diff --git a/.agents/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.agents/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.agents/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.agents/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.agents/skills/impeccable/scripts/detector/rules/checks.mjs b/.agents/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.agents/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.agents/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.claude/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.claude/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.claude/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.claude/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.claude/skills/impeccable/scripts/detector/rules/checks.mjs b/.claude/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.claude/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.claude/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.cursor/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.cursor/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.cursor/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.cursor/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.cursor/skills/impeccable/scripts/detector/rules/checks.mjs b/.cursor/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.cursor/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.cursor/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.gemini/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.gemini/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.gemini/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.gemini/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.gemini/skills/impeccable/scripts/detector/rules/checks.mjs b/.gemini/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.gemini/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.gemini/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.github/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.github/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.github/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.github/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.github/skills/impeccable/scripts/detector/rules/checks.mjs b/.github/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.github/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.github/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.grok/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.grok/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.grok/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.grok/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.grok/skills/impeccable/scripts/detector/rules/checks.mjs b/.grok/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.grok/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.grok/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.kiro/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.kiro/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.kiro/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.kiro/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.kiro/skills/impeccable/scripts/detector/rules/checks.mjs b/.kiro/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.kiro/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.kiro/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.opencode/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.opencode/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.opencode/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.opencode/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.opencode/skills/impeccable/scripts/detector/rules/checks.mjs b/.opencode/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.opencode/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.opencode/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.pi/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.pi/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.pi/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.pi/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.pi/skills/impeccable/scripts/detector/rules/checks.mjs b/.pi/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.pi/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.pi/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.qoder/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.qoder/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.qoder/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.qoder/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.qoder/skills/impeccable/scripts/detector/rules/checks.mjs b/.qoder/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.qoder/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.qoder/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.rovodev/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.rovodev/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.rovodev/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.rovodev/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.rovodev/skills/impeccable/scripts/detector/rules/checks.mjs b/.rovodev/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.rovodev/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.rovodev/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.trae-cn/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.trae-cn/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.trae-cn/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.trae-cn/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.trae-cn/skills/impeccable/scripts/detector/rules/checks.mjs b/.trae-cn/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.trae-cn/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.trae-cn/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.trae/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.trae/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.trae/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.trae/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.trae/skills/impeccable/scripts/detector/rules/checks.mjs b/.trae/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.trae/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.trae/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/.vibe/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/.vibe/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/.vibe/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/.vibe/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/.vibe/skills/impeccable/scripts/detector/rules/checks.mjs b/.vibe/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/.vibe/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/.vibe/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,
diff --git a/plugin/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs b/plugin/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
index c0f96f60f..53d7be48c 100644
--- a/plugin/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
+++ b/plugin/skills/impeccable/scripts/detector/engines/static-html/css-cascade.mjs
@@ -2,7 +2,7 @@ import fs from 'node:fs';
 import path from 'node:path';
 
 import { profileStep, recordProfileEvent } from '../../profile/profiler.mjs';
-import { collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
+import { CSS_NAMED_COLORS, collectCssCustomProps, cssLengthToPx, parseAnyColor, resolveLengthPx, resolveVarRefs } from '../../rules/checks.mjs';
 
 // ---------------------------------------------------------------------------
 // jsdom CSS-variable border override map
@@ -344,18 +344,29 @@ const STATIC_PROP_MAP = {
   'overflow-y': 'overflowY',
 };
 
+// parseStaticColor tries parseAnyColor first, which already resolves every
+// name in the shared CSS_NAMED_COLORS table. This fallback only carries the
+// keywords parseAnyColor deliberately returns null for: the cascade needs
+// `transparent` to read as an actual zero-alpha color.
 const STATIC_NAMED_COLORS = {
-  black: { r: 0, g: 0, b: 0, a: 1 },
-  white: { r: 255, g: 255, b: 255, a: 1 },
   transparent: { r: 0, g: 0, b: 0, a: 0 },
-  gray: { r: 128, g: 128, b: 128, a: 1 },
-  grey: { r: 128, g: 128, b: 128, a: 1 },
-  silver: { r: 192, g: 192, b: 192, a: 1 },
-  red: { r: 255, g: 0, b: 0, a: 1 },
-  green: { r: 0, g: 128, b: 0, a: 1 },
-  blue: { r: 0, g: 0, b: 255, a: 1 },
 };
 
+// Named-color alternation for plucking a color token out of shorthand values
+// (issue #359: a hardcoded 9-name list here silently dropped `purple`,
+// `crimson`, `teal`, ... from border shorthands, so the side defaulted to
+// neutral black and side-tab never fired on .html files). Derived from the
+// same table parseAnyColor resolves against, so extraction and parsing can't
+// drift apart. Longest-first so names containing other names as substrings
+// (rebeccapurple) are matched whole.
+const NAMED_COLOR_TOKENS = [...Object.keys(CSS_NAMED_COLORS), ...Object.keys(STATIC_NAMED_COLORS)]
+  .sort((a, b) => b.length - a.length)
+  .join('|');
+const STATIC_COLOR_TOKEN_RE = new RegExp(
+  `(?:rgba?\\([^)]+\\)|oklch\\([^)]+\\)|oklab\\([^)]+\\)|lch\\([^)]+\\)|lab\\([^)]+\\)|hsla?\\([^)]+\\)|hwb\\([^)]+\\)|#[0-9a-f]{3,8}\\b|\\b(?:${NAMED_COLOR_TOKENS})\\b)`,
+  'i'
+);
+
 function splitCssList(value) {
   const parts = [];
   let depth = 0, quote = '', start = 0;
@@ -441,7 +452,7 @@ function extractStaticColor(value) {
     }
     return '';
   }
-  const colorLike = raw.match(/(?:rgba?\([^)]+\)|oklch\([^)]+\)|oklab\([^)]+\)|lch\([^)]+\)|lab\([^)]+\)|hsla?\([^)]+\)|hwb\([^)]+\)|#[0-9a-f]{3,8}\b|\b(?:black|white|gray|grey|silver|red|green|blue|transparent)\b)/i);
+  const colorLike = raw.match(STATIC_COLOR_TOKEN_RE);
   if (!colorLike) return '';
   return colorLike[0];
 }
diff --git a/plugin/skills/impeccable/scripts/detector/rules/checks.mjs b/plugin/skills/impeccable/scripts/detector/rules/checks.mjs
index 418aa8f45..141a209a2 100644
--- a/plugin/skills/impeccable/scripts/detector/rules/checks.mjs
+++ b/plugin/skills/impeccable/scripts/detector/rules/checks.mjs
@@ -5369,6 +5369,7 @@ function checkFirstViewportColumnOverflowDOM() {
 }
 
 export {
+  CSS_NAMED_COLORS,
   checkBorders,
   isEmojiOnlyText,
   checkColors,