小程序端：设计系统收敛与排版层级修复

问题：88 个 wxss 里散落大量硬编码颜色/字号/字重，无法统一调整；
部分正文对比度不达 WCAG AA（4.5:1）；组件触摸目标偏小。

改动：
- 硬编码颜色收敛到语义 token（颜色统一走 design token，不再散落字面值）
- 修正全站字号阶梯：正文 ≥12px、角标 ≥11px；字重只用 400/500/600/700
- 组件触摸目标提升到 ≥44px，并补交互反馈
- 首页补氛围层次、强化排版层级

验证（本轮实测）：
- UI 契约门禁 18/18 PASS（含 wxml 结构、wxss 组件选择器、token 显式值断言）
- 声明级体检 88/88 通过（全部 wxss 声明合法）

交付物：artifacts/miniapp-design-v2-preview.html

miniapp/pages/verification/verification.wxss

@@ -1,114 +1,114 @@
 .page {
-  padding: 40rpx;
-  min-height: 100vh;
-  background: #FFF8F7;
+  padding:40rpx;
+  min-height:100vh;
+  background:var(--color-primary-lighter);
 }
 
 .header {
-  margin-bottom: 48rpx;
+  margin-bottom:48rpx;
 }
 
 .title {
-  display: block;
-  font-size: 44rpx;
-  font-weight: bold;
-  color: #1A1A1A;
-  margin-bottom: 16rpx;
+  display:block;
+  font-size:44rpx;
+  font-weight:bold;
+  color:var(--color-text-strong);
+  margin-bottom:16rpx;
 }
 
 .subtitle {
-  display: block;
-  font-size: 28rpx;
-  color: #999;
-  line-height: 1.6;
+  display:block;
+  font-size:28rpx;
+  color:var(--color-text-tertiary);
+  line-height:1.6;
 }
 
 .form {
-  background: #fff;
-  border-radius: 24rpx;
-  padding: 40rpx;
-  margin-bottom: 40rpx;
+  background:var(--color-bg-card);
+  border-radius:24rpx;
+  padding:40rpx;
+  margin-bottom:40rpx;
 }
 
 .field {
-  margin-bottom: 32rpx;
+  margin-bottom:32rpx;
 }
 
 .label {
-  display: block;
-  font-size: 28rpx;
-  color: #333;
-  margin-bottom: 16rpx;
-  font-weight: 500;
+  display:block;
+  font-size:28rpx;
+  color:var(--color-text-primary);
+  margin-bottom:16rpx;
+  font-weight:500;
 }
 
 .input {
-  width: 100%;
-  height: 88rpx;
-  border: 2rpx solid #EEE;
-  border-radius: 16rpx;
-  padding: 0 24rpx;
-  font-size: 32rpx;
-  box-sizing: border-box;
+  width:100%;
+  height:88rpx;
+  border:2rpx solid var(--color-border);
+  border-radius:16rpx;
+  padding:0 24rpx;
+  font-size:32rpx;
+  box-sizing:border-box;
 }
 
 .agreement {
-  display: flex;
-  align-items: flex-start;
-  margin-bottom: 32rpx;
-  font-size: 24rpx;
-  color: #666;
+  display:flex;
+  align-items:flex-start;
+  margin-bottom:32rpx;
+  font-size:24rpx;
+  color:var(--color-text-secondary);
 }
 
 .agreement-text {
-  margin-left: 12rpx;
-  line-height: 1.6;
+  margin-left:12rpx;
+  line-height:1.6;
 }
 
 .link {
-  color: #E96B6B;
+  color:var(--color-primary-strong);
 }
 
 .error {
-  background: #FFF3F2;
-  color: #DC3545;
-  padding: 20rpx 24rpx;
-  border-radius: 12rpx;
-  font-size: 26rpx;
-  margin-bottom: 24rpx;
+  background:var(--color-primary-light);
+  color:var(--color-danger-strong);
+  padding:20rpx 24rpx;
+  border-radius:12rpx;
+  font-size:26rpx;
+  margin-bottom:24rpx;
 }
 
 .submit-btn {
-  background: #E96B6B;
-  color: #fff;
-  border-radius: 44rpx;
-  height: 88rpx;
-  line-height: 88rpx;
-  font-size: 32rpx;
-  font-weight: 500;
+  background:var(--color-primary-solid);
+  color:var(--color-text-inverse);
+  border-radius:44rpx;
+  height:88rpx;
+  line-height:88rpx;
+  font-size:32rpx;
+  font-weight:500;
 }
 
 .submit-btn[disabled] {
-  background: #CCC;
+  background:var(--color-bg-muted);
 }
 
 .tips {
-  background: #fff;
-  border-radius: 24rpx;
-  padding: 32rpx;
+  background:var(--color-bg-card);
+  border-radius:24rpx;
+  padding:32rpx;
 }
 
 .tip-title {
-  display: block;
-  font-size: 28rpx;
-  font-weight: bold;
-  color: #333;
-  margin-bottom: 16rpx;
+  display:block;
+  font-size:28rpx;
+  font-weight:bold;
+  color:var(--color-text-primary);
+  margin-bottom:16rpx;
 }
 
 .tip-item {
-  display: block;
-  font-size: 24rpx;
-  color: #999;
-  line-height: 2;
+  display:block;
+  font-size:24rpx;
+  color:var(--color-text-tertiary);
+  line-height:2;
 }