:root {
  --blue: #0A6CBF;
  --blue-deep: #085CA6;
  --dark: #052B4A;
  --navy: #0E3A66;
  --teal: #0E8F9E;
  --bg: #F4F7FB;
  --line: #E3EAF2;
  --text: #2A3441;
  --muted: #6B7A8C;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(10, 60, 110, 0.08);
  --shadow-lg: 0 14px 40px rgba(10, 60, 110, 0.14);
  --font: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
          "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: color .25s; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { line-height: 1.35; font-weight: 700; color: var(--dark); }

.container { width: 1440px; max-width: 92%; margin: 0 auto; }
.blue { color: var(--blue); }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-block;
  padding: 11px 30px;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .28s;
}
.btn-blue { background: var(--blue); color: #fff; box-shadow: 0 4px 14px rgba(10,108,191,.32); }
.btn-blue:hover { background: var(--blue-deep); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(10,108,191,.4); }
.btn-outline { border-color: rgba(255,255,255,.75); color: #fff; background: transparent; }
.btn-outline:hover { background: #fff; color: var(--blue); }
.btn-ghost { border-color: var(--blue); color: var(--blue); background: transparent; }
.btn-ghost:hover { background: var(--blue); color: #fff; }

/* ---------- 区块标题 ---------- */
.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head .en {
  display: block;
  font-size: 13px;
  letter-spacing: 5px;
  color: var(--blue);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 6px;
}
.sec-head h2 { font-size: 30px; }
.sec-head .bar {
  width: 46px; height: 3px;
  background: var(--blue);
  margin: 14px auto 0;
  border-radius: 2px;
  position: relative;
}
.sec-head .bar::after {
  content: ""; position: absolute;
  left: 52px; top: 0; width: 12px; height: 3px;
  background: var(--teal); border-radius: 2px;
}
.sec-head p { color: var(--muted); margin-top: 12px; font-size: 14px; }

/* =========================================================
   顶部工具条
   ========================================================= */
.topbar { background: var(--dark); color: rgba(255,255,255,.82); font-size: 13px; }
.topbar .container { display: flex; justify-content: space-between; align-items: center; height: 36px; }
.topbar a { color: rgba(255,255,255,.82); }
.topbar a:hover { color: #fff; }
.topbar .tb-right span { margin-left: 22px; }

/* ---------- 主导航 ---------- */
.header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 999;
  box-shadow: 0 2px 10px rgba(5,43,74,.05);
}
.header .container { display: flex; align-items: center; height: 82px; }
.logo { display: flex; align-items: center; flex-shrink: 0; }
.logo img { height: 58px; width: auto; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav > li { position: relative; }
.nav > li > a {
  display: block; padding: 30px 16px;
  font-size: 15.5px; font-weight: 600;
  color: var(--dark); position: relative;
}
.nav > li > a::after {
  content: ""; position: absolute;
  left: 16px; right: 16px; bottom: 20px;
  height: 3px; border-radius: 2px;
  background: var(--blue);
  transform: scaleX(0); transition: transform .28s;
}
.nav > li > a:hover, .nav > li.active > a { color: var(--blue); }
.nav > li > a:hover::after, .nav > li.active > a::after { transform: scaleX(1); }
/* 下拉菜单 */
.nav .dropdown {
  position: absolute; left: 0; top: 100%;
  min-width: 180px; background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  padding: 10px 0;
  opacity: 0; visibility: hidden;
  transform: translateY(12px);
  transition: all .28s;
  z-index: 100;
}
.nav li:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav .dropdown a {
  display: block; padding: 9px 22px; font-size: 14px; color: var(--text);
}
.nav .dropdown a:hover { color: var(--blue); background: var(--bg); }
.nav .has-sub > a i { font-style: normal; font-size: 11px; margin-left: 4px; color: var(--muted); }

/* 汉堡按钮 */
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 26px; height: 3px; background: var(--dark); border-radius: 2px; transition: all .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* =========================================================
   轮播 Banner（首页）
   ========================================================= */
.carousel { position: relative; overflow: hidden; background: var(--dark); }
.carousel .slide { display: none; }
.carousel .slide.active { display: block; animation: fadeIn 1s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.slide .slide-bg {
  width: 100%; height: 560px; object-fit: cover;
  animation: zoomSlow 9s ease forwards;
}
@keyframes zoomSlow { from { transform: scale(1.06); } to { transform: scale(1); } }
.slide .slide-content {
  position: absolute; left: 0; right: 0; top: 0; bottom: 0;
  display: flex; flex-direction: column; justify-content: center;
  color: #fff;
}
.slide .slide-inner { max-width: 1440px; margin: 0 auto; width: 92%; }
.slide .tag {
  display: inline-block;
  border: 1px solid rgba(255,255,255,.55);
  border-radius: 30px;
  padding: 5px 18px; font-size: 13px; letter-spacing: 2px;
  margin-bottom: 22px; color: rgba(255,255,255,.9);
}
.slide h2 { color: #fff; font-size: 46px; font-weight: 800; letter-spacing: 2px; margin-bottom: 18px; }
.slide h2 em { font-style: normal; color: #4FC3FF; }
.slide p { color: rgba(255,255,255,.88); font-size: 17px; max-width: 560px; margin-bottom: 34px; }
.slide .btns { display: flex; gap: 16px; }

/* 轮播指示器 */
.carousel .dots {
  position: absolute; bottom: 26px; left: 0; right: 0;
  display: flex; justify-content: center; gap: 10px; z-index: 5;
}
.carousel .dots span {
  width: 34px; height: 4px; border-radius: 2px;
  background: rgba(255,255,255,.4); cursor: pointer; transition: all .3s;
}
.carousel .dots span.active { background: #fff; width: 52px; }
.carousel .arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.5);
  color: #fff; background: rgba(5,43,74,.25);
  font-size: 20px; cursor: pointer; z-index: 5;
  display: flex; align-items: center; justify-content: center;
  transition: all .3s; backdrop-filter: blur(4px);
}
.carousel .arrow:hover { background: var(--blue); border-color: var(--blue); }
.carousel .arrow.prev { left: 26px; }
.carousel .arrow.next { right: 26px; }

/* =========================================================
   首页区块
   ========================================================= */
.section { padding: 74px 0; }
.section.gray { background: var(--bg); }
.section.blue-band { background: linear-gradient(120deg, var(--dark) 0%, var(--navy) 55%, var(--blue) 130%); color: #fff; }

/* 首页顶部快捷条 */
.quick-bar { margin-top: -40px; position: relative; z-index: 10; }
.quick-bar .container { background: #fff; border-radius: 14px; box-shadow: var(--shadow-lg); display: grid; grid-template-columns: repeat(4, 1fr); overflow: hidden; }
.quick-bar .qb-item { padding: 26px 24px; text-align: center; border-right: 1px solid var(--line); transition: all .3s; }
.quick-bar .qb-item:last-child { border-right: none; }
.quick-bar .qb-item:hover { background: var(--bg); }
.quick-bar .qb-item .num { font-size: 30px; font-weight: 800; color: var(--blue); }
.quick-bar .qb-item .num small { font-size: 15px; }
.quick-bar .qb-item .lbl { color: var(--muted); font-size: 13.5px; margin-top: 2px; }

/* 产品卡片 */
.card-product {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: all .32s;
}
.card-product:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(10,108,191,.35); }
.card-product .p-img { background: #fff; text-align: center; position: relative; overflow: hidden; }
.card-product .p-img img { width: 100%; height: auto; object-fit: contain; transition: transform .4s; }
.card-product:hover .p-img img { transform: scale(1.06); }
.card-product .p-tag {
  position: absolute; left: 14px; top: 14px;
  background: var(--blue); color: #fff; font-size: 12px;
  padding: 3px 12px; border-radius: 20px; z-index: 2;
}
.card-product .p-body { padding: 18px 20px 22px; border-top: 1px solid var(--line); }
.card-product h3 { font-size: 17px; margin-bottom: 6px; }
.card-product h3 a:hover { color: var(--blue); }
.card-product .p-desc { color: var(--muted); font-size: 13.5px; height: 42px; overflow: hidden; }
.card-product .p-more { color: var(--blue); font-size: 13.5px; font-weight: 600; margin-top: 10px; display: inline-block; }
.card-product .p-more:hover { letter-spacing: 1px; }

.grid-products { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }

/* 优势块 */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.feature { background: #fff; border-radius: var(--radius); padding: 34px 26px; text-align: center; border: 1px solid var(--line); transition: all .32s; }
.feature:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.feature .ico {
  width: 66px; height: 66px; margin: 0 auto 18px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(10,108,191,.12), rgba(14,143,158,.12));
  color: var(--blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; font-weight: 800;
}
.feature h3 { font-size: 17px; margin-bottom: 8px; }
.feature p { color: var(--muted); font-size: 13.5px; }

/* 数据统计条 */
.stat-band { padding: 0; }
.stat-band .stats { display: grid; grid-template-columns: repeat(4, 1fr); padding: 56px 0; }
.stats .stat { text-align: center; color: #fff; border-left: 1px solid rgba(255,255,255,.16); }
.stats .stat:first-child { border-left: none; }
.stats .stat .n { font-size: 44px; font-weight: 800; line-height: 1.2; }
.stats .stat .n em { font-style: normal; color: #5BC8FF; }
.stats .stat .t { color: rgba(255,255,255,.75); font-size: 14px; letter-spacing: 1px; }

/* 新闻卡片 */
.grid-news { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card-news { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: all .32s; }
.card-news:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.card-news .n-img { overflow: hidden; }
.card-news .n-img img { width: 100%; height: 190px; object-fit: cover; transition: transform .45s; }
.card-news:hover .n-img img { transform: scale(1.07); }
.card-news .n-body { padding: 20px 22px 24px; }
.card-news .n-date { font-size: 12.5px; color: var(--blue); display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.card-news .n-date .line { flex: 1; height: 1px; background: var(--line); }
.card-news h3 { font-size: 16.5px; margin-bottom: 8px; }
.card-news h3 a:hover { color: var(--blue); }
.card-news .n-desc { color: var(--muted); font-size: 13.5px; height: 42px; overflow: hidden; }

/* 首页 CTA 横幅 */
.cta-band { text-align: center; }
.cta-band h2 { color: #fff; font-size: 30px; margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,.8); margin-bottom: 30px; font-size: 15px; }
.cta-band .btn { margin: 0 8px; }

/* =========================================================
   内页通用
   ========================================================= */
.page-hero {
  position: relative; color: #fff;
  background: linear-gradient(120deg, var(--dark) 0%, var(--navy) 60%, var(--blue) 140%);
  padding: 64px 0 58px; text-align: center;
  overflow: hidden;
}
.page-hero::after {
  content: ""; position: absolute; right: -80px; top: -120px;
  width: 380px; height: 380px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.14);
  box-shadow: 0 0 0 46px rgba(255,255,255,.05), 0 0 0 100px rgba(255,255,255,.03);
}
.page-hero::before {
  content: ""; position: absolute; left: -100px; bottom: -160px;
  width: 300px; height: 300px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.10);
}
.page-hero h1, .hero-title { color: #fff; font-size: 34px; letter-spacing: 3px; position: relative; z-index: 2; }
.page-hero .crumb { margin-top: 14px; font-size: 13.5px; color: rgba(255,255,255,.7); position: relative; z-index: 2; }
.page-hero .crumb a:hover { color: #fff; }
.page-hero .crumb i { font-style: normal; margin: 0 8px; color: rgba(255,255,255,.45); }

/* 通用内容区块 */
.page-main { padding: 60px 0 74px; background: var(--bg); }
.page-main .container { background: #fff; border-radius: 14px; padding: 44px; box-shadow: var(--shadow); }

/* 侧栏布局 */
.layout { display: grid; grid-template-columns: 270px 1fr; gap: 30px; align-items: start; }
.sidebar { position: sticky; top: 104px; }
.side-card { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-bottom: 24px; }
.side-card .s-title { background: var(--dark); color: #fff; padding: 15px 20px; font-size: 16px; font-weight: 700; letter-spacing: 1px; }
.side-card .s-title i { font-style: normal; color: #5BC8FF; margin-right: 6px; }
.side-card ul li a { display: block; padding: 12px 20px; font-size: 14.5px; border-bottom: 1px dashed var(--line); color: var(--text); }
.side-card ul li a:hover, .side-card ul li.active a { color: var(--blue); background: var(--bg); padding-left: 26px; }
.side-card ul li:last-child a { border-bottom: none; }
.side-card .s-contact { padding: 20px; font-size: 13.5px; color: var(--muted); }
.side-card .s-contact .tel { font-size: 22px; color: var(--blue); font-weight: 800; margin: 6px 0; }
.side-card .s-contact .tel small { font-size: 12px; color: var(--muted); font-weight: 400; display: block; }

/* 筛选标签 */
.filter-tabs { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 30px; }
.filter-tabs a {
  padding: 8px 22px; border-radius: 30px; font-size: 14px;
  border: 1px solid var(--line); background: #fff; color: var(--text);
  transition: all .25s;
}
.filter-tabs a:hover, .filter-tabs a.active { background: var(--blue); color: #fff; border-color: var(--blue); }

/* 分页 */
.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 44px; }
.pagination a, .pagination span {
  min-width: 40px; height: 40px; padding: 0 12px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 8px; border: 1px solid var(--line);
  background: #fff; font-size: 14px; color: var(--text);
}
.pagination a:hover { border-color: var(--blue); color: var(--blue); }
.pagination .cur { background: var(--blue); color: #fff; border-color: var(--blue); }

/* 新闻列表 */
.news-list li { display: flex; align-items: center; gap: 24px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.news-list li:first-child { padding-top: 4px; }
.news-list .th { flex-shrink: 0; width: 220px; border-radius: 10px; overflow: hidden; }
.news-list .th img { width: 220px; height: 138px; object-fit: cover; transition: transform .4s; }
.news-list li:hover .th img { transform: scale(1.06); }
.news-list .info { flex: 1; }
.news-list .info h3 { font-size: 18px; margin-bottom: 8px; }
.news-list .info h3 a:hover { color: var(--blue); }
.news-list .info .d { color: var(--muted); font-size: 13.5px; margin-bottom: 8px; }
.news-list .info .d i { font-style: normal; color: var(--blue); margin-right: 6px; }
.news-list .info p { color: var(--muted); font-size: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-list .info .go { color: var(--blue); font-size: 13px; font-weight: 600; }

/* 文章页 */
.article h1 { font-size: 26px; margin-bottom: 14px; }
.article .meta { display: flex; flex-wrap: wrap; gap: 20px; color: var(--muted); font-size: 13px; padding-bottom: 18px; border-bottom: 1px solid var(--line); margin-bottom: 26px; }
.article .content { font-size: 15px; line-height: 2; }
.article .content h2 { font-size: 20px; margin: 30px 0 14px; padding-left: 12px; border-left: 4px solid var(--blue); }
.article .content h3 { font-size: 17px; margin: 24px 0 10px; }
.article .content p { margin-bottom: 16px; }
.article .content img { border-radius: 10px; margin: 16px auto; }
.article .content ul { margin-bottom: 16px; padding-left: 22px; }
.article .content ul li { list-style: disc; margin-bottom: 6px; }
.article .page-nav { display: flex; justify-content: space-between; margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 14px; }
.article .page-nav a:hover { color: var(--blue); }
.article .page-nav .na { color: var(--muted); }

/* 表格（参数表） */
.spec-table { width: 100%; border-collapse: collapse; margin: 20px 0 30px; font-size: 14px; }
.spec-table th, .spec-table td { border: 1px solid var(--line); padding: 11px 16px; text-align: left; }
.spec-table th { background: var(--dark); color: #fff; font-weight: 600; }
.spec-table tr:nth-child(even) td { background: var(--bg); }

/* 产品详情 */
.prod-detail { display: grid; grid-template-columns: 420px 1fr; gap: 40px; }
.prod-detail .gallery { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 24px; text-align: center; align-self: start; }
.prod-detail .gallery img { width: 100%; height: 360px; object-fit: contain; }
.prod-detail .gallery .caps { margin-top: 16px; font-size: 13px; color: var(--muted); }
.prod-detail .pd-info h1 { font-size: 26px; margin-bottom: 10px; }
.prod-detail .pd-info .sub { color: var(--muted); font-size: 14px; margin-bottom: 18px; }
.prod-detail .pd-info .desc { padding: 18px 20px; background: var(--bg); border-radius: 10px; border-left: 4px solid var(--blue); margin-bottom: 22px; font-size: 14.5px; }
.prod-detail .pd-info ul li { padding: 9px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; display: flex; gap: 10px; }
.prod-detail .pd-info ul li i { font-style: normal; color: var(--blue); font-weight: 800; }
.prod-detail .pd-info .btns { display: flex; gap: 14px; margin-top: 26px; flex-wrap: wrap; }

/* 关于页 */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.about-intro .ai-pics { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.about-intro .ai-pics img { border-radius: 12px; box-shadow: var(--shadow); height: 210px; object-fit: cover; width: 100%; }
.about-intro .ai-pics img:first-child { grid-column: 1 / -1; height: 240px; }
.about-intro h2 { font-size: 26px; margin-bottom: 16px; }
.about-intro h2 em { font-style: normal; color: var(--blue); }
.about-intro p { color: var(--muted); margin-bottom: 14px; font-size: 14.5px; }

/* 历程时间轴 */
.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--blue), var(--teal)); }
.timeline li { position: relative; padding: 0 0 30px 20px; }
.timeline li::before { content: ""; position: absolute; left: -30px; top: 6px; width: 16px; height: 16px; border-radius: 50%; background: #fff; border: 4px solid var(--blue); box-shadow: 0 0 0 4px rgba(10,108,191,.12); }
.timeline .yr { color: var(--blue); font-weight: 800; font-size: 17px; }
.timeline p { color: var(--muted); font-size: 14px; }

/* 证书墙 */
.certs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; text-align: center; }
.certs .cert { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 26px 16px; transition: all .3s; }
.certs .cert:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.certs .cert img { width: 96px; margin: 0 auto 14px; }
.certs .cert h4 { font-size: 16px; }
.certs .cert p { color: var(--muted); font-size: 13px; }

/* 联系方式页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 40px; }
.contact-info .ci { display: flex; gap: 18px; padding: 20px 0; border-bottom: 1px dashed var(--line); }
.contact-info .ci .ic {
  width: 52px; height: 52px; flex-shrink: 0; border-radius: 12px;
  background: linear-gradient(135deg, var(--blue), var(--teal));
  color: #fff; font-size: 22px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.contact-info .ci h4 { font-size: 15px; margin-bottom: 4px; }
.contact-info .ci p { color: var(--muted); font-size: 14px; }
.contact-info .ci .big { font-size: 20px; color: var(--blue); font-weight: 800; }
.contact-form { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 30px; }
.contact-form h3 { font-size: 19px; margin-bottom: 6px; }
.contact-form .sub { color: var(--muted); font-size: 13px; margin-bottom: 22px; }
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; border: 1px solid var(--line); border-radius: 8px;
  padding: 12px 14px; font-size: 14px; font-family: var(--font);
  background: #fff; color: var(--text); outline: none; transition: border .25s;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { border-color: var(--blue); }
.contact-form .f-item { margin-bottom: 16px; }
.contact-form textarea { height: 120px; resize: vertical; }
.contact-form .btn { width: 100%; margin-top: 6px; }

/* 地图占位 */
.map-box { margin-top: 54px; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); position: relative; }
.map-box iframe { width: 100%; height: 380px; border: 0; display: block; filter: saturate(.85); }
.map-box .map-tip {
  position: absolute; left: 20px; top: 20px; background: #fff;
  border-radius: 10px; padding: 14px 18px; box-shadow: var(--shadow-lg);
  font-size: 13.5px; max-width: 260px; z-index: 3;
}
.map-box .map-tip b { color: var(--blue); }

/* =========================================================
   页脚
   ========================================================= */
.footer { background: var(--dark); color: rgba(255,255,255,.72); padding: 60px 0 0; font-size: 14px; }
.footer .f-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 44px; padding-bottom: 40px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 20px; position: relative; padding-bottom: 12px; }
.footer h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 30px; height: 3px; background: var(--blue); border-radius: 2px; }
.footer .f-about p { margin: 16px 0; font-size: 13.5px; line-height: 2; }
.footer ul li { padding: 6px 0; }
.footer ul li a:hover { color: #fff; padding-left: 6px; }
.footer ul li a::before { content: "›"; margin-right: 8px; color: var(--blue); }
.footer .f-contact li { display: flex; gap: 10px; padding: 6px 0; }
.footer .f-contact li i { font-style: normal; color: #5BC8FF; }
.footer .qrcode { display: flex; align-items: center; gap: 18px; }
.footer .qrcode .qr { width: 104px; height: 104px; background: #fff; border-radius: 8px; padding: 8px; }
.footer .qrcode .qr img { width: 100%; }
.footer .qrcode p { font-size: 12.5px; color: rgba(255,255,255,.6); line-height: 1.8; }
.footer .copyright { border-top: 1px solid rgba(255,255,255,.1); padding: 18px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,.5); }
.footer .copyright a { color: rgba(255,255,255,.6); }
.footer .copyright a:hover { color: #fff; }

/* 回到顶部 */
.backtop {
  position: fixed; right: 24px; bottom: 60px; z-index: 90;
  width: 44px; height: 44px; border-radius: 10px;
  background: var(--blue); color: #fff; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 16px rgba(10,108,191,.35);
  cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: all .3s;
}
.backtop.show { opacity: 1; visibility: visible; transform: translateY(0); }
.backtop:hover { background: var(--blue-deep); }

/* 二维码占位图（生成：二维码图案风格） */
.qr-img { width: 100%; height: 100%; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1024px) {
  .grid-products { grid-template-columns: repeat(3, 1fr); }
  .features { grid-template-columns: repeat(2, 1fr); }
  .grid-news { grid-template-columns: repeat(2, 1fr); }
  .prod-detail { grid-template-columns: 1fr; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .slide h2 { font-size: 36px; }
}

@media (max-width: 768px) {
  .topbar .tb-right { display: none; }
  .header .container { height: 68px; }
  .logo img { height: 46px; }
  .nav-toggle { display: flex; margin-left: auto; }
  .nav {
    position: fixed; top: 68px; left: 0; right: 0; bottom: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 20px 6%; overflow-y: auto;
    transform: translateX(100%); transition: transform .35s;
    z-index: 998; gap: 0;
  }
  .nav.open { transform: translateX(0); box-shadow: -8px 0 30px rgba(5,43,74,.12); }
  .nav > li > a { padding: 15px 10px; border-bottom: 1px solid var(--line); }
  .nav > li > a::after { display: none; }
  .nav .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; border-radius: 0; padding: 0 0 6px 18px; }
  .slide .slide-bg { height: 420px; }
  .slide h2 { font-size: 28px; }
  .slide p { font-size: 14.5px; }
  .carousel .arrow { display: none; }
  .quick-bar { margin-top: -24px; }
  .quick-bar .container { grid-template-columns: repeat(2, 1fr); }
  .quick-bar .qb-item { border-bottom: 1px solid var(--line); }
  .section { padding: 52px 0; }
  .sec-head h2 { font-size: 24px; }
  .grid-products, .grid-news { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .stats .stat .n { font-size: 32px; }
  .page-hero { padding: 46px 0 42px; }
  .page-hero h1 { font-size: 26px; }
  .page-main .container { padding: 24px 18px; }
  .news-list li { flex-direction: column; align-items: flex-start; gap: 14px; }
  .news-list .th, .news-list .th img { width: 100%; height: 180px; }
  .about-intro { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-form .row { grid-template-columns: 1fr; }
  .certs { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .footer .f-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .footer .f-about { grid-column: 1 / -1; }
}

@media (max-width: 480px) {
  .grid-products, .grid-news, .features { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); row-gap: 30px; }
  .stats .stat:nth-child(3) { border-left: none; }
  .prod-detail .gallery img { height: 240px; }
  .map-box iframe { height: 300px; }
}