:root {
  --navy: #071b2c;
  --navy-2: #0d2b44;
  --paper: #f3f5f3;
  --white: #ffffff;
  --ink: #0c1c28;
  --steel: #9baab5;
  --line: rgba(12, 28, 40, 0.2);
  --light-line: rgba(255, 255, 255, 0.22);
  --orange: #a93600;
  --orange-bright: #ff8a46;
  --sky: #a8cce7;
  --sans: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  --mono: Consolas, "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  overflow-x: hidden;
}
body.menu-open { overflow: hidden; }
a { color: inherit; }
img { display: block; width: 100%; height: auto; }
button, input, textarea { font: inherit; }

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 4px;
}

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

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4vw;
  color: var(--white);
  background: rgba(7, 27, 44, 0.96);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  transition: background 220ms ease, height 220ms ease, box-shadow 220ms ease;
}
.site-header.is-scrolled {
  height: 70px;
  background: rgba(7, 27, 44, 0.96);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.16);
}
.brand { min-height: 44px; display: inline-flex; align-items: center; gap: 12px; text-decoration: none; z-index: 3; }
.brand-mark { width: 42px; height: 42px; flex: none; }
.brand-copy { display: grid; line-height: 1.1; }
.brand-copy strong { font-size: 17px; letter-spacing: 0.12em; }
.brand-copy small { margin-top: 6px; font: 9px/1 var(--mono); letter-spacing: 0.12em; color: #c8d5dd; }
.site-nav { display: flex; align-items: center; gap: clamp(20px, 2.5vw, 42px); }
.site-nav a {
  position: relative;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: #eaf1f5;
  font-size: 14px;
  text-decoration: none;
}
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 5px; height: 2px; background: var(--orange); transition: right 180ms ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { right: 0; }
.menu-toggle { display: none; }

.hero {
  position: relative;
  min-height: 840px;
  height: 100svh;
  overflow: hidden;
  display: grid;
  align-items: end;
  color: var(--white);
  background: var(--navy);
}
.hero-media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(4, 17, 29, 0.92) 0%, rgba(4, 17, 29, 0.62) 42%, rgba(4, 17, 29, 0.12) 72%), linear-gradient(0deg, rgba(4, 17, 29, 0.65), transparent 44%); }
.hero-copy { position: relative; z-index: 1; padding: 0 4vw 10vh; max-width: 900px; }
.eyebrow, .section-code { margin: 0 0 24px; color: var(--orange); font: 700 11px/1.3 var(--mono); letter-spacing: 0.18em; }
.eyebrow { color: var(--orange-bright); }
.hero h1 { margin: 0; max-width: 850px; font-size: clamp(58px, 7vw, 116px); line-height: 0.98; letter-spacing: -0.065em; }
.hero h1 em { color: #d8e3e9; font-style: normal; font-weight: 400; }
.hero-lede { max-width: 650px; margin: 34px 0 28px; color: #d8e3e9; font-size: clamp(16px, 1.5vw, 21px); }
.hero-link, .text-link { min-height: 44px; display: inline-flex; align-items: center; gap: 24px; font-weight: 700; text-decoration: none; border-bottom: 1px solid currentColor; }
.hero-link span, .text-link span { color: var(--orange-bright); }
.hero-index {
  position: absolute;
  z-index: 2;
  right: 4vw;
  bottom: 9vh;
  width: min(340px, 30vw);
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.35);
}
.hero-index div { display: grid; grid-template-columns: 90px 1fr; gap: 12px; padding: 13px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.2); }
.hero-index dt { color: #a9bbc8; font: 10px/1.6 var(--mono); }
.hero-index dd { margin: 0; text-align: right; font-size: 14px; }
.force-axis { position: absolute; z-index: 1; left: 4vw; right: 4vw; bottom: 3vh; display: flex; align-items: center; gap: 12px; color: #a9bbc8; font: 9px/1 var(--mono); letter-spacing: 0.14em; }
.force-axis i { height: 1px; flex: 1; background: rgba(255, 255, 255, 0.25); }

.section-heading, .connection-heading { display: grid; grid-template-columns: 1fr 1.7fr 1fr; gap: 4vw; align-items: start; padding: 130px 4vw 70px; border-bottom: 1px solid var(--line); }
.section-heading h2, .connection-heading h2, .path-heading h2, .quality h2, .green h2, .contact h2 { margin: 0; font-size: clamp(42px, 5.2vw, 82px); line-height: 1.02; letter-spacing: -0.055em; }
.section-heading > p:last-child, .connection-heading > p:last-child { margin: 8px 0 0; font-size: 16px; color: #405361; }

.family-line { display: grid; grid-template-columns: repeat(4, 1fr); border-bottom: 1px solid var(--line); }
.family-line article { min-height: 290px; padding: 36px 3vw 44px; border-right: 1px solid var(--line); }
.family-line article:last-child { border-right: 0; }
.family-line span { font: 700 11px/1 var(--mono); color: var(--orange); }
.family-line h3 { margin: 72px 0 12px; font-size: 26px; }
.family-line p { margin: 0; color: #4b5d69; }
.material-field { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.7fr); margin: 0; min-height: 620px; }
.material-field img { height: 100%; object-fit: cover; }
.material-field figcaption { display: flex; flex-direction: column; justify-content: flex-end; padding: 58px 4vw; background: #dce3e5; }
.material-field figcaption span { font: 11px/1 var(--mono); letter-spacing: 0.15em; color: #465965; }
.material-field figcaption strong { margin-top: 24px; font-size: clamp(34px, 4vw, 62px); letter-spacing: -0.04em; }
.material-field figcaption p { margin: 24px 0 0; color: #405361; }

.manufacturing-path { background: var(--navy); color: var(--white); }
.path-heading { display: grid; grid-template-columns: 1fr 1.7fr 1fr; gap: 4vw; padding: 130px 4vw 90px; border-bottom: 1px solid var(--light-line); }
.section-code--light { color: var(--orange-bright); }
.path-heading > p:last-child { margin: 8px 0 0; color: #b7c7d1; }
.path-stage { display: grid; grid-template-columns: 1.7fr 0.7fr; min-height: 630px; border-bottom: 1px solid var(--light-line); }
.path-stage--heat { grid-template-columns: 0.7fr 1.7fr; }
.path-stage figure { margin: 0; overflow: hidden; }
.path-stage img { height: 100%; object-fit: cover; }
.stage-copy { display: flex; flex-direction: column; justify-content: flex-end; padding: 60px 4vw; }
.stage-copy span { color: var(--orange-bright); font: 11px/1 var(--mono); }
.stage-copy h3 { margin: 120px 0 18px; font-size: clamp(44px, 6vw, 92px); line-height: 0.9; }
.stage-copy p { margin: 0; color: #b7c7d1; }
.protection-spread { display: grid; grid-template-columns: minmax(340px, 0.9fr) minmax(0, 1.1fr); min-height: 720px; }
.protection-spread figure { margin: 0; padding: 6vw; background: #04121f; }
.protection-spread img { height: 100%; object-fit: cover; }
.protection-copy { display: flex; flex-direction: column; justify-content: center; padding: 7vw; background: var(--navy-2); }
.protection-copy h3 { margin: 0 0 30px; font-size: clamp(40px, 5vw, 76px); line-height: 1; letter-spacing: -0.05em; }
.protection-copy p { max-width: 650px; color: #c4d0d7; }
.text-link--light { margin-top: 28px; color: var(--white); align-self: flex-start; }
.text-link--light span { color: var(--orange-bright); }

.connection { background: var(--paper); }
.exploded { margin: 0; padding: 6vw 4vw 0; }
.exploded img { min-height: 420px; object-fit: cover; }
.exploded figcaption { display: grid; grid-template-columns: repeat(6, 1fr); border-bottom: 1px solid var(--line); }
.exploded figcaption span { position: relative; padding: 22px 8px 30px; text-align: center; color: #536571; font: 11px/1.3 var(--mono); border-right: 1px solid var(--line); }
.exploded figcaption span::before { content: ""; position: absolute; left: 50%; top: -18px; width: 1px; height: 18px; background: var(--orange); }
.exploded figcaption span:last-child { border-right: 0; }
.brief-rail { list-style: none; margin: 0; padding: 90px 4vw 130px; display: grid; grid-template-columns: repeat(5, 1fr); }
.brief-rail li { min-height: 230px; padding: 28px 2vw; border-top: 2px solid var(--navy); border-right: 1px solid var(--line); }
.brief-rail li:last-child { border-right: 0; }
.brief-rail span { color: var(--orange); font: 11px/1 var(--mono); }
.brief-rail strong { display: block; margin: 66px 0 10px; font-size: 19px; }
.brief-rail p { margin: 0; color: #586a76; font-size: 14px; }

.quality { display: grid; grid-template-columns: 1fr 1fr; min-height: 780px; background: #061725; color: var(--white); }
.quality-media { min-width: 0; }
.quality-media img { height: 100%; object-fit: cover; }
.quality-copy { display: flex; flex-direction: column; justify-content: center; padding: 7vw; }
.quality-copy > p:not(.section-code) { color: #c4d0d7; margin: 34px 0 48px; }
.quality blockquote { margin: 0; padding: 32px 0 0; border-top: 1px solid var(--light-line); display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 30px; }
.quality blockquote strong { color: var(--orange-bright); font: 700 clamp(34px, 4vw, 64px)/1 var(--mono); }
.quality blockquote span { color: #c4d0d7; font-size: 14px; }

.green { position: relative; min-height: 820px; display: grid; align-items: end; color: var(--white); background: var(--navy); }
.green figure { position: absolute; inset: 0; margin: 0; }
.green figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7, 27, 44, 0.9), rgba(7, 27, 44, 0.28) 68%), linear-gradient(0deg, rgba(7, 27, 44, 0.65), transparent 50%); }
.green img { height: 100%; object-fit: cover; }
.green-copy { position: relative; z-index: 1; max-width: 780px; padding: 0 4vw 8vw; }
.green-copy .section-code { color: var(--orange-bright); }
.green-copy > p:not(.section-code) { color: #d4dee4; font-size: 18px; max-width: 650px; }
.green-note { display: grid; grid-template-columns: 150px 1fr; gap: 12px 30px; margin-top: 42px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.35); }
.green-note span { color: #a9bbc8; font: 10px/1.5 var(--mono); }
.green-note strong { font-size: 21px; }
.green-note small { grid-column: 2; color: #a9bbc8; }

.contact { display: grid; grid-template-columns: 1fr 1fr; background: var(--navy); color: var(--white); border-top: 1px solid var(--light-line); }
.contact-intro { padding: 120px 6vw 110px 4vw; border-right: 1px solid var(--light-line); }
.contact-intro > p:not(.section-code) { margin: 32px 0 50px; max-width: 620px; color: #c4d0d7; }
.contact address { display: grid; gap: 10px; font-style: normal; padding-top: 30px; border-top: 1px solid var(--light-line); }
.contact address span { margin-bottom: 8px; color: #ff9b5c; font: 11px/1.3 var(--mono); letter-spacing: .12em; }
.contact address a { min-height: 44px; display: flex; align-items: center; width: fit-content; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.contact address p { margin: 4px 0 0; color: #9eb0bc; }
.inquiry-form { padding: 120px 4vw 110px 6vw; display: flex; flex-direction: column; justify-content: center; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.inquiry-form label { display: grid; gap: 9px; margin-bottom: 24px; color: #b8c6cf; font-size: 13px; }
.inquiry-form input, .inquiry-form textarea { width: 100%; min-height: 48px; border: 0; border-bottom: 1px solid #597080; border-radius: 0; background: transparent; color: var(--white); padding: 10px 0; resize: vertical; }
.inquiry-form input:focus, .inquiry-form textarea:focus { border-bottom-color: var(--orange); outline: 0; }
.inquiry-form textarea::placeholder { color: #8095a2; }
.inquiry-form button { min-height: 56px; border: 0; background: var(--orange-bright); color: #111; font-weight: 800; padding: 0 22px; display: flex; align-items: center; justify-content: space-between; cursor: pointer; }
.inquiry-form button:hover { background: #ff7c2c; }
.form-status { min-height: 26px; margin: 14px 0 0; color: #ffd4ba; font-size: 14px; }

.site-footer { background: #03101b; color: #b7c7d1; padding: 70px 4vw 30px; }
.footer-brand { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: 46px; border-bottom: 1px solid var(--light-line); }
.footer-brand strong { color: var(--white); font-size: clamp(42px, 7vw, 100px); line-height: 1; letter-spacing: -0.06em; }
.footer-brand span { max-width: 320px; text-align: right; }
.site-footer nav { display: flex; gap: 34px; margin: 34px 0 60px; }
.site-footer nav a { min-height: 44px; display: flex; align-items: center; font-size: 13px; }
.footer-meta { display: flex; justify-content: space-between; color: #7f939f; font: 10px/1.5 var(--mono); }

[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 700ms ease, transform 700ms ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (max-width: 1000px) {
  .section-heading, .connection-heading, .path-heading { grid-template-columns: .7fr 1.5fr; }
  .section-heading > p:last-child, .connection-heading > p:last-child, .path-heading > p:last-child { grid-column: 2; }
  .family-line { grid-template-columns: repeat(2, 1fr); }
  .family-line article:nth-child(2) { border-right: 0; }
  .family-line article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .brief-rail { grid-template-columns: repeat(5, minmax(160px, 1fr)); overflow-x: auto; }
}

@media (max-width: 860px) {
  .site-header { height: 68px; padding: 0 20px; background: rgba(7, 27, 44, 0.94); }
  .brand-mark { width: 36px; height: 36px; }
  .brand-copy strong { font-size: 15px; }
  .brand-copy small { font-size: 7px; }
  .menu-toggle { position: relative; z-index: 5; display: grid; place-content: center; gap: 7px; width: 48px; height: 48px; padding: 0; border: 0; background: transparent; color: var(--white); }
  .menu-toggle span { display: block; width: 26px; height: 2px; background: currentColor; transition: transform 180ms ease; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.5px) rotate(-45deg); }
  .site-nav { position: fixed; z-index: 4; inset: 0; display: flex; flex-direction: column; justify-content: center; align-items: stretch; gap: 0; padding: 96px 28px 40px; background: var(--navy); opacity: 0; visibility: hidden; transform: translateY(-10px); transition: opacity 180ms ease, transform 180ms ease, visibility 180ms; }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: none; }
  .site-nav a { min-height: 64px; font-size: 24px; border-bottom: 1px solid var(--light-line); }
  .site-nav a::after { display: none; }
  .hero { min-height: 760px; }
  .hero-media { object-position: 64% center; }
  .hero-overlay { background: linear-gradient(90deg, rgba(4, 17, 29, .94), rgba(4,17,29,.42)), linear-gradient(0deg, rgba(4,17,29,.84), transparent 55%); }
  .hero-copy { padding: 0 24px 170px; }
  .hero h1 { font-size: clamp(48px, 12vw, 74px); }
  .hero-lede { font-size: 16px; }
  .hero-index { left: 24px; right: 24px; bottom: 55px; width: auto; display: grid; grid-template-columns: repeat(3, 1fr); }
  .hero-index div { display: block; padding: 10px; border-right: 1px solid rgba(255,255,255,.2); }
  .hero-index div:last-child { border-right: 0; }
  .hero-index dd { margin-top: 6px; text-align: left; font-size: 11px; }
  .force-axis { display: none; }
  .section-heading, .connection-heading, .path-heading { display: block; padding: 90px 24px 54px; }
  .section-heading > p:last-child, .connection-heading > p:last-child, .path-heading > p:last-child { margin-top: 28px; }
  .family-line article { min-height: 230px; padding: 28px 24px 34px; }
  .family-line h3 { margin-top: 54px; }
  .material-field { grid-template-columns: 1fr; min-height: 0; }
  .material-field img { height: 440px; }
  .material-field figcaption { min-height: 300px; padding: 44px 24px; }
  .path-stage, .path-stage--heat { grid-template-columns: 1fr; min-height: 0; }
  .path-stage--heat .stage-copy { order: 2; }
  .path-stage figure { min-height: 420px; }
  .stage-copy { min-height: 300px; padding: 44px 24px; }
  .stage-copy h3 { margin-top: 60px; }
  .protection-spread { grid-template-columns: 1fr; min-height: 0; }
  .protection-spread figure { padding: 50px 24px; }
  .protection-spread img { max-height: 620px; object-fit: cover; }
  .protection-copy { padding: 70px 24px; }
  .exploded { padding: 50px 0 0; overflow: hidden; }
  .exploded img { min-height: 360px; width: 125%; max-width: none; transform: translateX(-10%); }
  .exploded figcaption { grid-template-columns: repeat(3, 1fr); margin: 0 24px; }
  .exploded figcaption span:nth-child(3) { border-right: 0; }
  .exploded figcaption span:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
  .brief-rail { padding: 70px 24px 90px; }
  .quality { grid-template-columns: 1fr; min-height: 0; }
  .quality-media img { height: 620px; }
  .quality-copy { padding: 80px 24px; }
  .green { min-height: 760px; }
  .green-copy { padding: 0 24px 70px; }
  .contact { grid-template-columns: 1fr; }
  .contact-intro, .inquiry-form { padding: 80px 24px; border-right: 0; border-bottom: 1px solid var(--light-line); }
  .footer-brand { display: block; }
  .footer-brand span { display: block; margin-top: 24px; text-align: left; }
}

@media (max-width: 560px) {
  .hero { height: auto; min-height: 780px; }
  .eyebrow, .section-code { margin-bottom: 18px; }
  .hero-copy { padding-bottom: 202px; }
  .hero-index { grid-template-columns: 1fr; bottom: 24px; }
  .hero-index div { display: grid; grid-template-columns: 86px 1fr; padding: 7px 0; border-right: 0; }
  .hero-index dd { margin-top: 0; text-align: right; }
  .section-heading h2, .connection-heading h2, .path-heading h2, .quality h2, .green h2, .contact h2 { font-size: clamp(38px, 11vw, 54px); }
  .family-line { grid-template-columns: 1fr; }
  .family-line article { border-right: 0; border-bottom: 1px solid var(--line); }
  .family-line article:last-child { border-bottom: 0; }
  .material-field img, .path-stage figure { height: 330px; min-height: 0; }
  .protection-spread figure { padding: 32px 24px; }
  .exploded img { min-height: 300px; }
  .quality-media img { height: 460px; }
  .quality blockquote { grid-template-columns: 1fr; }
  .green-note { grid-template-columns: 1fr; }
  .green-note small { grid-column: auto; }
  .field-row { grid-template-columns: 1fr; gap: 0; }
  .site-footer nav { flex-wrap: wrap; gap: 8px 24px; }
  .footer-meta { display: grid; gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}