style(欢迎页): 调整欢迎页组件样式和布局

- 将轨道布局改为水平布局，使用 flex 实现
- 缩小入口图标尺寸和标题字体大小
- 简化动画实现，移除基于优先级的定位类
- 调整内边距，优化整体间距

+<!--
+ * @Date: 2026-01-28 17:24:46
+ * @LastEditors: hookehuyr hookehuyr@gmail.com
+ * @LastEditTime: 2026-01-28 17:25:09
+ * @FilePath: /mlaj/src/components/welcome/WelcomeContent.vue
+ * @Description: 欢迎页内容组件
+-->
 <template>
   <div class="welcome-content">
-    <!-- 功能入口区域 - 轨道布局 -->
+    <!-- 功能入口区域 - 水平布局 -->
     <div class="entry-orbit">
-      <!-- 3个功能入口 - 轨道布局 -->
       <div class="orbit-entries">
         <WelcomeEntryItem
           v-for="entry in entries"
           :key="entry.id"
           :entry="entry"
           class="orbit-entry"
-          :class="`orbit-entry-${entry.priority}`"
           @click="handleEntryClick"
         />
       </div>
@@ -49,47 +54,39 @@ const handleEntryClick = (entry) => {
   flex-direction: column;
   align-items: center;
   justify-content: flex-end;
-  padding: 2rem;
-  padding-bottom: 8rem;
+  padding-left: 2rem;
+  padding-right: 2rem;
+  padding-bottom: 3rem;
   z-index: 1;
 }
 
 .entry-orbit {
   position: relative;
   width: 100%;
-  max-width: 20rem;
-  aspect-ratio: 1;
+  max-width: 36rem;
 
   .orbit-entries {
-    position: relative;
-    width: 100%;
-    height: 100%;
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+    align-items: center;
+    gap: 0;
 
     .orbit-entry {
-      position: absolute;
-      top: 50%;
-      left: 50%;
-      transform: translate(-50%, -50%);
+      flex: 1;
+      display: flex;
+      justify-content: center;
       animation: float 3s ease-in-out infinite;
 
-      &.orbit-entry-1 {
-        // 课程中心 - 顶部偏左
-        top: 5%;
-        left: 40%;
+      &:nth-child(1) {
         animation-delay: 0s;
       }
 
-      &.orbit-entry-2 {
-        // 活动中心 - 右下
-        top: 75%;
-        left: 80%;
+      &:nth-child(2) {
         animation-delay: 0.5s;
       }
 
-      &.orbit-entry-3 {
-        // 个人中心 - 左下
-        top: 70%;
-        left: 20%;
+      &:nth-child(3) {
         animation-delay: 1s;
       }
     }
@@ -99,10 +96,10 @@ const handleEntryClick = (entry) => {
 // 动画定义
 @keyframes float {
   0%, 100% {
-    transform: translate(-50%, -50%) translateY(0);
+    transform: translateY(0);
   }
   50% {
-    transform: translate(-50%, -50%) translateY(-10px);
+    transform: translateY(-10px);
   }
 }
 </style>

@@ -61,22 +61,22 @@ const handleClick = () => {
 
   .entry-icon-wrapper {
     position: relative;
-    width: 6rem;
-    height: 6rem;
+    width: 5rem;
+    height: 5rem;
     border-radius: 50%;
     display: flex;
     align-items: center;
     justify-content: center;
 
     .entry-icon {
-      width: 6rem;
-      height: 6rem;
+      width: 5rem;
+      height: 5rem;
       object-fit: contain;
     }
   }
 
   .entry-title {
-    font-size: 1rem;
+    font-size: 0.95rem;
     font-weight: 500;
     color: #ffffff;
     text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);