:root {
  --primary: #0f766e;
  --secondary: #159a8c;
  --accent: #52c7c3;
  --dark: linear-gradient(135deg, #0b2730, #0f5b69 58%, #146f6d);
  --bg: linear-gradient(180deg, #f2fbfb 0%, #ffffff 100%);
  --soft: linear-gradient(180deg, #e8f8f7 0%, #ffffff 100%);
  --text: #17323a;
  --muted: #5d757a;
  --border: rgba(15,118,110,.12);
  --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: 1.78;
}
a { color: inherit; text-decoration: none; }
.container { width: min(var(--container), calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.header-dark .site-header {
  background: rgba(10,14,24,.86);
  color: #fff;
  border-bottom-color: rgba(255,255,255,.08);
}
.nav-row {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
.brand-badge {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  letter-spacing: .04em;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 14px 26px rgba(15,23,42,.16);
}
.brand-text strong, .brand-text em {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-text strong { font-size: 16px; }
.brand-text em { font-size: 12px; color: var(--muted); font-style: normal; }
.header-dark .brand-text em { color: rgba(255,255,255,.68); }
.site-nav {
  display: flex;
  gap: 22px;
  align-items: center;
  font-size: 15px;
}
.site-nav a {
  position: relative;
  padding: 6px 0;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transition: width .22s ease;
}
.site-nav a:hover::after { width: 100%; }
.menu-toggle {
  display: none;
  border: 0;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--soft);
  color: var(--text);
  font-size: 22px;
}

.hero {
  padding: 56px 0 44px;
  background: linear-gradient(135deg, rgba(242,251,251,.95), rgba(255,255,255,.84));
  color: #17323a;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  gap: 26px;
  align-items: stretch;
}
.hero-copy {
  padding: 34px 0 10px;
}
.eyebrow {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: #0f766e;
}
h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.16;
}
.hero-desc {
  margin: 20px 0 0;
  font-size: 17px;
  color: #597278;
}
.hero-actions, .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.hero-actions { margin-top: 26px; }
.hero-meta {
  margin-top: 18px;
  font-size: 14px;
  color: #5d757a;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 138px;
  padding: 13px 18px;
  border-radius: 16px;
  font-weight: 700;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 14px 24px rgba(15,23,42,.14);
}
.btn-secondary {
  background: rgba(255,255,255,.95);
  color: #0f766e;
  border: 1px solid rgba(15,118,110,.16);
}
.hero-side {
  padding: 22px;
  border-radius: 28px;
  background: linear-gradient(165deg, rgba(255,255,255,.92), rgba(232,248,247,.92));
  border: 1px solid rgba(15,118,110,.10);
  box-shadow: 0 24px 50px rgba(15,23,42,.10);
}
.feature-card, .mini-card {
  border-radius: 22px;
  padding: 22px;
  background: rgba(255,255,255,.95);
  border: 1px solid rgba(15,118,110,.10);
}
.feature-card span {
  display: block;
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #0f766e;
}
.feature-card strong {
  display: block;
  margin: 10px 0 10px;
  font-size: 24px;
  line-height: 1.38;
  color: #17323a;
}
.feature-card p, .mini-card p {
  margin: 0;
  color: #597278;
}
.mini-grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.mini-card h3 {
  margin: 0 0 8px;
  font-size: 22px;
}

.section {
  padding: 82px 0;
}
.section.soft {
  background: var(--soft);
}
.section.dark {
  background: var(--dark);
  color: #fff;
}
.section-grid {
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  gap: 26px;
}
.section-tag {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
}
.section.dark .section-tag {
  color: rgba(255,255,255,.72);
}
h2 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.22;
}
.panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 26px 24px;
  box-shadow: 0 18px 34px rgba(15,23,42,.05);
}
.section.dark .panel {
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.10);
  box-shadow: none;
}
.panel h3 {
  margin-top: 0;
  font-size: 24px;
}
.tag-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.tag-list li {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(15,23,42,.04);
}
.section.dark .tag-list li {
  background: rgba(255,255,255,.08);
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 18px 34px rgba(15,23,42,.05);
}
.section.dark .card {
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.10);
  box-shadow: none;
}
.card h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.4;
}
.card p {
  margin: 0;
  color: #5d757a;
}
.section.dark .card p {
  color: rgba(255,255,255,.84);
}
.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.timeline article {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 24px;
}
.timeline span {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #fff;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  margin-bottom: 14px;
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.news-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 18px 34px rgba(15,23,42,.05);
}
.news-card span {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--primary);
  font-weight: 700;
}
.news-card h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.42;
}
.news-card p {
  margin: 0;
  color: var(--muted);
}
.text-link {
  display: inline-flex;
  margin-top: 12px;
  color: var(--primary);
  font-weight: 700;
}
.contact-shell {
  display: grid;
  grid-template-columns: 1fr .92fr;
  gap: 24px;
  align-items: stretch;
}
.contact-panel {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 24px;
  padding: 28px;
}
.contact-panel span {
  font-size: 14px;
  opacity: .84;
  letter-spacing: .08em;
}
.contact-panel strong {
  display: block;
  margin: 12px 0 10px;
  font-size: 34px;
  line-height: 1.2;
}
.contact-panel p {
  margin: 0 0 8px;
  color: rgba(255,255,255,.84);
}
.footer {
  padding: 22px 0 34px;
  color: var(--muted);
  font-size: 14px;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 1040px) {
  .hero-grid, .section-grid, .contact-shell, .timeline, .cards-grid, .news-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 760px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
  .site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: calc(100% + 8px);
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 16px;
    gap: 12px;
    border-radius: 18px;
    background: rgba(255,255,255,.98);
    border: 1px solid rgba(15,118,110,.10);
    box-shadow: 0 18px 36px rgba(15,23,42,.14);
  }
  .site-nav.open { display: flex; }
  .brand-text strong { max-width: 210px; }
  .hero-grid, .section-grid, .contact-shell, .timeline, .cards-grid, .news-grid, .mini-grid {
    grid-template-columns: 1fr;
  }
  .section { padding: 64px 0; }
  .hero { padding-top: 28px; }
  .contact-panel strong { font-size: 28px; }
}