:root {
  --teal: #08a892;
  --teal-dark: #057f70;
  --teal-pale: #e9f8f5;
  --navy: #071b2a;
  --navy-2: #0b2738;
  --ink: #10212d;
  --muted: #62717a;
  --line: #dce4e7;
  --paper: #f5f8f8;
  --white: #fff;
  --shell: min(1180px, calc(100% - 48px));
  --shadow: 0 24px 60px rgba(10, 38, 49, .11);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; font-size: 16px; line-height: 1.7; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
img { display: block; max-width: 100%; }
.shell { width: var(--shell); margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 1000; transform: translateY(-150%); background: #fff; padding: 9px 14px; border-radius: 4px; }
.skip-link:focus { transform: none; }

.site-header { position: sticky; top: 0; z-index: 80; background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(12,52,66,.08); backdrop-filter: blur(14px); }
.topline { background: var(--navy); color: #b8c7ce; font-size: .78rem; letter-spacing: .02em; }
.topline-inner { display: flex; align-items: center; justify-content: space-between; min-height: 30px; }
.top-contact { display: flex; gap: 10px; align-items: center; }
.top-contact a:hover { color: #fff; }
.nav-wrap { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: flex; align-items: center; gap: 16px; min-width: 320px; }
.brand img { width: 96px; height: auto; }
.brand-copy { padding-left: 16px; border-left: 1px solid var(--line); display: flex; flex-direction: column; line-height: 1.35; }
.brand-copy strong { font-size: .9rem; font-weight: 700; }
.brand-copy small { font-size: .56rem; letter-spacing: .08em; color: #87939a; }
.desktop-nav { display: flex; align-items: center; gap: 28px; margin-left: auto; }
.desktop-nav a { position: relative; font-size: .92rem; font-weight: 700; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -10px; height: 2px; background: var(--teal); transition: right .25s ease; }
.desktop-nav a:hover::after { right: 0; }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.lang-toggle { border: 1px solid var(--line); color: var(--teal-dark); background: white; height: 36px; min-width: 44px; border-radius: 3px; font-weight: 800; cursor: pointer; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 0; background: transparent; padding: 9px; cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: var(--navy); transition: .2s; }
.mobile-nav { display: none; }

.hero { position: relative; min-height: 680px; overflow: hidden; background: #fff; }
.hero-grid { display: none; }
.hero-inner { position: relative; display: grid; grid-template-columns: 43% 57%; min-height: 680px; align-items: center; }
.hero-copy { padding: 70px 0 96px; z-index: 2; }
.eyebrow { display: flex; align-items: center; gap: 12px; color: var(--teal-dark); font-size: .76rem; letter-spacing: .18em; }
.eyebrow span { width: 26px; height: 2px; background: var(--teal); }
.eyebrow b { font-weight: 800; }
.hero h1 { margin: 22px 0 24px; font-family: "Microsoft YaHei", sans-serif; font-size: clamp(3.35rem, 5.3vw, 5.1rem); line-height: 1.08; letter-spacing: -.055em; }
.hero h1 em { color: var(--teal); font-style: normal; }
.hero-copy > p { max-width: 570px; margin: 0; color: var(--muted); font-size: 1.03rem; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; }
.button { min-height: 52px; padding: 0 24px; display: inline-flex; align-items: center; justify-content: center; gap: 30px; border: 1px solid transparent; font-size: .92rem; font-weight: 800; transition: transform .2s, background .2s, color .2s; }
.button:hover { transform: translateY(-2px); }
.button svg { width: 19px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.button.primary { background: var(--teal); color: white; box-shadow: 0 13px 26px rgba(8,168,146,.23); }
.button.primary:hover { background: var(--teal-dark); }
.button.ghost { color: var(--navy); border-color: #b8c7ca; background: rgba(255,255,255,.45); }
.hero-meta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; max-width: 600px; margin-top: 54px; }
.hero-meta div { padding-left: 12px; border-left: 2px solid var(--teal); }
.hero-meta strong, .hero-meta span { display: block; }
.hero-meta strong { font-size: .82rem; letter-spacing: .08em; }
.hero-meta span { margin-top: 2px; color: #7c898f; font-size: .73rem; }
.hero-visual { position: relative; align-self: stretch; display: flex; align-items: center; justify-content: center; }
.product-stage { width: min(720px, 100%); position: relative; filter: drop-shadow(0 30px 32px rgba(12,50,60,.18)); transform: translate(5%, 2%); }
.product-stage img { width: 100%; mix-blend-mode: multiply; }
.hero-label { position: absolute; z-index: 3; top: 68px; right: 14px; display: flex; align-items: center; gap: 10px; color: var(--navy); writing-mode: vertical-rl; }
.hero-label span { color: var(--teal); font-size: .7rem; font-weight: 800; }
.hero-label p { margin: 0; font-size: .7rem; letter-spacing: .18em; }
.stage-mark { display: none; }
.scroll-cue { position: absolute; left: 38px; bottom: 26px; display: flex; align-items: center; gap: 12px; color: #819097; font-size: .68rem; letter-spacing: .16em; writing-mode: vertical-rl; }
.scroll-cue span { width: 1px; height: 42px; background: var(--teal); }

.category-strip { background: var(--navy); color: white; }
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.category-grid a { min-height: 108px; padding: 22px 26px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; border-right: 1px solid rgba(255,255,255,.1); transition: background .2s; }
.category-grid a:first-child { border-left: 1px solid rgba(255,255,255,.1); }
.category-grid a:hover { background: var(--teal); }
.category-grid span { color: #64d8c9; font-size: .66rem; }
.category-grid b { font-size: .91rem; }
.category-grid i { font-style: normal; font-size: 1.2rem; font-weight: 300; }

.section { padding: 112px 0; }
.products-section { background: #fff; }
.section-head { display: grid; grid-template-columns: 1.25fr .75fr; align-items: end; gap: 60px; margin-bottom: 54px; }
.section-head h2, .about-copy h2, .contact-heading h2 { margin: 18px 0 0; font-size: clamp(2.2rem, 4vw, 3.5rem); line-height: 1.23; letter-spacing: -.04em; }
.section-head > p { margin: 0; color: var(--muted); padding-bottom: 8px; }
.eyebrow.dark { color: var(--teal-dark); }
.eyebrow.light { color: #82ded1; }
.product-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.product-card { min-height: 550px; background: var(--paper); border: 1px solid #edf1f2; overflow: hidden; position: relative; }
.product-image { height: 350px; display: flex; align-items: center; justify-content: center; padding: 8px 14px; background: linear-gradient(135deg, #f7fafa, #edf3f3); overflow: hidden; }
.product-image img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; transform: scale(1.28); transition: transform .5s ease; }
.product-image.dark-image img { mix-blend-mode: normal; }
.product-card:hover .product-image img { transform: scale(1.34); }
.product-info { padding: 28px 32px 32px; position: relative; }
.product-info .series { color: var(--teal-dark); font-size: .69rem; font-weight: 800; letter-spacing: .16em; }
.product-info h3 { margin: 7px 0 7px; font-size: 1.28rem; }
.product-info p { margin: 0; max-width: 75%; color: var(--muted); font-size: .88rem; }
.product-info a { position: absolute; right: 28px; bottom: 30px; display: inline-flex; gap: 8px; align-items: center; color: var(--teal-dark); font-size: .82rem; font-weight: 800; }
.product-info a i { font-style: normal; }

.about-section { padding: 0; background: var(--navy); color: white; }
.about-grid { min-height: 650px; display: grid; grid-template-columns: 42% 58%; }
.about-visual { position: relative; display: flex; flex-direction: column; justify-content: center; padding: 60px 50px 60px 10px; border-right: 1px solid rgba(255,255,255,.12); overflow: hidden; }
.about-visual::before { content: ""; position: absolute; width: 360px; height: 360px; border: 1px solid rgba(94,221,202,.2); border-radius: 50%; left: -90px; top: 90px; }
.about-visual::after { content: ""; position: absolute; width: 230px; height: 230px; border: 1px solid rgba(94,221,202,.12); border-radius: 50%; left: -25px; top: 155px; }
.about-number { position: relative; z-index: 1; font-size: clamp(7rem, 15vw, 13rem); line-height: .9; font-weight: 800; letter-spacing: -.09em; color: var(--teal); }
.about-number span { font-size: .28em; vertical-align: top; margin-left: 6px; }
.about-visual > p { position: relative; z-index: 1; margin: 24px 0 0; padding-left: 8px; color: #b5c8ce; letter-spacing: .08em; }
.signal-lines { position: absolute; right: 18px; bottom: 72px; display: flex; gap: 9px; align-items: end; }
.signal-lines i { width: 3px; background: var(--teal); display: block; }
.signal-lines i:nth-child(1) { height: 18px; opacity: .35; }
.signal-lines i:nth-child(2) { height: 36px; opacity: .55; }
.signal-lines i:nth-child(3) { height: 55px; opacity: .75; }
.signal-lines i:nth-child(4) { height: 80px; }
.about-copy { padding: 92px 0 92px 10%; }
.about-copy > p { max-width: 650px; color: #adbec5; margin: 24px 0 0; }
.about-points { margin-top: 42px; display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.about-points div { padding: 19px 0 0 18px; border-top: 1px solid rgba(255,255,255,.2); border-left: 3px solid var(--teal); }
.about-points b, .about-points span { display: block; }
.about-points b { font-size: .95rem; }
.about-points span { color: #8fa4ac; font-size: .78rem; margin-top: 4px; }

.strengths-section { background: var(--paper); }
.section-head.compact { display: block; }
.strength-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #cfdadc; border-bottom: 1px solid #cfdadc; }
.strength-grid article { min-height: 260px; padding: 30px 27px; border-right: 1px solid #cfdadc; }
.strength-grid article:first-child { border-left: 1px solid #cfdadc; }
.strength-grid span { color: var(--teal); font-size: .68rem; font-weight: 900; }
.strength-grid h3 { margin: 54px 0 10px; font-size: 1.08rem; }
.strength-grid p { margin: 0; color: var(--muted); font-size: .86rem; }

.contact-section { background: linear-gradient(120deg, var(--teal-dark), var(--teal)); color: white; padding: 95px 0; }
.contact-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 80px; align-items: center; }
.contact-heading > p { color: #d9f3ef; margin: 22px 0 0; }
.contact-actions { display: flex; gap: 12px; margin-top: 32px; }
.button.white { background: white; color: var(--teal-dark); }
.button.outline-white { border-color: rgba(255,255,255,.62); color: white; }
.contact-card { background: transparent; color: white; box-shadow: none; border-top: 1px solid rgba(255,255,255,.42); border-bottom: 1px solid rgba(255,255,255,.42); }
.contact-row { display: grid; grid-template-columns: 84px 1fr; gap: 22px; padding: 23px 8px; border-bottom: 1px solid rgba(255,255,255,.28); }
.contact-row:last-child { border-bottom: 0; }
.contact-row > span { color: #c5f2eb; font-size: .78rem; font-weight: 800; }
.contact-row div { display: flex; flex-direction: column; gap: 2px; }
.contact-row strong, .contact-row a { font-size: .91rem; font-weight: 700; }
.contact-row a:hover { color: #d9fff9; }

footer { background: #04131d; color: #8ea0a9; }
.footer-inner { min-height: 120px; position: relative; display: flex; align-items: center; justify-content: center; gap: 30px; font-size: .76rem; }
.back-top { position: absolute; right: 0; color: #c0d0d5; }
.floating-contact { position: fixed; z-index: 60; right: 24px; bottom: 24px; width: 56px; height: 56px; border-radius: 50%; display: grid; place-items: center; background: var(--teal); color: white; box-shadow: 0 12px 28px rgba(2,78,69,.3); }
.floating-contact svg { width: 23px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

@media (max-width: 1050px) {
  :root { --shell: min(100% - 36px, 940px); }
  .brand-copy { display: none; }
  .brand { min-width: auto; }
  .desktop-nav { gap: 19px; }
  .hero { min-height: 610px; }
  .hero-inner { min-height: 610px; grid-template-columns: 47% 53%; }
  .hero h1 { font-size: clamp(3rem, 6vw, 4.1rem); }
  .hero-meta { display: none; }
  .category-grid a { padding: 20px 16px; }
  .category-grid i { display: none; }
  .product-card { min-height: 500px; }
  .product-image { height: 310px; }
  .about-grid { grid-template-columns: 36% 64%; }
  .about-number { font-size: 9rem; }
  .strength-grid { grid-template-columns: repeat(2, 1fr); }
  .strength-grid article:nth-child(3) { border-left: 1px solid #cfdadc; }
  .strength-grid article:nth-child(-n+2) { border-bottom: 1px solid #cfdadc; }
}

@media (max-width: 780px) {
  :root { --shell: calc(100% - 30px); }
  html { scroll-padding-top: 72px; }
  .topline { display: none; }
  .nav-wrap { min-height: 70px; }
  .brand img { width: 82px; }
  .desktop-nav { display: none; }
  .menu-toggle { display: block; }
  .menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle.active span:nth-child(2) { opacity: 0; }
  .menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .mobile-nav { position: absolute; top: 70px; left: 0; right: 0; padding: 12px 15px 20px; background: white; border-top: 1px solid var(--line); box-shadow: 0 14px 28px rgba(0,30,40,.12); }
  .mobile-nav.open { display: grid; }
  .mobile-nav a { padding: 13px 7px; border-bottom: 1px solid #edf1f2; font-size: .92rem; font-weight: 700; }
  .hero { min-height: auto; background: #fff; }
  .hero-inner { min-height: auto; display: flex; flex-direction: column; padding-top: 0; }
  .hero-copy { padding: 62px 0 28px; width: 100%; }
  .hero h1 { margin-top: 18px; font-size: clamp(3rem, 14vw, 4.25rem); }
  .hero-copy > p { font-size: .96rem; }
  .hero-actions { flex-wrap: wrap; }
  .button { min-height: 50px; }
  .hero-visual { width: 100%; min-height: 350px; }
  .product-stage { transform: none; width: 106%; }
  .hero-label { top: 25px; right: 0; }
  .scroll-cue { display: none; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .category-grid a { min-height: 85px; border-bottom: 1px solid rgba(255,255,255,.1); }
  .section { padding: 82px 0; }
  .section-head { grid-template-columns: 1fr; gap: 25px; margin-bottom: 36px; }
  .section-head h2, .about-copy h2, .contact-heading h2 { font-size: clamp(2.05rem, 9vw, 2.85rem); }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: auto; }
  .product-image { height: 300px; }
  .product-info p { max-width: 100%; padding-right: 20px; padding-bottom: 40px; }
  .about-grid { display: block; }
  .about-visual { min-height: 390px; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.12); padding-left: 15px; }
  .about-copy { padding: 70px 0; }
  .about-points { grid-template-columns: 1fr; }
  .strength-grid { grid-template-columns: 1fr; }
  .strength-grid article, .strength-grid article:nth-child(3) { min-height: auto; border: 1px solid #cfdadc; border-bottom: 0; }
  .strength-grid article:last-child { border-bottom: 1px solid #cfdadc; }
  .strength-grid h3 { margin-top: 32px; }
  .contact-grid { grid-template-columns: 1fr; gap: 46px; }
  .contact-actions { flex-wrap: wrap; }
  .contact-row { grid-template-columns: 70px 1fr; padding: 20px; gap: 14px; }
  .footer-inner { min-height: 135px; flex-direction: column; justify-content: center; text-align: center; gap: 12px; }
  .back-top { position: static; }
  .floating-contact { width: 52px; height: 52px; right: 16px; bottom: 16px; }
}

@media (max-width: 420px) {
  .hero-actions .button { width: 100%; }
  .category-grid { grid-template-columns: 1fr; }
  .category-grid a { border-left: 1px solid rgba(255,255,255,.1); }
  .product-image { height: 260px; padding: 20px; }
  .product-info { padding: 24px; }
  .product-info a { right: 24px; bottom: 25px; }
  .contact-actions .button { width: 100%; }
}

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