {
 </script>
 
 <template>
-  <div class="card space-y-3">
-    <div class="flex items-center justify-between">
-      <h2 class="font-semibold">Backtest</h2>
-      <span v-if="result" class="text-xs text-slate-400">
-        {{ result.symbol }} {{ result.timeframe }} · {{ result.equity_curve.length }} candles
-      </span>
-    </div>
-
-    <StrategyForm
+  <CollapsiblePanel title="Backtest" storage-key="backtest" :summary="summary">
+    <div class="space-y-3">
+      <StrategyForm
       :strategies="strategies"
       :busy="running"
       :symbol="status.symbol"
@@ -136,5 +137,6 @@ async function run(payload) {
         </table>
       </div>
     </template>
-  </div>
+    </div>
+  </CollapsiblePanel>
 </template>
diff --git a/frontend/src/components/CollapsiblePanel.vue b/frontend/src/components/CollapsiblePanel.vue
new file mode 100644
index 0000000..2c107e2
--- /dev/null
+++ b/frontend/src/components/CollapsiblePanel.vue
@@ -0,0 +1,67 @@
+<script setup>
+import { ref, watch } from 'vue'
+
+const props = defineProps({
+  title: { type: String, required: true },
+  // Optional right-aligned summary shown in the header (visible when collapsed).
+  summary: { type: String, default: '' },
+  storageKey: { type: String, default: '' },
+  defaultOpen: { type: Boolean, default: true },
+})
+const emit = defineEmits(['toggle'])
+
+function readInitial() {
+  if (!props.storageKey) return props.defaultOpen
+  try {
+    const stored = localStorage.getItem(`panel:${props.storageKey}`)
+    if (stored === '1') return true
+    if (stored === '0') return false
+  } catch {
+    // localStorage unavailable (private mode); fall back to the default
+  }
+  return props.defaultOpen
+}
+
+const open = ref(readInitial())
+
+watch(open, (value) => {
+  emit('toggle', value)
+  if (!props.storageKey) return
+  try {
+    localStorage.setItem(`panel:${props.storageKey}`, value ? '1' : '0')
+  } catch {
+    // ignore
+  }
+})
+</script>
+
+<template>
+  <section class="card">
+    <button
+      type="button"
+      class="flex w-full items-center justify-between gap-3 text-left"
+      :aria-expanded="open"
+      @click="open = !open"
+    >
+      <span class="flex items-center gap-2 font-semibold">
+        <svg
+          class="h-3.5 w-3.5 shrink-0 text-slate-400 transition-transform"
+          :class="open ? 'rotate-90' : ''"
+          viewBox="0 0 16 16"
+          fill="currentColor"
+          aria-hidden="true"
+        >
+          <path d="M6 3.5 11 8l-5 4.5z" />
+        </svg>
+        {{ title }}
+      </span>
+      <span v-if="!open && summary" class="truncate text-xs font-normal text-slate-400">
+        {{ summary }}
+      </span>
+    </button>
+
+    <div v-show="open" class="mt-3">
+      <slot />
+    </div>
+  </section>
+</template>
diff --git a/frontend/src/components/StrategyPanel.vue b/frontend/src/components/StrategyPanel.vue
index 137a85b..2b1c885 100644
--- a/frontend/src/components/StrategyPanel.vue
+++ b/frontend/src/components/StrategyPanel.vue
@@ -1,4 +1,6 @@
 <script setup>
+import { computed } from 'vue'
+import CollapsiblePanel from './CollapsiblePanel.vue'
 import StrategyForm from './StrategyForm.vue'
 
 const props = defineProps({
@@ -9,6 +11,11 @@ const props = defineProps({
 })
 const emit = defineEmits(['start', 'stop', 'kill', 'save-preset', 'delete-preset'])
 
+const summary = computed(() => {
+  const name = props.status.strategy_name || 'none'
+  return `${name} · ${props.status.running ? 'running' : 'stopped'}`
+})
+
 function confirmKill() {
   if (window.confirm('Kill switch: flatten the position and halt trading?')) {
     emit('kill')
@@ -17,41 +24,33 @@ function confirmKill() {
 </script>
 
 <template>
-  <div class="card space-y-3">
-    <div class="flex items-center justify-between">
-      <h2 class="font-semibold">Strategy</h2>
-      <span
-        class="rounded-full px-2 py-0.5 text-xs font-medium"
-        :class="status.running ? 'bg-emerald-500/20 text-emerald-300' : 'bg-slate-600/40 text-slate-300'"
-      >
-        {{ status.running ? 'running' : 'stopped' }}
-      </span>
-    </div>
+  <CollapsiblePanel title="Strategy" storage-key="strategy" :summary="summary">
+    <div class="space-y-3">
+      <StrategyForm
+        :strategies="strategies"
+        :disabled="status.running"
+        :busy="busy"
+        submit-label="Start bot"
+        :symbol="status.symbol"
+        :timeframe="status.timeframe"
+        :presets="presets"
+        @submit="emit('start', $event)"
+        @save-preset="emit('save-preset', $event)"
+        @delete-preset="emit('delete-preset', $event)"
+      />
 
-    <StrategyForm
-      :strategies="strategies"
-      :disabled="status.running"
-      :busy="busy"
-      submit-label="Start bot"
-      :symbol="status.symbol"
-      :timeframe="status.timeframe"
-      :presets="presets"
-      @submit="emit('start', $event)"
-      @save-preset="emit('save-preset', $event)"
-      @delete-preset="emit('delete-preset', $event)"
-    />
-
-    <div class="flex flex-wrap gap-2">
-      <button class="btn-danger" :disabled="busy || !status.running" @click="emit('stop')">
-        Stop bot
-      </button>
-      <button
-        class="btn bg-rose-700 font-bold uppercase text-white hover:bg-rose-600"
-        :disabled="busy || (!status.running && status.open_positions === 0)"
-        @click="confirmKill"
-      >
-        Kill switch
-      </button>
+      <div class="flex flex-wrap gap-2">
+        <button class="btn-danger" :disabled="busy || !status.running" @click="emit('stop')">
+          Stop bot
+        </button>
+        <button
+          class="btn bg-rose-700 font-bold uppercase text-white hover:bg-rose-600"
+          :disabled="busy || (!status.running && status.open_positions === 0)"
+          @click="confirmKill"
+        >
+          Kill switch
+        </button>
+      </div>
     </div>
-  </div>
+  </CollapsiblePanel>
 </template>
diff --git a/frontend/src/components/SweepPanel.vue b/frontend/src/components/SweepPanel.vue
index bae0453..51b5149 100644
--- a/frontend/src/components/SweepPanel.vue
+++ b/frontend/src/components/SweepPanel.vue
@@ -2,6 +2,7 @@
 import { computed, ref, watch } from 'vue'
 import * as api from '../api'
 import { fmtMoney, pnlClass, signed } from '../format'
+import CollapsiblePanel from './CollapsiblePanel.vue'
 
 const props = defineProps({
   strategies: { type: Array, required: true },
@@ -21,6 +22,13 @@ const gridText = ref({})
 
 const selected = computed(() => props.strategies.find((s) => s.key === selectedKey.value))
 
+const summary = computed(() => {
+  if (!result.value) return ''
+  const top = result.value.rows[0]
+  const best = top ? ` · best ${signed(top.metrics.total_return_pct)}%` : ''
+  return `${result.value.combinations} combinations${best}`
+})
+
 watch(
   () => props.strategies,
   (list) => {
@@ -84,14 +92,8 @@ async function run() {
 </script>
 
 <template>
-  <div class="card space-y-3">
-    <div class="flex items-center justify-between">
-      <h2 class="font-semibold">Parameter sweep</h2>
-      <span v-if="result" class="text-xs text-slate-400">
-        {{ result.combinations }} combinations · top {{ result.rows.length }}
-      </span>
-    </div>
-
+  <CollapsiblePanel title="Parameter sweep" storage-key="sweep" :summary="summary">
+    <div class="space-y-3">
     <div class="grid gap-2 sm:grid-cols-4">
       <label class="space-y-1">
         <span class="label">Strategy</span>
@@ -168,5 +170,6 @@ async function run() {
         </tbody>
       </table>
     </div>
-  </div>
+    </div>
+  </CollapsiblePanel>
 </template>