style(frontend): 全站背景图 webp 化(bg.jpg 4MB→251KB 压缩 + bg.webp)＋品牌工具页默认策略调优（品牌检测默认改精确匹配 Simple、Terms 后置）＋任务面板/登录页/亚马逊控制台观感微调

frontend-vue/src/pages/brand/components/BrandDedupeTab.vue

@@ -492,7 +492,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
 <style scoped>
 .module-page {
   min-height: 100vh;
-  background: #151a25;
+  background: #242424;
 }
 
 .main-content {
@@ -503,7 +503,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
 
 .left-panel {
   width: 380px;
-  background: #1c2333;
+  background: #242424;
   padding: 20px;
   overflow-y: auto;
   border-right: 1px solid #2e3a52;
@@ -514,7 +514,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
   display: flex;
   flex-direction: column;
   min-width: 0;
-  background: #151a25;
+  background: #242424;
 }
 
 .section-title {
@@ -528,14 +528,14 @@ async function batchDeleteHistory(views: TaskItemView[]) {
   border-radius: 10px;
   padding: 24px;
   text-align: center;
-  background: #2e3a52;
+  background: #242424;
   margin-bottom: 20px;
   transition: all 0.2s ease;
 }
 
 .upload-zone:hover {
   border-color: #3498db;
-  background: #2e3a52;
+  background: #242424;
 }
 
 .hint {
@@ -565,7 +565,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
   padding: 8px 16px;
   font-size: 13px;
   color: #c8d2e2;
-  background: #2e3a52;
+  background: #242424;
   border: 1px solid #3e4a62;
   border-radius: 6px;
 }
@@ -607,7 +607,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
 .column-option-group {
   padding: 14px;
   border-radius: 10px;
-  background: #2e3a52;
+  background: #242424;
   border: 1px solid #2e3a52;
 }
 
@@ -682,7 +682,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
   cursor: pointer;
   padding: 10px 12px;
   border-radius: 8px;
-  background: #2e3a52;
+  background: #242424;
   border: 1px solid #2e3a52;
   margin-bottom: 8px;
   transition: all 0.2s ease;
@@ -690,7 +690,7 @@ async function batchDeleteHistory(views: TaskItemView[]) {
 
 .radio-item:hover,
 .radio-item.active {
-  background: #2e3a52;
+  background: #242424;
   border-color: #3e4a62;
 }