feat: harden phase one workflows

miniapp/miniprogram/pages/group-buy/index.wxss

@@ -1,4 +1,51 @@
+.page-heading {
+  margin-bottom: 24rpx;
+}
+
+.group-list {
+  display: flex;
+  flex-direction: column;
+  gap: 18rpx;
+}
+
+.group-card {
+  overflow: hidden;
+  background: #ffffff;
+  border: 1rpx solid #e4eaf0;
+  border-radius: 16rpx;
+  box-shadow: 0 8rpx 24rpx rgba(20, 36, 58, 0.05);
+}
+
+.group-cover {
+  width: 100%;
+  height: 280rpx;
+}
+
+.group-body {
+  padding: 22rpx;
+}
+
 .price {
   min-width: 120rpx;
   text-align: right;
+  font-size: 34rpx;
+}
+
+.stock-line {
+  margin-top: 18rpx;
+}
+
+.stock-track {
+  height: 12rpx;
+  overflow: hidden;
+  margin-bottom: 12rpx;
+  background: #edf2f7;
+  border-radius: 999rpx;
+}
+
+.stock-fill {
+  width: 46%;
+  height: 100%;
+  background: #0f766e;
+  border-radius: 999rpx;
 }