Adjust crimson theme color combinations

Spine action items - default #d7dadb, hover #fff
 Offsite links to #d7dadb, hover #fff, always show the offsite icon
 Mobile menu button #d7dadb
 List item border-color: #81192a

See #353

styles/sass/spine/_colors.scss

@@ -401,13 +401,36 @@
 			background-color: $crimson;
 		}
 
+		#shelve,
+		#shelve::before,
+		#shelve::after {
+			color: $gray-lightly;
+		}
+
 		@include vellum($crimson);
 
 		.spine-sitenav a {
 			color: $gray-lighter;
 		}
 
-		.spine-actions-tabs button,
+		.spine-actions button,
+		.spine-offsitenav a {
+			color: $gray-lightly;
+		}
+
+		.spine-actions-tabs button:focus,
+		.spine-actions-tabs button:hover,
+		.spine-offsitenav a:focus,
+		.spine-offsitenav a:hover {
+			color: white;
+		}
+
+		.spine-actions .opened button,
+		.spine-actions .opened button:focus,
+		.spine-actions .opened button:hover {
+			color: $gray-darker;
+		}
+
 		.spine-social-channels a,
 		.spine-footer small a {
 			color: $crimson-dark;
@@ -416,20 +439,14 @@
 
 		.spine-sitenav ul li,
 		.spine-global-links {
-			border-color: $crimson-dark;
+			border-color: #81192a;
 		}
 
-		.spine-offsitenav a,
 		.spine-global-links a {
 			color: darken($crimson-darkest,6%);
 			color: black;
 		}
 
-		.spine-search-tab:not(.opened) button:focus,
-		.spine-search-tab:not(.opened) button:hover,
-		.spine-actions-tabs :not(.opened) button:focus,
-		.spine-actions-tabs :not(.opened) button:hover,
-		.spine-offsitenav a:hover,
 		.spine-global-links a:hover {
 			color: black;
 			color: $crimson-darkest;
@@ -439,10 +456,6 @@
 			color: $crimson-darkest !important;
 		}
 
-		.spine-search-tab:not(.opened) button {
-			color: darken($crimson-darkest,10%);
-		}
-
 		.spine-sitenav a:hover,
 		.spine-sitenav li.dogeared > a {
 			color: white;