:root {
  --header-offset: 92px;
  --bg: #f4f7f7;
  --surface: #ffffff;
  --surface-soft: #eef3f2;
  --text: #142022;
  --muted: #4f6468;
  --line: #d4dfde;
  --brand: #0d7a74;
  --brand-deep: #085754;
  --accent: #ff8a3d;
  --shadow: 0 20px 60px rgba(13, 42, 46, 0.12);
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

#top,
section[id] {
  scroll-margin-top: var(--header-offset);
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 85% -5%, rgba(13, 122, 116, 0.14), transparent 28%),
    radial-gradient(circle at -10% 20%, rgba(255, 138, 61, 0.16), transparent 34%),
    var(--bg);
  line-height: 1.7;
}

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

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

.container {
  width: min(1140px, calc(100% - 2.2rem));
  margin: 0 auto;
}

.section {
  padding: 88px 0;
}

.section-soft {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.75), rgba(240, 246, 245, 0.9));
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: rgba(244, 247, 247, 0.86);
  border-bottom: 1px solid rgba(13, 122, 116, 0.14);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
  font-weight: 700;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  letter-spacing: 0.5px;
}

.brand-text {
  font-size: 1.03rem;
}

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

.main-nav a {
  color: #20464a;
  font-weight: 500;
  position: relative;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
  background: linear-gradient(90deg, var(--brand), transparent 82%);
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 999px;
  padding: 0.42rem 0.95rem;
  font-size: 0.95rem;
}

.hero {
  padding-top: 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 44px;
}

.eyebrow {
  margin: 0;
  color: var(--brand);
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.25;
}

h1 {
  margin: 14px 0 18px;
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-family: "Space Grotesk", "Noto Sans SC", sans-serif;
}

h2 {
  margin: 10px 0 0;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.lead {
  margin: 0;
  color: var(--muted);
  max-width: 58ch;
}

.cta-row {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.96rem;
  padding: 0.72rem 1.2rem;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--brand), var(--brand-deep));
  color: #fff;
  box-shadow: 0 10px 24px rgba(8, 87, 84, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 14px 30px rgba(8, 87, 84, 0.35);
}

.btn-ghost {
  border-color: var(--line);
  background: #fff;
  color: var(--text);
}

.btn.wide {
  width: 100%;
}

.hero-points {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.hero-points li {
  position: relative;
  padding-left: 24px;
  color: #2c4347;
}

.hero-points li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--accent), var(--brand));
}

.product-card {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.98), rgba(238, 245, 244, 0.98));
  border-radius: var(--radius-lg);
  border: 1px solid rgba(13, 122, 116, 0.16);
  padding: 22px;
  box-shadow: var(--shadow);
}

.product-card img {
  border-radius: 14px;
}

.section-head {
  margin-bottom: 28px;
}

.feature-grid,
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card,
.case-card,
.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: 0 8px 30px rgba(16, 48, 53, 0.06);
}

.feature-card,
.case-card {
  padding: 22px;
}

.feature-card h3,
.case-card h3 {
  margin-bottom: 9px;
}

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

.case-card span {
  display: inline-block;
  margin-top: 14px;
  font-weight: 700;
  color: var(--brand-deep);
}

.specs-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

.specs-table th,
.specs-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.specs-table th {
  background: #f2f8f7;
  color: #1c3c3f;
  font-size: 0.95rem;
}

.specs-table td:first-child {
  width: 28%;
  color: #1f3f43;
  font-weight: 700;
}

.table-note {
  margin: 0;
  padding: 14px 16px 18px;
  color: var(--muted);
  font-size: 0.9rem;
  background: var(--surface-soft);
}

.contact-section {
  background:
    radial-gradient(circle at 0 10%, rgba(13, 122, 116, 0.2), transparent 36%),
    linear-gradient(160deg, #f8fdfc 0%, #eef5f3 100%);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
  align-items: start;
}

.contact-copy p {
  color: var(--muted);
}

.contact-card {
  padding: 24px;
}

.contact-card ul {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.contact-card a {
  color: var(--brand-deep);
  font-weight: 700;
}

.site-footer {
  border-top: 1px solid rgba(13, 122, 116, 0.12);
  padding: 18px 0 26px;
  background: rgba(255, 255, 255, 0.75);
}

.footer-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: #345054;
  font-size: 0.95rem;
}

.footer-wrap p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 {
  transition-delay: 0.12s;
}

.delay-2 {
  transition-delay: 0.22s;
}

@media (max-width: 980px) {
  .hero-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding-top: 42px;
  }
}

@media (max-width: 760px) {
  .section {
    padding: 66px 0;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .main-nav {
    position: absolute;
    top: 72px;
    right: 1.1rem;
    left: 1.1rem;
    display: none;
    flex-direction: column;
    gap: 12px;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

  .main-nav.is-open {
    display: flex;
  }

  .feature-grid,
  .cases-grid {
    grid-template-columns: 1fr;
  }

  .specs-table th,
  .specs-table td {
    padding: 12px;
    font-size: 0.92rem;
  }

  .footer-wrap {
    flex-direction: column;
    align-items: flex-start;
  }
}