Fix placeholder colors for inputs not being explicitly defined (#11890)

Fix #11841

app/javascript/styles/mastodon/_mixins.scss

@@ -22,24 +22,6 @@
   color: $darker-text-color;
   font-size: 14px;
   margin: 0;
-
-  &::-moz-focus-inner {
-    border: 0;
-  }
-
-  &::-moz-focus-inner,
-  &:focus,
-  &:active {
-    outline: 0 !important;
-  }
-
-  &:focus {
-    background: lighten($ui-base-color, 4%);
-  }
-
-  @media screen and (max-width: 600px) {
-    font-size: 16px;
-  }
 }
 
 @mixin search-popout {

app/javascript/styles/mastodon/components.scss

@@ -421,6 +421,10 @@
     border: 0;
     outline: 0;
 
+    &::placeholder {
+      color: $dark-text-color;
+    }
+
     &:focus {
       outline: 0;
     }
@@ -3533,6 +3537,28 @@ a.status-card.compact:hover {
   .column-select {
     &__control {
       @include search-input;
+
+      &::placeholder {
+        color: lighten($darker-text-color, 4%);
+      }
+
+      &::-moz-focus-inner {
+        border: 0;
+      }
+
+      &::-moz-focus-inner,
+      &:focus,
+      &:active {
+        outline: 0 !important;
+      }
+
+      &:focus {
+        background: lighten($ui-base-color, 4%);
+      }
+
+      @media screen and (max-width: 600px) {
+        font-size: 16px;
+      }
     }
 
     &__placeholder {
@@ -4046,6 +4072,28 @@ a.status-card.compact:hover {
   padding-right: 30px;
   line-height: 18px;
   font-size: 16px;
+
+  &::placeholder {
+    color: lighten($darker-text-color, 4%);
+  }
+
+  &::-moz-focus-inner {
+    border: 0;
+  }
+
+  &::-moz-focus-inner,
+  &:focus,
+  &:active {
+    outline: 0 !important;
+  }
+
+  &:focus {
+    background: lighten($ui-base-color, 4%);
+  }
+
+  @media screen and (max-width: 600px) {
+    font-size: 16px;
+  }
 }
 
 .search__icon {

app/javascript/styles/mastodon/forms.scss

@@ -338,6 +338,10 @@ code {
     border-radius: 4px;
     padding: 10px;
 
+    &::placeholder {
+      color: lighten($darker-text-color, 4%);
+    }
+
     &:invalid {
       box-shadow: none;
     }