:root {
  --red: #d80d18;
  --red-dark: #a90811;
  --ink: #111417;
  --graphite: #191e23;
  --muted: #626a73;
  --line: #dde1e5;
  --soft: #f4f5f6;
  --white: #fff;
  --shell: min(1200px, calc(100% - 48px));
  --shadow: 0 20px 60px rgba(12, 19, 24, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body.dialog-open { overflow: hidden; }
img { display: block; max-width: 100%; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
.shell { width: var(--shell); margin-inline: auto; }
.sr-only {
  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 { position: fixed; left: 16px; top: -60px; z-index: 100; background: var(--red); color: #fff; padding: 10px 16px; }
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky; top: 0; z-index: 50; height: 96px; background: rgba(255,255,255,.98);
  border-bottom: 1px solid rgba(17,20,23,.08); box-shadow: 0 8px 30px rgba(12,19,24,.06); backdrop-filter: blur(16px);
}
.header-inner { position: relative; z-index: 2; height: 100%; display: flex; align-items: center; gap: clamp(24px, 2.4vw, 40px); }
.brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
.brand img { width: 232px; height: auto; object-fit: contain; }
.site-nav { display: flex; justify-content: center; align-items: stretch; gap: clamp(17px, 1.7vw, 29px); align-self: stretch; flex: 1; }
.site-nav a { position: relative; display: inline-flex; align-items: center; gap: 6px; padding-top: 2px; font-size: 15px; font-weight: 720; white-space: nowrap; }
.site-nav a::after { content: ""; position: absolute; left: 50%; bottom: 20px; width: 0; height: 3px; background: var(--red); transition: .25s ease; transform: translateX(-50%); }
.site-nav a:hover::after, .site-nav a.active::after { width: 30px; }
.site-nav a.active { color: var(--red); }
.nav-caret { width: 11px; height: 7px; fill: none; stroke: currentColor; stroke-width: 1.7; transition: transform .2s ease; }
.site-header.mega-open .site-nav a[aria-expanded="true"] .nav-caret { transform: rotate(180deg); }
.header-phone { display: inline-flex; align-items: center; gap: 10px; min-height: 46px; padding: 0 18px; border: 1px solid var(--red); border-radius: 24px; color: #fff; background: var(--red); box-shadow: 0 12px 24px rgba(216,13,24,.18); font-size: 15px; font-weight: 850; white-space: nowrap; transition: background .2s ease, transform .2s ease; }
.header-phone:hover { background: var(--red-dark); transform: translateY(-1px); }
.header-phone svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.menu-toggle { display: none; border: 0; background: transparent; padding: 8px; }
.menu-toggle > span:not(.sr-only) { display: block; width: 25px; height: 2px; margin: 5px 0; background: var(--ink); }

.site-mega-menu { position: absolute; z-index: 1; top: 100%; left: 0; right: 0; visibility: hidden; opacity: 0; color: var(--ink); background: #fff; border-top: 1px solid var(--line); box-shadow: 0 28px 55px rgba(12,19,24,.16); transform: translateY(-10px); transition: opacity .2s ease, transform .2s ease, visibility .2s ease; }
.site-header.mega-open .site-mega-menu { visibility: visible; opacity: 1; transform: translateY(0); }
.mega-menu-inner { display: grid; grid-template-columns: 270px minmax(0, 1fr) 260px; min-height: 330px; }
.mega-intro { padding: 42px 38px; background: var(--soft); }
.mega-intro strong { display: block; font-size: 22px; }
.mega-intro p { margin: 16px 0 0; color: var(--muted); font-size: 14px; }
.mega-intro a { display: inline-flex; align-items: center; gap: 8px; margin-top: 34px; color: var(--red); font-weight: 750; }
.mega-intro a::after { content: "→"; }
.mega-groups { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px; padding: 42px 48px; border-right: 1px solid var(--line); }
.mega-group strong { display: block; padding-bottom: 14px; border-bottom: 1px solid var(--line); color: #8b9198; font-size: 12px; letter-spacing: .08em; }
.mega-group a { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 13px 0; font-size: 15px; font-weight: 680; }
.mega-group a::after { content: "→"; color: #c4c9ce; transition: color .2s ease, transform .2s ease; }
.mega-group a:hover { color: var(--red); }
.mega-group a:hover::after { color: var(--red); transform: translateX(3px); }
.mega-contact { display: flex; flex-direction: column; justify-content: space-between; padding: 42px 32px; background: #fff; }
.mega-contact span { color: var(--red); font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.mega-contact strong { display: block; margin-top: 9px; font-size: 23px; line-height: 1.3; }
.mega-contact p { margin: 13px 0 0; color: var(--muted); font-size: 13px; }
.mega-contact a { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; margin-top: 28px; padding: 0 18px; color: #fff; background: var(--red); font-weight: 780; }

.hero { position: relative; min-height: 650px; display: grid; align-items: center; overflow: hidden; background: #10161b; }
.hero-media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-video { background: #10161b; }
.hero-media-fallback { display: none; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,12,16,.94) 0%, rgba(7,12,16,.82) 35%, rgba(7,12,16,.22) 70%, rgba(7,12,16,.05) 100%); }
.hero-inner { position: relative; z-index: 1; }
.hero-copy { max-width: 700px; color: #fff; padding: 88px 0 82px; }
.hero h1 { margin: 0 0 24px; font-size: clamp(45px, 4.8vw, 72px); line-height: 1.15; letter-spacing: -.035em; }
.hero p { margin: 0; max-width: 650px; color: rgba(255,255,255,.84); font-size: clamp(17px, 1.55vw, 22px); }
.hero-actions, .contact-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.btn {
  min-height: 52px; display: inline-flex; align-items: center; justify-content: center; padding: 0 28px;
  border: 1px solid transparent; border-radius: 3px; cursor: pointer; font-weight: 750; transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #fff; background: var(--red); box-shadow: 0 13px 28px rgba(216,13,24,.23); }
.btn-primary:hover { background: var(--red-dark); }
.btn-ghost { color: #fff; background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.68); }
.btn-dark { color: #fff; background: var(--ink); }
.btn.full { width: 100%; }
.emergency-link { display: inline-flex; align-items: center; gap: 13px; margin-top: 46px; font-size: 19px; }
.emergency-link strong { font-size: 26px; letter-spacing: .02em; }
.pulse { width: 14px; height: 14px; border: 3px solid #fff; border-radius: 50%; box-shadow: 0 0 0 7px rgba(216,13,24,.72), 0 0 0 14px rgba(216,13,24,.18); }
.hero-proof { display: flex; align-items: center; gap: 18px; margin-top: 42px; padding-left: 18px; border-left: 3px solid var(--red); }
.hero-proof strong, .hero-proof span { display: block; }
.hero-proof span { color: rgba(255,255,255,.66); font-size: 14px; }

@media (prefers-reduced-motion: reduce) {
  .hero-video { display: none; }
  .hero-media-fallback { display: block; }
}

.trust-rail { border-bottom: 1px solid var(--line); background: #fff; }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.trust-grid > div { min-height: 115px; display: grid; grid-template-columns: 50px 1fr; grid-template-rows: auto auto; align-content: center; column-gap: 16px; padding: 20px 28px; border-right: 1px solid var(--line); }
.trust-grid > div:first-child { border-left: 1px solid var(--line); }
.trust-icon { grid-row: 1 / 3; align-self: center; display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid var(--ink); color: var(--red); font-size: 12px; font-weight: 800; }
.trust-grid strong { font-size: 16px; }
.trust-grid small { color: var(--muted); }

.section { padding: 100px 0; }
main section[id] { scroll-margin-top: 96px; }
.section-head { margin-bottom: 40px; }
.section-head.centered { text-align: center; }
.section-head h2, .about h2 { margin: 0; font-size: clamp(34px, 3.4vw, 50px); line-height: 1.18; letter-spacing: -.035em; }
.section-head p, .about-copy > p { margin: 14px 0 0; color: var(--muted); font-size: 17px; }
.section-head.centered::after { content: ""; display: block; width: 42px; height: 4px; margin: 22px auto 0; background: var(--red); }
.service-lines { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.service-lines article { position: relative; min-height: 280px; padding: 43px 40px 38px; border-right: 1px solid var(--line); }
.service-lines article:first-child { border-left: 1px solid var(--line); }
.line-number, .section-index { color: var(--red); font-size: 13px; font-weight: 800; letter-spacing: .12em; }
.service-lines h3 { margin: 28px 0 12px; font-size: 24px; }
.service-lines p { margin: 0 0 24px; color: var(--muted); }
.service-lines a, .text-link { color: var(--red); font-weight: 750; }

.industry-solutions { background: #fff; }
.industry-head { display: grid; grid-template-columns: 1.1fr .9fr; align-items: end; gap: 70px; }
.industry-head .section-index { display: block; margin-bottom: 12px; }
.industry-head p { margin: 0; padding-bottom: 5px; }
.industry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; background: #fff; }
.industry-card { position: relative; min-height: 410px; overflow: hidden; background: var(--ink); color: #fff; }
.industry-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .55s ease; }
.industry-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(8,12,15,.92) 0%, rgba(8,12,15,.15) 72%); }
.industry-card:hover img { transform: scale(1.035); }
.industry-card > div { position: absolute; z-index: 1; left: 0; right: 0; bottom: 0; padding: 34px 38px; }
.industry-card span { color: #ff3943; font-size: 12px; font-weight: 850; }
.industry-card h3 { margin: 7px 0 7px; font-size: 28px; }
.industry-card p { max-width: 430px; margin: 0; color: rgba(255,255,255,.72); }
.industry-card button { margin-top: 18px; padding: 0; border: 0; border-bottom: 1px solid rgba(255,255,255,.55); background: transparent; color: #fff; cursor: pointer; font-weight: 750; }
.scene-note { margin: 14px 0 0; color: var(--muted); font-size: 12px; }
.delivery-strip { padding: 74px 0; background: var(--graphite); color: #fff; }
.delivery-strip .shell { display: grid; grid-template-columns: 290px 1fr; gap: 65px; align-items: center; }
.delivery-strip h2 { margin: 8px 0 0; font-size: 34px; line-height: 1.25; }
.delivery-strip ol { display: grid; grid-template-columns: repeat(5, 1fr); margin: 0; padding: 0; list-style: none; }
.delivery-strip li { min-height: 110px; padding: 12px 20px; border-left: 1px solid rgba(255,255,255,.2); }
.delivery-strip li span, .delivery-strip li strong { display: block; }
.delivery-strip li span { color: var(--red); font-size: 12px; font-weight: 800; }
.delivery-strip li strong { margin-top: 20px; line-height: 1.45; }

.product-service { background: var(--soft); }
.product-layout { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(440px, .88fr); align-items: center; gap: 58px; }
.product-visual { position: relative; aspect-ratio: 4 / 3; min-height: 0; overflow: hidden; background: #101519; }
.product-visual > img, .product-visual > video { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.product-assembly-video { display: block; background: #101519; }
.product-assembly-fallback { display: none; }
.product-visual span { position: absolute; left: 18px; bottom: 16px; padding: 7px 10px; border-left: 2px solid var(--red); background: rgba(7,10,13,.74); color: rgba(255,255,255,.76); font-size: 10px; letter-spacing: .02em; }
.product-service .product-copy { padding: 12px 0; color: var(--ink); }
.product-copy .section-head { margin-bottom: 32px; }
.product-copy .section-head h2 { max-width: 560px; color: var(--ink); font-size: clamp(35px, 3vw, 40px); font-weight: 640; line-height: 1.16; letter-spacing: -.045em; text-wrap: balance; }
.product-copy .section-head p { max-width: 560px; margin-top: 18px; color: #59616a; font-size: 16px; line-height: 1.85; }
.service-selector { margin-bottom: 28px; border-top: 1px solid #cbd1d6; }
.service-tab { width: 100%; position: relative; display: grid; grid-template-columns: 38px 1fr 24px; align-items: center; gap: 14px; padding: 18px 14px; text-align: left; border: 0; border-bottom: 1px solid #cbd1d6; background: transparent; color: var(--ink); cursor: pointer; transition: background .2s ease, border-color .2s ease; }
.service-tab::after { content: "→"; grid-column: 3; grid-row: 1 / 3; font-size: 19px; font-weight: 400; }
.service-tab > span { grid-row: 1 / 3; color: #9aa1a8; font-weight: 800; }
.service-tab strong { font-size: 17px; font-weight: 650; letter-spacing: -.01em; }
.service-tab small { color: var(--muted); font-size: 12px; line-height: 1.55; }
.service-tab.active { border-top: 2px solid var(--red); background: #fff; box-shadow: none; }
.service-tab.active > span, .service-tab.active::after { color: var(--red); }
.product-cta { gap: 14px; min-height: 50px; padding-inline: 24px; box-shadow: none; }
.product-cta svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

.engine-finder { background: #fff; }
.engine-finder-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; }
.engine-finder-head > div:first-child { max-width: 790px; }
.engine-finder-head .section-index { display: block; margin-bottom: 14px; }
.source-stamp { flex: 0 0 auto; min-width: 250px; padding: 18px 22px; border-left: 3px solid var(--red); background: var(--soft); }
.source-stamp strong, .source-stamp span { display: block; }
.source-stamp strong { font-size: 16px; }
.source-stamp span { margin-top: 4px; color: var(--muted); font-size: 12px; }
.power-selector { display: grid; grid-template-columns: minmax(300px, 1.35fr) minmax(170px, .85fr) minmax(170px, .85fr) minmax(170px, .85fr); gap: 18px; align-items: start; padding: 34px; color: #fff; background: var(--graphite); }
.power-input-wrap > label, .frequency-field > label { display: block; margin-bottom: 9px; color: rgba(255,255,255,.72); font-size: 13px; font-weight: 700; }
.power-input { display: grid; grid-template-columns: 1fr auto; align-items: center; height: 58px; padding-right: 18px; background: #fff; color: var(--ink); }
.power-input input { min-width: 0; height: 100%; padding: 0 18px; border: 0; outline: 0; font-size: 22px; font-weight: 800; }
.power-input input[type="number"] { appearance: textfield; }
.power-input input[type="number"]::-webkit-inner-spin-button,
.power-input input[type="number"]::-webkit-outer-spin-button { margin: 0; appearance: none; }
.power-input span { color: var(--muted); font-weight: 750; }
.power-input-wrap small { display: block; margin-top: 8px; color: rgba(255,255,255,.52); font-size: 11px; }
.frequency-field select { width: 100%; height: 58px; padding: 0 14px; border: 1px solid rgba(255,255,255,.24); background: #fff; color: var(--ink); outline: 0; }
.power-submit { width: 100%; height: 58px; margin-top: 30px; }
.power-presets { grid-column: 1 / -1; display: grid; grid-template-columns: auto repeat(8, minmax(62px, 1fr)); align-items: center; gap: 9px; margin-top: 4px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); }
.power-presets > span { margin-right: 9px; color: rgba(255,255,255,.56); font-size: 12px; white-space: nowrap; }
.power-presets button { min-width: 0; padding: 9px 10px; border: 1px solid rgba(255,255,255,.22); background: transparent; color: #fff; cursor: pointer; }
.power-presets button:hover, .power-presets button.active { border-color: var(--red); background: var(--red); }
.matching-note { display: grid; grid-template-columns: 105px 1fr; gap: 18px; margin-top: 18px; padding: 17px 20px; border: 1px solid #ead6d8; background: #fff7f7; }
.matching-note strong { color: var(--red); }
.matching-note p { margin: 0; color: #5f4e50; font-size: 13px; }
.alternator-match { display: grid; grid-template-columns: auto 1fr auto; gap: 22px; align-items: center; margin-top: 36px; padding: 25px 28px; border: 1px solid #cfd5da; border-top: 4px solid var(--red); background: var(--soft); }
.alternator-brand { display: grid; grid-template-rows: 88px auto; place-items: center; width: 150px; min-height: 118px; overflow: hidden; border: 1px solid #d9dde1; background: #fff; }
.alternator-brand img { width: 136px; height: 82px; object-fit: contain; }
.alternator-brand span { width: 100%; padding: 7px 10px; color: #fff; background: var(--red); text-align: center; font-size: 15px; font-weight: 900; font-style: italic; letter-spacing: .04em; }
.alternator-match h3 { margin: 0; font-size: 23px; }
.alternator-match p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.alternator-match dl { display: flex; margin: 0; }
.alternator-match dl div { min-width: 126px; padding: 4px 20px; border-left: 1px solid #cbd1d6; }
.alternator-match dt { color: var(--muted); font-size: 10px; }
.alternator-match dd { margin: 4px 0 0; font-size: 16px; font-weight: 800; }
.alternator-match a { color: var(--red); font-size: 12px; font-weight: 750; }
.engine-results-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-top: 52px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.engine-results-head h3 { margin: 7px 0 0; font-size: 29px; }
.engine-results-head p { margin: 0; color: var(--muted); font-size: 14px; }
.engine-results { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; margin-top: 22px; }
.engine-card { position: relative; padding: 26px; border: 1px solid var(--line); background: #fff; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.engine-card:hover { transform: translateY(-3px); border-color: #c6cbd0; box-shadow: 0 16px 38px rgba(12,19,24,.08); }
.engine-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.engine-card-family { display: block; color: var(--muted); font-size: 12px; }
.engine-card h4 { margin: 6px 0 0; font-size: 21px; line-height: 1.25; overflow-wrap: anywhere; }
.verify-badge { flex: 0 0 auto; padding: 4px 7px; color: #8c5a00; background: #fff3d7; font-size: 10px; font-weight: 800; }
.generator-combination { display: grid; grid-template-columns: minmax(0,1fr) 66px minmax(0,1fr); gap: 12px; align-items: center; margin-top: 20px; padding: 18px; border: 1px solid #e1e4e7; background: #f7f8f9; }
.generator-component { min-width: 0; margin: 0; }
.component-image { height: 154px; display: grid; place-items: center; overflow: hidden; background: #fff; }
.component-image img { width: 100%; height: 100%; padding: 8px; object-fit: contain; }
.generator-component figcaption { display: grid; gap: 2px; margin-top: 9px; text-align: center; }
.generator-component figcaption span { color: var(--muted); font-size: 10px; }
.generator-component figcaption strong { font-size: 13px; overflow-wrap: anywhere; }
.power-coupling { display: grid; justify-items: center; gap: 5px; color: var(--red); }
.power-coupling svg { width: 60px; fill: #fff; stroke: currentColor; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.power-coupling span { font-size: 10px; font-weight: 800; white-space: nowrap; }
.combination-caption { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); align-items: start; gap: 20px; padding-top: 13px; border-top: 1px solid #dadddf; }
.combination-caption strong { color: var(--red); font-size: 13px; line-height: 1.55; }
.combination-caption span { color: var(--muted); font-size: 11px; line-height: 1.65; text-align: right; }
.combination-caption b { color: var(--ink); font-weight: 800; }
.featured-combination-copy { margin-top: 18px; padding: 20px; border-left: 3px solid var(--red); background: #f7f8f9; }
.featured-combination-copy p { margin: 0; color: #4f5861; font-size: 13px; line-height: 1.85; }
.featured-combination-copy > strong { display: block; margin-top: 14px; color: var(--ink); font-size: 14px; line-height: 1.7; }
.featured-combination-copy .technical-confirmation { margin-top: 13px; color: #7a4d00; }
.combination-sources { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 14px; }
.combination-sources a { color: var(--red); font-size: 12px; font-weight: 750; }
.engine-range { margin: 22px 0; padding: 17px; background: var(--soft); }
.engine-range span, .engine-range strong { display: block; }
.engine-range span { color: var(--muted); font-size: 11px; }
.engine-range strong { margin-top: 2px; color: var(--red); font-size: 24px; }
.engine-specs { display: grid; grid-template-columns: 1fr 1fr; margin: 0; border-top: 1px solid var(--line); }
.engine-specs > div { min-width: 0; padding: 12px 10px 10px 0; border-bottom: 1px solid var(--line); }
.engine-specs > div:nth-child(even) { padding-left: 12px; border-left: 1px solid var(--line); }
.engine-specs dt { color: var(--muted); font-size: 10px; }
.engine-specs dd { margin: 3px 0 0; font-size: 13px; font-weight: 700; overflow-wrap: anywhere; }
.engine-card-actions { display: grid; grid-template-columns: 1fr auto; gap: 10px; margin-top: 22px; }
.engine-card-actions .btn { min-height: 44px; padding-inline: 16px; font-size: 13px; }
.engine-source { display: inline-flex; align-items: center; padding: 0 10px; color: var(--red); font-size: 12px; font-weight: 750; }
.engine-empty { margin-top: 22px; padding: 45px 30px; border: 1px dashed #c8cdd2; text-align: center; background: var(--soft); }
.engine-empty strong { font-size: 20px; }
.engine-empty p { margin: 8px 0 0; color: var(--muted); }
.engine-load-error { border-color: #efc4c7; background: #fff5f5; }

.maintenance-band { position: relative; min-height: 690px; display: flex; align-items: center; color: #fff; background: #11161a; overflow: hidden; }
.maintenance-band > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.maintenance-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(12,16,19,.99) 0%, rgba(12,16,19,.96) 47%, rgba(12,16,19,.25) 82%); }
.maintenance-content { position: relative; z-index: 1; padding-block: 88px; }
.maintenance-copy { max-width: 720px; }
.maintenance-copy h2 { margin: 0; font-size: clamp(36px, 3.4vw, 50px); line-height: 1.2; }
.maintenance-copy p { max-width: 640px; margin: 14px 0 0; color: rgba(255,255,255,.7); font-size: 17px; }
.process-list { max-width: 820px; display: grid; grid-template-columns: repeat(4, 1fr); margin: 52px 0 0; padding: 0; list-style: none; }
.process-list li { min-height: 155px; padding: 0 22px; border-left: 1px solid rgba(255,255,255,.24); }
.process-list li:first-child { padding-left: 0; border-left: 0; }
.process-list span { color: var(--red); font-size: 14px; font-weight: 800; }
.process-list strong, .process-list small { display: block; }
.process-list strong { margin: 17px 0 8px; font-size: 17px; }
.process-list small { color: rgba(255,255,255,.62); line-height: 1.65; }
.maintenance-actions { display: flex; align-items: center; gap: 34px; margin-top: 38px; }
.maintenance-actions > a { display: flex; flex-direction: column; }
.maintenance-actions span { color: rgba(255,255,255,.6); font-size: 12px; }
.maintenance-actions strong { font-size: 24px; }
.image-note { display: block; margin-top: 24px; color: rgba(255,255,255,.5); }

.split-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; }
.button-link { padding: 0; border: 0; background: transparent; cursor: pointer; }
.home-case-grid { margin: 0 0 34px; }
.delivery-standard { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(320px, .65fr); border: 1px solid var(--line); background: #fff; }
.delivery-steps { display: grid; grid-template-columns: repeat(3, 1fr); }
.delivery-steps article { min-height: 330px; padding: 42px 34px; border-right: 1px solid var(--line); }
.delivery-steps article > span { color: var(--red); font-size: 13px; font-weight: 850; letter-spacing: .08em; }
.delivery-steps h3 { margin: 74px 0 14px; font-size: 25px; }
.delivery-steps p { margin: 0; color: var(--muted); line-height: 1.75; }
.delivery-evidence { padding: 42px; color: #fff; background: #161c21; }
.delivery-evidence h3 { margin: 14px 0 18px; font-size: 27px; line-height: 1.35; }
.delivery-evidence ul { margin: 0; padding-left: 20px; color: rgba(255,255,255,.78); }
.delivery-evidence li { margin: 11px 0; }
.delivery-evidence p { margin: 26px 0 0; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.18); color: rgba(255,255,255,.55); font-size: 13px; }

.after-sales { padding: 34px 0; background: var(--soft); border-block: 1px solid var(--line); }
.after-sales-layout { display: grid; grid-template-columns: 150px minmax(300px, 1.15fr) minmax(350px, .85fr) auto; align-items: center; gap: 34px; }
.after-sales-layout > img { width: 150px; height: 108px; object-fit: cover; object-position: center; }
.after-sales-copy h2 { margin: 6px 0 8px; font-size: clamp(25px, 2.2vw, 34px); line-height: 1.2; }
.after-sales-copy p { max-width: 620px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.65; }
.after-sales-items { display: grid; grid-template-columns: repeat(3, 1fr); border-left: 1px solid #cfd4d8; }
.after-sales-items span { display: grid; place-items: center; min-height: 58px; padding: 0 14px; border-right: 1px solid #cfd4d8; text-align: center; font-weight: 750; }
.after-sales .btn { white-space: nowrap; }

.about-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; align-items: center; }
.about-copy address { margin-top: 28px; color: var(--ink); font-style: normal; font-weight: 700; }
.about-links { display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 32px; }
.about-links button, .about-links a { padding: 0; border: 0; background: transparent; color: var(--red); font-weight: 750; cursor: pointer; }
.proof-board { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--line); }
.proof-board > div { min-height: 165px; padding: 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.proof-board > div:nth-child(even) { border-right: 0; }
.proof-board > div:nth-child(n+3) { border-bottom: 0; }
.proof-board span, .proof-board strong, .proof-board small { display: block; }
.proof-board span { color: var(--red); font-weight: 800; }
.proof-board strong { margin: 22px 0 5px; font-size: 20px; }
.proof-board small { color: var(--muted); }

.contact-band { padding: 62px 0; color: #fff; background: linear-gradient(115deg, #171d22, #0d1114); }
.contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 80px; align-items: center; }
.contact-layout h2 { margin: 0; max-width: 520px; font-size: clamp(32px, 3vw, 46px); line-height: 1.2; }
.contact-intro .section-index { display: block; margin-bottom: 10px; }
.contact-intro p { max-width: 650px; margin: 13px 0 0; color: rgba(255,255,255,.62); }
.contact-band .contact-actions { display: flex; gap: 12px; margin-top: 0; }
.site-footer { color: #fff; background: #071018; }
.footer-grid { display: grid; grid-template-columns: minmax(280px,1.05fr) minmax(210px,.62fr) minmax(380px,1.2fr); gap: clamp(42px,6vw,96px); align-items: start; padding-block: 64px 56px; }
.footer-grid.has-wechat { grid-template-columns: minmax(250px,1fr) minmax(190px,.62fr) minmax(330px,1.15fr) 148px; gap: clamp(28px,3.8vw,62px); }
.footer-brand img { display: block; width: min(300px,100%); height: auto; padding: 11px 14px; border-radius: 4px; background: #fff; }
.footer-brand p { max-width: 390px; margin: 24px 0 0; color: rgba(255,255,255,.68); font-size: 14px; line-height: 1.85; }
.footer-nav { min-width: 0; }
.footer-nav div { align-content: start; }
.footer-contact { min-width: 0; }
.footer-main { position: relative; display: grid; grid-template-columns: 1.15fr 1.35fr .8fr 82px; gap: 52px; align-items: start; padding-block: 58px 48px; }
.footer-logo { width: 300px; max-width: 100%; display: block; overflow: hidden; background: #fff; }
.footer-logo picture, .footer-logo img { display: block; width: 100%; }
.footer-logo img { height: auto; }
.footer-identity > strong { display: block; margin-top: 22px; font-size: 19px; }
.footer-identity p { max-width: 310px; margin: 7px 0 0; color: rgba(255,255,255,.55); font-size: 13px; }
.footer-contact h2, .footer-nav h2, .footer-wechat h2 { margin: 0 0 17px; color: rgba(255,255,255,.56); font-size: 12px; letter-spacing: .08em; }
.footer-contact address { display: grid; gap: 5px; font-style: normal; }
.footer-contact address span { color: rgba(255,255,255,.48); font-size: 11px; }
.footer-contact address strong { font-size: 15px; line-height: 1.65; }
.footer-contact address + address { margin-top: 12px; }
.footer-phones { display: flex; flex-wrap: wrap; gap: 9px 22px; margin-top: 18px; }
.footer-phones a { color: rgba(255,255,255,.58); font-size: 12px; }
.footer-phones strong { display: block; margin-top: 2px; color: #fff; font-size: 16px; }
.footer-nav div { display: grid; grid-template-columns: 1fr 1fr; gap: 9px 18px; }
.footer-nav a { color: rgba(255,255,255,.68); font-size: 13px; }
.footer-nav a:hover, .footer-meta a:hover, .footer-resources a:hover { color: #fff; }
.footer-wechat { min-width: 0; }
.footer-wechat-code { display: block; width: 132px; height: 132px; padding: 6px; border-radius: 3px; background: #fff; box-shadow: 0 12px 30px rgba(0,0,0,.22); transition: transform .2s ease, box-shadow .2s ease; }
.footer-wechat-code:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(0,0,0,.3); }
.footer-wechat-code img { display: block; width: 120px; height: 120px; object-fit: contain; }
.footer-wechat > strong { display: block; margin-top: 13px; font-size: 14px; }
.footer-wechat > span { display: block; margin-top: 3px; color: rgba(255,255,255,.5); font-size: 11px; line-height: 1.5; }
.back-to-top { width: 82px; height: 82px; display: grid; place-items: center; align-content: center; gap: 2px; border: 1px solid rgba(255,255,255,.24); color: #fff; background: rgba(255,255,255,.04); font-size: 11px; transition: border-color .2s ease, background .2s ease; }
.back-to-top:hover { border-color: var(--red); background: var(--red); }
.back-to-top svg { width: 25px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.footer-meta { border-top: 1px solid rgba(255,255,255,.15); }
.footer-meta .shell { min-height: 66px; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 28px; color: rgba(255,255,255,.72); font-size: 12px; text-align: center; }
.footer-meta a { color: rgba(255,255,255,.72); }
.footer-resources { border-top: 1px solid rgba(255,255,255,.08); background: #050c12; }
.footer-resources .shell { min-height: 62px; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 24px; color: rgba(255,255,255,.32); font-size: 12px; }
.footer-resources a { color: rgba(255,255,255,.42); }
.mobile-contact-bar { display: none; }
.cms-managed-section { padding-bottom: 0; }
.cms-managed-section .cms-richtext, .region-managed-content .cms-richtext { max-width: 920px; padding: clamp(26px,4vw,48px); border-left: 3px solid var(--red); background: #fff; color: #30363b; font-size: 16px; line-height: 1.9; box-shadow: 0 18px 50px rgba(16,24,32,.06); }
.cms-managed-section .cms-richtext > :first-child, .region-managed-content .cms-richtext > :first-child { margin-top: 0; }
.cms-managed-section .cms-richtext > :last-child, .region-managed-content .cms-richtext > :last-child { margin-bottom: 0; }
.cms-records-section { padding-top: 54px; }

@media (max-width: 1050px) {
  .footer-grid { grid-template-columns: minmax(0,1fr) minmax(320px,1fr); gap: 42px 64px; }
  .footer-grid.has-wechat { grid-template-columns: minmax(0,1fr) minmax(320px,1fr); gap: 42px 64px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-brand p { max-width: 620px; }
  .footer-grid.has-wechat .footer-wechat { grid-column: 1 / -1; display: grid; grid-template-columns: 112px 1fr; grid-template-rows: auto auto 1fr; column-gap: 20px; align-items: start; }
  .footer-grid.has-wechat .footer-wechat h2 { grid-column: 1 / -1; }
  .footer-grid.has-wechat .footer-wechat-code { grid-row: 2 / 4; width: 112px; height: 112px; }
  .footer-grid.has-wechat .footer-wechat-code img { width: 100px; height: 100px; }
  .footer-grid.has-wechat .footer-wechat > strong { margin-top: 5px; }
}

/* Standalone content pages */
.page-hero { position: relative; min-height: 470px; display: grid; align-items: end; overflow: hidden; color: #fff; background: #10161a; }
.page-hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.page-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(7,12,16,.96), rgba(7,12,16,.55) 58%, rgba(7,12,16,.18)); }
.page-hero .shell { position: relative; z-index: 1; padding-block: 100px 74px; }
.page-hero h1 { max-width: 800px; margin: 0; font-size: clamp(45px, 5vw, 70px); line-height: 1.12; letter-spacing: -.04em; }
.page-hero p { max-width: 720px; margin: 20px 0 0; color: rgba(255,255,255,.78); font-size: 19px; }
.page-hero .hero-actions { margin-top: 30px; }
.page-intro { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; align-items: start; }
.page-intro h2, .content-section h2 { margin: 0; font-size: clamp(34px, 3.5vw, 50px); line-height: 1.18; letter-spacing: -.035em; }
.page-intro p, .content-section p { color: var(--muted); }
.fact-lines { border-top: 1px solid var(--line); }
.fact-lines > div { display: grid; grid-template-columns: 160px 1fr; gap: 30px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.fact-lines strong { font-size: 18px; }
.fact-lines span { color: var(--muted); }
.content-band { background: var(--soft); }
.config-grid { display: grid; grid-template-columns: repeat(3,1fr); border: 1px solid var(--line); background: #fff; }
.config-grid article { min-height: 280px; padding: 38px; border-right: 1px solid var(--line); }
.config-grid article:last-child { border-right: 0; }
.config-grid span { color: var(--red); font-size: 13px; font-weight: 850; }
.config-grid h3 { margin: 24px 0 10px; font-size: 25px; }
.config-grid p { margin: 0; }
.checklist-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: start; }
.checklist { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.checklist li { display: grid; grid-template-columns: 34px 1fr; gap: 15px; padding: 19px 0; border-bottom: 1px solid var(--line); }
.checklist li::before { content: "✓"; display: grid; place-items: center; width: 24px; height: 24px; color: #fff; background: var(--red); font-size: 12px; font-weight: 900; }
.cta-panel { padding: 60px; color: #fff; background: var(--graphite); }
.cta-panel h2 { margin: 0; font-size: clamp(32px,3vw,46px); }
.cta-panel p { color: rgba(255,255,255,.66); }
.detail-industries { display: grid; gap: 2px; }
.industry-detail { display: grid; grid-template-columns: 1fr 1fr; min-height: 460px; background: var(--graphite); color: #fff; }
.industry-detail:nth-child(even) img { order: 2; }
.industry-detail img { width: 100%; height: 100%; object-fit: cover; }
.industry-detail > div { display: flex; flex-direction: column; justify-content: center; padding: 58px; }
.industry-detail h2 { margin: 8px 0 12px; font-size: 38px; }
.industry-detail p { color: rgba(255,255,255,.68); }
.industry-detail ul { margin: 18px 0 28px; padding-left: 18px; color: rgba(255,255,255,.82); }
.industry-detail button { align-self: flex-start; }
.service-matrix { display: grid; grid-template-columns: repeat(2,1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.service-matrix article { padding: 38px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.service-matrix h3 { margin: 8px 0 8px; font-size: 24px; }
.service-matrix p { margin: 0; }
.company-contact { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: start; }
.company-contact address { padding: 30px; border-left: 4px solid var(--red); background: var(--soft); font-style: normal; font-weight: 750; }
.plain-link { padding: 0; border: 0; background: transparent; color: var(--red); font-weight: 750; cursor: pointer; }
.region-entry { overflow: hidden; background: #171c21; color: #fff; }
.region-entry-layout { display: grid; grid-template-columns: minmax(300px,.72fr) minmax(0,1.28fr); gap: clamp(54px,7vw,110px); align-items: start; }
.region-entry-copy { position: sticky; top: 112px; }
.region-entry-copy .section-index { color: #f04b54; }
.region-entry-copy h2 { max-width: 540px; margin: 14px 0 22px; font-size: clamp(38px,4.2vw,62px); line-height: 1.08; letter-spacing: -.045em; }
.region-entry-copy p { max-width: 520px; margin: 0; color: rgba(255,255,255,.66); font-size: 16px; line-height: 1.85; }
.region-entry-all { display: inline-flex; align-items: center; gap: 12px; margin-top: 36px; padding-bottom: 9px; border-bottom: 1px solid rgba(255,255,255,.38); color: #fff; font-weight: 720; }
.region-entry-all svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; transition: transform .2s ease; }
.region-entry-all:hover { color: #ff6069; border-color: #ff6069; }
.region-entry-all:hover svg { transform: translateX(4px); }
.region-city-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid rgba(255,255,255,.18); border-left: 1px solid rgba(255,255,255,.18); }
.region-city-grid a { position: relative; min-height: 182px; display: flex; flex-direction: column; padding: 25px 24px 23px; border-right: 1px solid rgba(255,255,255,.18); border-bottom: 1px solid rgba(255,255,255,.18); color: #fff; transition: background .2s ease, color .2s ease; }
.region-city-grid a > span { color: rgba(255,255,255,.44); font-size: 11px; font-weight: 720; letter-spacing: .14em; }
.region-city-grid strong { margin-top: 22px; font-size: 27px; line-height: 1; }
.region-city-grid small { max-width: 170px; margin-top: 13px; color: rgba(255,255,255,.56); font-size: 12px; line-height: 1.55; }
.region-city-grid b { position: absolute; right: 21px; top: 20px; color: rgba(255,255,255,.35); font-size: 21px; font-weight: 400; transition: transform .2s ease, color .2s ease; }
.region-city-grid a:hover { background: var(--red); }
.region-city-grid a:hover > span, .region-city-grid a:hover small { color: rgba(255,255,255,.82); }
.region-city-grid a:hover b { color: #fff; transform: translateX(4px); }
.insights-section { background: #f7f8f9; }
.insights-title-row { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 38px; }
.insights-title-row h2 { margin: 0; font-size: clamp(34px,3.4vw,50px); line-height: 1.18; }
.insights-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; }
.insight-column { background: #fff; border-top: 4px solid var(--red); }
.insight-column header { display: flex; align-items: center; justify-content: space-between; padding: 27px 30px 20px; }
.insight-column h3 { margin: 0; font-size: 28px; }
.insight-column header a { color: var(--red); font-size: 13px; font-weight: 750; }
.insight-list { margin: 0; padding: 0 30px 24px; list-style: none; }
.insight-list li { border-top: 1px solid var(--line); }
.insight-list a { min-height: 78px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; color: #31373d; }
.insight-list a::before { content: ""; width: 7px; height: 7px; border: 2px solid var(--red); border-radius: 50%; }
.insight-list strong { font-size: 16px; font-weight: 650; line-height: 1.45; }
.insight-list time { color: #959ca3; font-size: 12px; white-space: nowrap; }
.insight-list a:hover strong { color: var(--red); }
.seo-note { margin-top: 24px; padding: 18px 22px; border-left: 3px solid var(--red); background: #fff; color: var(--muted); font-size: 13px; }
.archive-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.archive-group { border-top: 4px solid var(--red); background: #fff; }
.archive-group h2 { margin: 0; padding: 28px 30px; font-size: 30px; }
.archive-group .insight-list { padding-bottom: 28px; }
.article-page { background: #fff; }
.article-header { padding: 90px 0 52px; border-bottom: 1px solid var(--line); }
.article-header .shell { max-width: 980px; }
.article-header h1 { margin: 12px 0 20px; font-size: clamp(40px,4.5vw,62px); line-height: 1.2; letter-spacing: -.04em; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px 28px; color: var(--muted); font-size: 13px; }
.article-layout { width: min(980px,calc(100% - 48px)); display: grid; grid-template-columns: minmax(0,1fr) 250px; gap: 70px; margin: 0 auto; padding: 68px 0 100px; }
.article-body { font-size: 17px; line-height: 1.95; }
.article-body h2 { margin: 48px 0 14px; font-size: 30px; line-height: 1.35; }
.article-body p { color: #3d444b; }
.article-body ul { padding-left: 22px; }
.article-body li { margin: 10px 0; }
.article-aside { align-self: start; position: sticky; top: 110px; padding: 25px; border-top: 4px solid var(--red); background: var(--soft); }
.article-aside strong, .article-aside a { display: block; }
.article-aside a { margin-top: 14px; color: var(--red); font-weight: 700; }

@media (max-width: 900px) {
  .page-intro, .checklist-layout, .company-contact { grid-template-columns: 1fr; gap: 40px; }
  .config-grid { grid-template-columns: 1fr; }
  .config-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .industry-detail { grid-template-columns: 1fr; }
  .industry-detail:nth-child(even) img { order: 0; }
  .industry-detail img { height: 340px; }
  .insights-columns, .archive-grid { grid-template-columns: 1fr; gap: 35px; }
  .article-layout { grid-template-columns: 1fr; gap: 35px; }
  .article-aside { position: static; }
}

@media (max-width: 600px) {
  .page-hero { min-height: 540px; }
  .page-hero .shell { padding-block: 160px 56px; }
  .page-hero h1 { font-size: 39px; }
  .page-hero p { font-size: 16px; }
  .fact-lines > div { grid-template-columns: 1fr; gap: 6px; }
  .cta-panel { padding: 34px 26px; }
  .industry-detail img { height: 260px; }
  .industry-detail > div { padding: 34px 25px; }
  .industry-detail h2 { font-size: 31px; }
  .service-matrix { grid-template-columns: 1fr; }
  .insights-title-row { align-items: flex-start; flex-direction: column; }
  .insight-list { padding-inline: 20px; }
  .insight-column header { padding-inline: 20px; }
  .insight-list a { grid-template-columns: auto 1fr; padding: 14px 0; }
  .insight-list time { grid-column: 2; }
  .article-header { padding: 65px 0 40px; }
  .article-layout { width: calc(100% - 28px); padding-block: 45px 76px; }
  .article-body { font-size: 16px; }
}

.inquiry-dialog { width: min(620px, calc(100% - 28px)); padding: 0; border: 0; border-radius: 4px; box-shadow: var(--shadow); }
.inquiry-dialog::backdrop { background: rgba(7,12,16,.76); backdrop-filter: blur(4px); }
.dialog-card { position: relative; padding: 42px; }
.dialog-card h2 { margin: 8px 0; font-size: 32px; }
.dialog-card > p { margin: 0 0 25px; color: var(--muted); }
.dialog-close { position: absolute; right: 16px; top: 12px; width: 38px; height: 38px; border: 0; background: transparent; font-size: 28px; cursor: pointer; }
.dialog-card label { display: grid; gap: 7px; margin-top: 16px; color: #30363b; font-size: 14px; font-weight: 650; }
.dialog-card input, .dialog-card textarea, .dialog-card select { width: 100%; padding: 13px 14px; border: 1px solid #cbd1d6; border-radius: 2px; background: #fff; color: var(--ink); outline: none; }
.dialog-card input:focus, .dialog-card textarea:focus, .dialog-card select:focus { border-color: var(--red); box-shadow: 0 0 0 3px rgba(216,13,24,.1); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.privacy-check { display: flex !important; grid-template-columns: 20px 1fr; align-items: center; font-weight: 500 !important; }
.privacy-check input { width: 17px; height: 17px; accent-color: var(--red); }
.dialog-card .btn { margin-top: 22px; }
.form-success { margin-top: 16px; padding: 12px 14px; color: #155d34; background: #e8f6ed; }
.toast { position: fixed; left: 50%; bottom: 30px; z-index: 100; max-width: min(460px, calc(100% - 32px)); padding: 13px 18px; transform: translateX(-50%); background: var(--ink); color: #fff; box-shadow: var(--shadow); }

@media (max-width: 1180px) {
  .header-phone { display: none; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 14px; }
  .trust-grid > div { padding-inline: 18px; }
  .contact-layout { grid-template-columns: 1fr; gap: 45px; }
  .after-sales-layout { grid-template-columns: 120px 1fr auto; }
  .after-sales-layout > img { width: 120px; }
  .after-sales-items { grid-column: 2 / -1; }
  .engine-results { grid-template-columns: 1fr 1fr; }
  .region-entry-layout { grid-template-columns: minmax(260px,.7fr) minmax(0,1.3fr); gap: 48px; }
  .region-city-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}

@media (max-width: 900px) {
  :root { --shell: min(100% - 32px, 720px); }
  main section[id] { scroll-margin-top: 72px; }
  .site-header { height: 72px; }
  .header-inner { justify-content: space-between; }
  .menu-toggle { display: block; }
  .brand img { width: 196px; }
  .site-nav { display: none; position: absolute; top: 72px; left: -16px; right: -16px; align-self: auto; padding: 12px 16px 22px; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 24px 40px rgba(0,0,0,.12); }
  .site-nav.open { display: grid; grid-template-columns: 1fr 1fr; }
  .site-nav a { padding: 12px 10px; }
  .site-nav a::after { display: none; }
  .nav-caret, .site-mega-menu { display: none; }
  .hero { min-height: 650px; }
  .hero-media { object-position: 64% center; }
  .hero-shade { background: linear-gradient(90deg, rgba(7,12,16,.96), rgba(7,12,16,.72)); }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-grid > div:nth-child(2) { border-right: 1px solid var(--line); }
  .service-lines, .product-layout, .about-layout { grid-template-columns: 1fr; }
  .industry-head { grid-template-columns: 1fr; gap: 10px; }
  .industry-grid { grid-template-columns: 1fr 1fr; }
  .industry-card { min-height: 360px; }
  .delivery-strip .shell { grid-template-columns: 1fr; gap: 30px; }
  .delivery-strip ol { grid-template-columns: repeat(3, 1fr); }
  .delivery-strip li:nth-child(n+4) { border-top: 1px solid rgba(255,255,255,.2); }
  .delivery-standard { grid-template-columns: 1fr; }
  .delivery-steps article:last-child { border-right: 0; }
  .engine-finder-head { align-items: flex-start; flex-direction: column; }
  .source-stamp { width: 100%; }
  .power-selector { grid-template-columns: 1fr 1fr; }
  .power-input-wrap { grid-column: 1 / -1; }
  .power-submit { grid-column: 1 / -1; margin-top: 0; }
  .power-presets { grid-template-columns: repeat(4, 1fr); }
  .power-presets > span { grid-column: 1 / -1; margin-right: 0; }
  .alternator-match { grid-template-columns: auto 1fr; }
  .alternator-match dl { grid-column: 1 / -1; }
  .engine-results { grid-template-columns: 1fr; }
  .service-lines article { min-height: auto; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .service-lines article:last-child { border-bottom: 0; }
  .product-layout { grid-template-columns: 1fr; gap: 42px; }
  .product-visual { min-height: 0; }
  .maintenance-band { min-height: 860px; }
  .maintenance-band > img { object-position: 65% center; }
  .maintenance-overlay { background: rgba(12,16,19,.87); }
  .process-list { grid-template-columns: 1fr 1fr; gap: 26px 0; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 42px 56px; }
  .back-to-top { justify-self: end; }
  .region-entry-layout { grid-template-columns: 1fr; }
  .region-entry-copy { position: static; }
  .region-entry-copy h2 { max-width: 650px; }
}

@media (max-width: 600px) {
  :root { --shell: calc(100% - 28px); }
  body { padding-bottom: 58px; }
  .brand img { width: 184px; }
  .hero { min-height: 690px; align-items: end; }
  .hero-media { object-position: 61% center; }
  .hero-shade { background: linear-gradient(0deg, rgba(7,12,16,.97) 15%, rgba(7,12,16,.7) 75%, rgba(7,12,16,.35)); }
  .hero-copy { padding: 200px 0 52px; }
  .hero h1 { max-width: 350px; font-size: 36px; line-height: 1.22; }
  .hero h1 br { display: none; }
  .hero p { font-size: 16px; }
  .hero-actions { display: grid; grid-template-columns: 1fr; gap: 10px; margin-top: 28px; }
  .hero-proof { align-items: flex-start; flex-direction: column; gap: 2px; margin-top: 28px; }
  .btn { min-height: 50px; padding-inline: 18px; }
  .emergency-link { margin-top: 38px; font-size: 15px; }
  .emergency-link strong { font-size: 20px; }
  .trust-grid { grid-template-columns: 1fr; }
  .trust-grid > div { border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .trust-grid > div:last-child { border-bottom: 0; }
  .section { padding: 76px 0; }
  .section-head h2, .about h2 { font-size: 35px; }
  .service-lines article { padding: 32px 27px; }
  .industry-grid { grid-template-columns: 1fr; }
  .industry-card { min-height: 350px; }
  .industry-card > div { padding: 27px 24px; }
  .industry-card h3 { font-size: 25px; }
  .delivery-strip { padding: 58px 0; }
  .delivery-strip ol { grid-template-columns: 1fr; }
  .delivery-strip li, .delivery-strip li:nth-child(n+4) { min-height: auto; padding: 15px 0; border-left: 0; border-top: 1px solid rgba(255,255,255,.18); }
  .delivery-strip li strong { margin-top: 5px; }
  .after-sales { padding: 28px 0; }
  .after-sales-layout { grid-template-columns: 86px 1fr; gap: 20px; }
  .after-sales-layout > img { width: 86px; height: 86px; }
  .after-sales-copy h2 { font-size: 25px; }
  .after-sales-copy p { font-size: 13px; }
  .after-sales-items { grid-column: 1 / -1; }
  .after-sales-items span { min-height: 48px; padding: 0 8px; font-size: 13px; }
  .after-sales .btn { grid-column: 1 / -1; width: 100%; }
  .region-entry-layout { gap: 42px; }
  .region-entry-copy h2 { font-size: 36px; line-height: 1.16; }
  .region-entry-copy p { font-size: 15px; }
  .region-entry-all { width: 100%; justify-content: space-between; margin-top: 28px; }
  .region-city-grid { grid-template-columns: 1fr 1fr; }
  .region-city-grid a { min-height: 148px; padding: 20px 17px; }
  .region-city-grid strong { margin-top: 18px; font-size: 23px; }
  .region-city-grid small { padding-right: 4px; font-size: 11px; }
  .region-city-grid b { right: 15px; top: 15px; }
  .product-visual { min-height: 0; aspect-ratio: 4 / 3; }
  .product-service .product-copy { padding-top: 0; }
  .product-copy .section-head h2 { font-size: 32px; line-height: 1.2; }
  .product-copy .section-head p { font-size: 15px; line-height: 1.75; }
  .service-tab { grid-template-columns: 32px 1fr 22px; gap: 10px; padding: 17px 8px; }
  .product-cta { width: 100%; }
  .power-selector { grid-template-columns: 1fr; padding: 25px 20px; }
  .power-input-wrap, .power-presets { grid-column: auto; }
  .power-submit { grid-column: auto; }
  .power-presets { grid-template-columns: repeat(4, 1fr); margin-top: 2px; padding-top: 16px; }
  .power-presets > span { grid-column: 1 / -1; width: 100%; }
  .matching-note { grid-template-columns: 1fr; gap: 5px; }
  .alternator-match { grid-template-columns: 1fr; padding: 22px; }
  .alternator-brand { justify-self: start; width: 134px; min-height: 106px; grid-template-rows: 76px auto; }
  .alternator-brand img { width: 120px; height: 72px; }
  .alternator-match dl { grid-column: auto; display: grid; grid-template-columns: 1fr 1fr; }
  .alternator-match dl div { min-width: 0; padding: 10px 12px 10px 0; border-left: 0; border-top: 1px solid #cbd1d6; }
  .engine-results-head { align-items: flex-start; flex-direction: column; }
  .engine-results { grid-template-columns: 1fr; }
  .engine-card { padding: 22px; }
  .generator-combination { grid-template-columns: minmax(0,1fr) 40px minmax(0,1fr); gap: 7px; padding: 12px; }
  .component-image { height: 112px; }
  .component-image img { padding: 5px; }
  .power-coupling svg { width: 38px; }
  .power-coupling span { font-size: 8px; }
  .generator-component figcaption strong { font-size: 11px; }
  .combination-caption { grid-template-columns: 1fr; gap: 7px; }
  .combination-caption span { text-align: left; }
  .maintenance-band { min-height: 1020px; }
  .maintenance-content { padding-block: 70px; }
  .maintenance-copy h2 { font-size: 36px; }
  .process-list { grid-template-columns: 1fr; gap: 0; }
  .process-list li, .process-list li:first-child { min-height: auto; padding: 20px 0; border-left: 0; border-bottom: 1px solid rgba(255,255,255,.2); }
  .maintenance-actions { align-items: flex-start; flex-direction: column; }
  .split-head { align-items: flex-start; flex-direction: column; }
  .delivery-steps { grid-template-columns: 1fr; }
  .delivery-steps article { min-height: auto; padding: 28px; border-right: 0; border-bottom: 1px solid var(--line); }
  .delivery-steps h3 { margin: 28px 0 9px; }
  .delivery-evidence { padding: 28px; }
  .proof-board { grid-template-columns: 1fr; }
  .proof-board > div { border-right: 0; border-bottom: 1px solid var(--line) !important; }
  .proof-board > div:last-child { border-bottom: 0 !important; }
  .contact-band { padding: 54px 0; }
  .contact-layout h2 { font-size: 34px; }
  .contact-band .contact-actions { display: grid; grid-template-columns: 1fr; width: 100%; }
  .footer-main { grid-template-columns: 1fr; gap: 34px; padding-block: 46px 38px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; padding-block: 44px 38px; }
  .footer-grid.has-wechat { grid-template-columns: 1fr; gap: 34px; }
  .footer-brand { grid-column: auto; }
  .footer-brand img { width: min(270px,100%); }
  .footer-brand p { margin-top: 18px; }
  .footer-logo { width: min(270px, calc(100% - 82px)); }
  .footer-nav div { grid-template-columns: repeat(3,1fr); }
  .footer-grid.has-wechat .footer-wechat { grid-column: auto; }
  .back-to-top { position: absolute; top: 46px; right: 0; width: 68px; height: 68px; }
  .footer-meta .shell, .footer-resources .shell { align-items: flex-start; justify-content: flex-start; flex-direction: column; gap: 7px; padding-block: 20px; text-align: left; }
  .footer-resources .shell { min-height: auto; flex-direction: row; }
  .mobile-contact-bar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 48; display: grid; grid-template-columns: 1fr 1.35fr; height: 58px; background: var(--ink); }
  .mobile-contact-bar a { display: grid; place-items: center; color: #fff; font-weight: 750; }
  .mobile-contact-bar .urgent { background: var(--red); }
  .dialog-card { padding: 36px 22px 26px; }
  .dialog-card h2 { font-size: 27px; }
  .form-grid { grid-template-columns: 1fr; gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
  .product-assembly-video { display: none; }
  .product-assembly-fallback { display: block; }
}