:root {
  --color-ink: #141414;
  --color-brand-ink: #333333;
  --color-muted: #5f6368;
  --color-line: #e5e7eb;
  --color-panel: #f7f8fa;
  --color-brand: #d80f16;
  --color-brand-dark: #a90b10;
  --color-orange: #f05a1a;
  --shadow-soft: 0 18px 45px rgba(18, 24, 40, 0.09);
  --shadow-card: 0 10px 28px rgba(18, 24, 40, 0.08);
  --content-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--color-ink);
  background: #ffffff;
  font-family: "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(229, 231, 235, 0.8);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--content-width), calc(100% - 40px));
  height: 72px;
  margin: 0 auto;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
  font-weight: 800;
  letter-spacing: 0;
  cursor: pointer;
}

.brand strong {
  color: var(--color-brand-ink);
  font-size: 28px;
  line-height: 1;
  font-weight: 500;
}

.brand span {
  color: var(--color-brand-ink);
  font-size: 13px;
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--color-brand-ink);
  font-size: 15px;
}

.nav-links a:hover {
  color: #000000;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 22px;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex: 0 0 auto;
  padding: 3px;
  border: 1px solid #cfd4dc;
  border-radius: 999px;
  background: #f6f7f9;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 4px 14px rgba(18, 24, 40, 0.08);
}

.language-switch a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 32px;
  padding: 0 13px;
  border: 1px solid transparent;
  border-radius: 999px;
  color: #424850;
  background: #ffffff;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  transition: background 160ms ease, color 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.language-switch a:hover {
  color: var(--color-ink);
  border-color: #d9dde4;
  box-shadow: 0 4px 10px rgba(18, 24, 40, 0.08);
}

.language-switch a[aria-current="page"] {
  color: #ffffff;
  background: var(--color-brand);
  border-color: var(--color-brand);
  box-shadow: 0 5px 14px rgba(216, 15, 22, 0.24);
}

.page {
  overflow: hidden;
}

.hero {
  background:
    radial-gradient(circle at 78% 20%, rgba(240, 90, 26, 0.12), transparent 28%),
    linear-gradient(180deg, #ffffff 0%, #fbfbfc 100%);
  border-bottom: 1px solid var(--color-line);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(480px, 1.15fr);
  align-items: center;
  gap: 42px;
  width: min(var(--content-width), calc(100% - 40px));
  min-height: calc(100vh - 72px);
  min-height: 680px;
  margin: 0 auto;
  padding: 58px 0 46px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--color-brand);
  font-size: 15px;
  font-weight: 800;
}

.hero h1 {
  max-width: 580px;
  margin: 0;
  color: #111111;
  font-size: clamp(36px, 4.8vw, 62px);
  line-height: 1.03;
  letter-spacing: 0;
}

.hero-subtitle {
  margin: 18px 0 0;
  color: var(--color-brand);
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 800;
  white-space: nowrap;
}

.page-en .hero-subtitle {
  max-width: 520px;
  white-space: normal;
}

.hero-copy {
  max-width: 600px;
  margin: 24px 0 0;
  color: #30343a;
  font-size: 17px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #ffffff;
  background: var(--color-brand);
  box-shadow: 0 12px 28px rgba(216, 15, 22, 0.22);
}

.button-primary:hover {
  background: var(--color-brand-dark);
}

.button-secondary {
  color: var(--color-ink);
  background: #ffffff;
  border-color: var(--color-line);
}

.button-secondary:hover {
  border-color: #c9cdd4;
  box-shadow: var(--shadow-card);
}

.hero-media {
  align-self: end;
}

.hero-media img {
  width: min(760px, 100%);
  aspect-ratio: 1672 / 941;
  object-fit: contain;
  margin-left: auto;
  filter: drop-shadow(0 30px 38px rgba(22, 29, 43, 0.14));
}

.section {
  width: min(var(--content-width), calc(100% - 40px));
  margin: 0 auto;
  padding: 76px 0;
}

.section-header {
  max-width: 720px;
  margin-bottom: 32px;
}

.section-kicker {
  margin: 0 0 8px;
  color: var(--color-brand);
  font-size: 14px;
  font-weight: 800;
}

.section h2 {
  margin: 0;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-lede {
  margin: 16px 0 0;
  color: var(--color-muted);
  font-size: 17px;
}

.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.feature-card,
.component-card,
.contact-panel,
.brochure-panel {
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow-card);
}

.feature-card {
  padding: 26px;
}

.feature-card h3,
.component-card h3 {
  margin: 0 0 10px;
  font-size: 21px;
  line-height: 1.25;
}

.feature-card p,
.component-card p {
  margin: 0;
  color: var(--color-muted);
}

.component-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.component-card {
  padding: 24px;
}

.component-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 18px;
  border-radius: 8px;
  color: var(--color-brand);
  background: #fff1f1;
}

.component-icon svg {
  width: 28px;
  height: 28px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.spec-band {
  background: var(--color-panel);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow-soft);
}

.spec-table {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
  font-size: 15px;
}

.spec-table th,
.spec-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--color-line);
  border-right: 1px solid var(--color-line);
  text-align: center;
  white-space: nowrap;
}

.spec-table th:first-child,
.spec-table td:first-child {
  text-align: left;
  font-weight: 700;
}

.spec-table th {
  background: #fbfbfc;
  color: var(--color-brand);
  font-weight: 900;
}

.spec-table th:first-child,
.spec-table th:nth-child(2) {
  color: #151515;
}

.spec-table tr:last-child td {
  border-bottom: 0;
}

.spec-table th:last-child,
.spec-table td:last-child {
  border-right: 0;
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.metric-callout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  margin-top: 28px;
  padding: 26px;
  border: 1px solid rgba(216, 15, 22, 0.18);
  border-radius: 8px;
  background: linear-gradient(90deg, #fff8f8, #ffffff);
}

.metric-callout p {
  margin: 0;
  color: #383c42;
  font-size: 17px;
}

.metric-callout strong {
  color: var(--color-brand);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  white-space: nowrap;
}

.brochure-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 34px;
}

.brochure-panel {
  overflow: hidden;
}

.brochure-panel img {
  width: 100%;
  height: auto;
}

.contact-band {
  background: #171717;
  color: #ffffff;
}

.contact-band .section {
  padding: 58px 0;
}

.contact-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  padding: 32px;
  color: #ffffff;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: none;
}

.contact-panel h2 {
  color: #ffffff;
}

.contact-list {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.82);
  list-style: none;
}

.site-footer {
  display: grid;
  gap: 6px;
  padding: 24px 16px;
  color: #8b8f97;
  background: #111111;
  font-size: 14px;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: inherit;
}

.site-footer a:hover {
  color: #ffffff;
}

@media (max-width: 960px) {
  .nav {
    height: auto;
    padding: 16px 0;
    align-items: flex-start;
    gap: 16px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px 18px;
  }

  .nav-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .hero-inner,
  .overview-grid,
  .brochure-section,
  .contact-panel {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    min-height: 0;
    padding: 48px 0 30px;
  }

  .hero-media {
    align-self: center;
  }

  .hero-media img {
    margin: 0 auto;
  }

  .component-grid,
  .advantage-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-panel {
    gap: 18px;
  }
}

@media (max-width: 620px) {
  .nav,
  .section,
  .hero-inner {
    width: min(100% - 28px, var(--content-width));
  }

  .nav {
    display: block;
  }

  .nav-links {
    justify-content: flex-start;
    margin-top: 14px;
    font-size: 14px;
  }

  .nav-actions {
    align-items: flex-start;
    justify-content: flex-start;
    margin-top: 14px;
  }

  .language-switch a {
    min-width: 38px;
    height: 28px;
    font-size: 12px;
  }

  .brand strong {
    font-size: 24px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-subtitle {
    font-size: 17px;
    white-space: normal;
  }

  .hero-copy,
  .section-lede,
  .metric-callout p {
    font-size: 16px;
  }

  .button {
    width: 100%;
  }

  .section {
    padding: 56px 0;
  }

  .component-grid,
  .advantage-grid {
    grid-template-columns: 1fr;
  }

  .metric-callout {
    grid-template-columns: 1fr;
  }

  .metric-callout strong {
    white-space: normal;
  }

  .contact-panel {
    padding: 24px;
  }
}