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

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.6;
  color: #333;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  font-size: 24px;
  font-weight: bold;
}

.logo-icon {
  font-size: 32px;
  margin-right: 10px;
}

.nav a {
  margin-left: 30px;
  text-decoration: none;
  color: #333;
  font-size: 16px;
}

.nav a:hover {
  color: #667eea;
}

.hero {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  text-align: center;
  padding: 120px 40px;
  color: #fff;
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
}

.hero p {
  font-size: 20px;
  opacity: 0.9;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 20px;
}

.btn-primary {
  background: #fff;
  color: #667eea;
  border: none;
  padding: 15px 40px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: transform 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: #fff;
  border: 2px solid #fff;
  padding: 15px 40px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: transform 0.2s;
}

.btn-secondary:hover {
  transform: translateY(-2px);
}

.features {
  padding: 80px 40px;
  text-align: center;
}

.features h2 {
  font-size: 36px;
  margin-bottom: 40px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.feature-card {
  background: #fff;
  padding: 40px 20px;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 20px;
  margin-bottom: 15px;
}

.feature-card p {
  color: #666;
  font-size: 14px;
}

.pricing {
  padding: 80px 40px;
  background: #f8f9fa;
  text-align: center;
}

.pricing h2 {
  font-size: 36px;
  margin-bottom: 40px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: 1200px;
  margin: 0 auto;
}

.pricing-card {
  background: #fff;
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

.pricing-card.pro {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
}

.pricing-card.pro li {
  color: rgba(255,255,255,0.9);
}

.pricing-card.pro button {
  background: #fff;
  color: #667eea;
}

.pricing-card h3 {
  font-size: 24px;
  margin-bottom: 20px;
}

.price {
  font-size: 48px;
  font-weight: bold;
  margin-bottom: 20px;
}

.price span {
  font-size: 20px;
  font-weight: normal;
}

.pricing-card ul {
  list-style: none;
  text-align: left;
}

.pricing-card li {
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}

.pricing-card li:last-child {
  border-bottom: none;
}

.about {
  padding: 80px 40px;
  text-align: center;
}

.about h2 {
  font-size: 36px;
  margin-bottom: 30px;
}

.about p {
  font-size: 18px;
  color: #666;
  max-width: 800px;
  margin: 0 auto 20px;
}

.footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 30px;
}

@media (max-width: 768px) {
  .header {
    padding: 15px 20px;
  }
  
  .nav {
    display: none;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .feature-grid, .pricing-grid {
    grid-template-columns: 1fr;
  }
}