:root {
  --ink: #102a39;
  --ink-2: #173b4d;
  --green: #0a9a5b;
  --green-dark: #087346;
  --mint: #dff4e8;
  --paper: #f5f7f4;
  --paper-2: #edf1ed;
  --white: #ffffff;
  --muted: #66767e;
  --line: #d9e0dc;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  --shadow: 0 22px 60px rgba(16, 42, 57, 0.12);
  --container: min(1220px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
.container { width: var(--container); margin-inline: auto; }
.sr-only, .skip-link {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link:focus { width: auto; height: auto; padding: 12px 18px; margin: 0; clip: auto; z-index: 999; background: var(--green); color: #fff; }

.topbar { background: #0c222f; color: #c9d6dc; font-size: 12px; letter-spacing: .05em; }
.topbar-inner { min-height: 36px; display: flex; align-items: center; justify-content: space-between; }
.topbar p { margin: 0; }
.topbar-links { display: flex; align-items: center; gap: 16px; }
.topbar-links > span { width: 1px; height: 13px; background: #49606c; }
.language { background: transparent; border: 0; color: #fff; cursor: pointer; padding: 2px 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 25, 35, .94);
  color: #fff;
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
  transition: box-shadow .25s ease, background .25s ease;
}
.site-header.is-scrolled { box-shadow: 0 12px 30px rgba(0, 0, 0, .2); background: rgba(7, 25, 35, .98); }
.nav-shell { height: 88px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; min-width: 226px; }
.brand img { width: 46px; height: 46px; object-fit: contain; border-radius: 50%; }
.brand-copy { display: grid; line-height: 1.2; }
.brand-copy strong { font-size: 19px; letter-spacing: .08em; }
.brand-copy small { color: #78d9a6; font-size: 9px; letter-spacing: .18em; margin-top: 5px; }
.primary-nav { margin-left: auto; display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 600; }
.primary-nav a { position: relative; padding-block: 28px; }
.primary-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 20px; height: 2px; background: var(--green); transition: right .25s ease; }
.primary-nav a:hover::after, .primary-nav a:focus-visible::after { right: 0; }
.nav-cta { display: inline-flex; align-items: center; gap: 16px; background: var(--green); color: #fff; padding: 13px 18px; font-size: 13px; font-weight: 700; }
.nav-cta span { color: #d9ffea; }
.menu-toggle { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--line); background: #fff; place-content: center; gap: 5px; cursor: pointer; }
.menu-toggle > span:not(.sr-only) { display: block; width: 20px; height: 2px; background: var(--ink); transition: .2s ease; }

.hero { position: relative; min-height: calc(100vh - 88px); overflow: hidden; isolation: isolate; background: radial-gradient(circle at 76% 42%, #164b3a 0%, #0c2c2b 22%, #081e28 50%, #061722 78%); color: #fff; }
.hero-grid { position: absolute; inset: 0; opacity: .7; background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px); background-size: 74px 74px; mask-image: linear-gradient(to right, #000, transparent 88%); }
.hero::before { content: ""; position: absolute; width: 760px; height: 760px; right: -180px; top: -230px; border-radius: 50%; border: 1px solid rgba(116, 232, 171, .16); box-shadow: 0 0 120px rgba(10,154,91,.13) inset; }
.hero::after { content: "AIRFLOW"; position: absolute; right: -38px; bottom: -85px; z-index: -1; color: rgba(255,255,255,.025); font-size: 218px; font-weight: 900; letter-spacing: -.06em; line-height: 1; }
.hero-track { position: relative; z-index: 1; display: grid; }
.hero-slide { grid-area: 1 / 1; opacity: 0; visibility: hidden; pointer-events: none; transform: translateX(4%); transition: opacity .58s ease, transform .72s cubic-bezier(.2,.7,.2,1), visibility 0s linear .72s; }
.hero-slide.is-active { opacity: 1; visibility: visible; pointer-events: auto; transform: none; transition-delay: 0s; }
.hero-layout { position: relative; min-height: 700px; display: grid; grid-template-columns: .98fr 1.02fr; align-items: center; gap: 58px; padding-block: 58px 104px; }
.hero-copy { position: relative; z-index: 4; max-width: 660px; }
.eyebrow, .section-kicker { color: var(--green-dark); font-size: 11px; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; color: #75dda9; }
.eyebrow span { width: 28px; height: 2px; background: var(--green); }
.hero-positioning { margin: 0 0 22px; color: #d8e5e8; font-size: 14px; font-weight: 700; letter-spacing: .16em; }
.hero h1 { margin: 0; max-width: 680px; font-size: clamp(42px, 4vw, 58px); line-height: 1.13; letter-spacing: -.048em; font-weight: 760; }
.hero h1 > span { white-space: nowrap; }
.hero h1 em { display: inline-block; margin-top: 7px; color: #82e3b0; font-family: inherit; font-weight: 720; font-style: normal; }
.hero-lead { max-width: 625px; margin: 27px 0 0; color: #aebfc6; font-size: 16px; line-height: 1.85; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.button { min-height: 51px; display: inline-flex; align-items: center; justify-content: center; gap: 22px; padding: 13px 22px; border: 1px solid transparent; font-size: 14px; font-weight: 750; letter-spacing: .02em; transition: transform .2s ease, background .2s ease, color .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--green); color: #fff; }
.button-primary:hover { background: var(--green-dark); }
.hero .button-ghost { border-color: #49646f; background: rgba(255,255,255,.035); color: #fff; }
.hero .button-ghost:hover { background: #fff; color: var(--ink); }
.hero-proof-note { max-width: 610px; margin: 23px 0 0; padding-left: 14px; border-left: 2px solid rgba(117, 221, 169, .6); color: #91a8a1; font-size: 11px; line-height: 1.65; }
.hero-proof-note span { margin-right: 7px; color: #75dda9; font-weight: 800; letter-spacing: .12em; }
.hero-visual { position: relative; min-height: 520px; isolation: isolate; }
.hero-product-cloud { width: min(560px, 100%); margin-inline: auto; }
.hero-halo { position: absolute; inset: 8% 5% 5% 9%; border-radius: 50%; background: radial-gradient(circle, rgba(116,232,171,.18), rgba(10,154,91,.05) 52%, transparent 72%); border: 1px solid rgba(130,227,176,.15); }
.hero-halo::before, .hero-halo::after { content: ""; position: absolute; border-radius: 50%; border: 1px solid rgba(130,227,176,.13); }
.hero-halo::before { inset: 9%; }
.hero-halo::after { inset: 22%; border-style: dashed; }
.hero-product { position: absolute; z-index: 2; height: auto; object-fit: contain; filter: saturate(.96) contrast(1.03) drop-shadow(0 24px 24px rgba(0,0,0,.24)); }
.hero-product-main { width: 292px; left: 112px; top: 112px; z-index: 4; }
.hero-product-metal { width: 206px; right: 8px; top: 22px; z-index: 2; transform: rotate(4deg); }
.hero-product-dc { width: 174px; right: 42px; bottom: 31px; z-index: 3; transform: rotate(-4deg); }
.hero-product-blower { width: 142px; left: 7px; bottom: 40px; z-index: 3; transform: rotate(5deg); }
.hero-series-list { position: absolute; left: 50%; bottom: 2px; z-index: 6; width: max-content; margin: 0; display: flex; gap: 20px; transform: translateX(-50%); color: #93a8b1; font-size: 10px; letter-spacing: .12em; }
.hero-series-list span { display: inline-flex; align-items: center; gap: 7px; }
.hero-series-list span::before { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--green); }
.certificate-stage { width: min(560px, 100%); margin-inline: auto; }
.certificate-stage::before { content: ""; position: absolute; inset: 7% 4% 3%; border-radius: 50%; background: radial-gradient(circle, rgba(116,232,171,.17), rgba(10,154,91,.04) 55%, transparent 72%); }
.certificate-sheet { position: absolute; z-index: 2; width: 184px; margin: 0; padding: 7px 7px 28px; overflow: hidden; border: 1px solid rgba(255,255,255,.28); border-radius: 5px; background: #fff; box-shadow: 0 24px 46px rgba(0,0,0,.22); }
.certificate-sheet img { width: 100%; height: auto; }
.certificate-sheet figcaption { position: absolute; left: 9px; right: 9px; bottom: 7px; color: #2f5448; font-size: 9px; font-weight: 750; letter-spacing: .06em; text-align: center; }
.certificate-main { width: 224px; left: calc(50% - 112px); top: 24px; z-index: 4; }
.certificate-left { left: 18px; top: 102px; transform: rotate(-7deg); }
.certificate-right { right: 12px; top: 112px; transform: rotate(7deg); }
.certification-marks { position: absolute; left: 50%; bottom: 5px; z-index: 6; display: flex; gap: 8px; transform: translateX(-50%); }
.certification-marks span { min-width: 42px; padding: 7px 9px; border: 1px solid rgba(130,227,176,.25); color: #9fd9bc; font-size: 9px; font-weight: 850; letter-spacing: .08em; text-align: center; }
.partnership-stage { width: min(520px, 100%); min-height: 470px; margin-inline: auto; overflow: hidden; border: 1px solid rgba(255,255,255,.15); border-radius: 28px; box-shadow: 0 32px 70px rgba(0,0,0,.25); }
.partnership-stage > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.partnership-shade { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(5,30,31,.02) 20%, rgba(5,30,31,.88) 100%); }
.partnership-caption { position: absolute; left: 36px; right: 36px; bottom: 34px; z-index: 2; display: grid; gap: 8px; color: #fff; }
.partnership-caption span { color: #86deb1; font-size: 9px; font-weight: 850; letter-spacing: .16em; }
.partnership-caption strong { font-size: 19px; line-height: 1.35; }
.partnership-caption small { color: #b6c9c1; font-size: 10px; }
.hero-controls { position: absolute; left: 50%; bottom: 24px; z-index: 8; width: var(--container); display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px; transform: translateX(-50%); }
.hero-arrows { display: flex; gap: 8px; }
.hero-arrow { width: 43px; height: 43px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; background: rgba(5,30,31,.08); color: currentColor; cursor: pointer; transition: border-color .2s ease, background .2s ease, transform .2s ease; }
.hero-arrow:hover { border-color: var(--green); background: rgba(10,154,91,.1); transform: translateY(-2px); }
.hero-pagination { justify-self: center; display: flex; align-items: center; gap: 9px; }
.hero-dot { width: 28px; height: 18px; padding: 0; border: 0; background: transparent; cursor: pointer; }
.hero-dot span { display: block; width: 100%; height: 2px; background: rgba(255,255,255,.25); transition: height .2s ease, background .2s ease; }
.hero-dot.is-active span { height: 3px; background: var(--green); }
.hero-counter { margin: 0; display: flex; align-items: baseline; gap: 8px; font-size: 15px; font-weight: 780; letter-spacing: .08em; }
.hero-counter i { color: #718993; font-size: 9px; font-style: normal; }
.hero-arrow:focus-visible, .hero-dot:focus-visible { outline: 3px solid rgba(10,154,91,.28); outline-offset: 3px; }

.section { padding-block: 110px; }
.section-heading { display: grid; grid-template-columns: 1.5fr .7fr; gap: 70px; align-items: end; margin-bottom: 54px; }
.section-kicker { margin: 0 0 13px; }
.section-heading h2, .quality h2, .downloads h2, .about h2, .contact h2 { margin: 0; font-size: clamp(35px, 4vw, 54px); line-height: 1.18; letter-spacing: -.045em; }
.section-heading > p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }
.series { background: #fff; }
.series-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.series-card { position: relative; min-height: 365px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; transition: background .25s ease, color .25s ease, transform .25s ease; }
.series-card::after { content: ""; position: absolute; width: 160px; height: 160px; right: -80px; bottom: -80px; border-radius: 50%; border: 1px solid rgba(10,154,91,.22); transition: transform .3s ease; }
.series-card:hover { background: var(--ink); color: #fff; transform: translateY(-5px); }
.series-card:hover::after { transform: scale(1.3); }
.series-card:hover p { color: #afc0c7; }
.series-card:hover .series-icon { border-color: #315163; }
.series-number { color: #98a8a1; font-size: 10px; letter-spacing: .15em; }
.series-icon { width: 76px; height: 76px; margin: 34px 0 28px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; color: var(--green); }
.series-icon svg { width: 43px; height: 43px; fill: none; stroke: currentColor; stroke-width: 1.2; }
.series-card h3 { margin: 0 0 13px; font-size: 21px; }
.series-card p { min-height: 72px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; transition: color .25s ease; }
.series-card a { display: inline-flex; gap: 28px; margin-top: 26px; color: var(--green); font-size: 12px; font-weight: 800; }

.featured { background: var(--ink); color: #fff; }
.section-heading-light > p { color: #aab9c0; }
.section-heading-light .section-kicker { color: #63dba0; }
.filter-row { display: flex; gap: 8px; margin-bottom: 28px; }
.filter { padding: 9px 15px; border: 1px solid #365463; background: transparent; color: #b9c7cc; cursor: pointer; font-size: 12px; }
.filter.is-active, .filter:hover { background: var(--green); border-color: var(--green); color: #fff; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.product-card { transition: opacity .2s ease, transform .2s ease; }
.product-card[hidden] { display: none; }
.product-media { position: relative; aspect-ratio: 1 / 1.05; background: #edf1ee; overflow: hidden; }
.product-media::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 1px rgba(255,255,255,.14); pointer-events: none; }
.product-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.product-card:hover .product-media img { transform: scale(1.045); }
.product-tag { position: absolute; z-index: 2; top: 14px; left: 14px; padding: 7px 9px; background: rgba(16,42,57,.88); color: #fff; font-size: 8px; font-weight: 800; letter-spacing: .16em; }
.product-media > a { position: absolute; z-index: 2; right: 14px; bottom: 14px; width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--green); color: #fff; transition: transform .2s ease; }
.product-media > a:hover { transform: rotate(12deg); }
.product-body { padding: 22px 2px 0; }
.product-body > div:first-child { display: flex; justify-content: space-between; align-items: end; gap: 10px; }
.product-body p { margin: 0; color: #8fa5af; font-size: 10px; }
.product-body h3 { margin: 3px 0 0; font-size: 21px; letter-spacing: -.02em; }
.product-body dl { margin: 18px 0 0; border-top: 1px solid #345361; }
.product-body dl div { display: flex; justify-content: space-between; gap: 10px; padding-block: 9px; border-bottom: 1px solid #2a4856; font-size: 10px; }
.product-body dt { color: #7f969f; }
.product-body dd { margin: 0; color: #d4dfe3; text-align: right; }
.featured-foot { margin-top: 54px; padding-top: 22px; border-top: 1px solid #345361; display: flex; justify-content: space-between; gap: 20px; color: #93a7af; font-size: 13px; }
.featured-foot p { margin: 0; }
.featured-foot a { color: #67dfa3; font-weight: 700; }

.applications { background: var(--paper); }
.application-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.application-card { position: relative; min-height: 230px; padding: 30px; background: var(--paper); overflow: hidden; }
.application-card::before { content: ""; position: absolute; inset: auto 0 0; height: 4px; background: var(--green); transform: scaleX(0); transform-origin: left; transition: transform .3s ease; }
.application-card:hover::before { transform: scaleX(1); }
.application-card > span { color: var(--green); font: italic 22px var(--serif); }
.application-card h3 { margin: 28px 0 8px; font-size: 21px; }
.application-card p { max-width: 300px; margin: 0; color: var(--muted); font-size: 13px; }
.application-card i { position: absolute; right: 24px; bottom: 20px; color: #b5c0bb; font-size: 8px; font-style: normal; letter-spacing: .16em; }

.quality { background: #fff; }
.quality-layout { display: grid; grid-template-columns: .92fr 1.08fr; gap: 76px; align-items: center; }
.quality-photo { position: relative; min-height: 680px; overflow: hidden; background: var(--paper-2); }
.quality-photo img { width: 100%; height: 680px; object-fit: cover; object-position: 50% 82%; transform: scale(1.02); }
.photo-caption { position: absolute; left: 0; bottom: 0; width: 72%; padding: 20px 24px; background: var(--ink); color: #fff; }
.photo-caption span { color: #6ee0a7; font-size: 8px; letter-spacing: .2em; }
.photo-caption p { margin: 5px 0 0; font-size: 13px; }
.quality-copy > .section-kicker { margin-bottom: 14px; }
.quality-lead { margin: 24px 0 34px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.quality-steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.quality-steps li { display: grid; grid-template-columns: 50px 1fr; gap: 16px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.quality-steps li > span { color: var(--green); font: italic 19px var(--serif); }
.quality-steps h3 { margin: 0 0 4px; font-size: 14px; }
.quality-steps p { margin: 0; color: var(--muted); font-size: 12px; }
.cert-row { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 28px; }
.cert-row span { min-width: 54px; padding: 8px 11px; border: 1px solid var(--line); color: #38525d; font-size: 11px; font-weight: 800; text-align: center; }

.about { background: #e9efeb; }
.about-layout { display: grid; grid-template-columns: .45fr 1.2fr .85fr; gap: 60px; align-items: start; }
.about-index { margin: 3px 0 0; color: #9aaba3; font-size: 10px; letter-spacing: .18em; line-height: 1.8; }
.about-layout > p:last-child { margin: 41px 0 0; color: var(--muted); font-size: 14px; line-height: 1.9; }

.contact { position: relative; padding-block: 110px; overflow: hidden; background: #0c222f; color: #fff; }
.contact-lines { position: absolute; inset: 0; opacity: .2; background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px); background-size: 74px 74px; }
.contact::after { content: ""; position: absolute; width: 480px; height: 480px; right: -120px; bottom: -300px; border: 1px solid rgba(100,227,164,.32); border-radius: 50%; }
.contact-layout { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr .85fr; gap: 100px; }
.contact .section-kicker { color: #6ee0a7; }
.contact h2 { font-size: clamp(45px, 5vw, 68px); }
.contact-copy > p { max-width: 530px; margin: 42px 0 0; color: #b1c1c8; line-height: 1.9; }
.contact-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 30px 0 42px; }
.button-outline-light { color: #fff; border-color: #55707c; }
.button-outline-light:hover { background: #fff; color: var(--ink); }
.contact-list { margin: 0; border-top: 1px solid #334f5c; }
.contact-list div { display: flex; justify-content: space-between; gap: 25px; padding: 12px 0; border-bottom: 1px solid #334f5c; font-size: 12px; }
.contact-list dt { color: #7f98a3; }
.contact-list dd { margin: 0; }

.site-footer { background: #071923; color: #9eb0b8; }
.footer-main { min-height: 185px; display: grid; grid-template-columns: 1fr .7fr .8fr; align-items: center; gap: 50px; }
.brand-light { color: #fff; }
.brand-light .brand-copy small { color: #8ca1aa; }
.footer-main > p { font-size: 12px; line-height: 1.9; }
.footer-main nav { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 20px; font-size: 11px; }
.footer-main nav a:hover { color: #fff; }
.footer-bottom { min-height: 52px; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid #1e3641; font-size: 9px; letter-spacing: .08em; }
.footer-bottom p { margin: 0; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
.delay-1 { transition-delay: .08s; }
.delay-2 { transition-delay: .16s; }
.delay-3 { transition-delay: .24s; }
@keyframes rotate { to { transform: rotate(360deg); } }

@media (min-width: 781px) and (max-height: 800px) {
  .hero-layout { min-height: calc(100vh - 88px); padding-block: 38px 78px; }
  .hero-visual { min-height: 460px; }
  .hero-product-main { top: 84px; }
  .hero-product-metal { top: 10px; }
  .hero-product-dc { bottom: 26px; }
  .hero-product-blower { bottom: 34px; }
  .partnership-stage { min-height: 430px; }
  .hero-controls { bottom: 18px; }
}

@media (max-width: 1060px) {
  .primary-nav { gap: 18px; }
  .primary-nav a { font-size: 12px; }
  .nav-cta { display: none; }
  .hero-layout { grid-template-columns: .96fr 1.04fr; gap: 30px; }
  .hero h1 { font-size: clamp(40px, 4.2vw, 48px); }
  .hero-visual { min-height: 500px; }
  .hero-product-cloud, .certificate-stage { max-width: 500px; }
  .hero-product-main { width: 260px; left: 90px; top: 118px; }
  .hero-product-metal { width: 180px; }
  .hero-product-dc { width: 155px; right: 33px; }
  .hero-product-blower { width: 126px; }
  .certificate-main { width: 205px; left: calc(50% - 102px); }
  .certificate-left, .certificate-right { width: 164px; }
  .partnership-stage { min-height: 440px; }
  .series-grid, .product-grid { grid-template-columns: repeat(2, 1fr); }
  .series-card { min-height: 330px; }
  .quality-layout { gap: 45px; }
  .download-shell { grid-template-columns: 100px 1fr; }
  .download-shell .button { grid-column: 2; justify-self: start; }
  .about-layout { grid-template-columns: .3fr 1fr; }
  .about-layout > p:last-child { grid-column: 2; margin-top: 0; }
}

@media (max-width: 780px) {
  :root { --container: min(100% - 32px, 680px); }
  .nav-shell { height: 72px; }
  .brand { min-width: auto; }
  .brand img { width: 40px; height: 40px; }
  .brand-copy strong { font-size: 16px; }
  .brand-copy small { font-size: 7px; }
  .menu-toggle { display: grid; border-color: #35505c; background: rgba(255,255,255,.04); }
  .menu-toggle > span:not(.sr-only) { background: #fff; }
  .menu-toggle[aria-expanded="true"] > span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] > span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] > span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .primary-nav { position: fixed; inset: 72px 0 auto; min-height: calc(100vh - 72px); padding: 34px 24px; background: #071923; color: #fff; display: none; flex-direction: column; align-items: flex-start; gap: 0; }
  .primary-nav.is-open { display: flex; }
  .primary-nav a { width: 100%; padding: 17px 0; border-bottom: 1px solid #29444f; font-size: 17px; }
  .primary-nav a::after { display: none; }
  .hero { min-height: auto; }
  .hero-layout { min-height: 0; grid-template-columns: 1fr; align-items: start; gap: 28px; padding-block: 58px 104px; }
  .hero-copy { max-width: none; }
  .hero h1 { font-size: clamp(40px, 8vw, 56px); }
  .hero h1 > span { white-space: normal; }
  .hero-lead { font-size: 15px; }
  .hero-visual { min-height: 390px; margin-top: 0; }
  .hero-product-cloud, .certificate-stage, .partnership-stage { width: min(100%, 500px); }
  .hero-product-main { width: 240px; left: calc(50% - 120px); top: 84px; }
  .hero-product-metal { width: 160px; right: 12px; top: 10px; }
  .hero-product-dc { width: 140px; right: 30px; bottom: 37px; }
  .hero-product-blower { width: 112px; left: 13px; bottom: 44px; }
  .hero-series-list { bottom: 2px; }
  .certificate-main { width: 178px; left: calc(50% - 89px); top: 8px; }
  .certificate-left, .certificate-right { width: 145px; top: 69px; }
  .certificate-left { left: 5%; }
  .certificate-right { right: 5%; }
  .partnership-stage { min-height: 360px; }
  .hero-controls { bottom: 20px; }
  .section { padding-block: 78px; }
  .section-heading { grid-template-columns: 1fr; gap: 20px; margin-bottom: 38px; }
  .section-heading h2, .quality h2, .about h2 { font-size: clamp(34px, 9vw, 46px); }
  .series-grid, .product-grid, .application-grid { grid-template-columns: 1fr 1fr; }
  .series-card { min-height: 320px; }
  .quality-layout { grid-template-columns: 1fr; }
  .quality-photo { min-height: 520px; }
  .quality-photo img { height: 520px; }
  .download-shell { min-height: 0; padding: 45px 30px; grid-template-columns: 1fr; gap: 24px; }
  .download-mark { display: none; }
  .download-shell .button { grid-column: auto; }
  .about-layout { grid-template-columns: 1fr; gap: 22px; }
  .about-index { display: none; }
  .about-layout > p:last-child { grid-column: auto; margin: 0; }
  .contact-layout { grid-template-columns: 1fr; gap: 24px; }
  .contact-copy > p { margin-top: 0; }
  .footer-main { grid-template-columns: 1fr; gap: 24px; padding-block: 45px; }
  .footer-main nav { justify-content: flex-start; }
}

@media (max-width: 520px) {
  :root { --container: calc(100% - 28px); }
  .brand-copy small { display: none; }
  .hero-layout { gap: 22px; padding-top: 46px; }
  .hero h1 { font-size: clamp(32px, 9vw, 42px); }
  .hero-positioning { margin-bottom: 16px; font-size: 12px; letter-spacing: .12em; }
  .hero-lead { margin-top: 21px; line-height: 1.72; }
  .hero-actions .button { width: 100%; }
  .hero-proof-note { margin-top: 18px; }
  .hero-visual { min-height: 330px; }
  .hero-product-cloud, .certificate-stage, .partnership-stage { max-width: 360px; }
  .hero-product-main { width: 188px; left: calc(50% - 94px); top: 78px; }
  .hero-product-metal { width: 122px; right: 2px; top: 18px; }
  .hero-product-dc { width: 111px; right: 17px; bottom: 39px; }
  .hero-product-blower { width: 91px; left: 4px; bottom: 45px; }
  .hero-series-list { gap: 11px; font-size: 8px; letter-spacing: .06em; }
  .certificate-main { width: 150px; left: calc(50% - 75px); top: 2px; }
  .certificate-left, .certificate-right { width: 116px; top: 55px; }
  .certificate-left { left: 0; }
  .certificate-right { right: 0; }
  .certification-marks { gap: 5px; }
  .certification-marks span { min-width: 34px; padding: 6px; }
  .partnership-stage { min-height: 315px; border-radius: 20px; }
  .partnership-caption { left: 22px; right: 22px; bottom: 22px; }
  .partnership-caption strong { font-size: 16px; }
  .hero-controls { gap: 14px; }
  .hero-arrow { width: 39px; height: 39px; }
  .hero-dot { width: 22px; }
  .series-grid, .product-grid, .application-grid { grid-template-columns: 1fr; }
  .series-card { min-height: 300px; }
  .product-grid { gap: 34px; }
  .filter-row { overflow-x: auto; padding-bottom: 4px; }
  .filter { white-space: nowrap; }
  .featured-foot { flex-direction: column; }
  .quality-photo { min-height: 430px; }
  .quality-photo img { height: 430px; }
  .download-shell { margin-inline: 0; width: 100%; }
  .contact { padding-block: 78px; }
  .contact h2 { font-size: 42px; }
  .contact-actions .button { width: 100%; }
  .contact-list div { display: grid; gap: 3px; }
  .footer-bottom { padding-block: 18px; display: grid; gap: 6px; }
}

@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; }
}