Add new GUI themes and update documentation.

- Amber
- LCARS
- Orbital
- Weyland-Yutani
- Kanagawa Paper (dark mode extension)

Update help text to reflect additions.

themes/KanagawaPaper.h

@@ -5,7 +5,7 @@
 // Expects to be included from GUITheme.h after <imgui.h> and RGBA() helper
 
 static void
-ApplyKanagawaPaperTheme()
+ApplyKanagawaPaperLightTheme()
 {
 	// Approximate Kanagawa Paper (light) palette
 	const ImVec4 bg0 = RGBA(0xF2EAD3); // paper
@@ -102,4 +102,105 @@ ApplyKanagawaPaperTheme()
 	colors[ImGuiCol_PlotLinesHovered]      = blue;
 	colors[ImGuiCol_PlotHistogram]         = yellow;
 	colors[ImGuiCol_PlotHistogramHovered]  = orange;
+}
+
+
+static void
+ApplyKanagawaPaperDarkTheme()
+{
+	// Approximate Kanagawa (dark) with paper-inspired warmth
+	const ImVec4 bg0 = RGBA(0x1F1E1A); // deep warm black
+	const ImVec4 bg1 = RGBA(0x25241F);
+	const ImVec4 bg2 = RGBA(0x2E2C26);
+	const ImVec4 bg3 = RGBA(0x3A372F);
+	const ImVec4 fg0 = RGBA(0xDCD7BA); // warm ivory ink (kanagawa fg)
+	const ImVec4 fg1 = RGBA(0xC8C093);
+
+	// Accents similar to kanagawa-wave
+	const ImVec4 teal   = RGBA(0x7AA89F);
+	const ImVec4 orange = RGBA(0xFFA066);
+	const ImVec4 blue   = RGBA(0x7E9CD8);
+	const ImVec4 yellow = RGBA(0xE6C384);
+
+	ImGuiStyle &style      = ImGui::GetStyle();
+	style.WindowPadding    = ImVec2(8.0f, 8.0f);
+	style.FramePadding     = ImVec2(6.0f, 4.0f);
+	style.CellPadding      = ImVec2(6.0f, 4.0f);
+	style.ItemSpacing      = ImVec2(6.0f, 6.0f);
+	style.ItemInnerSpacing = ImVec2(6.0f, 4.0f);
+	style.ScrollbarSize    = 14.0f;
+	style.GrabMinSize      = 10.0f;
+	style.WindowRounding   = 4.0f;
+	style.FrameRounding    = 3.0f;
+	style.PopupRounding    = 4.0f;
+	style.GrabRounding     = 3.0f;
+	style.TabRounding      = 4.0f;
+	style.WindowBorderSize = 1.0f;
+	style.FrameBorderSize  = 1.0f;
+
+	ImVec4 *c                         = style.Colors;
+	c[ImGuiCol_Text]                  = fg0;
+	c[ImGuiCol_TextDisabled]          = ImVec4(fg1.x, fg1.y, fg1.z, 0.6f);
+	c[ImGuiCol_WindowBg]              = bg0;
+	c[ImGuiCol_ChildBg]               = bg0;
+	c[ImGuiCol_PopupBg]               = ImVec4(bg1.x, bg1.y, bg1.z, 0.98f);
+	c[ImGuiCol_Border]                = bg2;
+	c[ImGuiCol_BorderShadow]          = RGBA(0x000000, 0.0f);
+	c[ImGuiCol_FrameBg]               = bg2;
+	c[ImGuiCol_FrameBgHovered]        = bg3;
+	c[ImGuiCol_FrameBgActive]         = bg1;
+	c[ImGuiCol_TitleBg]               = bg1;
+	c[ImGuiCol_TitleBgActive]         = bg2;
+	c[ImGuiCol_TitleBgCollapsed]      = bg1;
+	c[ImGuiCol_MenuBarBg]             = bg1;
+	c[ImGuiCol_ScrollbarBg]           = bg0;
+	c[ImGuiCol_ScrollbarGrab]         = bg3;
+	c[ImGuiCol_ScrollbarGrabHovered]  = bg2;
+	c[ImGuiCol_ScrollbarGrabActive]   = bg1;
+	c[ImGuiCol_CheckMark]             = teal;
+	c[ImGuiCol_SliderGrab]            = teal;
+	c[ImGuiCol_SliderGrabActive]      = blue;
+	c[ImGuiCol_Button]                = bg3;
+	c[ImGuiCol_ButtonHovered]         = bg2;
+	c[ImGuiCol_ButtonActive]          = bg1;
+	c[ImGuiCol_Header]                = bg3;
+	c[ImGuiCol_HeaderHovered]         = bg2;
+	c[ImGuiCol_HeaderActive]          = bg2;
+	c[ImGuiCol_Separator]             = bg2;
+	c[ImGuiCol_SeparatorHovered]      = bg1;
+	c[ImGuiCol_SeparatorActive]       = teal;
+	c[ImGuiCol_ResizeGrip]            = ImVec4(fg1.x, fg1.y, fg1.z, 0.15f);
+	c[ImGuiCol_ResizeGripHovered]     = ImVec4(teal.x, teal.y, teal.z, 0.67f);
+	c[ImGuiCol_ResizeGripActive]      = blue;
+	c[ImGuiCol_Tab]                   = bg2;
+	c[ImGuiCol_TabHovered]            = bg1;
+	c[ImGuiCol_TabActive]             = bg3;
+	c[ImGuiCol_TabUnfocused]          = bg2;
+	c[ImGuiCol_TabUnfocusedActive]    = bg3;
+	c[ImGuiCol_TableHeaderBg]         = bg2;
+	c[ImGuiCol_TableBorderStrong]     = bg1;
+	c[ImGuiCol_TableBorderLight]      = ImVec4(bg1.x, bg1.y, bg1.z, 0.6f);
+	c[ImGuiCol_TableRowBg]            = ImVec4(bg1.x, bg1.y, bg1.z, 0.12f);
+	c[ImGuiCol_TableRowBgAlt]         = ImVec4(bg1.x, bg1.y, bg1.z, 0.22f);
+	c[ImGuiCol_TextSelectedBg]        = ImVec4(orange.x, orange.y, orange.z, 0.28f);
+	c[ImGuiCol_DragDropTarget]        = orange;
+	c[ImGuiCol_NavHighlight]          = orange;
+	c[ImGuiCol_NavWindowingHighlight] = ImVec4(fg1.x, fg1.y, fg1.z, 0.70f);
+	c[ImGuiCol_NavWindowingDimBg]     = ImVec4(0.0f, 0.0f, 0.0f, 0.35f);
+	c[ImGuiCol_ModalWindowDimBg]      = ImVec4(0.0f, 0.0f, 0.0f, 0.35f);
+	c[ImGuiCol_PlotLines]             = teal;
+	c[ImGuiCol_PlotLinesHovered]      = blue;
+	c[ImGuiCol_PlotHistogram]         = yellow;
+	c[ImGuiCol_PlotHistogramHovered]  = orange;
+}
+
+
+// Back-compat name kept; select by global background
+static inline void
+ApplyKanagawaPaperTheme()
+{
+	if (GetBackgroundMode() == BackgroundMode::Dark)
+		ApplyKanagawaPaperDarkTheme();
+	else
+		ApplyKanagawaPaperLightTheme();
 }