* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #eee;
  z-index: 100;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: #2563eb;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  border-radius: 8px;
}

.logo-text {
  font-size: 18px;
  font-weight: 600;
  color: #111;
}

.nav a {
  color: #555;
  text-decoration: none;
  margin-left: 28px;
  font-size: 15px;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
  color: #fff;
  text-align: center;
}

.hero h1 {
  font-size: 42px;
  font-weight: 700;
  margin-bottom: 16px;
}

.hero-sub {
  font-size: 20px;
  opacity: 0.9;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 16px;
  opacity: 0.75;
  max-width: 600px;
  margin: 0 auto 32px;
}

.btn {
  display: inline-block;
  padding: 12px 36px;
  background: #fff;
  color: #2563eb;
  text-decoration: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Services */
.services {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 32px;
  margin-bottom: 12px;
}

.section-desc {
  text-align: center;
  color: #666;
  margin-bottom: 48px;
  font-size: 16px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  padding: 32px 24px;
  background: #f8fafc;
  border-radius: 12px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.service-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: #111;
}

.service-card p {
  font-size: 14px;
  color: #666;
  line-height: 1.7;
}

/* About */
.about {
  padding: 80px 0;
  background: #f8fafc;
}

.about-content {
  max-width: 800px;
  margin: 0 auto 48px;
}

.about-content p {
  font-size: 15px;
  color: #555;
  margin-bottom: 16px;
  text-indent: 2em;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 24px;
}

.stat-num {
  display: block;
  font-size: 36px;
  font-weight: 700;
  color: #2563eb;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: #666;
}

/* Contact */
.contact {
  padding: 80px 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
}

.contact-item {
  padding: 32px 24px;
  background: #f8fafc;
  border-radius: 12px;
}

.contact-item h3 {
  font-size: 16px;
  color: #111;
  margin-bottom: 8px;
}

.contact-item p {
  font-size: 15px;
  color: #555;
}

/* Footer */
.footer {
  padding: 32px 0;
  background: #1a1a1a;
  color: #999;
  text-align: center;
  font-size: 14px;
}

.footer p {
  margin-bottom: 8px;
}

.footer a {
  color: #999;
  text-decoration: none;
}

.footer a:hover {
  color: #ccc;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 28px;
  }

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

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

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

  .nav a {
    margin-left: 16px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  .service-grid {
    grid-template-columns: 1fr;
  }

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