:root {
  --dark: #0b3c44;
  --dark-2: #07282e;
  --teal: #0e7c86;
  --teal-light: #3abfb0;
  --teal-pale: #e8f5f5;
  --ink: #1c2b30;
  --muted: #5d6f74;
  --bg: #ffffff;
  --bg-alt: #f7fafa;
  --radius: 14px;
  --maxw: 1120px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  line-height: 1.8;
  letter-spacing: 0.02em;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5, h6 { font-weight: 700; letter-spacing: 0.03em; line-height: 1.25; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

a { color: inherit; text-decoration: none; }

/* 按钮 */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.04em;
  cursor: pointer;
  border: 0;
  transition: transform .15s, box-shadow .2s, background .2s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--teal);
  color: #fff;
  box-shadow: 0 8px 20px rgba(14,124,134,.25);
}
.btn-primary:hover { background: #0a636b; }

/* 头部导航 */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #eef2f3;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand { display: flex; align-items: center; margin-left: -8px; }
.logo-img { height: 54px; width: auto; display: block; }
.logo-img-light { background: #fff; padding: 8px 12px; border-radius: 10px; height: 54px; }
.nav-links { display: flex; gap: 32px; margin-left: auto; margin-right: 24px; }
.nav-links a { color: var(--ink); font-size: 15px; letter-spacing: 0.02em; transition: color .2s; }
.nav-links a:hover { color: var(--teal); }
.nav-cta {
  background: var(--teal);
  color: #fff;
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.nav-cta:hover { background: #0a636b; }
.nav-toggle { display: none; background: none; border: 0; font-size: 22px; cursor: pointer; color: var(--ink); }

/* 导航下拉菜单 */
.nav-item { position: relative; }
.nav-item > a { display: inline-flex; align-items: center; }
.nav-item > a::after {
  content: "▾";
  margin-left: 6px;
  font-size: 12px;
  opacity: 0.6;
  transition: transform .2s;
}
.nav-item:hover > a::after,
.nav-item.open > a::after { transform: rotate(180deg); }
.dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 210px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 16px 40px rgba(28,43,48,.12);
  border: 1px solid #eef2f3;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s, transform .2s, visibility .2s;
  z-index: 60;
}
.dropdown::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 12px; height: 12px;
  background: #fff;
  border-left: 1px solid #eef2f3;
  border-top: 1px solid #eef2f3;
}
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown,
.nav-item.open .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown a {
  display: block;
  padding: 11px 22px;
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
  border-bottom: 1px solid #f6f8f9;
  transition: background .15s, color .15s;
}
.dropdown a:last-child { border-bottom: 0; }
.dropdown a:hover { background: var(--bg-alt); color: var(--teal); }
.dropdown a .sub { display: block; font-size: 12px; color: var(--muted); font-weight: 400; }

/* 首屏轮播 */
.hero {
  position: relative;
  background: #0a1f2e;
  overflow: hidden;
}
.hero-carousel {
  position: relative;
  height: calc(100vh - 68px);
  min-height: 520px;
}
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity .9s ease;
}
.hero-slide.active {
  opacity: 1;
  visibility: visible;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 50%;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: transparent;
}
.hero-content {
  position: absolute;
  top: 0; left: 0;
  z-index: 2;
  height: auto;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  padding: 26px 30px 30px;
  color: #fff;
  max-width: 720px;
  background: transparent;
}
.hero-content h1 {
  font-size: 56px;
  line-height: 1.12;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 24px;
  max-width: 680px;
  white-space: nowrap;
  text-shadow: 0 2px 14px rgba(0,0,0,.55), 0 4px 24px rgba(0,0,0,.35);
}
.hero-content p {
  font-size: 19px;
  opacity: 1;
  max-width: none;
  white-space: nowrap;
  margin-bottom: 38px;
  text-shadow: 0 1px 10px rgba(0,0,0,.5), 0 2px 16px rgba(0,0,0,.3);
}
.hero-dots {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  z-index: 5;
}
.hero-dot {
  width: 12px;
  height: 12px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(255,255,255,.5);
  cursor: pointer;
  transition: background .25s, width .25s;
}
.hero-dot.active { background: #fff; width: 30px; }

/* 首屏品牌页单独优化（仅第一页） */
.hero-slide-brand .hero-overlay {
  background: linear-gradient(to right,
    rgba(0,0,0,.62) 0%,
    rgba(0,0,0,.50) 20%,
    rgba(0,0,0,.30) 42%,
    rgba(0,0,0,.12) 62%,
    transparent 78%);
}
.hero-slide-brand .hero-content {
  padding: 72px 48px 48px;
  max-width: 800px;
}
.hero-slide-brand .hero-content h1 {
  font-size: 84px;
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin-bottom: 32px;
  text-shadow: 0 2px 18px rgba(0,0,0,.5), 0 4px 30px rgba(0,0,0,.3);
}
.hero-slide-brand .hero-content p {
  font-size: 19px;
  font-weight: 400;
  line-height: 1.5;
  color: #eef3f4;
  opacity: 1;
  max-width: 520px;
  white-space: normal;
  margin-bottom: 48px;
  text-shadow: 0 1px 10px rgba(0,0,0,.45);
}
.hero-slide-brand .btn-primary {
  background: #1565c0;
  padding: 16px 36px;
  border-radius: 12px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 10px 26px rgba(21,101,192,.32);
}
.hero-slide-brand .btn-primary:hover { background: #0d47a1; }

/* 首屏浅色产品页单独优化（第二页） */
.hero-slide-light { background: #fff; }
.hero-slide-light .hero-content {
  padding: 72px 52px 48px;
  max-width: 560px;
  color: var(--ink);
}
.hero-slide-light .hero-content h1 {
  font-size: 58px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
  white-space: normal;
  margin-bottom: 36px;
  text-shadow: none;
}
.hero-slide-light .hero-content p {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.5;
  color: rgba(28,43,48,.92);
  max-width: 480px;
  white-space: normal;
  margin-bottom: 30px;
  text-shadow: none;
}
.hero-slide-light .btn-primary {
  background: #1565c0;
  padding: 16px 30px;
  border-radius: 16px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 10px 26px rgba(21,101,192,.25);
}
.hero-slide-light .btn-primary:hover { background: #0d47a1; }

.hero-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: rgba(220,225,228,.82);
  color: #4a5559;
  font-size: 30px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s;
}
.hero-arrow:hover { background: rgba(200,208,213,.92); }
.hero-prev { left: 22px; }
.hero-next { right: 22px; }

/* 通用区块 */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-tag {
  color: var(--teal);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
}
.section-tag.center { text-align: center; }
.section-tag.light { color: rgba(255,255,255,.85); }
.section-title {
  font-size: 34px;
  color: var(--dark);
  text-align: center;
  margin-bottom: 42px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.section-title.left { text-align: left; }
.section-title.light { color: #fff; }
.section-sub {
  max-width: 720px;
  margin: -22px auto 0;
  text-align: center;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}
.section-sub.center { text-align: center; }

/* 关于我们 */
.about { display: grid; grid-template-columns: 1fr; gap: 40px; }
.about-text { max-width: 860px; }
.about-text p { color: var(--muted); margin-bottom: 14px; }
.about-text h2 { margin-bottom: 20px; }
.about-lead {
  font-size: 18px;
  font-weight: 400;
  color: var(--muted);
  margin-bottom: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--teal-light);
  line-height: 1.6;
  letter-spacing: 0.04em;
}
.text-link { color: var(--teal); font-weight: 700; }
.text-link:hover { text-decoration: underline; }
.about-image {
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-image img {
  width: 100%; max-width: 640px; height: auto;
  border-radius: var(--radius);
  box-shadow: 0 20px 50px rgba(11,60,68,.15);
}

/* 产品中心 */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 4px 16px rgba(0,0,0,.04);
  transition: transform .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(14,124,134,.12); }
.product-card.hide { display: none; }
.product-img {
  position: relative;
  width: 100%; aspect-ratio: 16/9;
  border-radius: 10px;
  margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
  background: #eef5f6;
}
.product-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.product-card:hover .product-img img { transform: scale(1.04); }
.product-card h3 { font-size: 20px; color: var(--dark); margin-bottom: 10px; }
.product-card p { color: var(--muted); font-size: 14px; }
.product-card .product-cta { margin-top: 16px; width: 100%; text-align: center; font-size: 14px; padding: 11px 20px; box-shadow: none; }

/* 产品中心：需求筛选条 */
.product-filter {
  display: flex; justify-content: center; flex-wrap: wrap; gap: 10px;
  margin-bottom: 36px;
}
.filter-btn {
  padding: 9px 22px;
  border: 1px solid #d9e5e6;
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
}
.filter-btn:hover { border-color: var(--teal-light); color: var(--teal); }
.filter-btn.active {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}

/* 产品中心：参数化卡片 */
.product-card .product-desc { margin-bottom: 16px; }
.product-model {
  position: absolute; top: 10px; right: 10px;
  background: rgba(255,255,255,.94);
  color: var(--teal);
  font-size: 12px; font-weight: 600;
  padding: 4px 10px; border-radius: 999px;
  letter-spacing: .02em;
}
.spec-list { margin: 0 0 16px; border-top: 1px solid #eef2f3; }
.spec-row {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 12px; padding: 8px 0;
  border-bottom: 1px solid #f2f5f6;
}
.spec-row dt { font-size: 13px; color: var(--muted); }
.spec-row dd { margin: 0; font-size: 14px; color: var(--ink); font-weight: 500; text-align: right; }
.product-card .reg-bar {
  background: var(--teal-pale);
  color: #0a636b;
  font-size: 12px;
  padding: 9px 12px;
  border-radius: 8px;
  margin-bottom: 16px;
}
.product-actions { display: flex; gap: 10px; margin-top: auto; }
.product-actions .btn { flex: 1; text-align: center; font-size: 14px; padding: 11px 16px; }
.btn-ghost {
  background: #fff;
  color: var(--teal);
  border: 1px solid #cfe3e4;
  box-shadow: none;
}
.btn-ghost:hover { background: var(--teal-pale); border-color: var(--teal-light); }
.compliance-note {
  margin-top: 32px;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

/* 系列总览卡片 */
.series-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 36px; }
.series-card {
  background: #fff;
  border: 1px solid #e6efef;
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s, transform .15s;
}
.series-card:hover { box-shadow: 0 16px 40px rgba(14,124,134,.12); transform: translateY(-4px); }
.series-card-img { width: 100%; aspect-ratio: 4/3; background: #fff; overflow: hidden; display: flex; align-items: center; justify-content: center; padding: 16px; }
.series-card-img img { width: 100%; height: 100%; object-fit: contain; display: block; }
.series-card-link { text-decoration: none; color: inherit; display: block; }
.series-card-link:hover .series-card { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(14,124,134,.12); }

/* 系列详情页：型号卡片 */
.model-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; margin-top: 36px; }
.model-card { background: #fff; border-radius: var(--radius); padding: 26px 24px; box-shadow: 0 4px 16px rgba(0,0,0,.04); border: 1px solid #eef2f3; }
.model-card h3 { font-size: 22px; color: var(--dark); margin-bottom: 18px; }
.model-card .spec-list { margin: 0; }
.model-card .spec-row { padding: 9px 0; }
.model-card .spec-row dt { color: var(--muted); font-size: 13px; }
.model-card .spec-row dd { font-size: 15px; color: var(--ink); font-weight: 500; }

/* 系列详情页主图：完整展示，不裁切 */
.series-detail .pdp-main-img { background: #fff; display: flex; align-items: center; justify-content: center; padding: 18px; }
.series-detail .pdp-main-img img { object-fit: contain; }
.series-card-body { padding: 20px 22px 24px; }
.series-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--teal);
  background: var(--teal-pale);
  border-radius: 999px;
  padding: 5px 12px;
  margin-bottom: 12px;
}
.series-spec { font-size: 14px; color: var(--muted); line-height: 1.7; margin-bottom: 12px; }
.series-models { font-size: 14px; font-weight: 600; color: var(--ink); letter-spacing: .01em; }
.series-note { margin-top: 22px; font-size: 13px; color: var(--muted); text-align: center; }

/* 全型号参数对比表 */
.model-table-wrap {
  margin-top: 32px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid #e6efef;
  border-radius: var(--radius);
  background: #fff;
}
.model-table { width: 100%; border-collapse: collapse; min-width: 920px; font-size: 14px; }
.model-table thead th {
  position: sticky; top: 0;
  background: var(--dark, #143a50);
  color: #fff;
  font-weight: 600;
  padding: 14px 14px;
  text-align: center;
  white-space: nowrap;
  border-bottom: 2px solid #0c2a3a;
}
.model-table tbody td {
  padding: 12px 14px;
  text-align: center;
  color: var(--ink);
  border-bottom: 1px solid #eef2f3;
  white-space: nowrap;
}
.model-table tbody tr:nth-child(even) { background: #f6fafa; }
.model-table tbody tr:hover { background: var(--teal-pale); }
.model-table td:first-child, .model-table th:first-child { font-weight: 700; color: var(--teal); }

/* 知识库 */
.kb-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.kb-item {
  position: relative;
  background: #fff;
  border: 1px solid #e6efef;
  border-radius: var(--radius);
  padding: 32px 26px;
  overflow: hidden;
  transition: box-shadow .2s, transform .15s, border-color .2s;
}
.kb-item::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--teal);
  opacity: .85;
}
.kb-item:hover {
  box-shadow: 0 14px 34px rgba(14,124,134,.10);
  transform: translateY(-4px);
  border-color: #d2e5e7;
}
.kb-item h4 {
  color: var(--dark);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
  line-height: 1.35;
}
.kb-item p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}
.kb-note { text-align: center; color: var(--muted); font-size: 13px; margin-top: 32px; }

/* 数据指标 */
.stats { background: var(--dark); color: #fff; padding: 60px 0; }
.stats-inner { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat-num { display: block; font-size: 30px; font-weight: 700; margin-bottom: 6px; letter-spacing: 0.04em; }
.stat-label { font-size: 14px; opacity: .8; font-weight: 400; }
.stats-note { text-align: center; color: rgba(255,255,255,.72); font-size: 13px; line-height: 1.75; max-width: 760px; margin: 24px auto 0; }

/* 服务保障 */
.service-promise {
  background: linear-gradient(135deg, #0a1f2e 0%, #1a4a5e 100%);
  color: #fff;
  padding: 90px 0;
}
.service-promise .section-subtitle {
  text-align: center;
  font-size: 17px;
  color: rgba(255,255,255,.85);
  margin-top: -28px;
  margin-bottom: 52px;
}
.promise-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.promise-card {
  background: #fff;
  color: var(--ink);
  border-radius: var(--radius);
  padding: 38px 28px;
  text-align: center;
  box-shadow: 0 14px 34px rgba(0,0,0,.14);
}
.promise-icon {
  width: 56px; height: 56px; margin: 0 auto 18px;
  background: var(--teal);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.promise-icon svg { display: block; }
.promise-card h4 { font-size: 19px; margin-bottom: 12px; color: var(--dark); font-weight: 700; }
.promise-card p { font-size: 14px; color: var(--muted); line-height: 1.7; }

/* FAQ */
.faq-section { background: var(--bg); }
.faq { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid #e6efef;
  padding: 18px 0;
}
.faq-item summary {
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  cursor: pointer;
  list-style: none;
  display: flex; justify-content: space-between; align-items: center;
}
.faq-item summary::after { content: "+"; font-size: 22px; color: var(--teal); }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { color: var(--muted); padding-top: 12px; font-size: 14px; }

/* 联系我们 */
.contact-section { background: var(--bg-alt); }
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.contact-text p { color: var(--muted); margin-bottom: 18px; }
.contact-body { display: flex; align-items: flex-start; gap: 24px; }
.contact-list { list-style: none; flex: 1 1 auto; min-width: 0; }
.contact-list li { padding: 7px 0; color: var(--ink); font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.contact-list a { color: var(--teal); text-decoration: none; }
.contact-list a:hover { text-decoration: underline; }
.contact-qr { flex: 0 0 90px; width: 90px; height: 90px; background: #eef5f6; border-radius: 10px; overflow: hidden; display: flex; align-items: center; justify-content: center; box-shadow: 0 2px 8px rgba(0,0,0,.04); }
.contact-qr img { width: 100%; height: 100%; object-fit: cover; }
.contact-form { display: flex; flex-direction: column; gap: 14px; background: #fff; padding: 28px; border-radius: var(--radius); box-shadow: 0 4px 16px rgba(0,0,0,.04); }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 12px 14px; border: 1px solid #dde6e8; border-radius: 10px;
  font-size: 15px; font-family: inherit; background: #fff; resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--teal); }
.form-tip { font-size: 12px; color: var(--muted); margin: 0; }
.form-tip.form-err { color: #c0392b; }
.form-tip.form-ok { color: var(--teal); font-weight: 600; }

/* 页脚 */
.site-footer { background: var(--dark-2); color: #a8c5c9; padding: 50px 0 24px; }
.footer-main {
  display: grid; grid-template-columns: .9fr 1.1fr;
  gap: 60px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 24px;
}
.footer-brand p { margin-top: 12px; font-size: 14px; opacity: .8; }
.footer-columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.footer-col h5 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col a, .footer-col span { display: block; color: #a8c5c9; font-size: 14px; margin-bottom: 8px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.footer-bottom > p { font-size: 13px; display: flex; align-items: center; }
.beian { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.beian a { color: #a8c5c9; display: inline-flex; align-items: center; vertical-align: middle; }
.beian a:hover { color: #fff; text-decoration: underline; }
.beian-ps { display: inline-flex; align-items: center; gap: 6px; }
.beian-ps img { height: 18px; width: auto; display: block; }

/* 响应式 */
@media (max-width: 1100px) {
  .cards, .kb-grid, .promise-grid { grid-template-columns: repeat(2, 1fr); }
  .series-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-content h1 { font-size: 46px; }
}
@media (max-width: 900px) {
  .hero-carousel { height: 78vh; min-height: 440px; }
  .hero-content { padding: 22px 24px 24px; max-width: 80%; }
  .hero-content h1 { font-size: 38px; }
  .hero-content p { font-size: 17px; white-space: normal; }
  .hero-slide-brand .hero-content { padding: 56px 32px 32px; }
  .hero-slide-brand .hero-content h1 { font-size: 58px; margin-bottom: 28px; letter-spacing: -0.01em; }
  .hero-slide-brand .hero-content p { font-size: 17px; margin-bottom: 40px; }
  .hero-slide-brand .btn-primary { padding: 14px 30px; font-size: 16px; border-radius: 11px; }
  .hero-slide-light .hero-content { padding: 56px 36px 36px; max-width: 80%; }
  .hero-slide-light .hero-content h1 { font-size: 44px; margin-bottom: 28px; }
  .hero-slide-light .hero-content p { font-size: 18px; margin-bottom: 26px; }
  .hero-slide-light .btn-primary { padding: 14px 28px; font-size: 16px; border-radius: 14px; }
  .about, .contact { grid-template-columns: 1fr; }
  .contact-body { flex-direction: column; align-items: flex-start; gap: 18px; }
  .contact-list li { white-space: normal; }
  .cards, .kb-grid, .promise-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr; gap: 30px; }
  .footer-columns { grid-template-columns: repeat(2, 1fr); }
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: #fff; border-bottom: 1px solid #eef2f3;
    max-height: 0; overflow: hidden; transition: max-height .25s;
    margin-left: 0; margin-right: 0;
  }
  .nav-links.open { max-height: 520px; }
  .nav-links > a,
  .nav-links > .nav-item > a { padding: 14px 24px; border-top: 1px solid #f2f5f6; display: flex; justify-content: space-between; }
  .nav-links > .nav-item > a::after { margin-left: auto; }
  .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .nav-links .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    max-height: 0;
    overflow: hidden;
    box-shadow: none;
    border: 0;
    border-radius: 0;
    padding: 0;
    background: #f7fafa;
    transition: max-height .25s ease;
  }
  .nav-links .dropdown::before { display: none; }
  .nav-links .nav-item.open .dropdown { max-height: 220px; }
  .nav-links .dropdown a {
    padding: 12px 40px;
    border-bottom: 1px solid #eef2f3;
    color: var(--ink);
    font-size: 14px;
  }
  .nav-links .dropdown a:hover { background: #eef5f5; }
}
@media (max-width: 520px) {
  .hero-content { padding: 16px 18px 18px; max-width: 100%; }
  .hero-content h1 { font-size: 26px; white-space: normal; }
  .hero-content p { font-size: 15px; white-space: normal; margin-bottom: 26px; }
  .hero-slide-brand .hero-content { padding: 44px 22px 22px; }
  .hero-slide-brand .hero-content h1 { font-size: 36px; margin-bottom: 20px; }
  .hero-slide-brand .hero-content p { font-size: 15px; margin-bottom: 30px; }
  .hero-slide-light .hero-content { padding: 44px 24px 24px; }
  .hero-slide-light .hero-content h1 { font-size: 34px; margin-bottom: 22px; }
  .hero-slide-light .hero-content p { font-size: 16px; margin-bottom: 22px; }
  .hero-slide-light .btn-primary { padding: 12px 24px; font-size: 15px; border-radius: 12px; }
  .hero-arrow { width: 38px; height: 38px; font-size: 24px; }
  .hero-prev { left: 10px; }
  .hero-next { right: 10px; }
  .stats-inner, .footer-columns { grid-template-columns: 1fr; }
  .series-grid { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}

/* 资质与实力 */
.creds { background: var(--bg); }
.creds-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cred-card {
  background: #fff; border: 1px solid #e6efef; border-radius: var(--radius);
  padding: 28px 24px; text-align: center;
  transition: box-shadow .2s, transform .15s, border-color .2s;
}
.cred-card:hover { box-shadow: 0 14px 34px rgba(14,124,134,.10); transform: translateY(-4px); border-color: #d2e5e7; }
.cred-icon {
  width: 48px; height: 48px; margin: 0 auto 14px; border-radius: 12px;
  background: var(--teal-pale); display: flex; align-items: center; justify-content: center;
  color: var(--teal); font-weight: 700; font-size: 18px;
}
.cred-card h4 { color: var(--dark); font-size: 17px; margin-bottom: 8px; }
.cred-card p { color: var(--muted); font-size: 13px; line-height: 1.6; }
.cred-no {
  display: inline-block; margin-top: 10px; font-size: 12px; color: var(--teal);
  background: var(--teal-pale); padding: 3px 10px; border-radius: 999px;
}
.cred-nos {
  list-style: none; margin: 12px 0 0; text-align: left;
  font-size: 12px; color: var(--teal); line-height: 1.75;
}
.cred-nos li { padding: 1px 0; }
.cred-nos b { color: var(--dark); font-weight: 600; }
.cred-nos .sub { color: var(--muted); font-size: 11px; padding-left: 4px; }

/* 产品标签 */
.product-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.product-tags span {
  font-size: 12px; color: var(--teal); background: var(--teal-pale);
  padding: 4px 10px; border-radius: 999px;
}
.product-tags .reg {
  flex-basis: 100%; text-align: center; font-weight: 600;
  color: #fff; background: var(--teal); letter-spacing: .2px;
}

/* 联系-额外入口 */
.contact-extra { list-style: none; margin-top: 6px; }
.contact-extra li { display: flex; align-items: center; gap: 8px; padding: 6px 0; color: var(--ink); font-size: 14px; }
.contact-extra .lab { color: var(--muted); min-width: 44px; }

@media (max-width: 900px) {
  .creds-grid { grid-template-columns: 1fr; }
}

/* 产品详情页 */
.pdp-crumb {
  background: var(--bg-alt);
  border-bottom: 1px solid #eef2f3;
  padding: 14px 0;
  font-size: 13px;
}
.pdp-crumb a { color: var(--muted); }
.pdp-crumb a:hover { color: var(--teal); }
.pdp-crumb .sep { margin: 0 8px; color: #b6c3c6; }
.pdp-crumb .current { color: var(--ink); }

.pdp-main {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: start;
}
.pdp-main-img {
  border-radius: var(--radius);
  overflow: hidden;
  background: #eef5f6;
  aspect-ratio: 4/3;
}
.pdp-main-img img { width: 100%; height: 100%; object-fit: cover; display: block; }

.pdp-cat {
  display: inline-block;
  background: var(--teal-pale);
  color: var(--teal);
  font-size: 13px;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.pdp-info h1 { font-size: 38px; line-height: 1.2; color: var(--dark); margin-bottom: 14px; }
.pdp-info .pdp-lead { font-size: 17px; color: var(--muted); margin-bottom: 28px; }
.pdp-spec { margin-bottom: 24px; }
.pdp-spec .spec-row { padding: 11px 0; }
.pdp-spec .spec-row dt { font-size: 14px; }
.pdp-spec .spec-row dd { font-size: 15px; }
.pdp-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.pdp-actions .btn { padding: 14px 30px; }

.pdp-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 40px;
}
.pdp-feature {
  background: #fff;
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: 0 4px 16px rgba(0,0,0,.04);
}
.pdp-feature h4 { font-size: 17px; color: var(--dark); margin-bottom: 10px; }
.pdp-feature p { font-size: 14px; color: var(--muted); line-height: 1.7; }

.pdp-list { list-style: none; margin-top: 32px; max-width: 780px; }
.pdp-list li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 14px;
  font-size: 15px;
  color: var(--ink);
  line-height: 1.7;
}
.pdp-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 10px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal-light);
}
.pdp-caution li::before { background: #d99a2b; }

@media (max-width: 900px) {
  .pdp-main { grid-template-columns: 1fr; gap: 32px; }
  .pdp-info h1 { font-size: 30px; }
  .pdp-features { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .pdp-info h1 { font-size: 26px; }
  .pdp-actions .btn { flex: 1 1 100%; text-align: center; }
}