Always-visible app title: white text + drop shadow on masthead h1/tagline

app/public/style.css

@@ -139,14 +139,19 @@ a:hover { text-decoration: underline; }
   font-size: 1.7rem;
   letter-spacing: -0.3px;
   margin-bottom: 0.35rem;
+  color: #fff;
+  text-shadow:
+    0 1px 3px rgba(0,0,0,0.55),
+    0 2px 8px rgba(0,0,0,0.35);
 }
 
 .tagline {
   display: block;
   margin-top: 0.35rem;
   font-size: 0.76rem;
-  color: var(--ink-muted);
+  color: rgba(255,255,255,0.75);
   letter-spacing: 0.04em;
+  text-shadow: 0 1px 3px rgba(0,0,0,0.45);
 }
 
 /* Bottom nav */