:root {
  --ink: #111315;
  --ink-2: #1b1f22;
  --paper: #f6f5f1;
  --white: #fff;
  --muted: #656b6f;
  --line: rgba(17, 19, 21, .14);
  --accent: #63d2cd;
  --accent-warm: #f1a36f;
  --max: 1240px;
  --radius: 4px;
  --shadow: 0 24px 70px rgba(10, 14, 16, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif; -webkit-font-smoothing: antialiased; }
body.nav-open, body.language-open { overflow: hidden; }
img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
button { color: inherit; }
.button:focus-visible,
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.wrap { width: min(calc(100% - 56px), var(--max)); margin: 0 auto; }
.skip-link { position: fixed; z-index: 1000; left: 12px; top: -60px; padding: 10px 16px; color: #fff; background: #111; }
.skip-link:focus { top: 12px; }

.site-header { position: fixed; z-index: 100; inset: 0 0 auto; height: 82px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 28px; padding: 0 36px; color: #fff; border-bottom: 1px solid rgba(255,255,255,.14); transition: background .25s, color .25s, box-shadow .25s; }
.site-header.is-scrolled, .site-header.header-solid { color: var(--ink); background: rgba(255,255,255,.96); border-color: var(--line); box-shadow: 0 8px 30px rgba(12,16,18,.06); backdrop-filter: blur(16px); }
.brand { display: flex; align-items: center; gap: 13px; min-width: 188px; }
.brand img { width: 86px; height: auto; filter: brightness(0) invert(1); transition: filter .25s; }
.site-header.is-scrolled .brand img, .site-header.header-solid .brand img { filter: none; }
.brand span { display: grid; gap: 2px; padding-left: 12px; border-left: 1px solid currentColor; }
.brand strong { font-size: 15px; letter-spacing: .14em; }
.brand small { font-size: 8px; letter-spacing: .18em; opacity: .62; }
.main-nav { display: flex; justify-content: center; align-items: stretch; height: 82px; gap: clamp(16px, 2vw, 32px); }
.main-nav a { position: relative; display: grid; place-items: center; font-size: 14px; white-space: nowrap; }
.main-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 2px; background: var(--accent); transition: right .2s; }
.main-nav a:hover::after, .main-nav a.is-active::after { right: 0; }
.header-actions { display: flex; align-items: center; gap: 22px; }
.header-contact { display: grid; gap: 2px; text-align: right; }
.header-contact small { font-size: 10px; opacity: .65; }
.header-contact strong { font-size: 13px; letter-spacing: .04em; }
.global-trigger { border: 1px solid currentColor; background: transparent; padding: 10px 14px; cursor: pointer; font-size: 13px; white-space: nowrap; }
.global-trigger span { margin-left: 6px; }
.nav-toggle { display: none; border: 0; background: transparent; padding: 12px; cursor: pointer; }
.nav-toggle span { display: block; width: 24px; height: 1px; margin: 6px 0; background: currentColor; transition: transform .2s; }
.language-panel { position: fixed; z-index: 101; top: 82px; right: 28px; width: 470px; max-height: calc(100vh - 106px); overflow: auto; padding: 20px; color: var(--ink); background: #fff; box-shadow: var(--shadow); display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.language-panel[hidden] { display: none; }
.language-panel-head { grid-column: 1 / -1; display: flex; justify-content: space-between; padding: 2px 4px 14px; border-bottom: 1px solid var(--line); }
.language-panel-head span { color: var(--muted); font-size: 12px; }
.language-panel a { display: grid; grid-template-columns: 34px 1fr; grid-template-rows: auto auto; column-gap: 10px; padding: 13px; border: 1px solid transparent; background: #f7f7f5; transition: border .2s, transform .2s; }
.language-panel a:hover { border-color: var(--ink); transform: translateY(-1px); }
.language-panel a > span { grid-row: 1 / 3; align-self: center; color: var(--muted); font-size: 11px; }
.language-panel a strong { font-size: 14px; }
.language-panel a small { color: var(--muted); font-size: 10px; }

.hero { position: relative; min-height: 100svh; color: #fff; overflow: hidden; background: #111; }
.hero-media, .hero-media img, .hero-media video, .hero-scrim { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-media img, .hero-media video { object-fit: cover; }
.hero-media video { opacity: 0; transition: opacity 1s; }
.hero-media video.is-ready { opacity: 1; }
.hero-scrim { background: linear-gradient(90deg, rgba(8,11,12,.86) 0%, rgba(8,11,12,.58) 48%, rgba(8,11,12,.18) 100%), linear-gradient(0deg, rgba(8,11,12,.4), transparent 40%); }
.hero-home .hero-media { background: radial-gradient(circle at 80% 44%, rgba(99,210,205,.2), transparent 30%), radial-gradient(circle at 72% 72%, rgba(241,163,111,.11), transparent 22%), linear-gradient(125deg, #090c0d 0%, #161c1f 62%, #0e1214 100%); }
.hero-home .hero-media::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 49.9%, rgba(255,255,255,.06) 50%, transparent 50.1%), linear-gradient(0deg, transparent 49.9%, rgba(255,255,255,.04) 50%, transparent 50.1%); background-size: 180px 180px; mask-image: linear-gradient(90deg, transparent 38%, #000 70%); }
.hero-home .hero-media img { inset: 94px -2vw auto auto; width: min(66vw, 960px); height: calc(100% - 180px); object-fit: contain; object-position: right center; filter: drop-shadow(0 40px 65px rgba(0,0,0,.55)); }
.hero-home .hero-scrim { background: linear-gradient(90deg, rgba(7,10,11,.98) 0%, rgba(7,10,11,.9) 38%, rgba(7,10,11,.25) 70%, rgba(7,10,11,.06) 100%), linear-gradient(0deg, rgba(7,10,11,.52), transparent 42%); }
.hero-content { position: relative; z-index: 2; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding-top: 112px; padding-bottom: 132px; }
.eyebrow { display: flex; align-items: center; gap: 11px; margin: 0 0 24px; color: #4e565a; font-size: 12px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow span { width: 32px; height: 2px; background: var(--accent); }
.eyebrow.light { color: rgba(255,255,255,.72); }
.hero h1 { max-width: 850px; margin: 0; font-size: clamp(50px, 6.6vw, 102px); line-height: .98; letter-spacing: -.055em; font-weight: 500; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero-intro { max-width: 640px; margin: 30px 0 0; color: rgba(255,255,255,.76); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; gap: 12px; margin-top: 36px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 24px; border: 1px solid transparent; cursor: pointer; font-size: 14px; font-weight: 700; letter-spacing: .04em; transition: transform .2s, background .2s, color .2s, border .2s; }
.button:hover { transform: translateY(-2px); }
.button-accent { color: #0d1718; background: var(--accent); }
.button-accent:hover { background: #8be2de; }
.button-glass { color: #fff; border-color: rgba(255,255,255,.55); background: rgba(255,255,255,.05); backdrop-filter: blur(6px); }
.button-dark { color: #fff; background: var(--ink); }
.button-light { color: var(--ink); background: #fff; }
.button-outline { color: var(--ink); border-color: var(--ink); background: transparent; }
.hero-metrics { position: absolute; z-index: 3; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.17); }
.hero-metrics div { min-height: 100px; display: flex; flex-direction: column; justify-content: center; padding: 14px 26px; border-right: 1px solid rgba(255,255,255,.17); }
.hero-metrics strong { font-size: 24px; letter-spacing: -.02em; }
.hero-metrics strong sup { color: var(--accent); font-size: .58em; }
.hero-metrics span { margin-top: 4px; color: rgba(255,255,255,.58); font-size: 11px; letter-spacing: .08em; }
.hero-scroll { position: absolute; z-index: 4; right: 22px; bottom: 30px; display: grid; justify-items: center; gap: 9px; font-size: 8px; letter-spacing: .18em; transform: rotate(90deg); transform-origin: center; }
.hero-scroll span { width: 30px; height: 1px; background: currentColor; }

.section { padding: 120px 0; }
.split-head, .section-head { display: grid; grid-template-columns: 1.15fr .85fr; gap: 9vw; align-items: end; }
.split-head h2, .section-head h2, .manufacturing-copy h2, .quality-copy h2, .global-copy h2, .contact-strip h2, .page-hero h1 { margin: 0; font-size: clamp(36px, 4.2vw, 64px); line-height: 1.12; letter-spacing: -.045em; font-weight: 500; }
.lead-copy, .section-head > p { color: var(--muted); font-size: 16px; line-height: 1.9; }
.lead-copy > p, .section-head > p { margin: 0 0 28px; }
.text-link { display: inline-flex; align-items: center; gap: 14px; padding-bottom: 7px; border-bottom: 1px solid var(--ink); font-size: 13px; font-weight: 700; }
.text-link span { color: var(--accent); }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 78px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.value-grid article { min-height: 270px; padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.value-grid .index { color: var(--accent-warm); font-size: 11px; letter-spacing: .18em; }
.value-grid h3 { margin: 64px 0 12px; font-size: 24px; }
.value-grid p { margin: 0; color: var(--muted); line-height: 1.8; }

.dark-section { color: #fff; background: var(--ink); }
.section-head { margin-bottom: 58px; }
.section-head.inverse > p { color: rgba(255,255,255,.6); }
.category-grid { display: grid; grid-template-columns: 1.35fr .825fr .825fr; gap: 12px; }
.category-card { position: relative; min-height: 510px; overflow: hidden; background: #25292c; }
.category-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,8,10,.92), transparent 70%); }
.category-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.category-systems img { object-position: 43% center; }
.category-card:hover img { transform: scale(1.035); }
.category-card > div { position: absolute; z-index: 2; inset: auto 28px 28px; }
.category-card span { color: var(--accent); font-size: 10px; letter-spacing: .18em; }
.category-card h3 { margin: 10px 0; font-size: 26px; }
.category-card p { min-height: 48px; margin: 0 0 18px; color: rgba(255,255,255,.64); line-height: 1.7; }
.category-card strong { font-size: 12px; }

.model-showcase { display: grid; gap: 16px; }
.model-feature { min-height: 580px; display: grid; grid-template-columns: .8fr 1.2fr; overflow: hidden; background: linear-gradient(135deg, #f2f1ed, #e8e8e5); }
.model-copy { align-self: center; padding: clamp(36px, 5vw, 72px); }
.model-copy > span, .model-grid article span { color: #5f6669; font-size: 11px; font-weight: 700; letter-spacing: .15em; }
.model-copy h3 { margin: 10px 0 20px; font-size: clamp(48px, 6vw, 88px); line-height: 1; font-weight: 500; }
.model-copy p { max-width: 420px; margin: 0 0 28px; color: var(--muted); line-height: 1.8; }
.model-feature > img { width: 100%; height: 100%; object-fit: contain; padding: 22px; }
.model-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.model-grid article { min-height: 370px; display: grid; grid-template-columns: .85fr 1.15fr; overflow: hidden; background: #f3f3f0; }
.model-grid article > div { align-self: end; padding: 30px 0 30px 30px; }
.model-grid h3 { margin: 8px 0 12px; font-size: 30px; }
.model-grid p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.model-grid img { width: 100%; height: 100%; object-fit: contain; padding: 14px; }
.center-action { display: flex; justify-content: center; margin-top: 46px; }

.manufacturing-preview { padding: 0; color: #fff; background: #0e1113; }
.manufacturing-layout { width: min(100%, 1600px); display: grid; grid-template-columns: .8fr 1.2fr; }
.manufacturing-copy { align-self: center; padding: 100px max(28px, 6vw); }
.manufacturing-copy > p:not(.eyebrow) { max-width: 560px; color: rgba(255,255,255,.62); line-height: 1.9; }
.manufacturing-copy ul { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 36px 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.15); }
.manufacturing-copy li { padding: 16px 8px 16px 0; border-bottom: 1px solid rgba(255,255,255,.15); color: rgba(255,255,255,.78); font-size: 13px; }
.manufacturing-gallery { display: grid; grid-template-columns: 1fr 1fr; }
.manufacturing-gallery figure { position: relative; min-height: 330px; margin: 0; overflow: hidden; }
.manufacturing-gallery .gallery-main { grid-column: 1 / -1; min-height: 480px; }
.manufacturing-gallery img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.72); }
.manufacturing-gallery figcaption { position: absolute; inset: auto 18px 18px; display: flex; gap: 12px; padding: 9px 12px; background: rgba(8,10,11,.72); font-size: 12px; backdrop-filter: blur(8px); }
.manufacturing-gallery figcaption span { color: var(--accent); font-size: 9px; letter-spacing: .15em; }

.quality-layout { display: grid; grid-template-columns: 1.15fr .85fr; gap: 9vw; align-items: center; }
.quality-visual { position: relative; min-height: 570px; background: #f1f1ee; overflow: hidden; }
.certificate-stack { position: absolute; inset: 40px 14% 50px 9%; }
.certificate-stack img { position: absolute; width: 62%; max-height: 440px; object-fit: contain; background: #fff; box-shadow: 0 18px 55px rgba(10,15,17,.15); }
.certificate-stack img:last-child { right: 0; bottom: 0; }
.quality-mark { position: absolute; right: 0; top: 0; width: 180px; height: 180px; display: grid; place-content: center; color: #fff; background: var(--ink); }
.quality-mark strong { color: var(--accent); font-size: 52px; line-height: 1; }
.quality-mark span { margin-top: 8px; font-size: 11px; line-height: 1.5; }
.quality-copy > p:not(.eyebrow) { color: var(--muted); line-height: 1.9; }
.quality-badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 30px 0; }
.quality-badges span { padding: 10px 14px; border: 1px solid var(--line); font-size: 12px; font-weight: 700; }
.soft-section { background: var(--paper); }
.case-grid { display: grid; grid-template-columns: 1fr 1.25fr 1fr; gap: 14px; }
.case-grid a { position: relative; min-height: 470px; overflow: hidden; color: #fff; }
.case-grid img { width: 100%; height: 100%; object-fit: cover; transition: transform .55s; }
.case-grid a:hover img { transform: scale(1.035); }
.case-grid a::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,7,8,.82), transparent 58%); }
.case-grid a div { position: absolute; z-index: 2; inset: auto 24px 24px; display: grid; gap: 8px; }
.case-grid span { color: var(--accent); font-size: 10px; letter-spacing: .12em; }
.case-grid strong { font-size: 18px; }

.global-cta { min-height: 650px; display: grid; grid-template-columns: 1.05fr .95fr; color: #fff; background: #101315; }
.global-visual { min-height: 560px; overflow: hidden; }
.global-visual img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(.25) brightness(.65); }
.global-copy { align-self: center; padding: 78px max(28px, 7vw); }
.global-copy > p:not(.eyebrow) { max-width: 530px; color: rgba(255,255,255,.63); line-height: 1.9; }
.global-copy .button { margin-top: 20px; }
.market-list { display: flex; flex-wrap: wrap; gap: 12px 18px; margin-top: 40px; color: rgba(255,255,255,.42); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }
.contact-strip { padding: 88px 0; }
.contact-strip-inner { display: grid; grid-template-columns: 1fr auto; gap: 60px; align-items: end; }
.contact-options { display: grid; grid-template-columns: auto auto auto auto; gap: 26px; align-items: end; }
.contact-options > a:not(.button) { display: grid; gap: 6px; }
.contact-options span { color: var(--muted); font-size: 11px; }
.contact-options strong { font-size: 15px; }
.button-wechat { color: #fff; background: #087b4d; border-color: #087b4d; }
.button-wechat:hover { background: #076a43; border-color: #076a43; }

.site-footer { color: rgba(255,255,255,.64); background: #0c0f10; }
.footer-main { display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 60px; padding: 74px 0; }
.footer-brand img { width: 154px; height: auto; aspect-ratio: 32 / 5; object-fit: contain; margin-bottom: 24px; filter: brightness(0) invert(1); }
.footer-brand strong, .footer-main > div > strong { display: block; margin-bottom: 17px; color: #fff; font-size: 13px; }
.footer-brand p { font-size: 12px; }
.footer-main > div:not(.footer-brand) { display: flex; flex-direction: column; gap: 12px; font-size: 12px; }
.footer-main a:hover { color: var(--accent); }
.footer-bottom { min-height: 64px; display: flex; align-items: center; gap: 26px; border-top: 1px solid rgba(255,255,255,.1); font-size: 10px; }
.footer-bottom a { margin-left: auto; }

/* Interior pages */
.interior .site-header { color: var(--ink); background: rgba(255,255,255,.97); border-color: var(--line); }
.interior .brand img { filter: none; }
.page-hero { padding: 180px 0 100px; background: var(--paper); }
.page-hero .wrap { display: grid; grid-template-columns: 1.2fr .8fr; gap: 10vw; align-items: end; }
.page-hero p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.9; }
.page-hero .eyebrow { margin-bottom: 22px; }
.feature-banner { min-height: 520px; position: relative; overflow: hidden; color: #fff; background: #111; }
.feature-banner > img { position: absolute; width: 100%; height: 100%; object-fit: cover; }
.feature-banner::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(8,10,11,.86), rgba(8,10,11,.15)); }
.feature-banner .wrap { position: relative; z-index: 2; min-height: 520px; display: grid; align-content: center; }
.feature-banner h2 { max-width: 700px; margin: 0; font-size: clamp(38px,5vw,70px); line-height: 1.08; font-weight: 500; letter-spacing: -.04em; }
.content-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 9vw; }
.content-grid aside { color: var(--muted); font-size: 12px; letter-spacing: .12em; }
.content-grid article h2 { margin: 0 0 30px; font-size: clamp(32px,4vw,54px); line-height: 1.15; font-weight: 500; }
.content-grid article h3 { margin: 40px 0 12px; font-size: 22px; }
.content-grid article p, .content-grid article li { color: var(--muted); line-height: 1.9; }
.content-grid article ul { padding-left: 20px; }
.timeline { margin-top: 54px; border-top: 1px solid var(--line); }
.timeline div { display: grid; grid-template-columns: 130px 1fr; padding: 24px 0; border-bottom: 1px solid var(--line); }
.timeline strong { color: var(--accent-warm); }
.wide-card-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.wide-card-grid article { background: var(--paper); overflow: hidden; }
.wide-card-grid img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.wide-card-grid article div { padding: 26px; }
.wide-card-grid h3 { margin: 0 0 10px; font-size: 22px; }
.wide-card-grid p { color: var(--muted); line-height: 1.7; }
.product-listing { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
.product-listing article { display: flex; min-height: 430px; flex-direction: column; background: #f3f3f0; }
.product-listing img { width: 100%; height: 260px; object-fit: contain; padding: 18px; }
.product-listing article div { padding: 24px; }
.product-listing span { color: var(--accent-warm); font-size: 10px; letter-spacing: .12em; }
.product-listing h3 { margin: 9px 0; font-size: 27px; }
.product-listing p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.system-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }
.system-grid article { padding: 28px; border: 1px solid var(--line); }
.system-grid h3 { margin: 35px 0 10px; font-size: 19px; }
.system-grid p { color: var(--muted); font-size: 13px; line-height: 1.7; }
.contact-page-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 8vw; }
.contact-details { display: grid; gap: 14px; }
.contact-details > a, .contact-details > div { padding: 24px; border: 1px solid var(--line); }
.contact-details span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 11px; }
.wechat-contact-card { display: grid; grid-template-columns: 132px 1fr; gap: 22px; align-items: center; padding: 22px; color: #fff; background: var(--ink); }
.wechat-contact-card .wechat-card-qr { padding: 8px; background: #fff; }
.wechat-contact-card img { display: block; width: 100%; height: auto; }
.wechat-contact-card .wechat-card-copy { min-width: 0; }
.wechat-contact-card .wechat-card-copy > span { color: var(--accent); font-weight: 700; letter-spacing: .1em; }
.wechat-contact-card strong { display: block; margin: 8px 0; font-size: 18px; }
.wechat-contact-card p { margin: 0 0 8px; color: rgba(255,255,255,.68); font-size: 12px; line-height: 1.7; }
.wechat-contact-card small { color: rgba(255,255,255,.44); font-size: 10px; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 34px; background: var(--paper); }
.contact-form label { display: grid; gap: 8px; color: var(--muted); font-size: 12px; }
.contact-form label.full { grid-column: 1/-1; }
.contact-form input, .contact-form textarea, .contact-form select { width: 100%; padding: 14px 0; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; outline: 0; background: transparent; }
.contact-form input[type="checkbox"] { width: auto; margin: 0 8px 0 0; padding: 0; accent-color: var(--ink); }
.contact-form label > span { display: flex; align-items: flex-start; line-height: 1.6; }
.contact-form label > span a { text-decoration: underline; text-underline-offset: 3px; }
.contact-form textarea { min-height: 120px; resize: vertical; }
.contact-form button { grid-column: 1/-1; justify-self: start; }
.policy { max-width: 860px; }
.policy h2 { margin-top: 44px; }
.policy p, .policy li { color: var(--muted); line-height: 1.9; }

/* Knowledge center and answer pages */
.knowledge-hero { background: linear-gradient(135deg, #eef3f1 0%, #f7f6f2 58%, #eef1f0 100%); }
.knowledge-hero .answer-lead { max-width: 590px; padding-left: 28px; border-left: 3px solid var(--accent); color: var(--ink); font-size: 18px; line-height: 1.85; }
.knowledge-visual { color: #fff; background: var(--ink); }
.knowledge-visual .wrap { min-height: 540px; display: grid; grid-template-columns: 1.25fr .75fr; align-items: stretch; }
.knowledge-visual img { width: 100%; height: 100%; min-height: 540px; object-fit: cover; }
.knowledge-visual .wrap > div { display: grid; align-content: end; gap: 14px; padding: clamp(34px, 5vw, 72px); background: #123a36; }
.knowledge-visual strong { color: var(--accent); font-size: 11px; letter-spacing: .16em; }
.knowledge-visual p { margin: 0; color: rgba(255,255,255,.76); font-size: 17px; line-height: 1.85; }
.knowledge-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.knowledge-card { min-height: 310px; display: flex; flex-direction: column; padding: 34px; border: 1px solid var(--line); background: #fff; transition: border-color .25s, transform .25s, box-shadow .25s; }
.knowledge-card:hover { border-color: rgba(0,133,121,.52); box-shadow: 0 18px 45px rgba(9,32,31,.08); transform: translateY(-3px); }
.knowledge-card > span { color: var(--accent); font-size: 12px; font-weight: 800; }
.knowledge-card h2 { margin: 30px 0 14px; font-size: 27px; line-height: 1.28; }
.knowledge-card p { margin: 0 0 28px; color: var(--muted); line-height: 1.75; }
.knowledge-card strong { margin-top: auto; font-size: 12px; }
.answer-steps { border-top: 1px solid var(--line); }
.answer-step { display: grid; grid-template-columns: 90px minmax(0, 1fr); gap: 44px; padding: 42px 0; border-bottom: 1px solid var(--line); }
.answer-step > span { color: var(--accent-warm); font-size: 13px; font-weight: 800; }
.answer-step h2 { margin: 0 0 14px; font-size: 32px; }
.answer-step p { max-width: 850px; margin: 0; color: var(--muted); line-height: 1.9; }
.faq-stack { border-top: 1px solid var(--line); }
.faq-stack details { border-bottom: 1px solid var(--line); }
.faq-stack summary { position: relative; padding: 25px 52px 25px 0; font-size: 18px; font-weight: 700; cursor: pointer; list-style: none; }
.faq-stack summary::-webkit-details-marker { display: none; }
.faq-stack summary::after { content: "+"; position: absolute; right: 4px; top: 19px; color: var(--accent); font-size: 28px; font-weight: 400; }
.faq-stack details[open] summary::after { content: "−"; }
.faq-stack details p { max-width: 900px; margin: 0; padding: 0 52px 28px 0; color: var(--muted); line-height: 1.85; }
.editorial-note { padding: 32px 36px; border-left: 4px solid var(--accent); background: #eef3f1; }
.editorial-note h2 { margin: 0 0 14px; font-size: 25px; }
.editorial-note p { margin: 0; color: var(--muted); line-height: 1.85; }
.editorial-note p + p { margin-top: 14px; }
.related-answers { padding-top: 30px; }
.related-link-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.related-link-grid a { min-height: 112px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 24px; border: 1px solid var(--line); font-weight: 700; }
.related-link-grid a:hover { color: var(--accent); border-color: var(--accent); }
.related-link-grid span { color: var(--accent); font-size: 22px; }
.fact-table { margin: 0; border-top: 1px solid var(--line); }
.fact-table > div { display: grid; grid-template-columns: minmax(150px, .32fr) minmax(0, 1fr); gap: 38px; padding: 25px 0; border-bottom: 1px solid var(--line); }
.fact-table dt { color: var(--ink); font-weight: 800; }
.fact-table dd { margin: 0; color: var(--muted); line-height: 1.85; }
.reference-list { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
.reference-list a { padding: 10px 14px; border: 1px solid rgba(0,133,121,.28); background: #fff; color: var(--ink); font-size: 12px; font-weight: 700; }
.reference-list a:hover { color: var(--accent); border-color: var(--accent); }
.source-disclaimer { margin-top: 28px !important; padding: 20px 22px; border-left: 3px solid var(--accent-warm); background: var(--paper); font-size: 13px; }

/* WeChat consultation */
.wechat-consult { position: fixed; z-index: 90; right: 24px; bottom: 24px; display: grid; justify-items: end; }
.wechat-fab { min-height: 48px; display: inline-flex; align-items: center; gap: 10px; padding: 0 18px; color: #fff; border: 1px solid rgba(255,255,255,.12); background: #0c0f10; box-shadow: 0 12px 32px rgba(5,8,9,.22); font: inherit; font-size: 12px; font-weight: 700; letter-spacing: .04em; cursor: pointer; }
.wechat-fab:hover, .wechat-fab[aria-expanded="true"] { background: #151a1c; }
.wechat-fab-dot { width: 10px; height: 10px; border-radius: 50%; background: #07c160; box-shadow: 0 0 0 4px rgba(7,193,96,.15); }
.wechat-popover { position: absolute; right: 0; bottom: calc(100% + 14px); width: 286px; padding: 26px; color: var(--ink); border: 1px solid var(--line); background: #fff; box-shadow: 0 22px 60px rgba(7,12,14,.2); text-align: center; }
.wechat-popover[hidden] { display: none; }
.wechat-popover::after { content: ""; position: absolute; right: 28px; bottom: -7px; width: 12px; height: 12px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; transform: rotate(45deg); }
.wechat-popover-close { position: absolute; top: 9px; right: 10px; width: 32px; height: 32px; display: grid; place-items: center; padding: 0; color: var(--muted); border: 0; background: transparent; font-size: 23px; line-height: 1; cursor: pointer; }
.wechat-kicker { display: block; margin-bottom: 7px; color: #087b4d; font-size: 9px; font-weight: 800; letter-spacing: .2em; }
.wechat-popover > strong { display: block; font-size: 17px; }
.wechat-qr-frame { width: 190px; margin: 18px auto 14px; padding: 12px; border: 1px solid var(--line); background: #fff; }
.wechat-qr-frame img { display: block; width: 100%; height: auto; }
.wechat-popover p { margin: 0; color: var(--ink); font-size: 13px; font-weight: 700; line-height: 1.7; }
.wechat-popover small { display: block; margin-top: 7px; color: var(--muted); font-size: 10px; }

@media (max-width: 1120px) {
  .site-header { grid-template-columns: auto 1fr auto; }
  .main-nav { gap: 13px; }
  .header-contact { display: none; }
  .category-grid { grid-template-columns: 1fr 1fr; }
  .category-primary { grid-column: 1/-1; min-height: 560px; }
  .contact-strip-inner { grid-template-columns: 1fr; }
  .contact-options { grid-template-columns: auto auto; justify-content: start; }
}

@media (max-width: 900px) {
  .wrap { width: min(calc(100% - 36px), var(--max)); }
  .site-header { height: 70px; padding: 0 18px; grid-template-columns: 1fr auto auto; }
  .brand img { width: 80px; }
  .brand span { display: none; }
  .nav-toggle { display: block; order: 3; }
  .global-trigger { padding: 8px 10px; }
  .main-nav { position: fixed; inset: 70px 0 0; height: auto; display: none; align-content: start; padding: 28px; color: var(--ink); background: #fff; }
  .main-nav.is-open { display: grid; }
  .main-nav a { min-height: 52px; place-items: center start; border-bottom: 1px solid var(--line); font-size: 16px; }
  .main-nav a::after { display: none; }
  .language-panel { top: 70px; right: 0; width: 100%; max-height: calc(100vh - 70px); grid-template-columns: 1fr 1fr; }
  .hero-content { padding-top: 100px; }
  .hero h1 { font-size: clamp(48px, 11vw, 76px); }
  .hero-intro { max-width: 570px; font-size: 15px; }
  .hero-metrics { grid-template-columns: 1fr 1fr; }
  .hero-metrics div { min-height: 72px; padding: 10px 16px; }
  .hero-metrics strong { font-size: 18px; }
  .hero-scroll { display: none; }
  .section { padding: 88px 0; }
  .split-head, .section-head, .quality-layout, .page-hero .wrap, .content-grid, .contact-page-grid { grid-template-columns: 1fr; gap: 38px; }
  .value-grid { grid-template-columns: 1fr; }
  .value-grid article { min-height: auto; }
  .value-grid h3 { margin-top: 32px; }
  .model-feature { grid-template-columns: 1fr; }
  .model-feature > img { max-height: 460px; order: -1; }
  .model-grid article { min-height: 330px; }
  .manufacturing-layout, .global-cta { grid-template-columns: 1fr; }
  .manufacturing-gallery { order: -1; }
  .global-visual { min-height: 420px; }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .case-grid a:last-child { grid-column: 1/-1; }
  .footer-main { grid-template-columns: 1.6fr 1fr 1fr; }
  .footer-main > div:last-child { grid-column: 2/4; }
  .wide-card-grid, .product-listing { grid-template-columns: 1fr 1fr; }
  .system-grid { grid-template-columns: 1fr 1fr; }
  .knowledge-grid { grid-template-columns: 1fr 1fr; }
  .knowledge-visual .wrap { grid-template-columns: 1fr; }
  .knowledge-visual img { min-height: 420px; }
  .related-link-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .language-panel { grid-template-columns: 1fr; padding: 14px; }
  .hero { min-height: 820px; }
  .hero-home .hero-media img { inset: 280px -32vw auto auto; width: 135vw; height: 470px; opacity: .64; }
  .hero-home .hero-scrim { background: linear-gradient(180deg, rgba(7,10,11,.98) 0%, rgba(7,10,11,.72) 56%, rgba(7,10,11,.9) 100%); }
  .hero-content { min-height: 820px; justify-content: flex-start; padding-top: 160px; padding-bottom: 190px; }
  .hero h1 { font-size: 49px; line-height: 1.03; }
  .hero-intro { font-size: 14px; line-height: 1.75; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-metrics strong { font-size: 16px; }
  .hero-metrics span { font-size: 9px; }
  .section { padding: 72px 0; }
  .split-head h2, .section-head h2, .manufacturing-copy h2, .quality-copy h2, .global-copy h2, .contact-strip h2, .page-hero h1 { font-size: 38px; }
  .value-grid { margin-top: 48px; }
  .category-grid, .model-grid, .case-grid, .wide-card-grid, .product-listing, .system-grid { grid-template-columns: 1fr; }
  .category-primary, .case-grid a:last-child { grid-column: auto; }
  .category-card, .category-primary { min-height: 430px; }
  .model-feature { min-height: auto; }
  .model-feature > img { height: 330px; }
  .model-grid article { min-height: 360px; grid-template-columns: 1fr 1.25fr; }
  .model-grid article > div { padding: 22px 0 22px 20px; }
  .model-grid h3 { font-size: 25px; }
  .manufacturing-copy, .global-copy { padding: 68px 24px; }
  .manufacturing-copy ul { grid-template-columns: 1fr; }
  .manufacturing-gallery .gallery-main { min-height: 330px; }
  .manufacturing-gallery figure { min-height: 240px; }
  .quality-visual { min-height: 440px; }
  .quality-mark { width: 130px; height: 130px; }
  .quality-mark strong { font-size: 38px; }
  .case-grid a { min-height: 400px; }
  .contact-options { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 40px 24px; }
  .footer-brand { grid-column: 1/-1; }
  .footer-main > div:last-child { grid-column: auto; }
  .footer-bottom { flex-wrap: wrap; gap: 8px 18px; padding: 16px 0; }
  .footer-bottom a { margin-left: 0; }
  .page-hero { padding: 130px 0 70px; }
  .knowledge-hero .answer-lead { padding-left: 20px; font-size: 15px; }
  .knowledge-grid { grid-template-columns: 1fr; }
  .knowledge-card { min-height: 250px; padding: 28px; }
  .knowledge-card h2 { font-size: 24px; }
  .knowledge-visual .wrap { width: 100%; }
  .knowledge-visual img { min-height: 300px; }
  .knowledge-visual .wrap > div { padding: 30px 24px; }
  .knowledge-visual p { font-size: 15px; }
  .answer-step { grid-template-columns: 1fr; gap: 12px; padding: 32px 0; }
  .answer-step h2 { font-size: 26px; }
  .faq-stack summary { padding-right: 38px; font-size: 16px; }
  .faq-stack details p { padding-right: 0; }
  .editorial-note { padding: 26px 22px; }
  .fact-table > div { grid-template-columns: 1fr; gap: 8px; padding: 22px 0; }
  .feature-banner, .feature-banner .wrap { min-height: 430px; }
  .timeline div { grid-template-columns: 90px 1fr; }
  .contact-form { grid-template-columns: 1fr; padding: 22px; }
  .contact-form label.full, .contact-form button { grid-column: 1; }
  .wechat-contact-card { grid-template-columns: 112px 1fr; gap: 16px; padding: 18px; }
  .wechat-consult { right: 14px; bottom: max(14px, env(safe-area-inset-bottom)); }
  .wechat-popover { position: fixed; right: 14px; bottom: calc(76px + env(safe-area-inset-bottom)); width: min(286px, calc(100vw - 28px)); }
  .wechat-fab { min-height: 46px; padding: 0 15px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .hero-media video { display: none; }
}