:root {
  --ink: #091018;
  --deep: #050a10;
  --deep-2: #0a131d;
  --panel: #0f1b27;
  --line: rgba(255,255,255,.12);
  --line-dark: rgba(9,16,24,.13);
  --white: #f6f8fb;
  --paper: #f4f6f8;
  --muted: #aeb9c5;
  --muted-dark: #5e6a75;
  --blue: #4aa3e9;
  --blue-deep: #164c78;
  --red: #e22b32;
  --red-dark: #a21923;
  --radius: 18px;
  --shadow: 0 22px 70px rgba(2, 12, 23, .16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.55; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.section-dark { color: var(--white); background: var(--deep); }
.section-light { color: var(--ink); background: #eef2f5; }
.section-white { color: var(--ink); background: #fff; }
.top-strip { display: flex; justify-content: space-between; gap: 20px; padding: 8px 5vw; color: #b3c2cf; background: #03070b; border-bottom: 1px solid rgba(255,255,255,.08); font: 600 10px/1 Inter, sans-serif; letter-spacing: .18em; text-transform: uppercase; }

.site-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 17px 5vw; color: var(--white); background: rgba(5,10,16,.86); border-bottom: 1px solid rgba(255,255,255,.10); backdrop-filter: blur(16px); }
.wordmark { display: inline-flex; align-items: center; gap: 10px; letter-spacing: .04em; }
.wordmark-icon { display: grid; place-items: center; width: 35px; height: 35px; color: var(--white); background: linear-gradient(135deg, var(--blue), #1e4e75); border-radius: 50%; font: 800 12px/1 Inter, sans-serif; letter-spacing: -.08em; }
.wordmark strong, .wordmark small { display: block; line-height: 1.05; }
.wordmark strong { font: 800 13px/1 Inter, sans-serif; }
.wordmark small { margin-top: 3px; color: var(--blue); font: 700 10px/1 Inter, sans-serif; letter-spacing: .25em; }
.main-nav { display: flex; align-items: center; gap: 26px; color: #b9c4cf; font-size: 13px; font-weight: 600; }
.main-nav a:hover, .text-link:hover, .footer-links a:hover { color: var(--blue); }
.header-price { padding: 9px 14px; color: var(--white); border: 1px solid rgba(74,163,233,.65); border-radius: 999px; font-size: 13px; font-weight: 800; white-space: nowrap; }
.header-price span { color: var(--blue); margin-left: 6px; }

.hero { position: relative; min-height: 780px; overflow: hidden; background: #050b11; }
.hero-bg { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,10,16,.98) 0%, rgba(5,10,16,.87) 35%, rgba(5,10,16,.15) 67%, rgba(5,10,16,.12) 100%), url('assets/hero-workshop.png') 67% center / cover no-repeat; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, .96fr) minmax(320px, .8fr); align-items: center; min-height: 780px; padding-top: 62px; padding-bottom: 86px; }
.hero-copy { max-width: 635px; }
.eyebrow { display: flex; align-items: center; gap: 11px; margin: 0 0 22px; color: #b9cad8; font: 700 11px/1.2 Inter, sans-serif; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow.dark { color: var(--blue-deep); }
.eyebrow-line { display: inline-block; width: 35px; height: 2px; background: var(--blue); }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: "Barlow Condensed", Impact, sans-serif; }
h1 { margin-bottom: 22px; font-size: clamp(74px, 10vw, 132px); line-height: .81; letter-spacing: -.015em; font-weight: 800; }
h1 em, h2 em { color: var(--blue); font-style: normal; }
.hero-lead { max-width: 590px; margin-bottom: 12px; color: var(--white); font-size: clamp(20px, 2.2vw, 28px); line-height: 1.22; font-weight: 700; }
.hero-body { max-width: 570px; margin-bottom: 29px; color: #bdc8d2; font-size: 16px; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 12px; min-height: 50px; padding: 15px 22px; border: 0; border-radius: 6px; cursor: pointer; font-size: 12px; font-weight: 800; letter-spacing: .06em; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
.button span { font-size: 17px; line-height: 1; }
.button:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0,0,0,.22); }
.button-primary { color: #fff; background: var(--red); }
.button-primary:hover { background: #f13d44; }
.button-dark { color: #fff; background: var(--ink); }
.button-dark:hover { background: var(--blue-deep); }
.button.full { width: 100%; }
.text-link { color: #d3dde6; font-size: 13px; font-weight: 700; }
.text-link span { margin-left: 8px; color: var(--blue); font-size: 18px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 12px 27px; margin-top: 27px; color: #aab7c2; font-size: 11px; }
.hero-meta b { color: var(--white); }
.disclaimer { margin-top: 22px; color: #81909d; font-size: 10px; }
.hero-side { position: relative; min-height: 450px; }
.floating-spec { position: absolute; display: grid; grid-template-columns: auto 1fr; column-gap: 10px; align-items: center; min-width: 190px; padding: 13px 17px; color: var(--white); background: rgba(7,16,25,.74); border: 1px solid rgba(255,255,255,.17); border-radius: 9px; backdrop-filter: blur(12px); box-shadow: var(--shadow); }
.floating-spec b { font-size: 15px; }
.floating-spec small { grid-column: 2; color: #adc0ce; font-size: 10px; }
.spec-top { top: 26%; right: 4%; }
.spec-bottom { right: 17%; bottom: 12%; }
.spec-dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; box-shadow: 0 0 16px currentColor; }
.spec-dot.blue { color: var(--blue); background: var(--blue); }
.spec-dot.red { color: var(--red); background: var(--red); }
.scroll-cue { position: absolute; bottom: 24px; left: 5vw; display: flex; align-items: center; gap: 10px; color: #8998a5; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; }
.scroll-cue span { display: inline-block; width: 20px; height: 30px; border: 1px solid rgba(255,255,255,.35); border-radius: 999px; }

.section-heading { max-width: 720px; }
.section-heading.centered { margin-right: auto; margin-left: auto; text-align: center; }
.section-heading.centered .eyebrow { justify-content: center; }
h2 { margin-bottom: 17px; font-size: clamp(47px, 6vw, 78px); line-height: .93; letter-spacing: -.01em; font-weight: 700; }
.section-heading > p:not(.eyebrow) { max-width: 620px; color: var(--muted); font-size: 16px; }
.section-light .section-heading > p:not(.eyebrow), .section-white .section-heading > p:not(.eyebrow) { color: var(--muted-dark); }

.engine-section { padding: 122px 0 135px; background: radial-gradient(circle at 78% 35%, rgba(25,75,118,.33), transparent 30%), var(--deep-2); }
.engine-explorer { margin-top: 57px; border: 1px solid var(--line); background: rgba(255,255,255,.035); border-radius: var(--radius); overflow: hidden; }
.engine-tabs { display: flex; border-bottom: 1px solid var(--line); }
.engine-tab { flex: 1; padding: 18px 20px; color: #8696a5; background: transparent; border: 0; border-right: 1px solid var(--line); cursor: pointer; font: 700 23px/1 "Barlow Condensed", sans-serif; text-align: left; transition: background .2s ease, color .2s ease; }
.engine-tab:last-child { border-right: 0; }
.engine-tab small { display: block; margin-top: 5px; color: #6f7f8d; font: 500 10px/1 Inter, sans-serif; letter-spacing: .12em; text-transform: uppercase; }
.engine-tab.active { color: var(--white); background: linear-gradient(90deg, rgba(74,163,233,.18), transparent); }
.engine-tab.active small { color: var(--blue); }
.engine-display { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr); align-items: center; min-height: 445px; }
.engine-art { padding: 24px; }
.engine-art img { width: 100%; max-height: 410px; object-fit: contain; filter: drop-shadow(0 20px 38px rgba(0,0,0,.38)); transition: opacity .22s ease, transform .22s ease; }
.engine-info { padding: 36px 42px 36px 15px; border-left: 1px solid var(--line); }
.engine-kicker { margin-bottom: 10px; color: var(--blue); font-size: 10px; font-weight: 800; letter-spacing: .14em; }
.engine-info h3 { margin-bottom: 15px; font-size: 90px; line-height: .8; }
.engine-info > p:not(.engine-kicker):not(.figure-note) { color: #c0cad2; font-size: 15px; }
.engine-points { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0; }
.engine-points span { padding: 8px 10px; color: #dbe8f1; border: 1px solid rgba(74,163,233,.35); border-radius: 4px; font-size: 10px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.figure-note { color: #748391; font-size: 10px; }

.problem-section { padding: 120px 0 80px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: center; }
.question-stack { display: grid; gap: 11px; }
.question-card { display: grid; grid-template-columns: 45px 1fr; align-items: center; min-height: 66px; padding: 11px 15px; background: rgba(255,255,255,.75); border: 1px solid rgba(9,16,24,.1); border-radius: 7px; box-shadow: 0 8px 22px rgba(25,39,52,.05); }
.question-card span { color: var(--blue); font: 700 16px/1 "Barlow Condensed", sans-serif; }
.question-card p { margin: 0; font-size: 14px; font-weight: 700; }
.solution-line { display: flex; align-items: center; gap: 13px; margin-top: 66px; color: var(--blue-deep); font-size: 14px; }
.solution-mark { display: grid; place-items: center; width: 28px; height: 28px; color: #fff; background: var(--blue); border-radius: 50%; font-size: 22px; line-height: 1; }
.solution-rule { width: 80px; height: 2px; background: var(--blue); }

.product-section { padding: 130px 0; }
.product-grid { display: grid; grid-template-columns: minmax(330px, .9fr) minmax(0, 1fr); gap: 100px; align-items: center; }
.book-stage { position: relative; min-height: 555px; display: grid; place-items: center; }
.book-cover { position: relative; z-index: 1; width: min(330px, 74%); aspect-ratio: .705; padding: 30px 24px; overflow: hidden; color: #fff; background: linear-gradient(145deg, #0d1b28, #050b12 65%); border: 1px solid rgba(74,163,233,.42); box-shadow: 24px 28px 44px rgba(4,11,18,.28); transform: rotate(-6deg); }
.cover-grid { position: absolute; inset: 0; opacity: .42; background-image: linear-gradient(rgba(74,163,233,.12) 1px, transparent 1px), linear-gradient(90deg, rgba(74,163,233,.12) 1px, transparent 1px); background-size: 28px 28px; transform: skewY(-13deg) scale(1.4); }
.book-cover > *:not(.cover-grid) { position: relative; z-index: 1; }
.cover-label { margin-bottom: 30px; color: #a9c6da; font-size: 7px; font-weight: 800; letter-spacing: .18em; }
.book-cover h3 { margin-bottom: 15px; font-size: 62px; line-height: .77; }
.book-cover h3 span { color: var(--blue); }
.cover-sub { color: #b9c5cf; font-size: 8px; letter-spacing: .06em; }
.cover-engine { position: absolute; right: -15%; bottom: 13%; width: 120%; opacity: .8; transform: rotate(3deg); }
.cover-engine img { filter: saturate(.82) brightness(.64) contrast(1.2); }
.cover-footer { position: absolute; right: 24px; bottom: 23px; color: var(--blue); font-size: 8px; font-weight: 800; letter-spacing: .12em; }
.book-shadow { position: absolute; width: 270px; height: 28px; bottom: 62px; background: rgba(4,10,16,.28); filter: blur(18px); border-radius: 50%; transform: rotate(-7deg); }
.stage-tag { position: absolute; right: 0; bottom: 105px; display: flex; align-items: center; gap: 8px; padding: 10px 13px; color: var(--ink); background: #fff; border-radius: 4px; box-shadow: var(--shadow); font-size: 10px; font-weight: 800; }
.proof-list { display: grid; gap: 13px; margin: 27px 0 31px; }
.proof-list span { color: var(--ink); font-size: 13px; font-weight: 700; }
.proof-list b { display: inline-grid; place-items: center; width: 20px; height: 20px; margin-right: 8px; color: #fff; background: var(--blue); border-radius: 50%; font-size: 12px; }

.modules-section { padding: 125px 0; }
.module-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 54px; }
.module-card { min-height: 166px; padding: 22px; background: rgba(255,255,255,.8); border: 1px solid rgba(9,16,24,.11); border-radius: 8px; transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease; }
.module-card:hover { border-color: rgba(74,163,233,.7); box-shadow: 0 15px 30px rgba(20,40,56,.08); transform: translateY(-4px); }
.module-card.alert { border-top: 3px solid var(--red); }
.module-icon { display: grid; place-items: center; width: 32px; height: 32px; margin-bottom: 15px; color: var(--blue-deep); background: #e4f1fa; border-radius: 6px; font-size: 19px; font-weight: 800; }
.module-card.alert .module-icon { color: var(--red); background: #f9e4e6; }
.module-card h3 { margin-bottom: 5px; font-size: 26px; line-height: 1; }
.module-card p { margin: 0; color: var(--muted-dark); font-size: 12px; line-height: 1.4; }

.motors-section { padding: 125px 0; background: radial-gradient(circle at 82% 15%, rgba(38,103,158,.3), transparent 25%), var(--deep); }
.motor-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; margin-top: 53px; }
.motor-card { border: 1px solid var(--line); background: rgba(255,255,255,.035); border-radius: 10px; overflow: hidden; }
.motor-card.featured { border-color: rgba(74,163,233,.67); box-shadow: 0 0 0 1px rgba(74,163,233,.12), 0 20px 50px rgba(0,0,0,.22); }
.motor-image { height: 235px; padding: 9px; background: #fff; }
.motor-image img { width: 100%; height: 100%; object-fit: contain; }
.motor-copy { padding: 22px; }
.motor-copy p { margin-bottom: 7px; color: var(--blue); font-size: 9px; font-weight: 800; letter-spacing: .12em; }
.motor-copy h3 { margin-bottom: 8px; font-size: 57px; line-height: .8; }
.motor-copy span { display: block; color: #b1bfca; font-size: 12px; }

.compat-section { padding: 125px 0; }
.compat-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 54px; }
.compat-card { position: relative; min-height: 176px; padding: 21px; overflow: hidden; background: linear-gradient(145deg, #f8fafc, #e8edf1); border: 1px solid #d6dde4; border-radius: 8px; }
.compat-card::after { position: absolute; right: -15px; bottom: -23px; color: rgba(74,163,233,.12); content: attr(data-series); font: 900 110px/.8 "Barlow Condensed", sans-serif; }
.compat-card span { color: var(--blue); font-size: 10px; font-weight: 800; }
.compat-card h3 { margin: 33px 0 5px; font-size: 29px; line-height: 1; }
.compat-card p { margin: 0; color: var(--muted-dark); font-size: 11px; line-height: 1.45; }

.vehicle-section { padding: 120px 0; }
.vehicle-grid { display: grid; grid-template-columns: minmax(250px, .75fr) minmax(0, 1.25fr); gap: 55px; align-items: center; }
.vehicle-visual { position: relative; min-height: 490px; overflow: hidden; background: url('assets/hero-workshop.png') 76% center / cover no-repeat; border-radius: 12px; box-shadow: var(--shadow); }
.vehicle-visual::after { position: absolute; inset: 0; pointer-events: none; content: ''; background: linear-gradient(90deg, rgba(6,13,20,.36), transparent 55%, rgba(6,13,20,.1)); }
.hotspot { position: absolute; z-index: 1; display: flex; align-items: center; gap: 6px; cursor: pointer; color: #fff; font-size: 10px; font-weight: 800; text-shadow: 0 2px 8px #000; transition: transform .2s ease; }
.hotspot:hover, .hotspot.active { transform: scale(1.08); }
.hotspot span { display: block; width: 14px; height: 14px; background: var(--blue); border: 3px solid rgba(255,255,255,.9); border-radius: 50%; box-shadow: 0 0 0 7px rgba(74,163,233,.23), 0 0 22px rgba(74,163,233,.85); }
.hotspot.active span { background: var(--red); box-shadow: 0 0 0 7px rgba(226,43,50,.2), 0 0 22px rgba(226,43,50,.85); }
.hotspot-engine { top: 61%; left: 22%; }
.hotspot-brakes { top: 65%; right: 16%; }
.hotspot-suspension { top: 76%; left: 41%; }
.hotspot-transmission { top: 53%; left: 51%; }
.hotspot-electric { top: 29%; right: 15%; }
.hotspot-info { display: grid; gap: 5px; margin-top: 32px; padding: 19px; background: #fff; border-left: 3px solid var(--blue); box-shadow: 0 12px 30px rgba(20,40,56,.06); }
.hotspot-info b { font: 700 28px/1 "Barlow Condensed", sans-serif; }
.hotspot-info span { color: var(--muted-dark); font-size: 12px; }

.symptoms-section { padding: 125px 0; }
.symptom-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 52px; }
.symptom-card { display: grid; grid-template-columns: 42px 1fr; align-items: center; min-height: 90px; padding: 15px 18px; background: rgba(255,255,255,.045); border: 1px solid var(--line); border-radius: 7px; }
.symptom-card span { color: var(--blue); font: 700 19px/1 "Barlow Condensed", sans-serif; }
.symptom-card p { margin: 0; color: #dce4ea; font-size: 13px; font-weight: 700; }

.maintenance-section { padding: 125px 0; }
.timeline { display: grid; grid-template-columns: repeat(6, 1fr); position: relative; gap: 0; margin-top: 62px; }
.timeline::before { position: absolute; top: 25px; right: 6%; left: 6%; height: 2px; background: #d2e4f1; content: ''; }
.timeline-item { position: relative; z-index: 1; display: flex; align-items: center; flex-direction: column; gap: 15px; text-align: center; }
.timeline-item b { display: grid; place-items: center; width: 54px; height: 54px; color: #fff; background: var(--blue-deep); border: 7px solid #e9f2f8; border-radius: 50%; font: 700 16px/1 "Barlow Condensed", sans-serif; }
.timeline-item span { max-width: 140px; color: var(--muted-dark); font-size: 11px; line-height: 1.4; }
.maintenance-note { display: flex; align-items: center; gap: 12px; max-width: 580px; margin: 58px auto 0; padding: 15px 18px; background: #f5fbff; border: 1px solid #cfe8f7; border-radius: 6px; }
.maintenance-note span { display: grid; place-items: center; width: 25px; height: 25px; color: #fff; background: var(--blue); border-radius: 50%; }
.maintenance-note p { margin: 0; color: var(--muted-dark); font-size: 12px; }

.value-section { padding: 125px 0; }
.value-grid { display: grid; grid-template-columns: 1fr .82fr; gap: 80px; align-items: center; }
.value-stack { display: grid; gap: 9px; }
.value-stack div { display: flex; justify-content: space-between; padding: 16px 18px; color: #334351; background: #fff; border: 1px solid #d9e0e6; border-radius: 5px; font-size: 13px; font-weight: 700; }
.value-stack div span { color: var(--blue); font-weight: 900; }
.value-stack strong { margin-top: 16px; padding: 18px; color: #fff; background: var(--blue-deep); border-radius: 5px; font-size: 17px; text-align: center; }

.offer-section { padding: 130px 0; background: radial-gradient(circle at 18% 60%, rgba(27,86,132,.38), transparent 35%), var(--deep); }
.offer-grid { display: grid; grid-template-columns: 1fr .74fr; gap: 90px; align-items: center; }
.offer-copy > p:not(.eyebrow) { max-width: 600px; color: #afbdc8; font-size: 16px; }
.offer-bullets { display: grid; grid-template-columns: 1fr 1fr; gap: 13px 28px; margin-top: 31px; color: #dce6ed; font-size: 12px; font-weight: 700; }
.offer-bullets span::first-letter { color: var(--blue); }
.price-card { padding: 31px; color: var(--ink); background: #fff; border-top: 4px solid var(--red); border-radius: 9px; box-shadow: 0 28px 80px rgba(0,0,0,.27); }
.price-label { margin-bottom: 9px; color: var(--red); font-size: 10px; font-weight: 900; letter-spacing: .17em; }
.price { margin-bottom: 12px; font: 700 30px/1 "Barlow Condensed", sans-serif; }
.price strong { font-size: 78px; letter-spacing: -.03em; }
.price-card > p:not(.price-label) { margin-bottom: 26px; color: var(--muted-dark); font-size: 12px; }
.price-card small { display: block; margin-top: 15px; color: #7a8792; font-size: 10px; text-align: center; }

.faq-section { padding: 125px 0; }
.faq-grid { display: grid; grid-template-columns: .78fr 1.1fr; gap: 100px; align-items: start; }
.faq-list { border-top: 1px solid #d3dce3; }
details { border-bottom: 1px solid #d3dce3; }
summary { position: relative; padding: 19px 35px 19px 0; cursor: pointer; list-style: none; color: var(--ink); font-size: 14px; font-weight: 800; }
summary::-webkit-details-marker { display: none; }
summary::after { position: absolute; top: 17px; right: 2px; color: var(--blue); content: '+'; font-size: 23px; font-weight: 400; }
details[open] summary::after { content: '−'; }
details p { margin: -5px 35px 20px 0; color: var(--muted-dark); font-size: 12px; }

.final-cta { position: relative; padding: 135px 0; overflow: hidden; text-align: center; background: linear-gradient(135deg, #07111b, #0a1723 55%, #08121c); }
.final-cta::before, .final-cta::after { position: absolute; width: 330px; height: 330px; border: 1px solid rgba(74,163,233,.14); border-radius: 50%; content: ''; }
.final-cta::before { top: -170px; left: -110px; box-shadow: 0 0 0 25px rgba(74,163,233,.04), 0 0 0 55px rgba(74,163,233,.025); }
.final-cta::after { right: -150px; bottom: -210px; }
.final-inner { position: relative; z-index: 1; max-width: 820px; }
.final-inner .eyebrow { justify-content: center; }
.final-inner > p:not(.eyebrow) { max-width: 650px; margin: 0 auto; color: #b6c4ce; font-size: 16px; }
.final-price { margin: 29px 0 20px; color: var(--white); font: 700 73px/1 "Barlow Condensed", sans-serif; }
.final-inner small { display: block; margin-top: 17px; color: #81919e; font-size: 10px; }

.site-footer { padding: 50px 0; color: #a8b4bf; background: #03070b; }
.footer-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 45px; align-items: start; }
.footer-mark { color: #fff; }
.footer-grid p { max-width: 330px; margin: 18px 0 0; font-size: 11px; }
.footer-links { display: grid; gap: 10px; font-size: 11px; }
.footer-note { justify-self: end; max-width: 275px; color: #748391; font-size: 10px; line-height: 1.45; text-align: right; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay { transition-delay: .12s; }

@media (max-width: 900px) {
  .main-nav { display: none; }
  .hero-grid, .product-grid, .offer-grid, .faq-grid, .value-grid, .vehicle-grid { grid-template-columns: 1fr; gap: 55px; }
  .hero { min-height: 900px; }
  .hero-grid { min-height: 900px; padding-top: 56px; align-content: start; }
  .hero-side { min-height: 170px; }
  .spec-top { top: 10px; left: 0; right: auto; }
  .spec-bottom { right: 0; bottom: 5px; }
  .two-col { gap: 45px; }
  .module-grid { grid-template-columns: repeat(3, 1fr); }
  .compat-grid { grid-template-columns: repeat(3, 1fr); }
  .compat-card:last-child { grid-column: 2; }
  .timeline { grid-template-columns: repeat(3, 1fr); gap: 28px 0; }
  .timeline::before { top: 25px; right: 11%; left: 11%; }
  .timeline-item:nth-child(n+4) b { background: var(--red-dark); }
  .faq-grid { gap: 35px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-note { justify-self: start; text-align: left; }
}

@media (max-width: 620px) {
  .container { width: min(100% - 32px, 520px); }
  .top-strip { justify-content: center; padding: 7px 16px; font-size: 8px; text-align: center; }
  .top-strip span:last-child { display: none; }
  .site-header { padding: 13px 16px; }
  .wordmark strong { font-size: 11px; }
  .header-price { padding: 8px 11px; font-size: 11px; }
  .hero-bg { background-position: 68% center; }
  .hero-grid { padding-top: 44px; }
  h1 { font-size: clamp(70px, 19vw, 105px); }
  h2 { font-size: clamp(49px, 15vw, 72px); }
  .hero-lead { font-size: 20px; }
  .hero-body { font-size: 14px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-meta { display: grid; gap: 7px; }
  .hero { min-height: 875px; }
  .hero-grid { min-height: 875px; }
  .hero-side { min-height: 160px; }
  .floating-spec { min-width: 170px; padding: 10px 12px; }
  .engine-section, .problem-section, .product-section, .modules-section, .motors-section, .compat-section, .vehicle-section, .symptoms-section, .maintenance-section, .value-section, .offer-section, .faq-section, .final-cta { padding: 85px 0; }
  .engine-tabs { overflow-x: auto; }
  .engine-tab { min-width: 115px; padding: 15px 13px; font-size: 20px; }
  .engine-display { grid-template-columns: 1fr; }
  .engine-info { padding: 14px 22px 30px; border-top: 1px solid var(--line); border-left: 0; }
  .engine-info h3 { font-size: 72px; }
  .two-col { grid-template-columns: 1fr; }
  .solution-line { margin-top: 44px; }
  .book-stage { min-height: 450px; }
  .book-cover { width: 230px; }
  .book-cover h3 { font-size: 49px; }
  .stage-tag { right: 4px; bottom: 70px; font-size: 9px; }
  .module-grid, .motor-cards, .symptom-grid { grid-template-columns: 1fr 1fr; }
  .module-card { min-height: 155px; padding: 16px; }
  .module-card h3 { font-size: 23px; }
  .module-card p { font-size: 11px; }
  .motor-image { height: 170px; }
  .motor-copy { padding: 16px; }
  .motor-copy h3 { font-size: 45px; }
  .motor-copy span { font-size: 11px; }
  .compat-grid { grid-template-columns: 1fr 1fr; }
  .compat-card:last-child { grid-column: 1 / -1; }
  .vehicle-visual { min-height: 390px; }
  .hotspot { font-size: 9px; }
  .timeline { grid-template-columns: 1fr 1fr; }
  .timeline::before { display: none; }
  .timeline-item { flex-direction: row; gap: 10px; padding: 3px; text-align: left; }
  .timeline-item b { flex: 0 0 44px; width: 44px; height: 44px; border-width: 5px; }
  .timeline-item span { max-width: none; }
  .offer-bullets { grid-template-columns: 1fr; }
  .price-card { padding: 25px 20px; }
  .price strong { font-size: 68px; }
  .price-card .button { font-size: 11px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-note { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}