@import url("./tokens.css");

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

html { scroll-behavior: smooth; background: var(--color-surface); }
body { margin: 0; overflow-x: clip; background: var(--color-surface); color: var(--color-ink); font-family: var(--font-body); font-size: var(--font-size-body); line-height: 1.65; }
body.menu-open { overflow: hidden; }
img { display: block; width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 530; line-height: .97; letter-spacing: -.04em; text-wrap: balance; }
h1 { font-size: var(--font-size-heading-xl); }
h2 { font-size: var(--font-size-heading-lg); }
h3 { font-size: var(--font-size-heading-md); }
::selection { background: var(--color-ember); color: var(--color-pine); }
:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.skip-link { position: fixed; z-index: 1000; top: 1rem; left: 1rem; transform: translateY(-150%); padding: .7rem 1rem; background: var(--color-ember); color: var(--color-pine); }
.skip-link:focus { transform: none; }
.section-pad { padding: var(--section-space) var(--gutter); }
.kicker { margin-bottom: 1.25rem; font-size: .68rem; font-weight: 750; letter-spacing: .13em; text-transform: uppercase; }
.split-heading { display: grid; grid-template-columns: minmax(8rem, .65fr) minmax(18rem, 1.6fr) minmax(15rem, .75fr); gap: clamp(1.5rem, 4vw, 5rem); align-items: start; margin-bottom: clamp(4rem, 8vw, 8rem); }
.split-heading h2 { margin: 0; }
.split-heading > p:last-child { max-width: 30rem; color: var(--color-muted); }

.site-header { position: relative; z-index: 50; height: var(--header-height); padding: 0 var(--gutter); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--color-line); background: color-mix(in srgb, var(--color-surface) 92%, transparent); backdrop-filter: blur(14px); }
.brand { display: flex; align-items: center; gap: .65rem; font-family: var(--font-display); font-size: 1.05rem; letter-spacing: -.02em; }
.brand b { font-weight: 650; }
.brand-mark { width: 1.8rem; height: 1.8rem; border: 1px solid currentColor; border-radius: 50%; display: grid; place-items: center; }
.brand-mark i { width: .7rem; height: .7rem; border-radius: 50%; background: var(--color-ember); }
.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2vw, 2.2rem); font-size: .78rem; font-weight: 650; }
.site-nav > a:not(.button) { position: relative; padding: .7rem 0; }
.site-nav > a:not(.button)::after { content: ""; position: absolute; left: 0; bottom: .45rem; width: 100%; height: 1px; background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform .3s var(--ease-out); }
.site-nav > a:hover::after, .site-nav > a[aria-current="page"]::after { transform: scaleX(1); transform-origin: left; }
.menu-toggle { display: none; border: 0; background: none; color: inherit; }
.button { min-height: 3.1rem; padding: .8rem 1.35rem; display: inline-flex; align-items: center; justify-content: center; border: 1px solid currentColor; border-radius: var(--radius-control); font-size: .78rem; font-weight: 750; letter-spacing: .02em; white-space: nowrap; cursor: pointer; transition: transform .25s var(--ease-out), background .25s, color .25s; }
.button:hover { transform: translateY(-2px); background: var(--color-ink); color: var(--color-surface); }
.button:active { transform: translateY(0) scale(.98); }
.button-small { min-height: 2.65rem; padding: .55rem 1rem; }
.button-brasa { border-color: var(--color-ember); background: var(--color-ember); color: var(--color-pine); }
.button-brasa:hover { background: var(--color-ember-hover); color: var(--color-pine); }
.text-link { display: inline-flex; gap: .55rem; align-items: center; border-bottom: 1px solid currentColor; padding-bottom: .2rem; font-size: .83rem; font-weight: 750; }
.text-link span { transition: transform .25s var(--ease-out); }
.text-link:hover span { transform: translate(3px, -3px); }
.text-link.light { color: #f7faf8; }

.home-hero { min-height: calc(100dvh - var(--header-height)); position: relative; display: grid; align-items: end; padding: clamp(5rem, 10vh, 8rem) var(--gutter) 2rem; overflow: hidden; background: var(--color-pine); color: #f7faf8; }
.hero-media, .hero-shade { position: absolute; inset: 0; }
.hero-media img { width: 100%; height: 115%; object-fit: cover; object-position: center 54%; }
.hero-shade { background: linear-gradient(90deg, rgb(7 15 14 / 82%) 0%, rgb(7 15 14 / 30%) 52%, rgb(7 15 14 / 18%)), linear-gradient(0deg, rgb(7 15 14 / 75%), transparent 45%); }
.hero-ring { position: absolute; width: min(58vw, 46rem); aspect-ratio: 1; right: 6vw; top: 50%; transform: translateY(-53%); border: 1px solid rgb(255 255 255 / 40%); border-radius: 50%; }
.hero-ring::before, .hero-ring i { content: ""; position: absolute; inset: 8%; border: 1px solid rgb(255 255 255 / 22%); border-radius: 50%; }
.hero-ring i { inset: 23%; background: rgb(223 135 67 / 9%); }
.hero-copy { position: relative; z-index: 2; max-width: 75rem; }
.hero-copy h1 { max-width: 10ch; margin-bottom: 1.6rem; }
.hero-copy > p:not(.kicker) { max-width: 39rem; font-size: clamp(1rem, 1.5vw, 1.35rem); }
.button-row { display: flex; align-items: center; gap: 1.6rem; flex-wrap: wrap; margin-top: 2rem; }
.hero-facts { position: relative; z-index: 2; justify-self: end; display: flex; gap: 2rem; font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; }

.context-list { border-top: 1px solid var(--color-line); }
.context-row { min-height: 8rem; display: grid; grid-template-columns: .35fr 1.25fr 1fr auto; gap: 2rem; align-items: center; border-bottom: 1px solid var(--color-line); transition: padding .3s var(--ease-out), background .3s; }
.context-row:hover { padding-inline: 1rem; background: color-mix(in srgb, var(--color-mist) 18%, transparent); }
.context-row h3, .context-row p { margin: 0; }
.context-row p { color: var(--color-muted); }
.context-number { font-size: .7rem; }
.arrow { font-size: 1.3rem; }

.models-shell { height: 100dvh; display: flex; overflow: hidden; background: var(--color-pine); color: #f7faf8; }
.models-sticky-head { flex: 0 0 min(36vw, 34rem); padding: clamp(6rem, 10vh, 9rem) var(--gutter); display: flex; flex-direction: column; justify-content: center; border-right: 1px solid rgb(255 255 255 / 15%); }
.models-sticky-head h2 { margin: 0 0 2rem; }
.models-sticky-head > p:last-child { max-width: 24rem; color: var(--color-mist); }
.models-rail { display: flex; align-items: stretch; flex: 0 0 auto; width: max-content; will-change: transform; }
.model-card { width: min(54vw, 52rem); position: relative; flex: 0 0 auto; overflow: hidden; }
.model-card img { height: 100%; object-fit: cover; filter: saturate(.82); transition: transform .8s var(--ease-out); }
.model-card:hover img { transform: scale(1.025); }
.model-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgb(7 15 14 / 93%), transparent 65%); }
.model-overlay { position: absolute; z-index: 2; inset: auto clamp(2rem, 4vw, 4rem) clamp(2rem, 6vh, 4rem); }
.model-overlay > span { font-size: .7rem; }
.model-overlay h3 { margin: .5rem 0 1rem; font-size: clamp(3rem, 6vw, 6rem); }
.model-overlay > p { max-width: 34rem; }
.model-overlay dl { display: flex; gap: 3rem; margin: 1.5rem 0; }
.model-overlay dl div { display: grid; }
.model-overlay dt { font-size: .65rem; text-transform: uppercase; letter-spacing: .1em; color: var(--color-mist); }
.model-overlay dd { margin: 0; }
.rail-end { width: min(45vw, 42rem); padding: var(--gutter); display: flex; flex: 0 0 auto; flex-direction: column; align-items: flex-start; justify-content: center; }
.rail-end h3 { font-size: clamp(3rem, 5vw, 5rem); }

.process-section { background: var(--color-mineral); color: var(--color-graphite); }
.process-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid rgb(20 32 30 / 25%); }
.process-list li { min-height: 16rem; padding: 2rem 1.5rem 1rem 0; border-right: 1px solid rgb(20 32 30 / 18%); }
.process-list span { font-size: .68rem; }
.process-list h3 { margin: 4rem 0 .8rem; font-size: 1.8rem; }
.process-list p { color: #5d6a67; font-size: .9rem; }
.heat-section { min-height: 90dvh; position: relative; overflow: hidden; padding: var(--section-space) var(--gutter); display: flex; justify-content: flex-end; align-items: center; background: var(--color-ember); color: var(--color-pine); }
.heat-word { position: absolute; left: -.04em; bottom: -.27em; font-family: var(--font-display); font-size: clamp(13rem, 37vw, 40rem); font-weight: 600; letter-spacing: -.1em; line-height: 1; opacity: .1; }
.heat-copy { position: relative; width: min(47rem, 58%); }
.heat-copy h2 { margin-bottom: 3rem; }
.heat-options { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; margin-bottom: 2.5rem; border-top: 1px solid rgb(16 23 22 / 30%); padding-top: 1.5rem; }
.showroom-section { display: grid; grid-template-columns: 1.25fr .75fr; gap: clamp(2rem, 7vw, 8rem); align-items: center; }
.showroom-image, .product-image, .case-image { border-radius: var(--radius-media); overflow: hidden; }
.showroom-image img { aspect-ratio: 4 / 3; object-fit: cover; }
.showroom-copy h2 { font-size: clamp(2.7rem, 4.6vw, 5rem); }
.showroom-copy p:not(.kicker) { margin-bottom: 2rem; color: var(--color-muted); }
.faq-section { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(3rem, 10vw, 10rem); }
.faq-list { border-top: 1px solid var(--color-line); }
.faq-list details { border-bottom: 1px solid var(--color-line); }
.faq-list summary { min-height: 5.5rem; display: grid; grid-template-columns: 3rem 1fr auto; align-items: center; cursor: pointer; list-style: none; font-family: var(--font-display); font-size: clamp(1.1rem, 1.7vw, 1.55rem); }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { font: 700 .65rem var(--font-body); }
.faq-list summary i { font-style: normal; transition: transform .25s; }
.faq-list details[open] summary i { transform: rotate(45deg); }
.faq-list details p { max-width: 45rem; margin: 0 3rem 2rem; color: var(--color-muted); }
.final-cta { min-height: 80dvh; position: relative; overflow: hidden; padding: var(--section-space) var(--gutter); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; background: var(--color-well); color: #f7faf8; }
.final-cta h2 { max-width: 12ch; }
.final-cta > p:not(.kicker) { max-width: 36rem; margin-bottom: 2rem; color: var(--color-mist); }
.orbit { position: absolute; width: min(65vw, 50rem); aspect-ratio: 1; border: 1px solid rgb(255 255 255 / 14%); border-radius: 50%; }
.orbit i { position: absolute; inset: 18%; border: 1px solid rgb(255 255 255 / 10%); border-radius: 50%; }
.final-cta > *:not(.orbit) { position: relative; }

.site-footer { padding: var(--section-space) var(--gutter) 2rem; background: var(--color-pine); color: #f7faf8; }
.footer-lead { padding-bottom: 7rem; }
.footer-lead h2 { margin-bottom: 2rem; }
.footer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4rem; padding: 3rem 0; border-top: 1px solid rgb(255 255 255 / 18%); }
.footer-grid > div { display: flex; flex-direction: column; gap: .45rem; color: var(--color-mist); font-size: .82rem; }
.footer-label { color: #f7faf8; font-size: .65rem; text-transform: uppercase; letter-spacing: .12em; }
.footer-base { display: flex; justify-content: space-between; gap: 2rem; padding-top: 1.5rem; border-top: 1px solid rgb(255 255 255 / 18%); color: var(--color-mist); font-size: .68rem; }
.concept-notice { max-width: 72ch; margin: 3rem auto 0; color: var(--color-mist); font-size: .72rem; text-align: center; }

.page-hero { min-height: 68dvh; padding: clamp(7rem, 13vw, 12rem) var(--gutter) 4rem; display: grid; grid-template-columns: .3fr 1.5fr .65fr; gap: clamp(2rem, 5vw, 6rem); align-items: end; }
.page-hero-dark { background: var(--color-pine); color: #f7faf8; }
.page-hero-index { align-self: start; font-size: .7rem; }
.page-hero h1 { max-width: 11ch; margin: 0; font-size: clamp(4rem, 8vw, 8.5rem); }
.page-hero-intro { color: var(--color-muted); }
.page-hero-dark .page-hero-intro { color: var(--color-mist); }
.comparison-table { border-top: 1px solid var(--color-line); }
.comparison-row { min-height: 6rem; padding: 1rem 0; display: grid; grid-template-columns: .8fr 1fr 1.3fr 1fr; gap: 2rem; align-items: center; border-bottom: 1px solid var(--color-line); }
.comparison-row:not(.comparison-head):hover { color: var(--color-ember); }
.comparison-head { min-height: 3rem; color: var(--color-muted); font-size: .65rem; text-transform: uppercase; letter-spacing: .1em; }
.comparison-row strong { font: 550 clamp(1.8rem, 3vw, 3rem) var(--font-display); }
.product-stories { padding: 0 var(--gutter) var(--section-space); }
.product-story { min-height: 75dvh; display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: clamp(3rem, 8vw, 9rem); padding: clamp(4rem, 7vw, 7rem) 0; border-top: 1px solid var(--color-line); }
.product-image img { aspect-ratio: 4 / 5; object-fit: cover; }
.product-copy { position: relative; }
.product-index { position: absolute; right: 0; top: 0; font-size: .7rem; }
.product-copy h2 { font-size: clamp(2.5rem, 4vw, 4.7rem); }
.product-copy > p:not(.kicker) { color: var(--color-muted); }
.product-copy dl { margin-top: 3rem; border-top: 1px solid var(--color-line); }
.product-copy dl div, .showroom-panel dl div { display: flex; justify-content: space-between; gap: 2rem; padding: 1rem 0; border-bottom: 1px solid var(--color-line); }
.product-copy dd, .showroom-panel dd { margin: 0; text-align: right; color: var(--color-muted); }
.product-copy dt, .showroom-panel dt { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; }
.materials { display: grid; grid-template-columns: 1fr 1fr; gap: 8vw; background: var(--color-mineral); color: var(--color-graphite); }
.material-notes p { display: grid; grid-template-columns: 3rem 1fr; padding: 1.5rem 0; border-top: 1px solid rgb(20 32 30 / 20%); }
.material-notes span { font-size: .65rem; }
.case-list { padding-top: 1rem; }
.case-study { min-height: 80dvh; display: grid; grid-template-columns: 1.25fr .75fr; gap: clamp(3rem, 8vw, 10rem); align-items: center; padding: var(--section-space) 0; border-bottom: 1px solid var(--color-line); }
.case-study.reverse { grid-template-columns: .75fr 1.25fr; }
.case-study.reverse .case-image { order: 2; }
.case-image img { aspect-ratio: 5 / 4; object-fit: cover; }
.case-count { font-size: .68rem; }
.case-copy h2 { margin: 1rem 0 2rem; }
.case-copy > p:not(.kicker) { color: var(--color-muted); }
.concept-tag { display: inline-block; margin-top: 2rem; padding: .45rem .7rem; border: 1px solid var(--color-line); border-radius: var(--radius-control); font-size: .66rem; text-transform: uppercase; letter-spacing: .09em; }
.project-check { background: var(--color-pine); color: #f7faf8; }
.project-check h2 { max-width: 12ch; }
.word-cloud { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 4rem; }
.word-cloud span { padding: .75rem 1.1rem; border: 1px solid rgb(255 255 255 / 25%); border-radius: var(--radius-control); font: 500 clamp(1rem, 2vw, 1.5rem) var(--font-display); }
.chapter-nav { display: grid; grid-template-columns: repeat(5, 1fr); padding-top: 3rem; padding-bottom: 3rem; border-bottom: 1px solid var(--color-line); }
.chapter-nav a { padding: 1rem; border-right: 1px solid var(--color-line); font-size: .78rem; }
.chapter-nav span { display: block; margin-bottom: 1.5rem; color: var(--color-muted); font-size: .65rem; }
.guide-body { max-width: 100rem; margin: auto; }
.guide-chapter { scroll-margin-top: 2rem; display: grid; grid-template-columns: .4fr 1.3fr; gap: 4rem; padding: clamp(5rem, 9vw, 9rem) 0; border-bottom: 1px solid var(--color-line); }
.chapter-number { font: 500 clamp(4rem, 10vw, 10rem) var(--font-display); color: color-mix(in srgb, var(--color-ink) 15%, transparent); line-height: .8; }
.guide-chapter h2 { font-size: clamp(3rem, 6vw, 6rem); }
.guide-chapter p { max-width: 49rem; color: var(--color-muted); font-size: clamp(1.05rem, 1.5vw, 1.3rem); }
.heat-compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 3rem; }
.heat-compare p { padding: 1.5rem; border: 1px solid var(--color-line); border-radius: .75rem; }
.guide-note { max-width: 48rem; margin: var(--section-space) 0 0 auto; padding: 3rem; border-radius: var(--radius-media); background: var(--color-ember); color: var(--color-pine); }
.guide-note p:last-child { font: 500 clamp(1.5rem, 3vw, 2.6rem) / 1.2 var(--font-display); }
.checklist { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; }
.checklist li { padding: 1.5rem .5rem; border-bottom: 1px solid var(--color-line); }
.checklist li::before { content: "✓"; margin-right: 1rem; color: var(--color-ember); }
.contact-layout { display: grid; grid-template-columns: 1.35fr .65fr; gap: clamp(3rem, 8vw, 10rem); }
.project-form { display: grid; gap: 2rem; }
.form-intro h2 { margin-bottom: 1rem; }
.form-intro p:last-child { color: var(--color-muted); }
.project-form > label { display: grid; gap: .6rem; }
.project-form label > span, .project-form legend { font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; }
.project-form input, .project-form textarea { width: 100%; padding: 1rem 0; border: 0; border-bottom: 1px solid var(--color-line); border-radius: 0; outline: none; background: transparent; color: var(--color-ink); }
.project-form input:focus, .project-form textarea:focus { border-color: var(--color-ember); box-shadow: 0 2px 0 var(--color-ember); }
.project-form fieldset { margin: 0; padding: 0; border: 0; }
.choice-row { display: flex; flex-wrap: wrap; gap: .7rem; margin-top: .8rem; }
.choice-row input { position: absolute; width: 1px; height: 1px; overflow: hidden; opacity: 0; pointer-events: none; }
.choice-row label span { display: block; padding: .7rem 1rem; border: 1px solid var(--color-line); border-radius: var(--radius-control); cursor: pointer; }
.choice-row input:focus-visible + span { box-shadow: var(--focus-ring); }
.choice-row input:checked + span { background: var(--color-ink); color: var(--color-surface); }
.project-form .button { justify-self: start; }
.project-form button:disabled { opacity: .65; cursor: wait; }
.form-status { min-height: 1.5rem; color: var(--color-muted); }
.contact-aside { display: flex; flex-direction: column; gap: 4rem; padding-top: 8rem; }
.contact-aside ul { padding-left: 1.2rem; color: var(--color-muted); }
.contact-aside > div:last-child p:last-child { color: var(--color-muted); }
.showroom-detail { position: relative; min-height: 95dvh; display: flex; align-items: flex-end; padding: var(--gutter); }
.showroom-detail > img { position: absolute; inset: 0; height: 100%; object-fit: cover; }
.showroom-panel { position: relative; width: min(42rem, 90%); margin-left: auto; padding: clamp(2rem, 5vw, 5rem); border-radius: var(--radius-media); background: var(--color-surface); }
.showroom-panel h2 { font-size: clamp(2.7rem, 4.5vw, 4.8rem); }
.showroom-panel small { display: block; margin-top: 1rem; color: var(--color-muted); }

@media (max-width: 899px) {
  :root { --header-height: 4rem; }
  .site-header { position: sticky; top: 0; }
  .menu-toggle { display: flex; width: 3rem; height: 3rem; align-items: center; justify-content: center; flex-direction: column; gap: .35rem; cursor: pointer; }
  .menu-toggle span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .menu-toggle i { width: 1.4rem; height: 1px; background: currentColor; transition: transform .25s; }
  .menu-toggle[aria-expanded="true"] i:first-of-type { transform: translateY(3px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] i:last-of-type { transform: translateY(-3px) rotate(-45deg); }
  .site-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; max-height: calc(100dvh - var(--header-height)); overflow-y: auto; padding: 1.5rem var(--gutter) 2rem; background: var(--color-surface); border-bottom: 1px solid var(--color-line); flex-direction: column; align-items: stretch; gap: .6rem; }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: .65rem 0; }
  .split-heading, .page-hero { grid-template-columns: 1fr; }
  .split-heading { gap: 1rem; }
  .split-heading .kicker { margin-bottom: 2rem; }
  .page-hero { min-height: 70dvh; align-content: end; }
  .page-hero-index { display: none; }
  .home-hero { min-height: calc(100dvh - var(--header-height)); padding-bottom: 1.25rem; }
  .hero-copy h1 { font-size: clamp(3.3rem, 14vw, 5.5rem); }
  .hero-ring { width: 90vw; right: -24vw; }
  .hero-facts { width: 100%; justify-self: auto; justify-content: space-between; gap: 1rem; font-size: .57rem; }
  .context-row { grid-template-columns: 2.5rem 1fr auto; gap: 1rem; padding: 1.4rem 0; }
  .context-row p { grid-column: 2 / 4; }
  .models-shell { height: auto; display: block; padding: var(--section-space) 0; }
  .models-sticky-head { padding: 0 var(--gutter) 3rem; border: 0; }
  .models-rail { width: 100%; overflow-x: auto; overscroll-behavior-inline: contain; scroll-snap-type: x mandatory; scrollbar-width: thin; padding: 0 var(--gutter) 1rem; gap: 1rem; will-change: auto; }
  .model-card { flex: 0 0 84vw; height: 72dvh; border-radius: var(--radius-media); scroll-snap-align: center; }
  .rail-end { flex: 0 0 82vw; min-height: 72dvh; scroll-snap-align: end; }
  .model-overlay dl { gap: 1rem; flex-direction: column; }
  .process-list { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; }
  .process-list li { flex: 0 0 65vw; scroll-snap-align: start; }
  .heat-section { min-height: 75dvh; justify-content: flex-start; }
  .heat-copy { width: 100%; }
  .heat-options { grid-template-columns: 1fr; gap: .5rem; }
  .showroom-section, .faq-section { grid-template-columns: 1fr; }
  .faq-list details p { margin-left: 3rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-base { flex-direction: column; }
  .comparison-row { grid-template-columns: 1fr 1fr; gap: .5rem 1rem; padding: 1.4rem 0; }
  .comparison-head { display: none; }
  .product-story, .case-study, .case-study.reverse { grid-template-columns: 1fr; }
  .case-study.reverse .case-image { order: 0; }
  .materials { grid-template-columns: 1fr; }
  .chapter-nav { display: flex; overflow-x: auto; }
  .chapter-nav a { flex: 0 0 10rem; }
  .guide-chapter { grid-template-columns: 1fr; gap: 2rem; }
  .chapter-number { font-size: 5rem; }
  .faq-section .checklist { grid-template-columns: 1fr; }
  .contact-layout { grid-template-columns: 1fr; }
  .contact-aside { padding-top: 2rem; }
  .showroom-detail { min-height: 110dvh; }
  .showroom-panel { width: 100%; }
  .choice-row { flex-direction: column; }
  .choice-row label span { text-align: center; }
}

@media (max-width: 520px) {
  h1 { font-size: clamp(3rem, 14vw, 4.5rem); }
  h2 { font-size: clamp(2.5rem, 12vw, 4rem); }
  .hero-facts { display: none; }
  .model-card { flex-basis: calc(100vw - 2.5rem); }
  .model-overlay { inset-inline: 1.25rem; bottom: 1.25rem; }
  .model-overlay h3 { font-size: 3rem; }
  .rail-end { flex-basis: calc(100vw - 2.5rem); }
  .heat-compare { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  .process-section, .materials { background: #dfe7e2; }
  .showroom-panel { background: #101917; }
  .guide-note { color: var(--color-pine); }
}