Add Sublime Text specific CSS

Package/Sublime CSS/Sublime CSS (for JSON).sublime-syntax

@@ -0,0 +1,15 @@
+%YAML 1.2
+---
+# https://www.sublimetext.com/docs/syntax.html
+scope: source.css.sublime.json-string
+version: 2
+hidden: true
+
+extends: Sublime CSS.sublime-syntax
+
+contexts:
+  prototype:
+    - meta_prepend: true
+    - include: Sublime JSON.sublime-syntax#string-escape
+    - match: $|(?=")
+      pop: 1

Package/Sublime CSS/Sublime CSS.sublime-syntax

@@ -0,0 +1,158 @@
+%YAML 1.2
+---
+# https://www.sublimetext.com/docs/syntax.html
+scope: source.css.sublime
+version: 2
+hidden: true
+
+extends: Packages/CSS/CSS.sublime-syntax
+
+contexts:
+
+  stylesheet:
+    # Note: ST doesn't support at-rules
+    - include: comments
+    - include: selectors
+    - include: property-lists
+    - include: rule-terminators
+    - include: illegal-commas
+    - include: illegal-groups
+
+  at-rules: []
+  nested-at-rules: []
+
+  property-list-body:
+    # Note: ST doesn't support nested selectors
+    - meta_include_prototype: false
+    - meta_scope: meta.property-list.css meta.block.css
+    - match: '{{block_end}}'
+      scope: punctuation.section.block.end.css
+      pop: 1
+    - include: comments
+    - include: property-identifiers
+    - include: property-values
+    - include: rule-terminators
+    - include: illegal-commas
+    - include: illegal-blocks
+    - include: illegal-groups
+
+###[ BUILTIN FUNCTIONS ]#######################################################
+
+  builtin-functions:
+    # Note: ST only supports a limited subset of CSS functions
+    - include: color-adjuster-functions
+
+###[ COLOR FUNCTIONS ]#########################################################
+
+  color-functions:
+    - meta_prepend: true
+    # proprietary color function supported by Sublime Text
+    - match: \b((?i:min-contrast))(\()
+      captures:
+        1: meta.function-call.identifier.css support.function.css
+        2: meta.function-call.arguments.css meta.group.css punctuation.section.group.begin.css
+      push: color-function-argument-list-body
+
+  color-function-argument-list-body:
+    - meta_content_scope: meta.function-call.arguments.css meta.group.css
+    - match: \)
+      scope: meta.function-call.arguments.css meta.group.css punctuation.section.group.end.css
+      pop: 1
+    - include: var-functions
+    - include: color-adjuster-functions
+    - include: color-values
+    - include: none-constants
+    - include: numeric-constants
+    - include: sublime-color-variables
+    - include: other-constants
+
+  color-adjuster-functions:
+    # color adjuster functions supported by Sublime Text
+    - match: \b((?i:blenda?|alpha|saturation|lightness|[asl]))(\()
+      captures:
+        1: meta.function-call.identifier.css support.function.css
+        2: meta.function-call.arguments.css meta.group.css punctuation.section.group.begin.css
+      push: color-adjuster-function-argument-list-body
+
+  color-adjuster-function-argument-list-body:
+    - meta_content_scope: meta.function-call.arguments.css meta.group.css
+    - match: \)
+      scope: meta.function-call.arguments.css meta.group.css punctuation.section.group.end.css
+      pop: 1
+    - include: var-functions
+    - include: color-adjuster-operators
+    - include: color-values
+    - include: none-constants
+    - include: numeric-constants
+    - include: sublime-color-variables
+    - match: \b(?i:rgb|hsl|hwb){{break}}
+      scope: keyword.other.color-space.css
+    - include: other-constants
+
+  var-functions:
+    - match: \b((?i:var))(\()
+      captures:
+        1: meta.function-call.identifier.css support.function.css
+        2: meta.function-call.arguments.css meta.group.css punctuation.section.group.begin.css
+      push: var-function-argument-list-body
+
+  var-function:
+    - match: \b((?i:var))(\()
+      captures:
+        1: meta.function-call.identifier.css support.function.css
+        2: meta.function-call.arguments.css meta.group.css punctuation.section.group.begin.css
+      push: var-function-argument-list-body
+
+  var-function-argument-list-body:
+    # ST's `var()` function does not support default values (e.g. `var(name #fff)`)
+    - meta_scope: meta.function-call.var.sublime-color-scheme
+    - meta_content_scope: meta.function-call.arguments.css meta.group.css
+    - match: \)
+      scope: meta.function-call.arguments.css meta.group.css punctuation.section.group.end.css
+      pop: 1
+    - include: sublime-color-variables
+    - include: sublime-other-variables
+
+###[ IDENTIFIERS ]#############################################################
+
+  none-constants:
+    # Note: required until sublimehq/Packages/pulls/3717 (<ST4149)
+    - match: (?i:none){{break}}
+      scope: constant.language.null.css
+
+  sublime-color-variables:
+    - match: |-
+        (?x)
+        --(?:
+            background
+          | foreground
+          | accent
+          | bluish
+          | cyanish
+          | greenish
+          | orangish
+          | pinkish
+          | purplish
+          | redish
+          | yellowish
+        ){{break}}
+      scope: variable.language.sublime-color-scheme
+
+  sublime-other-variables:
+    # Supports identifiers with and without leading `--`
+    - match: '{{ident}}'
+      scope: variable.other.sublime-color-scheme
+
+###[ PUNCTUATION ]#############################################################
+
+  illegal-commas:
+    # Note: required until sublimehq/Packages/pulls/3831 (<ST4174)
+    - match: ','
+      scope: invalid.illegal.unexpected-token.css
+
+###############################################################################
+
+variables:
+  # Block punctuation
+  # Note: required until sublimehq/Packages/pulls/4055 (<ST4193)
+  block_end: \}

Package/Sublime JSON/Sublime JSON.sublime-syntax

@@ -205,10 +205,19 @@ contexts:
     - match: '"'
       scope: punctuation.definition.string.end.json
       pop: true
-    - include: string-escape
     - match: $\n?
       scope: invalid.illegal.unclosed-string.json
       pop: true
+    - include: string-escape
+
+  inside-interpolated-string:
+    - match: '"'
+      scope: string.quoted.double.json punctuation.definition.string.end.json
+      pop: true
+    - match: $\n?
+      scope: string.quoted.double.json invalid.illegal.unclosed-string.json
+      pop: true
+    - include: string-escape
 
   string-escape:
     - match: |-

Package/Sublime Text Color Scheme/Completions/Globals Keys.sublime-completions

@@ -1,5 +1,5 @@
 {
-    "scope": "meta.globals.sublime-color-scheme - string - comment",
+    "scope": "meta.globals.sublime-color-scheme - meta.mapping.key - meta.string - string - comment",
     "completions": [
         {
             "trigger": "accent",

Package/Sublime Text Color Scheme/Completions/Main Keys.sublime-completions

@@ -1,5 +1,5 @@
 {
-    "scope": "meta.color-scheme.collection.sublime-color-scheme - meta.mapping meta.mapping - meta.sequence - string - comment",
+    "scope": "meta.color-scheme.collection.sublime-color-scheme - meta.mapping meta.mapping - meta.sequence - meta.string - string - comment",
     "completions": [
         {
             "trigger": "variables",

Package/Sublime Text Color Scheme/Completions/Rule Keys.sublime-completions

@@ -1,5 +1,5 @@
 {
-    "scope": "meta.rule.sublime-color-scheme - meta.sequence meta.sequence - string - comment",
+    "scope": "meta.rule.sublime-color-scheme - meta.sequence meta.sequence - meta.string - string - comment",
     "completions": [
         {
             "trigger": "scope",