:root {
  --ink: #152820;
  --green: #183d32;
  --green-2: #255747;
  --gold: #b48a4a;
  --cream: #f4efe5;
  --paper: #faf8f2;
  --muted: #68736d;
  --line: rgba(24, 61, 50, .16);
  --container: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.section { padding: 120px 0; }
.page-noise {
  position: fixed; inset: 0; z-index: 20; pointer-events: none; opacity: .04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.4'/%3E%3C/svg%3E");
}

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 15; height: 84px;
  color: white; transition: background .35s, box-shadow .35s, height .35s;
}
.site-header.scrolled { height: 72px; color: var(--ink); background: rgba(250,248,242,.94); backdrop-filter: blur(14px); box-shadow: 0 8px 32px rgba(18,42,34,.08); }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 12px; position: relative; z-index: 2; }
.brand-mark {
  width: 46px; height: 46px; display: grid; place-items: center; flex: none;
  border: 1px solid currentColor; font-family: "STKaiti", "KaiTi", serif; font-size: 16px; letter-spacing: 1px;
  transform: rotate(45deg); border-radius: 5px;
}
.brand-mark::first-line { transform: rotate(-45deg); }
.brand-mark { writing-mode: horizontal-tb; }
.brand-mark { text-indent: 0; }
.brand-mark { --r: -45deg; }
.brand-mark { line-height: 46px; text-align: center; }
.brand-mark { color: inherit; }
.brand-mark { clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%); background: rgba(255,255,255,.08); }
.brand-mark { transform: none; border-radius: 0; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.25; }
.brand-copy strong { font-family: "STSong", "SimSun", serif; font-size: 21px; letter-spacing: 4px; }
.brand-copy small { margin-top: 4px; font: 9px/1 Arial, sans-serif; letter-spacing: 2.2px; opacity: .65; }
.site-nav { display: flex; align-items: center; gap: 34px; font-size: 14px; }
.site-nav a { position: relative; transition: color .25s; }
.site-nav a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 1px; background: currentColor; transition: right .25s; }
.site-nav a:hover::after, .site-nav a.active::after { right: 0; }
.nav-cta { border: 1px solid rgba(255,255,255,.55); padding: 8px 17px; }
.scrolled .nav-cta { border-color: var(--line); }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 9px; background: none; border: 0; color: inherit; }
.menu-toggle span { display: block; height: 1px; margin: 6px 0; background: currentColor; transition: .25s; }

.hero { min-height: 760px; height: 100svh; position: relative; display: flex; align-items: center; color: white; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background: url("../assets/hero.jpg") center/cover no-repeat; transform: scale(1.03); animation: heroZoom 16s ease-out forwards; }
@keyframes heroZoom { to { transform: scale(1.12); } }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(8,26,20,.82) 0%, rgba(13,34,27,.54) 47%, rgba(10,24,20,.15) 80%), linear-gradient(0deg, rgba(8,20,16,.28), transparent 55%); }
.hero-content { position: relative; z-index: 1; padding-top: 54px; }
.eyebrow, .kicker { margin: 0 0 22px; color: var(--gold); font-size: 12px; font-weight: 700; letter-spacing: .26em; }
.hero h1 { max-width: 760px; margin: 0; font-family: "STSong", "SimSun", serif; font-size: clamp(52px, 6.4vw, 94px); font-weight: 400; line-height: 1.13; letter-spacing: .02em; }
.hero h1 em { color: #e7c990; font-style: normal; }
.hero-lead { max-width: 600px; margin: 34px 0 38px; color: rgba(255,255,255,.77); font-size: 17px; line-height: 2; }
.hero-actions { display: flex; align-items: center; gap: 34px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 28px; border: 1px solid transparent; cursor: pointer; transition: transform .25s, background .25s, color .25s; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: white; background: var(--gold); }
.btn-primary:hover { background: #c19a5e; }
.text-link { padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,.45); font-size: 14px; }
.text-link span { margin-left: 12px; color: var(--gold); }
.hero-aside { position: absolute; right: 34px; top: 50%; display: flex; align-items: center; gap: 14px; transform: rotate(90deg) translateX(50%); transform-origin: right center; font: 10px/1 Arial; letter-spacing: .24em; opacity: .65; }
.hero-aside i { width: 54px; height: 1px; background: currentColor; }
.scroll-cue { position: absolute; left: 50%; bottom: 30px; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 9px; font-size: 10px; letter-spacing: .2em; opacity: .65; transform: translateX(-50%); }
.scroll-cue span { width: 1px; height: 34px; background: linear-gradient(white 50%, transparent 50%); background-size: 100% 200%; animation: scroll 1.8s infinite; }
@keyframes scroll { to { background-position: 0 -200%; } }

.intro { background: var(--paper); }
.intro-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 12%; align-items: start; }
.section-heading h2 { margin: 0; font-family: "STSong", "SimSun", serif; font-size: clamp(38px, 4vw, 58px); font-weight: 400; line-height: 1.35; }
.intro-copy { padding-top: 14px; }
.intro-copy p { margin: 0 0 22px; color: var(--muted); }
.intro-copy .lead { color: var(--ink); font-family: "STSong", "SimSun", serif; font-size: 23px; line-height: 1.9; }
.values { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 46px; padding-top: 30px; border-top: 1px solid var(--line); }
.values div { display: flex; flex-direction: column; gap: 4px; }
.values strong { color: var(--green); font: 36px/1 "STKaiti", "KaiTi", serif; }
.values span { color: var(--muted); font-size: 12px; letter-spacing: .12em; }

.feature-image { height: min(70vw, 720px); min-height: 500px; position: relative; background: linear-gradient(90deg, rgba(11,35,27,.15), rgba(11,35,27,.5)), url("../assets/materials.jpg") center/cover no-repeat; }
.feature-card { position: absolute; right: max(6vw, 48px); bottom: -55px; width: min(500px, calc(100% - 48px)); padding: 52px 58px; color: white; background: var(--green); box-shadow: 0 28px 60px rgba(20,50,40,.24); }
.feature-card p { margin: 0 0 18px; color: #d9bd88; font-size: 12px; letter-spacing: .24em; }
.feature-card blockquote { margin: 0; font-family: "STSong", "SimSun", serif; font-size: clamp(25px, 2.7vw, 36px); line-height: 1.65; }

.business { padding-top: 180px; }
.heading-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12%; align-items: end; margin-bottom: 64px; }
.heading-row > p { max-width: 480px; margin: 0 0 8px; color: var(--muted); }
.business-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.business-card { min-height: 350px; position: relative; padding: 34px 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .3s, color .3s, transform .3s; }
.business-card:hover { color: white; background: var(--green); transform: translateY(-8px); }
.card-num { font: 11px/1 Arial; letter-spacing: .18em; opacity: .5; }
.line-icon { height: 74px; display: flex; align-items: center; gap: 7px; margin: 44px 0 26px; color: var(--gold); font: 38px/1 "STKaiti", serif; }
.line-icon i { display: block; width: 3px; height: 44px; background: currentColor; transform: rotate(22deg); }
.line-icon i:nth-child(2) { height: 64px; }.line-icon i:nth-child(3) { height: 34px; }
.business-card h3 { margin: 0 0 15px; font-family: "STSong", "SimSun", serif; font-size: 23px; font-weight: 600; }
.business-card p { margin: 0; color: var(--muted); font-size: 14px; }
.business-card:hover p { color: rgba(255,255,255,.66); }

.products { color: white; background: #102c24; }
.heading-row.light .kicker { color: #d1ad71; }
.heading-row.light > p { color: rgba(255,255,255,.6); }
.product-grid { display: grid; grid-template-columns: 1.15fr .85fr .85fr; grid-template-rows: 360px 360px; gap: 18px; }
.product-card { position: relative; overflow: hidden; background: #23483c; }
.product-tall { grid-row: 1 / 3; }
.product-card:nth-child(4) { grid-column: 2 / 4; }
.product-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.product-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,20,15,.68), transparent 48%); }
.product-card:hover img { transform: scale(1.045); }
.product-meta { position: absolute; left: 24px; right: 24px; bottom: 20px; z-index: 1; display: flex; align-items: center; justify-content: space-between; }
.product-meta span { font-family: "STSong", "SimSun", serif; font-size: 20px; }
.product-meta small { font-size: 10px; letter-spacing: .18em; opacity: .58; }

.culture-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 9%; align-items: center; }
.culture-image { position: relative; padding-bottom: 40px; }
.culture-image img { width: 100%; aspect-ratio: 1.3 / 1; object-fit: cover; }
.culture-image span { position: absolute; right: -30px; bottom: 0; padding: 18px 28px; color: white; background: var(--gold); font: 15px/1.4 "STSong", serif; letter-spacing: .1em; }
.culture-copy h2 { margin: 0 0 30px; font: 400 clamp(38px,4vw,58px)/1.35 "STSong", "SimSun", serif; }
.culture-copy > p:not(.kicker) { color: var(--muted); }
.culture-copy ul { list-style: none; margin: 34px 0 0; padding: 0; border-top: 1px solid var(--line); }
.culture-copy li { display: flex; gap: 22px; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--line); }
.culture-copy li span { color: var(--gold); font: 11px/1 Arial; }

.cooperation { padding: 110px 0; color: white; text-align: center; background: linear-gradient(rgba(18,58,46,.88), rgba(18,58,46,.9)), url("../assets/international.png") center 42%/cover no-repeat; background-attachment: fixed; }
.cooperation h2 { margin: 0 0 16px; font: 400 clamp(38px,5vw,64px)/1.3 "STSong", "SimSun", serif; }
.cooperation-inner > p:not(.kicker) { color: rgba(255,255,255,.7); letter-spacing: .16em; }
.btn-light { margin-top: 22px; color: var(--green); background: white; }

.contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 12%; }
.contact-copy h2 { margin: 0 0 26px; font: 400 clamp(38px,4vw,58px)/1.35 "STSong", "SimSun", serif; }
.contact-copy > p:not(.kicker) { color: var(--muted); }
.contact-note { display: flex; flex-direction: column; gap: 4px; margin-top: 46px; padding-left: 20px; border-left: 2px solid var(--gold); }
.contact-note span { color: var(--muted); font-size: 13px; }
.contact-form { display: grid; gap: 22px; padding: 38px; background: #f0ebdf; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-form label { color: var(--muted); font-size: 12px; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; margin-top: 8px; padding: 12px 0; color: var(--ink); background: transparent; border: 0; border-bottom: 1px solid rgba(24,61,50,.28); border-radius: 0; outline: 0; }
.contact-form textarea { resize: vertical; }
.contact-form input:focus, .contact-form select:focus, .contact-form textarea:focus { border-color: var(--gold); }
.contact-form .btn { justify-self: start; margin-top: 4px; border: 0; }
.form-status { min-height: 24px; margin: -10px 0 0; color: var(--green); font-size: 13px; }

.site-footer { padding: 64px 0 22px; color: rgba(255,255,255,.75); background: #0d241e; }
.footer-main { display: flex; justify-content: space-between; align-items: center; padding-bottom: 42px; border-bottom: 1px solid rgba(255,255,255,.12); }
.footer-brand { display: flex; align-items: center; gap: 18px; }
.footer-brand > div { display: flex; flex-direction: column; }
.footer-brand strong { color: white; font-family: "STSong", serif; letter-spacing: .1em; }
.footer-brand small { margin-top: 5px; font: 9px/1 Arial; letter-spacing: .2em; opacity: .55; }
.footer-nav { display: flex; gap: 28px; font-size: 13px; }
.footer-nav a:hover { color: white; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding-top: 20px; font-size: 12px; opacity: .58; }
.footer-bottom a:hover { opacity: 1; text-decoration: underline; }
.back-top { position: fixed; right: 24px; bottom: 24px; z-index: 12; width: 44px; height: 44px; color: white; background: var(--green); border: 0; opacity: 0; visibility: hidden; cursor: pointer; transform: translateY(12px); transition: .25s; }
.back-top.show { opacity: 1; visibility: visible; transform: none; }

.reveal { opacity: 0; transform: translateY(28px); transition: opacity .75s ease, transform .75s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 960px) {
  .section { padding: 90px 0; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .site-nav { position: fixed; top: 0; left: 0; width: 100vw; height: 100dvh; display: flex; flex-direction: column; justify-content: center; gap: 28px; color: white; background: var(--green); transform: translateX(100%); transition: transform .35s ease; }
  .site-nav.open { transform: none; }
  .site-nav a { font: 28px/1.4 "STSong", serif; }
  .site-nav .nav-cta { border-color: rgba(255,255,255,.4); font-size: 20px; }
  .menu-open .menu-toggle { color: white; }
  .menu-open .menu-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-open .menu-toggle span:nth-child(2) { opacity: 0; }
  .menu-open .menu-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr 1fr; grid-template-rows: 520px 300px 300px; }
  .product-tall { grid-row: auto; grid-column: 1 / 3; }
  .product-card:nth-child(4) { grid-column: 1 / 3; }
  .culture-grid { gap: 6%; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 36px), var(--container)); }
  .site-header { height: 70px; }
  .brand-mark { width: 40px; height: 40px; line-height: 40px; font-size: 14px; }
  .brand-copy strong { font-size: 17px; letter-spacing: 2px; }
  .hero { min-height: 680px; }
  .hero-shade { background: linear-gradient(90deg, rgba(8,26,20,.84), rgba(13,34,27,.35)), linear-gradient(0deg, rgba(8,20,16,.35), transparent 60%); }
  .hero h1 { font-size: clamp(46px, 14vw, 66px); }
  .hero-lead { font-size: 15px; line-height: 1.85; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 16px; }
  .hero-aside { display: none; }
  .scroll-cue { display: none; }
  .intro-grid, .heading-row, .culture-grid, .contact-grid { grid-template-columns: 1fr; gap: 44px; }
  .intro-copy .lead { font-size: 20px; }
  .values { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .feature-image { min-height: 520px; height: 78vh; }
  .feature-card { right: 18px; bottom: -62px; padding: 34px 30px; }
  .business { padding-top: 160px; }
  .heading-row { margin-bottom: 44px; }
  .business-grid { grid-template-columns: 1fr; }
  .business-card { min-height: 290px; }
  .line-icon { margin: 30px 0 20px; }
  .product-grid { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 390px 220px 250px; gap: 10px; }
  .product-meta { left: 14px; right: 14px; bottom: 12px; }
  .product-meta span { font-size: 16px; }
  .culture-image span { right: 0; }
  .cooperation { padding: 90px 0; background-attachment: scroll; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 28px 22px; }
  .footer-main { align-items: flex-start; flex-direction: column; gap: 34px; }
  .footer-nav { display: grid; grid-template-columns: 1fr 1fr; width: 100%; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}

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