:root {
  --paper: #fff;
  --ink: #0b0d0c;
  --muted: #626864;
  --line: #d9ddd9;
  --green: #176b37;
  --green-dark: #0e542a;
  --footer: #101210;
  --max: 1440px;
  --gutter: clamp(24px, 5vw, 80px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }
button { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 1000; padding: 10px 14px; background: var(--ink); color: #fff; transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--gutter);
  border-bottom: 1px solid rgba(11,13,12,.12);
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: 9px; }
.brand-mark { position: relative; width: 30px; height: 30px; flex: 0 0 30px; overflow: hidden; border-radius: 50%; background: #fff; }
.brand-mark img { position: absolute; width: 54px; max-width: none; left: -12px; top: -6px; }
.brand-name { display: flex; align-items: baseline; gap: 13px; }
.brand-cn { font-size: 22px; font-weight: 750; letter-spacing: .08em; }
.brand-en { color: var(--green); font-size: 10px; font-weight: 700; letter-spacing: .2em; }
.site-nav { display: flex; gap: clamp(26px, 3.4vw, 58px); font-size: 14px; }
.site-nav a { position: relative; padding: 30px 0; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 20px; height: 2px; background: var(--green); transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-toggle { display: none; border: 0; background: none; padding: 8px; }

.hero, .section { max-width: var(--max); margin-inline: auto; }
.hero { padding: clamp(74px, 10vw, 148px) var(--gutter) 0; }
.hero-copy { max-width: 830px; }
.hero h1 {
  margin: 0;
  font-size: clamp(58px, 8.3vw, 126px);
  line-height: .98;
  letter-spacing: -.07em;
  font-weight: 760;
}
.hero-copy > p { max-width: 620px; margin: 40px 0 32px; color: var(--muted); font-size: clamp(17px, 1.5vw, 21px); line-height: 1.8; }
.hero-actions, .cta-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border: 1px solid var(--green); font-size: 15px; font-weight: 650; transition: transform .2s, background .2s, color .2s; }
.button:hover { transform: translateY(-2px); }
.button-solid { background: var(--green); color: #fff; }
.button-solid:hover { background: var(--green-dark); }
.button-outline { color: var(--green); }
.button-outline:hover { background: #f1f7f3; }
.hero-media { margin: clamp(70px, 8vw, 112px) 0 0; }
.hero-media img { aspect-ratio: 16/8.2; object-fit: cover; object-position: center 55%; }
.hero-media figcaption { display: flex; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; letter-spacing: .08em; }
.hero-media figcaption span { color: var(--green); font-weight: 700; }

.section { padding: clamp(110px, 12vw, 176px) var(--gutter); }
.section-intro { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr); gap: 9vw; align-items: end; margin-bottom: 76px; }
.section h2, .cta h2 { margin: 0; font-size: clamp(44px, 5.4vw, 80px); line-height: 1.08; letter-spacing: -.055em; }
.section-intro p, .about-copy p { margin: 0; color: var(--muted); font-size: 17px; line-height: 1.9; }
.capabilities { padding-bottom: 40px; }
.capability { display: grid; grid-template-columns: 150px minmax(0, 1fr) 180px; gap: 44px; align-items: center; min-height: 190px; border-top: 1px solid var(--line); }
.capability:last-child { border-bottom: 1px solid var(--line); }
.capability-number { font-size: clamp(54px, 6vw, 84px); font-weight: 300; letter-spacing: -.08em; }
.capability h3 { margin: 0 0 12px; font-size: 28px; }
.capability p { max-width: 520px; margin: 0; color: var(--muted); line-height: 1.8; }
.capability-mark { justify-self: end; width: 110px; height: 44px; border-top: 1px solid #93b49e; transform: skewY(-12deg); position: relative; }
.capability-mark::after { content: ""; position: absolute; right: 0; top: -5px; width: 9px; height: 9px; border-radius: 50%; background: var(--green); }

.products { padding-top: 140px; }
.product-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; align-items: start; }
.product-media { display: block; overflow: hidden; background: #0a121a; border-radius: 8px; }
.product-media img { width: 100%; aspect-ratio: 2/1; object-fit: contain; }
.product-twin .product-media { background: #05080c; }
.product-twin .product-media img { object-fit: contain; }
.preview-options { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; min-height: 52px; padding: 10px 0; }
.preview-options button { border: 1px solid var(--line); background: #fff; color: var(--muted); padding: 6px 12px; font-size: 12px; cursor: pointer; }
.preview-options button[aria-pressed="true"] { border-color: var(--green); background: var(--green); color: #fff; }
.preview-options button:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
.preview-caption { color: var(--muted); font-size: 12px; }
.product-copy { padding: 28px 2px 0; }
.product-copy h3 { margin: 0 0 12px; font-size: 29px; }
.product-copy p { min-height: 62px; margin: 0 0 24px; color: var(--muted); line-height: 1.75; }
.arrow-link { display: inline-flex; align-items: center; gap: 28px; padding-bottom: 8px; color: var(--green); border-bottom: 1px solid #91b39d; font-weight: 650; }
.arrow-link span { transition: transform .2s; }
.arrow-link:hover span { transform: translateX(6px); }

.about { position: relative; min-height: 730px; overflow: hidden; display: grid; align-items: start; }
.about-copy { position: relative; z-index: 2; max-width: 840px; }
.about-copy p { max-width: 690px; margin-top: 42px; color: #3f4541; }
.field-lines { position: absolute; left: -5%; right: -5%; bottom: -80px; height: 360px; perspective: 500px; opacity: .7; }
.field-lines::before { content: ""; position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(255,255,255,1), rgba(255,255,255,0) 42%); z-index: 2; }
.field-lines span { position: absolute; left: 50%; bottom: 0; width: 1px; height: 440px; background: #a9b7ad; transform-origin: bottom; }
.field-lines span:nth-child(1) { transform: rotate(-67deg); }
.field-lines span:nth-child(2) { transform: rotate(-48deg); }
.field-lines span:nth-child(3) { transform: rotate(-25deg); }
.field-lines span:nth-child(4) { transform: rotate(25deg); }
.field-lines span:nth-child(5) { transform: rotate(48deg); }
.field-lines span:nth-child(6) { transform: rotate(67deg); }

.cta { position: relative; overflow: hidden; min-height: 530px; padding: clamp(72px, 8vw, 110px) var(--gutter); color: #fff; background: var(--green); }
.cta-copy { position: relative; z-index: 2; max-width: 900px; }
.cta p { max-width: 560px; margin: 28px 0 36px; font-size: 17px; line-height: 1.8; color: rgba(255,255,255,.8); }
.button-light { border-color: #fff; background: #fff; color: var(--green-dark); }
.button-ghost { border-color: rgba(255,255,255,.7); color: #fff; }
.button-ghost:hover { background: rgba(255,255,255,.1); }
.cta-landscape { position: absolute; right: -30px; bottom: -10px; width: min(56%, 760px); opacity: .38; }
.cta-landscape svg { width: 100%; fill: none; stroke: #fff; stroke-width: 1.2; }
.site-footer { width: 100%; color: #fff; background: var(--footer); }
.footer-shell { max-width: var(--max); margin-inline: auto; padding: 44px var(--gutter) 28px; }
.footer-top, .footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 64px; }
.footer-top { padding-bottom: 32px; }
.footer-bottom { padding-top: 22px; border-top: 1px solid rgba(255,255,255,.18); }
.footer-brand { display: flex; align-items: baseline; gap: 30px; }
.footer-brand strong { display: flex; align-items: center; gap: 13px; font-size: 27px; letter-spacing: .06em; white-space: nowrap; }
.footer-brand strong > span { width: 4px; height: 28px; background: var(--green); }
.footer-brand p, .contact-label, .footer-bottom > p { margin: 0; color: rgba(255,255,255,.58); }
.footer-brand p { font-size: 14px; }
.footer-contact { display: flex; align-items: center; gap: 24px; }
.contact-label { display: flex; align-items: center; gap: 10px; font-size: 14px; white-space: nowrap; }
.contact-label i { width: 1px; height: 14px; background: rgba(255,255,255,.28); }
.contact-phone { display: flex; align-items: center; gap: 13px; font-size: clamp(24px, 2.2vw, 34px); font-weight: 650; letter-spacing: .025em; white-space: nowrap; }
.contact-phone svg { width: 23px; height: 23px; fill: none; stroke: #2ca55d; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.contact-phone .contact-arrow { width: 25px; height: 25px; transition: transform .2s ease; }
.footer-contact:hover .contact-arrow { transform: translateX(5px); }
.footer-bottom nav { display: flex; flex-wrap: wrap; align-items: center; gap: 0; font-size: 13px; }
.footer-bottom nav a { display: flex; align-items: center; }
.footer-bottom nav a:not(:last-child)::after { content: "/"; margin: 0 24px; color: rgba(255,255,255,.28); }
.footer-bottom nav a:hover { color: #86d39e; }
.footer-bottom > p { font-size: 12px; }
.footer-icp { margin: 20px 0 0; text-align: center; font-size: 13px; line-height: 1.6; color: #aab0ac; }
.footer-icp a:hover { color: #fff; text-decoration: underline; }
.footer-icp a:focus-visible { outline: 2px solid #86d39e; outline-offset: 4px; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); transition-delay: var(--delay, 0ms); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 820px) {
  .site-header { height: 70px; }
  .brand-mark { width: 28px; height: 28px; flex-basis: 28px; }
  .brand-mark img { width: 51px; left: -11px; top: -6px; }
  .brand-cn { font-size: 19px; }
  .brand-en { display: none; }
  .menu-toggle { display: grid; gap: 4px; }
  .menu-toggle span:not(.sr-only) { width: 24px; height: 1px; background: var(--ink); }
  .site-nav { position: fixed; inset: 70px 0 auto; display: grid; gap: 0; padding: 22px var(--gutter) 30px; background: #fff; border-bottom: 1px solid var(--line); transform: translateY(-130%); transition: transform .3s ease; }
  .site-nav.is-open { transform: none; }
  .site-nav a { padding: 15px 0; font-size: 18px; }
  .site-nav a::after { display: none; }
  .hero { padding-top: 68px; }
  .hero h1 { font-size: clamp(52px, 15vw, 76px); }
  .hero-copy > p { margin-top: 28px; }
  .hero-media { margin-top: 52px; margin-inline: calc(var(--gutter) * -1); }
  .hero-media img { aspect-ratio: 4/3; }
  .hero-media figcaption { margin-inline: var(--gutter); }
  .section-intro { grid-template-columns: 1fr; gap: 28px; margin-bottom: 48px; }
  .capability { grid-template-columns: 76px 1fr; gap: 24px; min-height: 170px; }
  .capability-number { font-size: 48px; }
  .capability-mark { display: none; }
  .product-grid { grid-template-columns: 1fr; gap: 70px; }
  .product-copy p { min-height: auto; }
  .about { min-height: 650px; }
  .cta { min-height: 600px; }
  .cta-landscape { width: 100%; }
  .footer-shell { padding-top: 38px; }
  .footer-top, .footer-bottom { align-items: flex-start; }
  .footer-brand { display: grid; gap: 12px; }
  .footer-contact { align-items: flex-start; }
}

@media (max-width: 480px) {
  .hero h1 { letter-spacing: -.075em; }
  .button { width: 100%; }
  .section { padding-top: 96px; padding-bottom: 96px; }
  .capability { grid-template-columns: 58px 1fr; }
  .capability-number { font-size: 38px; }
  .capability h3 { font-size: 23px; }
  .product-media img { aspect-ratio: 2/1; }
  .footer-shell { padding: 34px var(--gutter) 24px; }
  .footer-top { display: grid; gap: 32px; padding-bottom: 28px; }
  .footer-brand strong { font-size: 24px; }
  .footer-brand p { max-width: 260px; line-height: 1.7; }
  .footer-contact { display: grid; gap: 10px; }
  .contact-phone { font-size: 28px; }
  .footer-bottom { display: grid; gap: 24px; padding-top: 22px; }
  .footer-bottom nav { row-gap: 12px; }
  .footer-bottom nav a:not(:last-child)::after { margin: 0 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}