First commit

frontend/app/assets/css/_transitions.scss

@@ -0,0 +1,10 @@
+// ---------- Nuxt route transitions ----------
+.fade-enter-active, .fade-leave-active { transition: opacity 0.16s ease; }
+
+.fade-enter-from, .fade-leave-to { opacity: 0; }
+
+// shared between the plain pages — the reader doesn't use it: its pages
+// move inside the open book (see .book-pane in _book.scss)
+.page-enter-active, .page-leave-active { transition: opacity 0.16s ease; }
+
+.page-enter-from, .page-leave-to { opacity: 0; }