优化首页Hero区域：全屏高度、居中布局、增大字体

css/style.css

@@ -143,6 +143,10 @@ body {
 .hero {
     position: relative;
     overflow: hidden;
+    min-height: 100vh;  /* 全屏高度 */
+    display: flex;
+    align-items: center;
+    justify-content: center;
 }
 
 .hero-background {
@@ -162,6 +166,34 @@ body {
 .hero-content {
     position: relative;
     z-index: 1;
+    text-align: center;
+    padding: 2rem;
+    max-width: 900px;
+}
+
+.hero-title {
+    font-size: 4.5rem;
+    font-weight: 700;
+    color: var(--text-primary);
+    margin-bottom: 1.5rem;
+    letter-spacing: 3px;
+    line-height: 1.2;
+}
+
+.hero-subtitle {
+    font-size: 1.8rem;
+    color: var(--primary-color);
+    margin-bottom: 1.5rem;
+    letter-spacing: 2px;
+    font-weight: 500;
+}
+
+.hero-description {
+    font-size: 1.2rem;
+    color: var(--text-secondary);
+    margin-bottom: 2.5rem;
+    letter-spacing: 1px;
+    line-height: 1.6;
 }
 
 /* ========================================