:root {
  --bg: #f6f4ea;
  --surface: #ffffff;
  --surface-alt: #eef6f3;
  --primary: #1d6b7c;
  --primary-dark: #154f5d;
  --accent: #c6922d;
  --accent-soft: #f2e1b9;
  --text: #203133;
  --muted: #5d6d6f;
  --border: #d9e3dd;
  --shadow: 0 16px 38px rgba(18, 54, 61, 0.08);
  --radius: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

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

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

.container {
  width: min(calc(100% - 32px), var(--container));
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
  background: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  z-index: 1000;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(246, 244, 234, 0.92);
  border-bottom: 1px solid rgba(217, 227, 221, 0.95);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand {
  display: grid;
  gap: 4px;
}

.brand a {
  display: grid;
  gap: 4px;
}

.brand strong {
  font-size: 1.05rem;
}

.brand-tag,
.section-kicker,
.eyebrow,
.update-tip,
.page-chip {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-tag,
.section-kicker,
.eyebrow,
.page-chip {
  color: var(--primary);
  font-weight: 700;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--muted);
  font-size: 0.96rem;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.footer-links a:hover,
.footer-links a:focus-visible,
.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--primary);
}

.hero,
.page-hero {
  background: radial-gradient(circle at top right, rgba(198, 146, 45, 0.14), transparent 28%), linear-gradient(180deg, #f5f7f0 0%, #f6f4ea 100%);
}

.hero {
  padding: 52px 0 18px;
}

.page-hero {
  padding: 58px 0 36px;
}

.hero-grid,
.trust-grid,
.footer-grid,
.cta-inner,
.page-hero-grid,
.dual-grid,
.story-grid,
.case-grid,
.guide-grid,
.science-grid,
.link-grid {
  display: grid;
  gap: 28px;
}

.hero-grid {
  grid-template-columns: 1.2fr 1fr;
  align-items: start;
}

.hero-side {
  display: grid;
  gap: 14px;
}

.hero-visual,
.page-hero-visual {
  margin: 0;
  overflow: hidden;
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: #dfece7;
}

.hero-visual img,
.page-hero-visual img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hero-copy h1,
.section-head h2,
.cta-inner h2,
.site-footer h2,
.page-hero-copy h1 {
  margin: 0;
  line-height: 1.25;
}

.hero-copy h1,
.page-hero-copy h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  margin-top: 10px;
}

.hero-desc,
.page-intro,
.page-hero-copy p,
.ai-note,
.case-meta,
.guide-card p,
.science-card p,
.copy-card p,
.scene-card p,
.story-card p,
.timeline-card p,
.page-callout p {
  color: var(--muted);
}

.hero-desc,
.page-intro {
  margin: 18px 0 22px;
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 22px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-weight: 700;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--primary-dark);
}

.btn-secondary {
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.78);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
}

.hero-points,
.trust-list,
.contact-list,
.footer-links,
.page-highlights,
.ai-bullets,
.timeline-list,
.check-list,
.step-list,
.science-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-points,
.ai-bullets,
.timeline-list,
.check-list,
.step-list,
.science-list {
  display: grid;
  gap: 10px;
}

.hero-points li::before,
.trust-list li::before,
.contact-list li::before,
.page-highlights li::before,
.ai-bullets li::before,
.timeline-list li::before,
.check-list li::before,
.step-list li::before,
.science-list li::before {
  content: "●";
  color: var(--accent);
  margin-right: 10px;
}

.contact-card,
.stat-card,
.product-card,
.feature-card,
.news-card,
.faq-list details,
.summary-card,
.hub-card,
.copy-card,
.story-card,
.timeline-card,
.case-card,
.guide-card,
.science-card,
.page-callout,
.link-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.contact-card,
.summary-card,
.product-card,
.feature-card,
.news-card,
.hub-card,
.copy-card,
.story-card,
.timeline-card,
.case-card,
.guide-card,
.science-card,
.page-callout,
.link-card {
  padding: 24px;
}

.contact-card {
  padding: 20px 24px;
}

.contact-card h2,
.summary-card h3,
.product-card h3,
.feature-card h3,
.news-card h3,
.scene-card h3,
.hub-card h3,
.copy-card h3,
.story-card h3,
.timeline-card h3,
.case-card h3,
.guide-card h3,
.science-card h3,
.link-card h3 {
  margin-top: 0;
}

.contact-card dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 0;
}

.contact-card div:last-child {
  grid-column: 1 / -1;
}

.contact-card dt {
  font-size: 0.92rem;
  color: var(--muted);
}

.contact-card dd {
  margin: 6px 0 0;
  font-size: 1.08rem;
  font-weight: 700;
}

.note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.section {
  padding: 70px 0;
}

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: 28px;
}

.section-head p,
.page-hero-copy p,
.page-meta {
  margin: 0;
}

.narrow {
  max-width: 760px;
}

.with-action {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
}

.update-tip,
.page-chip {
  background: var(--accent-soft);
  color: #805e14;
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 700;
}

.update-tip {
  white-space: nowrap;
  flex-shrink: 0;
}

.ai-summary-section {
  padding-top: 28px;
  padding-bottom: 20px;
}

.ai-summary-grid,
.supply-table {
  margin-top: 24px;
}

.ai-summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.summary-card p,
.summary-card li,
.product-card p,
.product-card li,
.feature-card p,
.hub-card p,
.copy-card p,
.story-card p,
.timeline-card p,
.case-card p,
.guide-card li,
.science-card li,
.link-card p {
  color: var(--muted);
}

.summary-card ul,
.product-card ul {
  margin: 0;
  padding-left: 18px;
}

.supply-table {
  display: grid;
  gap: 12px;
  margin-bottom: 20px;
}

.supply-row {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr 1.1fr 1fr;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.supply-head {
  background: rgba(29, 107, 124, 0.08);
  color: var(--primary);
  font-weight: 700;
  box-shadow: none;
}

.intro {
  padding-bottom: 20px;
}

.metrics {
  padding-top: 24px;
}

.stats-grid,
.product-grid,
.feature-grid,
.news-grid,
.hub-grid {
  display: grid;
  gap: 20px;
}

.stats-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.stat-card {
  padding: 28px 22px;
  text-align: center;
}

.stat-card strong {
  display: block;
  color: var(--primary);
  font-size: 1.9rem;
}

.stat-card span {
  color: var(--muted);
}

.product-grid,
.feature-grid,
.news-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.hub-grid,
.case-grid,
.guide-grid,
.science-grid,
.link-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.scene-section {
  padding-top: 26px;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.scene-card {
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.scene-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 16px;
  margin-bottom: 18px;
}

.alt-bg,
.page-alt {
  background: linear-gradient(180deg, rgba(29, 107, 124, 0.03) 0%, rgba(238, 246, 243, 0.85) 100%);
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.trust-grid,
.story-grid,
.dual-grid,
.page-hero-grid {
  grid-template-columns: 1fr 1fr;
  align-items: start;
}

.trust-list {
  display: grid;
  gap: 14px;
}

.content-signals,
.ai-footer-note,
.page-meta,
.page-highlights {
  display: grid;
  gap: 10px;
}

.content-signals {
  margin-bottom: 22px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px dashed var(--border);
  border-radius: 16px;
  color: var(--muted);
}

.page-hero {
  padding-bottom: 24px;
}

.page-hero-copy {
  display: grid;
  gap: 14px;
}

.page-meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  row-gap: 6px;
  column-gap: 0;
  color: var(--muted);
  font-size: 0.94rem;
  margin-bottom: 8px;
  line-height: 1.7;
}

.breadcrumb a,
.breadcrumb-current {
  position: relative;
  color: var(--muted);
}

.breadcrumb > * + * {
  padding-left: 18px;
}

.breadcrumb > * + *::before {
  content: "›";
  position: absolute;
  left: 6px;
  color: rgba(93, 109, 111, 0.7);
}

.breadcrumb-current {
  color: var(--text);
  font-weight: 600;
}

.page-highlights {
  margin-top: 6px;
}

.page-hub {
  padding-top: 24px;
}

.copy-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.copy-card strong,
.case-tag,
.guide-tag,
.science-tag {
  color: var(--primary);
}

.case-meta,
.science-card p,
.guide-card p {
  margin-bottom: 16px;
}

.case-card,
.guide-card,
.science-card,
.link-card {
  display: grid;
  gap: 12px;
}

.case-tag,
.guide-tag,
.science-tag {
  font-size: 0.88rem;
  font-weight: 700;
}

.ai-footer-note {
  padding-bottom: 26px;
  color: rgba(255, 255, 255, 0.78);
}

.ai-footer-note p,
.footer-bottom p {
  margin: 0;
}

.news-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  background: rgba(29, 107, 124, 0.08);
  color: var(--primary);
  font-weight: 700;
}

.news-card p {
  margin-bottom: 16px;
  color: var(--muted);
}

.news-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.news-title {
  margin: 0 0 12px;
  color: var(--text);
  transition: color 0.2s ease;
}

.news-card:hover .news-title,
.news-card:focus-within .news-title,
.news-card:hover .news-link,
.news-card:focus-within .news-link {
  color: var(--primary);
}

.news-card-link:focus-visible {
  outline: 2px solid rgba(29, 107, 124, 0.35);
  outline-offset: 6px;
  border-radius: 16px;
}

.news-link {
  color: var(--primary);
  font-weight: 700;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-list details {
  padding: 18px 20px;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-list p {
  margin: 14px 0 0;
  color: var(--muted);
}

.science-article-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.science-article-card,
.related-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.science-article-card img,
.related-card img,
.article-cover img {
  width: 100%;
  object-fit: cover;
}

.science-article-card img,
.related-card img {
  aspect-ratio: 16 / 10;
}

.science-article-card a,
.related-card a {
  display: block;
}

.science-article-body,
.related-card-body {
  padding: 20px 22px 22px;
}

.science-article-body h3,
.related-card-body h3 {
  margin: 12px 0 10px;
  line-height: 1.4;
}

.science-article-body p,
.related-card-body p {
  margin: 0 0 14px;
  color: var(--muted);
}

.article-shell {
  padding-bottom: 10px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.8fr);
  gap: 28px;
  align-items: start;
}

.article-content,
.article-sidebar {
  display: grid;
  gap: 20px;
}

.article-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.article-inline-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  color: var(--muted);
  font-size: 0.94rem;
}

.article-lead {
  margin: 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.article-cover {
  margin: 0;
  overflow: hidden;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #dfece7;
}

.article-cover img {
  aspect-ratio: 16 / 9;
}

.article-summary-note {
  padding: 18px 20px;
  border-radius: 18px;
  background: rgba(29, 107, 124, 0.08);
  color: var(--text);
}

.article-prose {
  display: grid;
  gap: 18px;
}

.article-block h2 {
  margin: 0 0 12px;
  line-height: 1.35;
}

.article-block p {
  margin: 0;
  color: var(--muted);
}

.article-sidebar {
  position: sticky;
  top: 92px;
}

.tips-card .science-list {
  gap: 12px;
}

.contact-cta-card .contact-list {
  display: grid;
  gap: 10px;
}

.related-card-body .badge,
.science-article-body .badge {
  margin-bottom: 8px;
}

.cta-band {
  padding-top: 20px;
}


.cta-inner {
  grid-template-columns: 1fr auto;
  align-items: center;
  background: linear-gradient(120deg, var(--primary) 0%, #2f8261 100%);
  color: #fff;
  padding: 30px;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.site-footer {
  margin-top: 80px;
  background: #173238;
  color: rgba(255, 255, 255, 0.92);
  padding-top: 56px;
}

.footer-grid {
  grid-template-columns: 1.2fr 1fr 0.8fr;
}

.site-footer h2,
.site-footer h3 {
  margin-top: 0;
}

.footer-links {
  display: grid;
  gap: 10px;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: 22px 0 28px;
  margin-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
}

.footer-bottom a:hover,
.footer-bottom a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
}

.floating-contact {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  min-width: 112px;
  min-height: 48px;
  border-radius: 999px;
  background: linear-gradient(120deg, var(--accent) 0%, #e2b24d 100%);
  color: #2f2405;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 18px 34px rgba(112, 82, 20, 0.28);
}

@media (max-width: 1024px) {
  .hero-grid,
  .trust-grid,
  .footer-grid,
  .cta-inner,
  .stats-grid,
  .product-grid,
  .feature-grid,
  .news-grid,
  .scene-grid,
  .ai-summary-grid,
  .page-hero-grid,
  .dual-grid,
  .story-grid,
  .case-grid,
  .guide-grid,
  .science-grid,
  .hub-grid,
  .copy-grid,
  .link-grid,
  .science-article-grid,
  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid,
  .page-hero-grid,
  .trust-grid,
  .story-grid,
  .dual-grid,
  .footer-grid,
  .cta-inner,
  .supply-row,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
  }
}

@media (max-width: 760px) {
  .site-header {
    position: static;
  }

  .nav-wrap,
  .site-nav,
  .with-action,
  .hero-actions,
  .footer-bottom {
    display: grid;
    gap: 12px;
  }

  .site-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section {
    padding: 56px 0;
  }

  .hero,
  .page-hero {
    padding-top: 34px;
  }

  .hero-copy h1,
  .page-hero-copy h1 {
    font-size: 2rem;
  }

  .stats-grid,
  .product-grid,
  .feature-grid,
  .news-grid,
  .scene-grid,
  .ai-summary-grid,
  .copy-grid,
  .hub-grid,
  .case-grid,
  .guide-grid,
  .science-grid,
  .link-grid,
  .science-article-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .contact-card,
  .stat-card,
  .product-card,
  .feature-card,
  .news-card,
  .faq-list details,
  .cta-inner,
  .hub-card,
  .copy-card,
  .story-card,
  .timeline-card,
  .case-card,
  .guide-card,
  .science-card,
  .page-callout,
  .link-card {
    border-radius: 16px;
  }

  .floating-contact {
    left: 16px;
    right: 16px;
    bottom: 16px;
    width: auto;
  }
}