@font-face {
  font-family: "Geist Variable";
  src: url("assets/geist-latin.woff2") format("woff2-variations");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --ink: #172126;
  --muted: #667177;
  --line: #dfe3e5;
  --paper: #ffffff;
  --paper-soft: #f5f6f6;
  --navy: #17272d;
  --copper: #a65f38;
  --copper-soft: #e9d5c5;
  --sans: "Geist Variable", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
  --page: min(1180px, calc(100vw - 64px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; color: var(--ink); background: var(--paper); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
svg { display: block; }
::selection { background: var(--copper-soft); }

.skip-link { position: fixed; z-index: 1000; top: 10px; left: 10px; padding: 10px 14px; color: #fff; background: var(--navy); transform: translateY(-160%); }
.skip-link:focus { transform: none; }

.site-header { position: fixed; z-index: 100; inset: 0 0 auto; height: 78px; background: rgba(255, 255, 255, .96); border-bottom: 1px solid rgba(223, 227, 229, .8); transition: box-shadow .25s ease; }
.site-header.scrolled { box-shadow: 0 8px 28px rgba(23, 33, 38, .07); }
.nav-wrap { width: var(--page); height: 100%; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 36px; }
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { width: 40px; height: 40px; }
.brand-mark rect { fill: var(--navy); stroke: var(--navy); }
.brand-mark path { fill: #fff; }
.brand > span { display: grid; gap: 5px; line-height: 1; }
.brand strong { font-family: var(--serif); font-size: 16px; letter-spacing: .13em; }
.brand small { color: #8a9397; font-size: 8px; font-weight: 650; letter-spacing: .18em; }
.desktop-nav { display: flex; align-items: center; gap: 34px; }
.desktop-nav a { position: relative; color: #465158; font-size: 13px; transition: color .2s ease; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -10px; height: 1px; background: var(--copper); transition: right .22s ease; }
.desktop-nav a:hover, .desktop-nav a:focus-visible { color: var(--copper); }
.desktop-nav a:hover::after, .desktop-nav a:focus-visible::after { right: 0; }
.menu-toggle, .mobile-nav { display: none; }

main { overflow: hidden; }
.hero { min-height: 740px; padding: 158px 0 80px; display: flex; align-items: center; background: #f8f9f9; border-bottom: 1px solid var(--line); }
.hero-inner { width: var(--page); margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.16fr) minmax(360px, .84fr); align-items: center; gap: clamp(50px, 8vw, 110px); }
.eyebrow, .section-index { margin: 0; color: var(--copper); font-size: 10px; font-weight: 700; letter-spacing: .19em; }
.hero h1 { max-width: 760px; margin: 28px 0 0; font-family: var(--serif); font-size: clamp(54px, 5.3vw, 74px); font-weight: 600; letter-spacing: -.045em; line-height: 1.18; }
.hero-summary { max-width: 570px; margin: 30px 0 0; color: var(--muted); font-size: 15px; line-height: 1.9; }
.hero-actions { margin-top: 38px; display: flex; align-items: center; gap: 30px; }
.button { min-height: 48px; padding: 0 23px; display: inline-flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 650; border: 1px solid var(--navy); transition: background .22s ease, color .22s ease, transform .22s ease; }
.button-primary { color: #fff; background: var(--navy); }
.button-primary:hover, .button-primary:focus-visible { background: var(--copper); border-color: var(--copper); transform: translateY(-2px); }
.text-link { color: #465158; font-size: 13px; }
.text-link span { display: inline-block; margin-left: 8px; transition: transform .22s ease; }
.text-link:hover { color: var(--copper); }
.text-link:hover span { transform: translateX(4px); }

.hero-visual { position: relative; aspect-ratio: 1 / 1.04; overflow: hidden; padding: 28px; color: #fff; background: var(--navy); }
.hero-visual::after { content: ""; position: absolute; inset: 0; pointer-events: none; background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px); background-size: 25% 25%; }
.hero-visual svg { position: absolute; z-index: 1; inset: 10% -13% 8% -8%; width: 121%; height: 82%; }
.visual-label { position: relative; z-index: 2; display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
.visual-label span { font-size: 13px; }
.visual-label small { color: rgba(255,255,255,.42); font-size: 8px; letter-spacing: .17em; }
.hero-visual > p { position: absolute; z-index: 2; right: 28px; bottom: 26px; margin: 0; color: rgba(255,255,255,.55); font-size: 10px; letter-spacing: .17em; }

.section { padding: 118px 0; }
.section-inner { width: var(--page); margin: 0 auto; }
.section-heading h2 { margin: 20px 0 0; font-family: var(--serif); font-size: clamp(40px, 4.4vw, 60px); font-weight: 600; letter-spacing: -.04em; line-height: 1.16; }
.about-grid, .contact-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(80px, 11vw, 160px); }
.about-content { max-width: 700px; }
.lead { margin: 0; font-family: var(--serif); font-size: clamp(24px, 2.35vw, 34px); font-weight: 600; letter-spacing: -.025em; line-height: 1.55; }
.about-content > p:not(.lead) { max-width: 650px; margin: 30px 0 0; color: var(--muted); font-size: 14px; line-height: 2; }
.about-content .note { padding-top: 22px; border-top: 1px solid var(--line); font-size: 12px !important; }

.products { background: var(--paper-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.products-head { margin-bottom: 58px; display: flex; align-items: end; justify-content: space-between; gap: 70px; }
.products-head > p { max-width: 420px; margin: 0 0 4px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.product-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid #d8dddf; background: #d8dddf; gap: 1px; }
.product-card { min-height: 390px; padding: 28px; display: flex; flex-direction: column; justify-content: space-between; background: #fff; transition: background .25s ease; }
.product-card:hover { background: #fbf7f4; }
.product-primary { color: #fff; background: var(--navy); }
.product-primary:hover { background: #20343b; }
.card-number { margin: 0; color: #9aa2a6; font-size: 10px; letter-spacing: .12em; }
.product-primary .card-number { color: rgba(255,255,255,.44); }
.product-card span { color: var(--copper); font-size: 10px; font-weight: 700; letter-spacing: .13em; }
.product-card h3 { margin: 12px 0 0; font-family: var(--serif); font-size: 25px; font-weight: 600; letter-spacing: -.025em; }
.product-card > div:last-child > p { margin: 17px 0 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.product-primary > div:last-child > p { color: rgba(255,255,255,.58); }
.card-symbol { position: relative; width: 92px; height: 92px; align-self: center; }
.symbol-coil i { position: absolute; inset: 15px 0; border: 2px solid #bd805c; border-radius: 50%; transform: rotate(-15deg); }
.symbol-coil i:nth-child(2) { inset: 25px 12px; }
.symbol-coil i:nth-child(3) { inset: 35px 24px; }
.symbol-route::before { content: ""; position: absolute; left: 8px; right: 8px; top: 45px; height: 1px; background: #c7cdcf; transform: rotate(-28deg); }
.symbol-route i { position: absolute; width: 12px; height: 12px; top: 57px; left: 7px; border: 2px solid var(--copper); border-radius: 50%; background: #fff; }
.symbol-route i:last-child { top: 21px; left: auto; right: 7px; }
.symbol-sun { border: 1px solid #d9dddf; }
.symbol-sun::before, .symbol-sun::after { content: ""; position: absolute; background: #d9dddf; }
.symbol-sun::before { left: 50%; top: 0; bottom: 0; width: 1px; }
.symbol-sun::after { top: 50%; left: 0; right: 0; height: 1px; }
.symbol-sun i { position: absolute; z-index: 1; width: 30px; height: 30px; right: 12px; top: 12px; border-radius: 50%; background: var(--copper); }
.symbol-industry { display: flex; align-items: end; gap: 7px; border-bottom: 1px solid #c7cdcf; }
.symbol-industry i { width: 22px; height: 38px; background: #d9dddf; }
.symbol-industry i:nth-child(2) { height: 62px; }
.symbol-industry i:nth-child(3) { height: 50px; background: var(--copper); }

.contact { padding-bottom: 130px; }
.contact-content { max-width: 700px; }
.contact-content > p:nth-child(2) { max-width: 590px; margin: 24px 0 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.contact address { margin-top: 48px; padding: 30px 0; display: grid; gap: 10px; font-style: normal; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.contact address span { color: var(--copper); font-size: 10px; font-weight: 700; letter-spacing: .13em; }
.contact address strong { font-family: var(--serif); font-size: clamp(20px, 2vw, 27px); font-weight: 600; }

.site-footer { padding: 0; color: rgba(255,255,255,.54); background: var(--navy); border-top: 1px solid rgba(255,255,255,.14); }
.footer-legal { width: var(--page); min-height: 82px; margin: 0 auto; display: flex; align-items: center; justify-content: center; gap: 13px; text-align: center; }
.copyright { margin: 0; font-size: 11px; letter-spacing: .025em; }
.legal-separator { color: rgba(255,255,255,.25); font-size: 14px; }
.icp-link { min-height: 30px; display: inline-flex; align-items: center; color: rgba(255,255,255,.62); font-size: 11px; letter-spacing: .025em; transition: color .2s ease; }
.icp-link:hover, .icp-link:focus-visible { color: #fff; }

@media (max-width: 960px) {
  :root { --page: calc(100vw - 40px); }
  .desktop-nav { display: none; }
  .menu-toggle { width: 44px; height: 44px; display: grid; place-content: center; gap: 7px; padding: 0; background: transparent; border: 1px solid var(--line); }
  .menu-toggle span { display: block; width: 20px; height: 1px; background: var(--ink); transition: transform .25s ease; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  .mobile-nav { position: fixed; z-index: 90; inset: 78px 0 auto; padding: 16px 20px 26px; display: grid; color: var(--ink); background: #fff; border-bottom: 1px solid var(--line); visibility: hidden; opacity: 0; transform: translateY(-8px); transition: visibility .25s, opacity .25s, transform .25s; }
  .mobile-nav.open { visibility: visible; opacity: 1; transform: none; }
  .mobile-nav a { padding: 17px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
  .hero { min-height: 0; padding: 134px 0 76px; }
  .hero-inner { grid-template-columns: 1fr .78fr; gap: 42px; }
  .hero h1 { font-size: clamp(46px, 6.7vw, 62px); }
  .about-grid, .contact-grid { grid-template-columns: .6fr 1.4fr; gap: 60px; }
  .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-card { min-height: 350px; }
}

@media (max-width: 700px) {
  :root { --page: calc(100vw - 36px); }
  .site-header { height: 70px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand strong { font-size: 14px; }
  .mobile-nav { top: 70px; }
  .hero { padding: 116px 0 56px; }
  .hero-inner { display: block; }
  .hero h1 { margin-top: 22px; font-size: clamp(40px, 11.3vw, 50px); line-height: 1.24; }
  .hero-summary { margin-top: 24px; font-size: 14px; }
  .hero-actions { margin-top: 30px; gap: 22px; }
  .button { min-height: 46px; padding-inline: 18px; font-size: 12px; }
  .text-link { font-size: 12px; }
  .hero-visual { width: 100%; margin-top: 48px; aspect-ratio: 1.25 / 1; padding: 22px; }
  .hero-visual > p { right: 22px; bottom: 21px; }
  .section { padding: 82px 0; }
  .about-grid, .contact-grid { display: block; }
  .about-content, .contact-content { margin-top: 46px; }
  .section-heading h2 { margin-top: 16px; font-size: 40px; }
  .lead { font-size: 25px; }
  .about-content > p:not(.lead) { margin-top: 24px; }
  .products-head { display: block; margin-bottom: 40px; }
  .products-head > p { margin-top: 22px; }
  .product-grid { grid-template-columns: 1fr; }
  .product-card { min-height: 310px; padding: 24px; }
  .card-symbol { width: 82px; height: 82px; }
  .contact { padding-bottom: 90px; }
  .contact address { margin-top: 38px; padding: 25px 0; }
  .footer-legal { min-height: 104px; padding: 22px 0; flex-direction: column; gap: 6px; }
  .legal-separator { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}