:root {
  color-scheme: dark;
  --ink: #06090b;
  --ink-2: #0b1114;
  --ink-3: #10191d;
  --white: #e7f7f8;
  --muted: #9bb0b4;
  --line: rgba(181, 229, 232, .18);
  --cyan: #6fe6e8;
  --amber: #f2b65a;
  --max: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body {
  margin: 0;
  background: var(--ink);
  color: var(--white);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}
img { display: block; width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.skip-link {
  position: fixed;
  z-index: 999;
  top: 8px;
  left: 8px;
  transform: translateY(-140%);
  background: var(--white);
  color: var(--ink);
  padding: 8px 14px;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto;
  min-height: 78px;
  padding: 0 clamp(22px, 4vw, 70px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(6, 9, 11, .93), rgba(6, 9, 11, .64));
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 12px; white-space: nowrap; }
.brand-mark { width: 34px; height: 34px; flex: 0 0 auto; }
.brand-wording { display: flex; align-items: baseline; gap: 15px; }
.brand-cn { font-size: 20px; font-weight: 700; letter-spacing: .12em; }
.brand-en { color: var(--muted); font-size: 9px; letter-spacing: .26em; }
.site-nav { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 38px); }
.site-nav a { color: #d5e4e6; font-size: 13px; letter-spacing: .08em; transition: color .2s ease; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--cyan); }
.site-nav .nav-contact { padding-left: 22px; border-left: 1px solid var(--line); }
.menu-toggle { display: none; }

.hero {
  position: relative;
  min-height: 100svh;
  padding: 155px clamp(24px, 8vw, 140px) 120px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-media, .hero-shade { position: absolute; inset: 0; height: 100%; object-fit: cover; }
.hero-media { object-position: center; filter: saturate(.88) contrast(1.04); }
.hero-shade {
  background:
    linear-gradient(90deg, rgba(3, 6, 8, .98) 0%, rgba(3, 6, 8, .82) 35%, rgba(3, 6, 8, .13) 68%, rgba(3, 6, 8, .35) 100%),
    linear-gradient(180deg, rgba(3, 6, 8, .12) 60%, rgba(3, 6, 8, .9) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 720px; }
h1, h2, h3 { margin: 0; font-family: Georgia, "Songti SC", "SimSun", serif; font-weight: 400; line-height: 1.08; }
h1 { font-size: clamp(54px, 7.2vw, 118px); letter-spacing: -.045em; }
h1 em { color: var(--cyan); font-style: normal; text-shadow: 0 0 34px rgba(111, 230, 232, .18); }
.hero-copy { max-width: 620px; margin: 34px 0 0; color: #c0ced0; font-size: clamp(15px, 1.25vw, 19px); }
.hero-actions { display: flex; gap: 14px; margin-top: 42px; }
.button {
  min-height: 50px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  border: 1px solid var(--line);
  border-radius: 0;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.button-primary { background: var(--cyan); border-color: var(--cyan); color: #041012; font-weight: 700; }
.button-primary:hover, .button-primary:focus-visible { background: var(--white); border-color: var(--white); }
.button-quiet { background: rgba(6, 9, 11, .5); }
.button-quiet:hover, .button-quiet:focus-visible { border-color: var(--cyan); color: var(--cyan); }
.hero-index {
  position: absolute;
  z-index: 2;
  right: clamp(24px, 4.8vw, 82px);
  bottom: 52px;
  display: flex;
  gap: 36px;
}
.hero-index span { min-width: 100px; padding-left: 14px; border-left: 1px solid var(--line); color: var(--muted); font-size: 10px; letter-spacing: .08em; }
.hero-index b { display: block; color: var(--white); font-size: 15px; font-weight: 500; letter-spacing: .04em; }
.scroll-cue { position: absolute; z-index: 2; left: clamp(24px, 4vw, 70px); bottom: 38px; color: var(--muted); font-size: 10px; letter-spacing: .2em; writing-mode: vertical-rl; }
.scroll-cue span { display: block; width: 1px; height: 60px; margin: 14px auto 0; background: linear-gradient(var(--cyan), transparent); }

.band { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
.intro { padding: clamp(90px, 11vw, 160px) 0; display: grid; grid-template-columns: .5fr 1.6fr .8fr; gap: 7vw; align-items: end; border-bottom: 1px solid var(--line); }
.section-no { margin: 0; color: #6e8387; font-family: Consolas, monospace; font-size: 10px; letter-spacing: .18em; }
.intro-lead { margin: 0; font-family: Georgia, "Songti SC", "SimSun", serif; font-size: clamp(31px, 4vw, 62px); line-height: 1.28; }
.intro-note { margin: 0; color: var(--muted); font-size: 13px; }

.products { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: clamp(100px, 12vw, 180px) 0; }
.section-head { display: grid; grid-template-columns: 1fr 2fr; gap: 40px; margin-bottom: 80px; }
.section-head h2, .application-head h2, .processing-title-block h2, .development h2, .about h2, .contact h2 { font-size: clamp(42px, 6vw, 88px); letter-spacing: -.035em; }
.product-row { min-height: 540px; display: grid; grid-template-columns: 1.65fr .72fr; border-top: 1px solid var(--line); }
.product-row:last-child { border-bottom: 1px solid var(--line); }
.product-row-reverse { grid-template-columns: .72fr 1.65fr; }
.product-row-reverse .product-visual { order: 2; }
.product-visual { margin: 0; overflow: hidden; }
.product-visual img { height: 100%; object-fit: cover; transition: transform 1s cubic-bezier(.2, .7, .2, 1); }
.product-row:hover img { transform: scale(1.025); }
.product-copy { padding: 62px clamp(28px, 4vw, 66px); display: flex; flex-direction: column; align-items: flex-start; border-left: 1px solid var(--line); }
.product-row-reverse .product-copy { border-left: 0; border-right: 1px solid var(--line); }
.product-number { color: var(--cyan); font-family: Consolas, monospace; font-size: 11px; letter-spacing: .18em; }
.product-copy h3 { margin-top: auto; font-size: clamp(36px, 4.5vw, 70px); }
.product-copy p { margin: 28px 0; color: var(--muted); font-size: 14px; }
.product-copy a { margin-top: auto; padding-bottom: 5px; border-bottom: 1px solid var(--cyan); color: var(--cyan); font-size: 12px; letter-spacing: .08em; }

.processing { position: relative; background: var(--ink-2); display: grid; grid-template-columns: 1fr 1fr; overflow: hidden; }
.processing-media { min-height: 700px; overflow: hidden; }
.processing-media img { height: 100%; object-fit: cover; }
.processing-title-block { padding: clamp(70px, 8vw, 130px); align-self: center; }
.processing-title-block .section-no { margin-bottom: 50px; }
.process-line { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); padding: 0 clamp(24px, 6vw, 100px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.process-line div { min-height: 260px; padding: 46px clamp(24px, 4vw, 58px); border-left: 1px solid var(--line); }
.process-line div:last-child { border-right: 1px solid var(--line); }
.process-line b { display: block; margin-bottom: 58px; color: var(--amber); font-family: Consolas, monospace; font-size: 11px; }
.process-line span { display: block; font-family: Georgia, "Songti SC", "SimSun", serif; font-size: 26px; }
.process-line p { max-width: 250px; margin: 15px 0 0; color: var(--muted); font-size: 13px; }
.processing-detail { grid-column: 1 / -1; min-height: 620px; }

.applications { padding: clamp(110px, 13vw, 190px) 0; }
.application-head { width: min(calc(100% - 48px), var(--max)); margin: 0 auto 70px; display: grid; grid-template-columns: 1fr 2fr; }
.application-stage { position: relative; width: min(calc(100% - 48px), 1500px); height: min(72vw, 860px); margin: 0 auto; overflow: hidden; }
.application-stage::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 50%, rgba(3, 6, 8, .7)); pointer-events: none; }
.application-stage img { height: 100%; object-fit: cover; }
.application-label { position: absolute; z-index: 2; bottom: 42px; display: flex; align-items: baseline; gap: 14px; padding-top: 12px; border-top: 1px solid var(--cyan); }
.application-label span { color: var(--cyan); font: 10px Consolas, monospace; }
.application-label strong { font-family: Georgia, "Songti SC", "SimSun", serif; font-size: clamp(18px, 2vw, 30px); font-weight: 400; }
.label-a { left: 5%; }
.label-b { right: 5%; }
.application-boundary { width: min(calc(100% - 48px), var(--max)); margin: 22px auto 0; color: var(--muted); font-size: 12px; text-align: right; }

.development { min-height: 830px; display: grid; grid-template-columns: 1.15fr 1fr; background: var(--ink-3); }
.development > img { height: 100%; object-fit: cover; }
.development-copy { padding: clamp(70px, 8vw, 130px); display: flex; flex-direction: column; justify-content: center; }
.development-copy .section-no { margin-bottom: 52px; }
.year-line { margin-top: 76px; padding: 28px 0; display: grid; grid-template-columns: 130px 1fr; gap: 30px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.year-line strong { color: var(--amber); font: 36px Georgia, serif; }
.year-line span { align-self: center; font-size: 15px; }
.development-copy > p:last-child { max-width: 520px; color: var(--muted); font-size: 12px; }

.about { padding: clamp(110px, 14vw, 210px) 0; display: grid; grid-template-columns: .65fr 1.5fr .9fr; gap: 6vw; border-bottom: 1px solid var(--line); }
.about-copy { color: var(--muted); font-size: 14px; }
.about-copy p:first-child { margin-top: 0; color: var(--white); }

.contact { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; padding: clamp(100px, 12vw, 180px) 0; display: grid; grid-template-columns: .9fr 1.1fr; gap: 9vw; }
.contact-intro > p:not(.section-no) { max-width: 520px; color: var(--muted); font-size: 14px; }
.contact-intro .section-no { margin-bottom: 50px; }
address { margin-top: 64px; padding-top: 20px; border-top: 1px solid var(--line); font-style: normal; font-size: 14px; }
address span { display: block; margin-bottom: 8px; color: var(--muted); font-size: 10px; letter-spacing: .18em; }
.inquiry-form { align-self: end; }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.inquiry-form label { display: block; margin-bottom: 28px; color: var(--muted); font-size: 11px; letter-spacing: .12em; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea {
  width: 100%;
  margin-top: 7px;
  padding: 13px 0;
  border: 0;
  border-bottom: 1px solid rgba(231, 247, 248, .26);
  border-radius: 0;
  outline: 0;
  background: transparent;
  color: var(--white);
  resize: vertical;
}
.inquiry-form select { background: var(--ink); }
.inquiry-form input:focus, .inquiry-form select:focus, .inquiry-form textarea:focus { border-color: var(--cyan); }
.inquiry-form .button { width: 100%; border: 0; }
.form-status { min-height: 28px; margin: 14px 0 0; color: var(--amber); font-size: 13px; }

.site-footer { min-height: 210px; padding: 50px clamp(24px, 5vw, 86px); display: grid; grid-template-columns: 1fr 1fr auto; align-items: end; gap: 30px; border-top: 1px solid var(--line); background: #030607; }
.footer-brand { display: flex; align-items: center; gap: 16px; }
.footer-brand img { width: 34px; height: 34px; }
.footer-brand strong { font-family: Georgia, "Songti SC", "SimSun", serif; font-size: 26px; font-weight: 400; }
.footer-brand span, .footer-meta, .site-footer > a { color: var(--muted); font-size: 9px; letter-spacing: .16em; }
.footer-meta { display: flex; gap: 24px; }
.site-footer > a:hover, .site-footer > a:focus-visible { color: var(--cyan); }

@media (max-width: 980px) {
  .menu-toggle { position: relative; display: flex; align-items: center; gap: 8px; border: 0; background: none; color: var(--white); padding: 10px 0 10px 12px; }
  .menu-toggle span { font-size: 11px; letter-spacing: .16em; }
  .menu-toggle i { display: block; width: 18px; height: 1px; background: var(--cyan); transition: transform .2s ease; }
  .menu-toggle i:last-child { position: absolute; right: 0; transform: translateY(5px); }
  .menu-toggle[aria-expanded="true"] i:first-of-type { transform: rotate(45deg); }
  .menu-toggle[aria-expanded="true"] i:last-child { transform: translateY(0) rotate(-45deg); }
  .site-nav { position: absolute; top: 78px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 18px 24px 30px; background: rgba(6, 9, 11, .98); border-bottom: 1px solid var(--line); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 13px 0; border-bottom: 1px solid rgba(181, 229, 232, .1); }
  .site-nav .nav-contact { padding-left: 0; border-left: 0; }
  .hero-index { display: none; }
  .intro, .section-head, .application-head, .about { grid-template-columns: 1fr; }
  .intro { gap: 30px; }
  .section-head, .application-head { gap: 22px; }
  .product-row, .product-row-reverse { min-height: auto; grid-template-columns: 1fr; }
  .product-row-reverse .product-visual { order: 0; }
  .product-visual { min-height: 480px; }
  .product-copy, .product-row-reverse .product-copy { min-height: 430px; border-left: 0; border-right: 0; border-top: 1px solid var(--line); }
  .processing { grid-template-columns: 1fr; }
  .processing-media { min-height: 560px; }
  .process-line { grid-template-columns: 1fr; }
  .process-line div { min-height: 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .process-line div:last-child { border-right: 0; border-bottom: 0; }
  .process-line b { margin-bottom: 22px; }
  .development { min-height: auto; grid-template-columns: 1fr; }
  .development > img { min-height: 590px; }
  .contact { grid-template-columns: 1fr; }
  .site-footer { grid-template-columns: 1fr auto; }
  .footer-meta { grid-column: 1 / -1; order: 3; }
}

@media (max-width: 620px) {
  .site-header { min-height: 68px; }
  .brand-cn { font-size: 17px; }
  .brand-en { display: none; }
  .site-nav { top: 68px; }
  .hero { min-height: 860px; padding: 126px 24px 110px; align-items: flex-end; }
  .hero-media { object-position: 64% center; }
  .hero-shade { background: linear-gradient(180deg, rgba(3, 6, 8, .2), rgba(3, 6, 8, .92) 55%, #030608 100%); }
  h1 { font-size: clamp(48px, 15vw, 70px); }
  .hero-copy { font-size: 14px; }
  .hero-actions { flex-direction: column; }
  .scroll-cue { display: none; }
  .band, .products, .application-head, .application-boundary, .contact { width: min(calc(100% - 36px), var(--max)); }
  .intro { padding: 90px 0; }
  .intro-lead { font-size: 34px; }
  .products { padding: 100px 0; }
  .section-head { margin-bottom: 46px; }
  .section-head h2, .application-head h2, .processing-title-block h2, .development h2, .about h2, .contact h2 { font-size: 44px; }
  .product-visual { min-height: 320px; }
  .product-copy { min-height: 370px; padding: 36px 22px; }
  .product-copy h3 { font-size: 42px; }
  .processing-media { min-height: 380px; }
  .processing-title-block, .development-copy { padding: 70px 22px; }
  .process-line { padding: 0 22px; }
  .process-line div { padding: 34px 0; }
  .processing-detail { min-height: 360px; }
  .applications { padding: 100px 0; }
  .application-stage { width: 100%; height: 690px; }
  .application-label { left: 22px; right: auto; bottom: 34px; }
  .label-b { bottom: 100px; }
  .application-label strong { font-size: 18px; }
  .application-boundary { text-align: left; }
  .development > img { min-height: 420px; }
  .year-line { grid-template-columns: 1fr; margin-top: 50px; }
  .about { padding: 100px 0; }
  .contact { padding: 100px 0; }
  .field-pair { grid-template-columns: 1fr; gap: 0; }
  .site-footer { min-height: 250px; grid-template-columns: 1fr; align-items: start; }
  .footer-meta { grid-column: auto; flex-direction: column; gap: 8px; }
}

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