Revise colours for deadlines and scheduled tasks

The goal is two-fold:

1. Improve the semantics of relevant faces. This now covers the Org
   agenda. We want pending/urgent tasks to be rendered in a bold font
   and use a vivid colour. Whereas tasks that are not urgent should
   have a subtle colour and a normal weight. Thanks to Adam
   Porter (GitHub @alphapapa) for discussing this with me in issue
   102: <#102>.

2. Make the applicable colours be more consistent with the rest of the
   theme. In practice, this means that the colour values are cooler
   overall and the intensity is lower.

modus-operandi-deuteranopia-theme.el

@@ -304,14 +304,16 @@ standard)."
 
       (date-common cyan)
       (date-deadline yellow-warmer)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
       (date-holiday yellow-warmer)
       (date-holiday-other blue)
       (date-now fg-main)
       (date-range fg-alt)
       (date-scheduled yellow-cooler)
+      (date-scheduled-subtle yellow-faint)
       (date-weekday cyan)
-      (date-weekend yellow-faint)
+      (date-weekend magenta)
 
 ;;;; Line number mappings
 

modus-operandi-theme.el

@@ -301,15 +301,17 @@ which corresponds to a minimum contrast in relative luminance of
 ;;;; Date mappings
 
       (date-common cyan)
-      (date-deadline red)
+      (date-deadline red-cooler)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
-      (date-holiday red-cooler)
+      (date-holiday red)
       (date-holiday-other blue)
       (date-now fg-main)
       (date-range fg-alt)
-      (date-scheduled yellow-warmer)
+      (date-scheduled yellow)
+      (date-scheduled-subtle yellow-faint)
       (date-weekday cyan)
-      (date-weekend red-faint)
+      (date-weekend magenta)
 
 ;;;; Line number mappings
 

modus-operandi-tinted-theme.el

@@ -301,15 +301,17 @@ which corresponds to a minimum contrast in relative luminance of
 ;;;; Date mappings
 
       (date-common cyan)
-      (date-deadline red)
+      (date-deadline red-cooler)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
-      (date-holiday red-cooler)
+      (date-holiday red)
       (date-holiday-other blue)
       (date-now fg-main)
       (date-range fg-alt)
-      (date-scheduled yellow-warmer)
+      (date-scheduled yellow)
+      (date-scheduled-subtle yellow-faint)
       (date-weekday cyan)
-      (date-weekend red-faint)
+      (date-weekend magenta)
 
 ;;;; Line number mappings
 

modus-operandi-tritanopia-theme.el

@@ -304,14 +304,16 @@ standard)."
 
       (date-common cyan-cooler)
       (date-deadline red)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
       (date-holiday red)
       (date-holiday-other cyan)
       (date-now fg-main)
       (date-range fg-alt)
       (date-scheduled magenta)
+      (date-scheduled-subtle magenta-faint)
       (date-weekday cyan)
-      (date-weekend red-faint)
+      (date-weekend magenta-warmer)
 
 ;;;; Line number mappings
 

modus-themes.el

@@ -3300,7 +3300,7 @@ FG and BG are the main colors."
     `(org-headline-todo ((,c :inherit org-todo)))
     `(org-hide ((,c :foreground ,bg-main)))
     `(org-indent ((,c :inherit (fixed-pitch org-hide))))
-    `(org-imminent-deadline ((,c :inherit modus-themes-bold :foreground ,date-deadline)))
+    `(org-imminent-deadline ((,c :inherit bold :foreground ,date-deadline)))
     `(org-latex-and-related ((,c :foreground ,type)))
     `(org-level-1 ((,c :inherit modus-themes-heading-1)))
     `(org-level-2 ((,c :inherit modus-themes-heading-2)))
@@ -3319,9 +3319,9 @@ FG and BG are the main colors."
     `(org-priority ((,c :foreground ,prose-tag)))
     `(org-property-value ((,c :inherit modus-themes-fixed-pitch :foreground ,prose-metadata-value)))
     `(org-quote ((,c :inherit org-block)))
-    `(org-scheduled ((,c :foreground ,date-scheduled)))
-    `(org-scheduled-previously ((,c :inherit org-scheduled)))
-    `(org-scheduled-today ((,c :inherit (modus-themes-bold org-scheduled))))
+    `(org-scheduled ((,c :foreground ,date-scheduled-subtle)))
+    `(org-scheduled-previously ((,c :inherit (bold org-scheduled-today))))
+    `(org-scheduled-today ((,c :foreground ,date-scheduled)))
     `(org-sexp-date ((,c :foreground ,date-common)))
     `(org-special-keyword ((,c :inherit org-drawer)))
     `(org-table ((,c :inherit modus-themes-fixed-pitch :foreground ,prose-table)))
@@ -3331,8 +3331,8 @@ FG and BG are the main colors."
     `(org-target ((,c :underline t)))
     `(org-time-grid ((,c :foreground ,fg-dim)))
     `(org-todo ((,c :foreground ,prose-todo)))
-    `(org-upcoming-deadline ((,c :foreground ,date-deadline)))
-    `(org-upcoming-distant-deadline ((,c :inherit org-upcoming-deadline)))
+    `(org-upcoming-deadline ((,c :foreground ,date-deadline-subtle)))
+    `(org-upcoming-distant-deadline ((,c :foreground ,fg-main)))
     `(org-verbatim ((,c :inherit modus-themes-prose-verbatim)))
     `(org-verse ((,c :inherit org-block)))
     `(org-warning ((,c :inherit warning)))

modus-vivendi-deuteranopia-theme.el

@@ -304,14 +304,16 @@ standard)."
 
       (date-common cyan)
       (date-deadline yellow-warmer)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
       (date-holiday yellow-warmer)
       (date-holiday-other blue)
       (date-now fg-main)
       (date-range fg-alt)
       (date-scheduled yellow-cooler)
+      (date-scheduled-subtle yellow-faint)
       (date-weekday cyan)
-      (date-weekend yellow-faint)
+      (date-weekend magenta)
 
 ;;;; Line number mappings
 

modus-vivendi-theme.el

@@ -301,15 +301,17 @@ which corresponds to a minimum contrast in relative luminance of
 ;;;; Date mappings
 
       (date-common cyan)
-      (date-deadline red)
+      (date-deadline red-cooler)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
-      (date-holiday red-cooler)
+      (date-holiday magenta-warmer)
       (date-holiday-other blue)
       (date-now fg-main)
       (date-range fg-alt)
-      (date-scheduled yellow-warmer)
+      (date-scheduled yellow-cooler)
+      (date-scheduled-subtle yellow-faint)
       (date-weekday cyan)
-      (date-weekend red-faint)
+      (date-weekend magenta)
 
 ;;;; Line number mappings
 

modus-vivendi-tinted-theme.el

@@ -301,15 +301,17 @@ which corresponds to a minimum contrast in relative luminance of
 ;;;; Date mappings
 
       (date-common cyan)
-      (date-deadline red)
+      (date-deadline red-cooler)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
-      (date-holiday red-cooler)
+      (date-holiday magenta-warmer)
       (date-holiday-other blue)
       (date-now fg-main)
       (date-range fg-alt)
-      (date-scheduled yellow-warmer)
+      (date-scheduled yellow-cooler)
+      (date-scheduled-subtle yellow-faint)
       (date-weekday cyan)
-      (date-weekend red-faint)
+      (date-weekend magenta)
 
 ;;;; Line number mappings
 

modus-vivendi-tritanopia-theme.el

@@ -304,14 +304,16 @@ standard)."
 
       (date-common cyan-cooler)
       (date-deadline red)
+      (date-deadline-subtle red-faint)
       (date-event fg-alt)
       (date-holiday red-intense)
       (date-holiday-other cyan-warmer)
       (date-now fg-main)
       (date-range fg-alt)
       (date-scheduled magenta)
+      (date-scheduled-subtle magenta-faint)
       (date-weekday cyan)
-      (date-weekend red-faint)
+      (date-weekend magenta-warmer)
 
 ;;;; Line number mappings