:root {
  --ink: #191b1e;
  --muted: #62666b;
  --red: #d71920;
  --red-dark: #a70f14;
  --red-text: #a70f14;
  --red-on-dark: #ff6b70;
  --graphite: #17191c;
  --steel: #8b9096;
  --paper: #f3f3f1;
  --white: #fff;
  --line: #d8d9d8;
  --shadow: 0 22px 60px rgba(15, 17, 19, .12);
  --max: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Arial, Helvetica, sans-serif; line-height: 1.62; }
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible { outline: 3px solid rgba(215,25,32,.45); outline-offset: 3px; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 10px 14px; background: #fff; }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid #dedede; background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
.site-header::before { content: ""; display: block; height: 4px; background: linear-gradient(90deg, var(--red) 0 31%, #292c30 31% 100%); }
.header-inner { width: min(var(--max), calc(100% - 48px)); min-height: 76px; margin: auto; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; margin-right: auto; }
.brand-mark { display: block; width: 44px; height: 44px; border-radius: 50%; background: #f5f4e9; box-shadow: 0 0 0 1px rgba(21,24,27,.12); }
.brand strong { display: block; color: #161719; font-size: 20px; line-height: 1.05; letter-spacing: -.04em; }
.brand small { display: block; margin-top: 3px; color: #74787d; font-size: 10px; letter-spacing: .11em; text-transform: uppercase; }
.site-nav { display: flex; align-items: center; gap: 26px; color: #34373b; font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.site-nav a { padding: 10px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--red); border-color: var(--red); }
.menu-toggle { display: none; border: 1px solid #bbb; background: #fff; padding: 8px 12px; color: var(--ink); }
.header-cta, .button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 11px 20px; border: 1px solid var(--red); background: var(--red); color: #fff; font-weight: 900; line-height: 1.2; transition: .2s ease; }
.header-cta:hover, .button:hover { background: var(--red-dark); border-color: var(--red-dark); transform: translateY(-1px); }
.button.secondary { border-color: #a6a9ac; background: transparent; color: inherit; }
.button.secondary:hover { border-color: var(--red); background: rgba(215,25,32,.08); color: inherit; }

.breadcrumb { width: min(var(--max), calc(100% - 48px)); margin: 24px auto 0; display: flex; gap: 8px; flex-wrap: wrap; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.breadcrumb a { color: var(--red); font-weight: 800; }

.catalog-hero { position: relative; overflow: hidden; background: var(--graphite); color: #fff; }
.catalog-hero::before { content: ""; position: absolute; inset: 0; background: linear-gradient(115deg, transparent 0 63%, rgba(215,25,32,.16) 63% 66%, transparent 66%); pointer-events: none; }
.catalog-hero-inner { position: relative; width: min(var(--max), calc(100% - 48px)); min-height: 650px; margin: auto; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(360px, .85fr); align-items: stretch; }
.catalog-hero .hero-copy { align-self: center; padding: 72px 70px 72px 0; }
.eyebrow { margin: 0 0 14px; color: var(--red-text); font-size: 11px; font-weight: 900; letter-spacing: .17em; text-transform: uppercase; }
.catalog-hero .eyebrow, .section.dark .eyebrow, .section.charcoal .eyebrow, .product-hero .eyebrow, .market-section .eyebrow { color: var(--red-on-dark); }
h1, h2, h3 { margin: 0; line-height: 1.07; letter-spacing: -.035em; }
h1 { max-width: 780px; font-size: clamp(45px, 6.2vw, 82px); text-wrap: balance; overflow-wrap: break-word; }
h2 { font-size: clamp(31px, 4vw, 50px); }
h3 { font-size: 20px; }
.lead { max-width: 720px; margin: 22px 0 0; color: #4d5156; font-size: clamp(17px, 2vw, 20px); }
.catalog-hero .lead { color: #c6c9cd; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
.hero-checks { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.hero-checks span { padding: 7px 10px; border-left: 2px solid var(--red); background: rgba(255,255,255,.07); color: #d9dbde; font-size: 12px; font-weight: 800; }
.catalog-hero .hero-media { position: relative; min-height: 650px; overflow: hidden; background: #eee; }
.catalog-hero .hero-media::before { content: ""; position: absolute; z-index: 2; left: 0; top: 0; bottom: 0; width: 16px; background: var(--red); clip-path: polygon(0 0,100% 0,32% 100%,0 100%); }
.catalog-hero .hero-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 56%; }
.media-index { position: absolute; z-index: 3; top: 22px; right: 22px; padding: 7px 10px; background: #17191c; color: #fff; font-size: 10px; font-weight: 900; letter-spacing: .16em; }
.hero-note { position: absolute; z-index: 3; left: 28px; right: 28px; bottom: 28px; padding: 17px 18px; border-left: 4px solid var(--red); background: rgba(23,25,28,.9); color: #fff; }
.hero-note strong { display: block; font-size: 16px; }
.hero-note small { display: block; margin-top: 4px; color: #c6c9cd; }

.spec-rail { width: min(var(--max), calc(100% - 48px)); margin: 0 auto 36px; display: grid; grid-template-columns: repeat(4, 1fr); background: #fff; box-shadow: var(--shadow); }
.spec-rail div { min-width: 0; padding: 19px 22px; border-right: 1px solid var(--line); }
.spec-rail div:last-child { border: 0; }
.spec-rail strong, .spec-rail span { display: block; }
.spec-rail strong { font-size: 14px; }
.spec-rail span { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; }

.hero { width: min(var(--max), calc(100% - 48px)); margin: 28px auto 38px; display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(330px, .8fr); background: #fff; box-shadow: var(--shadow); }
.hero > * { min-width: 0; }
.hero .hero-copy { padding: clamp(34px, 5vw, 70px); }
.hero .hero-media { position: relative; min-height: 490px; overflow: hidden; background: #e8e8e6; }
.hero .hero-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.product-hero .hero-media img { object-fit: contain; padding: 26px; background: #fff; }
.product-hero .hero-copy { border-top: 7px solid var(--red); background: var(--graphite); color: #fff; }
.product-hero .lead { color: #c8cbd0; }
.product-hero .button.secondary { color: #fff; }

.section { width: min(var(--max), calc(100% - 48px)); margin: 0 auto 36px; padding: clamp(34px, 5vw, 62px); border-top: 1px solid var(--line); background: #fff; }
.section.tint { background: #e9e9e6; }
.section.dark, .section.charcoal { background: var(--graphite); color: #fff; border-color: #33363a; }
.section.dark .muted, .section.charcoal p { color: #bec1c5; }
.section-head { max-width: 900px; margin-bottom: 32px; }
.split-head { max-width: none; display: grid; grid-template-columns: 1fr minmax(280px, .72fr); gap: 48px; align-items: end; }
.split-head > p { margin: 0; }
.muted { color: var(--muted); }
.grid { display: grid; gap: 18px; }
.grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid.four { grid-template-columns: repeat(4, minmax(0,1fr)); }
.card { min-width: 0; padding: 22px; border: 1px solid var(--line); background: #fff; }
.card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.card-link { cursor: pointer; transition: .2s ease; }
.card-link:hover { transform: translateY(-3px); border-color: #aeb0b2; box-shadow: 0 15px 30px rgba(0,0,0,.12); }
.card-link:focus-visible { position: relative; z-index: 2; outline: 3px solid var(--red); outline-offset: 3px; }
.card-link .arrow, .text-link { display: inline-block; margin-top: 15px; color: var(--red-text); font-weight: 900; }

.system-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.system-card { min-width: 0; min-height: 138px; display: grid; grid-template-columns: 34px 1fr; gap: 12px; padding: 20px 17px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.system-card .number { color: var(--red); font: 900 13px/1 Arial, sans-serif; }
.system-card p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
.system-card .arrow { margin-top: 12px; font-size: 11px; line-height: 1.35; }
.part-card { display: grid; grid-template-rows: 195px auto; overflow: hidden; background: #fff; color: var(--ink); }
.part-card-media { position: relative; border-bottom: 1px solid #ddd; overflow: hidden; background: #fff; }
.part-card-media img { width: 100%; height: 100%; object-fit: contain; padding: 15px; transition: transform .25s ease; }
.part-card:hover img { transform: scale(1.035); }
.part-card-media span { position: absolute; left: 0; bottom: 0; padding: 6px 10px; background: var(--graphite); color: #fff; font-size: 11px; font-weight: 900; }
.part-card-body { padding: 23px; }
.part-card-body > p:not(.part-type) { color: var(--muted); font-size: 13px; }
.part-type { margin: 0 0 7px; color: var(--red) !important; font-size: 10px !important; font-weight: 900; letter-spacing: .13em; text-transform: uppercase; }
.reference { display: inline-flex; margin-top: 12px; padding: 5px 8px; background: #eee; color: #333; font-size: 12px; font-weight: 850; }

.engine-category-hero .hero-media img { object-position: 50% 52%; }
.engine-category-hero .hero-checks span { background: #efefed; color: #4d5054; }
#engine-parts-list { scroll-margin-top: 92px; }
.engine-groups { align-items: stretch; }
.engine-group { padding: 0; overflow: hidden; }
.engine-group-head { min-height: 78px; display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; padding: 19px 20px; border-bottom: 1px solid var(--line); background: var(--graphite); color: #fff; }
.engine-group-head span { color: var(--red); font-size: 12px; font-weight: 900; }
.engine-group-head h3 { margin: 0; font-size: 18px; }
.engine-group ul { margin: 0; padding: 18px 22px 22px 39px; }
.engine-group li { margin: 0 0 7px; color: #4d5054; font-size: 13px; }
.engine-group li:last-child { margin-bottom: 0; }
.engine-group-detail { display: flex; justify-content: space-between; gap: 14px; margin: 0 20px 20px; padding: 13px 14px; border-left: 3px solid var(--red); background: #f1f1ef; color: var(--red); font-size: 13px; font-weight: 900; }
.engine-group-detail:hover { background: #e8e8e5; }
.timing-kit-hero .hero-media { background: #fff; }
.timing-kit-hero .hero-media img { padding: 0; object-fit: cover; }
.kit-scope-grid .number { display: block; margin-bottom: 18px; color: var(--red); font-size: 12px; font-weight: 900; }
.source-note { margin: 18px 0 0; color: var(--muted); font-size: 12px; }
.editorial-link { color: var(--red); font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
.timing-risk { margin-bottom: 36px; }
.engine-final-hero .hero-media { background: #fff; }
.engine-final-hero .hero-media img { padding: 0; object-fit: cover; }
.engine-technical-grid .number { display: block; margin-bottom: 18px; color: var(--red); font-size: 12px; font-weight: 900; }
.evidence-panel { border-top: 5px solid var(--red); }
.evidence-record { display: grid; grid-template-columns: .7fr 1.15fr 1.15fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.evidence-record > div { min-width: 0; padding: 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.evidence-record > div:first-child { display: flex; flex-direction: column; justify-content: center; background: var(--graphite); color: #fff; }
.evidence-record > div:first-child > span:first-child { color: #c7cacf; font-size: 11px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.evidence-record > div:first-child > strong { margin-top: 9px; color: #fff; font-size: clamp(28px,4vw,44px); line-height: 1; overflow-wrap: anywhere; }
.evidence-secondary { display: block; margin-top: 14px; color: #c7cacf; font-size: 12px; }
.evidence-record h3 { margin-bottom: 10px; }
.evidence-record p { margin: 0; color: var(--muted); font-size: 14px; }
.engine-part-risk { margin-bottom: 36px; }
.charcoal .card p { color: var(--muted); }
.related-systems .card h3 { color: var(--ink); }
.related-systems .card .number { color: var(--red); }
.contextual-source { margin: 22px 0 0; padding: 15px 17px; border-left: 3px solid var(--red); background: #fff; color: var(--muted); font-size: 14px; }
.contextual-source a, .wholesale-section .section-head a { color: var(--red); font-weight: 850; text-decoration: underline; text-underline-offset: 3px; }

.generation-band { display: grid; grid-template-columns: .78fr 1.22fr; gap: 55px; background: #e6e6e3; }
.generation-intro { align-self: center; }
.generation-cards { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid #bfc1c2; border-left: 1px solid #bfc1c2; }
.generation-cards article { padding: 25px; border-right: 1px solid #bfc1c2; border-bottom: 1px solid #bfc1c2; }
.generation-cards span { color: var(--red-text); font-size: 11px; font-weight: 900; letter-spacing: .09em; }
.generation-cards p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
.generation-list { display: grid; gap: 1px; background: var(--line); }
.generation-row { display: grid; grid-template-columns: 110px 1fr 1.8fr; gap: 16px; padding: 17px; background: #fff; }
.generation-row strong { color: var(--red); }

.step-grid { display: grid; grid-template-columns: repeat(4,1fr); }
.step-grid article { min-width: 0; padding: 24px; border-top: 3px solid #282b2f; border-right: 1px solid var(--line); background: #f5f5f3; }
.step-grid article:last-child { border-right: 0; }
.step-grid span { color: var(--red); font-size: 29px; font-weight: 900; }
.step-grid p { color: var(--muted); font-size: 13px; }
.market-section { display: grid; grid-template-columns: 1.4fr .6fr; gap: 55px; background: var(--graphite); color: #fff; }
.market-section p { color: #c3c6ca; }
.market-section aside { padding: 27px; border-top: 4px solid var(--red); background: #25282c; }
.market-section ul { margin: 14px 0 0; padding-left: 19px; color: #d4d6d8; }

.table-wrap { overflow-x: auto; }
table { width: 100%; min-width: 760px; border-collapse: collapse; }
th, td { padding: 15px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--graphite); color: #fff; font-size: 11px; text-transform: uppercase; letter-spacing: .07em; }

.quote { display: grid; grid-template-columns: .8fr 1.2fr; gap: 34px; align-items: start; }
.contact-list { display: grid; gap: 12px; margin-top: 25px; }
.contact-line { padding: 14px; border-left: 3px solid var(--red); background: rgba(255,255,255,.07); }
.rfq-points { display: grid; gap: 9px; margin: 24px 0 0; padding-left: 19px; color: #d4d6d8; font-size: 13px; }
.rfq-points li::marker { color: var(--red); }
.copy-button { margin-left: 6px; border: 1px solid rgba(255,255,255,.35); background: transparent; color: #fff; font-size: 11px; }
.rfq-form { display: grid; gap: 14px; padding: 26px; background: #fff; color: var(--ink); }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
label { display: grid; gap: 6px; font-size: 13px; font-weight: 800; }
input, textarea, select { width: 100%; border: 1px solid #c7c9cb; border-radius: 0; background: #fff; padding: 12px; color: var(--ink); }
textarea { min-height: 145px; resize: vertical; }
input:focus, textarea:focus, select:focus { outline: 3px solid rgba(215,25,32,.2); border-color: var(--red); }
.form-hint { margin: -5px 0 0; color: var(--muted); font-size: 12px; font-weight: 500; }
.privacy-check { grid-template-columns: 22px 1fr; align-items: start; font-weight: 500; }
.privacy-check input { width: 20px; height: 20px; }
.form-status { min-height: 22px; margin: 0; color: var(--muted); font-size: 13px; }
.form-status[data-type="success"] { color: #18733b; }
.form-status[data-type="error"] { color: #b11920; }
.form-status[data-type="pending"] { color: #4d5156; }
.hp-field { position: absolute !important; left: -9999px !important; width: 1px !important; height: 1px !important; }
.rfq-form button[type="submit"] { min-height: 49px; border: 0; background: var(--red); color: #fff; font-weight: 900; cursor: pointer; }
.rfq-form button[type="submit"]:disabled { cursor: wait; opacity: .65; }

.faq { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.faq details { padding: 19px 20px; background: #fff; }
.faq summary { cursor: pointer; font-weight: 850; }
.faq p { color: var(--muted); }
.legal p, .legal li { color: #4c5054; }
.notice { padding: 15px 17px; border-left: 4px solid var(--red); background: #f6e8e8; color: #6f2024; }

.footer { margin-top: 44px; padding: 46px 0 25px; border-top: 6px solid var(--red); background: #111316; color: #fff; }
.footer-inner { width: min(var(--max), calc(100% - 48px)); margin: auto; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 30px; }
.footer p, .footer small { color: #afb3b7; }
.footer a { color: #fff; }
.footer a:hover { color: #ff6a70; }
.footer-system-nav { margin-top: 30px; padding-top: 24px; border-top: 1px solid #35383c; }
.footer-system-nav > strong { display: block; margin-bottom: 14px; }
.footer-system-nav > div { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 9px 24px; }
.footer-system-nav a { font-size: 13px; color: #c6c9cc; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-top: 30px; padding-top: 21px; border-top: 1px solid #35383c; font-size: 12px; color: #989ca1; }
.footer-links { display: flex; gap: 17px; flex-wrap: wrap; }
.disclaimer { max-width: 780px; }
.mobile-action-bar { display: none; }

@media (max-width: 960px) {
  .menu-toggle { display: inline-flex; }
  .site-nav { display: none; position: absolute; left: 24px; right: 24px; top: 76px; padding: 18px; flex-direction: column; align-items: stretch; border-top: 4px solid var(--red); background: #fff; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .header-cta { display: none; }
  .catalog-hero-inner, .hero { grid-template-columns: 1fr; }
  .catalog-hero .hero-copy { padding: 58px 0 48px; }
  .catalog-hero .hero-media { min-height: 470px; }
  .spec-rail { grid-template-columns: 1fr 1fr; }
  .system-grid { grid-template-columns: 1fr 1fr; }
  .grid.three, .grid.four { grid-template-columns: 1fr 1fr; }
  .split-head, .generation-band, .market-section { grid-template-columns: 1fr; gap: 28px; }
  .step-grid { grid-template-columns: 1fr 1fr; }
  .footer-system-nav > div { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .evidence-record { grid-template-columns: 1fr; }
  .quote { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { padding-bottom: 62px; }
  .header-inner, .section, .hero, .breadcrumb, .footer-inner, .catalog-hero-inner, .spec-rail { width: min(100% - 24px, var(--max)); }
  .header-inner { min-height: 66px; }
  .brand small { display: none; }
  .brand-mark { width: 39px; height: 39px; }
  .brand strong { font-size: 17px; }
  .catalog-hero .hero-copy { padding: 42px 0 35px; }
  .catalog-hero .hero-media { min-height: 390px; }
  .catalog-hero .hero-media img { object-position: 50% 60%; }
  .hero .hero-copy { padding: 30px 22px; }
  .hero .hero-media { min-height: 320px; }
  .system-category-hero .hero-media { min-height: 0; display: grid; gap: 14px; padding: 14px; background: #fff; }
  .system-category-hero .hero-media img { position: relative; inset: auto; width: 100%; height: auto; padding: 0; object-fit: contain; }
  .system-category-hero .hero-note { position: relative; left: auto; right: auto; bottom: auto; padding: 15px 16px; }
  .section { padding: 31px 19px; }
  .spec-rail { grid-template-columns: 1fr 1fr; margin-bottom: 24px; }
  .spec-rail div { padding: 14px 12px; }
  .system-grid, .grid.two, .grid.three, .grid.four, .generation-cards, .step-grid, .form-row, .faq { grid-template-columns: 1fr; }
  .system-card { min-height: 0; }
  .step-grid article { border-right: 0; border-bottom: 1px solid var(--line); }
  .generation-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-system-nav > div { grid-template-columns: 1fr; }
  h1 { font-size: 39px; }
  h2 { font-size: 31px; }
  .hero-actions .button { flex: 1 1 100%; text-align: center; }
  .mobile-action-bar { position: fixed; z-index: 30; left: 0; right: 0; bottom: 0; display: grid; grid-template-columns: 1fr 1fr; min-height: 58px; border-top: 1px solid #45484c; background: #111316; box-shadow: 0 -8px 24px rgba(0,0,0,.18); }
  .mobile-action-bar a { display: grid; place-items: center; color: #fff; font-size: 13px; font-weight: 900; text-transform: uppercase; letter-spacing: .04em; }
  .mobile-action-bar a:last-child { background: var(--red); }
}