fix: recolour original theme to a cream field with blue text

Use a cream/white background with navy message text and red buttons, so the
original red/white/blue livery presents blue text rather than white text on a
blue field.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

styles.css

@@ -10,7 +10,6 @@
 /* Modern DLR — turquoise/teal */
 [data-theme="modern"] {
   --bg: #00afaa;
-  --bg-accent: #007e7a;
   --surface: #ffffff;
   --text: #ffffff;
   --message: #ffffff;
@@ -20,17 +19,16 @@
   --button-active-text: #ffffff;
 }
 
-/* Original DLR — 1987 red and blue */
+/* Original DLR — 1987 red, white and blue */
 [data-theme="original"] {
-  --bg: #002b5c;
-  --bg-accent: #c8102e;
-  --surface: #f5f0e1;
-  --text: #f5f0e1;
-  --message: #f5f0e1;
+  --bg: #f5f0e1;
+  --surface: #002b5c;
+  --text: #002b5c;
+  --message: #002b5c;
   --button-bg: #c8102e;
   --button-text: #f5f0e1;
-  --button-active-bg: #f5f0e1;
-  --button-active-text: #002b5c;
+  --button-active-bg: #002b5c;
+  --button-active-text: #f5f0e1;
 }
 
 * {
@@ -44,7 +42,7 @@ body {
   flex-direction: column;
   font-family: var(--font-stack);
   color: var(--text);
-  background: linear-gradient(135deg, var(--bg) 0%, var(--bg-accent) 100%);
+  background: var(--bg);
   transition: background 0.4s ease, color 0.4s ease;
 }