diff --git a/components/Footer.tsx b/components/Footer.tsx
index f244e99..1e82cf2 100644
--- a/components/Footer.tsx
+++ b/components/Footer.tsx
@@ -15,7 +15,7 @@ const Footer: React.FC = () => {
       <div className="container mx-auto px-8 flex justify-between items-center">
         <div className="flex items-center gap-3 text-[10px] font-bold tracking-tight">
           <span className="text-slate-500 dark:text-slate-400">
-            © 2025 EricHuang
+            © 2025 <span style={{ color: 'var(--brand-primary)' }}>EricHuang</span>
           </span>
           <div className="w-px h-2 bg-slate-300 dark:bg-slate-700" />
           <span className="text-slate-400 dark:text-slate-500 uppercase tracking-widest">
@@ -27,7 +27,7 @@ const Footer: React.FC = () => {
           href={GITHUB_URL}
           target="_blank"
           rel="noopener noreferrer"
-          className="flex items-center gap-1.5 text-slate-500 dark:text-slate-400 hover:text-indigo-600 dark:hover:text-indigo-400 transition-colors text-[10px] font-bold"
+          className="flex items-center gap-1.5 text-slate-500 dark:text-slate-400 hover-brand transition-colors text-[10px] font-bold"
         >
           <Github className="w-3 h-3" />
           <span>GitHub</span>
diff --git a/components/MarkdownEditor.tsx b/components/MarkdownEditor.tsx
index b49e09c..7500b73 100644
--- a/components/MarkdownEditor.tsx
+++ b/components/MarkdownEditor.tsx
@@ -87,14 +87,13 @@ const MarkdownEditor: React.FC = () => {
             />
           </div>
 
-          {/* Resizable Divider */}
-          <div 
-            onMouseDown={startResizing}
-            className="w-1.5 h-full cursor-col-resize hover:bg-indigo-500/30 active:bg-indigo-500/50 transition-colors z-10 flex items-center justify-center group"
-          >
-            <div className="w-0.5 h-8 bg-slate-300 dark:bg-slate-700 group-hover:bg-indigo-500 rounded-full transition-colors" />
-          </div>
-
+                    {/* Resizable Divider */}
+                    <div 
+                      onMouseDown={startResizing}
+                      className="w-1.5 h-full cursor-col-resize resizer-product transition-colors z-10 flex items-center justify-center group"
+                    >
+                      <div className="w-0.5 h-8 bg-slate-300 dark:bg-slate-700 group-hover:bg-product rounded-full transition-colors" />
+                    </div>
           <div style={{ width: `${100 - splitPercent}%` }} className="flex flex-col h-full">
             <PreviewPane 
               parsedBlocks={parsedBlocks}
diff --git a/components/editor/EditorHeader.tsx b/components/editor/EditorHeader.tsx
index 6932841..8cab525 100644
--- a/components/editor/EditorHeader.tsx
+++ b/components/editor/EditorHeader.tsx
@@ -37,11 +37,17 @@ export const EditorHeader: React.FC = () => {
   return (
     <header className="bg-white dark:bg-slate-900 border-b border-slate-200 dark:border-slate-800 px-8 py-4 flex justify-between items-center z-20 shadow-sm transition-colors">
       <div className="flex items-center gap-4">
-        <div className="bg-slate-900 dark:bg-indigo-600 p-1 rounded-xl">
+        <div 
+          className="p-1 rounded-xl"
+          style={{ backgroundColor: 'var(--product-primary)' }}
+        >
           <img src={logoPath} alt="Logo" className="w-9 h-9" />
         </div>
         <div>
-          <h1 className="text-xl font-black text-slate-900 dark:text-white tracking-tight">
+          <h1 
+            className="text-xl font-black tracking-tight"
+            style={{ color: 'var(--product-primary)' }}
+          >
             {t('title')}
           </h1>
           <p className="text-[10px] text-slate-400 dark:text-slate-500 font-bold uppercase tracking-widest">{t('subtitle')}</p>
@@ -55,7 +61,8 @@ export const EditorHeader: React.FC = () => {
           <IconButton
             onClick={() => setIsAIModalOpen(true)}
             title={t('aiPrompt')}
-            className="bg-transparent border-none hover:bg-white dark:hover:bg-slate-700 shadow-none text-indigo-600 dark:text-indigo-400"
+            className="bg-transparent border-none hover:bg-white dark:hover:bg-slate-700 shadow-none"
+            style={{ color: 'var(--product-primary)' }}
           >
             <Bot className="w-4 h-4" />
           </IconButton>
diff --git a/components/editor/EditorPane.tsx b/components/editor/EditorPane.tsx
index 00e3c5c..c892c1d 100644
--- a/components/editor/EditorPane.tsx
+++ b/components/editor/EditorPane.tsx
@@ -135,7 +135,8 @@ export const EditorPane: React.FC<EditorPaneProps> = ({
       <textarea
         ref={textareaRef}
         onScroll={onScroll}
-        className="flex-1 w-full p-10 resize-none focus:outline-none text-base leading-[1.8] text-slate-700 dark:text-slate-300 bg-transparent selection:bg-indigo-100 dark:selection:bg-indigo-900"
+                  className="flex-1 w-full p-10 resize-none focus:outline-none text-base leading-[1.8] text-slate-700 dark:text-slate-300 bg-transparent selection-product"
+        
         style={{ fontFamily: UI_THEME.FONTS.PREVIEW }}
         value={content}
         onChange={handleChange}
diff --git a/components/editor/PreviewRenderers.tsx b/components/editor/PreviewRenderers.tsx
index e5c69d3..6995474 100644
--- a/components/editor/PreviewRenderers.tsx
+++ b/components/editor/PreviewRenderers.tsx
@@ -102,9 +102,9 @@ export const PreviewBlock: React.FC<{ block: ParsedBlock; showLineNumbers?: bool
     case BlockType.HEADING_1:
       return <h1 className="text-4xl font-black mb-12 mt-16 pb-4 border-b-4 border-slate-900 tracking-tight leading-tight"><RenderRichText text={block.content} /></h1>;
     case BlockType.HEADING_2:
-      return <h2 className="text-2xl font-black mb-8 mt-12 tracking-tight flex items-center gap-3 before:w-2 before:h-8 before:bg-indigo-600"><RenderRichText text={block.content} /></h2>;
+      return <h2 className="text-2xl font-black mb-8 mt-12 tracking-tight flex items-center gap-3 before:w-2 before:h-8 before-bg-product"><RenderRichText text={block.content} /></h2>;
     case BlockType.HEADING_3:
-      return <h3 className="text-xl font-bold mb-6 mt-10 text-slate-800 underline decoration-indigo-200 underline-offset-8 decoration-4"><RenderRichText text={block.content} /></h3>;
+      return <h3 className="text-xl font-bold mb-6 mt-10 text-slate-800 dark:text-slate-200 underline decoration-product underline-offset-8 decoration-4"><RenderRichText text={block.content} /></h3>;
     case BlockType.CODE_BLOCK:
       const codeLines = block.content.split('\n');
       return (
@@ -138,14 +138,17 @@ export const PreviewBlock: React.FC<{ block: ParsedBlock; showLineNumbers?: bool
           <div className={`
             ${isCenter ? 'max-w-[90%]' : 'max-w-[85%]'} 
             border-2 p-6 relative 
-            ${isRight ? 'border-dashed border-slate-900 bg-white text-right' : 
-              isCenter ? 'border-double border-indigo-400 bg-indigo-50/30 text-center' : 
-              'border-dotted border-slate-900 bg-slate-100 text-left'}
+            ${isRight ? 'border-dashed border-slate-900 dark:border-slate-400 bg-white dark:bg-slate-900 text-right' : 
+              isCenter ? 'border-double border-product bg-product-glow text-center' : 
+              'border-dotted border-slate-900 dark:border-slate-400 bg-slate-100 dark:bg-slate-800 text-left'}
           `}>
-            <div class={`absolute -top-3 ${isRight ? 'left-4' : isCenter ? 'left-1/2 -translate-x-1/2' : 'right-4'} bg-inherit px-2 text-[10px] font-black tracking-widest text-indigo-600 border border-slate-200 uppercase`}>
+            <div 
+              class={`absolute -top-3 ${isRight ? 'left-4' : isCenter ? 'left-1/2 -translate-x-1/2' : 'right-4'} bg-inherit px-2 text-[10px] font-black tracking-widest border border-slate-200 dark:border-slate-700 uppercase`}
+              style={{ color: 'var(--product-primary)' }}
+            >
               {block.role}
             </div>
-            <div className="whitespace-pre-wrap leading-[1.8] text-slate-900"><RenderRichText text={block.content} /></div>
+            <div className="whitespace-pre-wrap leading-[1.8] text-slate-900 dark:text-slate-100"><RenderRichText text={block.content} /></div>
           </div>
         </div>
       );
diff --git a/components/editor/slash-command/SlashCommandMenu.tsx b/components/editor/slash-command/SlashCommandMenu.tsx
index 339249d..fc4d881 100644
--- a/components/editor/slash-command/SlashCommandMenu.tsx
+++ b/components/editor/slash-command/SlashCommandMenu.tsx
@@ -106,25 +106,33 @@ export const SlashCommandMenu: React.FC<SlashCommandMenuProps> = ({
             const Icon = item.icon;
             
             return (
-              <button
-                key={item.id}
-                ref={isSelected ? selectedItemRef : null}
-                className={`w-full flex items-center gap-3 px-3 py-2 text-left text-sm rounded-md transition-colors
-                  ${isSelected 
-                    ? 'bg-indigo-50 dark:bg-indigo-900/30 text-indigo-700 dark:text-indigo-300' 
-                    : 'text-slate-700 dark:text-slate-300 hover:bg-slate-100 dark:hover:bg-slate-700/50'
-                  }
+            <button
+              key={command.id}
+              onClick={() => {
+                onSelect(command.id);
+              }}
+              className={`
+                w-full flex items-center gap-3 px-3 py-2 text-sm text-left transition-all
+                ${idx === selectedIndex 
+                  ? 'bg-product-glow' 
+                  : 'hover:bg-slate-50 dark:hover:bg-slate-800 text-slate-700 dark:text-slate-300'}
+              `}
+              style={idx === selectedIndex ? { color: 'var(--product-primary)' } : {}}
+            >
+              <div 
+                className={`
+                  p-1.5 rounded-lg border transition-colors
+                  ${idx === selectedIndex 
+                    ? 'bg-white dark:bg-slate-900' 
+                    : 'bg-slate-100 dark:bg-slate-800 border-slate-200 dark:border-slate-700'}
                 `}
-                onClick={() => onSelect(item)}
+                style={idx === selectedIndex ? { borderColor: 'var(--product-primary)' } : {}}
               >
-                <div className={`flex items-center justify-center w-8 h-8 rounded border 
-                  ${isSelected 
-                    ? 'bg-white dark:bg-indigo-900/50 border-indigo-200 dark:border-indigo-800 text-indigo-600 dark:text-indigo-400' 
-                    : 'bg-slate-50 dark:bg-slate-800 border-slate-200 dark:border-slate-700 text-slate-500 dark:text-slate-400'
-                  }`}
-                >
-                  <Icon size={16} />
-                </div>
+                {React.cloneElement(command.icon as React.ReactElement, { 
+                  className: "w-4 h-4",
+                  style: idx === selectedIndex ? { color: 'var(--product-primary)' } : {}
+                })}
+              </div>
                 <div className="flex flex-col flex-1 min-w-0">
                   <span className="font-medium truncate">{item.label}</span>
                   {item.description && (
diff --git a/components/ui/Button.tsx b/components/ui/Button.tsx
index 5d76e84..2a2ff4f 100644
--- a/components/ui/Button.tsx
+++ b/components/ui/Button.tsx
@@ -11,19 +11,29 @@ export const Button: React.FC<ButtonProps> = ({
   variant = 'primary', 
   isLoading,
   disabled,
+  style,
   ...props 
 }) => {
   const baseStyles = "flex items-center justify-center gap-2 px-6 py-2.5 font-bold rounded-xl transition-all shadow-md active:scale-95 disabled:active:scale-100 disabled:cursor-not-allowed";
   
   const variants = {
-    primary: "bg-slate-900 dark:bg-indigo-600 hover:bg-slate-800 dark:hover:bg-indigo-500 text-white disabled:bg-slate-300 dark:disabled:bg-slate-700",
+    primary: "text-white disabled:bg-slate-300 dark:disabled:bg-slate-700",
     secondary: "bg-slate-100 dark:bg-slate-800 text-slate-600 dark:text-slate-300 hover:bg-slate-200 dark:hover:bg-slate-700",
     danger: "bg-red-500 text-white hover:bg-red-600"
   };
 
+  const primaryStyles = variant === 'primary' ? {
+    backgroundColor: 'var(--product-primary)',
+    boxShadow: '0 4px 12px var(--product-glow)',
+  } : {};
+
+  // Handle hover for primary via CSS or just keep it simple if we can't easily do hover in inline styles without a library
+  // Better yet, I can add a small CSS block in index.html for .btn-primary-product
+
   return (
     <button 
-      className={`${baseStyles} ${variants[variant]} ${className}`}
+      className={`${baseStyles} ${variants[variant]} ${variant === 'primary' ? 'btn-product-primary' : ''} ${className}`}
+      style={{ ...primaryStyles, ...style }}
       disabled={disabled || isLoading}
       {...props}
     >
diff --git a/components/ui/IconButton.tsx b/components/ui/IconButton.tsx
index 1eb6d1c..95a7525 100644
--- a/components/ui/IconButton.tsx
+++ b/components/ui/IconButton.tsx
@@ -8,15 +8,22 @@ export const IconButton: React.FC<IconButtonProps> = ({
   children, 
   className = '', 
   active,
+  style,
   ...props 
 }) => {
   const baseStyles = "p-2 rounded-lg border transition-all flex items-center justify-center";
   const defaultStyles = "bg-slate-100 dark:bg-slate-800 text-slate-600 dark:text-slate-300 border-slate-200 dark:border-slate-700 hover:bg-slate-200 dark:hover:bg-slate-700";
-  const activeStyles = "bg-indigo-100 dark:bg-indigo-900/50 text-indigo-600 dark:text-indigo-400 border-indigo-200 dark:border-indigo-800";
+  
+  const activeStyles = {
+    backgroundColor: 'var(--product-glow)',
+    color: 'var(--product-primary)',
+    borderColor: 'var(--product-primary)',
+  };
 
   return (
     <button 
-      className={`${baseStyles} ${active ? activeStyles : defaultStyles} ${className}`}
+      className={`${baseStyles} ${active ? '' : defaultStyles} ${className}`}
+      style={active ? { ...activeStyles, ...style } : style}
       {...props}
     >
       {children}
diff --git a/globals.css b/globals.css
new file mode 100644
index 0000000..245d7ce
--- /dev/null
+++ b/globals.css
@@ -0,0 +1,93 @@
+/* --- 設計系統核心變數 (Amber Anthracite v2.0 + Scholarly Blue) --- */
+:root {
+  --font-main: "Consolas", "Microsoft JhengHei", "微軟正黑體", sans-serif;
+
+  /* Master Brand: Amber Anthracite v2.0 */
+  --bg-base: #FCF9F5;
+  --text-high: #2D2926;
+  --brand-primary: #A86434; /* Amber */
+
+  /* MD2DOC Product Layer: Scholarly Blue */
+  --product-primary: #3E5C76; 
+  --product-hover: #527491;
+  --product-glow: rgba(62, 92, 118, 0.12);
+}
+
+[data-theme='dark'] {
+  --bg-base: #1A1816;
+  --text-high: #E0E0E0;
+  --brand-primary: #EFC69B; /* Soft Amber */
+
+  --product-primary: #6D9DC5;
+  --product-hover: #8AB3D6;
+  --product-glow: rgba(109, 157, 197, 0.2);
+}
+
+/* --- 基礎頁面樣式 --- */
+body {
+  font-family: var(--font-main);
+  background-color: var(--bg-base);
+  color: var(--text-high);
+  margin: 0;
+  transition: background-color 0.3s ease, color 0.3s ease;
+}
+
+.manuscript-font {
+  font-family: var(--font-main);
+}
+
+code, pre, .font-mono {
+  font-family: "Consolas", monospace !important;
+}
+
+/* --- 自定義捲軸樣式 --- */
+::-webkit-scrollbar { width: 8px; height: 8px; }
+::-webkit-scrollbar-track { background: var(--bg-base); }
+::-webkit-scrollbar-thumb { 
+  background: #cbd5e1; 
+  border-radius: 4px; 
+}
+[data-theme='dark'] ::-webkit-scrollbar-thumb {
+  background: #334155;
+}
+::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
+
+/* --- 產品功能性 Helper Classes --- */
+
+/* 按鈕主色調 */
+.btn-product-primary {
+  background-color: var(--product-primary);
+  transition: all 0.2s ease;
+}
+
+.btn-product-primary:hover:not(:disabled) {
+  background-color: var(--product-hover);
+  transform: translateY(-1px);
+  box-shadow: 0 6px 16px var(--product-glow);
+}
+
+/* 文字選取顏色 */
+.selection-product::selection {
+  background-color: var(--product-glow);
+}
+
+/* 預覽區 H2 裝飾線 */
+.before-bg-product::before {
+  content: "";
+  display: block;
+  background-color: var(--product-primary) !important;
+}
+
+/* 分隔線調整工具 */
+.resizer-product:hover {
+  background-color: var(--product-glow);
+}
+
+.resizer-product:active {
+  background-color: rgba(109, 157, 197, 0.4);
+}
+
+/* 品牌簽名 Hover */
+.hover-brand:hover {
+  color: var(--brand-primary) !important;
+}
diff --git a/index.html b/index.html
index de96f29..a54f202 100644
--- a/index.html
+++ b/index.html
@@ -64,37 +64,21 @@
     <script src="https://cdn.tailwindcss.com"></script>
     <script>
         tailwind.config = {
-            darkMode: 'class'
+            darkMode: 'class',
+            theme: {
+                extend: {
+                    colors: {
+                        'brand-primary': 'var(--brand-primary)',
+                        'product-primary': 'var(--product-primary)',
+                        'product-hover': 'var(--product-hover)',
+                        'product-glow': 'var(--product-glow)',
+                        'bg-base': 'var(--bg-base)',
+                        'text-high': 'var(--text-high)',
+                    }
+                }
+            }
         }
     </script>
-    <style>
-        /* 核心排版策略：英數強制 Consolas，中文微軟正黑體 */
-        :root {
-            --font-main: "Consolas", "Microsoft JhengHei", "微軟正黑體", sans-serif;
-        }
-
-        body {
-            font-family: var(--font-main);
-            background-color: #f1f5f9;
-            margin: 0;
-            color: #1e293b;
-        }
-
-        .manuscript-font {
-            font-family: var(--font-main);
-        }
-
-        /* 程式碼塊強制等寬 */
-        code, pre, .font-mono {
-            font-family: "Consolas", monospace !important;
-        }
-
-        /* 自定義捲軸 */
-        ::-webkit-scrollbar { width: 8px; height: 8px; }
-        ::-webkit-scrollbar-track { background: #f8fafc; }
-        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
-        ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
-    </style>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/buffer/6.0.3/buffer.min.js"></script>
     <script>
         // 關鍵：將 Buffer 掛載到全局，docx 庫才能運作
diff --git a/index.tsx b/index.tsx
index d57c69f..84ec456 100644
--- a/index.tsx
+++ b/index.tsx
@@ -8,6 +8,7 @@
 import React from 'react';
 import { createRoot } from 'react-dom/client';
 import App from './App';
+import './globals.css';
 import './services/i18n'; // Initialize i18n
 
 const container = document.getElementById('root');