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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: #333;
  background: #f5f5f5;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: linear-gradient(135deg, #2c5282 0%, #1a365d 100%);
  color: #fff;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: #fff;
  text-decoration: none;
  transition: color 0.3s;
  font-weight: 500;
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 1px;
}

.nav-links a:hover {
  color: #ffa500;
}

.hero {
  background: linear-gradient(135deg, #4299e1 0%, #2c5282 100%);
  color: #fff;
  padding: 5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(255,255,255,0.05) 10px,
    rgba(255,255,255,0.05) 20px
  );
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 3px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
  font-size: 1.3rem;
  margin-bottom: 2rem;
  color: #fff;
  font-weight: 600;
}

.btn {
  display: inline-block;
  padding: 15px 40px;
  background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
  color: white;
  text-decoration: none;
  border-radius: 5px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 4px 15px rgba(237,137,54,0.3);
}

.btn:hover {
  background: linear-gradient(135deg, #dd6b20 0%, #c05621 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(237,137,54,0.4);
}

.section {
  padding: 4rem 0;
  background: #fff;
}

.section:nth-child(even) {
  background: #f7fafc;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: #2d3748;
  text-transform: uppercase;
  letter-spacing: 2px;
  position: relative;
  padding-bottom: 1rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, transparent, #ed8936, transparent);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.product-card {
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s;
  border: 1px solid #e2e8f0;
  position: relative;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #ed8936, #dd6b20);
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.product-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  background: linear-gradient(135deg, #edf2f7 0%, #e2e8f0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: #ed8936;
}

.product-info {
  padding: 2rem;
}

.product-info h3 {
  margin-bottom: 1rem;
  color: #2d3748;
  font-size: 1.3rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.product-power {
  color: #ed8936;
  font-weight: bold;
  font-size: 1.5rem;
  margin: 1rem 0;
}

.features {
  background: #f7fafc;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.feature-item {
  text-align: center;
  padding: 2rem;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  transition: all 0.3s;
}

.feature-item:hover {
  border-color: #ed8936;
  box-shadow: 0 4px 20px rgba(237,137,54,0.2);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: #ed8936;
}

.feature-item h3 {
  color: #2d3748;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.feature-item p {
  color: #718096;
}

.contact-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  display: none;
}

.contact-float.mobile {
  display: block;
}

.phone-btn {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.8rem;
  box-shadow: 0 4px 20px rgba(237,137,54,0.5);
  text-decoration: none;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 4px 20px rgba(237,137,54,0.5);
  }
  50% {
    box-shadow: 0 4px 30px rgba(237,137,54,0.8);
  }
}

.wechat-section {
  text-align: center;
  padding: 3rem;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  margin: 2rem 0;
}

.wechat-qr {
  width: 200px;
  height: 200px;
  background: #f7fafc;
  margin: 1rem auto;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: #718096;
  border: 2px dashed #cbd5e0;
  border-radius: 10px;
}

footer {
  background: #2d3748;
  color: #cbd5e0;
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
  color: #ed8936;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.footer-section ul {
  list-style: none;
}

.footer-section a {
  color: #cbd5e0;
  text-decoration: none;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: #ed8936;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #4a5568;
  color: #a0aec0;
}

.city-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.city-link {
  background: #fff;
  padding: 1rem;
  text-align: center;
  border: 1px solid #e2e8f0;
  border-radius: 5px;
  transition: all 0.3s;
}

.city-link:hover {
  border-color: #ed8936;
  box-shadow: 0 4px 15px rgba(237,137,54,0.2);
}

.city-link a {
  color: #2d3748;
  text-decoration: none;
  font-weight: 600;
}

@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
    font-size: 0.8rem;
  }

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

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

  .contact-float {
    display: block;
  }
}