* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: #1f2937;
  background: #f7f9fc;
}

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

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #e5e7eb;
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.22);
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
}

.brand-subtitle {
  margin-top: 2px;
  font-size: 12px;
  color: #6b7280;
}

nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  color: #4b5563;
}

nav a:hover {
  color: #2563eb;
}

.hero {
  padding: 86px 0 72px;
  background:
    radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.14), transparent 30%),
    radial-gradient(circle at 80% 10%, rgba(14, 165, 233, 0.18), transparent 34%),
    linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 42px;
  align-items: center;
}

.tag {
  display: inline-flex;
  padding: 8px 14px;
  margin: 0 0 18px;
  color: #1d4ed8;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.05;
  letter-spacing: -2px;
  color: #111827;
}

.desc {
  max-width: 720px;
  margin: 24px 0 0;
  font-size: 18px;
  line-height: 1.9;
  color: #4b5563;
}

.actions {
  display: flex;
  gap: 14px;
  margin-top: 34px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 120px;
  padding: 12px 20px;
  border-radius: 12px;
  border: 1px solid #d1d5db;
  background: #fff;
  color: #374151;
  font-weight: 600;
  transition: transform .2s ease, box-shadow .2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.1);
}

.btn.primary {
  border-color: #2563eb;
  background: #2563eb;
  color: #fff;
}

.hero-card {
  position: relative;
  padding: 28px;
  border-radius: 24px;
  background: #fff;
  border: 1px solid #e5e7eb;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 8px rgba(34, 197, 94, 0.12);
}

.hero-card h2 {
  margin: 22px 0 10px;
}

.hero-card p {
  color: #4b5563;
  line-height: 1.8;
}

.hero-card ul {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.hero-card li {
  padding: 10px 0;
  border-top: 1px solid #f1f5f9;
  color: #374151;
}

.section {
  padding: 72px 0;
  background: #fff;
}

.section.light {
  background: #f7f9fc;
}

.section h2 {
  margin: 0 0 22px;
  font-size: 30px;
  color: #111827;
}

.section p {
  max-width: 920px;
  margin: 0 0 14px;
  line-height: 2;
  color: #4b5563;
  font-size: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.card {
  min-height: 170px;
  padding: 26px;
  border-radius: 20px;
  background: #fff;
  border: 1px solid #e5e7eb;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.05);
}

.card h3 {
  margin: 0 0 12px;
  color: #1d4ed8;
}

.card p {
  margin: 0;
  line-height: 1.8;
}

.site-footer {
  padding: 28px 0;
  background: #111827;
  color: #cbd5e1;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
}

.site-footer a {
  color: #dbeafe;
}

.site-footer a:hover {
  color: #fff;
}

@media (max-width: 800px) {
  .nav {
    height: auto;
    padding: 16px 0;
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero {
    padding: 52px 0;
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .grid {
    grid-template-columns: 1fr;
  }

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