Themes: add 'Red' and multi-colour 'Neon 80s' presets

Red mirrors the two-tone Terminal/Vertexic presets (black-on-red day,
red-on-black night). Neon 80s is a synthwave palette that assigns distinct
neon colours (cyan, magenta, violet, green, yellow, red, orange) to the
individual theme items over a dark background, demonstrating that presets
are not limited to two colours.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,7 +7,10 @@ single running list until the first versioned release.
 
 ## Unreleased
 
-_Nothing yet._
+- **Two new theme presets** (Display Options → "Theme"): **Red** (black-on-red
+  day / red-on-black night) and **Neon 80s**, an 80s-synthwave palette that maps
+  several neon colours (cyan, magenta, violet, green, yellow) across the
+  individual UI elements over a dark background.
 
 ## 0.7.1
 

MDUV380_firmware/application/include/hardware/HX8353E.h

@@ -277,6 +277,8 @@ typedef enum
 	THEME_PRESET_BASIC80S,   // Commodore 64 BASIC (light blue on blue)
 	THEME_PRESET_TERMINAL,   // green terminal (green-on-black night / black-on-green day)
 	THEME_PRESET_VERTEXIC,   // amber/orange (black-on-amber day / amber-on-black night)
+	THEME_PRESET_RED,        // red (black-on-red day / red-on-black night)
+	THEME_PRESET_NEON80S,    // 80s synthwave: cyan/magenta/violet/green neon on dark
 	NUM_THEME_PRESETS
 } themePreset_t;
 

MDUV380_firmware/application/source/hardware/HX8353E_display.c

@@ -1530,6 +1530,60 @@ static void themeSetAllItems(DayTime_t daytime, uint32_t fgRGB, uint32_t bgRGB)
 	// THEME_ITEM_BG_MENU_ITEM_SELECTED intentionally left = fg (inverts the selected row).
 }
 
+static void themeSetItem(DayTime_t daytime, themeItem_t item, uint32_t rgb)
+{
+	themeItems[daytime][item] = PLATFORM_COLOUR_FORMAT_SWAP_BYTES(RGB888_TO_PLATFORM_COLOUR_FORMAT(rgb));
+}
+
+// 80s synthwave: a dark background with several neon accents mapped onto the
+// individual UI elements. Both day and night use the same neon palette so the
+// look is preserved; only the background darkens for night.
+static void themeSetNeon80s(DayTime_t daytime, uint32_t bg)
+{
+	const uint32_t cyan    = 0x00F0FF;
+	const uint32_t magenta = 0xFF2CA5;
+	const uint32_t green   = 0x39FF14;
+	const uint32_t violet  = 0xB16CFF;
+	const uint32_t yellow  = 0xFFE600;
+	const uint32_t red     = 0xFF3131;
+	const uint32_t orange  = 0xFF7A18;
+
+	// Base: cyan text on the dark background, everything else overridden below.
+	themeSetAllItems(daytime, cyan, bg);
+
+	themeSetItem(daytime, THEME_ITEM_FG_DECORATION,           magenta); // borders / separators / drop shadow
+	themeSetItem(daytime, THEME_ITEM_FG_TEXT_INPUT,           green);
+	themeSetItem(daytime, THEME_ITEM_FG_SPLASHSCREEN,         magenta);
+
+	themeSetItem(daytime, THEME_ITEM_FG_NOTIFICATION,         cyan);
+	themeSetItem(daytime, THEME_ITEM_FG_WARNING_NOTIFICATION, yellow);
+	themeSetItem(daytime, THEME_ITEM_FG_ERROR_NOTIFICATION,   red);
+
+	themeSetItem(daytime, THEME_ITEM_FG_MENU_NAME,            magenta); // menu header
+	themeSetItem(daytime, THEME_ITEM_BG_MENU_ITEM_SELECTED,   magenta); // selected row = magenta bar
+	themeSetItem(daytime, THEME_ITEM_FG_OPTIONS_VALUE,        green);
+	themeSetItem(daytime, THEME_ITEM_FG_HEADER_TEXT,          violet);  // mode/PWR/battery header
+
+	themeSetItem(daytime, THEME_ITEM_FG_RSSI_BAR,             cyan);
+	themeSetItem(daytime, THEME_ITEM_FG_RSSI_BAR_S9P,         magenta); // over S9 turns hot pink
+
+	themeSetItem(daytime, THEME_ITEM_FG_CHANNEL_NAME,         yellow);
+	themeSetItem(daytime, THEME_ITEM_FG_CHANNEL_CONTACT,      magenta);
+	themeSetItem(daytime, THEME_ITEM_FG_CHANNEL_CONTACT_INFO, cyan);
+	themeSetItem(daytime, THEME_ITEM_FG_ZONE_NAME,            violet);
+
+	themeSetItem(daytime, THEME_ITEM_FG_RX_FREQ,             cyan);
+	themeSetItem(daytime, THEME_ITEM_FG_TX_FREQ,             red);
+	themeSetItem(daytime, THEME_ITEM_FG_CSS_SQL_VALUES,      green);
+	themeSetItem(daytime, THEME_ITEM_FG_TX_COUNTER,         yellow);
+
+	themeSetItem(daytime, THEME_ITEM_FG_POLAR_DRAWING,      violet);
+	themeSetItem(daytime, THEME_ITEM_FG_SATELLITE_COLOUR,   magenta);
+	themeSetItem(daytime, THEME_ITEM_FG_GPS_NUMBER,         cyan);
+	themeSetItem(daytime, THEME_ITEM_FG_GPS_COLOUR,        green);
+	themeSetItem(daytime, THEME_ITEM_FG_BD_COLOUR,        orange);
+}
+
 void themeApplyPreset(uint8_t preset)
 {
 	// Start from the monochrome defaults, then overlay the chosen preset.
@@ -1553,6 +1607,16 @@ void themeApplyPreset(uint8_t preset)
 			themeSetAllItems(NIGHT, 0xFF6A00, 0x000000); // orange on black
 			break;
 
+		case THEME_PRESET_RED:
+			themeSetAllItems(DAY,   0x000000, 0xFF0000); // black on red
+			themeSetAllItems(NIGHT, 0xFF0000, 0x000000); // red on black
+			break;
+
+		case THEME_PRESET_NEON80S: // 80s synthwave neon on dark
+			themeSetNeon80s(DAY,   0x1B0B2E); // dark indigo
+			themeSetNeon80s(NIGHT, 0x08040F); // near-black purple
+			break;
+
 		case THEME_PRESET_CUSTOM:
 		default:
 			// Overlay the user's Custom theme from the codeplug, if present (CPS edits

MDUV380_firmware/application/source/user_interface/menuDisplayOptions.c

@@ -276,7 +276,7 @@ static void updateScreen(bool isFirstRun)
 				case DISPLAY_THEME_PRESET:
 					{
 						// Preset names are plain literals -> rightSideVar (voice-safe).
-						const char *presetNames[] = { "Custom", "BASIC 80s", "Terminal", "Vertexic" };
+						const char *presetNames[] = { "Custom", "BASIC 80s", "Terminal", "Vertexic", "Red", "Neon 80s" };
 						uint8_t p = themeGetPreset();
 						leftSide = "Theme";
 						snprintf(rightSideVar, SCREEN_LINE_BUFFER_SIZE, "%s", presetNames[(p < NUM_THEME_PRESETS) ? p : 0]);