:root {
  --ink: #10251f;
  --green: #0d6b50;
  --green-light: #72b99a;
  --mist: #edf4f0;
  --line: #dbe5e0;
  --paper: #f7f9f7;
  --muted: #66756f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 82px; }
body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, summary { font: inherit; }

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  width: 100%;
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  background: rgba(7, 28, 23, .86);
  border-bottom: 1px solid rgba(255,255,255,.13);
  backdrop-filter: blur(14px);
  color: #fff;
}
.brand { display: inline-flex; align-items: center; gap: 13px; }
.brand > span:last-child { display: flex; flex-direction: column; }
.brand strong { font-size: 20px; letter-spacing: .18em; line-height: 1.25; }
.brand small { margin-top: 3px; font-size: 8px; letter-spacing: .19em; opacity: .68; }
.brand-mark {
  position: relative;
  width: 35px;
  height: 42px;
  display: inline-block;
  border: 1px solid rgba(255,255,255,.58);
  border-radius: 20px 20px 18px 18px;
  transform: rotate(36deg);
}
.brand-mark::before {
  content: "";
  position: absolute;
  width: 10px;
  height: 22px;
  top: 8px;
  left: 11px;
  border: 2px solid #78c2a3;
  border-top: 0;
  border-radius: 0 0 10px 10px;
}
.brand-mark i { position: absolute; width: 8px; height: 8px; border-radius: 50%; background: #b7dfce; left: 14px; top: 7px; }
.desktop-nav { display: flex; align-items: center; height: 100%; gap: clamp(22px, 2.8vw, 48px); font-size: 14px; }
.desktop-nav > a:not(.nav-contact) { position: relative; opacity: .82; transition: opacity .25s; }
.desktop-nav > a:not(.nav-contact)::after { content: ""; position: absolute; left: 0; bottom: -10px; width: 0; height: 1px; background: #8fd0b4; transition: width .25s; }
.desktop-nav > a:hover { opacity: 1; }
.desktop-nav > a:hover::after { width: 100%; }
.nav-contact { padding: 14px 24px; border-left: 1px solid rgba(255,255,255,.2); border-right: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.08); }
.mobile-nav { display: none; }

.hero {
  position: relative;
  height: min(880px, 100vh);
  min-height: 690px;
  overflow: hidden;
  color: #fff;
  background: #0b2821 url("/hero.jpg") center / cover no-repeat;
}
.hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(4,20,16,.95) 0%, rgba(5,25,20,.78) 33%, rgba(5,25,20,.16) 68%, rgba(5,25,20,.08)); }
.hero-shade { position: absolute; z-index: 1; inset: 0; background: linear-gradient(0deg, rgba(4,20,16,.42), transparent 40%); }
.hero-content { position: relative; z-index: 2; width: min(760px, 90vw); padding-top: clamp(185px, 25vh, 245px); margin-left: 9vw; }
.eyebrow { margin: 0 0 22px; color: var(--green); font-size: 13px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase; }
.eyebrow.light, .hero-kicker { color: #9ed7bd; }
.hero-kicker { display: flex; align-items: center; gap: 12px; animation: rise .75s both; }
.hero-kicker span { width: 32px; height: 1px; background: #9ed7bd; }
.hero h1 { margin: 0; max-width: 740px; font-size: clamp(45px, 5.15vw, 76px); line-height: 1.18; font-weight: 500; letter-spacing: .02em; animation: rise .8s .08s both; }
.hero-copy { max-width: 650px; margin: 28px 0 0; color: rgba(255,255,255,.73); font-size: 16px; line-height: 1.9; animation: rise .8s .16s both; }
.hero-actions { display: flex; gap: 14px; margin-top: 38px; animation: rise .8s .24s both; }
.button { min-width: 165px; height: 52px; display: inline-flex; align-items: center; justify-content: center; gap: 22px; border: 1px solid rgba(255,255,255,.35); font-size: 14px; transition: transform .25s, background .25s; }
.button:hover { transform: translateY(-3px); }
.button-primary { border-color: #1b8a68; background: #137457; }
.button-primary:hover { background: #178463; }
.button-ghost { background: rgba(255,255,255,.05); }
.hero-index { position: absolute; z-index: 3; right: 5vw; bottom: 74px; display: flex; align-items: center; gap: 10px; font-size: 11px; }
.hero-index b { font-size: 24px; font-weight: 400; }
.hero-index span { width: 82px; height: 1px; background: linear-gradient(90deg,#fff 25%,rgba(255,255,255,.3) 25%); }
.hero-index small { opacity: .55; }
.scroll-cue { position: absolute; z-index: 3; left: 5vw; bottom: 0; width: 56px; height: 134px; display: flex; align-items: center; flex-direction: column; gap: 18px; }
.scroll-cue span { font-size: 8px; letter-spacing: .24em; writing-mode: vertical-rl; opacity: .6; }
.scroll-cue i { flex: 1; width: 1px; background: rgba(255,255,255,.45); overflow: hidden; }
.scroll-cue i::after { content: ""; display: block; width: 1px; height: 42px; background: #fff; animation: scroll 2s infinite; }

.section { padding-left: 8vw; padding-right: 8vw; }
.section-label { color: #7d8b86; font-size: 10px; font-weight: 700; letter-spacing: .2em; }
.section-label span { display: inline-block; margin-right: 12px; color: var(--green); }
.section-label.light { color: rgba(255,255,255,.44); }
.section-label.light span { color: #8ad0b1; }
.intro { display: grid; grid-template-columns: 1.15fr 1.05fr .85fr; gap: 4vw; padding-top: 126px; padding-bottom: 126px; }
.intro-main h2, .section-heading h2, .services h2, .about h2, .contact h2 { margin: 0; font-size: clamp(34px, 3.4vw, 54px); line-height: 1.35; font-weight: 500; letter-spacing: .01em; }
.intro-main .eyebrow { margin-top: 50px; }
.intro-copy { padding-top: 73px; }
.intro-copy > p { margin: 0; color: var(--muted); font-size: 15px; line-height: 2; }
.text-link { display: inline-flex; gap: 18px; margin-top: 28px; padding-bottom: 8px; color: var(--green); border-bottom: 1px solid #96c9b3; font-size: 13px; }

.products { padding-top: 116px; padding-bottom: 128px; background: var(--paper); }
.section-heading { display: flex; justify-content: space-between; gap: 5vw; align-items: end; margin-bottom: 64px; }
.section-heading .eyebrow { margin: 46px 0 18px; }
.section-heading > p { width: 35%; min-width: 300px; margin: 0 0 4px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.product-card { position: relative; min-width: 0; background: #fff; border: 1px solid #e6ece8; transition: transform .35s, box-shadow .35s; }
.product-card:hover { transform: translateY(-8px); box-shadow: 0 22px 46px rgba(19,68,53,.1); }
.product-image { position: relative; height: 235px; background-image: linear-gradient(180deg,rgba(3,25,19,.03),rgba(3,25,19,.38)), url("/hero.jpg"); background-size: 330%; filter: saturate(.72); overflow: hidden; }
.product-image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg,rgba(102,181,146,.06),transparent); transition: background .3s; }
.product-card:hover .product-image::after { background: rgba(14,108,80,.02); }
.product-image span { position: absolute; z-index: 1; top: 18px; left: 18px; display: grid; place-items: center; width: 38px; height: 38px; color: #fff; border: 1px solid rgba(255,255,255,.55); font-size: 10px; }
.product-body { position: relative; min-height: 238px; padding: 29px 26px 34px; }
.product-body small { color: #8d9b96; font-size: 9px; letter-spacing: .13em; }
.product-body h3 { margin: 10px 0 14px; font-size: 20px; font-weight: 600; }
.product-body p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.85; }
.card-arrow { position: absolute; right: 24px; bottom: 20px; color: var(--green); font-size: 19px; transition: transform .3s; }
.product-card:hover .card-arrow { transform: translate(4px,-4px); }

.services { position: relative; overflow: hidden; color: #fff; background: #092d24; }
.services-backdrop { position: absolute; inset: 0; opacity: .11; background-image: linear-gradient(rgba(255,255,255,.25) 1px, transparent 1px), linear-gradient(90deg,rgba(255,255,255,.25) 1px,transparent 1px); background-size: 80px 80px; mask-image: linear-gradient(90deg,transparent,#000); }
.services-inner { position: relative; display: grid; grid-template-columns: .9fr 1.1fr; gap: 7vw; padding-top: 128px; padding-bottom: 128px; }
.services-title .eyebrow { margin: 52px 0 18px; }
.services-title h2 { font-size: clamp(34px, 3.3vw, 52px); }
.service-list { border-top: 1px solid rgba(255,255,255,.18); }
.service-item { display: grid; grid-template-columns: 54px 1fr 36px; gap: 20px; align-items: start; padding: 30px 4px; border-bottom: 1px solid rgba(255,255,255,.18); }
.service-num { margin-top: 5px; color: #76bb9d; font-size: 11px; }
.service-item h3 { margin: 0 0 9px; font-size: 20px; font-weight: 500; }
.service-item p { margin: 0; max-width: 500px; color: rgba(255,255,255,.57); font-size: 13px; line-height: 1.85; }
.service-item i { color: rgba(255,255,255,.6); font-style: normal; font-size: 20px; transition: transform .25s; }
.service-item:hover i { transform: translateX(7px); }

.about { display: grid; grid-template-columns: 1.05fr .95fr; gap: 9vw; padding-top: 135px; padding-bottom: 135px; }
.about-visual { position: relative; }
.about-photo { height: 580px; background: linear-gradient(180deg,transparent 40%,rgba(4,27,21,.45)), url("/hero.jpg") 75% center / cover; }
.about-note { position: absolute; right: -42px; bottom: 0; width: 290px; padding: 29px 30px; display: flex; flex-direction: column; color: #fff; background: #0d6b50; }
.about-note strong { margin-bottom: 8px; font-size: 17px; letter-spacing: .08em; }
.about-note span { color: rgba(255,255,255,.64); font-size: 11px; }
.about-copy { padding-top: 48px; }
.about-copy .eyebrow { margin: 48px 0 18px; }
.about-copy > p:last-of-type { margin: 29px 0 0; color: var(--muted); font-size: 15px; line-height: 2; }
.about-values { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-top: 42px; padding-top: 30px; border-top: 1px solid var(--line); }
.about-values div { display: flex; flex-direction: column; gap: 8px; }
.about-values b { color: var(--green); font-size: 22px; font-weight: 500; }
.about-values span { color: var(--muted); font-size: 11px; }

.contact { position: relative; overflow: hidden; padding: 112px 9vw 108px; color: #fff; background: #0b3127; }
.contact::before { content: ""; position: absolute; inset: 0; opacity: .08; background: url("/hero.jpg") center / cover; }
.contact-orb { position: absolute; width: 580px; height: 580px; right: -120px; top: -260px; border: 1px solid rgba(121,201,167,.25); border-radius: 50%; }
.contact-orb::before, .contact-orb::after { content: ""; position: absolute; border: 1px solid rgba(121,201,167,.16); border-radius: 50%; }
.contact-orb::before { inset: 70px; }.contact-orb::after { inset: 145px; }
.contact-inner { position: relative; max-width: 930px; }
.contact h2 { margin-top: 16px; font-size: clamp(38px, 4.1vw, 60px); }
.contact-inner > p:nth-of-type(2) { max-width: 650px; margin: 26px 0 0; color: rgba(255,255,255,.64); font-size: 14px; line-height: 1.9; }
.contact-meta { display: flex; flex-wrap: wrap; gap: 32px 60px; margin-top: 48px; padding-top: 28px; border-top: 1px solid rgba(255,255,255,.15); }
.contact-meta > span, .contact-meta > a { display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.contact-meta small { color: #80bfa5; font-size: 9px; letter-spacing: .18em; }
.contact-phone { color: #fff; transition: color .25s, transform .25s; }
.contact-phone:hover { color: #a6dbc4; transform: translateY(-2px); }

footer { padding: 58px 8vw 24px; color: rgba(255,255,255,.7); background: #061a15; }
.footer-main { display: flex; align-items: center; gap: 50px; padding-bottom: 45px; }
.brand-footer { color: #fff; }
.footer-main > p { margin: 0 auto 0 0; color: rgba(255,255,255,.45); font-size: 12px; }
.footer-main nav { display: flex; gap: 28px; font-size: 12px; }
.footer-main nav a:hover, .footer-bottom a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; padding-top: 23px; border-top: 1px solid rgba(255,255,255,.1); color: rgba(255,255,255,.38); font-size: 11px; }
.footer-bottom a { color: rgba(255,255,255,.58); }

.reveal { animation: reveal linear both; animation-timeline: view(); animation-range: entry 5% cover 26%; }
@keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }
@keyframes reveal { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: none; } }
@keyframes scroll { from { transform: translateY(-45px); } to { transform: translateY(96px); } }

@media (max-width: 1100px) {
  .desktop-nav { gap: 22px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .product-image { background-size: 200%; }
  .intro { grid-template-columns: 1fr 1.4fr; }
  .intro-copy { grid-column: 2; padding-top: 0; }
  .services-inner { grid-template-columns: 1fr 1.2fr; gap: 5vw; }
  .about { gap: 7vw; }
}

@media (max-width: 760px) {
  html { scroll-padding-top: 68px; }
  .site-header { height: 68px; padding: 0 20px; }
  .desktop-nav { display: none; }
  .brand strong { font-size: 17px; }.brand small { font-size: 7px; }
  .brand-mark { width: 29px; height: 35px; }.brand-mark::before { left: 8px; top: 7px; }.brand-mark i { left: 11px; top: 6px; }
  .mobile-nav { display: block; position: relative; }
  .mobile-nav summary { width: 34px; height: 34px; display: flex; flex-direction: column; justify-content: center; gap: 5px; cursor: pointer; list-style: none; }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav summary span { width: 22px; height: 1px; margin-left: auto; background: #fff; }
  .mobile-nav summary span:nth-child(2) { width: 16px; }
  .mobile-nav nav { position: fixed; top: 68px; left: 0; width: 100%; padding: 15px 20px 25px; display: flex; flex-direction: column; background: #0a2c23; border-top: 1px solid rgba(255,255,255,.1); box-shadow: 0 16px 30px rgba(0,0,0,.25); }
  .mobile-nav nav a { padding: 14px 4px; border-bottom: 1px solid rgba(255,255,255,.1); font-size: 14px; }
  .hero { min-height: 660px; height: 100svh; background-position: 62% center; }
  .hero::after { background: linear-gradient(90deg,rgba(4,20,16,.94),rgba(5,25,20,.5)), linear-gradient(0deg,rgba(4,20,16,.45),transparent); }
  .hero-content { width: auto; margin: 0 24px; padding-top: 165px; }
  .hero h1 { font-size: clamp(38px, 11vw, 54px); line-height: 1.24; }
  .hero-copy { font-size: 14px; line-height: 1.8; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .button { width: 190px; }
  .hero-index { right: 22px; bottom: 28px; }
  .scroll-cue { display: none; }
  .section { padding-left: 22px; padding-right: 22px; }
  .intro { display: block; padding-top: 85px; padding-bottom: 86px; }
  .intro-main .eyebrow { margin-top: 36px; }
  .intro-main h2, .section-heading h2, .services h2, .about h2, .contact h2 { font-size: 32px; }
  .intro-copy { margin-top: 32px; }
  .products { padding-top: 85px; padding-bottom: 88px; }
  .section-heading { display: block; margin-bottom: 40px; }
  .section-heading .eyebrow { margin-top: 36px; }
  .section-heading > p { width: auto; min-width: 0; margin-top: 25px; }
  .product-grid { grid-template-columns: 1fr; }
  .product-image { height: 225px; }
  .product-body { min-height: 210px; }
  .services-inner { display: block; padding-top: 86px; padding-bottom: 88px; }
  .services-title { margin-bottom: 46px; }
  .services-title .eyebrow { margin-top: 36px; }
  .service-item { grid-template-columns: 38px 1fr 24px; gap: 12px; padding: 24px 0; }
  .about { display: flex; flex-direction: column-reverse; padding-top: 86px; padding-bottom: 110px; }
  .about-copy { padding-top: 0; }
  .about-copy .eyebrow { margin-top: 36px; }
  .about-values { gap: 5px; }
  .about-values b { font-size: 19px; }
  .about-photo { height: 410px; }
  .about-note { right: -4px; bottom: -38px; width: 270px; }
  .contact { padding: 86px 22px 80px; }
  .contact-meta { flex-direction: column; gap: 22px; margin-top: 35px; }
  footer { padding: 48px 22px 22px; }
  .footer-main { align-items: flex-start; flex-direction: column; gap: 22px; }
  .footer-main > p { margin: 0; }
  .footer-main nav { flex-wrap: wrap; gap: 15px 24px; }
  .footer-bottom { flex-direction: column; gap: 13px; line-height: 1.6; }
}

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