:root {
  --paper: #f4f2ed;
  --paper-bright: #fbfaf6;
  --ink: #111419;
  --ink-soft: #343a43;
  --muted: #686e76;
  --line: rgba(17, 20, 25, 0.18);
  --line-dark: rgba(255, 255, 255, 0.18);
  --cyan: #066a84;
  --cyan-bright: #55c8df;
  --coral: #b93c24;
  --max: 1320px;
  --header: 78px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Bahnschrift", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  caret-color: var(--cyan);
  scrollbar-color: var(--cyan) var(--paper);
}
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-underline-offset: .2em; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 4px; }
::selection { background: var(--cyan); color: #fff; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb { background: var(--cyan); border: 3px solid var(--paper); }

.skip-link {
  position: fixed;
  z-index: 1000;
  left: 18px;
  top: 12px;
  transform: translateY(-180%);
  background: var(--ink);
  color: #fff;
  padding: 10px 16px;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 0 max(28px, calc((100vw - var(--max)) / 2));
  background: color-mix(in srgb, var(--paper-bright) 94%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.site-brand, .footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-height: 48px;
}
.brand-mark { width: 38px; height: 38px; fill: none; stroke: currentColor; stroke-width: 2; }
.brand-mark circle { fill: var(--coral); stroke: none; }
.site-brand span { display: grid; gap: 1px; }
.site-brand strong { font-size: 14px; letter-spacing: .02em; }
.site-brand small { font-size: 8px; letter-spacing: .17em; color: var(--muted); }
.site-nav { display: flex; align-items: center; gap: clamp(16px, 2vw, 34px); }
.site-nav a { min-height: 44px; display: grid; place-items: center; text-decoration: none; font-size: 13px; color: var(--ink-soft); }
.site-nav a:hover { color: var(--cyan); }
.site-nav .nav-contact { background: var(--ink); color: #fff; padding-inline: 18px; }
.site-nav .nav-contact:hover { background: var(--cyan); color: #fff; }
.menu-toggle { display: none; }

.hero {
  min-height: calc(100svh - var(--header));
  display: grid;
  grid-template-columns: minmax(360px, .82fr) minmax(600px, 1.18fr);
  max-width: 1600px;
  margin-inline: auto;
  position: relative;
  background:
    linear-gradient(90deg, transparent 49.9%, var(--line) 50%, transparent 50.1%),
    var(--paper-bright);
}
.hero-copy {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(72px, 9vw, 140px) clamp(40px, 6vw, 100px);
}
.hero-register-line, .section-index, .datum, .form-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan);
}
.hero-register-line { display: flex; align-items: center; gap: 16px; margin-top: 24px; }
.hero-register-line span { color: var(--muted); }
.hero-register-line b { color: var(--cyan); }
.section-index { margin-top: 22px; }
.datum { margin-top: 18px; }
.form-kicker { margin-bottom: 26px; }
.hero h1, .section-head h2, .quality h2, .green h2, .about h2, .contact h2 {
  margin: 0;
  font-size: clamp(48px, 5.6vw, 92px);
  line-height: .98;
  letter-spacing: -.04em;
  font-weight: 700;
}
.hero h1 em { color: var(--cyan); font-style: normal; }
.hero-lead { max-width: 600px; margin: 36px 0 0; color: var(--ink-soft); font-size: clamp(16px, 1.35vw, 20px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border: 1px solid var(--ink);
  border-radius: 0;
  text-decoration: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
}
.button-dark { background: var(--ink); color: #fff; }
.button-dark:hover { background: var(--cyan); border-color: var(--cyan); }
.button-line { background: transparent; color: var(--ink); }
.button-line:hover { color: var(--cyan); border-color: var(--cyan); }
.hero-register { margin: auto 0 0; padding: 40px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; border-top: 1px solid var(--line); }
.hero-register div { display: grid; gap: 4px; }
.hero-register dt { font-size: 10px; letter-spacing: .13em; color: var(--muted); }
.hero-register dd { margin: 0; font-size: 13px; }
.hero-visual { margin: 0; min-height: 720px; position: relative; overflow: hidden; background: #efefed; }
.hero-visual img { height: 100%; object-fit: cover; object-position: center; }
.hero-visual figcaption { position: absolute; inset: auto 28px 28px auto; display: grid; gap: 4px; padding: 14px 16px; background: rgba(244, 242, 237, .92); border-left: 1px solid var(--coral); }
.hero-visual figcaption span { font-size: 9px; letter-spacing: .15em; color: var(--cyan); }
.hero-visual figcaption b { font-size: 12px; }
.hero-axis { position: absolute; right: calc(50% - 4px); bottom: 0; width: 8px; height: 40%; display: flex; flex-direction: column; align-items: center; justify-content: space-between; pointer-events: none; }
.hero-axis::before { content: ""; position: absolute; inset: 0 auto; width: 1px; background: linear-gradient(transparent, var(--coral)); }
.hero-axis span { width: 5px; height: 5px; background: var(--coral); border-radius: 50%; }
.hero-axis i { width: 8px; height: 1px; background: var(--coral); }

.record-strip { max-width: 1600px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); background: var(--ink); color: #fff; }
.record-strip div { min-height: 138px; padding: 30px clamp(24px, 3vw, 50px); border-right: 1px solid var(--line-dark); display: grid; align-content: center; gap: 5px; }
.record-strip div:last-child { border-right: 0; }
.record-strip b { font-size: 30px; color: var(--cyan-bright); letter-spacing: -.04em; }
.record-strip span { color: rgba(255,255,255,.72); font-size: 13px; }

.section-dark { color: #fff; background: var(--ink); }
.products { display: grid; grid-template-columns: .66fr 1.34fr; position: relative; }
.section-head { padding: clamp(80px, 9vw, 150px) clamp(30px, 6vw, 100px); display: flex; flex-direction: column; justify-content: center; }
.section-head h2, .quality h2, .green h2, .about h2, .contact h2 { font-size: clamp(42px, 4.8vw, 76px); }
.section-head > p:last-child { max-width: 590px; margin: 30px 0 0; color: var(--muted); }
.section-dark .section-head > p:last-child { color: rgba(255,255,255,.64); }
.product-visual { margin: 0; border-left: 1px solid var(--line-dark); overflow: hidden; }
.product-visual img { height: 100%; min-height: 640px; object-fit: cover; }
.product-lines { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line-dark); }
.product-lines article { min-height: 220px; padding: 34px clamp(28px, 4vw, 64px); border-right: 1px solid var(--line-dark); position: relative; }
.product-lines article:last-child { border-right: 0; }
.product-lines span { color: var(--coral); font-size: 11px; letter-spacing: .16em; }
.product-lines h3 { margin: 50px 0 8px; font-size: clamp(24px, 2.2vw, 36px); letter-spacing: -.035em; }
.product-lines p { margin: 0; color: rgba(255,255,255,.62); font-size: 14px; }

.manufacturing { background: var(--paper); }
.section-head-wide { max-width: var(--max); margin: auto; min-height: 620px; padding-left: 0; padding-right: 0; }
.section-head-wide > p:last-child { align-self: flex-end; width: min(46%, 560px); }
.feature-split { display: grid; grid-template-columns: 1.05fr .95fr; max-width: 1600px; margin: 0 auto; min-height: 720px; border-top: 1px solid var(--line); }
.feature-split figure { margin: 0; overflow: hidden; }
.feature-split figure img { height: 100%; object-fit: cover; }
.feature-copy { padding: clamp(70px, 9vw, 150px); display: flex; flex-direction: column; justify-content: center; }
.feature-copy h3, .assembly-copy h3 { margin: 0; font-size: clamp(38px, 4.3vw, 70px); line-height: 1.03; letter-spacing: -.04em; }
.feature-copy > p:not(.datum), .assembly-copy > p:not(.datum) { max-width: 560px; margin: 30px 0 0; color: var(--muted); }
.inline-specs { margin: 50px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); list-style: none; border-top: 1px solid var(--line); }
.inline-specs li { min-height: 56px; display: flex; align-items: center; border-bottom: 1px solid var(--line); font-size: 13px; }
.inline-specs li:nth-child(odd) { border-right: 1px solid var(--line); }
.inline-specs li:nth-child(even) { padding-left: 24px; }
.assembly-feature { position: relative; color: #fff; background: var(--ink); min-height: 800px; overflow: hidden; }
.assembly-feature figure { margin: 0; position: absolute; inset: 0; }
.assembly-feature figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(9,12,16,.97) 0 36%, rgba(9,12,16,.46) 66%, rgba(9,12,16,.1)); }
.assembly-feature img { height: 100%; object-fit: cover; }
.assembly-copy { position: relative; z-index: 1; max-width: 650px; padding: clamp(90px, 10vw, 170px) clamp(34px, 7vw, 120px); }
.assembly-copy > p:not(.datum) { color: rgba(255,255,255,.7); }
.process-line { position: absolute; z-index: 1; inset: auto 0 0; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); list-style: none; border-top: 1px solid var(--line-dark); background: rgba(9,12,16,.82); }
.process-line li { min-height: 130px; padding: 28px; border-right: 1px solid var(--line-dark); display: grid; align-content: space-between; }
.process-line b { color: var(--cyan-bright); font-size: 12px; letter-spacing: .14em; }
.process-line span { font-size: 14px; }
.electronics-feature { grid-template-columns: .8fr 1.2fr; }
.text-link { margin-top: 38px; align-self: flex-start; min-height: 44px; display: inline-flex; align-items: center; gap: 12px; text-decoration: none; border-bottom: 1px solid var(--ink); font-weight: 700; }
.text-link:hover { color: var(--cyan); border-color: var(--cyan); }

.quality { min-height: 780px; display: grid; grid-template-columns: 1.15fr .85fr; }
.quality-visual { margin: 0; overflow: hidden; }
.quality-visual img { height: 100%; object-fit: cover; }
.quality-copy { padding: clamp(80px, 8vw, 140px); display: flex; flex-direction: column; justify-content: center; }
.quality-copy > p:not(.section-index) { margin: 30px 0 0; color: rgba(255,255,255,.66); }
.quality-copy dl { margin: 56px 0 0; border-top: 1px solid var(--line-dark); }
.quality-copy dl div { display: grid; grid-template-columns: 90px 1fr; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--line-dark); }
.quality-copy dt { color: var(--cyan-bright); font-size: 11px; letter-spacing: .15em; }
.quality-copy dd { margin: 0; font-size: 14px; color: rgba(255,255,255,.76); }

.packaging { display: grid; grid-template-columns: .62fr 1.38fr; background: var(--paper-bright); }
.packaging-visual { margin: 0; overflow: hidden; }
.packaging-visual img { height: 100%; min-height: 660px; object-fit: cover; }
.packaging-notes { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.packaging-notes span { min-height: 120px; padding: 30px clamp(26px, 4vw, 62px); border-right: 1px solid var(--line); display: flex; gap: 22px; align-items: center; color: var(--muted); font-size: 13px; }
.packaging-notes span:last-child { border-right: 0; }
.packaging-notes b { color: var(--cyan); text-transform: uppercase; letter-spacing: .12em; font-size: 11px; }

.green { display: grid; grid-template-columns: 1.08fr .92fr; min-height: 820px; background: #e6ece9; }
.green-visual { margin: 0; position: relative; overflow: hidden; }
.green-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 60%, rgba(230,236,233,.88)); }
.green-visual img { height: 100%; object-fit: cover; }
.green-copy { padding: clamp(80px, 8vw, 140px); align-self: center; }
.green-record { display: grid; grid-template-columns: 86px 1fr; gap: 26px; padding: 26px 0; border-top: 1px solid var(--line); }
.green-record:first-of-type { margin-top: 50px; }
.green-record:last-of-type { border-bottom: 1px solid var(--line); }
.green-record time { color: var(--cyan); font-size: 28px; font-weight: 700; letter-spacing: -.04em; }
.green-record p { margin: 0; display: grid; gap: 8px; }
.green-record strong { font-size: 16px; }
.green-record span, .boundary-note { color: var(--muted); font-size: 13px; }
.boundary-note { margin: 24px 0 0; }

.about { min-height: 620px; display: grid; grid-template-columns: .85fr .75fr .4fr; max-width: var(--max); margin: auto; align-items: center; position: relative; }
.about-title { padding-right: 80px; }
.about-copy { padding: 80px; border-left: 1px solid var(--line); }
.about-copy p { margin: 0; color: var(--muted); }
.about-copy address { margin-top: 40px; padding-top: 40px; border-top: 1px solid var(--line); font-style: normal; font-weight: 700; }
.about-axis { align-self: stretch; display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; }
.about-axis::before { content: ""; position: absolute; top: 0; bottom: 0; width: 1px; background: var(--line); }
.about-axis span { position: relative; width: 12px; height: 12px; border: 2px solid var(--cyan); background: var(--paper); border-radius: 50%; margin: 70px 0; }
.about-axis i { position: relative; width: 30px; height: 1px; background: var(--coral); }

.contact { display: grid; grid-template-columns: 1.1fr .9fr; color: #fff; background: var(--ink); }
.contact-info { padding: clamp(80px, 9vw, 150px) clamp(34px, 7vw, 120px); }
.contact-info > p:not(.section-index) { max-width: 620px; color: rgba(255,255,255,.66); margin: 30px 0 0; }
.official-links { margin-top: 60px; border-top: 1px solid var(--line-dark); }
.official-links a { min-height: 116px; display: grid; grid-template-columns: 120px 1fr; align-items: center; gap: 8px 28px; padding: 22px 0; text-decoration: none; border-bottom: 1px solid var(--line-dark); }
.official-links a:hover b { color: var(--cyan-bright); }
.official-links span { grid-row: 1 / 3; color: var(--cyan-bright); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; }
.official-links b { font-size: 18px; }
.official-links small { color: rgba(255,255,255,.55); }
.contact-form { background: var(--paper-bright); color: var(--ink); padding: clamp(80px, 8vw, 130px); display: flex; flex-direction: column; justify-content: center; }
.contact-form label { margin: 18px 0 8px; font-size: 12px; letter-spacing: .08em; }
.contact-form input, .contact-form select, .contact-form textarea { width: 100%; border: 0; border-bottom: 1px solid var(--ink); border-radius: 0; background: transparent; color: var(--ink); padding: 12px 2px; min-height: 48px; }
.contact-form textarea { border: 1px solid var(--ink); padding: 14px; resize: vertical; }
.contact-form .button { align-self: flex-start; margin-top: 28px; }
.form-status { min-height: 28px; margin: 18px 0 0; color: var(--coral); font-weight: 700; font-size: 13px; }

.site-footer { min-height: 180px; max-width: 1600px; margin: auto; padding: 44px clamp(28px, 5vw, 80px); display: flex; align-items: center; justify-content: space-between; gap: 36px; border-top: 1px solid var(--line); background: var(--paper-bright); }
.footer-meta { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 16px 32px; color: var(--muted); font-size: 11px; }
.footer-meta p { margin: 0; }
.creative-note { color: var(--ink); }

@media (max-width: 1080px) {
  .site-nav { gap: 14px; }
  .hero { grid-template-columns: .85fr 1.15fr; }
  .hero-copy { padding-inline: 38px; }
  .products, .packaging { grid-template-columns: .8fr 1.2fr; }
  .feature-copy, .quality-copy, .green-copy, .contact-form { padding: 70px 54px; }
  .section-head-wide { padding-inline: 36px; }
  .about { padding-left: 36px; }
}

@media (max-width: 820px) {
  :root { --header: 68px; }
  .site-header { padding: 0 20px; }
  .site-header { backdrop-filter: none; }
  .site-brand strong { font-size: 12px; }
  .site-brand small { display: none; }
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-width: 70px;
    min-height: 44px;
    padding: 0;
    color: var(--ink);
    background: transparent;
    border: 0;
    cursor: pointer;
  }
  .menu-toggle span { font-size: 13px; font-weight: 700; }
  .menu-toggle i, .menu-toggle i::before { display: block; width: 20px; height: 1px; background: currentColor; transition: transform .2s ease; }
  .menu-toggle i { position: relative; }
  .menu-toggle i::before { content: ""; position: absolute; top: 6px; }
  .menu-toggle[aria-expanded="true"] i { transform: rotate(45deg); }
  .menu-toggle[aria-expanded="true"] i::before { top: 0; transform: rotate(90deg); }
  .site-nav {
    position: fixed;
    inset: var(--header) 0 0;
    height: calc(100dvh - var(--header));
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 34px 24px 60px;
    background: rgba(17,20,25,.985);
    color: #fff;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
  }
  .site-nav[data-open="true"] { visibility: visible; opacity: 1; pointer-events: auto; }
  .site-nav a { min-height: 64px; justify-content: start; color: #fff; font-size: 22px; font-weight: 700; border-bottom: 1px solid var(--line-dark); }
  .site-nav .nav-contact { margin-top: 22px; padding-inline: 20px; background: var(--coral); border: 0; }

  .hero { min-height: auto; display: flex; flex-direction: column; background: var(--paper-bright); }
  .hero-copy { min-height: 670px; padding: 84px 24px 44px; }
  .hero h1 { font-size: clamp(50px, 14vw, 74px); }
  .hero-lead { margin-top: 26px; }
  .hero-register { margin-top: 70px; gap: 12px; }
  .hero-register dd { font-size: 11px; }
  .hero-visual { min-height: 540px; }
  .hero-axis { display: none; }
  .record-strip { grid-template-columns: repeat(2, 1fr); }
  .record-strip div { min-height: 120px; border-bottom: 1px solid var(--line-dark); }

  .products, .packaging, .quality, .green, .contact { grid-template-columns: 1fr; }
  .section-head { padding: 84px 24px 64px; }
  .section-head h2, .quality h2, .green h2, .about h2, .contact h2 { font-size: clamp(42px, 11vw, 62px); }
  .product-visual { border-left: 0; border-top: 1px solid var(--line-dark); }
  .product-visual img { min-height: 480px; }
  .product-lines { grid-template-columns: 1fr; }
  .product-lines article { min-height: 170px; border-right: 0; border-bottom: 1px solid var(--line-dark); }
  .product-lines h3 { margin-top: 28px; }
  .section-head-wide { min-height: 560px; padding: 90px 24px; }
  .section-head-wide > p:last-child { align-self: auto; width: auto; }
  .feature-split { grid-template-columns: 1fr; min-height: auto; }
  .feature-split figure { min-height: 460px; }
  .shell-feature .feature-copy { order: -1; }
  .feature-copy { padding: 82px 24px; }
  .assembly-feature { min-height: 940px; }
  .assembly-feature figure::after { background: linear-gradient(180deg, rgba(9,12,16,.97) 0 42%, rgba(9,12,16,.25) 78%, rgba(9,12,16,.9)); }
  .assembly-copy { padding: 82px 24px; }
  .process-line { grid-template-columns: repeat(2, 1fr); }
  .process-line li { min-height: 90px; padding: 18px 20px; }
  .process-line li:last-child { grid-column: 1 / -1; }
  .electronics-feature .feature-copy { order: -1; }
  .quality-visual { min-height: 520px; }
  .quality-copy, .green-copy, .contact-info, .contact-form { padding: 82px 24px; }
  .packaging-visual img { min-height: 520px; }
  .packaging-notes { grid-template-columns: 1fr; }
  .packaging-notes span { min-height: 90px; border-right: 0; border-bottom: 1px solid var(--line); }
  .green-visual { min-height: 540px; }
  .green-visual::after { background: linear-gradient(180deg, transparent 60%, rgba(230,236,233,.8)); }
  .about { grid-template-columns: 1fr; padding: 90px 24px; }
  .about-title { padding: 0; }
  .about-copy { padding: 54px 0 0; margin-top: 54px; border-left: 0; border-top: 1px solid var(--line); }
  .about-axis { display: none; }
  .official-links a { grid-template-columns: 96px 1fr; }
  .site-footer { align-items: flex-start; flex-direction: column; padding: 44px 24px; }
  .footer-meta { justify-content: flex-start; flex-direction: column; gap: 8px; }
}

@media (max-width: 480px) {
  .site-brand .brand-mark { width: 30px; height: 30px; }
  .site-brand strong { max-width: 172px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .hero-copy { min-height: 620px; }
  .hero h1 { font-size: 52px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-register { grid-template-columns: 1fr 1fr; }
  .hero-register div:last-child { grid-column: 1 / -1; }
  .hero-visual { min-height: 440px; }
  .record-strip b { font-size: 26px; }
  .record-strip span { font-size: 11px; }
  .product-visual img, .feature-split figure, .quality-visual, .packaging-visual img, .green-visual { min-height: 400px; }
  .inline-specs { grid-template-columns: 1fr; }
  .inline-specs li:nth-child(odd) { border-right: 0; }
  .inline-specs li:nth-child(even) { padding-left: 0; }
  .green-record { grid-template-columns: 70px 1fr; gap: 14px; }
  .green-record time { font-size: 23px; }
  .official-links a { grid-template-columns: 1fr; gap: 6px; padding: 24px 0; }
  .official-links span { grid-row: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .menu-toggle i, .menu-toggle i::before { transition: none; }
}