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<template>
  <div class="loading-container" :class="{ overlay: overlay }">
    <div class="loading-content">
      <!-- 加载动画 -->
      <div class="loading-spinner" :class="size">
        <div v-for="i in 12" :key="i" class="spinner-bar" :style="{ '--delay': `${i * 0.1}s` }"></div>
      </div>
      
      <!-- 加载文本 -->
      <div v-if="text" class="loading-text">{{ text }}</div>
    </div>
  </div>
</template>

<script setup>
defineProps({
  // 是否显示遮罩层
  overlay: {
    type: Boolean,
    default: false
  },
  
  // 加载提示文字
  text: {
    type: String,
    default: ''
  },
  
  // 大小：small, medium, large
  size: {
    type: String,
    default: 'medium',
    validator: (value) => ['small', 'medium', 'large'].includes(value)
  }
})
</script>

<style scoped>
.loading-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.loading-container.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 9999;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loading-spinner {
  position: relative;
  display: inline-block;
}

.loading-spinner.small {
  width: 20px;
  height: 20px;
}

.loading-spinner.medium {
  width: 32px;
  height: 32px;
}

.loading-spinner.large {
  width: 48px;
  height: 48px;
}

.spinner-bar {
  position: absolute;
  width: 2px;
  height: 25%;
  background: var(--accent-red);
  border-radius: 1px;
  opacity: 0;
  animation: spin 1.2s linear infinite;
  animation-delay: var(--delay);
  transform-origin: 50% 200%;
}

.spinner-bar:nth-child(1) { transform: rotate(0deg); }
.spinner-bar:nth-child(2) { transform: rotate(30deg); }
.spinner-bar:nth-child(3) { transform: rotate(60deg); }
.spinner-bar:nth-child(4) { transform: rotate(90deg); }
.spinner-bar:nth-child(5) { transform: rotate(120deg); }
.spinner-bar:nth-child(6) { transform: rotate(150deg); }
.spinner-bar:nth-child(7) { transform: rotate(180deg); }
.spinner-bar:nth-child(8) { transform: rotate(210deg); }
.spinner-bar:nth-child(9) { transform: rotate(240deg); }
.spinner-bar:nth-child(10) { transform: rotate(270deg); }
.spinner-bar:nth-child(11) { transform: rotate(300deg); }
.spinner-bar:nth-child(12) { transform: rotate(330deg); }

@keyframes spin {
  0%, 40%, 100% {
    opacity: 0.3;
  }
  20% {
    opacity: 1;
  }
}

.loading-text {
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  font-weight: 500;
}

/* 响应式 */
@media (max-width: 375px) {
  .loading-container {
    padding: 16px;
  }
  
  .loading-content {
    gap: 12px;
  }
  
  .loading-text {
    font-size: 13px;
  }
}
</style>