feat(css): 实现现代化毛玻璃效果和动态主题系统

- 引入CSS变量系统，定义完整的色彩和样式变量
- 应用radial-gradient和linear-gradient创建动态背景效果
- 实现backdrop-filter毛玻璃效果，增强视觉层次感
- 添加悬停交互反馈和过渡动画
- 统一文字颜色和背景透明度处理
- 优化移动端显示效果和响应式设计
- 增强阴影效果和边框样式一致性
- 添加orbit轨道动画和相位控制
- 改进渐变色应用和文本填充效果
- 优化技术栈标签云的视觉表现

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+    "excerpt": "深入探讨向量数据库的核心算法、应用场景和选型策略，帮助开发者掌握高维数据存储的关键技术...",
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+    "title": "CompletableFuture 从源码到实战：让异步编程像喝奶茶一样丝滑",
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+    "pubDate": "2024-12-30",
+    "category": "Spring框架"
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+  {
+    "title": "微服务架构设计模式与最佳实践",
+    "excerpt": "深入分析微服务架构的设计模式，包括服务拆分、数据一致性、分布式事务等核心问题...",
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+    "title": "Redis 高可用集群搭建与性能优化实战",
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