style: SplashView 去除 hero 红色背景，改为干净浅色

- hero 背景改白→浅灰渐变，去掉红色块
- 文案改深色文字，徽章/按钮改红描边+红底白字
- 装饰竖线/光晕调整为浅底适配

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

offer_frontend/src/views/SplashView.vue

@@ -242,24 +242,13 @@ const router = useRouter()
 .hero-bg {
   position: absolute;
   inset: 0;
-  /* 国聘红渐变背景 */
-  background:
-    linear-gradient(160deg,
-      #EB2C26 0%,
-      #C81E18 35%,
-      #B80006 70%,
-      #8C0008 100%
-    );
+  /* 干净浅色背景 */
+  background: linear-gradient(160deg, #FFFFFF 0%, #F5F5F5 100%);
 }
 .hero-overlay {
   position: absolute;
   inset: 0;
-  background: linear-gradient(
-    to bottom,
-    rgba(0,0,0,0.2) 0%,
-    rgba(0,0,0,0.1) 40%,
-    rgba(0,0,0,0.5) 100%
-  );
+  background: transparent;
 }
 
 /* 建筑风格竖线装饰 */
@@ -276,8 +265,8 @@ const router = useRouter()
   background: linear-gradient(
     to bottom,
     transparent,
-    rgba(255,255,255,0.18) 30%,
-    rgba(255,255,255,0.08) 70%,
+    rgba(0,0,0,0.04) 30%,
+    rgba(0,0,0,0.02) 70%,
     transparent
   );
 }
@@ -300,8 +289,8 @@ const router = useRouter()
   height: 400px;
   background: radial-gradient(
     ellipse,
-    rgba(255,255,255,0.22) 0%,
-    rgba(255,255,255,0.06) 50%,
+    rgba(235,44,38,0.08) 0%,
+    rgba(235,44,38,0.02) 50%,
     transparent 70%
   );
   pointer-events: none;
@@ -317,26 +306,25 @@ const router = useRouter()
 .hero-badge {
   display: inline-block;
   padding: 5px 18px;
-  border: 1px solid rgba(255,255,255,0.7);
+  border: 1px solid var(--brand-red);
   border-radius: 20px;
   font-size: 13px;
-  color: #fff;
+  color: var(--brand-red);
   letter-spacing: 0.15em;
   margin-bottom: 28px;
-  background: rgba(255,255,255,0.12);
+  background: var(--brand-red-bg);
 }
 .hero-slogan {
   font-size: 56px;
   font-weight: 900;
-  color: #fff;
+  color: var(--text-main);
   letter-spacing: 0.12em;
   margin: 0 0 16px;
-  text-shadow: 0 2px 20px rgba(0,0,0,0.4);
   line-height: 1.15;
 }
 .hero-sub {
   font-size: 18px;
-  color: rgba(255,255,255,0.65);
+  color: var(--text-muted);
   margin: 0 0 48px;
   letter-spacing: 0.06em;
 }
@@ -347,9 +335,9 @@ const router = useRouter()
 }
 .btn-primary-lg {
   padding: 14px 42px;
-  background: #FFFFFF;
+  background: var(--brand-red);
   border: none;
-  color: var(--brand-red);
+  color: #fff;
   border-radius: 4px;
   font-size: 16px;
   font-weight: 700;
@@ -359,19 +347,20 @@ const router = useRouter()
   display: flex;
   align-items: center;
   gap: 8px;
-  transition: transform 0.2s, box-shadow 0.2s;
-  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
+  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
+  box-shadow: 0 4px 14px rgba(235,44,38,0.3);
 }
 .btn-primary-lg:hover {
   transform: translateY(-2px);
-  box-shadow: 0 8px 28px rgba(0,0,0,0.28);
+  background: var(--brand-red-2);
+  box-shadow: 0 8px 22px rgba(235,44,38,0.4);
 }
 .btn-arrow { font-size: 18px; }
 .btn-secondary-lg {
   padding: 14px 42px;
   background: transparent;
-  border: 1px solid rgba(255,255,255,0.45);
-  color: rgba(255,255,255,0.85);
+  border: 1px solid var(--brand-red);
+  color: var(--brand-red);
   border-radius: 4px;
   font-size: 16px;
   cursor: pointer;
@@ -380,9 +369,9 @@ const router = useRouter()
   transition: all 0.2s;
 }
 .btn-secondary-lg:hover {
-  border-color: rgba(255,255,255,0.8);
-  color: #fff;
-  background: rgba(255,255,255,0.06);
+  background: var(--brand-red-bg);
+  color: var(--brand-red-2);
+  border-color: var(--brand-red-2);
 }
 
 .scroll-hint {
@@ -395,7 +384,7 @@ const router = useRouter()
   flex-direction: column;
   align-items: center;
   gap: 6px;
-  color: rgba(255,255,255,0.35);
+  color: var(--text-muted);
   font-size: 12px;
   letter-spacing: 0.1em;
 }