fix(layout): 全局布局铺满优化，顶部导航固定置顶

- 移除 #app 和 body 的居中限制，页面铺满全屏
- SplashView 移除各区域 max-width 限制，内容铺满两侧
- PortalLayout 顶部导航固定在页面顶部，不随滚动移动
- 移除 top-bar 中未登录时重复的登录/注册链接
- HomeView 双栏面板高度撑满视口，去除上下间距

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

offer_frontend/src/layouts/PortalLayout.vue

@@ -1,27 +1,24 @@
 <template>
   <div class="portal-wrap">
-    <!-- 顶部公告条 -->
-    <div class="top-bar">
-      <div class="top-bar-inner">
-        <span class="top-bar-left">欢迎访问集团人才招募平台</span>
-        <div class="top-bar-right">
-          <template v-if="auth.isLoggedIn">
-            <router-link v-if="auth.isSeeker" to="/seeker/applications" class="top-link">我的投递</router-link>
-            <router-link v-else to="/admin/jobs" class="top-link">管理后台</router-link>
-            <span class="top-divider">|</span>
-            <span class="top-link clickable" @click="logout">退出登录</span>
-          </template>
-          <template v-else>
-            <router-link to="/login" class="top-link">登录</router-link>
-            <span class="top-divider">|</span>
-            <router-link to="/register" class="top-link">注册</router-link>
-          </template>
+    <!-- 固定顶部 -->
+    <div class="fixed-top">
+      <!-- 顶部公告条 -->
+      <div class="top-bar">
+        <div class="top-bar-inner">
+          <span class="top-bar-left">欢迎访问集团人才招募平台</span>
+          <div class="top-bar-right">
+            <template v-if="auth.isLoggedIn">
+              <router-link v-if="auth.isSeeker" to="/seeker/applications" class="top-link">我的投递</router-link>
+              <router-link v-else to="/admin/jobs" class="top-link">管理后台</router-link>
+              <span class="top-divider">|</span>
+              <span class="top-link clickable" @click="logout">退出登录</span>
+            </template>
+          </div>
         </div>
       </div>
-    </div>
 
-    <!-- 主导航 -->
-    <header class="main-header">
+      <!-- 主导航 -->
+      <header class="main-header">
       <div class="header-inner">
         <!-- Logo 区域 -->
         <router-link to="/home" class="logo-area">
@@ -67,6 +64,7 @@
         <div class="underline-fill"></div>
       </div>
     </header>
+    </div>
 
     <!-- 内容区 -->
     <main class="portal-main">
@@ -116,6 +114,15 @@ a { text-decoration: none; }
   font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
 }
 
+/* 固定顶部容器 */
+.fixed-top {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  z-index: 100;
+}
+
 /* 顶部公告条 */
 .top-bar {
   background: #1A1A1A;
@@ -146,9 +153,6 @@ a { text-decoration: none; }
 .main-header {
   background: linear-gradient(180deg, #1A1A1A 0%, #0F0F0F 100%);
   box-shadow: 0 4px 20px rgba(0,0,0,0.1);
-  position: sticky;
-  top: 0;
-  z-index: 100;
 }
 .header-inner {
   max-width: 1280px;
@@ -278,13 +282,13 @@ a { text-decoration: none; }
   background: linear-gradient(90deg, #C8973A 0%, #D4AF37 100%);
 }
 
-/* 内容区 */
+/* 内容区 — top-bar(~28px) + header(72px) + underline(3px) = ~103px */
 .portal-main {
   flex: 1;
   max-width: 1280px;
   width: 100%;
   margin: 0 auto;
-  padding: 24px 32px;
+  padding: 100px 32px 0;
 }
 
 /* 页脚 */

offer_frontend/src/style.css

@@ -24,8 +24,6 @@ a:hover {
 
 body {
   margin: 0;
-  display: flex;
-  place-items: center;
   min-width: 320px;
   min-height: 100vh;
 }
@@ -59,10 +57,7 @@ button:focus-visible {
 }
 
 #app {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
+  width: 100%;
 }
 
 @media (prefers-color-scheme: light) {

offer_frontend/src/views/SplashView.vue

@@ -418,8 +418,7 @@ const router = useRouter()
   padding: 48px 0;
 }
 .stats-inner {
-  max-width: 1000px;
-  margin: 0 auto;
+  width: 100%;
   display: flex;
   align-items: center;
   justify-content: space-around;
@@ -447,7 +446,7 @@ const router = useRouter()
   background: #0d0d0d;
   padding: 96px 48px;
 }
-.features-inner { max-width: 1100px; margin: 0 auto; }
+.features-inner { width: 100%; }
 .section-label {
   text-align: center;
   font-size: 13px;
@@ -506,8 +505,7 @@ const router = useRouter()
   padding: 32px 48px;
 }
 .footer-inner {
-  max-width: 1100px;
-  margin: 0 auto;
+  width: 100%;
   display: flex;
   align-items: center;
   justify-content: space-between;

offer_frontend/src/views/portal/HomeView.vue

@@ -174,12 +174,12 @@ onMounted(async () => {
   --muted: #3A3A3A;
 
   display: flex;
-  height: calc(100vh - 220px);
+  height: calc(100vh - 97px);
   min-height: 520px;
   overflow: hidden;
-  border-radius: 6px;
-  border: 1px solid var(--border);
-  box-shadow: 0 4px 24px rgba(0,0,0,0.12);
+  border-radius: 0;
+  border: none;
+  box-shadow: none;
   font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
 }