:root {
  --ink: #121212;
  --muted: #686868;
  --line: #e6e6e6;
  --paper: #ffffff;
  --soft: #f5f5f3;
  --accent: #f2aa12;
  --accent-dark: #d58f00;
  --yellow: #f3b61f;
  --black: #0a0a0a;
  --max: 1220px;
  --radius: 18px;
  --shadow: 0 18px 45px rgba(0,0,0,.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.container { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.section { padding: 92px 0; }
.section--soft { background: var(--soft); }
.section--dark { background: #111; color: white; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 38px; }
.section-head h2, .page-hero h1 { margin: 0; letter-spacing: -.035em; line-height: 1.03; }
.section-head h2 { font-size: clamp(2rem, 4vw, 3.5rem); max-width: 780px; }
.section-head p { max-width: 560px; color: var(--muted); margin: 0; }
.section--dark .section-head p { color: #bdbdbd; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; font-size: .78rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; margin-bottom: 25px; }
.eyebrow::before { content: ""; width: 30px; height: 3px; background: var(--accent); }
.muted { color: var(--muted); }

.topbar { background: #080808; color: #d8d8d8; font-size: .8rem; }
.topbar .container { min-height: 34px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.topbar a { color: #fff; }

.site-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.94); backdrop-filter: blur(14px); border-bottom: 1px solid rgba(0,0,0,.06); }
.header-inner { min-height: 92px; display: flex; align-items: center; gap: 26px; }
.brand { display: inline-flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px; flex: 0 0 auto; line-height: 1; }
.brand-logo { width: 190px; height: auto; display: block; }
.brand-cn { display: flex; flex-direction: column; align-items: center; color: #111; line-height: 1.05; margin-top: 1px; }
.brand-cn strong { font-size: .72rem; font-weight: 800; letter-spacing: .32em; margin-right: -.32em; }
.brand-cn small { margin-top: 2px; font-size: .5rem; font-weight: 700; letter-spacing: .22em; color: #6a6a6a; margin-right: -.22em; }
.brand--footer { align-items: flex-start; }
.brand--footer .brand-logo { width: 185px; background: #fff; padding: 3px 5px; border-radius: 4px; }
.brand--footer .brand-cn { color: #fff; align-items: flex-start; padding-left: 4px; }
.brand--footer .brand-cn small { color: #8e8e8e; }
.brand--404 { margin: 0 auto 32px; }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 25px; }
.main-nav a { font-size: .92rem; font-weight: 700; color: #252525; position: relative; padding: 35px 0 33px; }
.main-nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: 25px; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform .2s ease; }
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch { display: inline-flex; border: 1px solid #ddd; border-radius: 999px; padding: 3px; }
.lang-switch button { border: 0; background: transparent; border-radius: 999px; padding: 6px 9px; font-size: .75rem; font-weight: 800; color: #666; }
.lang-switch button.active { background: #111; color: #fff; }
.menu-toggle { display: none; border: 0; background: #111; color: #fff; width: 42px; height: 42px; border-radius: 10px; font-size: 1.2rem; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 0 19px; border-radius: 999px; border: 1px solid transparent; font-weight: 800; transition: transform .18s ease, background .18s ease, border-color .18s ease; }
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-dark); }
.btn--dark { background: #111; color: #fff; }
.btn--outline { border-color: #cfcfcf; background: rgba(255,255,255,.04); }
.btn--white { background: #fff; color: #111; }
.btn--small { min-height: 40px; padding: 0 15px; font-size: .85rem; }

.hero { min-height: 690px; position: relative; display: grid; align-items: end; overflow: hidden; color: white; background: #111; }
.hero-media { position: absolute; inset: 0; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,0,0,.77) 0%, rgba(0,0,0,.43) 44%, rgba(0,0,0,.06) 72%), linear-gradient(0deg, rgba(0,0,0,.44), transparent 45%); }
.hero-content { position: relative; z-index: 2; padding: 118px 0 74px; }
.hero-copy { max-width: 760px; }
.hero h1 { font-size: clamp(3rem, 7vw, 6.4rem); margin: 0 0 22px; line-height: .94; letter-spacing: -.055em; }
.hero p { font-size: clamp(1.04rem, 1.5vw, 1.3rem); max-width: 670px; color: #e7e7e7; margin: 0 0 31px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 44px; }
.hero-badge { padding: 9px 12px; border-radius: 999px; border: 1px solid rgba(255,255,255,.28); background: rgba(0,0,0,.24); backdrop-filter: blur(8px); font-size: .8rem; font-weight: 700; }

.selector-strip { position: relative; margin-top: -1px; background: #111; color: white; }
.selector-grid { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); }
.selector-item { padding: 24px 24px 27px; border-right: 1px solid rgba(255,255,255,.12); }
.selector-item:last-child { border-right: 0; }
.selector-item strong { display: block; margin-bottom: 5px; font-size: .95rem; }
.selector-item span { color: #aaa; font-size: .84rem; }

.category-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.category-grid--six .category-card { grid-column: span 4; min-height: 300px; }
.category-card { min-height: 390px; border-radius: var(--radius); overflow: hidden; position: relative; color: white; box-shadow: var(--shadow); }
.category-grid:not(.category-grid--six) .category-card:nth-child(1), .category-grid:not(.category-grid--six) .category-card:nth-child(4) { grid-column: span 7; }
.category-grid:not(.category-grid--six) .category-card:nth-child(2), .category-grid:not(.category-grid--six) .category-card:nth-child(3) { grid-column: span 5; }
.category-card img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; transition: transform .45s ease; }
.category-card:hover img { transform: scale(1.035); }
.category-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(0,0,0,.78), rgba(0,0,0,.02) 63%); }
.category-content { position: absolute; z-index: 2; left: 26px; right: 26px; bottom: 24px; }
.category-content h3 { margin: 0 0 8px; font-size: 1.55rem; letter-spacing: -.025em; }
.category-content p { margin: 0; color: #ddd; max-width: 560px; }

.split { display: grid; grid-template-columns: 1.03fr .97fr; gap: 60px; align-items: center; }
.split-media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); min-height: 520px; }
.split-media img { width: 100%; height: 100%; min-height: 520px; object-fit: cover; }
.split-copy h2 { font-size: clamp(2.2rem, 4vw, 4rem); line-height: 1.02; letter-spacing: -.045em; margin: 0 0 22px; }
.split-copy > p { color: var(--muted); font-size: 1.03rem; }
.check-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-top: 29px; }
.check-item { border-top: 1px solid var(--line); padding-top: 14px; }
.check-item strong { display: block; margin-bottom: 5px; }
.check-item span { color: var(--muted); font-size: .9rem; }

.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.process-card { padding: 28px; border: 1px solid #333; border-radius: 16px; background: #171717; }
.process-no { display: inline-flex; align-items: center; justify-content: center; width: 37px; height: 37px; border-radius: 50%; background: var(--accent); font-weight: 900; margin-bottom: 45px; }
.process-card h3 { margin: 0 0 9px; }
.process-card p { color: #aaa; margin: 0; font-size: .92rem; }

.cta-band { background: var(--accent); color: white; }
.cta-band .container { min-height: 260px; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.cta-band h2 { margin: 0; font-size: clamp(2rem, 4vw, 4rem); line-height: 1; letter-spacing: -.045em; max-width: 760px; }
.cta-band p { color: #ffd8d9; max-width: 600px; }

.page-hero { background: #111; color: white; padding: 96px 0 72px; position: relative; overflow: hidden; }
.page-hero::after { content: ""; position: absolute; width: 420px; height: 420px; border-radius: 50%; right: -120px; top: -240px; border: 80px solid rgba(215,25,32,.2); }
.page-hero .container { position: relative; z-index: 2; }
.page-hero h1 { font-size: clamp(3rem, 7vw, 6.1rem); max-width: 1000px; }
.page-hero p { color: #bdbdbd; max-width: 750px; font-size: 1.1rem; margin: 23px 0 0; }
.page-hero--image { min-height: 420px; display: grid; align-items: end; }
.page-hero--image::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(0,0,0,.76) 0%, rgba(0,0,0,.48) 40%, rgba(0,0,0,.18) 72%), linear-gradient(0deg, rgba(0,0,0,.35), transparent 45%); width: auto; height: auto; right: auto; top: auto; border: 0; border-radius: 0; }
.page-hero-media { position: absolute; inset: 0; }
.page-hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.page-hero--image .container { padding-top: 86px; padding-bottom: 54px; }
.page-hero--image p { color: rgba(255,255,255,.88); max-width: 670px; }
.split-media--contain { min-height: 340px; display: flex; align-items: center; justify-content: center; background: #101010; }
.split-media--contain img { width: 100%; height: 100%; min-height: 0; object-fit: contain; background: #101010; }

.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 34px; }
.filter-btn { border: 1px solid #ddd; background: #fff; padding: 10px 14px; border-radius: 999px; font-weight: 800; font-size: .84rem; }
.filter-btn.active { background: #111; border-color: #111; color: #fff; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-card { border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: #fff; transition: box-shadow .2s ease, transform .2s ease; display: flex; flex-direction: column; }
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.product-card-media { aspect-ratio: 4 / 3; background: #f1f1f1; overflow: hidden; }
.product-card-media img { width: 100%; height: 100%; object-fit: cover; }
.product-card-body { padding: 21px; display: flex; flex-direction: column; flex: 1; }
.product-kicker { color: var(--accent); text-transform: uppercase; font-size: .72rem; font-weight: 900; letter-spacing: .12em; }
.product-card h3 { margin: 8px 0 9px; font-size: 1.28rem; letter-spacing: -.02em; }
.product-card p { margin: 0 0 18px; color: var(--muted); font-size: .92rem; }
.product-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; padding-top: 15px; border-top: 1px solid var(--line); }
.product-meta span { font-size: .73rem; font-weight: 800; background: #f2f2f2; padding: 6px 8px; border-radius: 7px; }
.product-card .card-link { margin-top: 18px; color: var(--accent); font-weight: 900; font-size: .88rem; }

.detail-wrap { padding: 68px 0 96px; }
.detail-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 55px; align-items: start; }
.detail-media { border-radius: var(--radius); overflow: hidden; background: #f2f2f2; border: 1px solid #e8e8e8; position: sticky; top: 116px; }
.detail-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.detail-copy .product-kicker { margin-bottom: 12px; display: block; }
.detail-copy h1 { font-size: clamp(2.4rem, 5vw, 4.8rem); letter-spacing: -.05em; line-height: .98; margin: 0 0 18px; }
.detail-copy .lead { color: var(--muted); font-size: 1.08rem; }
.detail-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 28px 0; }
.fact { background: var(--soft); border-radius: 12px; padding: 17px; }
.fact small { display: block; color: var(--muted); font-size: .72rem; text-transform: uppercase; font-weight: 900; letter-spacing: .08em; margin-bottom: 4px; }
.fact strong { font-size: .95rem; }
.detail-copy h2 { font-size: 1.25rem; margin: 30px 0 12px; }
.bullet-list { margin: 0; padding-left: 18px; color: #4f4f4f; }
.bullet-list li { margin: 8px 0; }
.disclaimer { margin-top: 26px; padding: 15px 17px; border-left: 3px solid var(--yellow); background: #fff8e3; color: #705a1e; font-size: .85rem; }

.application-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.application-card { padding: 27px; border-radius: 16px; border: 1px solid var(--line); min-height: 240px; }
.application-icon { width: 46px; height: 46px; border-radius: 11px; background: #111; color: #fff; display: grid; place-items: center; font-weight: 900; margin-bottom: 44px; }
.application-card h3 { margin: 0 0 9px; font-size: 1.28rem; }
.application-card p { color: var(--muted); margin: 0; }

.about-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; align-items: start; }
.about-statement { font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1.07; letter-spacing: -.04em; margin: 0; }
.about-copy p { color: var(--muted); font-size: 1.03rem; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 40px; }
.principle { border-top: 3px solid #111; padding-top: 18px; }
.principle h3 { margin: 0 0 8px; }
.principle p { margin: 0; color: var(--muted); font-size: .9rem; }
.company-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 28px; }
.company-facts div { border: 1px solid var(--line); background: #fff; border-radius: 12px; padding: 16px; }
.company-facts strong { display: block; font-size: .86rem; margin-bottom: 4px; }
.company-facts span { color: var(--muted); font-size: .84rem; }

.contact-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 58px; align-items: start; }
.contact-side { position: sticky; top: 116px; }
.contact-side h2 { font-size: clamp(2rem, 4vw, 3.6rem); line-height: 1; letter-spacing: -.04em; margin: 0 0 20px; }
.contact-side p { color: var(--muted); }
.contact-email { display: inline-block; font-size: 1.18rem; font-weight: 900; margin-top: 14px; border-bottom: 2px solid var(--accent); }
.contact-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: 0 15px 35px rgba(0,0,0,.05); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 17px; }
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: .78rem; font-weight: 900; text-transform: uppercase; letter-spacing: .06em; }
.field input, .field select, .field textarea { width: 100%; border: 1px solid #d7d7d7; border-radius: 10px; background: #fff; padding: 12px 13px; color: #111; outline: none; transition: border-color .18s ease, box-shadow .18s ease; }
.field textarea { min-height: 150px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { border-color: #111; box-shadow: 0 0 0 3px rgba(0,0,0,.05); }
.form-note { color: var(--muted); font-size: .79rem; margin: 14px 0 0; }
.form-status { margin-top: 13px; min-height: 22px; font-size: .9rem; font-weight: 700; }
.form-status.success { color: #16713b; }
.form-status.error { color: #a70f14; }
.hp-field { position: absolute !important; left: -10000px !important; width: 1px !important; height: 1px !important; overflow: hidden !important; }

.site-footer { background: #090909; color: #fff; padding: 65px 0 25px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, .7fr); gap: 35px; }
.footer-brand p { max-width: 420px; color: #9f9f9f; }
.footer-col h4 { font-size: .8rem; text-transform: uppercase; letter-spacing: .1em; color: #777; margin: 4px 0 15px; }
.footer-col a { display: block; margin: 8px 0; color: #d8d8d8; font-size: .9rem; }
.footer-bottom { margin-top: 45px; border-top: 1px solid #252525; padding-top: 20px; display: flex; justify-content: space-between; gap: 25px; color: #777; font-size: .78rem; }
.footer-bottom a { color: #aaa; }

.not-found { text-align: center; padding: 120px 20px; }
.not-found h1 { font-size: 5rem; margin: 0; }

@media (max-width: 980px) {
  .main-nav { position: fixed; left: 20px; right: 20px; top: 136px; background: #fff; border: 1px solid #ddd; border-radius: 14px; padding: 15px; display: none; flex-direction: column; align-items: stretch; gap: 0; box-shadow: var(--shadow); }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 13px 10px; }
  .main-nav a::after { display: none; }
  .menu-toggle { display: inline-grid; place-items: center; }
  .header-actions .btn { display: none; }
  .selector-grid { grid-template-columns: 1fr 1fr; }
  .selector-item:nth-child(2) { border-right: 0; }
  .selector-item:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.12); }
  .category-card, .category-card:nth-child(n) { grid-column: span 6; min-height: 340px; }
  .split, .detail-grid, .contact-layout, .about-grid { grid-template-columns: 1fr; }
  .split-media { min-height: 410px; }
  .split-media img { min-height: 410px; }
  .process-grid { grid-template-columns: 1fr 1fr; }
  .product-grid, .application-grid { grid-template-columns: 1fr 1fr; }
  .detail-media, .contact-side { position: static; }
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr; }
  .footer-grid .footer-col:last-child { grid-column: 2 / 4; }
}

@media (max-width: 680px) {
  .container { width: min(100% - 26px, var(--max)); }
  .topbar .container { min-height: 38px; font-size: .72rem; }
  .topbar .topbar-note { display: none; }
  .header-inner { min-height: 82px; gap: 12px; }
  .brand-logo { width: 150px; }
  .brand-cn strong { font-size: .62rem; }
  .brand-cn small { font-size: .44rem; }
  .lang-switch button { padding: 5px 7px; }
  .main-nav { top: 124px; left: 13px; right: 13px; }
  .section { padding: 66px 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 14px; }
  .hero { min-height: 635px; }
  .hero-media::after { background: linear-gradient(90deg, rgba(0,0,0,.75), rgba(0,0,0,.25)), linear-gradient(0deg, rgba(0,0,0,.65), transparent 55%); }
  .hero-content { padding: 105px 0 48px; }
  .hero h1 { font-size: clamp(3rem, 16vw, 4.8rem); }
  .hero-actions .btn { width: 100%; }
  .hero-badges { margin-top: 30px; }
  .selector-grid { grid-template-columns: 1fr; }
  .selector-item { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.12); }
  .selector-item:last-child { border-bottom: 0; }
  .category-grid { grid-template-columns: 1fr; }
  .category-card, .category-card:nth-child(n) { grid-column: 1; min-height: 330px; }
  .split { gap: 34px; }
  .check-grid { grid-template-columns: 1fr; }
  .process-grid, .product-grid, .application-grid, .principles, .company-facts { grid-template-columns: 1fr; }
  .process-no { margin-bottom: 25px; }
  .cta-band .container { min-height: 310px; flex-direction: column; align-items: flex-start; justify-content: center; }
  .page-hero { padding: 72px 0 55px; }
  .page-hero h1 { font-size: clamp(2.8rem, 15vw, 4.8rem); }
  .detail-wrap { padding: 45px 0 70px; }
  .detail-facts { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .field--full { grid-column: auto; }
  .contact-card { padding: 20px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-grid .footer-col:last-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; }
}