:root {
  --navy: #082f4f;
  --navy-deep: #05243c;
  --blue: #0b72b9;
  --cyan: #17a8c9;
  --gold: #d6a738;
  --ink: #15212b;
  --muted: #61717e;
  --line: #d9e2e8;
  --mist: #f1f5f7;
  --white: #ffffff;
  --max: 1180px;
  --header: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header); }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; line-height: 1.65; }
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

.skip-link { position: fixed; left: 12px; top: -60px; z-index: 100; background: var(--white); color: var(--navy); padding: 10px 14px; }
.skip-link:focus { top: 12px; }

.site-header { position: fixed; inset: 0 0 auto; height: var(--header); z-index: 50; color: var(--white); background: rgba(5, 36, 60, .94); border-bottom: 1px solid rgba(255,255,255,.16); backdrop-filter: blur(12px); }
.header-inner, .section-inner, .footer-inner { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; min-width: 0; }
.brand-mark { display: grid; place-items: center; width: 50px; height: 34px; border-left: 5px solid var(--cyan); color: var(--white); font-weight: 800; letter-spacing: 1px; }
.brand-copy { display: flex; flex-direction: column; min-width: 0; line-height: 1.28; }
.brand-copy strong { font-size: 16px; font-weight: 700; }
.brand-copy small { font-size: 10px; color: #b8d1df; white-space: nowrap; }
.site-nav { display: flex; align-items: center; gap: 27px; }
.site-nav a { position: relative; text-decoration: none; font-size: 14px; color: #e6f0f5; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -9px; height: 2px; background: var(--cyan); transition: right .2s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-button { display: none; }
.icon-button { width: 42px; height: 42px; border: 1px solid rgba(255,255,255,.28); background: transparent; color: white; padding: 9px; cursor: pointer; }
.icon-button svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }

.hero { position: relative; min-height: min(820px, 100vh); color: var(--white); display: flex; align-items: flex-end; overflow: hidden; }
.hero-image, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-image { object-fit: cover; object-position: center 54%; transform: scale(1.015); }
.hero-shade { background: rgba(3, 26, 44, .68); }
.hero-inner { position: relative; width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: 178px 0 65px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 80px; }
.hero-copy { max-width: 820px; }
.eyebrow { margin: 0 0 15px; color: var(--cyan); font-size: 12px; font-weight: 800; letter-spacing: 2px; }
.hero h1 { margin: 0; max-width: 820px; font-size: clamp(42px, 4.6vw, 64px); line-height: 1.12; letter-spacing: 0; font-weight: 750; }
.hero-subtitle { margin: 22px 0 0; font-size: clamp(19px, 2vw, 27px); color: #dcecf4; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 24px; border: 1px solid transparent; text-decoration: none; font-weight: 700; font-size: 14px; transition: transform .18s ease, background .18s ease, color .18s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--blue); color: var(--white); }
.button-primary:hover { background: #095f9a; }
.button-outline { border-color: rgba(255,255,255,.58); color: var(--white); background: rgba(0,0,0,.08); }
.button-outline:hover { background: var(--white); color: var(--navy); }
.hero-facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid rgba(255,255,255,.35); max-width: 900px; }
.hero-facts div { padding: 24px 24px 0 0; }
.hero-facts strong, .hero-facts span { display: block; }
.hero-facts strong { font-size: 27px; color: var(--white); }
.hero-facts span { font-size: 12px; color: #bed1dc; }
.concept-note { position: absolute; right: 24px; bottom: 14px; margin: 0; font-size: 11px; color: rgba(255,255,255,.72); }

.section { padding: 100px 0; }
.section-heading h2 { margin: 0; max-width: 780px; color: var(--navy-deep); font-size: clamp(31px, 3.6vw, 48px); line-height: 1.25; letter-spacing: 0; }
.heading-row { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(260px, .72fr); align-items: end; gap: 60px; margin-bottom: 52px; }
.heading-row > p { margin: 0 0 4px; color: var(--muted); font-size: 15px; }

.about { background: var(--white); }
.about-grid { display: grid; grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr); gap: 36px 70px; align-items: start; }
.about-copy { padding-top: 7px; }
.about-copy p { color: var(--muted); margin: 0 0 20px; }
.about-copy .lead { color: var(--ink); font-size: 20px; line-height: 1.75; }
.cert-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.cert-list span { padding: 6px 10px; border-left: 3px solid var(--blue); background: var(--mist); color: var(--navy); font-size: 12px; font-weight: 700; }
.photo-frame { margin: 12px 0 0; position: relative; overflow: hidden; min-height: 310px; }
.photo-frame img { width: 100%; height: 100%; min-height: 310px; object-fit: cover; }
.photo-frame figcaption { position: absolute; left: 0; bottom: 0; padding: 10px 15px; color: var(--white); background: rgba(5,36,60,.85); font-size: 12px; }
.location-strip { display: grid; grid-template-columns: repeat(3, 1fr); align-self: stretch; margin-top: 12px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.location-strip div { padding: 27px 22px; border-right: 1px solid var(--line); }
.location-strip div:last-child { border-right: 0; }
.location-strip span, .location-strip strong { display: block; }
.location-strip span { color: var(--muted); font-size: 12px; }
.location-strip strong { margin-top: 4px; color: var(--navy); font-size: 17px; }

.credentials { background: var(--mist); }
.credential-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.credential-card { display: grid; grid-template-columns: minmax(0, .86fr) minmax(220px, .74fr); min-height: 420px; border: 1px solid var(--line); background: var(--white); }
.credential-preview { display: grid; place-items: center; min-height: 420px; padding: 20px; background: #f8fafb; border-right: 1px solid var(--line); }
.credential-preview img { width: 100%; height: 100%; max-height: 380px; object-fit: contain; }
.credential-copy { display: flex; flex-direction: column; justify-content: center; padding: 34px 28px; }
.credential-kicker { margin: 0 0 10px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: 1.4px; }
.credential-copy h3 { margin: 0; color: var(--navy); font-size: 26px; line-height: 1.35; }
.credential-copy > p:not(.credential-kicker) { margin: 16px 0 25px; color: var(--muted); font-size: 14px; }
.credential-link { align-self: flex-start; color: var(--navy); font-weight: 700; font-size: 14px; text-decoration-color: var(--cyan); text-underline-offset: 6px; }
.credential-card-text { grid-template-columns: minmax(0, .9fr) minmax(220px, 1.1fr); }
.credential-card-text .credential-copy { order: 1; }
.credential-card-image { width: 100%; height: 100%; min-height: 420px; object-fit: cover; border-left: 1px solid var(--line); }

.products { background: var(--mist); }
.product-tabs { display: flex; flex-wrap: wrap; border-bottom: 1px solid #becdd6; margin-bottom: 34px; }
.product-tab { position: relative; flex: 1 1 190px; min-height: 54px; border: 0; background: transparent; color: var(--muted); cursor: pointer; padding: 10px 14px; }
.product-tab::after { content: ""; position: absolute; height: 3px; left: 50%; right: 50%; bottom: -1px; background: var(--blue); transition: left .2s ease, right .2s ease; }
.product-tab.is-active { color: var(--navy); font-weight: 700; }
.product-tab.is-active::after { left: 0; right: 0; }
.product-stage { display: grid; grid-template-columns: .78fr 1.22fr; min-height: 470px; background: var(--white); box-shadow: 0 18px 45px rgba(7,47,79,.08); }
.product-summary { padding: 54px 46px; border-left: 5px solid var(--blue); }
.product-index { color: var(--cyan); font-size: 13px; font-weight: 800; }
.product-summary h3 { margin: 13px 0 18px; color: var(--navy); font-size: 31px; line-height: 1.3; }
.product-summary p { color: var(--muted); }
.product-summary ul { margin: 28px 0 0; padding: 0; list-style: none; }
.product-summary li { position: relative; padding: 10px 0 10px 24px; border-top: 1px solid var(--line); font-size: 14px; }
.product-summary li::before { content: ""; position: absolute; left: 2px; top: 18px; width: 8px; height: 8px; background: var(--cyan); }
.product-visual { position: relative; min-height: 470px; overflow: hidden; background: #e9eef1; }
.product-visual img { width: 100%; height: 100%; min-height: 470px; object-fit: cover; transition: opacity .18s ease; }
.product-visual img.product-contain { object-fit: contain; padding: 30px; }

.capabilities { background: var(--white); }
.capability-bands { border-top: 1px solid var(--line); }
.capability-band { display: grid; grid-template-columns: .8fr 1.2fr; gap: 54px; align-items: center; padding: 42px 0; border-bottom: 1px solid var(--line); }
.capability-band-reverse { grid-template-columns: 1.2fr .8fr; }
.capability-band-reverse .capability-copy { order: 2; }
.capability-copy span { color: var(--blue); font-size: 12px; font-weight: 800; }
.capability-copy h3 { margin: 8px 0 13px; color: var(--navy); font-size: 29px; }
.capability-copy p { margin: 0; color: var(--muted); }
.capability-band img { width: 100%; height: 300px; object-fit: cover; }

.factory { color: var(--white); background: var(--navy-deep); }
.factory .section-heading h2 { color: var(--white); }
.factory-intro { display: grid; grid-template-columns: 1fr .68fr; gap: 70px; align-items: end; }
.factory-intro > p { margin: 0; color: #c1d3de; }
.factory-single { margin: 52px auto 0; max-width: 900px; }
.factory-single > img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #0a314d; }
.factory-single figcaption { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 25px; align-items: start; padding: 24px 0; border-bottom: 1px solid rgba(255,255,255,.28); }
.factory-single figcaption span { color: var(--gold); font-size: 12px; font-weight: 800; }
.factory-single address { color: var(--white); font-style: normal; font-size: 17px; line-height: 1.65; }
.factory-disclaimer { max-width: 900px; margin: 14px auto 0; color: #9db5c4; font-size: 12px; }

.strengths { background: var(--mist); }
.strength-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 48px; border-top: 1px solid #cbd7de; border-bottom: 1px solid #cbd7de; }
.strength-grid article { padding: 32px 27px; border-right: 1px solid #cbd7de; }
.strength-grid article:last-child { border-right: 0; }
.strength-grid span { color: var(--cyan); font-size: 12px; font-weight: 800; }
.strength-grid h3 { margin: 15px 0 9px; color: var(--navy); font-size: 20px; }
.strength-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.contact { background: var(--white); }
.contact-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 80px; }
.contact-intro h2 { margin: 0; color: var(--navy); font-size: clamp(36px, 4vw, 52px); }
.contact-intro p:not(.eyebrow) { color: var(--muted); margin: 18px 0 30px; }
.contact-details { font-style: normal; border-top: 3px solid var(--blue); }
.contact-details > div { padding: 24px 0; border-bottom: 1px solid var(--line); }
.contact-details span, .contact-details strong { display: block; }
.contact-details span { color: var(--blue); font-size: 12px; font-weight: 700; }
.contact-details strong { margin-top: 8px; font-size: 16px; line-height: 1.65; }
.contact-lines { display: flex; flex-wrap: wrap; gap: 15px 27px; }
.contact-lines a, .contact-lines span { color: var(--navy); text-decoration-color: #a6bbc8; text-underline-offset: 5px; }

.site-footer { color: #bcd0dc; background: #031b2c; }
.footer-inner { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; font-size: 12px; }
.footer-inner a { color: var(--white); text-decoration: none; }

:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

@media (max-width: 900px) {
  :root { --header: 68px; }
  .header-inner, .section-inner, .footer-inner, .hero-inner { width: min(calc(100% - 32px), var(--max)); }
  .menu-button { display: block; }
  .site-nav { display: none; position: fixed; inset: var(--header) 0 auto; padding: 18px 22px 28px; background: var(--navy-deep); border-top: 1px solid rgba(255,255,255,.15); flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 13px 2px; border-bottom: 1px solid rgba(255,255,255,.1); }
  .site-nav a::after { display: none; }
  .hero { min-height: 760px; }
  .hero-inner { padding-top: 150px; }
  .hero-facts { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 76px 0; }
  .heading-row, .about-grid, .factory-intro, .contact-grid, .credential-grid { grid-template-columns: 1fr; gap: 28px; }
  .heading-row { margin-bottom: 38px; }
  .location-strip { grid-template-columns: 1fr; }
  .location-strip div { border-right: 0; border-bottom: 1px solid var(--line); }
  .location-strip div:last-child { border-bottom: 0; }
  .product-stage { grid-template-columns: 1fr; }
  .product-summary { padding: 38px 30px; }
  .product-visual, .product-visual img { min-height: 360px; }
  .capability-band, .capability-band-reverse { grid-template-columns: 1fr; gap: 22px; }
  .capability-band-reverse .capability-copy { order: 0; }
  .credential-card { grid-template-columns: minmax(300px, .9fr) minmax(260px, .7fr); }
  .credential-card-text { grid-template-columns: minmax(260px, .9fr) minmax(300px, 1.1fr); }
  .strength-grid article:nth-child(2) { border-right: 0; }
  .strength-grid article:nth-child(-n+2) { border-bottom: 1px solid #cbd7de; }
}

@media (max-width: 600px) {
  .brand-copy small { display: none; }
  .hero { min-height: 720px; }
  .hero-image { object-position: center 48%; }
  .hero-shade { background: rgba(3, 26, 44, .74); }
  .hero-inner { padding: 130px 0 48px; gap: 52px; }
  .hero h1 { font-size: 39px; }
  .hero-facts div { padding-right: 12px; }
  .hero-facts strong { font-size: 23px; }
  .concept-note { right: 16px; bottom: 8px; }
  .section { padding: 62px 0; }
  .section-heading h2 { font-size: 31px; }
  .about-copy .lead { font-size: 18px; }
  .product-tabs { display: grid; grid-template-columns: repeat(2, 1fr); }
  .product-tab { min-width: 0; }
  .product-summary h3 { font-size: 26px; }
  .product-visual, .product-visual img { min-height: 290px; }
  .capability-band img { height: 230px; }
  .credential-card { grid-template-columns: 1fr; min-height: 0; }
  .credential-preview { min-height: 320px; border-right: 0; border-bottom: 1px solid var(--line); }
  .credential-card-image { min-height: 260px; max-height: 300px; border-left: 0; border-top: 1px solid var(--line); }
  .factory-single { margin-top: 35px; }
  .factory-single figcaption { grid-template-columns: 1fr; gap: 7px; padding: 18px 0; }
  .factory-single address { font-size: 15px; }
  .strength-grid { grid-template-columns: 1fr; }
  .strength-grid article, .strength-grid article:nth-child(2) { border-right: 0; border-bottom: 1px solid #cbd7de; }
  .strength-grid article:last-child { border-bottom: 0; }
  .contact-grid { gap: 46px; }
  .footer-inner { padding: 20px 0; flex-direction: column; align-items: flex-start; gap: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}