feat: 更新核心配色系统 - 深色/浅色模式

- 更新深色模式配色变量（科技蓝、紫色、印章红）
- 更新浅色模式配色变量
- 添加新的科技色彩变量（悬停、浅色变体）
- 保持品牌色一致性（印章红 #C41E3A）
- 优化背景色系层次（#0A0A0A → #141414 → #1A1A1A）

src/app/globals.css

@@ -35,7 +35,11 @@
   --color-brand-primary-bg: #FEF2F4;
   
   --color-tech-blue: #00D9FF;
+  --color-tech-blue-hover: #00B8D9;
+  --color-tech-blue-light: #33E1FF;
   --color-tech-purple: #A855F7;
+  --color-tech-purple-hover: #9333EA;
+  --color-tech-purple-light: #C084FC;
   --color-tech-cyan: #06B6D4;
   
   --color-success: #16A34A;
@@ -90,17 +94,17 @@
 
 .dark {
   --color-bg-primary: #0A0A0A;
-  --color-bg-secondary: #171717;
-  --color-bg-tertiary: #262626;
-  --color-bg-hover: #333333;
+  --color-bg-secondary: #141414;
+  --color-bg-tertiary: #1A1A1A;
+  --color-bg-hover: #242424;
   
   --color-text-primary: #FAFAFA;
   --color-text-secondary: #D4D4D4;
   --color-text-tertiary: #A3A3A3;
   --color-text-muted: #737373;
   
-  --color-border-primary: #333333;
-  --color-border-secondary: #262626;
+  --color-border-primary: #262626;
+  --color-border-secondary: #333333;
   --color-border-accent: #404040;
   
   --color-accent: #FAFAFA;
@@ -110,14 +114,18 @@
   --color-link: #D4D4D4;
   --color-link-hover: #FAFAFA;
   
-  --color-brand-primary: #E04A68;
-  --color-brand-primary-hover: #D4244A;
-  --color-brand-primary-light: #E86B85;
+  --color-brand-primary: #C41E3A;
+  --color-brand-primary-hover: #A01830;
+  --color-brand-primary-light: #E04A68;
   --color-brand-primary-lighter: #F08C9F;
   --color-brand-primary-bg: #1A0F11;
   
   --color-tech-blue: #00D9FF;
+  --color-tech-blue-hover: #00B8D9;
+  --color-tech-blue-light: #33E1FF;
   --color-tech-purple: #A855F7;
+  --color-tech-purple-hover: #9333EA;
+  --color-tech-purple-light: #C084FC;
   --color-tech-cyan: #06B6D4;
   
   --color-success: #22C55E;