:root {
  --chassis: #12181c;
  --paper: #e7ebf0;
  --sheet: #f7f8fa;
  --ink: #1a242b;
  --metal: #5c6770;
  --line: #cfd6dc;
  --copper: #8d4e2f;
  --scope: #1d5f78;
  --on-dark: #e7edf1;
  --on-dark-dim: #a8b3bb;
  --header: 72px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.7;
}
main { flex: 1; }
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, textarea { font: inherit; }
h1, h2, h3, .model, .logo-word {
  font-family: "Noto Serif SC", "Songti SC", "Noto Serif", serif;
  font-weight: 600;
  letter-spacing: -0.02em;
}
::selection { background: #c9d7df; color: var(--ink); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--scope);
  outline-offset: 3px;
}

html.theme-dark { background: var(--chassis); color: var(--on-dark); }
html.theme-light { background: var(--paper); color: var(--ink); }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}
.skip {
  position: fixed;
  left: 16px;
  top: 12px;
  transform: translateY(-160%);
  background: var(--sheet);
  color: var(--ink);
  padding: 8px 12px;
  z-index: 40;
}
.skip:focus { transform: none; }

.wrap { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }
.page-intro { padding: 32px 0 8px; }

#site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: var(--header);
  background: rgba(18, 24, 28, 0.94);
  color: var(--on-dark);
  border-bottom: 1px solid rgba(231, 237, 241, 0.12);
}
.bar {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  min-height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--copper);
}
.logo svg { width: 28px; height: 28px; flex: none; }
.logo strong {
  display: block;
  color: var(--on-dark);
  font-family: "Noto Serif SC", serif;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0;
  line-height: 1.15;
}
.logo em {
  display: block;
  margin-top: 2px;
  font-style: normal;
  font-family: "Noto Sans SC", sans-serif;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--on-dark-dim);
}
.site-nav { display: flex; align-items: center; gap: 2px; }
.site-nav > a,
.has-sub > button {
  appearance: none;
  background: none;
  border: 0;
  color: var(--on-dark-dim);
  text-decoration: none;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 15px;
}
.site-nav > a:hover,
.has-sub > button:hover,
.site-nav > a.is-active,
.has-sub.is-active > button { color: var(--on-dark); }
.site-nav > a.is-active,
.has-sub.is-active > button { box-shadow: inset 0 -2px 0 var(--copper); }

.has-sub { position: relative; }
.sub {
  display: none;
  position: absolute;
  top: calc(100% - 2px);
  left: 0;
  min-width: 240px;
  padding: 8px;
  background: #1b242b;
  border: 1px solid rgba(231, 237, 241, 0.12);
}
.has-sub:hover .sub,
.has-sub:focus-within .sub,
.has-sub.open .sub { display: grid; }
.sub a {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 12px;
  text-decoration: none;
  color: var(--on-dark);
}
.sub a:hover { background: rgba(231, 237, 241, 0.06); }
.sub small { color: var(--on-dark-dim); }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 0;
  background: transparent;
  padding: 10px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  margin: 5px 0;
  background: var(--on-dark);
}

.stage {
  position: relative;
  min-height: calc(100vh - var(--header));
  display: grid;
  align-items: end;
}
.stage-photo {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: left center;
}
.stage::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(18, 24, 28, 0.94) 0%, rgba(18, 24, 28, 0.25) 48%, rgba(18, 24, 28, 0.28) 100%);
}
.stage-copy {
  position: relative;
  z-index: 1;
  padding: 72px 0 56px;
  max-width: 40rem;
}
.display {
  margin: 0;
  font-size: clamp(2.5rem, 6.2vw, 4.75rem);
  line-height: 1.18;
}
.stage { overflow: hidden; }
.stage-photo { min-width: 0; max-width: 100%; }
.lede, .intro {
  max-width: 38rem;
  margin: 16px 0 0;
  color: var(--on-dark-dim);
}
html.theme-light .intro,
html.theme-light .muted { color: var(--metal); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  text-decoration: none;
  border: 1px solid transparent;
  background: var(--on-dark);
  color: var(--chassis);
}
.btn:hover { background: #fff; }
.btn-quiet {
  background: transparent;
  color: var(--on-dark);
  border-color: rgba(231, 237, 241, 0.45);
}
.btn-quiet:hover { background: rgba(231, 237, 241, 0.08); }
html.theme-light .btn { background: var(--chassis); color: var(--on-dark); }
html.theme-light .btn:hover { background: #243038; }
html.theme-light .btn-quiet {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.section { padding: 56px 0 72px; }
.section h2, .block h2 {
  margin: 0 0 20px;
  font-size: 1.7rem;
}
.bench {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 18px 14px;
}
.bench a { text-decoration: none; color: inherit; }
.bench img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  object-position: center;
  background: #e7ebf0;
}
.bench img.full,
.shot img.full {
  object-fit: contain;
}
.bench .model {
  display: block;
  margin-top: 10px;
  font-size: 1.15rem;
}
.bench p { margin: 2px 0 0; color: var(--on-dark-dim); font-size: 14px; }
html.theme-light .bench p { color: var(--metal); }

.scope {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid rgba(231, 237, 241, 0.16);
}
.scope a {
  display: block;
  padding: 24px 28px 8px 0;
  text-decoration: none;
}
.scope a + a { padding-left: 28px; border-left: 1px solid rgba(231, 237, 241, 0.16); }
.scope h3 { margin: 0 0 8px; font-size: 1.25rem; }
.scope p { margin: 0; color: var(--on-dark-dim); }

.kicker {
  margin: 0 0 8px;
  color: var(--metal);
  font-size: 15px;
}
.crumb { margin: 0 0 18px; color: var(--metal); font-size: 14px; }
.crumb a { color: var(--scope); text-decoration: none; }
h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 1.15;
}
.block { padding: 28px 0 8px; }
.wide-photo {
  width: 100%;
  max-height: 460px;
  object-fit: cover;
  margin: 8px 0 4px;
}

.product-lead {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(260px, 0.85fr);
  gap: 40px;
  align-items: end;
  padding-bottom: 8px;
}
.shot img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  object-position: center;
}
.shot figcaption { margin: 8px 0 0; color: var(--metal); font-size: 13px; }

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}
.facts li {
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}
.facts strong {
  font-family: "Noto Serif SC", serif;
  font-size: 1.35rem;
  font-weight: 600;
}
.facts span { color: var(--metal); font-size: 14px; }

.spec { width: 100%; border-collapse: collapse; }
.spec th, .spec td {
  text-align: left;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.spec th { width: 28%; color: var(--metal); font-weight: 500; }
.note { color: var(--metal); font-size: 14px; }
html.theme-light .note a,
html.theme-light .prose a,
html.theme-light .rows a { color: var(--scope); }

.subsys { display: block; }
.subsys article {
  background: none;
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  padding: 16px 0;
  box-shadow: none;
}
.subsys h3 { margin: 0 0 6px; font-size: 1.05rem; }
.subsys p { margin: 0; color: var(--metal); max-width: 42rem; }

.matrix-wrap { overflow-x: auto; }
.matrix { width: 100%; border-collapse: collapse; min-width: 720px; font-size: 14px; }
.matrix th, .matrix td { padding: 11px 10px; border-bottom: 1px solid var(--line); text-align: center; white-space: nowrap; }
.matrix th:first-child, .matrix td:first-child { text-align: left; white-space: normal; }
.yes { color: var(--scope); }

.rows article {
  display: grid;
  grid-template-columns: 13rem minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.rows h3 { margin: 0; font-size: 1.2rem; line-height: 1.45; white-space: nowrap; }
.rows p { margin: 0 0 8px; color: var(--metal); max-width: 40rem; }
.rows a { display: inline-block; margin-top: 2px; }

.prose p { margin: 0 0 12px; max-width: 40rem; }
.en {
  margin-top: 16px;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--copper);
  color: var(--metal);
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: start;
}
.address-card h2 { margin: 0 0 12px; font-size: 1.35rem; }
.address-card p { margin: 0 0 8px; line-height: 1.65; }
.address-card a { color: var(--scope); }
form .btn { justify-self: start; }
form { display: grid; gap: 12px; }
label { display: grid; gap: 6px; font-size: 14px; }
input, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--sheet);
  border-radius: 0;
  padding: 12px 14px;
  color: var(--ink);
}
textarea { min-height: 140px; resize: vertical; }
button.btn { cursor: pointer; border: 0; }
#form-note { min-height: 1.5em; color: var(--scope); font-size: 14px; }

#site-footer {
  background: var(--chassis);
  color: var(--on-dark);
  border-top: 1px solid rgba(231, 237, 241, 0.12);
  padding: 40px 0 20px;
  margin-top: 48px;
}
html.theme-dark #site-footer { margin-top: 0; }
.foot {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 28px 40px;
  align-items: start;
}
.foot-label {
  margin: 0 0 14px;
  color: var(--on-dark);
  font-family: "Noto Serif SC", serif;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.3;
}
.foot p { margin: 0; color: var(--on-dark-dim); font-size: 15px; line-height: 1.65; }
.foot-links { display: grid; gap: 8px; }
.foot-address { margin: 0 0 8px; }
.foot a { color: var(--on-dark-dim); text-decoration: none; line-height: 1.5; }
.foot a:hover { color: var(--on-dark); }
.legal {
  margin-top: 24px;
  padding-top: 14px;
  border-top: 1px solid rgba(231, 237, 241, 0.12);
  color: var(--on-dark-dim);
  font-size: 13px;
}

@media (max-width: 980px) {
  .product-lead, .contact-grid, .scope, .foot, .rows article {
    grid-template-columns: minmax(0, 1fr);
  }
  .scope a + a { padding-left: 0; border-left: 0; border-top: 1px solid rgba(231, 237, 241, 0.16); }
  .hero-grid, .product-lead, .contact-grid { min-width: 0; }
}

@media (max-width: 860px) {
  .nav-toggle { display: block; flex: none; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header);
    padding: 8px 16px 18px;
    background: #1b242b;
    border-bottom: 1px solid rgba(231, 237, 241, 0.12);
    flex-direction: column;
    align-items: stretch;
  }
  body.nav-open .site-nav { display: flex; }
  .sub { position: static; box-shadow: none; background: transparent; border: 0; padding: 0 0 8px 12px; }
  .has-sub:hover .sub { display: none; }
  .has-sub.open .sub { display: grid; }
  .facts { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 700px) {
  .spec, .spec tbody, .spec tr, .spec th, .spec td { display: block; width: auto; }
  .spec tr { padding: 8px 0; border-bottom: 1px solid var(--line); }
  .spec th, .spec td { border: 0; padding: 2px 0; }
  .stage { display: block; min-height: 0; overflow: hidden; }
  .stage-photo { position: relative; display: block; width: 100%; max-width: 100%; height: 42vh; object-fit: cover; object-position: left center; }
  .stage-copy.wrap { width: auto; margin: 0; padding: 28px 20px 40px; }
  .lede, .display { overflow-wrap: anywhere; }
  .stage::after { background: linear-gradient(to top, var(--chassis), rgba(18, 24, 28, 0.15)); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}