:root {
  --brand-red: #c8102e;
  --ink: #202124;
  --charcoal: #1c1c1d;
  --gray: #666b70;
  --light-gray: #f5f5f5;
  --line: #e5e5e5;
  --header-height: 90px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

/* Why: 所有桌面端子菜单都以视口为定位基准，避免被单个一级菜单的宽度挤成竖排。 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1050;
  height: var(--header-height);
  /* Why: 全站统一使用明亮导航栏，提升品牌 Logo 和黑色菜单文字的识别度。 */
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.site-header .navbar { height: 100%; padding: 0; background: #fff; }
.nav-shell { width: 100%; max-width: 1920px; height: 100%; padding: 0 clamp(28px, 3.4vw, 68px); }
.navbar-brand { display: flex; align-items: center; width: clamp(150px, 13vw, 215px); margin: 0; }
.navbar-brand img { width: 100%; height: 62px; object-fit: contain; object-position: left center; }
.navbar-collapse { height: 100%; }
.navbar-nav { height: 100%; gap: clamp(16px, 2.8vw, 58px); }
.navbar-nav .nav-item { position: static; display: flex; height: 100%; align-items: stretch; }
.navbar-nav .nav-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: 0 4px !important;
  border: 0;
  background: transparent;
  color: var(--ink) !important;
  font-size: clamp(14px, 1vw, 18px);
  font-weight: 600;
  white-space: nowrap;
}
.navbar-nav .nav-link::after {
  content: "";
  position: absolute;
  right: 22%;
  bottom: 10px;
  left: 22%;
  height: 3px;
  background: transparent;
}
.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link:focus-visible::after,
.navbar-nav .nav-link.active::after,
.mega-trigger.is-open > .mega-toggle::after { background: var(--brand-red); }
.language-switch { flex: 0 0 auto; margin-left: clamp(18px, 2.4vw, 45px); }
.language-switch button {
  width: 56px;
  height: 56px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
}

.mega-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  z-index: 1040;
  display: none;
  width: 100vw;
  max-height: calc(100vh - var(--header-height));
  overflow-y: auto;
  border: 0;
  background: #fff;
  box-shadow: 0 18px 28px rgba(0, 0, 0, .12);
  color: var(--ink);
}
.mega-trigger:hover > .mega-menu,
.mega-trigger.is-open > .mega-menu { display: block; }
.menu-empty { margin: 0; color: var(--gray); text-align: center; }

.product-mega-layout {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(520px, 650px) minmax(240px, 1fr);
  min-height: 330px;
  padding: 42px clamp(30px, 5vw, 100px) 50px;
  gap: clamp(24px, 3vw, 60px);
  align-items: start;
}
.product-menu-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 46px;
}
.product-menu-group h2,
.solution-menu-group .menu-heading {
  display: block;
  margin: 0 0 16px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--line);
  color: #2e3235;
  font-size: 19px;
  font-weight: 600;
}
.product-menu-links,
.solution-menu-links { display: grid; align-content: start; gap: 0; }
.product-menu-link,
.solution-menu-links a {
  display: block;
  padding: 7px 0;
  color: #5b6064;
  font-size: 16px;
  line-height: 1.55;
}
.product-menu-link:hover,
.product-menu-link:focus-visible,
.solution-menu-links a:hover,
.solution-menu-links a:focus-visible,
.solution-menu-group .menu-heading:hover { color: var(--brand-red); }
.product-menu-preview {
  min-height: 230px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .12s ease, transform .12s ease;
}
.product-menu-preview.preview-left { transform: translateX(18px); }
.product-menu-preview.preview-right { transform: translateX(-18px); }
.product-menu-preview.is-visible { opacity: 1; transform: translateX(0); }
.product-preview-source { display: grid; grid-template-columns: minmax(110px, 46%) 1fr; gap: 18px; align-items: center; }
.product-preview-source img { width: 100%; height: 190px; object-fit: cover; }
.product-preview-source h3 { margin: 0 0 10px; font-size: 18px; }
.preview-copy { color: #777c80; font-size: 13px; line-height: 1.7; }
.preview-copy p { margin: 0; }

.solution-menu-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(180px, 235px));
  justify-content: center;
  gap: clamp(25px, 4vw, 65px);
  min-height: 300px;
  padding: 42px 40px 52px;
}
.simple-menu-links {
  display: grid;
  justify-content: center;
  align-items: center;
  min-height: 112px;
  padding: 22px 40px;
  gap: clamp(60px, 10vw, 180px);
}
.about-menu-links {
  grid-template-columns: repeat(5, minmax(120px, 170px));
  gap: clamp(24px, 4vw, 70px);
}
.news-menu-links { grid-template-columns: repeat(2, minmax(150px, 210px)); }
.simple-menu-links a {
  padding: 18px 8px;
  color: #34383b;
  font-size: 18px;
  text-align: center;
}
.simple-menu-links a:hover,
.simple-menu-links a:focus-visible { color: var(--brand-red); }

.eyebrow { margin-bottom: 14px; color: var(--brand-red); font-size: 12px; font-weight: 700; letter-spacing: .2em; }
.hero-carousel,
.hero-carousel .carousel-item { height: calc(100vh - var(--header-height)); min-height: 580px; }
.hero-carousel picture,
.hero-carousel picture img { display: block; width: 100%; height: 100%; object-fit: cover; }
.hero-carousel .carousel-item::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(12, 14, 16, .22), rgba(12, 14, 16, .02)); }
.hero-carousel .carousel-caption { z-index: 1; inset: 0; display: flex; align-items: flex-end; padding-bottom: 9vh; text-align: left; }
.hero-carousel h1 { max-width: 900px; margin-bottom: 20px; font-size: clamp(38px, 4.5vw, 76px); font-weight: 700; }
.hero-carousel .carousel-caption p:not(.eyebrow) { max-width: 760px; font-size: 19px; }
.hero-carousel .btn { margin-top: 18px; padding: 12px 28px; border-radius: 0; }
.hero-placeholder { background: linear-gradient(125deg, #232526, #5c6266); }
.hero-placeholder::before { content: ""; position: absolute; top: -12vw; right: -10vw; width: 48vw; height: 48vw; border: 1px solid rgba(255,255,255,.12); border-radius: 50%; }
.section-space { padding: 90px 0; }
/* Why: 分类介绍和产品列表相邻时各自的通用留白会叠加，只缩减相接的一侧以保持区块内部节奏。 */
.product-category-intro { padding-bottom: 45px; }
.product-category-list { padding-top: 45px; }
.home-intro h2,
.section-heading h2,
.category-intro h2 { font-size: clamp(32px, 3.4vw, 54px); font-weight: 650; }
.section-lead { max-width: 760px; margin: 24px auto; color: var(--gray); font-size: 18px; line-height: 1.9; }
.page-hero { display: flex; height: 360px; align-items: center; padding: 0; background: linear-gradient(120deg, #303438, #777e83); color: #fff; }
.page-hero.compact { height: 360px; padding: 0; }
.page-hero h1 { font-size: clamp(36px, 4vw, 64px); }
.category-banner { height: 360px; min-height: 0; background-position: center; background-size: cover; }
.category-copy { max-width: 1180px; margin: 0 auto; }
.category-copy > .eyebrow,
.category-copy > h2 { text-align: center; }
.content-image,
.feature-image { width: 100%; height: auto; }
.series-filter,
.solution-tabs,
.subnav { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-bottom: 60px; }
.series-filter a,
.solution-tabs a,
.subnav a { min-width: 132px; padding: 12px 22px; background: var(--light-gray); border-bottom: 2px solid transparent; text-align: center; }
.series-filter a.active,
.series-filter a:hover,
.solution-tabs a.active,
.solution-tabs a:hover,
.subnav a.active,
.subnav a:hover { border-color: var(--brand-red); background: var(--brand-red); color: #fff; }
.rich-content { color: #555b60; line-height: 1.9; }
.rich-content img { max-width: 100%; height: auto; }
.rich-content p.line-spacing-compact { line-height: 1.35; }
.rich-content p.line-spacing-normal { line-height: 1.8; }
.rich-content p.line-spacing-loose { line-height: 2.4; }

.product-section { background: #fff; }
.section-heading { margin-bottom: 48px; text-align: center; }
.product-card { display: flex; flex-direction: column; height: 100%; background: #fff; }
.product-card > img,
.product-card .image-placeholder { width: 100%; height: 300px; object-fit: cover; }
.image-placeholder { display: grid; place-items: center; background: linear-gradient(135deg, #eceeef, #c9cdd0); color: #fff; font-size: 22px; font-weight: 700; letter-spacing: .15em; }
.image-placeholder.detail { height: 500px; }
.product-card-body { display: flex; flex: 1; flex-direction: column; align-items: center; padding: 22px 0; text-align: center; }
.product-card-body small { color: #363a3d; }
.product-card h3 { margin: 5px 0 24px; font-size: 17px; font-weight: 500; line-height: 1.55; }
.product-card span { margin-top: auto; padding: 10px 22px; border-radius: 22px; background: #303133; color: #fff; font-size: 14px; }
.product-card:hover h3 { color: var(--brand-red); }
.product-card:hover span { background: var(--brand-red); }

/* Why: 主图仍保持最大单栏宽度，同时释放空间给说明文字；右栏允许客户按性能图比例自行调宽。 */
.product-detail-grid { display: flex; gap: 24px; align-items: stretch; height: min(720px, calc(100vh - 180px)); min-height: 560px; padding: 32px; background: #f1f1f1; }
.product-detail-grid .product-gallery-column { flex: 0 0 34%; }
.product-detail-grid .product-detail-content { flex: 1 1 auto; }
.product-detail-grid .product-feature-column { flex: 0 0 32%; width: 32%; min-width: 260px; }
.product-detail-grid.two-column .product-gallery-column { flex-basis: 45%; }
/* 允许固定高度网格的子项纵向收缩，避免图片固有尺寸将栏目撑出页面。 */
.product-detail-grid > div,
.product-detail-grid > article,
.product-detail-grid > aside { min-width: 0; min-height: 0; background: #fff; }
.product-detail-grid > article { overflow-y: auto; padding: 38px; }
/* Why: 内容滚动能力必须始终保留，但静止时弱化滚动条可减少详情栏的视觉干扰。 */
.product-detail-content { scrollbar-color: rgba(89, 94, 98, .08) transparent; scrollbar-width: thin; }
.product-detail-content:hover { scrollbar-color: rgba(89, 94, 98, .72) transparent; }
.product-detail-content::-webkit-scrollbar { width: 9px; }
.product-detail-content::-webkit-scrollbar-track { background: transparent; }
.product-detail-content::-webkit-scrollbar-thumb { border: 2px solid transparent; border-radius: 999px; background: rgba(89, 94, 98, .08); background-clip: padding-box; }
.product-detail-content:hover::-webkit-scrollbar-thumb,
.product-detail-content::-webkit-scrollbar-thumb:hover { background: rgba(89, 94, 98, .72); background-clip: padding-box; }
.product-gallery-column,
.product-feature-column { overflow: hidden; }
.product-gallery,
.product-gallery .carousel-inner,
.product-gallery .carousel-item,
.product-feature-gallery,
.product-feature-gallery .carousel-inner,
.product-feature-gallery .carousel-item { height: 100%; }
.product-gallery img { display: block; width: 100%; height: 100%; object-fit: contain; object-position: center; }
.image-placeholder.detail { width: 100%; height: 100%; }
.product-gallery-controls { position: absolute; z-index: 2; bottom: 18px; left: 50%; display: flex; gap: 8px; transform: translateX(-50%); }
.product-gallery .carousel-control-prev,
.product-gallery .carousel-control-next,
.product-feature-gallery .carousel-control-prev,
.product-feature-gallery .carousel-control-next { position: static; width: 36px; height: 36px; border-radius: 50%; background: #2f3133; opacity: .92; }
.product-gallery .carousel-control-prev-icon,
.product-gallery .carousel-control-next-icon,
.product-feature-gallery .carousel-control-prev-icon,
.product-feature-gallery .carousel-control-next-icon { width: 16px; height: 16px; background-size: 16px 16px; }
.feature-preview-button { display: block; height: 100%; }
.feature-image { display: block; width: 100%; height: 100%; object-fit: contain; object-position: center; }

.category-matrix-wrap { padding: 48px 0; background: #f3f3f3; }
.category-matrix { display: grid; max-width: 1060px; margin: 0 auto; gap: 16px; }
.category-matrix-row { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 34px; align-items: center; }
.category-matrix-label {
  position: relative;
  padding: 14px 20px;
  border-radius: 6px;
  background: #fff;
  color: #202428;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
}
.category-matrix-label::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -8px;
  border-width: 8px 0 8px 8px;
  border-style: solid;
  border-color: transparent transparent transparent #fff;
  transform: translateY(-50%);
}
.category-matrix-label.active { background: #df1f26; color: #fff; }
.category-matrix-label.active::after { border-left-color: #df1f26; }
.category-matrix-links { display: flex; flex-wrap: wrap; align-items: center; row-gap: 10px; }
.category-matrix-links a {
  position: relative;
  padding: 3px 22px;
  color: #23272b;
  font-size: 17px;
  line-height: 1.5;
  white-space: nowrap;
}
.category-matrix-links a:first-child { padding-left: 0; }
.category-matrix-links a + a::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 0;
  width: 1px;
  background: #cfd0d1;
}
.category-matrix-links a:hover,
.category-matrix-links a.active { color: #df1f26; font-weight: 700; }
.product-hierarchy-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(150px, 1fr));
  gap: 12px;
}
.product-hierarchy-item {
  min-width: 0;
  padding: 15px 18px;
  border: 1px solid #dedfe0;
  border-radius: 5px;
  background: rgba(255, 255, 255, .7);
}
.product-hierarchy-item.has-children {
  grid-column: span 2;
  border-left: 3px solid #df1f26;
  background: #fff;
}
.product-hierarchy-title {
  display: block;
  color: #25292d;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
}
.product-hierarchy-title:hover { color: #df1f26; }
.product-series-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  padding-top: 11px;
  border-top: 1px solid #ececec;
}
.product-series-links a {
  padding: 5px 11px;
  border-radius: 3px;
  background: #f1f2f3;
  color: #676b6f;
  font-size: 13px;
}
.product-series-links a:hover { background: #df1f26; color: #fff; }
.solution-main { min-width: 0; }
.solution-category-page > .container-xl.section-space { padding-top: 48px; padding-bottom: 56px; }
.solution-preview { max-width: 1180px; margin: 0 auto; }
.solution-preview h2 { margin-bottom: 24px; font-size: clamp(30px, 3vw, 48px); }
.solution-images { display: grid; gap: 22px; margin-top: 24px; }
/* Why: 客户提供的方案图常把说明组合在一张横图中，跟随正文宽度才能保证细节可读。 */
.solution-image { width: 100%; margin: 0 auto; text-align: center; }
.solution-image img { display: block; width: 100%; height: auto; max-height: 620px; margin: 0 auto; object-fit: contain; }
.solution-products { margin-top: 42px; padding-top: 38px; border-top: 1px solid var(--line); }
.solution-products .section-heading { margin-bottom: 32px; }
.article-content,
.article-narrow { max-width: 900px; margin: 0 auto; }
.news-card { display: block; height: 100%; background: #fff; box-shadow: 0 8px 26px rgba(30,35,38,.08); transition: transform .2s ease; }
.news-card:hover { transform: translateY(-5px); }
.news-card img,
.news-placeholder { width: 100%; height: 290px; object-fit: cover; }
.news-card > div { padding: 25px; text-align: center; }
.news-card time,
.news-detail time { color: #777c80; font-size: 15px; }
.news-card h2 { margin: 0 0 10px; font-size: 17px; font-weight: 700; line-height: 1.5; }
.news-card p { color: var(--gray); }
.news-detail .article-narrow { max-width: 1100px; }
.news-detail h1 { margin: 16px 0 48px; font-size: clamp(32px, 4vw, 56px); }
.news-video { width: min(100%, 960px); margin: 0 auto 42px; background: #111; }
.news-video video { display: block; width: 100%; max-height: 70vh; aspect-ratio: 16 / 9; object-fit: contain; }
/* 旧站正文带固定像素尺寸，强制媒体自适应可保留排版同时避免移动端溢出。 */
.news-detail .rich-content img { max-width: 100% !important; height: auto !important; }
.news-detail .rich-content iframe { display: block; width: 100% !important; max-width: 960px; height: auto !important; margin: 30px auto; aspect-ratio: 16 / 9; border: 0; }
.pagination-wrap { margin-top: 48px; }
/* Why: 新闻分页沿用品牌红色，同时限定在新闻列表内，避免覆盖其他业务页面的分页样式。 */
.news-list-section .pagination { gap: 8px; }
.news-list-section .page-link {
  min-width: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 3px !important;
  background: #fff;
  color: var(--ink);
  text-align: center;
  box-shadow: none;
}
.news-list-section .page-link:hover,
.news-list-section .page-link:focus-visible {
  border-color: var(--brand-red);
  background: #fff;
  color: var(--brand-red);
}
.news-list-section .page-item.active .page-link {
  border-color: var(--brand-red);
  background: var(--brand-red);
  color: #fff;
}
.news-list-section .page-item.disabled .page-link {
  border-color: var(--line);
  background: #f5f5f5;
  color: #aaa;
}
.contact-list { display: grid; grid-template-columns: 80px 1fr; gap: 16px; margin: 32px 0; }
.contact-list dt { color: var(--gray); }
.contact-map { width: 100%; height: 440px; border: 0; }
.site-footer { padding: 48px 0; background: #222629; color: #aeb3b7; }
.site-footer .container-xl { display: flex; align-items: flex-end; justify-content: space-between; }
.site-footer strong { color: #fff; }
.site-footer p { margin: 8px 0 0; }
.empty-state,
.empty-page { padding: 80px 16px; color: var(--gray); text-align: center; }
.empty-page h1 { color: var(--brand-red); font-size: 96px; }

.inner-banner { height: 360px; background-position: center; background-size: cover; color: #fff; }
.inner-banner-overlay { display: flex; align-items: center; height: 100%; background: linear-gradient(90deg, rgba(18,20,21,.68), rgba(18,20,21,.08)); }
.inner-banner p { margin: 0 0 10px; color: #fff; font-size: 13px; font-weight: 700; letter-spacing: .22em; }
.inner-banner h1 { margin: 0; font-size: clamp(38px, 4vw, 64px); }
/* Why: 详情页信息密度更高，单独减半 Banner 高度，不影响栏目首页的统一视觉高度。 */
.detail-banner,
.page-hero.detail-banner,
.page-hero.compact.detail-banner { height: 180px; min-height: 0; }
/* Why: 上一级仍是主标题，但缩小两级字号差，避免当前产品名称显得过弱。 */
.product-detail-banner h1 { font-size: clamp(28px, 2.6vw, 40px); }
.product-detail-banner .detail-banner-subtitle { margin: 8px 0 0; font-size: clamp(18px, 1.6vw, 24px); font-weight: 500; letter-spacing: 0; }
/* 固定单项宽度并让容器居中，确保不足整行的最后一行仍保持视觉平衡。 */
.about-gallery { display: flex; flex-wrap: wrap; justify-content: center; gap: 30px; margin-top: 60px; }
.about-gallery-item { flex: 0 0 calc((100% - 60px) / 3); min-width: 0; margin: 0; text-align: center; }
.about-gallery.equipment_gallery .about-gallery-item,
.about-gallery.honor_gallery .about-gallery-item { flex-basis: calc((100% - 90px) / 4); }
.about-gallery.logo_gallery { align-items: stretch; }
.about-gallery.logo_gallery .about-gallery-item { flex-basis: calc((100% - 120px) / 5); }
.gallery-preview-button { width: 100%; padding: 0; border: 0; background: #f4f5f6; cursor: zoom-in; }
.gallery-preview-button img { display: block; width: 100%; height: 270px; object-fit: cover; }
/* Why: 特征参数图需要完整呈现，不能继承普通图库的固定高度裁剪规则。 */
.product-feature-column .gallery-preview-button img { width: 100%; height: 100%; object-fit: contain; object-position: center; }
.honor_gallery .gallery-preview-button img { height: 350px; padding: 22px; object-fit: contain; }
.logo_gallery .gallery-preview-button { display: grid; place-items: center; height: 160px; padding: 24px; background: #fff; border: 1px solid var(--line); }
.logo_gallery .gallery-preview-button img { width: 100%; height: 100%; object-fit: contain; }
.about-gallery-item figcaption { padding: 14px 8px; color: #383c3f; line-height: 1.5; }
.company-profile-layout { display: grid; grid-template-columns: minmax(280px, .75fr) minmax(0, 2fr); gap: clamp(60px, 9vw, 150px); align-items: start; }
.company-profile-layout aside { display: grid; }
.company-profile-layout aside strong { color: #df1f26; font-size: clamp(44px, 4vw, 64px); line-height: 1; white-space: nowrap; }
.company-profile-layout aside span { margin-top: 12px; font-size: 20px; font-weight: 700; }
.company-profile-layout article { max-width: none; font-size: 18px; }
.company-profile-layout.without-year { grid-template-columns: minmax(0, 1fr); }
.gallery-lightbox { position: fixed; inset: 0; z-index: 1200; display: grid; place-items: center; padding: 50px; background: rgba(0,0,0,.86); }
.gallery-lightbox[hidden] { display: none; }
.gallery-lightbox img { max-width: min(1200px, 90vw); max-height: 82vh; object-fit: contain; }
.gallery-lightbox p { position: absolute; bottom: 16px; color: #fff; }
.gallery-lightbox-close { position: absolute; top: 18px; right: 28px; border: 0; background: none; color: #fff; font-size: 44px; }
.modal-open { overflow: hidden; }
.feature-lightbox { padding: 20px; background: rgba(0,0,0,.72); }
/* Why: 性能参数表文字细密，弹窗尽量利用视口并默认适度放大，减少用户首次查看时的额外操作。 */
.feature-lightbox-panel { position: relative; display: grid; grid-template-rows: minmax(0, 1fr) auto auto; width: min(1480px, 96vw); height: 92vh; padding: 54px 72px 20px; overflow: hidden; border-radius: 8px; background: #fff; box-shadow: 0 18px 60px rgba(0,0,0,.35); }
.feature-lightbox-stage { min-height: 0; overflow: auto; overscroll-behavior: contain; }
/* Why: 画布尺寸随缩放倍率真实变化，按钮缩放后既有明确反馈，也能通过滚动查看放大区域。 */
.feature-lightbox-canvas { display: grid; place-items: center; width: 100%; height: 100%; min-width: 100%; min-height: 100%; }
.feature-lightbox .feature-lightbox-stage img { display: block; width: auto; height: auto; max-width: min(1240px, 82vw); max-height: 72vh; object-fit: contain; transform-origin: center; transition: transform .16s ease; }
.feature-lightbox .gallery-lightbox-close { top: 6px; right: 16px; color: #303438; }
.feature-lightbox-nav { position: absolute; z-index: 2; top: 50%; width: 52px; height: 72px; border: 0; border-radius: 4px; background: rgba(47,49,51,.78); color: #fff; font-size: 48px; line-height: 1; transform: translateY(-50%); }
.feature-lightbox-nav:hover { background: var(--brand-red); }
.feature-lightbox-prev { left: 12px; }
.feature-lightbox-next { right: 12px; }
.feature-lightbox-controls { display: flex; justify-content: center; gap: 8px; margin-top: 14px; }
.feature-lightbox-controls button { min-width: 44px; padding: 7px 12px; border: 1px solid #d7dadd; border-radius: 4px; background: #fff; color: #303438; }
.feature-lightbox-controls button:hover { border-color: var(--brand-red); color: var(--brand-red); }
.feature-lightbox p { position: static; margin: 8px 0 0; color: #555b60; text-align: center; }

.contact-summary { margin-bottom: 45px; text-align: center; }
.contact-summary h2 { font-size: clamp(30px, 3vw, 48px); }
.contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(380px, .9fr); gap: 55px; align-items: center; }
.contact-layout.single-column { grid-template-columns: minmax(0, 900px); justify-content: center; }
.contact-content { font-size: 16px; }
.contact-primary-address { padding-bottom: 18px; border-bottom: 1px solid var(--line); color: var(--ink); font-size: 18px; font-weight: 600; }
.contact-map-static { margin: 0; }
.contact-map-static img { display: block; width: 100%; height: auto; }

.site-footer { position: relative; padding: 70px 0 24px; background: #1d1d1e; color: #87898c; }
.footer-shell { max-width: 1920px; padding: 0 clamp(30px, 5vw, 95px); }
.footer-brand { text-align: center; }
.footer-brand img { width: auto; max-width: 300px; height: 82px; object-fit: contain; }
.footer-brand p { margin: 14px 0 0; color: #e2e2e2; font-size: 20px; }
.footer-columns { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: clamp(30px, 5vw, 90px); margin: 62px auto; }
.product-center-page { min-height: 300px; }
.footer-columns h2 { margin: 0 0 22px; color: #fff; font-size: 18px; }
.footer-columns a { display: block; padding: 6px 0; color: #85878a; }
.footer-columns a:hover { color: #fff; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-top: 22px; border-top: 1px solid #303031; color: #b8babc; font-size: 14px; }
.footer-bottom p { margin: 0; }
.footer-meta { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 14px 26px; }
.footer-meta a { color: #b8babc; }
.footer-meta a:hover { color: #fff; }

/* Why: 联系方式固定在独立入口中，既保持全站可达，也避免电话和二维码打断页脚信息层级。 */
.floating-contact { position: fixed; right: 20px; top: 66%; z-index: 1080; display: grid; gap: 8px; transform: translateY(-50%); }
.floating-contact-item { position: relative; }
.floating-contact-button { position: relative; z-index: 2; display: grid; place-items: center; width: 52px; height: 52px; padding: 0; border: 1px solid rgba(255,255,255,.42); border-radius: 2px; background: rgba(58,60,62,.68); color: #fff; font-size: 22px; box-shadow: 0 6px 18px rgba(0,0,0,.1); backdrop-filter: blur(3px); transition: background-color .2s ease, transform .2s ease; }
.floating-contact-button:hover,
.floating-contact-button:focus-visible,
.floating-contact-button[aria-expanded="true"] { background: rgba(35,37,39,.94); transform: translateX(-2px); }
.floating-contact-panel { position: absolute; top: 50%; right: calc(100% + 10px); visibility: hidden; opacity: 0; transform: translate(10px, -50%); pointer-events: none; padding: 15px 18px; border: 1px solid #e3e5e7; border-radius: 8px; background: #fff; box-shadow: 0 12px 35px rgba(0,0,0,.15); transition: opacity .18s ease, transform .18s ease, visibility .18s ease; }
.floating-contact-item:hover .floating-contact-panel,
.floating-contact-item:focus-within .floating-contact-panel,
.floating-contact-item.is-open .floating-contact-panel { visibility: visible; opacity: 1; transform: translate(0, -50%); pointer-events: auto; }
.floating-contact-phone { min-width: 190px; text-align: center; white-space: nowrap; }
.floating-contact-phone a { color: #24282c; font-size: 17px; font-weight: 700; }
.floating-contact-phone a:hover { color: var(--brand-red); }
.floating-contact-wechat { box-sizing: content-box; width: 150px; height: 150px; padding: 12px; }
.floating-contact-wechat img { display: block; width: 150px; max-width: none; height: 150px; object-fit: contain; }

/* 面包屑固定在头图与正文之间，让全站返回路径保持一致。 */
.page-breadcrumb { border-bottom: 1px solid #eceeef; background: #fff; }
.page-breadcrumb .container-xl { overflow-x: auto; scrollbar-width: none; }
.page-breadcrumb .container-xl::-webkit-scrollbar { display: none; }
.page-breadcrumb ol { display: flex; align-items: center; min-width: max-content; margin: 0; padding: 16px 0; list-style: none; }
.page-breadcrumb li { display: flex; align-items: center; color: #85898d; font-size: 14px; white-space: nowrap; }
.page-breadcrumb li + li::before { content: ">"; margin: 0 12px; color: #b4b7ba; font-size: 11px; }
.page-breadcrumb a { color: #666b70; transition: color .2s ease; }
.page-breadcrumb a:hover { color: #df1f26; }
.page-breadcrumb .current { max-width: min(440px, 42vw); color: #24282c; font-weight: 600; }
.page-breadcrumb .current span { overflow: hidden; text-overflow: ellipsis; }

/* Why: 分类层级依靠标题、字号和留白表达，避免卡片边框与折叠交互掩盖产品名称。 */
.product-tree-wrap { padding: 52px 0 70px; background: #fff; }
.product-directory { display: grid; gap: 38px; }
.product-directory-group { padding-bottom: 34px; border-bottom: 1px solid #eceeef; scroll-margin-top: 120px; }
.product-directory-group:last-child { padding-bottom: 0; border-bottom: 0; }
.product-directory-group h2 { margin: 0 0 24px; color: #22272b; font-size: 27px; font-weight: 700; }
.product-directory-group h2::after { content: ""; display: block; width: 34px; height: 3px; margin-top: 10px; background: var(--brand-red); }
.product-directory-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px 56px; padding-left: clamp(24px, 4vw, 66px); }
.product-directory-item { min-width: 0; }
.product-directory-title { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: #2f3438; font-size: 18px; line-height: 1.55; }
.product-directory-title i { flex: 0 0 auto; color: #b4b8bb; font-size: 13px; transition: transform .2s ease, color .2s ease; }
.product-directory-title:hover { color: var(--brand-red); }
.product-directory-title:hover i { color: var(--brand-red); transform: translateX(4px); }
.product-directory-series { display: flex; flex-wrap: wrap; gap: 7px 18px; margin-top: 10px; }
.product-directory-series a { color: #8a8f93; font-size: 13px; }
.product-directory-series a:hover { color: var(--brand-red); }
.solution-preview-heading { margin-bottom: 20px; text-align: center; }
.solution-preview-heading .eyebrow { margin-bottom: 12px; }
.solution-preview-heading h2 { margin: 0; }