feat: harden phase one workflows

miniapp/miniprogram/pages/second-hand/index.wxss

@@ -1,3 +1,68 @@
-.ghost {
-  margin-top: 16rpx;
+.page-heading {
+  align-items: flex-start;
+  gap: 18rpx;
+}
+
+.search-row {
+  display: flex;
+  gap: 14rpx;
+  align-items: center;
+  margin-bottom: 22rpx;
+}
+
+.search-input {
+  flex: 1;
+  margin: 0;
+}
+
+.search-button {
+  width: 132rpx;
+  margin: 0;
+  min-height: 80rpx;
+}
+
+.publish-button {
+  width: 124rpx;
+  margin: 8rpx 0 0;
+}
+
+.second-grid {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: 18rpx;
+}
+
+.second-card {
+  overflow: hidden;
+  background: #ffffff;
+  border: 1rpx solid #e4eaf0;
+  border-radius: 16rpx;
+  box-shadow: 0 8rpx 24rpx rgba(20, 36, 58, 0.05);
+}
+
+.second-cover {
+  width: 100%;
+  height: 210rpx;
+}
+
+.second-body {
+  padding: 18rpx;
+  display: flex;
+  flex-direction: column;
+  gap: 12rpx;
+}
+
+.second-desc {
+  min-height: 72rpx;
+  display: -webkit-box;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
+}
+
+.contact-button {
+  min-width: 92rpx;
+  margin: 0;
+  padding: 0 12rpx;
 }