fix(style): header-dividing animation

src/styles/header-dividing.scss

@@ -53,7 +53,7 @@
   &::after {
     content: '';
     position: absolute;
-    left: -10%;
+    left: -5%;
     top: 50%;
     transform: translateY(-50%);
     width: 30%;
@@ -84,7 +84,7 @@
     background-color: color-mix(in srgb, var(--background) 90%, transparent);
     box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
 
-    /* 进入动画：透明度由0到1 */
+    // 进入动画：透明度由0到1
     animation: sticky-in 0.5s ease-in-out forwards;
     opacity: 1;
 
@@ -116,10 +116,12 @@
 // 扫描线动画 - 模拟终端扫描效果
 @keyframes scan-line {
   0% {
-    left: -10%;
+    left: -5%;
+    width: 5%;
     opacity: 0;
   }
   30% {
+    width: 30%;
     opacity: .3;
   }
   70% {