:root {
  --red: #b9332d;
  --red-bright: #d94337;
  --red-dark: #7d211e;
  --ink: #181514;
  --carbon: #241b1a;
  --brown: #3a2b29;
  --paper: #f4f1ea;
  --paper-deep: #e8e2d8;
  --white: #fffdf8;
  --silver: #c8c5c0;
  --muted: #746e69;
  --line: rgba(24, 21, 20, 0.14);
  --red-line: rgba(185, 51, 45, 0.22);
  --shadow: 0 24px 70px rgba(29, 19, 17, 0.16);
  --shell: min(1240px, calc(100vw - 64px));
  --header-height: 88px;
  --ease: cubic-bezier(.2, .72, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
::selection { color: var(--white); background: var(--red); }

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 14px;
  color: #fff;
  background: var(--red);
  transform: translateY(-150%);
  transition: transform .2s;
}

.skip-link:focus { transform: none; }

.shell { width: var(--shell); margin-inline: auto; }
.section { padding: 126px 0; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  color: rgba(255, 255, 255, .72);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.eyebrow span { color: #fff; }
.eyebrow::before { width: 34px; height: 2px; content: ""; background: var(--red-bright); }
.eyebrow-dark { color: var(--muted); }
.eyebrow-dark span { color: var(--red); }

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.15; }
h1 em, h2 em { color: var(--red); font-style: normal; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-height);
  color: var(--ink);
  background: rgba(255, 253, 248, .96);
  border-bottom: 1px solid rgba(24, 21, 20, .08);
  transition: height .3s var(--ease), box-shadow .3s var(--ease), background .3s;
  backdrop-filter: blur(14px);
}

.site-header.is-scrolled {
  height: 72px;
  box-shadow: 0 10px 34px rgba(20, 15, 14, .08);
  background: rgba(255, 253, 248, .98);
}

.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 40px; }

.brand { display: flex; align-items: center; gap: 14px; min-width: 0; }
.brand > img { width: 154px; height: auto; object-fit: contain; flex: none; }
.brand-name { display: flex; flex-direction: column; line-height: 1.2; white-space: nowrap; }
.brand-name strong { font-size: 13px; letter-spacing: .02em; }
.brand-name small { margin-top: 5px; color: #857c77; font-size: 8px; letter-spacing: .08em; }

.site-nav { height: 100%; display: flex; align-items: center; gap: 30px; }
.site-nav a { position: relative; font-size: 14px; font-weight: 600; white-space: nowrap; }
.site-nav a:not(.nav-contact)::after {
  position: absolute;
  right: 0;
  bottom: -10px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--red);
  transform: scaleX(0);
  transition: transform .25s var(--ease);
  transform-origin: right;
}
.site-nav a:hover::after, .site-nav a.is-active::after { transform: scaleX(1); transform-origin: left; }
.nav-contact { display: inline-flex; align-items: center; gap: 18px; padding: 11px 16px; color: #fff; background: var(--ink); }
.nav-contact:hover { background: var(--red); }

.nav-toggle { display: none; width: 48px; height: 48px; border: 0; background: transparent; }
.nav-toggle span { display: block; width: 24px; height: 2px; margin: 5px auto; background: var(--ink); transition: transform .25s, opacity .2s; }

.hero {
  position: relative;
  min-height: 930px;
  padding-top: var(--header-height);
  color: #fff;
  background:
    radial-gradient(circle at 76% 42%, rgba(185, 51, 45, .25), transparent 33%),
    linear-gradient(112deg, #171313 0%, #211918 52%, #321f1d 100%);
  overflow: hidden;
}

.hero::after {
  position: absolute;
  inset: var(--header-height) 0 0 auto;
  width: 38%;
  content: "";
  background: linear-gradient(180deg, rgba(255,255,255,.025), transparent 40%);
  border-left: 1px solid rgba(255,255,255,.08);
}

.hero-grid {
  position: absolute;
  inset: var(--header-height) 0 0;
  opacity: .17;
  background-image:
    linear-gradient(rgba(255,255,255,.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.16) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(to right, transparent, #000 55%, #000);
}

.hero-orbit { position: absolute; border: 1px solid rgba(255, 255, 255, .12); border-radius: 50%; }
.hero-orbit-one { top: 190px; right: -190px; width: 720px; height: 720px; }
.hero-orbit-two { top: 300px; right: -80px; width: 500px; height: 500px; border-color: rgba(185,51,45,.32); }

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, .94fr) minmax(460px, .8fr);
  align-items: center;
  gap: 70px;
  min-height: 730px;
  padding-block: 78px 120px;
}

.hero-copy { max-width: 690px; }
.hero-copy h1 { margin-bottom: 28px; font-size: clamp(56px, 5.8vw, 90px); font-weight: 800; letter-spacing: -.06em; }
.hero-copy h1 em { color: #fff; background: linear-gradient(90deg, var(--red-bright) 0 17%, #fff 17%); background-clip: text; -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero-lead { max-width: 640px; margin-bottom: 34px; color: rgba(255,255,255,.69); font-size: 17px; line-height: 1.95; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 12px 24px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 700;
  transition: background .25s, color .25s, border-color .25s, transform .25s;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: var(--red); }
.button-primary:hover { background: var(--red-bright); }
.button-ghost { color: #fff; border-color: rgba(255,255,255,.24); }
.button-ghost:hover { border-color: #fff; background: rgba(255,255,255,.08); }
.button-dark { color: #fff; background: var(--ink); }
.button-dark:hover { background: var(--red-dark); }

.hero-note { display: flex; align-items: center; gap: 11px; margin-top: 32px; color: rgba(255,255,255,.48); font-size: 12px; letter-spacing: .08em; }
.pulse-dot { width: 7px; height: 7px; border-radius: 50%; background: #6dc987; box-shadow: 0 0 0 7px rgba(109,201,135,.1); animation: pulse 2s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 11px rgba(109,201,135,0); } }

.hero-visual { position: relative; z-index: 1; }
.hero-visual::before { position: absolute; inset: 7% -8% -7% 12%; z-index: -1; content: ""; border: 1px solid rgba(255,255,255,.13); }
.hero-visual-index { position: absolute; z-index: 3; top: -40px; right: -20px; color: #fff; font-size: 24px; font-weight: 700; letter-spacing: .06em; }
.hero-visual-index span { color: rgba(255,255,255,.35); font-size: 11px; }
.product-stage { position: relative; aspect-ratio: 1 / 1.02; margin: 0; box-shadow: 0 38px 90px rgba(0,0,0,.3); overflow: hidden; }
.product-stage::after { position: absolute; inset: 0; content: ""; border: 1px solid rgba(255,255,255,.1); pointer-events: none; }
.product-stage img { width: 100%; height: 100%; object-fit: cover; filter: contrast(1.05) saturate(.82); }
.product-stage figcaption { position: absolute; inset: auto 0 0; display: flex; justify-content: space-between; align-items: end; padding: 48px 24px 22px; background: linear-gradient(transparent, rgba(15,10,10,.9)); }
.product-stage figcaption span { font-size: 12px; color: rgba(255,255,255,.65); }
.product-stage figcaption strong { font: 700 12px/1.2 "Arial Narrow", Arial, sans-serif; letter-spacing: .12em; }
.tech-label { position: absolute; z-index: 4; display: flex; align-items: center; gap: 8px; color: rgba(255,255,255,.65); font-size: 10px; letter-spacing: .1em; }
.tech-label span { display: block; width: 7px; height: 7px; border: 1px solid #fff; border-radius: 50%; }
.tech-label-a { top: 15%; left: -55px; }
.tech-label-b { right: -40px; bottom: 20%; }

.hero-metrics { position: absolute; z-index: 3; inset: auto 0 0; border-top: 1px solid rgba(255,255,255,.1); background: rgba(14,10,10,.42); backdrop-filter: blur(10px); }
.metric-row { display: grid; grid-template-columns: repeat(4, 1fr); }
.metric { min-height: 112px; display: flex; align-items: center; justify-content: center; gap: 11px; border-right: 1px solid rgba(255,255,255,.1); }
.metric:first-child { border-left: 1px solid rgba(255,255,255,.1); }
.metric strong { font: 700 39px/1 "Arial Narrow", Arial, sans-serif; letter-spacing: -.03em; }
.metric > span { color: var(--red-bright); font-size: 13px; font-weight: 700; line-height: 1.25; }
.metric small { color: rgba(255,255,255,.5); font-size: 11px; font-weight: 400; }
.metric.certification strong { color: var(--red-bright); }

.intro-band { color: #fff; background: var(--red); }
.intro-band-inner { display: grid; grid-template-columns: .23fr 1.14fr .55fr; gap: 56px; align-items: end; min-height: 290px; padding-block: 62px; }
.section-code { align-self: start; color: rgba(255,255,255,.55); font: 700 12px/1 "Arial Narrow", Arial; letter-spacing: .16em; }
.intro-statement { margin: 0; font-size: clamp(30px, 3.5vw, 52px); font-weight: 700; line-height: 1.35; letter-spacing: -.04em; }
.intro-statement span { color: #fff2aa; }
.intro-aside { margin: 0; color: rgba(255,255,255,.7); font-size: 13px; line-height: 2; }

.section-heading { display: grid; grid-template-columns: 1.1fr .58fr; align-items: end; gap: 80px; margin-bottom: 62px; }
.section-heading h2, .about-title h2, .craft-copy h2, .contact-copy h2, .quality-copy h2 { margin-bottom: 0; font-size: clamp(42px, 5vw, 68px); font-weight: 750; letter-spacing: -.055em; }
.section-heading > p { margin: 0 0 7px; color: var(--muted); font-size: 14px; line-height: 2; }

.products { background: var(--paper); }
.product-showcase { display: grid; grid-template-columns: 1.27fr .73fr; gap: 22px; }
.product-feature { display: grid; grid-template-columns: 1.06fr .74fr; min-height: 620px; color: #fff; background: var(--carbon); }
.product-feature-image, .product-card-image { position: relative; overflow: hidden; }
.product-feature-image img { width: 100%; height: 100%; object-fit: cover; }
.image-tag { position: absolute; top: 18px; left: 18px; padding: 8px 11px; color: #fff; background: rgba(24,21,20,.75); font: 700 10px/1 Arial; letter-spacing: .14em; }
.product-feature-copy { display: flex; flex-direction: column; padding: 42px 34px 34px; }
.card-index { margin-bottom: 70px; color: var(--red-bright); font: 700 11px/1 Arial; letter-spacing: .13em; }
.product-feature h3 { margin-bottom: 20px; font-size: 30px; }
.product-feature-copy > p:not(.card-index) { color: rgba(255,255,255,.61); font-size: 13px; line-height: 2; }
.feature-list { margin: auto 0 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.12); }
.feature-list li { display: flex; align-items: center; gap: 16px; padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,.12); font-size: 12px; }
.feature-list li span { color: var(--red-bright); font: 700 10px Arial; }

.product-cards { display: grid; grid-template-rows: 1fr 1fr; gap: 22px; }
.product-card { position: relative; min-height: 299px; overflow: hidden; background: var(--brown); }
.product-card-image, .product-card-image img { width: 100%; height: 100%; }
.product-card-image img { object-fit: cover; opacity: .82; filter: saturate(.8); }
.product-card::after { position: absolute; inset: 0; content: ""; background: linear-gradient(90deg, rgba(18,13,13,.9), rgba(18,13,13,.1)); }
.product-card-copy { position: absolute; z-index: 2; inset: 0; display: flex; flex-direction: column; justify-content: flex-end; width: 75%; padding: 28px; color: #fff; }
.product-card-copy p { margin-bottom: 10px; color: var(--red-bright); font: 700 10px/1 Arial; letter-spacing: .12em; }
.product-card-copy h3 { margin-bottom: 10px; font-size: 22px; }
.product-card-copy span { color: rgba(255,255,255,.66); font-size: 11px; line-height: 1.7; }
.image-zoom img { transition: transform .7s var(--ease); }
.image-zoom:hover img { transform: scale(1.035); }

.application-strip { display: grid; grid-template-columns: 150px 1fr; align-items: center; margin-top: 22px; border: 1px solid var(--line); }
.application-strip > span { padding: 20px 28px; color: var(--red); font-size: 12px; font-weight: 700; letter-spacing: .08em; border-right: 1px solid var(--line); }
.application-strip ul { display: grid; grid-template-columns: repeat(6, 1fr); margin: 0; padding: 0; list-style: none; }
.application-strip li { position: relative; padding: 20px 12px; text-align: center; font-size: 12px; }
.application-strip li + li::before { position: absolute; top: 50%; left: 0; width: 3px; height: 3px; content: ""; border-radius: 50%; background: var(--red); }

.craft { color: #fff; background: var(--ink); }
.craft-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 100px; align-items: center; }
.craft-copy h2 { margin-bottom: 32px; font-size: clamp(40px, 4.3vw, 64px); }
.craft-copy h2 em { display: block; margin-top: 14px; color: var(--red-bright); font-size: .49em; font-weight: 600; letter-spacing: 0; }
.craft-copy > p:not(.eyebrow) { color: rgba(255,255,255,.58); font-size: 14px; line-height: 2.1; }
.text-link { display: inline-flex; align-items: center; gap: 32px; margin-top: 22px; padding-bottom: 7px; border-bottom: 1px solid rgba(255,255,255,.25); font-size: 13px; font-weight: 700; }
.text-link:hover { color: var(--red-bright); border-color: var(--red-bright); }
.craft-steps { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid rgba(255,255,255,.14); border-left: 1px solid rgba(255,255,255,.14); }
.craft-step { position: relative; min-height: 150px; padding: 28px 26px; border-right: 1px solid rgba(255,255,255,.14); border-bottom: 1px solid rgba(255,255,255,.14); transition: background .25s; }
.craft-step:hover { background: var(--red); }
.craft-step > span { position: absolute; top: 22px; right: 22px; color: rgba(255,255,255,.3); font: 700 11px Arial; }
.craft-step strong { display: block; margin: 35px 0 4px; font-size: 18px; }
.craft-step small { color: rgba(255,255,255,.46); font-size: 11px; }
.craft-step:hover small, .craft-step:hover > span { color: rgba(255,255,255,.75); }

.capability { background: var(--paper-deep); }
.factory-gallery { display: grid; grid-template-columns: 1.2fr .8fr; grid-template-rows: 350px 350px; gap: 16px; }
.factory-item { position: relative; margin: 0; overflow: hidden; background: var(--brown); }
.factory-main { grid-row: 1 / 3; }
.factory-item img { width: 100%; height: 100%; object-fit: cover; }
.factory-item::after { position: absolute; inset: 0; content: ""; background: linear-gradient(180deg, transparent 48%, rgba(18,13,13,.88)); }
.factory-item figcaption { position: absolute; z-index: 2; inset: auto 0 0; display: grid; grid-template-columns: auto 1fr; align-items: end; gap: 5px 14px; padding: 28px; color: #fff; }
.factory-item figcaption > span { grid-row: 1 / 3; align-self: center; color: var(--red-bright); font: 700 11px/1 Arial; }
.factory-item figcaption strong { font-size: 18px; line-height: 1.2; }
.factory-item figcaption small { color: rgba(255,255,255,.6); font-size: 11px; }

.quality { min-height: 740px; display: grid; grid-template-columns: 1.1fr .9fr; color: #fff; background: var(--carbon); }
.quality-image { background: linear-gradient(90deg, transparent 78%, var(--carbon)), url("assets/workshop-line.jpg") center/cover no-repeat; }
.quality-copy { display: flex; flex-direction: column; justify-content: center; padding: 90px max(48px, calc((100vw - 1240px)/2)) 90px 70px; }
.quality-copy h2 { margin-bottom: 28px; font-size: clamp(42px, 4.5vw, 66px); }
.quality-copy > p:not(.eyebrow) { max-width: 540px; color: rgba(255,255,255,.58); font-size: 14px; line-height: 2; }
.quality-points { margin-top: 28px; border-top: 1px solid rgba(255,255,255,.13); }
.quality-points > div { display: grid; grid-template-columns: 50px 1fr; gap: 4px 15px; padding: 19px 0; border-bottom: 1px solid rgba(255,255,255,.13); }
.quality-points span { grid-row: 1 / 3; align-self: center; color: var(--red-bright); font: 700 10px Arial; }
.quality-points strong { font-size: 14px; }
.quality-points small { color: rgba(255,255,255,.42); font-size: 11px; }

.about { background: var(--white); }
.about-grid { display: grid; grid-template-columns: .78fr 1.22fr; gap: 110px; }
.about-title { position: relative; }
.about-title h2 { font-size: clamp(44px, 4.7vw, 66px); }
.about-title h2 em { display: inline-block; margin-top: 12px; font-size: .66em; line-height: 1.5; }
.about-english { margin-top: 100px; color: #cac2ba; font: 800 22px/1.25 "Arial Narrow", Arial; letter-spacing: .08em; }
.about-content { padding-top: 42px; }
.about-lead { margin-bottom: 44px; font-size: 23px; font-weight: 650; line-height: 1.75; letter-spacing: -.02em; }
.about-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 35px; }
.about-columns p { color: var(--muted); font-size: 13px; line-height: 2; }
blockquote { position: relative; margin: 45px 0 0; padding: 30px 35px 30px 80px; color: #fff; background: var(--red); }
blockquote > span { position: absolute; top: 2px; left: 28px; color: rgba(255,255,255,.38); font-family: Georgia, serif; font-size: 80px; line-height: 1; }
blockquote p { margin: 0; font-size: 18px; font-weight: 700; letter-spacing: .08em; }

.contact { position: relative; color: #fff; background: var(--red); overflow: hidden; }
.contact::before { position: absolute; inset: 0; content: ""; opacity: .14; background-image: linear-gradient(rgba(255,255,255,.3) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.3) 1px, transparent 1px); background-size: 64px 64px; }
.contact-mark { position: absolute; right: -20px; bottom: -135px; color: rgba(255,255,255,.07); font: 900 360px/1 Arial; letter-spacing: -.12em; }
.contact-grid { position: relative; z-index: 1; display: grid; grid-template-columns: .95fr 1.05fr; gap: 100px; align-items: start; }
.contact-copy h2 { margin-bottom: 26px; }
.contact-copy h2 em { color: #fff2aa; }
.contact-copy > p:not(.eyebrow) { max-width: 540px; color: rgba(255,255,255,.7); font-size: 14px; }
.contact-details { display: grid; gap: 12px; margin-top: 45px; }
.contact-details > * { display: grid; grid-template-columns: 60px 1fr; gap: 16px; align-items: baseline; }
.contact-details span { color: rgba(255,255,255,.5); font-size: 11px; }
.contact-details strong { font-size: 14px; font-weight: 600; }
.contact-details a:hover strong { text-decoration: underline; }

.inquiry-form { padding: 42px; color: var(--ink); background: var(--paper); box-shadow: var(--shadow); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.inquiry-form label { display: block; margin-bottom: 20px; font-size: 11px; font-weight: 700; letter-spacing: .04em; }
.inquiry-form input, .inquiry-form textarea { width: 100%; margin-top: 8px; padding: 12px 0; color: var(--ink); background: transparent; border: 0; border-bottom: 1px solid rgba(24,21,20,.2); border-radius: 0; outline: 0; font-size: 14px; font-weight: 400; resize: vertical; transition: border-color .2s; }
.inquiry-form input:focus, .inquiry-form textarea:focus { border-color: var(--red); }
.inquiry-form input::placeholder, .inquiry-form textarea::placeholder { color: #a8a09a; }
.inquiry-form .button { width: 100%; margin-top: 5px; border: 0; }
.form-note { margin: 13px 0 0; color: var(--muted); font-size: 10px; text-align: center; }

.site-footer { padding: 72px 0 24px; color: #fff; background: #100d0d; }
.footer-main { display: grid; grid-template-columns: 1.4fr .6fr 1fr; gap: 70px; padding-bottom: 58px; }
.footer-brand img {
  width: 190px;
  height: auto;
  opacity: .9;
  filter: grayscale(1) brightness(0) invert(1);
}
.footer-brand p { margin: 24px 0 0; color: rgba(255,255,255,.5); font-size: 13px; }
.footer-nav, .footer-contact { display: flex; flex-direction: column; align-items: flex-start; gap: 7px; }
.footer-nav p, .footer-contact p { margin-bottom: 14px; color: rgba(255,255,255,.35); font-size: 10px; font-weight: 700; letter-spacing: .12em; }
.footer-nav a, .footer-contact a, .footer-contact span { color: rgba(255,255,255,.68); font-size: 12px; }
.footer-nav a:hover, .footer-contact a:hover { color: var(--red-bright); }
.footer-bottom { display: flex; justify-content: space-between; padding-top: 20px; color: rgba(255,255,255,.28); border-top: 1px solid rgba(255,255,255,.1); font: 10px/1.5 Arial, sans-serif; letter-spacing: .04em; }
.footer-bottom p { margin: 0; }

.back-to-top { position: fixed; z-index: 80; right: 22px; bottom: 22px; width: 46px; height: 46px; color: #fff; background: var(--ink); border: 0; opacity: 0; pointer-events: none; transform: translateY(10px); transition: opacity .25s, transform .25s, background .25s; }
.back-to-top.is-visible { opacity: 1; pointer-events: auto; transform: none; }
.back-to-top:hover { background: var(--red); }

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

@media (max-width: 1120px) {
  :root { --shell: min(100% - 48px, 1080px); }
  .brand-name { display: none; }
  .site-nav { gap: 22px; }
  .hero-inner { grid-template-columns: .9fr .7fr; gap: 40px; }
  .hero-copy h1 { font-size: 66px; }
  .product-feature { grid-template-columns: 1fr; }
  .product-feature-image { min-height: 390px; }
  .product-feature-copy { min-height: 350px; }
  .card-index { margin-bottom: 25px; }
  .craft-grid, .about-grid { gap: 65px; }
  .quality-copy { padding-left: 45px; }
  .contact-grid { gap: 60px; }
}

@media (max-width: 900px) {
  :root { --header-height: 72px; --shell: calc(100% - 40px); }
  .section { padding: 92px 0; }
  .site-header { height: var(--header-height); }
  .site-header.is-scrolled { height: 64px; }
  .brand > img { width: 139px; height: 45px; }
  .nav-toggle { display: block; z-index: 3; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-toggle[aria-expanded="true"] span { background: #fff; }
  .site-nav { position: fixed; inset: 0; height: 100dvh; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 0; padding: 90px 11vw; color: #fff; background: var(--ink); visibility: hidden; opacity: 0; transform: translateY(-12px); transition: opacity .3s, transform .3s, visibility .3s; }
  .site-nav.is-open { visibility: visible; opacity: 1; transform: none; }
  .site-nav a { width: 100%; padding: 15px 0; font-size: 28px; border-bottom: 1px solid rgba(255,255,255,.12); }
  .site-nav a::after { display: none; }
  .nav-contact { margin-top: 30px; justify-content: space-between; padding-inline: 18px !important; color: #fff; background: var(--red); border-bottom: 0 !important; font-size: 16px !important; }

  .hero { min-height: auto; padding-bottom: 0; }
  .hero-inner { grid-template-columns: 1fr; gap: 70px; min-height: auto; padding-block: 80px 165px; }
  .hero-copy { max-width: 760px; }
  .hero-copy h1 { font-size: clamp(54px, 10vw, 80px); }
  .hero-visual { width: min(620px, 90%); margin-left: auto; }
  .hero::after { width: 70%; }
  .hero-metrics { position: relative; }
  .metric-row { width: 100%; grid-template-columns: repeat(2, 1fr); }
  .metric { border-bottom: 1px solid rgba(255,255,255,.1); }
  .metric:first-child { border-left: 0; }
  .intro-band-inner { grid-template-columns: 1fr; gap: 20px; }
  .intro-aside { max-width: 570px; }

  .section-heading { grid-template-columns: 1fr; gap: 28px; }
  .section-heading > p { max-width: 660px; }
  .product-showcase { grid-template-columns: 1fr; }
  .product-feature { grid-template-columns: 1.05fr .85fr; }
  .product-feature-copy { min-height: 0; }
  .product-cards { grid-template-columns: 1fr 1fr; grid-template-rows: auto; }
  .application-strip { grid-template-columns: 110px 1fr; }
  .application-strip ul { grid-template-columns: repeat(3, 1fr); }

  .craft-grid, .about-grid { grid-template-columns: 1fr; gap: 60px; }
  .craft-copy { max-width: 680px; }
  .factory-gallery { grid-template-rows: 300px 300px; }
  .quality { grid-template-columns: 1fr; }
  .quality-image { min-height: 460px; background-image: linear-gradient(0deg, var(--carbon), transparent 50%), url("assets/workshop-line.jpg"); }
  .quality-copy { padding: 50px var(--shell) 90px; }
  .about-title h2 { max-width: 630px; }
  .about-english { margin-top: 45px; }
  .about-content { padding-top: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-copy { max-width: 700px; }
  .footer-main { grid-template-columns: 1.1fr .7fr 1fr; gap: 30px; }
}

@media (max-width: 640px) {
  :root { --shell: calc(100% - 28px); }
  .section { padding: 76px 0; }
  .site-header { border-bottom-color: rgba(24,21,20,.06); }
  .brand > img { width: 126px; }
  .hero-inner { gap: 55px; padding-block: 65px 145px; }
  .hero-copy h1 { margin-bottom: 23px; font-size: 48px; }
  .hero-lead { font-size: 14px; line-height: 1.9; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .button { width: 100%; }
  .hero-visual { width: 92%; }
  .hero-visual-index { top: -31px; right: 0; }
  .tech-label { display: none; }
  .metric { min-height: 94px; }
  .metric strong { font-size: 31px; }
  .intro-band-inner { min-height: 0; padding-block: 54px; }
  .intro-statement { font-size: 31px; }

  .section-heading h2, .about-title h2, .contact-copy h2, .quality-copy h2 { font-size: 40px; }
  .product-feature { grid-template-columns: 1fr; }
  .product-feature-image { min-height: 390px; }
  .product-feature-copy { padding: 30px 24px; }
  .product-cards { grid-template-columns: 1fr; }
  .product-card { min-height: 290px; }
  .application-strip { grid-template-columns: 1fr; }
  .application-strip > span { border-right: 0; border-bottom: 1px solid var(--line); }
  .application-strip ul { grid-template-columns: repeat(2, 1fr); }
  .application-strip li:nth-child(odd)::before { display: none; }

  .craft-copy h2 { font-size: 39px; }
  .craft-steps { grid-template-columns: 1fr; }
  .craft-step { min-height: 126px; }
  .factory-gallery { grid-template-columns: 1fr; grid-template-rows: repeat(4, 260px); }
  .factory-main { grid-row: auto; }
  .quality-image { min-height: 340px; }
  .quality-copy { padding-inline: 22px; }
  .about-columns { grid-template-columns: 1fr; gap: 6px; }
  .about-lead { font-size: 19px; }
  blockquote { padding: 28px 22px 28px 64px; }
  blockquote p { font-size: 15px; }
  .contact-mark { font-size: 190px; bottom: -65px; }
  .inquiry-form { padding: 28px 20px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }

  .footer-main { grid-template-columns: 1fr; gap: 38px; }
  .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; }
}