style(index): 优化首页样式与布局

- 重新设计首页背景色与容器安全区适配
- 优化Hero Banner区域增加圆角遮罩效果
- 调整Hero Grid菜单区样式，去除背景色实现透明效果
- 新增公告条样式，自定义样式替代NutUI NoticeBar
- 优化底部购买按钮样式，调整高度及阴影
- 统一首页通用section的左右边距，融合TrustSection和ContactSection样式

src/pages/index/ContactSection.scss

@@ -1,143 +1,95 @@
 .contact-section {
-  background: #ffffff;
-  padding: 24px 16px;
-  margin: 16px 0;
-  border-radius: 16px;
-  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
-  
-  &:first-child {
-    margin-top: 0;
-  }
-  
-  &:last-child {
-    margin-bottom: 32px;
-  }
+  margin-top: 0;
+  padding: 32px 20px 24px;
+  background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
+  border-radius: 24px 24px 0 0;
+  color: #ffffff;
 
-  &__title {
-    text-align: center;
-    margin-bottom: 24px;
-    
-    &-text {
-      display: block;
-      font-size: 18px;
-      font-weight: 600;
-      color: #1e293b;
-      margin-bottom: 4px;
-    }
-  }
-
-  &__subtitle {
-    font-size: 14px;
-    color: #64748b;
-    display: block;
-  }
-
-  &__grid {
-    display: grid;
-    grid-template-columns: repeat(2, 1fr);
-    gap: 16px;
+  /* ═══ 引言区 ═══ */
+  &__intro {
     margin-bottom: 24px;
   }
 
-  &__item {
-    display: flex;
-    align-items: center;
-    padding: 16px;
-    background: #f8fafc;
-    border-radius: 12px;
-    
-    &:active {
-      background: #f1f5f9;
-      transform: scale(0.98);
-      transition: transform 0.1s;
-    }
-  }
-
-  &__icon {
-    width: 40px;
-    height: 40px;
-    border-radius: 50%;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    margin-right: 12px;
-    flex-shrink: 0;
-
-    &--blue {
-      background: rgba(59, 130, 246, 0.1);
-    }
-
-    &--green {
-      background: rgba(16, 185, 129, 0.1);
-    }
-
-    &--orange {
-      background: rgba(245, 158, 11, 0.1);
-    }
-
-    &--cyan {
-      background: rgba(6, 182, 212, 0.1);
-    }
-  }
-
-  &__content {
-    flex: 1;
-    min-width: 0;
-  }
-
-  &__item-title {
+  &__intro-title {
     display: block;
-    font-size: 14px;
-    color: #64748b;
-    margin-bottom: 4px;
+    font-size: 24px;
+    font-weight: 700;
+    color: #ffffff;
+    margin-bottom: 6px;
   }
 
-  &__item-value {
+  &__intro-desc {
     display: block;
     font-size: 15px;
-    font-weight: 600;
-    color: #1e293b;
-    white-space: nowrap;
-    overflow: hidden;
-    text-overflow: ellipsis;
+    color: rgba(255, 255, 255, 0.5);
   }
 
+  /* ═══ 操作按钮区 ═══ */
+  &__actions {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    margin-bottom: 28px;
+  }
+
+  &__action {
+    display: flex;
+    align-items: center;
+    padding: 16px 18px;
+    border-radius: 14px;
+    transition: opacity 0.2s;
+
+    &:active {
+      opacity: 0.8;
+    }
+  }
+
+  &__action--primary {
+    background: linear-gradient(135deg, #3b82f6, #2563eb);
+    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
+  }
+
+  &__action--secondary {
+    background: rgba(255, 255, 255, 0.08);
+    border: 1px solid rgba(255, 255, 255, 0.12);
+  }
+
+  &__action-text {
+    flex: 1;
+    margin-left: 14px;
+    display: flex;
+    flex-direction: column;
+  }
+
+  &__action-label {
+    font-size: 17px;
+    font-weight: 600;
+    color: #ffffff;
+    margin-bottom: 2px;
+  }
+
+  &__action-value {
+    font-size: 14px;
+    color: rgba(255, 255, 255, 0.6);
+  }
+
+  /* ═══ 底部信息 ═══ */
   &__footer {
     text-align: center;
     padding-top: 20px;
-    border-top: 1px solid #e2e8f0;
+    border-top: 1px solid rgba(255, 255, 255, 0.08);
   }
 
   &__footer-text {
     display: block;
-    font-size: 12px;
-    color: #64748b;
-    line-height: 1.6;
-    
-    &:first-child {
-      margin-bottom: 4px;
-    }
+    font-size: 14px;
+    color: rgba(255, 255, 255, 0.4);
+    margin-bottom: 4px;
+  }
+
+  &__footer-sub {
+    display: block;
+    font-size: 13px;
+    color: rgba(255, 255, 255, 0.25);
   }
 }
-
-// 响应式适配
-@media (max-width: 375px) {
-  .contact-section {
-    padding: 20px 12px;
-    margin: 12px 0;
-
-    &__grid {
-      gap: 12px;
-    }
-
-    &__item {
-      padding: 12px;
-    }
-
-    &__icon {
-      width: 36px;
-      height: 36px;
-      margin-right: 10px;
-    }
-  }
-}