Task 0df715b5: React scaffold, build and serve (#187)

admin/src/App.css

@@ -0,0 +1,70 @@
+/* Shell layout — mobile-first (390x844 reference), plain CubeCraft styling. */
+
+.admin-shell {
+  display: flex;
+  flex-direction: column;
+  min-height: 100%;
+}
+
+.admin-header {
+  background: var(--nq-a-surface);
+  border-bottom: 1px solid var(--nq-a-border);
+  padding: 14px 16px;
+}
+
+.admin-title {
+  margin: 0;
+  font-size: 24px;
+  font-weight: 800;
+  letter-spacing: -0.02em;
+}
+
+.admin-subline {
+  margin: 2px 0 0;
+  font-size: 12px;
+  font-weight: 600;
+  color: var(--nq-a-ink-secondary);
+}
+
+.admin-panel {
+  flex: 1;
+  padding: 14px 16px 92px; /* bottom padding clears the 70px tab bar */
+}
+
+.admin-placeholder {
+  margin: 0;
+  padding: 13px;
+  background: var(--nq-a-surface);
+  border: 1px solid var(--nq-a-border);
+  border-radius: 8px;
+  font-size: 13.5px;
+  font-weight: 600;
+  color: var(--nq-a-ink-secondary);
+}
+
+.admin-tabbar {
+  position: fixed;
+  inset: auto 0 0;
+  display: flex;
+  min-height: calc(var(--nq-a-tabbar-height) + 12px);
+  padding: 8px 4px calc(12px + env(safe-area-inset-bottom));
+  background: var(--nq-a-surface);
+  border-top: 1px solid var(--nq-a-border);
+}
+
+.admin-tab {
+  flex: 1;
+  border: 0;
+  background: none;
+  font-family: inherit;
+  font-size: 12px;
+  font-weight: 600;
+  color: var(--nq-a-ink-secondary);
+  cursor: pointer;
+  padding: 6px 4px;
+}
+
+.admin-tab.active {
+  font-weight: 700;
+  color: var(--nq-brand-blue);
+}