/* =============================================
   DedeCMS 主题样式 — 现代化重构版
   =============================================
   使用方法：将此文件替换 /media/css/style.css
   依赖：Bootstrap 5、Font Awesome 6、Swiper 8+
   ============================================= */

/* ===== CSS 变量（主题色在此修改）===== */
:root {
  --primary:        #1a6fc4;
  --primary-dark:   #145ba3;
  --primary-light:  #e8f1fb;
  --accent:         #f5a623;
  --text-main:      #1f2937;
  --text-muted:     #6b7280;
  --text-light:     #ffffff;
  --bg-light:       #f8f9fa;
  --bg-dark:        #111827;
  --border:         #e5e7eb;
  --shadow-sm:      0 1px 4px rgba(0,0,0,.06);
  --shadow:         0 2px 12px rgba(0,0,0,.09);
  --shadow-hover:   0 8px 28px rgba(0,0,0,.14);
  --radius:         8px;
  --radius-lg:      16px;
  --transition:     all .28s cubic-bezier(.4,0,.2,1);
  --nav-h:          68px;
  --font:           'PingFang SC','Microsoft YaHei','Hiragino Sans GB',system-ui,sans-serif;
}

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text-main);
  background: #fff;
  line-height: 1.75;
  padding-top: var(--nav-h);
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; margin: 0; padding: 0; }
h1,h2,h3,h4,h5 { font-family: var(--font); }

/* ===== 间距工具 ===== */
.pt20{padding-top:20px}.pt30{padding-top:30px}.pt40{padding-top:40px}
.pb20{padding-bottom:20px}.pb30{padding-bottom:30px}.pb40{padding-bottom:40px}

/* ===============================
   导航栏
   =============================== */
.nav-wrapper {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
  transition: box-shadow .3s;
}
.nav-wrapper.scrolled { box-shadow: 0 4px 20px rgba(0,0,0,.12); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
  gap: 16px;
}
.logo a { display: flex; align-items: center; }
.logo img { height: 46px; width: auto; object-fit: contain; }

/* 桌面导航 */
.top-nav { display: flex; align-items: center; }
.top-nav > ul { display: flex; align-items: center; gap: 2px; }
.top-nav > ul > li { position: relative; }
.top-nav > ul > li > a {
  display: flex; align-items: center; gap: 5px;
  padding: 8px 15px;
  font-size: 15px;
  color: var(--text-main);
  border-radius: var(--radius);
  font-weight: 500;
}
.top-nav > ul > li > a:hover,
.top-nav > ul > li.active > a {
  color: var(--primary);
  background: var(--primary-light);
}
.top-nav > ul > li > a .fa-angle-down {
  font-size: 11px;
  transition: transform .3s;
}
.top-nav > ul > li:hover > a .fa-angle-down { transform: rotate(180deg); }

/* 下拉菜单 */
.nav-dropdown {
  position: absolute;
  top: 100%;           /* 紧贴父项底部，无真实空隙，防止鼠标经过间隙时 hover 丢失 */
  left: 50%;
  min-width: 150px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-hover);
  padding: 12px 0 6px; /* 顶部 padding 替代原来的 gap，视觉上仍有间距但 hover 区域连续 */
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-6px);
  transition: opacity .22s, transform .22s;
}
.top-nav > ul > li:hover .nav-dropdown {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown a {
  display: block;
  padding: 9px 18px;
  font-size: 14px;
  color: var(--text-main);
  white-space: nowrap;
}
.nav-dropdown a:hover { color: var(--primary); background: var(--primary-light); }

/* 无子栏目时隐藏空下拉框和箭头
   注意：DedeCMS 无子栏目时 nav-dropdown 内仍含空白字符，:empty 无效。
   改由 JS（comon.js fixEmptyDropdowns）检测并注入 .nav-dropdown--empty 类。*/
.nav-dropdown--empty { display: none !important; }
.top-nav > ul > li:has(.nav-dropdown--empty) > a .fa-angle-down { display: none; }

/* 汉堡按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  border-radius: var(--radius);
  transition: background .2s;
}
.hamburger:hover { background: var(--bg-light); }
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端抽屉 */
.mobile-nav {
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background: #fff;
  box-shadow: 0 6px 20px rgba(0,0,0,.1);
  z-index: 998;
  max-height: calc(100vh - var(--nav-h));
  overflow-y: auto;
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity .25s, transform .25s;
}
.mobile-nav.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
.mobile-nav ul { padding: 8px 0 16px; }
.mobile-nav li a {
  display: block;
  padding: 13px 20px;
  font-size: 15px;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
}
.mobile-nav li:last-child a { border-bottom: none; }
.mobile-nav li a:hover,
.mobile-nav li.active a { color: var(--primary); background: var(--primary-light); }

@media (max-width: 991px) {
  .top-nav { display: none; }
  .hamburger { display: flex; }
}

/* ===============================
   轮播 Banner
   =============================== */
.banner-swiper { width: 100%; overflow: hidden; background: #000; }
.banner-swiper .swiper-slide img {
  width: 100%; height: 560px;
  object-fit: cover;
  opacity: .95;
}
.banner-swiper .swiper-pagination-bullet { background: rgba(255,255,255,.6); }
.banner-swiper .swiper-pagination-bullet-active { background: #fff; }
.banner-swiper .swiper-button-next,
.banner-swiper .swiper-button-prev { color: #fff; }
.banner-swiper .swiper-button-next::after,
.banner-swiper .swiper-button-prev::after { font-size: 22px; }

@media (max-width: 767px) {
  .banner-swiper .swiper-slide img { height: 220px; }
  .banner-swiper .swiper-button-next,
  .banner-swiper .swiper-button-prev { display: none; }
}
@media (min-width: 768px) and (max-width: 991px) {
  .banner-swiper .swiper-slide img { height: 360px; }
}

/* 内页顶部图 */
.page-banner { width: 100%; overflow: hidden; }
.page-banner img { width: 100%; height: 280px; object-fit: cover; }
@media (max-width: 767px) { .page-banner img { height: 140px; } }

/* ===============================
   面包屑
   =============================== */
.breadcrumb-bar {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 11px 0;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb-bar a { color: var(--text-muted); }
.breadcrumb-bar a:hover { color: var(--primary); }

/* ===============================
   区块标题
   =============================== */
.section-title {
  text-align: center;
  font-size: 26px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin: 0;
}
.section-title p {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 400;
}
.section-title-line {
  display: block;
  width: 36px; height: 3px;
  background: var(--primary);
  border-radius: 2px;
  margin: 12px auto 0;
}

/* ===============================
   首页各区块
   =============================== */

/* main1 广告区 */
.main1 { background: var(--bg-light); }
.main1 img { border-radius: var(--radius); }

/* main2 简介区 */
.main2 { background: #fff; }
.main2 .jj {
  font-size: 15px;
  line-height: 1.9;
  color: #4b5563;
  width: 100%;        /* 显式撑满 container 内容区 */
  max-width: 100%;
  text-align: justify;
  overflow: hidden;   /* 隔离内部 max-width:1920px 视频容器的溢出影响 */
}

/* main3 产品/图片区 */
.main3 { background: var(--bg-light); }
.main3 .prod-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.main3 .prod-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.main3 .prod-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.main3 .prod-card .img-wrap { overflow: hidden; }
.main3 .prod-card .img-wrap img {
  width: 100%; height: 200px;
  object-fit: cover;
  transition: transform .5s ease;
}
.main3 .prod-card:hover .img-wrap img { transform: scale(1.06); }
.main3 .prod-card h3 {
  padding: 12px 14px;
  font-size: 14px;
  color: var(--text-main);
  text-align: center;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.main3 .prod-card h3 a { color: inherit; }
.main3 .prod-card:hover h3 a { color: var(--primary); }

@media (max-width: 991px)  { .main3 .prod-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 479px)  {
  .main3 .prod-grid { grid-template-columns: repeat(2,1fr); gap: 12px; }
  .main3 .prod-card .img-wrap img { height: 140px; }
}

/* main4 新闻区 */
.main4 { background: #fff; }
.news-card {
  border-left: 3px solid var(--primary);
  padding: 16px 20px;
  margin-bottom: 16px;
  background: var(--bg-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: var(--transition);
}
.news-card:hover { background: var(--primary-light); border-left-color: var(--primary-dark); }
.news-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 5px; }
.news-card h3 a { color: var(--text-main); }
.news-card h3 a:hover { color: var(--primary); }
.news-card .desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card .meta { font-size: 12px; color: var(--text-muted); }
.news-card .meta span { margin-right: 12px; }

/* 更多按钮 */
.btn-more {
  display: inline-block;
  padding: 10px 32px;
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: 30px;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}
.btn-more:hover { background: var(--primary); color: #fff; }

/* ===============================
   列表页（文章 / 产品）
   =============================== */
.news-section { padding: 40px 0; }

/* 文章列表 */
.left_con li {
  display: flex;
  gap: 22px;
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.left_con li:last-child { border-bottom: none; }
.media_img { flex-shrink: 0; }
.img1 {
  width: 160px; height: 110px;
  overflow: hidden;
  border-radius: var(--radius);
}
.img1 img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .45s ease;
}
.img1:hover img { transform: scale(1.07); }
.media_con { flex: 1; min-width: 0; }
.media_con h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.media_con h3 a { color: var(--text-main); }
.media_con h3 a:hover { color: var(--primary); }
.media_con p {
  font-size: 13px;
  color: #6b7280;
  line-height: 1.6;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.media_con .meta { font-size: 12px; color: var(--text-muted); }
.media_con .meta span { margin-right: 14px; }
.media_con .meta i { margin-right: 3px; }

@media (max-width: 575px) {
  .left_con li { flex-direction: column; gap: 14px; }
  .img1 { width: 100%; height: 180px; }
}

/* 产品列表 */
.shop-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.shop-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}
.shop-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.shop-card img { width: 100%; height: 200px; object-fit: cover; }
.shop-card h3 {
  padding: 12px 14px;
  font-size: 14px;
  text-align: center;
  color: var(--text-main);
  margin: 0;
}
.shop-card a:hover h3 { color: var(--primary); }

@media (max-width: 991px) { .shop-grid { grid-template-columns: repeat(3,1fr); } }
@media (max-width: 575px) {
  .shop-grid { grid-template-columns: repeat(2,1fr); gap: 12px; }
  .shop-card img { height: 140px; }
}

/* ===============================
   侧边栏
   =============================== */
.news_right {
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}
.sidebar-search {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
  background: #fff;
}
.sidebar-search .ipt {
  flex: 1;
  border: none;
  padding: 10px 14px;
  font-size: 14px;
  outline: none;
  font-family: var(--font);
  color: var(--text-main);
}
.sidebar-search .btn-search {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 0 18px;
  cursor: pointer;
  font-size: 15px;
  transition: background .25s;
}
.sidebar-search .btn-search:hover { background: var(--primary-dark); }
.sidebar-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  border-left: 3px solid var(--primary);
  padding-left: 10px;
  margin-bottom: 12px;
}
.news_right > ul li a {
  display: block;
  padding: 8px 0;
  font-size: 13px;
  color: #555;
  border-bottom: 1px dashed var(--border);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  transition: var(--transition);
}
.news_right > ul li:last-child a { border-bottom: none; }
.news_right > ul li a:hover { color: var(--primary); padding-left: 5px; }

/* 侧栏子分类菜单 */
.news_menu { margin-top: 24px; }
.news_menu a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text-main);
  border-radius: var(--radius);
  margin-bottom: 5px;
  background: var(--bg-light);
  transition: var(--transition);
}
.news_menu a:hover,
.news_menu a.on {
  background: var(--primary);
  color: #fff;
}

@media (max-width: 767px) {
  .news_right { position: static; margin-top: 32px; }
}

/* ===============================
   文章详情
   =============================== */
.article-wrap {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow);
}
.article-wrap h1 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 16px;
}
.hdwz {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 26px;
  font-size: 13px;
  color: var(--text-muted);
}
.hdwz span { display: flex; align-items: center; gap: 5px; }
.article-wrap .body-content {
  font-size: 15px;
  line-height: 1.9;
  color: #374151;
}
.article-wrap .body-content img {
  border-radius: var(--radius);
  margin: 16px auto;
  max-width: 100%;
}
.article-wrap .body-content p { margin-bottom: 14px; }

@media (max-width: 767px) {
  .article-wrap { padding: 20px 16px; border-radius: var(--radius); }
  .article-wrap h1 { font-size: 20px; }
}

/* ===============================
   单页（index_article）
   =============================== */
.danye-section { padding: 40px 0; }
.tab-swiper-wrap {
  background: var(--bg-light);
  border-radius: var(--radius);
  padding: 8px;
  margin-bottom: 28px;
  overflow: hidden;
}
.tab-swiper-wrap .swiper-slide { width: auto; }
.tab-swiper-wrap a {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: 6px;
  transition: var(--transition);
  white-space: nowrap;
}
.tab-swiper-wrap a:hover,
.tab-swiper-wrap a.on {
  background: var(--primary);
  color: #fff;
}
.danye-content {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow);
  font-size: 15px;
  line-height: 1.9;
  color: #374151;
}
@media (max-width: 767px) { .danye-content { padding: 20px 16px; } }

/* ===============================
   分页
   =============================== */
.page2 { text-align: center; }
.page2 ul { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; }
.page2 ul li a,
.page2 ul li span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 8px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-main);
  background: #fff;
  transition: var(--transition);
}
.page2 ul li a:hover,
.page2 ul li.thisclass a {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ===============================
   页顶搜索栏（list_shop）
   =============================== */
.search-bar-top {
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}
.search-bar-top .inner {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 440px;
  background: #fff;
}
.search-bar-top .inner input {
  flex: 1;
  border: none;
  padding: 10px 14px;
  font-size: 14px;
  outline: none;
  font-family: var(--font);
}
.search-bar-top .inner button {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 0 20px;
  cursor: pointer;
  transition: background .25s;
}
.search-bar-top .inner button:hover { background: var(--primary-dark); }

/* ===============================
   页脚
   =============================== */
.footer {
  background: var(--bg-dark);
  color: #9ca3af;
  padding: 52px 0 0;
}
.footer dl { margin-bottom: 8px; }
.footer dl dt { margin-bottom: 14px; }
.footer dl dt a {
  color: #f3f4f6;
  font-size: 15px;
  font-weight: 600;
}
.footer dl dd { margin-bottom: 7px; }
.footer dl dd a {
  color: #9ca3af;
  font-size: 13px;
  transition: color .2s;
}
.footer dl dd a:hover,
.footer dl dt a:hover { color: #fff; }
.footer .contact-col dt {
  color: #f3f4f6;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
}
.footer .contact-col dd { font-size: 13px; margin-bottom: 7px; }
.footer-links {
  border-top: 1px solid rgba(255,255,255,.08);
  margin-top: 36px;
  padding: 18px 0;
  font-size: 13px;
}
.footer-links span { color: #6b7280; margin-right: 10px; }
.footer-links a { color: #9ca3af; margin-right: 12px; }
.footer-links a:hover { color: #fff; }
.footer-copy {
  background: rgba(0,0,0,.25);
  padding: 16px 0;
  font-size: 12px;
  color: #6b7280;
  text-align: center;
}
.footer-copy a { color: #6b7280; }
.footer-copy a:hover { color: #9ca3af; }

/* ===============================
   返回顶部按钮
   =============================== */
#back-to-top {
  position: fixed;
  bottom: 28px; right: 24px;
  width: 42px; height: 42px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 17px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(26,111,196,.4);
  transition: var(--transition);
  z-index: 999;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
}
#back-to-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
#back-to-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

@media (max-width: 767px) {
  #back-to-top { bottom: 18px; right: 16px; width: 38px; height: 38px; font-size: 15px; }
}

/* ===============================
   Bootstrap 3 col-xs-* 兼容
   （后台广告位、编辑器内容可能含旧类名，保留兼容避免栅格失效）
   =============================== */
.col-xs-1{flex:0 0 8.333333%;max-width:8.333333%}
.col-xs-2{flex:0 0 16.666667%;max-width:16.666667%}
.col-xs-3{flex:0 0 25%;max-width:25%}
.col-xs-4{flex:0 0 33.333333%;max-width:33.333333%}
.col-xs-6{flex:0 0 50%;max-width:50%}
.col-xs-12{flex:0 0 100%;max-width:100%}
.col-xs-1,.col-xs-2,.col-xs-3,.col-xs-4,.col-xs-6,.col-xs-12{
  position:relative;padding-right:12px;padding-left:12px;
}

/* ===============================
   .title1 — DedeCMS 后台常用区块标题类
   =============================== */
.title1 {
  text-align: center;
  font-size: 26px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 0;
}
.title1 p {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 6px;
  margin-bottom: 0;
}

/* ===============================
   main1 企业文化图标区
   =============================== */
.main1 { background: var(--bg-light); }

.main1 ul.row {
  /* 改为 CSS Grid，和 .prod-grid 行为完全一致，避免 Bootstrap .row 负边距干扰 */
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.main1 ul.row > li {
  display: flex;
  flex-direction: column;
  align-items: center;     /* 水平居中 */
  justify-content: center; /* 垂直居中 */
  text-align: center;
  padding: 44px 20px 36px;
  transition: var(--transition);
}
.main1 ul.row > li:hover {
  transform: translateY(-5px);
}

/* 图标 */
.main1 ul.row > li > i,
.main1 ul.row > li > .fa,
.main1 ul.row > li > [class^="fa-"] {
  display: block;
  font-size: 68px;
  color: var(--primary);
  margin-bottom: 20px;
  transition: color .3s ease, transform .35s ease;
}
.main1 ul.row > li:hover > i,
.main1 ul.row > li:hover > .fa,
.main1 ul.row > li:hover > [class^="fa-"] {
  color: var(--accent);
  transform: scale(1.15) rotate(-5deg);
}

/* 文字 */
.main1 ul.row > li h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin: 0;
}
.main1 ul.row > li:hover h3 {
  color: var(--primary);
}

/* 移动端：2列 */
@media (max-width: 575px) {
  .main1 ul.row {
    grid-template-columns: repeat(2, 1fr); /* 手机端 2 列 */
  }
  .main1 ul.row > li { padding: 28px 12px 22px; }
  .main1 ul.row > li > i { font-size: 46px; margin-bottom: 12px; }
  .main1 ul.row > li h3 { font-size: 16px; }
}