apply specific color to placeholders

Author: LFDanLu

packages/@react-spectrum/s2/src/Field.tsx

@@ -231,7 +231,10 @@ export const Input = forwardRef(function Input(props: InputProps, ref: Forwarded
       className={UNSAFE_className + mergeStyles(style({
         padding: 0,
         backgroundColor: 'transparent',
-        color: 'inherit',
+        color: {
+          default: 'inherit',
+          '::placeholder': 'gray-600'
+        },
         fontFamily: 'inherit',
         fontSize: 'inherit',
         fontWeight: 'inherit',

packages/@react-spectrum/s2/src/TextField.tsx

@@ -201,7 +201,10 @@ function TextAreaInput() {
         minHeight: controlSize(),
         boxSizing: 'border-box',
         backgroundColor: 'transparent',
-        color: 'inherit',
+        color: {
+          default: 'inherit',
+          '::placeholder': 'gray-600'
+        },
         fontFamily: 'inherit',
         fontSize: 'inherit',
         fontWeight: 'inherit',