:root {
  --navy: #082e58;
  --navy-deep: #061f3d;
  --blue: #1266a4;
  --sky: #39a8d4;
  --ink: #152b43;
  --muted: #617387;
  --line: #dce6ee;
  --soft: #f4f8fb;
  --pale: #eaf5fb;
  --white: #ffffff;
  --warm: #d6a94d;
  --shadow: 0 18px 42px rgba(8, 46, 88, 0.12);
  --shell: 1240px;
  --radius: 4px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body { margin: 0; overflow-x: hidden; color: var(--ink); background: var(--white); font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.65; }
body.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.shell { width: min(var(--shell), calc(100% - 48px)); margin: 0 auto; }
.skip-link { position: absolute; top: -48px; left: 18px; z-index: 50; padding: 8px 14px; color: var(--white); background: var(--navy); }
.skip-link:focus { top: 18px; }

.site-header { position: sticky; top: 0; z-index: 30; background: rgba(255, 255, 255, 0.97); box-shadow: 0 1px 0 rgba(8, 46, 88, 0.08); backdrop-filter: blur(12px); }
.nav { position: relative; display: flex; align-items: center; justify-content: space-between; width: min(1400px, calc(100% - 40px)); min-height: 60px; margin: 0 auto; gap: 32px; }
.brand { display: grid; gap: 3px; min-width: 270px; }
.brand-name { color: var(--navy); font-size: 18px; font-weight: 800; line-height: 1.2; }
.brand-en { color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: 0.08em; line-height: 1.35; text-transform: uppercase; }
.primary-nav { position: absolute; right: 0; left: 0; display: flex; align-items: center; justify-content: center; gap: 30px; pointer-events: none; font-size: 14px; font-weight: 600; letter-spacing: 0; text-transform: none; }
.primary-nav > * { pointer-events: auto; }
.nav-link { position: relative; display: inline-flex; align-items: center; min-height: 60px; color: var(--ink); transition: color 0.2s ease; }
.nav-link::after { position: absolute; right: 0; bottom: 0; left: 0; height: 3px; content: ""; background: var(--sky); transform: scaleX(0); transform-origin: center; transition: transform 0.2s ease; }
.nav-link:hover, .nav-link.is-current { color: var(--blue); }
.nav-link:hover::after, .nav-link.is-current::after { transform: scaleX(1); }
.lang-toggle, .menu-toggle { color: var(--navy); background: var(--white); border: 1px solid #b9ccdc; cursor: pointer; }
.lang-toggle { position: absolute; top: 12px; right: 0; min-width: 80px; height: 36px; padding: 0 10px; border-radius: 3px; font-size: 12px; font-weight: 700; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 9px; border-radius: 3px; }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 4px 0; background: var(--navy); }

body[data-page="home"] .site-header { position: absolute; right: 0; left: 0; background: transparent; box-shadow: none; backdrop-filter: none; }
body[data-page="home"] .site-header:not(.is-scrolled) .brand-name, body[data-page="home"] .site-header:not(.is-scrolled) .brand-en, body[data-page="home"] .site-header:not(.is-scrolled) .nav-link { color: var(--white); }
body[data-page="home"] .site-header:not(.is-scrolled) .brand-en { color: #dceaf6; }
body[data-page="home"] .site-header:not(.is-scrolled) .nav-link:hover, body[data-page="home"] .site-header:not(.is-scrolled) .nav-link.is-current { color: #bcecff; }
body[data-page="home"] .site-header.is-scrolled { background: rgba(255, 255, 255, 0.97); box-shadow: 0 1px 0 rgba(8, 46, 88, 0.08); }
body[data-page="home"] .nav { width: min(1400px, calc(100% - 40px)); min-height: 60px; }
body[data-page="home"] .nav-link { min-height: 60px; }

.hero { position: relative; min-height: 610px; overflow: hidden; background: var(--navy); }
.hero-background { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; animation: hero-drift 18s ease-in-out infinite alternate; }
.hero-shade, .page-banner-shade { position: absolute; inset: 0; background: rgba(4, 35, 68, 0.66); }
.hero-content { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; min-height: 610px; padding: 78px 0; color: var(--white); }
.eyebrow { margin: 0 0 12px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: 0.15em; line-height: 1.3; text-transform: uppercase; }
.eyebrow-light { color: #9ddcf4; }
h1, h2, h3, p { overflow-wrap: anywhere; word-break: break-word; }
h1, h2, h3 { margin-top: 0; }
h1 { max-width: 760px; margin-bottom: 20px; font-size: clamp(38px, 5vw, 68px); line-height: 1.08; letter-spacing: 0; }
h2 { margin-bottom: 18px; font-size: clamp(30px, 3.5vw, 48px); line-height: 1.18; letter-spacing: 0; }
h3 { margin-bottom: 9px; font-size: 21px; line-height: 1.25; }
.hero-lead { max-width: 660px; margin: 0 0 32px; color: #e6f3fb; font-size: 17px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 11px 23px; border: 1px solid transparent; border-radius: 3px; font-size: 13px; font-weight: 800; letter-spacing: 0.05em; text-transform: uppercase; transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--blue); }
.button-primary:hover { background: var(--navy); }
.button-light { color: var(--navy); background: var(--white); }
.button-light:hover { color: var(--white); background: transparent; border-color: rgba(255, 255, 255, 0.8); }

body[data-page="home"] .hero, body[data-page="home"] .hero-content { min-height: 95svh; }
body[data-page="home"] .hero-picture { position: absolute; inset: 0; }
body[data-page="home"] .hero-content { justify-content: center; width: min(1420px, calc(100% - 20px)); margin: 0 auto; padding: 0 0 10px; }
body[data-page="home"] .hero-shade { background: rgba(4, 35, 68, 0.28); }
body[data-page="home"] .hero h1 { max-width: 700px; margin-bottom: 20px; font-size: 24px; line-height: 1; }
body[data-page="home"] .hero-lead { max-width: 700px; margin-bottom: 35px; font-size: 16px; line-height: 1.6; }
body[data-page="home"] .hero .button-primary { width: 164px; min-width: 164px; height: 35px; min-height: 35px; padding: 0 28px; font-size: 15px; font-weight: 500; letter-spacing: 0; text-transform: none; }
body[data-page="home"] .hero .button-light { color: var(--white); background: var(--blue); }
body[data-page="home"] .hero .button-light:hover { background: var(--navy); border-color: transparent; }

.source-shell { width: calc(100% - 40px); max-width: none; margin: 0 auto; }
.source-intro { padding: 42px 0 30px; background: var(--white); }
.source-intro h2 { max-width: 1100px; margin-right: auto; margin-left: auto; font-size: 32px; }
.source-intro p { max-width: 1080px; margin: 0 auto; color: #303030; font-size: 16px; line-height: 1.7; }
.source-categories { padding: 0 0 64px; background: var(--white); }
.source-category-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.source-category { display: block; text-align: center; }
.source-category-media { display: block; height: 345px; overflow: hidden; background: #f3f5f7; }
.source-category-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.65s ease; }
.source-category-media-contain img { object-fit: cover; padding: 0; }
.source-category:hover .source-category-media img { transform: scale(1.035); }
.source-category h3 { margin: 20px 0 0; color: #111; font-size: 24px; font-weight: 700; }
.source-advantages { padding: 70px 0 78px; background: #f5f5f5; }
.source-heading { margin-bottom: 38px; }
.source-heading h2 { margin-bottom: 0; color: #111; font-size: 34px; }
.source-advantage-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; }
.source-advantage-card { min-height: 244px; padding: 31px 28px; background: var(--white); border-radius: 7px; box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05); text-align: center; }
.source-advantage-card strong { display: block; margin-bottom: 16px; color: #176bb0; font-size: 42px; line-height: 1.1; }
.source-advantage-card:nth-child(4) strong { font-size: 30px; line-height: 1.55; }
.source-advantage-card h3 { color: #111; font-size: 20px; }
.source-advantage-card p { margin: 0; color: #555; font-size: 15px; line-height: 1.65; }
.source-feature-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); min-height: 569px; background: var(--white); }
.source-feature-row.source-feature-reverse .source-feature-media { order: 2; }
.source-feature-row.source-feature-reverse .source-feature-copy { order: 1; }
.source-feature-media { display: grid; place-items: center; min-height: 569px; overflow: hidden; background: var(--white); }
.source-feature-media img { width: min(800px, 100%); height: 569px; min-height: 0; object-fit: cover; transition: transform 0.8s ease; }
.source-feature-media:hover img { transform: scale(1.025); }
.source-feature-copy { display: flex; flex-direction: column; align-items: flex-start; justify-content: center; min-height: 569px; padding: 52px 48px; }
.source-feature-copy .eyebrow { display: none; }
.source-feature-copy h2 { max-width: 590px; color: #111; font-size: 28px; line-height: 1.24; }
.source-feature-copy > p:not(.eyebrow) { max-width: 800px; margin: 0 0 14px; color: #222; font-size: 18px; line-height: 1.5; }
.source-feature-copy > p:not(.eyebrow):last-of-type { margin-bottom: 0; }
.source-feature-copy .button { display: none; }
.source-cta { position: relative; min-height: 285px; color: var(--white); background: url("assets/cta-solar.jpg") center 54% / cover no-repeat; }
.source-cta-shade { position: absolute; inset: 0; background: rgba(5, 44, 88, 0.84); }
.source-cta-inner { position: relative; display: flex; align-items: center; justify-content: space-between; min-height: 285px; gap: 32px; }
.source-cta h2 { max-width: 760px; margin: 0; font-size: 36px; }
.source-blog { padding: 82px 0 96px; background: var(--white); }
.source-blog-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px; }
.source-blog-item { min-height: 220px; padding: 16px 8px 22px; border-top: 1px solid #d8d8d8; transition: transform 0.25s ease, border-color 0.25s ease; }
.source-blog-item:hover { border-color: var(--blue); transform: translateY(-4px); }
.source-blog-item span { display: block; margin-bottom: 24px; color: #2c72ae; font-size: 14px; font-weight: 700; }
.source-blog-item h3 { color: #111; font-size: 21px; }
.source-blog-item p { margin: 0; color: #555; font-size: 15px; }

.section { padding: 104px 0; }
.intro-section { padding-bottom: 92px; }
.narrow { max-width: 850px; }
.center { text-align: center; }
.section-lead, .section-heading > p:not(.eyebrow) { max-width: 760px; margin: 20px 0 0; color: var(--muted); font-size: 17px; }
.center .section-lead, .section-heading.center > p:not(.eyebrow) { margin-right: auto; margin-left: auto; }
.section-heading { margin-bottom: 44px; }
.category-preview-section, .capability-section, .about-intro, .contact-section { background: var(--soft); }
.category-preview-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.home-category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.home-category-grid .category-image { height: 300px; }
.category-preview { overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 8px 24px rgba(8, 46, 88, 0.04); transition: transform 0.25s ease, box-shadow 0.25s ease; }
.category-preview:hover { box-shadow: var(--shadow); transform: translateY(-5px); }
.category-image { height: 240px; overflow: hidden; background: #edf5fa; }
.category-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1); }
.category-preview:hover .category-image img { transform: scale(1.06); }
.category-preview:nth-child(3) .category-image img { object-fit: contain; padding: 28px; }
.category-body { padding: 26px 27px 30px; }
.category-index, .capability-number { display: block; margin-bottom: 14px; color: var(--sky); font-size: 13px; font-weight: 800; letter-spacing: 0.12em; }
.category-body p, .capability-card p, .feature-copy > p, .about-copy > p, .contact-copy > p { margin: 0; color: var(--muted); font-size: 15px; }
.text-link { display: inline-flex; align-items: center; gap: 9px; margin-top: 22px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: 0.06em; text-transform: uppercase; }
.text-link span { font-size: 18px; line-height: 0; transition: transform 0.2s ease; }
.text-link:hover span { transform: translateX(4px); }

.metrics-section { background: var(--white); }
.metric-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.metric-card { min-height: 214px; padding: 28px 25px; border-top: 3px solid var(--sky); background: var(--soft); transition: transform 0.25s ease, background 0.25s ease, box-shadow 0.25s ease; }
.metric-card:hover { background: var(--pale); box-shadow: var(--shadow); transform: translateY(-5px); }
.metric-value { display: block; margin-bottom: 22px; color: var(--blue); font-size: 24px; font-weight: 800; letter-spacing: 0.08em; }
.metric-card h3 { font-size: 18px; }
.metric-card p { margin: 0; color: var(--muted); font-size: 14px; }

.integrated-section { background: var(--white); }
.feature-layout { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); align-items: center; gap: 72px; }
.feature-image { position: relative; }
.feature-image::after { position: absolute; right: -18px; bottom: -18px; z-index: -1; width: 68%; height: 68%; content: ""; background: var(--pale); }
.feature-image img { width: 100%; height: 360px; min-height: 0; object-fit: contain; border-radius: var(--radius); background: #f1f6fa; }
.feature-image img { transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1); }
.feature-image:hover img { transform: scale(1.02); }
.feature-copy h2 { max-width: 560px; }
.feature-copy > p { max-width: 560px; margin-bottom: 28px; font-size: 17px; }

.showcase-section { background: var(--soft); }
.showcase-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.showcase-card { overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); transition: transform 0.25s ease, box-shadow 0.25s ease; }
.showcase-card:hover { box-shadow: var(--shadow); transform: translateY(-5px); }
.showcase-media { height: 224px; overflow: hidden; background: #eef5f9; }
.showcase-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1); }
.showcase-card:nth-child(2) .showcase-media img { object-fit: contain; padding: 18px; }
.showcase-card:hover .showcase-media img { transform: scale(1.06); }
.showcase-body { padding: 25px 26px 29px; }
.showcase-body p { margin: 0; color: var(--muted); font-size: 14px; }
.capability-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.capability-card { min-height: 210px; padding: 31px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.capability-card p { font-size: 15px; }

.insights-section { background: var(--white); }
.insight-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.insight-card { position: relative; min-height: 260px; padding: 30px 28px; border: 1px solid var(--line); background: var(--white); transition: box-shadow 0.25s ease, transform 0.25s ease; }
.insight-card:hover { box-shadow: var(--shadow); transform: translateY(-5px); }
.insight-line { display: block; width: 42px; height: 3px; margin-bottom: 29px; background: var(--sky); transition: width 0.35s ease; }
.insight-card:hover .insight-line { width: 76px; }
.insight-card p { margin: 0; color: var(--muted); font-size: 15px; }
.cta-band { color: var(--white); background: var(--navy); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; min-height: 240px; gap: 32px; }
.cta-inner h2 { margin-bottom: 0; }

.page-banner { position: relative; min-height: 205px; overflow: hidden; color: var(--white); background: var(--navy); }
.page-banner-background { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; animation: hero-drift 20s ease-in-out infinite alternate; }
.page-banner-content { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 205px; padding: 28px 0; text-align: center; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 9px; margin: 0 0 20px; color: #cfe5f3; font-size: 12px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.breadcrumb a:hover { color: var(--white); }
.page-banner h1 { margin-bottom: 8px; font-size: 36px; }
.page-banner p:not(.eyebrow):not(.breadcrumb) { max-width: 660px; margin: 0; color: #e4f2f9; font-size: 17px; }

.products-layout { display: grid; grid-template-columns: 275px minmax(0, 1fr); align-items: start; gap: 42px; }
.products-layout > .product-content { min-width: 0; }
body[data-page="products"] main > .section { padding: 40px 0 84px; }
.product-sidebar { position: sticky; top: 112px; border: 1px solid var(--line); background: var(--white); }
.sidebar-title { padding: 17px 16px; color: #111; background: var(--white); border-bottom: 1px solid #e5e5e5; font-size: 14px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.product-sidebar ul { display: grid; gap: 0; margin: 0; padding: 7px 0; list-style: none; }
.product-sidebar li a { display: block; padding: 12px 16px; border-left: 3px solid transparent; color: #444; font-size: 14px; transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease; }
.product-sidebar li a::before { margin-right: 5px; content: "›"; }
.product-sidebar li a:hover, .product-sidebar li a.is-active { color: var(--blue); background: #f3f7fa; border-left-color: var(--sky); }
.product-sidebar li a:focus, .product-sidebar li a:focus-visible { outline: none; }
.product-content > .section-heading { margin-bottom: 52px; }
.product-content > .section-heading .eyebrow { display: none; }
.product-content > .section-heading h2 { padding-bottom: 15px; border-bottom: 1px solid #e5e5e5; font-size: 30px; }
.product-content > .section-heading p:not(.eyebrow) { max-width: 760px; margin: 0; color: var(--muted); font-size: 16px; }
.category-block { scroll-margin-top: 120px; padding-top: 26px; margin-top: 42px; border-top: 1px solid var(--line); }
.category-block[hidden] { display: none !important; }
.category-block:first-of-type { padding-top: 0; margin-top: 0; border-top: 0; }
.category-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 28px; margin-bottom: 24px; }
.category-heading h2 { margin-bottom: 6px; font-size: 31px; }
.category-heading p { max-width: 670px; margin: 0; color: var(--muted); }
.category-code { flex: 0 0 auto; color: var(--sky); font-size: 13px; font-weight: 800; letter-spacing: 0.12em; }
.product-card-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.product-pagination { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 28px; }
.product-pagination-control, .product-pagination-page { display: inline-grid; place-items: center; min-width: 34px; height: 34px; padding: 0 10px; border: 1px solid #d9e1e7; color: #536a7f; font-size: 13px; line-height: 1; transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease; }
.product-pagination-control { font-size: 20px; }
.product-pagination-control:hover, .product-pagination-page:hover { color: var(--blue); border-color: var(--sky); background: #f3f7fa; }
.product-pagination-page.is-current { color: var(--white); border-color: var(--blue); background: var(--blue); }
.product-pagination-control.is-disabled { cursor: default; opacity: 0.38; }
.product-tile { overflow: hidden; background: var(--white); border: 1px solid #dedede; border-radius: 0; transition: transform 0.25s ease, box-shadow 0.25s ease; }
.product-tile:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.product-tile-link { display: block; height: 100%; }
.product-tile-link:focus-visible { outline: 3px solid rgba(57, 168, 212, 0.36); outline-offset: -3px; }
.product-tile-media { display: grid; place-items: center; height: 285px; overflow: hidden; background: var(--white); }
.product-tile-media img, .product-tile-media img.contain { width: 92%; height: 92%; object-fit: contain; }
.product-tile-body { display: grid; place-items: center; min-height: 78px; padding: 14px 12px 16px; border-top: 1px solid #e5e5e5; text-align: center; }
.product-tile-body h3 { margin: 0; font-size: 15px; font-weight: 500; line-height: 1.35; }
.product-tile-body p { display: none; }

.product-detail-section { padding: 58px 0 72px; background: var(--white); }
.product-detail-layout { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); align-items: start; gap: 64px; }
.product-detail-image-frame { display: grid; place-items: center; min-height: 590px; overflow: hidden; background: #f5f7f8; border: 1px solid #e3e8eb; }
.product-detail-image-frame img { width: 100%; height: 590px; padding: 34px; object-fit: contain; }
.product-detail-summary { padding-top: 3px; }
.product-detail-summary h2 { margin-bottom: 14px; color: #111; font-size: 34px; }
.product-detail-lead { margin: 0 0 26px; color: var(--muted); font-size: 16px; line-height: 1.75; }
.product-spec-table-wrap { overflow-x: auto; border-top: 1px solid #d9e1e7; }
.product-spec-table { width: 100%; border-collapse: collapse; color: #27394b; font-size: 14px; }
.product-spec-table th, .product-spec-table td { min-width: 128px; padding: 14px 13px; border-right: 1px solid #e2e7eb; border-bottom: 1px solid #e2e7eb; text-align: center; }
.product-spec-table th:first-child, .product-spec-table td:first-child { width: 34%; min-width: 160px; text-align: left; }
.product-spec-table th:last-child, .product-spec-table td:last-child { border-right: 0; }
.product-spec-table thead th { color: #111; background: #f3f6f8; font-weight: 700; }
.product-spec-table tbody tr:nth-child(even) td { background: #fafcfd; }
.product-detail-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button-outline { color: var(--blue); background: var(--white); border-color: var(--blue); }
.button-outline:hover { color: var(--white); background: var(--blue); }
.product-description-section { padding: 0 0 82px; background: var(--white); }
.product-tab-heading { padding: 17px 21px; color: var(--white); background: var(--navy); font-size: 15px; font-weight: 700; }
.product-description-grid { display: grid; grid-template-columns: minmax(0, 1fr) 360px; align-items: center; gap: 60px; padding: 48px 0 0; }
.product-description-copy h2 { color: #111; font-size: 30px; }
.product-description-copy > p { max-width: 740px; margin: 0 0 22px; color: var(--muted); font-size: 16px; }
.product-feature-list { display: grid; gap: 9px; padding: 0; margin: 0; list-style: none; }
.product-feature-list li { position: relative; padding-left: 18px; color: #354a60; font-size: 15px; }
.product-feature-list li::before { position: absolute; top: 0.66em; left: 0; width: 6px; height: 6px; content: ""; background: var(--sky); border-radius: 50%; }
.product-description-media { display: grid; place-items: center; min-height: 390px; background: #f5f7f8; }
.product-description-media img { width: 100%; height: 390px; padding: 24px; object-fit: contain; }
.related-products-section { padding: 78px 0 92px; background: var(--soft); }
.related-products-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.related-product { display: block; overflow: hidden; background: var(--white); border: 1px solid #dde5eb; transition: transform 0.25s ease, box-shadow 0.25s ease; }
.related-product:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.related-product img { width: 100%; height: 235px; padding: 18px; object-fit: contain; background: var(--white); }
.related-product h3 { min-height: 67px; margin: 0; padding: 17px 16px; border-top: 1px solid #e5e9ec; color: #111; font-size: 15px; font-weight: 500; text-align: center; }

.about-layout, .contact-layout { display: grid; grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr); align-items: start; gap: 72px; }
.about-image img { width: 100%; min-height: 430px; object-fit: cover; border-radius: var(--radius); }
.about-copy h2, .contact-copy h2 { margin-bottom: 22px; }
.about-copy > p, .contact-copy > p { margin-bottom: 18px; font-size: 17px; }
.principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; margin-top: 42px; }
.principle { padding: 25px; border: 1px solid var(--line); background: var(--white); }
.principle h3 { font-size: 18px; }
.principle p { margin: 0; color: var(--muted); font-size: 14px; }
.contact-layout { align-items: stretch; }
.contact-card { padding: 34px; color: var(--white); background: var(--navy); border-radius: var(--radius); }
.contact-card h2 { margin-bottom: 24px; font-size: 32px; }
.contact-list { display: grid; gap: 0; padding: 0; margin: 0; list-style: none; }
.contact-list li { display: grid; grid-template-columns: 86px minmax(0, 1fr); gap: 14px; padding: 15px 0; border-top: 1px solid rgba(255, 255, 255, 0.18); }
.contact-list li:last-child { border-bottom: 1px solid rgba(255, 255, 255, 0.18); }
.contact-list strong { color: #a9dcef; font-size: 13px; }
.contact-list span, .contact-list a { color: #f3fbff; font-size: 14px; }
.contact-list a:hover { color: #a9dcef; }
.contact-note { margin: 26px 0 0; color: #d4eaf4; font-size: 14px; }
.contact-details { padding: 34px; background: var(--white); border: 1px solid var(--line); }
.contact-details h2 { font-size: 31px; }
.contact-details p { margin: 0 0 24px; color: var(--muted); }
.contact-points { display: grid; gap: 12px; padding: 0; margin: 0; list-style: none; }
.contact-points li { padding: 16px; color: var(--muted); background: var(--soft); border-left: 3px solid var(--sky); }
.contact-points strong { display: block; margin-bottom: 3px; color: var(--ink); }

.site-footer { color: #d4e2ed; background: var(--navy-deep); }
.footer-main { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(150px, 0.6fr)); gap: 58px; padding: 62px 0 48px; }
.footer-brand { display: grid; align-content: start; gap: 7px; }
.footer-brand strong { color: var(--white); font-size: 18px; }
.footer-brand span { color: #8eb3ca; font-size: 11px; letter-spacing: 0.06em; }
.footer-brand p { max-width: 360px; margin: 11px 0 0; color: #b4cbd9; font-size: 14px; }
.footer-column { display: grid; align-content: start; gap: 10px; }
.footer-column h3 { margin-bottom: 8px; color: var(--white); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; }
.footer-column a, .footer-column span { color: #b4cbd9; font-size: 13px; }
.footer-column a:hover { color: var(--white); }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; padding: 18px 0 22px; border-top: 1px solid rgba(255, 255, 255, 0.14); color: #8eacbe; font-size: 12px; }
.beian-line { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 7px 14px; }
.beian-police { display: inline-flex; align-items: center; gap: 4px; white-space: nowrap; }
.beian-line img { width: 16px; height: 18px; object-fit: contain; }
.beian-line a { color: #8eacbe; }
.beian-line a:hover { color: var(--white); }

.fade-in { opacity: 0; animation: fade-in 0.9s ease 0.08s forwards; }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.category-preview-grid .reveal:nth-child(2), .metric-grid .reveal:nth-child(2), .showcase-grid .reveal:nth-child(2), .capability-grid .reveal:nth-child(2), .insight-grid .reveal:nth-child(2) { transition-delay: 0.08s; }
.category-preview-grid .reveal:nth-child(3), .metric-grid .reveal:nth-child(3), .showcase-grid .reveal:nth-child(3), .capability-grid .reveal:nth-child(3), .insight-grid .reveal:nth-child(3) { transition-delay: 0.16s; }
.metric-grid .reveal:nth-child(4) { transition-delay: 0.24s; }
@keyframes fade-in { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@keyframes hero-drift { from { transform: scale(1.02) translate3d(-0.5%, 0, 0); } to { transform: scale(1.06) translate3d(0.5%, -0.5%, 0); } }
.lang-toggle:focus, .menu-toggle:focus, .button:focus, .nav-link:focus, .text-link:focus, .footer-column a:focus { outline: 3px solid rgba(57, 168, 212, 0.32); outline-offset: 3px; }

@media (max-width: 1040px) {
  .primary-nav { gap: 18px; }
  .feature-layout, .about-layout, .contact-layout { gap: 42px; }
  .products-layout { gap: 34px; }
  .product-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-detail-layout { gap: 38px; }
  .product-detail-image-frame, .product-detail-image-frame img { min-height: 500px; height: 500px; }
  .product-description-grid { grid-template-columns: minmax(0, 1fr) 300px; gap: 38px; }
  .related-products-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .source-category-media { height: 330px; }
  .source-feature-row, .source-feature-media, .source-feature-copy { min-height: 460px; }
  .source-feature-media img { height: 460px; min-height: 0; }
}

@media (max-width: 780px) {
  .shell { width: min(var(--shell), calc(100% - 32px)); }
  body { overflow-x: hidden; }
  .nav { min-height: 72px; }
  .brand { min-width: 0; max-width: 245px; }
  .brand-name { font-size: 15px; }
  .brand-en { font-size: 8px; }
  .menu-toggle { display: block !important; position: relative; z-index: 31; flex: 0 0 42px; margin-left: auto; }
  .primary-nav { position: fixed; top: 72px; right: 16px; left: 16px; display: none; align-items: stretch; flex-direction: column; gap: 0; padding: 8px 0; background: var(--white); border: 1px solid var(--line); box-shadow: var(--shadow); transform: none; }
  .primary-nav.is-open { display: flex; }
  .nav-link { min-height: 46px; padding: 0 20px; }
  .nav-link::after { top: 11px; right: auto; bottom: auto; left: 0; width: 3px; height: 24px; transform: scaleY(0); }
  .nav-link:hover::after, .nav-link.is-current::after { transform: scaleY(1); }
  .lang-toggle { position: static; align-self: flex-start; margin: 10px 20px; }
  .hero, .hero-content { min-height: 100svh; }
  .hero-content { padding: 64px 0; }
  h1 { max-width: 100%; font-size: clamp(34px, 10vw, 46px); }
  .hero-lead, .page-banner p:not(.eyebrow):not(.breadcrumb) { max-width: 100%; font-size: 15px; }
  .section { padding: 72px 0; }
  .category-preview-grid, .home-category-grid, .metric-grid, .showcase-grid, .capability-grid, .insight-grid, .principles, .product-card-grid { grid-template-columns: 1fr; }
  .source-shell { width: calc(100% - 32px); }
  .source-intro { padding: 66px 0 34px; }
  .source-intro h2 { font-size: 31px; }
  .source-intro p { font-size: 16px; }
  .source-category-grid, .source-advantage-grid, .source-blog-grid { grid-template-columns: 1fr; }
  .source-category-grid { gap: 38px; }
  .source-category-media { height: 270px; }
  .source-category h3 { margin-top: 15px; font-size: 21px; }
  .source-advantages { padding: 62px 0; }
  .source-advantage-grid { gap: 14px; }
  .source-advantage-card { min-height: 0; }
  .source-feature-row { grid-template-columns: 1fr; min-height: 0; }
  .source-feature-media, .source-feature-copy { min-height: 0; }
  .source-feature-media img { height: 315px; min-height: 315px; }
  .source-feature-copy { padding: 52px 24px 58px; }
  .source-feature-copy h2 { font-size: 29px; }
  .source-feature-copy > p:not(.eyebrow) { font-size: 16px; }
  .source-feature-row.source-feature-reverse .source-feature-copy { order: 1; }
  .source-feature-row.source-feature-reverse .source-feature-media { order: 2; }
  .source-cta-inner { align-items: flex-start; flex-direction: column; justify-content: center; min-height: 310px; }
  .source-cta h2 { font-size: 31px; }
  .source-blog-grid { gap: 12px; }
  .source-blog-item { min-height: 0; }
  .category-image { height: 250px; }
  .feature-layout, .about-layout, .contact-layout, .products-layout { grid-template-columns: 1fr; }
  .product-detail-layout, .product-description-grid { grid-template-columns: 1fr; }
  .feature-layout { gap: 42px; }
  .feature-image img, .about-image img { min-height: 280px; }
  .product-sidebar { position: static; }
  .category-heading { display: block; }
  .category-code { display: block; margin-top: 12px; }
  .product-tile-media { height: 320px; }
  .product-detail-section { padding: 34px 0 56px; }
  .product-detail-layout { gap: 34px; }
  .product-detail-image-frame, .product-detail-image-frame img { min-height: 420px; height: 420px; }
  .product-detail-image-frame img { padding: 20px; }
  .product-detail-summary h2 { font-size: 29px; }
  .product-spec-table th, .product-spec-table td { min-width: 118px; padding: 12px 10px; font-size: 13px; }
  .product-description-section { padding-bottom: 60px; }
  .product-description-grid { gap: 32px; padding-top: 34px; }
  .product-description-media, .product-description-media img { min-height: 330px; height: 330px; }
  .related-products-section { padding: 62px 0 72px; }
  .related-products-grid { grid-template-columns: 1fr; }
  .related-product img { height: 290px; }
  .cta-inner { align-items: flex-start; flex-direction: column; justify-content: center; min-height: 270px; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 36px 22px; padding: 46px 0 36px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { align-items: flex-start; flex-direction: column; padding-bottom: 20px; }
  body[data-page="home"] .nav { width: calc(100% - 32px); }
  body[data-page="home"] .hero-content { justify-content: flex-start; width: calc(100% - 32px); padding-top: 34vh; }
  body[data-page="home"] .hero h1 { font-size: 22px; line-height: 1.35; }
  body[data-page="home"] .hero-lead { font-size: 15px; line-height: 1.65; }
  body[data-page="home"] .hero-content h1, body[data-page="home"] .hero-content .hero-lead { width: 100%; max-width: 100%; word-break: break-all; }
  .hero-background, .page-banner-background { animation: none; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
}