initial commit

web/vue-app/src/layout/ChildLayout.vue

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+<script setup lang="ts">
+import { useRouter, useRoute } from 'vue-router'
+import { computed } from 'vue'
+import LoginButton from '../components/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>
+
+<template>
+  <div class="layout-root">
+    <header class="topbar">
+      <div class="topbar-inner">
+        <button v-if="showBack" class="back-btn" @click="handleBack">← Back</button>
+        <div class="spacer"></div>
+        <LoginButton />
+      </div>
+    </header>
+    <main class="main-content">
+      <router-view />
+    </main>
+  </div>
+</template>
+
+<style scoped>
+.layout-root {
+  width: 100%;
+  box-sizing: border-box;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+
+  /* Reduce top padding */
+  padding: 0.5rem 2rem 2rem 2rem;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+}
+
+/* top bar holds login button at top-right */
+.topbar {
+  width: 100%;
+  padding: 12px 20px;
+  box-sizing: border-box;
+  display: flex;
+  justify-content: center;
+}
+
+.topbar-inner {
+  width: 100%;
+  max-width: 1200px;
+  display: flex;
+  align-items: center;
+}
+
+/* spacer pushes button to the right */
+.spacer {
+  flex: 1;
+}
+
+/* main content remains centered */
+.main-content {
+  width: 100%;
+  display: flex;
+  justify-content: center;
+  align-items: flex-start; /* content starts higher */
+  box-sizing: border-box;
+
+  /* Reduce top padding */
+  padding: 4px 20px 40px;
+}
+
+/* back button style */
+.back-btn {
+  background: white;
+  border: 0;
+  padding: 0.6rem 1rem;
+  border-radius: 8px;
+  cursor: pointer;
+  margin-bottom: 0;
+  color: #667eea;
+  font-weight: 600;
+  margin-top: 0;
+}
+
+.back-btn:hover {
+  background-color: #764ba2;
+}
+
+@media (max-width: 480px) {
+  .back-btn {
+    padding: 0.45rem 0.75rem;
+    font-size: 0.95rem;
+    margin-bottom: 0.7rem;
+  }
+}
+</style>