diff --git a/web/src/components/DropDown.vue b/web/src/components/DropDown.vue
index f5fb329..09e9705 100644
--- a/web/src/components/DropDown.vue
+++ b/web/src/components/DropDown.vue
@@ -1,46 +1,335 @@
 <template>
-  <div ref="rootRef" class="dropdown" :class="{ open: visible }">
-    <div class="dropdown-trigger" @click="visible = !visible">
+  <div ref="rootRef" class="dropdown" :class="[openClass, placementClass]">
+    <div
+      ref="triggerRef"
+      class="dropdown-trigger"
+      role="button"
+      tabindex="0"
+      :aria-expanded="isOpen"
+      :aria-haspopup="true"
+      @click="toggle"
+      @keydown="onTriggerKeydown"
+    >
       <slot name="trigger"></slot>
     </div>
-    <Transition name="dropdown">
-      <div v-if="visible" class="dropdown-menu">
-        <slot></slot>
-      </div>
-    </Transition>
+    <Teleport to="body" :disabled="!teleport">
+      <Transition name="dropdown" @after-leave="onTransitionLeave">
+        <div
+          v-if="isOpen"
+          ref="menuRef"
+          class="dropdown-menu"
+          role="menu"
+          :aria-hidden="!isOpen"
+          @click="onMenuClick"
+        >
+          <div class="dropdown-arrow"></div>
+          <div class="dropdown-menu-inner">
+            <slot></slot>
+          </div>
+        </div>
+      </Transition>
+    </Teleport>
   </div>
 </template>
 
 <script setup>
-import { ref, onMounted, onBeforeUnmount } from 'vue'
+import { ref, computed, watch, onMounted, onBeforeUnmount, nextTick } from 'vue'
 
-const visible = ref(false)
+const props = defineProps({
+  modelValue: {
+    type: Boolean,
+    default: undefined,
+  },
+  placement: {
+    type: String,
+    default: 'bottom-end',
+    validator: (v) =>
+      [
+        'top-start',
+        'top-end',
+        'bottom-start',
+        'bottom-end',
+        'left-start',
+        'left-end',
+        'right-start',
+        'right-end',
+      ].includes(v),
+  },
+  teleport: {
+    type: Boolean,
+    default: true,
+  },
+  closeOnSelect: {
+    type: Boolean,
+    default: true,
+  },
+  closeOnOutsideClick: {
+    type: Boolean,
+    default: true,
+  },
+})
+
+const emit = defineEmits(['update:modelValue', 'open', 'close'])
+
+const internalVisible = ref(false)
 const rootRef = ref(null)
+const triggerRef = ref(null)
+const menuRef = ref(null)
+const focusedIndex = ref(-1)
+let resizeObserver = null
+
+const isOpen = computed(() => props.modelValue ?? internalVisible.value)
+const openClass = computed(() => (isOpen.value ? 'open' : ''))
+const placementClass = computed(() => `placement-${props.placement}`)
+
+function setOpen(val) {
+  if (val === isOpen.value) return
+  internalVisible.value = val
+  if (props.modelValue === undefined) {
+    emit('update:modelValue', val)
+  }
+  emit(val ? 'open' : 'close')
+  if (val) {
+    focusedIndex.value = -1
+    nextTick(() => focusFirstItem())
+  }
+}
+
+function toggle() {
+  setOpen(!isOpen.value)
+}
+
+function onTransitionLeave() {
+  focusedIndex.value = -1
+}
+
+function updatePosition() {
+  const menuEl = menuRef.value
+  const triggerEl = triggerRef.value
+  if (!menuEl || !triggerEl) return
+
+  const triggerRect = triggerEl.getBoundingClientRect()
+  const menuRect = menuEl.getBoundingClientRect()
+  const arrowGap = 6
+  const arrowOffset = 12
+  const { placement } = props
+
+  let top, left, arrowTop, arrowLeft
+
+  switch (placement) {
+    case 'bottom-end':
+      top = triggerRect.bottom + arrowGap
+      left = triggerRect.right - menuRect.width
+      arrowTop = -arrowGap + 1
+      arrowLeft = menuRect.width - arrowOffset
+      break
+    case 'bottom-start':
+      top = triggerRect.bottom + arrowGap
+      left = triggerRect.left
+      arrowTop = -arrowGap + 1
+      arrowLeft = arrowOffset
+      break
+    case 'top-end':
+      top = triggerRect.top - menuRect.height - arrowGap
+      left = triggerRect.right - menuRect.width
+      arrowTop = menuRect.height - arrowGap - 1
+      arrowLeft = menuRect.width - arrowOffset
+      break
+    case 'top-start':
+      top = triggerRect.top - menuRect.height - arrowGap
+      left = triggerRect.left
+      arrowTop = menuRect.height - arrowGap - 1
+      arrowLeft = arrowOffset
+      break
+    case 'right-end':
+      top = triggerRect.bottom - menuRect.height
+      left = triggerRect.right + arrowGap
+      arrowTop = 'auto'
+      arrowLeft = -arrowGap + 1
+      break
+    case 'right-start':
+      top = triggerRect.top
+      left = triggerRect.right + arrowGap
+      arrowTop = arrowOffset
+      arrowLeft = -arrowGap + 1
+      break
+    case 'left-end':
+      top = triggerRect.bottom - menuRect.height
+      left = triggerRect.left - menuRect.width - arrowGap
+      arrowTop = 'auto'
+      arrowLeft = menuRect.width - arrowGap - 1
+      break
+    case 'left-start':
+      top = triggerRect.top
+      left = triggerRect.left - menuRect.width - arrowGap
+      arrowTop = arrowOffset
+      arrowLeft = menuRect.width - arrowGap - 1
+      break
+    default:
+      top = triggerRect.bottom + arrowGap
+      left = triggerRect.right - menuRect.width
+      arrowTop = -arrowGap + 1
+      arrowLeft = menuRect.width - arrowOffset
+  }
+
+  const padding = 8
+  if (top < padding) top = triggerRect.bottom + arrowGap
+  if (left < padding) left = padding
+  if (left + menuRect.width > window.innerWidth - padding) {
+    left = window.innerWidth - menuRect.width - padding
+  }
+  if (top + menuRect.height > window.innerHeight - padding) {
+    top = triggerRect.top - menuRect.height - arrowGap
+  }
+
+  menuEl.style.top = `${top}px`
+  menuEl.style.left = `${left}px`
+
+  const arrowEl = menuEl.querySelector('.dropdown-arrow')
+  if (arrowEl) {
+    if (arrowTop !== 'auto') arrowEl.style.top = `${arrowTop}px`
+    else arrowEl.style.top = 'auto'
+    if (arrowLeft !== 'auto') arrowEl.style.left = `${arrowLeft}px`
+    else arrowEl.style.left = 'auto'
+  }
+}
 
 function handleClickOutside(e) {
-  if (rootRef.value && !rootRef.value.contains(e.target)) {
-    visible.value = false
+  if (!props.closeOnOutsideClick) return
+  if (rootRef.value?.contains(e.target)) return
+  if (menuRef.value?.contains(e.target)) return
+  if (isOpen.value) {
+    setOpen(false)
   }
 }
 
 function handleKeyDown(e) {
-  if (e.key === 'Escape') {
-    visible.value = false
+  if (e.key === 'Escape' && isOpen.value) {
+    e.preventDefault()
+    setOpen(false)
+    triggerRef.value?.focus()
   }
 }
 
+function onTriggerKeydown(e) {
+  if (e.key === 'Enter' || e.key === ' ') {
+    e.preventDefault()
+    toggle()
+  } else if (['ArrowDown', 'ArrowUp'].includes(e.key) && isOpen.value) {
+    e.preventDefault()
+    if (e.key === 'ArrowDown') focusNextItem()
+    else focusPrevItem()
+  } else if (['ArrowDown', 'ArrowUp', 'Enter', ' '].includes(e.key) && !isOpen.value) {
+    e.preventDefault()
+    setOpen(true)
+    nextTick(() => {
+      if (e.key === 'ArrowUp') focusLastItem()
+      else focusFirstItem()
+    })
+  }
+}
+
+function onMenuClick(e) {
+  const item = e.target.closest('button, .dropdown-item, [role="menuitem"], a')
+  if (!item) return
+  if (item.disabled || item.getAttribute('aria-disabled') === 'true') {
+    e.stopPropagation()
+    return
+  }
+  if (props.closeOnSelect) {
+    setOpen(false)
+    triggerRef.value?.focus()
+  }
+}
+
+function getMenuItems() {
+  if (!menuRef.value) return []
+  return Array.from(
+    menuRef.value.querySelectorAll(
+      'button:not([disabled]):not(.dropdown-divider), .dropdown-item:not([disabled]):not([aria-disabled="true"]), [role="menuitem"]:not([aria-disabled="true"]), a',
+    ),
+  )
+}
+
+function focusItem(index) {
+  const items = getMenuItems()
+  if (items.length === 0) return
+  const clampedIndex = ((index % items.length) + items.length) % items.length
+  items[clampedIndex]?.focus()
+  focusedIndex.value = clampedIndex
+}
+
+function focusFirstItem() { focusItem(0) }
+function focusLastItem() { focusItem(getMenuItems().length - 1) }
+function focusNextItem() { focusItem(focusedIndex.value + 1) }
+function focusPrevItem() { focusItem(focusedIndex.value - 1) }
+
+function handleMenuKeydown(e) {
+  if (!isOpen.value) return
+  const items = getMenuItems()
+  const currentIdx = items.indexOf(document.activeElement)
+
+  if (e.key === 'ArrowDown') {
+    e.preventDefault()
+    focusItem(currentIdx + 1)
+  } else if (e.key === 'ArrowUp') {
+    e.preventDefault()
+    focusItem(currentIdx - 1)
+  } else if (e.key === 'Home') {
+    e.preventDefault()
+    focusFirstItem()
+  } else if (e.key === 'End') {
+    e.preventDefault()
+    focusLastItem()
+  } else if (e.key === 'Tab') {
+    setOpen(false)
+  }
+}
+
+watch(isOpen, (val) => {
+  if (val) nextTick(() => updatePosition())
+})
+
+watch(
+  () => props.modelValue,
+  (val) => {
+    if (val !== undefined && val !== internalVisible.value) {
+      internalVisible.value = val
+      if (val) {
+        emit('open')
+        nextTick(() => focusFirstItem())
+      } else {
+        emit('close')
+      }
+    }
+  },
+)
+
 onMounted(() => {
-  document.addEventListener('click', handleClickOutside)
+  document.addEventListener('click', handleClickOutside, true)
   document.addEventListener('keydown', handleKeyDown)
+  menuRef.value?.addEventListener('keydown', handleMenuKeydown)
+  resizeObserver = new ResizeObserver(() => {
+    if (isOpen.value) updatePosition()
+  })
+  if (rootRef.value?.parentElement) {
+    resizeObserver.observe(rootRef.value.parentElement)
+  }
+  window.addEventListener('scroll', () => {
+    if (isOpen.value) updatePosition()
+  }, true)
 })
 
 onBeforeUnmount(() => {
-  document.removeEventListener('click', handleClickOutside)
+  document.removeEventListener('click', handleClickOutside, true)
   document.removeEventListener('keydown', handleKeyDown)
+  menuRef.value?.removeEventListener('keydown', handleMenuKeydown)
+  resizeObserver?.disconnect()
 })
 </script>
 
 <style scoped>
+/* ====== Container ====== */
 .dropdown {
   position: relative;
   display: inline-block;
@@ -51,25 +340,168 @@ onBeforeUnmount(() => {
   align-items: center;
   justify-content: center;
   cursor: pointer;
+  outline: none;
+  border-radius: var(--radius-2);
+  transition: background-color 0.2s ease, transform 0.15s ease;
 }
 
+.dropdown-trigger:hover { transform: scale(1.05); }
+.dropdown-trigger:active { transform: scale(0.95); }
+
+.dropdown-trigger:focus-visible {
+  box-shadow: 0 0 0 2px var(--brand-light), 0 0 0 4px var(--brand);
+}
+
+/* ====== Menu Shell ====== */
 .dropdown-menu {
-  position: absolute;
-  top: calc(100% + 4px);
-  right: 0;
-  z-index: 1000;
+  position: fixed;
+  z-index: 9999;
+  min-width: 160px;
+  filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.07))
+          drop-shadow(0 10px 15px rgba(0, 0, 0, 0.1));
+}
+
+.dropdown-menu-inner {
   background-color: var(--gray-0);
   border: 1px solid var(--border);
   border-radius: var(--radius-2);
-  box-shadow: var(--shadow-3);
   padding: var(--size-1) 0;
-  min-width: 150px;
   display: flex;
   flex-direction: column;
   overflow: hidden;
+  position: relative;
 }
 
-.dropdown-menu button {
+/* Arrow */
+.dropdown-arrow {
+  position: absolute;
+  width: 10px;
+  height: 10px;
+  background: var(--gray-0);
+  border: 1px solid var(--border);
+  transform: rotate(45deg);
+  z-index: 1;
+  pointer-events: none;
+}
+
+.dropdown.placement-bottom-end .dropdown-arrow,
+.dropdown.placement-bottom-start .dropdown-arrow {
+  border-right: none;
+  border-bottom: none;
+}
+
+.dropdown.placement-top-end .dropdown-arrow,
+.dropdown.placement-top-start .dropdown-arrow {
+  border-left: none;
+  border-top: none;
+}
+
+/* ====== .dropdown-item — Primary item system (any element) ====== */
+/* When <button class="dropdown-item">, ONLY .dropdown-item styles apply */
+.dropdown-item {
+  position: relative;
+  width: 100%;
+  padding: var(--size-2) var(--size-3);
+  border: none;
+  background: none;
+  text-align: left;
+  cursor: pointer;
+  font-size: var(--font-size-1);
+  font-weight: 500;
+  color: var(--text-secondary);
+  transition: all 0.2s ease;
+  display: flex;
+  align-items: center;
+  gap: var(--size-3);
+  outline: none;
+  letter-spacing: -0.01em;
+}
+
+.dropdown-item::before {
+  content: '';
+  position: absolute;
+  left: 0;
+  top: 50%;
+  transform: translateY(-50%) scaleX(0);
+  width: 3px;
+  height: 60%;
+  background: var(--brand);
+  border-radius: 0 2px 2px 0;
+  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.dropdown-item:hover {
+  background-color: var(--surface-hover);
+  color: var(--text-primary);
+}
+
+.dropdown-item:hover::before {
+  transform: translateY(-50%) scaleX(1);
+}
+
+.dropdown-item:focus-visible {
+  background-color: var(--surface-hover);
+  color: var(--text-primary);
+}
+
+.dropdown-item:focus-visible::before {
+  transform: translateY(-50%) scaleX(1);
+}
+
+.dropdown-item:active {
+  transform: scale(0.98);
+}
+
+.dropdown-item[disabled],
+.dropdown-item[aria-disabled="true"] {
+  opacity: 0.4;
+  cursor: not-allowed;
+  pointer-events: none;
+}
+
+/* Danger variant */
+.dropdown-item.danger { color: var(--red-7); }
+.dropdown-item.danger::before { background: var(--red-7); }
+
+.dropdown-item.danger:hover {
+  background-color: var(--red-1, #fef2f2);
+  color: var(--red-7);
+}
+
+/* Item sub-elements */
+.dropdown-item .dropdown-icon {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  color: var(--text-muted);
+  transition: color 0.2s ease;
+}
+
+.dropdown-item:hover .dropdown-icon,
+.dropdown-item:focus-visible .dropdown-icon {
+  color: var(--brand);
+}
+
+.dropdown-item.danger .dropdown-icon { color: var(--red-7); }
+
+.dropdown-item .dropdown-text {
+  flex: 1;
+  white-space: nowrap;
+}
+
+.dropdown-item .dropdown-hint {
+  font-size: var(--font-size-0);
+  color: var(--text-muted);
+  font-weight: 400;
+}
+
+/* ====== Bare <button> / <a> — fallback for simple usage ====== */
+/* All selectors use :not(.dropdown-item) to avoid conflict */
+
+.dropdown-menu button:not(.dropdown-item),
+.dropdown-menu a {
+  position: relative;
   width: 100%;
   padding: var(--size-2) var(--size-4);
   border: none;
@@ -79,37 +511,160 @@ onBeforeUnmount(() => {
   font-size: var(--font-size-0);
   font-weight: 500;
   color: var(--text-secondary);
-  transition: all 0.15s;
+  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
   display: flex;
   align-items: center;
-  gap: var(--size-2);
+  gap: var(--size-3);
+  outline: none;
+  letter-spacing: 0.01em;
 }
 
-.dropdown-menu button:hover {
-  background-color: var(--surface);
+.dropdown-menu button:not(.dropdown-item)::before,
+.dropdown-menu a::before {
+  content: '';
+  position: absolute;
+  left: 0;
+  top: 50%;
+  transform: translateY(-50%) scaleX(0);
+  width: 3px;
+  height: 60%;
+  background: var(--brand);
+  border-radius: 0 2px 2px 0;
+  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.dropdown-menu button:not(.dropdown-item):hover,
+.dropdown-menu a:hover {
+  background-color: var(--surface-hover);
   color: var(--text-primary);
 }
 
-.dropdown-menu button[type="reset"] {
+.dropdown-menu button:not(.dropdown-item):hover::before,
+.dropdown-menu a:hover::before {
+  transform: translateY(-50%) scaleX(1);
+}
+
+.dropdown-menu button:not(.dropdown-item):focus-visible,
+.dropdown-menu a:focus-visible {
+  background-color: var(--surface-hover);
+  color: var(--text-primary);
+}
+
+.dropdown-menu button:not(.dropdown-item):focus-visible::before,
+.dropdown-menu a:focus-visible::before {
+  transform: translateY(-50%) scaleX(1);
+}
+
+.dropdown-menu button:not(.dropdown-item):active,
+.dropdown-menu a:active {
+  transform: scale(0.98);
+}
+
+.dropdown-menu button:not(.dropdown-item)[disabled],
+.dropdown-menu a[disabled] {
+  opacity: 0.4;
+  cursor: not-allowed;
+  pointer-events: none;
+}
+
+/* Destructive via type="reset" — only on bare buttons */
+.dropdown-menu button:not(.dropdown-item)[type="reset"] { color: var(--red-7); }
+.dropdown-menu button:not(.dropdown-item)[type="reset"]::before { background: var(--red-7); }
+
+.dropdown-menu button:not(.dropdown-item)[type="reset"]:hover {
+  background-color: var(--red-1, #fef2f2);
   color: var(--red-7);
 }
 
-.dropdown-menu button[type="reset"]:hover {
-  background-color: var(--red-1, #fef2f2);
+/* Divider */
+.dropdown-divider,
+.dropdown-menu hr {
+  height: 1px;
+  margin: var(--size-1) var(--size-2);
+  padding: 0;
+  border: none;
+  background: linear-gradient(90deg, transparent, var(--border), transparent);
+  pointer-events: none;
 }
 
-/* 过渡动画 */
+/* ====== Transitions ====== */
 .dropdown-enter-active,
 .dropdown-leave-active {
-  transition:
-    opacity 0.15s ease,
-    transform 0.15s ease;
-  transform-origin: top right;
+  transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 .dropdown-enter-from,
-.dropdown-leave-to {
-  opacity: 0;
-  transform: scale(0.96) translateY(-4px);
+.dropdown-leave-to { opacity: 0; }
+
+.dropdown-enter-active .dropdown-menu-inner {
+  animation: dropdown-pop-in 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
+}
+
+.dropdown-leave-active .dropdown-menu-inner {
+  animation: dropdown-pop-out 0.15s cubic-bezier(0.4, 0, 0.2, 1) forwards;
+}
+
+.dropdown-enter-active .dropdown-arrow {
+  animation: dropdown-arrow-in 0.2s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
+}
+
+.dropdown-leave-active .dropdown-arrow {
+  animation: dropdown-arrow-out 0.15s cubic-bezier(0.4, 0, 0.2, 1) forwards;
+}
+
+@keyframes dropdown-pop-in {
+  from { opacity: 0; transform: scale(0.92) translateY(-6px); }
+  to { opacity: 1; transform: scale(1) translateY(0); }
+}
+
+@keyframes dropdown-pop-out {
+  from { opacity: 1; transform: scale(1) translateY(0); }
+  to { opacity: 0; transform: scale(0.96) translateY(-4px); }
+}
+
+@keyframes dropdown-arrow-in {
+  from { opacity: 0; transform: rotate(45deg) scale(0); }
+  to { opacity: 1; transform: rotate(45deg) scale(1); }
+}
+
+@keyframes dropdown-arrow-out {
+  from { opacity: 1; transform: rotate(45deg) scale(1); }
+  to { opacity: 0; transform: rotate(45deg) scale(0); }
+}
+
+/* Staggered items */
+.dropdown-enter-active .dropdown-item,
+.dropdown-enter-active button:not(.dropdown-item),
+.dropdown-enter-active a {
+  animation: dropdown-item-in 0.25s cubic-bezier(0.4, 0, 0.2, 1) backwards;
+}
+
+.dropdown-enter-active .dropdown-item:nth-child(1),
+.dropdown-enter-active button:not(.dropdown-item):nth-child(1),
+.dropdown-enter-active a:nth-child(1) { animation-delay: 0.03s; }
+
+.dropdown-enter-active .dropdown-item:nth-child(2),
+.dropdown-enter-active button:not(.dropdown-item):nth-child(2),
+.dropdown-enter-active a:nth-child(2) { animation-delay: 0.06s; }
+
+.dropdown-enter-active .dropdown-item:nth-child(3),
+.dropdown-enter-active button:not(.dropdown-item):nth-child(3),
+.dropdown-enter-active a:nth-child(3) { animation-delay: 0.09s; }
+
+.dropdown-enter-active .dropdown-item:nth-child(4),
+.dropdown-enter-active button:not(.dropdown-item):nth-child(4),
+.dropdown-enter-active a:nth-child(4) { animation-delay: 0.12s; }
+
+.dropdown-enter-active .dropdown-item:nth-child(5),
+.dropdown-enter-active button:not(.dropdown-item):nth-child(5),
+.dropdown-enter-active a:nth-child(5) { animation-delay: 0.15s; }
+
+.dropdown-enter-active .dropdown-item:nth-child(6),
+.dropdown-enter-active button:not(.dropdown-item):nth-child(6),
+.dropdown-enter-active a:nth-child(6) { animation-delay: 0.18s; }
+
+@keyframes dropdown-item-in {
+  from { opacity: 0; transform: translateY(4px) translateX(-4px); }
+  to { opacity: 1; transform: translateY(0) translateX(0); }
 }
 </style>
diff --git a/web/src/components/LibraryCard.vue b/web/src/components/LibraryCard.vue
index b770507..6e26a51 100644
--- a/web/src/components/LibraryCard.vue
+++ b/web/src/components/LibraryCard.vue
@@ -8,15 +8,24 @@
       <template v-slot:trigger>
         <button class="card-menu-btn" aria-label="更多操作"><EllipsisVertical :size="16" /></button>
       </template>
-      <button @click="viewSongs">查看歌曲</button>
-      <button @click="scanCard">扫描</button>
-      <button type="reset" @click="deleteCard">删除</button>
+      <button class="dropdown-item" @click="viewSongs">
+        <ListMusic class="dropdown-icon" :size="16" />
+        <span class="dropdown-text">查看歌曲</span>
+      </button>
+      <button class="dropdown-item" @click="scanCard">
+        <RotateCw class="dropdown-icon" :size="16" />
+        <span class="dropdown-text">扫描</span>
+      </button>
+      <button class="dropdown-item danger" type="button" @click="deleteCard">
+        <Trash2 class="dropdown-icon" :size="16" />
+        <span class="dropdown-text">删除</span>
+      </button>
     </DropDown>
   </div>
 </template>
 
 <script setup>
-import { EllipsisVertical, FolderOpen } from 'lucide-vue-next'
+import { EllipsisVertical, FolderOpen, ListMusic, RotateCw, Trash2 } from 'lucide-vue-next'
 import DropDown from './DropDown.vue'
 
 const props = defineProps({
diff --git a/web/src/components/__tests__/DropDown.spec.js b/web/src/components/__tests__/DropDown.spec.js
index c6afedf..88a75a0 100644
--- a/web/src/components/__tests__/DropDown.spec.js
+++ b/web/src/components/__tests__/DropDown.spec.js
@@ -1,18 +1,37 @@
-import { describe, it, expect, vi } from 'vitest'
+import { describe, it, expect, vi, beforeEach } from 'vitest'
 import { mount, flushPromises } from '@vue/test-utils'
 import DropDown from '../DropDown.vue'
 
 describe('DropDown.vue', () => {
-  function createWrapper() {
+  beforeEach(() => {
+    document.body.innerHTML = ''
+  })
+
+  function createWrapper(props = {}, slots = {}) {
     return mount(DropDown, {
+      props: {
+        ...props,
+      },
       slots: {
-        trigger: '<button class="my-trigger">Open</button>',
-        default: '<button class="item">Item 1</button>',
+        trigger: slots.trigger || '<button class="my-trigger">Open</button>',
+        default:
+          slots.default ||
+          `<button class="item-1">Item 1</button><button class="item-2">Item 2</button>`,
       },
       attachTo: document.body,
+      global: {
+        stubs: {
+          Teleport: false,
+        },
+      },
     })
   }
 
+  function getMenu() {
+    return document.querySelector('.dropdown-menu')
+  }
+
+  // Basic rendering
   it('should render trigger slot content', () => {
     const wrapper = createWrapper()
     expect(wrapper.find('.my-trigger').exists()).toBe(true)
@@ -23,29 +42,75 @@ describe('DropDown.vue', () => {
   it('should render default slot content in dropdown menu', async () => {
     const wrapper = createWrapper()
     await wrapper.find('.dropdown-trigger').trigger('click')
-    expect(wrapper.find('.dropdown-menu .item').exists()).toBe(true)
-    expect(wrapper.find('.dropdown-menu .item').text()).toBe('Item 1')
+    await flushPromises()
+    const menu = getMenu()
+    expect(menu).not.toBeNull()
+    expect(menu.querySelector('.item-1')).not.toBeNull()
+    expect(menu.querySelector('.item-2')).not.toBeNull()
     wrapper.unmount()
   })
 
+  // Toggle behavior
   it('should toggle dropdown when trigger is clicked', async () => {
     const wrapper = createWrapper()
 
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(false)
+    expect(getMenu()).toBeNull()
 
     await wrapper.find('.dropdown-trigger').trigger('click')
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(true)
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
 
     await wrapper.find('.dropdown-trigger').trigger('click')
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(false)
+    await flushPromises()
+    expect(getMenu()).toBeNull()
     wrapper.unmount()
   })
 
+  // v-model support
+  it('should support v-model (modelValue prop)', async () => {
+    const wrapper = createWrapper({ modelValue: false })
+    expect(getMenu()).toBeNull()
+
+    await wrapper.setProps({ modelValue: true })
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+
+    await wrapper.setProps({ modelValue: false })
+    await flushPromises()
+    expect(getMenu()).toBeNull()
+    wrapper.unmount()
+  })
+
+  it('should emit update:modelValue when toggled internally', async () => {
+    const wrapper = createWrapper()
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(wrapper.emitted('update:modelValue')).toBeTruthy()
+    expect(wrapper.emitted('update:modelValue').slice(-1)[0]).toEqual([true])
+    wrapper.unmount()
+  })
+
+  // Open/Close events
+  it('should emit open and close events', async () => {
+    const wrapper = createWrapper()
+
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(wrapper.emitted('open')).toBeTruthy()
+
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(wrapper.emitted('close')).toBeTruthy()
+    wrapper.unmount()
+  })
+
+  // Outside click
   it('should close dropdown when clicking outside', async () => {
     const wrapper = createWrapper()
 
     await wrapper.find('.dropdown-trigger').trigger('click')
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(true)
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
 
     const outsideEvent = new MouseEvent('click', {
       bubbles: true,
@@ -54,20 +119,36 @@ describe('DropDown.vue', () => {
     document.dispatchEvent(outsideEvent)
     await flushPromises()
 
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(false)
+    expect(getMenu()).toBeNull()
     wrapper.unmount()
   })
 
+  it('should not close when closeOnOutsideClick is false', async () => {
+    const wrapper = createWrapper({ closeOnOutsideClick: false })
+
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+
+    document.dispatchEvent(new MouseEvent('click', { bubbles: true }))
+    await flushPromises()
+
+    expect(getMenu()).not.toBeNull()
+    wrapper.unmount()
+  })
+
+  // Escape key
   it('should close dropdown on Escape key', async () => {
     const wrapper = createWrapper()
 
     await wrapper.find('.dropdown-trigger').trigger('click')
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(true)
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
 
     document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }))
     await flushPromises()
 
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(false)
+    expect(getMenu()).toBeNull()
     wrapper.unmount()
   })
 
@@ -75,21 +156,151 @@ describe('DropDown.vue', () => {
     const wrapper = createWrapper()
 
     await wrapper.find('.dropdown-trigger').trigger('click')
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(true)
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
 
     document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Enter' }))
 
-    expect(wrapper.find('.dropdown-menu').exists()).toBe(true)
+    expect(getMenu()).not.toBeNull()
     wrapper.unmount()
   })
 
+  // Close on select
+  it('should close dropdown when clicking a menu item', async () => {
+    const wrapper = createWrapper()
+
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+
+    const item = getMenu().querySelector('.item-1')
+    item.click()
+    await flushPromises()
+
+    expect(getMenu()).toBeNull()
+    wrapper.unmount()
+  })
+
+  it('should not close on select when closeOnSelect is false', async () => {
+    const wrapper = createWrapper({ closeOnSelect: false })
+
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+
+    const item = getMenu().querySelector('.item-1')
+    item.click()
+    await flushPromises()
+
+    expect(getMenu()).not.toBeNull()
+    wrapper.unmount()
+  })
+
+  // Keyboard navigation on trigger
+  it('should open dropdown on Enter key on trigger', async () => {
+    const wrapper = createWrapper()
+
+    await wrapper.find('.dropdown-trigger').trigger('keydown', { key: 'Enter' })
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+    wrapper.unmount()
+  })
+
+  it('should open dropdown on Space key on trigger', async () => {
+    const wrapper = createWrapper()
+
+    await wrapper.find('.dropdown-trigger').trigger('keydown', { key: ' ' })
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+    wrapper.unmount()
+  })
+
+  it('should open dropdown on ArrowDown key and focus first item', async () => {
+    const wrapper = createWrapper()
+
+    await wrapper.find('.dropdown-trigger').trigger('keydown', { key: 'ArrowDown' })
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+
+    const items = getMenu().querySelectorAll('button:not([disabled])')
+    expect(items.length).toBeGreaterThan(0)
+    expect(document.activeElement).toBe(items[0])
+    wrapper.unmount()
+  })
+
+  // ARIA attributes
+  it('should have correct ARIA attributes on trigger', () => {
+    const wrapper = createWrapper()
+    const trigger = wrapper.find('.dropdown-trigger')
+
+    expect(trigger.attributes('role')).toBe('button')
+    expect(trigger.attributes('tabindex')).toBe('0')
+    expect(trigger.attributes('aria-haspopup')).toBe('true')
+    expect(trigger.attributes('aria-expanded')).toBe('false')
+    wrapper.unmount()
+  })
+
+  it('should update aria-expanded when opened', async () => {
+    const wrapper = createWrapper()
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(wrapper.find('.dropdown-trigger').attributes('aria-expanded')).toBe('true')
+    wrapper.unmount()
+  })
+
+  it('should have role="menu" and aria-hidden on menu', async () => {
+    const wrapper = createWrapper()
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    const menu = getMenu()
+    expect(menu.getAttribute('role')).toBe('menu')
+    expect(menu.getAttribute('aria-hidden')).toBe('false')
+    wrapper.unmount()
+  })
+
+  // Placement class
+  it('should apply placement class', () => {
+    const wrapper = createWrapper({ placement: 'top-start' })
+    expect(wrapper.find('.dropdown').classes()).toContain('placement-top-start')
+    wrapper.unmount()
+  })
+
+  // Disabled item handling
+  it('should not close when clicking disabled item', async () => {
+    const wrapper = mount(DropDown, {
+      slots: {
+        trigger: '<button class="my-trigger">Open</button>',
+        default: '<button disabled class="disabled-item">Disabled</button><button class="item-1">Enabled</button>',
+      },
+      attachTo: document.body,
+      global: {
+        stubs: {
+          Teleport: false,
+        },
+      },
+    })
+
+    await wrapper.find('.dropdown-trigger').trigger('click')
+    await flushPromises()
+    expect(getMenu()).not.toBeNull()
+
+    const disabledItem = getMenu().querySelector('.disabled-item')
+    expect(disabledItem).not.toBeNull()
+    disabledItem.click()
+    await flushPromises()
+
+    expect(getMenu()).not.toBeNull()
+    wrapper.unmount()
+  })
+
+  // Cleanup
   it('should clean up event listeners on unmount', () => {
     const removeSpy = vi.spyOn(document, 'removeEventListener')
 
     const wrapper = createWrapper()
     wrapper.unmount()
 
-    expect(removeSpy).toHaveBeenCalledWith('click', expect.any(Function))
+    expect(removeSpy).toHaveBeenCalledWith('click', expect.any(Function), true)
     expect(removeSpy).toHaveBeenCalledWith('keydown', expect.any(Function))
   })
 })
diff --git a/web/src/components/__tests__/LibraryCard.spec.js b/web/src/components/__tests__/LibraryCard.spec.js
index c9bddb7..30c31eb 100644
--- a/web/src/components/__tests__/LibraryCard.spec.js
+++ b/web/src/components/__tests__/LibraryCard.spec.js
@@ -1,8 +1,12 @@
-import { describe, it, expect } from 'vitest'
-import { mount } from '@vue/test-utils'
+import { describe, it, expect, beforeEach } from 'vitest'
+import { mount, flushPromises } from '@vue/test-utils'
 import LibraryCard from '../LibraryCard.vue'
 
 describe('LibraryCard.vue', () => {
+  beforeEach(() => {
+    document.body.innerHTML = ''
+  })
+
   function setup(props = {}) {
     return mount(LibraryCard, {
       props: {
@@ -10,61 +14,87 @@ describe('LibraryCard.vue', () => {
         name: 'My Library',
         ...props,
       },
+      attachTo: document.body,
+      global: {
+        stubs: {
+          Teleport: false,
+        },
+      },
     })
   }
 
+  function getMenuButtons() {
+    const menu = document.querySelector('.dropdown-menu')
+    return menu ? Array.from(menu.querySelectorAll('button')) : []
+  }
+
   it('should render library name', () => {
     const wrapper = setup()
     expect(wrapper.find('.card-name').text()).toBe('My Library')
+    wrapper.unmount()
   })
 
   it('should render the folder icon', () => {
     const wrapper = setup()
     expect(wrapper.find('.card-icon').exists()).toBe(true)
+    wrapper.unmount()
   })
 
   it('should emit scan event with id when scan button clicked', async () => {
     const wrapper = setup()
 
-    // Need to open dropdown first to reveal buttons
+    // Open dropdown first
     await wrapper.find('.card-menu-btn').trigger('click')
+    await flushPromises()
 
-    const buttons = wrapper.findAll('.dropdown-menu button')
+    const buttons = getMenuButtons()
     // Second button is "扫描"
-    await buttons[1].trigger('click')
+    expect(buttons.length).toBeGreaterThanOrEqual(2)
+    buttons[1].click()
+    await flushPromises()
 
     expect(wrapper.emitted('scan')).toBeTruthy()
     expect(wrapper.emitted('scan')[0]).toEqual([1])
+    wrapper.unmount()
   })
 
   it('should emit delete event with id when delete button clicked', async () => {
     const wrapper = setup()
 
     await wrapper.find('.card-menu-btn').trigger('click')
+    await flushPromises()
 
-    const buttons = wrapper.findAll('.dropdown-menu button')
+    const buttons = getMenuButtons()
     // Third button (type=reset) is "删除"
-    await buttons[2].trigger('click')
+    expect(buttons.length).toBeGreaterThanOrEqual(3)
+    buttons[2].click()
+    await flushPromises()
 
     expect(wrapper.emitted('delete')).toBeTruthy()
     expect(wrapper.emitted('delete')[0]).toEqual([1])
+    wrapper.unmount()
   })
 
   it('should emit viewSongs event with id when view button clicked', async () => {
     const wrapper = setup()
 
     await wrapper.find('.card-menu-btn').trigger('click')
+    await flushPromises()
 
-    const buttons = wrapper.findAll('.dropdown-menu button')
+    const buttons = getMenuButtons()
     // First button is "查看歌曲"
-    await buttons[0].trigger('click')
+    expect(buttons.length).toBeGreaterThanOrEqual(1)
+    buttons[0].click()
+    await flushPromises()
 
     expect(wrapper.emitted('viewSongs')).toBeTruthy()
     expect(wrapper.emitted('viewSongs')[0]).toEqual([1])
+    wrapper.unmount()
   })
 
   it('should render with correct id prop', () => {
     const wrapper = setup({ id: 42 })
     expect(wrapper.props('id')).toBe(42)
+    wrapper.unmount()
   })
 })
diff --git a/web/src/test/setup.js b/web/src/test/setup.js
index 7bb27cf..69f1152 100644
--- a/web/src/test/setup.js
+++ b/web/src/test/setup.js
@@ -54,6 +54,13 @@ class MockAudio {
 
 globalThis.Audio = MockAudio
 
+// Mock ResizeObserver for jsdom
+globalThis.ResizeObserver = class ResizeObserver {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+}
+
 beforeEach(() => {
   setActivePinia(createPinia())
   localStorageMock.clear()