Managing Modals and Overlays with Vue 3's Teleport Feature

// Modal.vue
<template>
  <Teleport to="body">
    <div v-if="show" class="modal-backdrop" @click.self="closeModal">
      <div class="modal-content">
        <header class="modal-header">
          <h3>{{ title }}</h3>
          <button class="close-button" @click="closeModal">×</button>
        </header>
        <div class="modal-body">
          <slot></slot>
        </div>
        <footer class="modal-footer">
          <slot name="footer">
            <button @click="closeModal">Close</button>
          </slot>
        </footer>
      </div>
    </div>
  </Teleport>
</template>

<script setup>
import { defineProps, defineEmits } from 'vue';

const props = defineProps({
  show: Boolean,
  title: {
    type: String,
    default: 'Modal Title',
  },
});

const emit = defineEmits(['close']);

function closeModal() {
  emit('close');
}
</script>

<style scoped>
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: white;
  padding: 20px;
  border-radius: 8px;
  min-width: 300px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  border-bottom: 1px solid #eee;
  padding-bottom: 10px;
}

.modal-header h3 {
  margin: 0;
}

.close-button {
  background: none;
  border: none;
  font-size: 1.5em;
  cursor: pointer;
  color: #aaa;
}

.modal-footer {
  margin-top: 20px;
  border-top: 1px solid #eee;
  padding-top: 10px;
  text-align: right;
}
</style>

// App.vue (Parent component usage)
<template>
  <div>
    <h1>My App Content</h1>
    <button @click="showModal = true">Open Modal</button>

    <Modal :show="showModal" title="Important Message" @close="showModal = false">
      <p>This is the content of my custom modal. It's teleported!</p>
      <p>Any content placed here will appear in the modal body.</p>
      <template #footer>
        <button @click="handleConfirm">Confirm</button>
        <button @click="showModal = false">Cancel</button>
      </template>
    </Modal>
  </div>
</template>

<script setup>
import { ref } from 'vue';
import Modal from './Modal.vue';

const showModal = ref(false);

function handleConfirm() {
  alert('Confirmed!');
  showModal.value = false;
}
</script>