:root {
  --bg: #f5f8fc;
  --surface: #ffffff;
  --surface-soft: #f8fbff;
  --text: #17324d;
  --text-soft: #5c7188;
  --line: #d9e4ef;
  --primary: #1664c0;
  --primary-deep: #0e4d99;
  --accent: #eaf3ff;
  --shadow: 0 20px 45px rgba(18, 52, 86, 0.08);
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --container: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(22, 100, 192, 0.08), transparent 24%),
    linear-gradient(180deg, #f7fbff 0%, #f3f7fc 100%);
  line-height: 1.7;
}

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

img {
  max-width: 100%;
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(217, 228, 239, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), #3d89e0);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.08em;
  box-shadow: 0 12px 24px rgba(22, 100, 192, 0.24);
}

.brand-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav a {
  font-size: 0.95rem;
  color: var(--text-soft);
  transition: color 0.2s ease;
}

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

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
  border-radius: 999px;
}

.hero {
  padding: 88px 0 72px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  align-items: center;
  gap: 36px;
}

.eyebrow,
.section-tag {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.hero-desc {
  max-width: 640px;
  margin: 20px 0 0;
  font-size: 1.05rem;
  color: var(--text-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), #2a79d4);
  box-shadow: 0 14px 28px rgba(22, 100, 192, 0.22);
}

.btn-secondary {
  color: var(--primary);
  background: #fff;
  border: 1px solid rgba(22, 100, 192, 0.18);
}

.hero-panel {
  position: relative;
}

.panel-card {
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
  border: 1px solid rgba(217, 228, 239, 0.95);
  border-radius: 24px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panel-top {
  display: flex;
  gap: 8px;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(217, 228, 239, 0.85);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #c5d6ea;
}

.panel-body {
  padding: 22px;
}

.metric + .metric {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(217, 228, 239, 0.75);
}

.metric-label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.metric strong {
  font-size: 1rem;
  font-weight: 600;
}

.section {
  padding: 72px 0;
}

.section-muted {
  background: rgba(255, 255, 255, 0.7);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
  line-height: 1.28;
}

.intro-card,
.info-card,
.contact-item {
  background: var(--surface);
  border: 1px solid rgba(217, 228, 239, 0.95);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.intro-card {
  padding: 28px;
  font-size: 1.03rem;
  color: var(--text-soft);
}

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

.info-card {
  padding: 26px 24px;
  background:
    linear-gradient(180deg, #ffffff 0%, #f9fbfe 100%);
}

.info-card h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.info-card p {
  margin: 0;
  color: var(--text-soft);
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.scenario-item {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(217, 228, 239, 0.95);
  background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%);
  color: var(--text);
  font-weight: 600;
  text-align: center;
}

.section-contact {
  padding-bottom: 88px;
}

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

.contact-item {
  padding: 24px;
}

.contact-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.site-footer {
  border-top: 1px solid rgba(217, 228, 239, 0.85);
  background: #fff;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 22px 0;
  color: var(--text-soft);
  font-size: 0.94rem;
}

.beian {
  text-align: right;
}

@media (max-width: 900px) {
  .hero {
    padding-top: 64px;
  }

  .hero-grid,
  .card-grid,
  .scenario-grid,
  .contact-grid,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    display: grid;
  }

  .beian {
    text-align: left;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
  }

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

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

@media (max-width: 640px) {
  .container {
    width: min(var(--container), calc(100% - 28px));
  }

  .header-inner {
    min-height: 68px;
  }

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

  .intro-card,
  .info-card,
  .contact-item,
  .panel-body {
    padding: 20px;
  }

  .btn {
    width: 100%;
  }

  .brand-text {
    font-size: 0.95rem;
  }
}