:root {
  --porcelain: #f6f5f1;
  --porcelain-deep: #e8e7e1;
  --wine: #75192d;
  --wine-dark: #48101f;
  --rock: #53616c;
  --rock-dark: #2d3740;
  --silver: #aeb5ba;
  --ink: #16191c;
  --white: #fff;
  --line: rgba(22, 25, 28, .16);
  --light-line: rgba(255, 255, 255, .2);
  --radius: 20px;
  --sans: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --display: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--porcelain);
  font-family: var(--sans);
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}

::selection { color: var(--white); background: var(--wine); }

h1, h2, h3, p, figure, dl, dd { margin-top: 0; }
img { display: block; max-width: 100%; }

.page-shell {
  width: min(1460px, calc(100% - 72px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  left: 18px;
  top: -70px;
  z-index: 100;
  padding: 10px 15px;
  color: var(--white);
  background: var(--wine);
  text-decoration: none;
}

.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(246, 245, 241, .95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.header-inner {
  min-height: 90px;
  display: grid;
  grid-template-columns: minmax(220px, .7fr) minmax(0, 1.3fr);
  align-items: center;
  gap: 44px;
}

.brand-lockup {
  width: max-content;
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-logo { width: 48px; height: 48px; object-fit: contain; }
.brand-lockup strong { display: block; font-family: var(--display); font-size: 23px; letter-spacing: .08em; }
.brand-lockup span { display: block; margin-top: -2px; color: var(--rock); font-size: 9px; font-weight: 780; letter-spacing: .2em; }

.site-nav { display: flex; justify-content: flex-end; gap: clamp(14px, 1.7vw, 27px); }

.site-nav a {
  position: relative;
  padding: 30px 0 26px;
  color: var(--rock-dark);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  right: 50%;
  bottom: 19px;
  height: 2px;
  background: var(--wine);
  transition: left .2s ease, right .2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] { color: var(--wine); }

.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a[aria-current="page"]::after { left: 0; right: 0; }
.site-nav a:focus-visible { outline: 2px solid var(--wine); outline-offset: 7px; }

.nav-toggle {
  display: none;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.showroom-hero { padding: 44px 0 70px; }

.hero-stage {
  min-height: 760px;
  display: grid;
  grid-template-columns: 84px minmax(0, 1.08fr) minmax(390px, .92fr);
  grid-template-rows: 1fr auto;
  gap: 34px;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  background: var(--white);
}

.brand-index {
  grid-row: 1 / 3;
  padding-right: 20px;
  display: flex;
  align-items: center;
  flex-direction: column;
  border-right: 1px solid var(--line);
}

.brand-index > span { color: var(--wine); font-size: 13px; font-weight: 900; letter-spacing: .18em; }
.brand-index strong { margin-top: 52px; color: var(--rock); font-size: 12px; letter-spacing: .14em; writing-mode: vertical-rl; }
.brand-index small { margin-top: auto; color: var(--silver); font-size: 8px; font-weight: 800; letter-spacing: .18em; writing-mode: vertical-rl; }

.hero-heading { align-self: center; padding: 26px 30px 26px 16px; }

.overline,
.section-code {
  color: var(--wine);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: .2em;
  text-transform: uppercase;
}

.overline { margin-bottom: 24px; }

.showroom-hero h1 {
  max-width: 900px;
  margin-bottom: 28px;
  font-family: var(--display);
  font-size: clamp(54px, 6.5vw, 102px);
  font-weight: 600;
  letter-spacing: -.05em;
  line-height: 1.01;
}

.hero-slogan { max-width: 730px; margin-bottom: 16px; color: var(--wine); font-family: var(--display); font-size: clamp(20px, 2vw, 29px); }
.hero-copy { max-width: 700px; margin-bottom: 0; color: var(--rock); font-size: 15px; }

.media-slot { position: relative; margin: 0; overflow: hidden; background: var(--rock); }
.media-slot img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.hero-window { min-height: 560px; border-radius: var(--radius); }
.hero-window::after { content: "DISPLAY WINDOW / 01"; position: absolute; right: 14px; bottom: 14px; padding: 8px 10px; color: var(--white); background: rgba(22,25,28,.76); font-size: 8px; font-weight: 800; letter-spacing: .16em; }

.hero-track {
  grid-column: 2 / 4;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}

.hero-track > div { min-height: 92px; padding: 18px 20px 12px; display: grid; grid-template-columns: 30px 1fr; gap: 3px 12px; border-right: 1px solid var(--line); }
.hero-track > div:last-child { border-right: 0; }
.hero-track span { grid-row: 1 / 3; color: var(--wine); font-size: 10px; font-weight: 850; }
.hero-track strong { font-family: var(--display); font-size: 17px; }
.hero-track small { color: var(--rock); font-size: 10px; }

.section-head { margin-bottom: 64px; }
.section-head h2,
.catalogue-copy h3,
.updates-copy h2,
.manual-heading h2,
.app-copy h2,
.device-intro h2,
.faq-title-block h2,
.brand-card h2 {
  margin-bottom: 18px;
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -.04em;
  line-height: 1.08;
}

.section-head h2,
.updates-copy h2,
.manual-heading h2,
.app-copy h2,
.brand-card h2 { font-size: clamp(42px, 5.5vw, 78px); }

.section-head > p:last-child,
.updates-copy > p,
.manual-heading > p,
.app-copy > p,
.brand-card > p { max-width: 790px; color: var(--rock); font-size: 16px; }

.section-head-centered { max-width: 930px; margin-inline: auto; text-align: center; }
.section-head-centered > p:last-child { margin-inline: auto; }

.information-index { padding: 122px 0; background: var(--porcelain); }

.index-rail { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--white); }
.index-rail article { min-height: 290px; padding: 28px; border-right: 1px solid var(--line); }
.index-rail article:last-child { border-right: 0; }
.rail-no { color: var(--wine); font: 600 18px/1 var(--display); }
.index-rail h3 { margin: 64px 0 13px; font-family: var(--display); font-size: 25px; line-height: 1.2; }
.index-rail p { margin-bottom: 0; color: var(--rock); font-size: 13px; }

.catalogue-showcase { margin-top: 74px; display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(370px, .88fr); gap: 64px; align-items: center; }
.catalogue-image { min-height: 630px; border-radius: var(--radius); }
.catalogue-copy { padding: 30px 0; }
.catalogue-copy h3 { margin-top: 18px; font-size: clamp(38px, 4.7vw, 66px); }
.catalogue-copy > p { color: var(--rock); }
.catalogue-fields { margin: 34px 0 0; border-top: 1px solid var(--line); }
.catalogue-fields div { padding: 12px 0; display: grid; grid-template-columns: 125px 1fr; gap: 20px; border-bottom: 1px solid var(--line); }
.catalogue-fields dt { font-weight: 740; }
.catalogue-fields dd { color: var(--rock); }

.topic-gallery { padding: 124px 0; color: var(--white); background: var(--rock-dark); }
.topic-heading { display: grid; grid-template-columns: 170px minmax(0, 1fr); gap: 60px; }
.topic-heading .section-code { color: #cfd7dc; }
.topic-heading > p:last-child { color: #bdc4c9; }
.topic-rooms { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.topic-room { display: grid; grid-template-columns: minmax(260px, .9fr) minmax(0, 1.1fr); min-height: 500px; overflow: hidden; border: 1px solid var(--light-line); border-radius: var(--radius); }
.topic-room-offset { margin-top: 76px; }
.topic-image { min-height: 500px; }
.topic-copy { padding: 42px; display: flex; justify-content: flex-end; flex-direction: column; }
.topic-copy span { color: #cfd7dc; font-size: 10px; font-weight: 850; letter-spacing: .16em; }
.topic-copy h3 { margin: 22px 0 15px; font-family: var(--display); font-size: 32px; line-height: 1.2; }
.topic-copy p { margin-bottom: 0; color: #bdc4c9; }

.updates-window { padding: 122px 0; background: var(--white); }
.updates-layout { display: grid; grid-template-columns: minmax(360px, .82fr) minmax(0, 1.18fr); gap: 84px; align-items: stretch; }
.updates-image { min-height: 760px; border-radius: var(--radius); }
.updates-copy { padding: 30px 0; }
.update-register { margin-top: 46px; border-top: 1px solid var(--line); }
.update-register article { padding: 25px 0; display: grid; grid-template-columns: 110px minmax(0, 1fr) 150px; gap: 24px; align-items: start; border-bottom: 1px solid var(--line); }
.update-register span { color: var(--wine); font-size: 10px; font-weight: 850; letter-spacing: .1em; }
.update-register h3 { margin-bottom: 8px; font-family: var(--display); font-size: 25px; }
.update-register p { margin-bottom: 0; color: var(--rock); font-size: 13px; }
.update-register em { color: var(--rock); font-size: 11px; font-style: normal; text-align: right; }

.online-manual { padding: 122px 0; color: var(--white); background: var(--wine-dark); }
.manual-heading { max-width: 960px; }
.manual-heading .section-code { color: #e9bbc6; }
.manual-heading > p { color: #dfc3ca; }
.manual-steps { margin: 60px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); list-style: none; border-top: 1px solid var(--light-line); border-bottom: 1px solid var(--light-line); }
.manual-steps li { min-height: 330px; padding: 32px; display: flex; justify-content: space-between; flex-direction: column; border-right: 1px solid var(--light-line); }
.manual-steps li:last-child { border-right: 0; }
.manual-steps span { color: #e9bbc6; font-size: 10px; font-weight: 850; letter-spacing: .14em; }
.manual-steps h3 { margin-bottom: 14px; font-family: var(--display); font-size: 27px; line-height: 1.2; }
.manual-steps p { margin-bottom: 0; color: #d7bdc3; font-size: 14px; }

.app-service { padding: 122px 0; background: var(--porcelain-deep); }
.app-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, .78fr); gap: 70px; align-items: center; }
.app-copy { padding: 20px 0; }
.app-facts { margin: 38px 0 0; border-top: 1px solid var(--line); }
.app-facts div { padding: 12px 0; display: grid; grid-template-columns: 180px 1fr; gap: 20px; border-bottom: 1px solid var(--line); }
.app-facts dt { font-weight: 750; }
.app-facts dd { color: var(--rock); }
.app-image { min-height: 610px; border-radius: var(--radius); }

.device-manual { grid-column: 1 / 3; margin-top: 64px; padding-top: 70px; display: grid; grid-template-columns: minmax(310px, .7fr) minmax(0, 1.3fr); gap: 70px; border-top: 1px solid var(--line); }
.device-intro h2 { font-size: clamp(38px, 4.4vw, 62px); }
.device-intro > p:last-child { color: var(--rock); }
.device-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--white); }
.device-grid article { min-height: 290px; padding: 26px; border-right: 1px solid var(--line); }
.device-grid article:last-child { border-right: 0; }
.device-grid span { color: var(--wine); font-size: 10px; font-weight: 850; }
.device-grid h3 { margin: 46px 0 12px; font-family: var(--display); font-size: 22px; line-height: 1.25; }
.device-grid p { margin-bottom: 0; color: var(--rock); font-size: 13px; }

.faq { grid-column: 1 / 3; margin-top: 84px; padding-top: 70px; display: grid; grid-template-columns: minmax(280px, .62fr) minmax(0, 1.38fr); gap: 80px; border-top: 1px solid var(--line); }
.faq-title-block h2 { font-size: clamp(36px, 4vw, 58px); }
.faq-title-block > p:last-child { color: var(--rock); }
.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 22px 45px 22px 0; cursor: pointer; list-style: none; font-weight: 720; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 5px; top: 16px; color: var(--wine); font-size: 27px; font-weight: 400; }
details[open] summary::after { content: "−"; }
details p { padding: 0 42px 22px 0; color: var(--rock); }

.brand-disclosure { padding: 122px 0; color: var(--white); background: var(--rock-dark); }
.disclosure-layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(360px, .85fr); gap: 80px; align-items: stretch; }
.brand-card { padding: 55px; border: 1px solid var(--light-line); border-radius: var(--radius); }
.brand-card .section-code { color: #cfd7dc; }
.brand-card > p { color: #bdc4c9; }
.brand-card dl { margin: 38px 0 0; border-top: 1px solid var(--light-line); }
.brand-card dl div { padding: 12px 0; display: grid; grid-template-columns: 150px 1fr; gap: 24px; border-bottom: 1px solid var(--light-line); }
.brand-card dt { color: #dce2e6; font-weight: 740; }
.brand-card dd { color: #bdc4c9; }
.brand-image { min-height: 700px; border-radius: var(--radius); }

.site-footer { padding: 42px 0; color: #aeb5ba; background: var(--ink); font-size: 12px; }
.footer-layout { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 46px; align-items: end; }
.footer-layout strong { color: var(--white); font-family: var(--display); font-size: 22px; }
.footer-layout p { margin: 5px 0 0; }

@media (max-width: 1160px) {
  .page-shell { width: min(1460px, calc(100% - 46px)); }
  .header-inner { grid-template-columns: 200px minmax(0, 1fr); gap: 22px; }
  .site-nav { gap: 16px; overflow-x: auto; scrollbar-width: none; }
  .site-nav::-webkit-scrollbar { display: none; }
  .hero-stage { grid-template-columns: 64px minmax(0, 1fr) minmax(350px, .82fr); }
  .showroom-hero h1 { font-size: clamp(50px, 6.4vw, 78px); }
  .index-rail { grid-template-columns: repeat(2, 1fr); }
  .index-rail article { border-bottom: 1px solid var(--line); }
  .index-rail article:nth-child(2) { border-right: 0; }
  .index-rail article:nth-child(3), .index-rail article:nth-child(4) { border-bottom: 0; }
  .topic-room { grid-template-columns: 1fr; }
  .topic-image { min-height: 390px; }
  .updates-layout, .disclosure-layout { gap: 52px; }
  .device-manual { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 76px; }
  .page-shell { width: min(100% - 30px, 1460px); }
  .header-inner { min-height: 76px; display: flex; justify-content: space-between; }
  .brand-logo { width: 40px; height: 40px; }
  .brand-lockup strong { font-size: 20px; }
  .nav-toggle { display: inline-flex; align-items: center; gap: 10px; padding: 10px 0; }
  .nav-toggle-label { font-size: 13px; font-weight: 740; }
  .nav-toggle-lines { position: relative; width: 24px; height: 12px; border-top: 2px solid currentColor; border-bottom: 2px solid currentColor; }
  .js .site-nav { position: absolute; left: 0; right: 0; top: 76px; padding: 18px 15px 22px; display: none; grid-template-columns: repeat(2, 1fr); gap: 0; overflow: visible; background: var(--porcelain); border-bottom: 1px solid var(--line); }
  .js .site-nav[data-open="true"] { display: grid; }
  .site-nav a { padding: 12px 16px; border-bottom: 1px solid var(--line); }
  .site-nav a::after { display: none; }
  .showroom-hero { padding: 22px 0 48px; }
  .hero-stage { min-height: auto; grid-template-columns: 42px minmax(0, 1fr); grid-template-rows: auto auto auto; gap: 22px; padding: 22px; }
  .brand-index { grid-row: 1 / 4; padding-right: 12px; }
  .brand-index strong { margin-top: 34px; }
  .hero-heading { grid-column: 2; padding: 16px 0 8px; }
  .showroom-hero h1 { font-size: clamp(46px, 11vw, 72px); }
  .hero-window { grid-column: 2; min-height: 410px; }
  .hero-track { grid-column: 2; grid-template-columns: repeat(2, 1fr); }
  .hero-track > div:nth-child(2) { border-right: 0; }
  .hero-track > div:nth-child(1), .hero-track > div:nth-child(2) { border-bottom: 1px solid var(--line); }
  .catalogue-showcase, .updates-layout, .app-layout, .disclosure-layout { grid-template-columns: 1fr; }
  .catalogue-image { min-height: 500px; }
  .topic-heading { grid-template-columns: 1fr; gap: 18px; }
  .topic-rooms { grid-template-columns: 1fr; }
  .topic-room-offset { margin-top: 0; }
  .updates-image { min-height: 480px; }
  .update-register article { grid-template-columns: 90px 1fr; }
  .update-register em { grid-column: 2; text-align: left; }
  .manual-steps { grid-template-columns: 1fr; }
  .manual-steps li { min-height: 260px; border-right: 0; border-bottom: 1px solid var(--light-line); }
  .manual-steps li:last-child { border-bottom: 0; }
  .app-image { min-height: 470px; }
  .device-manual, .faq { grid-column: 1; }
  .faq { grid-template-columns: 1fr; gap: 34px; }
  .brand-image { min-height: 540px; }
  .footer-layout { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 560px) {
  .hero-stage { grid-template-columns: 30px minmax(0, 1fr); padding: 16px; }
  .brand-index small { display: none; }
  .showroom-hero h1 { font-size: clamp(42px, 12vw, 60px); }
  .hero-window { min-height: 300px; }
  .hero-track { grid-template-columns: 1fr; }
  .hero-track > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .hero-track > div:last-child { border-bottom: 0; }
  .information-index, .topic-gallery, .updates-window, .online-manual, .app-service, .brand-disclosure { padding: 78px 0; }
  .index-rail { grid-template-columns: 1fr; }
  .index-rail article, .index-rail article:nth-child(2), .index-rail article:nth-child(3) { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .index-rail article:last-child { border-bottom: 0; }
  .index-rail h3 { margin-top: 38px; }
  .catalogue-image { min-height: 330px; }
  .catalogue-fields div, .app-facts div, .brand-card dl div { grid-template-columns: 1fr; gap: 4px; }
  .topic-room { min-height: auto; }
  .topic-image { min-height: 320px; }
  .topic-copy { padding: 28px; }
  .updates-image { min-height: 340px; }
  .update-register article { grid-template-columns: 1fr; gap: 10px; }
  .update-register em { grid-column: 1; }
  .manual-steps li { padding: 26px; }
  .app-image { min-height: 330px; }
  .device-grid { grid-template-columns: 1fr; }
  .device-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .device-grid article:last-child { border-bottom: 0; }
  .device-grid h3 { margin-top: 32px; }
  .brand-card { padding: 30px 24px; }
  .brand-image { min-height: 360px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}