:root {
  --bg: #f4f6f8;
  --bg-strong: #eef2f5;
  --surface: rgba(255, 255, 255, 0.9);
  --surface-solid: #ffffff;
  --text: #1f2a37;
  --text-soft: #526070;
  --line: rgba(31, 42, 55, 0.12);
  --accent: #1d6fa5;
  --accent-strong: #15567f;
  --accent-soft: rgba(29, 111, 165, 0.12);
  --shadow: 0 18px 45px rgba(31, 42, 55, 0.08);
  --shadow-soft: 0 10px 28px rgba(31, 42, 55, 0.05);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --container: min(1120px, calc(100vw - 32px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(29, 111, 165, 0.12), transparent 32%),
    radial-gradient(circle at top right, rgba(31, 42, 55, 0.08), transparent 28%),
    linear-gradient(180deg, #fbfcfd 0%, var(--bg) 100%);
  line-height: 1.7;
}

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

img,
svg {
  display: block;
}

button,
a {
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-color 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease;
}

:focus-visible {
  outline: 3px solid rgba(29, 111, 165, 0.35);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--surface-solid);
  box-shadow: var(--shadow-soft);
  z-index: 1000;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 99;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(31, 42, 55, 0.08);
  box-shadow: 0 8px 30px rgba(31, 42, 55, 0.05);
}

.header-shell {
  width: var(--container);
  margin: 0 auto;
  padding: 18px 0 16px;
}

.brand-block {
  text-align: center;
  margin-bottom: 12px;
}

.brand-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  letter-spacing: 0.08em;
  font-weight: 700;
}

.brand-tagline {
  margin: 6px 0 0;
  font-size: 0.98rem;
  color: var(--text-soft);
}

.site-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding: 0;
  margin: 0;
}

.site-nav a {
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--text-soft);
  font-weight: 600;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.page-shell {
  width: var(--container);
  margin: 0 auto;
  padding: 44px 0 72px;
}

.hero-intro,
.content-card,
.product-card,
.feature-item,
.footer-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
}

.hero-intro {
  border-radius: calc(var(--radius-xl) + 4px);
  padding: clamp(28px, 5vw, 44px);
  position: relative;
  overflow: hidden;
}

.hero-intro::after {
  content: "";
  position: absolute;
  inset: auto -40px -50px auto;
  width: 180px;
  height: 180px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(29, 111, 165, 0.15), transparent 68%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(29, 111, 165, 0.14);
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 700;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
  margin-top: 18px;
}

.hero-copy h2,
.section-heading,
.page-title,
.product-card h3,
.feature-item h3,
.content-card h3 {
  margin: 0;
}

.hero-copy h2 {
  font-size: clamp(2rem, 4.2vw, 3.25rem);
  line-height: 1.2;
}

.hero-copy p,
.page-lead,
.section-lead,
.product-card p,
.feature-item p,
.content-card p,
.content-card li,
.footer-note {
  color: var(--text-soft);
  font-size: 1rem;
}

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

.stat-card {
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(31, 42, 55, 0.08);
}

.stat-card strong {
  display: block;
  font-size: 1.7rem;
  color: var(--accent);
}

.section {
  margin-top: 32px;
}

.section-heading-wrap {
  text-align: center;
  margin-bottom: 20px;
}

.section-heading {
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  margin-bottom: 12px;
}

.section-lead {
  max-width: 760px;
  margin: 0 auto;
}

.product-grid,
.feature-grid,
.card-grid {
  display: grid;
  gap: 22px;
}

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

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

.card-grid.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.product-card,
.content-card,
.feature-item {
  border-radius: var(--radius-xl);
  padding: 28px;
  position: relative;
}

.product-card {
  min-height: 100%;
}

.product-card:hover,
.content-card:hover,
.feature-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card-icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 18px;
}

.card-icon svg {
  width: 28px;
  height: 28px;
}

.product-card h3,
.content-card h3 {
  font-size: 1.45rem;
  line-height: 1.35;
}

.product-card p {
  margin: 14px 0 0;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
}

.button.primary {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(29, 111, 165, 0.24);
}

.button.primary:hover {
  background: var(--accent-strong);
  transform: translateY(-2px);
}

.button.secondary {
  background: #ffffff;
  color: var(--accent);
  border-color: rgba(29, 111, 165, 0.2);
}

.button.secondary:hover {
  background: var(--accent-soft);
}

.vision-panel {
  text-align: center;
  padding: 32px;
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(244, 246, 248, 0.96));
  border: 1px solid rgba(31, 42, 55, 0.08);
  box-shadow: var(--shadow-soft);
}

.vision-panel blockquote {
  margin: 0;
  font-size: clamp(1.08rem, 2.1vw, 1.24rem);
  color: var(--text);
}

.feature-item h3 {
  font-size: 1.1rem;
  margin-top: 14px;
}

.feature-icon {
  font-size: 1.5rem;
}

.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 12px;
}

.content-card ul {
  padding-left: 1.2rem;
  margin: 16px 0 0;
}

.content-card li + li {
  margin-top: 10px;
}

.cta-banner {
  margin-top: 28px;
  padding: 26px 28px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, rgba(29, 111, 165, 0.12), rgba(255, 255, 255, 0.95));
  border: 1px solid rgba(29, 111, 165, 0.16);
}

.content-card a {
  color: var(--accent);
}

.content-card a:hover {
  color: var(--accent-strong);
}

.qr-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.qr-card {
  margin: 0;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(244, 246, 248, 0.92);
  border: 1px solid rgba(31, 42, 55, 0.08);
  text-align: center;
}

.qr-card img {
  width: 100%;
  height: auto;
  border-radius: 14px;
  background: #ffffff;
}

.qr-card figcaption {
  margin-top: 12px;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.site-footer {
  padding: 0 0 40px;
}

.footer-card {
  width: var(--container);
  margin: 0 auto;
  border-radius: var(--radius-xl);
  padding: 28px;
}

.footer-top {
  display: flex;
  gap: 18px;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  max-width: 520px;
}

.footer-brand strong {
  display: block;
  font-size: 1.18rem;
  margin-bottom: 8px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links a {
  padding: 10px 14px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid rgba(31, 42, 55, 0.08);
  color: var(--text-soft);
}

.footer-links a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 18px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 960px) {
  .hero-grid,
  .product-grid,
  .card-grid.two-col,
  .feature-grid,
  .qr-grid {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .header-shell {
    padding: 16px 0 14px;
  }

  .site-nav ul {
    gap: 8px 10px;
  }

  .site-nav a {
    padding: 8px 12px;
    font-size: 0.95rem;
  }

  .page-shell {
    padding: 30px 0 52px;
  }

  .hero-intro,
  .product-card,
  .content-card,
  .feature-item,
  .footer-card,
  .vision-panel {
    padding: 22px;
  }

  .button-row,
  .footer-links,
  .footer-bottom {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }
}