:root {
  --bg: #fbf9f8;
  --bg-alt: #f6f3f2;
  --bg-deep: #efe9e7;
  --surface: #ffffff;
  --surface-muted: rgba(255, 255, 255, 0.72);
  --text: #171717;
  --text-soft: #585656;
  --text-faint: #7b7776;
  --line: rgba(164, 0, 25, 0.12);
  --line-strong: rgba(23, 23, 23, 0.1);
  --primary: #a40019;
  --primary-bright: #cf1026;
  --shadow: 0 20px 40px rgba(27, 28, 28, 0.08);
  --radius: 4px;
  --container: min(1180px, calc(100vw - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Aptos", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top right, rgba(207, 16, 38, 0.06), transparent 28%),
    linear-gradient(180deg, #fff 0%, var(--bg) 22%, var(--bg-alt) 100%);
  color: var(--text);
  line-height: 1.6;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

.site-shell {
  min-height: 100vh;
}

.container {
  width: var(--container);
  margin: 0 auto;
}

.section {
  padding: 96px 0;
}

.section.alt {
  background: linear-gradient(180deg, var(--bg-alt), #f1ecea);
}

.section.deep {
  background: linear-gradient(180deg, #38292b, #1f1819);
  color: #fff;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: none;
  color: var(--primary);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  background: rgba(164, 0, 25, 0.08);
  backdrop-filter: blur(10px);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.display {
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.title-xl {
  font-size: clamp(3.4rem, 7vw, 6.8rem);
}

.title-lg {
  font-size: clamp(2.6rem, 5vw, 4.4rem);
}

.title-md {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.05;
}

.lede,
.muted {
  color: var(--text-soft);
}

.muted {
  font-size: 0.95rem;
}

.accent {
  color: var(--primary);
}

.grid-hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(23, 23, 23, 0.06);
  background: rgba(251, 249, 248, 0.85);
  backdrop-filter: blur(18px);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: 20px;
}

.brand {
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.04em;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 10px 24px rgba(27, 28, 28, 0.12);
}

.brand-mark {
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  color: var(--text-soft);
  font-weight: 600;
}

.nav-links a {
  position: relative;
  padding: 8px 0;
}

.nav-links a.active,
.nav-links a:hover {
  color: var(--text);
}

.nav-links a.active::after,
.nav-links a:hover::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--primary-bright));
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.lang-switch {
  min-width: 84px;
}

.button,
.button-ghost,
.button-muted {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 24px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-bright));
  box-shadow: var(--shadow);
}

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

.button-ghost {
  background: transparent;
  border: 1px solid rgba(23, 23, 23, 0.14);
  color: var(--text);
}

.button-muted {
  background: rgba(23, 23, 23, 0.05);
  color: var(--text);
}

.hero-copy p {
  max-width: 640px;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-panel,
.media-panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(164, 0, 25, 0.2), transparent 48%),
    linear-gradient(160deg, #31292a 0%, #595354 45%, #ece7e5 100%);
  box-shadow: var(--shadow);
}

.hero-panel {
  min-height: 560px;
}

.media-panel {
  min-height: 360px;
}

.panel-image,
.visual-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.panel-image {
  position: absolute;
  inset: 0;
}

.hero-panel::before,
.media-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, transparent 28%, rgba(255, 255, 255, 0.36) 40%, transparent 52%),
    repeating-linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.05) 1px, transparent 1px, transparent 18px);
  mix-blend-mode: screen;
}

.panel-caption {
  position: absolute;
  left: 28px;
  right: 28px;
  bottom: 28px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  border-left: 4px solid var(--primary);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 56px;
}

.metric {
  background: var(--surface);
  padding: 28px;
  box-shadow: 0 14px 28px rgba(27, 28, 28, 0.04);
}

.metric strong {
  display: block;
  font-size: 2rem;
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--primary);
}

.cards,
.news-grid,
.product-grid,
.contact-grid,
.spec-grid,
.service-grid,
.timeline,
.stats-grid,
.blog-list {
  display: grid;
  gap: 22px;
}

.cards,
.product-grid,
.service-grid,
.timeline {
  grid-template-columns: repeat(3, 1fr);
}

.news-grid {
  grid-template-columns: 1.4fr 1fr;
}

.contact-grid,
.feature-band {
  grid-template-columns: 1fr 1fr;
  align-items: start;
}

.spec-grid,
.stats-grid {
  grid-template-columns: repeat(4, 1fr);
}

.blog-list {
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
}

.card,
.news-card,
.product-card,
.info-card,
.contact-card,
.stat-card,
.timeline-card,
.blog-card,
.sidebar-card,
.service-card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 14px 28px rgba(27, 28, 28, 0.04);
}

.card,
.news-card,
.product-card,
.info-card,
.contact-card,
.stat-card,
.timeline-card,
.sidebar-card,
.service-card {
  padding: 28px;
}

.blog-card {
  display: grid;
  grid-template-columns: 180px 1fr;
}

.product-card-link {
  display: block;
  color: inherit;
}

.product-card-link:hover .product-card,
.product-card-link:focus-visible .product-card {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(27, 28, 28, 0.08);
}

.blog-body {
  padding: 26px;
}

.card::before,
.news-card::before,
.product-card::before,
.timeline-card::before,
.service-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), transparent);
}

.visual-block,
.article-thumb,
.product-visual,
.striped-visual {
  min-height: 180px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.2)),
    linear-gradient(160deg, #484142 0%, #8f8782 46%, #ebe5e1 100%);
}

.product-visual {
  min-height: 260px;
}

.article-thumb,
.product-visual {
  overflow: hidden;
}

.product-visual.contained {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 26px;
  background:
    radial-gradient(circle at top left, rgba(164, 0, 25, 0.06), transparent 34%),
    linear-gradient(180deg, #ffffff, #f6f3f2);
}

.product-visual.contained .visual-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.striped-visual {
  background:
    linear-gradient(115deg, rgba(255, 255, 255, 0.4), transparent 40%),
    repeating-linear-gradient(100deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.04) 10px, rgba(0, 0, 0, 0.03) 10px, rgba(0, 0, 0, 0.03) 20px),
    linear-gradient(160deg, #373334, #7f7873 52%, #f3efec);
}

.card h3,
.news-card h3,
.product-card h3,
.timeline-card h3,
.service-card h3 {
  margin: 18px 0 10px;
  font-size: 1.35rem;
  line-height: 1.15;
}

.product-card {
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 24px;
  margin-bottom: 34px;
}

.section-head p {
  max-width: 640px;
}

.feature-copy {
  padding: 40px;
  background: #21191a;
  color: #fff;
}

.feature-copy .muted {
  color: rgba(255, 255, 255, 0.72);
}

.feature-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.feature-stack .service-card {
  background: rgba(255, 255, 255, 0.94);
  color: var(--text);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.14);
  border-top: 3px solid var(--primary);
}

.feature-stack .service-card h3 {
  color: var(--text);
  margin-top: 0;
}

.feature-stack .service-card .muted {
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.75;
}

.pill-list,
.tag-list,
.meta-list,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill,
.tag {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  background: rgba(164, 0, 25, 0.08);
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 700;
}

.tag {
  background: rgba(23, 23, 23, 0.06);
  color: var(--text-soft);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  box-shadow: 0 16px 30px rgba(27, 28, 28, 0.05);
}

.spec-table th,
.spec-table td {
  text-align: left;
  padding: 18px 20px;
  font-size: 0.95rem;
}

.spec-table thead th {
  background: #1f1919;
  color: #fff;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.spec-table tbody tr:nth-child(odd) {
  background: #fff;
}

.spec-table tbody tr:nth-child(even) {
  background: #f7f4f3;
}

.spec-table strong {
  color: var(--primary);
}

.quote-band {
  padding: 48px;
  background: linear-gradient(135deg, var(--primary), #6f0818);
  color: #fff;
  box-shadow: var(--shadow);
}

.form-card {
  padding: 32px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.field {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.field label {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-faint);
}

.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 14px 0;
  border: none;
  border-bottom: 1px solid rgba(23, 23, 23, 0.16);
  background: transparent;
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-bottom-color: var(--primary);
  box-shadow: inset 0 -2px 0 var(--primary);
}

.field textarea {
  min-height: 120px;
  resize: vertical;
}

.form-note,
.status-note {
  font-size: 0.88rem;
  color: var(--text-faint);
}

.status-note {
  min-height: 1.4em;
  margin-top: 12px;
}

.sidebar-stack {
  display: grid;
  gap: 18px;
  position: sticky;
  top: 108px;
}

.article-meta {
  color: var(--text-faint);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.split-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}

.footer {
  background: #221c1c;
  color: rgba(255, 255, 255, 0.72);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 28px;
  padding: 64px 0;
}

.footer h4,
.footer strong {
  color: #fff;
}

.footer .brand-logo {
  box-shadow: none;
}

.footer a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 18px 0 30px;
  font-size: 0.82rem;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) 320px;
  gap: 28px;
  align-items: start;
}

.article-main {
  background: var(--surface);
  padding: 32px;
  box-shadow: 0 16px 30px rgba(27, 28, 28, 0.05);
}

.article-cover {
  position: relative;
  min-height: 360px;
  margin-top: 24px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(164, 0, 25, 0.16), transparent 48%),
    linear-gradient(160deg, #31292a 0%, #595354 45%, #ece7e5 100%);
}

.article-cover .panel-image {
  position: absolute;
  inset: 0;
}

.rich-text {
  margin-top: 28px;
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.85;
}

.rich-text h2 {
  margin: 30px 0 14px;
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1.2;
}

.rich-text p,
.rich-text ul {
  margin: 0 0 16px;
}

.rich-text ul {
  padding-left: 20px;
}

@media (max-width: 1100px) {
  .grid-hero,
  .feature-band,
  .contact-grid,
  .split-layout,
  .blog-list,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .cards,
  .product-grid,
  .spec-grid,
  .service-grid,
  .timeline,
  .stats-grid,
  .metrics,
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .blog-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  :root {
    --container: min(100vw - 32px, 100vw - 32px);
  }

  .section {
    padding: 72px 0;
  }

  .nav-row {
    min-height: auto;
    padding: 18px 0;
    flex-wrap: wrap;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    order: 3;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: space-between;
    font-size: 0.92rem;
  }

  .nav-actions {
    margin-left: auto;
    justify-content: flex-end;
  }

  .cards,
  .product-grid,
  .spec-grid,
  .service-grid,
  .timeline,
  .stats-grid,
  .metrics,
  .footer-grid,
  .feature-stack {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .hero-panel {
    min-height: 420px;
  }

  .panel-caption {
    left: 18px;
    right: 18px;
    bottom: 18px;
    padding: 18px;
  }

  .quote-band,
  .feature-copy,
  .form-card {
    padding: 28px;
  }
}