feat: 完成首页UI展示初版开发

miniprogram/pages/home/home.less

@@ -1,6 +1,8 @@
 @import '../../style/theme3.less';
 
 @home-padding: 28rpx;
+@home-section-mt: 48rpx;
+@home-track-gap: 16rpx;
 
 .home-page {
     min-height: 100vh;
@@ -68,12 +70,12 @@
 }
 
 .home-tabs-wrap {
-    // margin-top: 28rpx;
+    margin-top: 48rpx;
 }
 
 .home-hero-placeholder {
     // margin: 8rpx auto 0;
-    margin: 0 24rpx;
+    margin: 48rpx 24rpx 0;
     // width: 684rpx;
     height: 480rpx;
     border-radius: 40rpx;
@@ -81,13 +83,13 @@
 }
 
 .home-section-panel {
-    margin-top: 48rpx;
+    margin-top: @home-section-mt;
     padding: 0 @home-padding;
     box-sizing: border-box;
 }
 
 .home-section-panel--hot {
-    margin-top: 32rpx;
+    margin-top: @home-section-mt;
 }
 
 .home-section-head {
@@ -107,6 +109,73 @@
     color: @text-selected-btn;
 }
 
+.home-section-head__title--module {
+    font-size: 28rpx;
+    font-weight: 700;
+}
+
+.home-track-scroll {
+    margin-top: 24rpx;
+    width: 100%;
+    white-space: nowrap;
+}
+
+.home-track-row {
+    display: inline-flex;
+    flex-direction: row;
+    gap: @home-track-gap;
+    padding-right: @home-padding;
+}
+
+/* 可视约 2.2 张：2*w + 2*gap + 0.2*w ≈ 屏宽减左右 padding */
+.home-track-card {
+    width: calc((750rpx - 2 * @home-padding - 2 * @home-track-gap) / 2.2);
+    flex-shrink: 0;
+    border-radius: 24rpx;
+    overflow: hidden;
+    background: #ffffff;
+    box-shadow: 0 6rpx 20rpx rgba(50, 46, 37, 0.06);
+}
+
+.home-track-card__top {
+    height: 200rpx;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.home-track-card__icon {
+    font-size: 72rpx;
+    line-height: 1;
+}
+
+.home-track-card__body {
+    padding: 20rpx 18rpx 22rpx;
+    background: #ffffff;
+}
+
+.home-track-card__title {
+    font-size: 28rpx;
+    font-weight: 600;
+    color: @text-title;
+    line-height: 1.35;
+    display: -webkit-box;
+    -webkit-box-orient: vertical;
+    line-clamp: 2;
+    -webkit-line-clamp: 2;
+    overflow: hidden;
+}
+
+.home-track-card__sub {
+    margin-top: 8rpx;
+    font-size: 22rpx;
+    color: @text-gray;
+    line-height: 1.3;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
 .home-age-scroll {
     margin-top: 32rpx;
     width: 100%;
@@ -116,12 +185,13 @@
 .home-age-row {
     display: inline-flex;
     flex-direction: row;
-    gap: 20rpx;
+    gap: 12rpx;
     padding-right: @home-padding;
 }
 
 .home-age-item {
-    width: calc((750rpx - 48rpx - 40rpx) / 3.2);
+    /* 目标：首屏露出 3.5 个（第 4 个露出约 50%） */
+    width: calc((750rpx - 48rpx - 36rpx) / 3.5);
     display: flex;
     flex-direction: column;
     align-items: center;