refactor: 优化主标题书法风格

- 使用柔和的 text-shadow 模拟书法笔触效果
- 调整字重和字间距
- 保持简洁不做过度设计

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/pages/LandingPage.tsx

@@ -304,16 +304,22 @@ export function LandingPage() {
             />
           </div>
 
-          {/* 主标题 - 优化字体 */}
+          {/* 主标题 - 书法风格 */}
           <Title
             order={1}
             style={{
-              fontWeight: 300,
-              fontSize: 'clamp(2.2rem, 7vw, 3.2rem)',
-              letterSpacing: '0.25em',
-              color: '#1a1a1a',
-              fontFamily: 'Noto Serif SC, Georgia, serif',
-              lineHeight: 1.3,
+              fontWeight: 500,
+              fontSize: 'clamp(2.2rem, 7vw, 3.5rem)',
+              letterSpacing: '0.35em',
+              color: '#2a2a2a',
+              fontFamily: 'Georgia, "Times New Roman", serif',
+              lineHeight: 1.5,
+              // 柔和书法阴影
+              textShadow: `
+                0 1px 0 rgba(255,255,255,0.8),
+                0 2px 1px rgba(0,0,0,0.05),
+                0 3px 2px rgba(0,0,0,0.03)
+              `,
             }}
           >
             掐日子