* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: #1f2937;
  background: #ffffff;
  line-height: 1.7;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

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

.nav-container {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 24px;
}

.nav a {
  color: #374151;
  font-size: 15px;
}

.menu-button {
  display: none;
  border: 1px solid #d1d5db;
  background: #ffffff;
  border-radius: 8px;
  padding: 6px 12px;
}

.section {
  padding: 80px 0;
}

.hero {
  min-height: 520px;
  display: flex;
  align-items: center;
}

.eyebrow {
  color: #2563eb;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 0 0 20px;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.1;
}

h2 {
  margin: 0 0 20px;
  font-size: 32px;
}

h3 {
  margin-top: 0;
}

.hero-text {
  max-width: 640px;
  font-size: 18px;
  color: #4b5563;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 700;
}

.button.primary {
  background: #2563eb;
  color: #ffffff;
}

.button.secondary {
  border: 1px solid #d1d5db;
  color: #1f2937;
}

.light {
  background: #f9fafb;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.contact-list {
  padding-left: 20px;
}

.site-footer {
  border-top: 1px solid #e5e7eb;
  padding: 28px 0;
  color: #6b7280;
}

/* 手机端适配 */
@media (max-width: 768px) {
  .menu-button {
    display: block;
  }

  .nav {
    display: none;
    position: absolute;
    top: 64px;
    right: 4%;
    width: 180px;
    padding: 12px;
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
    flex-direction: column;
    gap: 10px;
  }

  .nav.open {
    display: flex;
  }

  .hero {
    min-height: auto;
  }

  .section {
    padding: 56px 0;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }
}