:root {
  --brand: #025d92;
  --brand-dark: #014870;
  --brand-soft: #e8f2f8;
  --ink: #12202c;
  --muted: #5b6b77;
  --line: #e4ebf0;
  --bg: #f5f8fb;
  --card: #fff;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(18, 32, 44, .08);
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font: 15px/1.7 "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; border: 0; vertical-align: middle; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button, input, textarea { font: inherit; }
.wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 76px;
}
.logo img { display: block; height: 44px; width: auto; }
.nav-pc { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-pc > li { position: relative; }
.nav-pc > li > a {
  display: block;
  padding: 10px 14px;
  color: var(--ink);
  font-weight: 600;
  border-radius: 8px;
}
.nav-pc > li:hover > a,
.nav-pc > li.is-on > a { color: var(--brand); background: var(--brand-soft); }
.nav-pc .sub {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 196px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
}
.nav-pc > li:hover .sub { display: block; }
.nav-pc .sub a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  color: #334;
}
.nav-pc .sub a:hover { background: var(--brand-soft); color: var(--brand); }
.lang-switch {
  display: inline-flex;
  align-items: center;
  margin-left: 8px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}
.lang-switch:hover { border-color: var(--brand); color: var(--brand); }
.nav-toggle {
  display: none;
  margin-left: auto;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.nav-toggle span,
.nav-toggle span:before,
.nav-toggle span:after {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--ink);
  position: relative;
}
.nav-toggle span:before,
.nav-toggle span:after {
  content: "";
  position: absolute;
  left: 0;
}
.nav-toggle span:before { top: -6px; }
.nav-toggle span:after { top: 6px; }

.nav-mask { display: none; }
.nav-drawer { display: none; }
body.nav-open { overflow: hidden; }

.hero { position: relative; overflow: hidden; background: #0b1b28; }
.hero-track { display: flex; transition: transform .5s ease; }
.hero-item { min-width: 100%; }
.hero-item img { display: block; width: 100%; height: min(520px, 56vw); object-fit: cover; }
.hero-dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 18px;
  display: flex;
  justify-content: center;
  gap: 8px;
}
.hero-dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(255,255,255,.45);
}
.hero-dots button.on { background: #fff; width: 22px; border-radius: 999px; }

.features { background: var(--bg); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 28px 0;
}
.feature-card {
  padding: 22px 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.feature-card strong { display: block; color: var(--brand); font-size: 16px; }
.feature-card span { color: var(--muted); font-size: 13px; }

.section { padding: 56px 0; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.section-head h2 { margin: 0; font-size: 28px; }
.section-head p { margin: 6px 0 0; color: var(--muted); }
.more-link { color: var(--brand); font-weight: 600; }
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.product-card {
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .2s ease, box-shadow .2s ease;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.product-card .pic {
  display: block;
  aspect-ratio: 4 / 3;
  background: #f3f6f8;
}
.product-card .pic img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.product-card h3 {
  margin: 0;
  padding: 14px 16px 16px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.45;
}

.links-bar {
  padding: 18px 0 40px;
  color: var(--muted);
}
.links-bar ul { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.links-bar a:hover { color: var(--brand); }

.page-banner img { display: block; width: 100%; height: 220px; object-fit: cover; }
.page-shell { display: grid; grid-template-columns: 250px 1fr; gap: 28px; padding: 28px 0 56px; }
.side-box {
  margin-bottom: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.side-box h3 {
  margin: 0;
  padding: 14px 16px;
  background: var(--brand);
  color: #fff;
  font-size: 16px;
}
.side-box a {
  display: block;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}
.side-box a:hover,
.side-box a.current { background: var(--brand-soft); color: var(--brand); }
.page-main { min-width: 0; }
.crumb { margin: 0 0 14px; color: var(--muted); font-size: 13px; }
.page-title { margin: 0 0 20px; font-size: 26px; }

.rich-content,
.article-body,
.pro-intro { color: #2a3540; font-size: 16px; line-height: 1.9; }
.rich-content img,
.article-body img,
.pro-intro img { display: block; max-width: 100%; margin: 16px auto; }
.pro-intro p,
.pro-intro li,
.pro-intro td,
.pro-intro th,
.pro-intro span,
.pro-intro strong,
.pro-intro a {
  background: transparent !important;
  background-color: transparent !important;
  font-family: inherit !important;
  font-size: inherit !important;
  color: inherit !important;
  white-space: normal !important;
  box-shadow: none !important;
}
.pro-intro > p:first-child {
  margin: 0 0 24px;
  padding: 16px 18px;
  background: var(--brand-soft) !important;
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
}
.pro-intro h2,
.pro-intro h3,
.pro-intro h4 {
  margin: 1.55em 0 0.7em;
  padding: 0 0 8px;
  border-bottom: 1px solid #e8eef3;
  color: var(--brand) !important;
  font-size: 18px !important;
  font-weight: 600;
  line-height: 1.4;
}
.pro-intro table,
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
}
.pro-intro th, .pro-intro td,
.article-body th, .article-body td {
  border: 1px solid #d7e2ea;
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.pro-intro th {
  min-width: 18%;
  background: var(--brand-soft) !important;
  color: var(--brand) !important;
  font-weight: 600;
}
.article-body h2, .article-body h3 { color: var(--brand); }
.article-body ul, .pro-intro ul, .pro-intro ol {
  margin: 0 0 1.1em;
  padding-left: 1.4em;
}
.article-body ul, .pro-intro ul { list-style: disc; }
.pro-intro ol { list-style: decimal; }
.article-body li, .pro-intro li { list-style: inherit; margin: .4em 0; }
.pro-intro a { color: var(--brand) !important; }
.article-lead {
  margin: 0 0 24px;
  padding: 16px 18px;
  background: var(--brand-soft);
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
}

.product-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 28px;
}
.gallery-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  padding: 16px;
  background: #f7fafc;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.gallery-main img { max-height: 360px; object-fit: contain; }
.gallery-thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.gallery-thumbs button {
  width: 72px;
  height: 72px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.gallery-thumbs button.on { border-color: var(--brand); }
.gallery-thumbs img { width: 100%; height: 100%; object-fit: contain; }
.product-meta h1 { margin: 0 0 12px; font-size: 28px; }
.product-meta p { color: var(--muted); }
.product-meta a { color: var(--brand); }

.article-head { text-align: center; margin-bottom: 24px; }
.article-head h1 { margin: 0 0 10px; font-size: 28px; }
.article-info { display: flex; justify-content: center; gap: 18px; color: #8a8a8a; font-size: 13px; }

.article-list { display: grid; gap: 16px; }
.article-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 18px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}
.article-item img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border-radius: 8px;
  background: #f3f6f8;
}
.article-item h3 { margin: 0 0 8px; font-size: 18px; }
.article-item p { margin: 0; color: var(--muted); }

.download-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.download-list a.btn {
  flex: 0 0 auto;
  padding: 6px 14px;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
}

.pager { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.pager a, .pager span {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.pager a:hover,
.pager .page-num-current,
.pager .current { background: var(--brand); border-color: var(--brand); color: #fff; }

.msg-form { max-width: 640px; }
.msg-form p { color: var(--muted); }
.contact2_li { margin: 0 0 12px; }
.contact2_li input,
.contact2_li textarea,
.faqline input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.contact2_li textarea { min-height: 140px; resize: vertical; }
.faqline { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.faqline input { width: 160px; }
.yanzheng img { height: 40px; width: auto; }
.tijiao {
  padding: 10px 28px;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  cursor: pointer;
}
.tijiao:hover { background: var(--brand-dark); }

.pre-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.pre-next > div { flex: 1 1 240px; }
.pre-next a { color: var(--brand); }

.site-footer { background: #0e2433; color: #d5e0e8; }
.footer-contact {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 28px;
  padding: 36px 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.qrcode {
  width: 120px;
  text-align: center;
}
.qrcode img {
  display: block;
  width: 100%;
  background: #fff;
  padding: 8px;
  border-radius: 10px;
}
.qrcode-tip { display: block; margin-top: 8px; font-size: 12px; color: #9db0bd; }
.footer-contact ul { color: #c5d3dc; }
.footer-nav {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
  padding: 28px 0;
}
.footer-nav dt { margin-bottom: 10px; color: #fff; font-weight: 700; }
.footer-nav dd { margin: 0 0 6px; }
.footer-nav a:hover { color: #fff; }
.footer-info {
  padding: 16px 0 28px;
  color: #8ea0ac;
  font-size: 13px;
}
.footer-info a { color: #b7c6d0; }

.float-contact, .gotop, .qr-modal { display: none; }
.float-contact {
  display: block;
  position: fixed;
  right: 18px;
  bottom: 96px;
  z-index: 30;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.contact-panel {
  display: none;
  position: fixed;
  right: 18px;
  bottom: 156px;
  z-index: 31;
  width: 240px;
  padding: 16px;
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.contact-panel.on { display: block; }
.contact-panel img { width: 100%; background: #fff; padding: 8px; border-radius: 8px; }
.gotop {
  display: none;
  position: fixed;
  right: 18px;
  bottom: 40px;
  z-index: 30;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
}
.gotop.on { display: block; }
.mobile-bar {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 35;
  background: #fff;
  border-top: 1px solid var(--line);
}
.mobile-bar a {
  flex: 1;
  padding: 10px 0;
  text-align: center;
  font-size: 12px;
}
.qr-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.45);
}
.qr-modal.on { display: flex; }
.qr-modal .box {
  padding: 28px;
  background: #fff;
  border-radius: 12px;
  text-align: center;
}

@media (max-width: 1024px) {
  .product-grid, .feature-grid, .footer-nav { grid-template-columns: repeat(2, 1fr); }
  .product-hero, .page-shell { grid-template-columns: 1fr; }
}
@media (max-width: 767px) {
  .nav-pc, .lang-switch { display: none; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-mask {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.35);
    opacity: 0;
    pointer-events: none;
  }
  body.nav-open .nav-mask { opacity: 1; pointer-events: auto; }
  .nav-drawer {
    display: block;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(84vw, 320px);
    padding: 24px 18px;
    background: #fff;
    transform: translateX(100%);
    transition: transform .25s ease;
    overflow: auto;
  }
  body.nav-open .nav-drawer { transform: none; }
  .nav-drawer a { display: block; padding: 10px 0; border-bottom: 1px solid var(--line); }
  .nav-drawer .sub { padding-left: 12px; }
  .feature-grid, .product-grid, .footer-nav, .footer-contact, .article-item { grid-template-columns: 1fr; }
  .page-banner img { height: 140px; }
  .mobile-bar { display: flex; }
  body { padding-bottom: 58px; }
  .section-head h2, .article-head h1, .product-meta h1 { font-size: 22px; }
}