Refactored frontend directory

frontend/src/layout/ChildLayout.vue

@@ -0,0 +1,123 @@
+<template>
+  <div class="layout-root">
+    <header class="topbar">
+      <div class="end-button-container">
+        <button v-show="showBack" class="back-btn" @click="handleBack" tabindex="0">← Back</button>
+      </div>
+      <div class="spacer"></div>
+      <div class="end-button-container">
+        <LoginButton />
+      </div>
+    </header>
+    <main class="main-content">
+      <router-view />
+    </main>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { useRouter, useRoute } from 'vue-router'
+import { computed } from 'vue'
+import LoginButton from '../components/shared/LoginButton.vue'
+
+const router = useRouter()
+const route = useRoute()
+
+const handleBack = () => {
+  if (window.history.length > 1) {
+    router.back()
+  } else {
+    router.push('/child')
+  }
+}
+
+const showBack = computed(() => route.path !== '/child')
+</script>
+
+<style scoped>
+.layout-root {
+  width: 100%;
+  min-height: 100vh;
+  height: 100vh;
+  display: flex;
+  flex-direction: column;
+  padding: 0;
+  background: var(--header-bg, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
+}
+
+.topbar {
+  display: flex;
+  align-items: stretch;
+  padding: 0;
+  height: 48px;
+  width: 100%;
+  box-sizing: border-box;
+}
+
+.end-button-container {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 65px;
+  min-width: 65px;
+  max-width: 65px;
+  height: 48px;
+  min-height: 48px;
+  max-height: 48px;
+  margin-left: 5px;
+  margin-right: 5px;
+  box-sizing: border-box;
+}
+
+.back-btn {
+  width: 65px;
+  min-width: 65px;
+  max-width: 65px;
+  height: 48px;
+  min-height: 48px;
+  max-height: 48px;
+  margin: 0;
+  background: var(--button-bg, #fff);
+  border: 0;
+  border-radius: 8px 8px 0 0;
+  cursor: pointer;
+  color: var(--button-text, #667eea);
+  font-weight: 600;
+  font-size: 0.8rem;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-sizing: border-box;
+  overflow: hidden;
+  padding: 0;
+  transition:
+    background 0.18s,
+    color 0.18s;
+}
+
+@media (max-width: 480px) {
+  .back-btn {
+    font-size: 0.7rem;
+  }
+}
+
+.spacer {
+  flex: 1 1 auto;
+  height: 100%;
+  display: flex;
+  align-items: center;
+}
+
+.main-content {
+  flex: 1 1 auto;
+  width: 100%;
+  justify-content: center;
+  align-items: flex-start;
+  box-sizing: border-box;
+  min-height: 0;
+  height: 0;
+  overflow: hidden;
+  overflow-y: visible;
+  padding: 1rem;
+}
+</style>