.product-nav {
  background-color: white;
  position: sticky;
  top: 44px;
  z-index: 999;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.product-nav-container {
  display: flex;
  justify-content: center;
  padding: 0;
}

.product-nav-item {
  padding: 20px 30px;
  font-size: 17px;
  font-weight: 500;
  color: #86868b;
  cursor: pointer;
  position: relative;
  transition: color 0.3s;
  border-bottom: 3px solid transparent;
}

.product-nav-item.active {
  color: #007AFF;
  border-bottom-color: #007AFF;
}

.product-nav-item:hover {
  color: #007AFF;
}

.product-section {
  padding: 80px 0;
  display: none;
}

.product-section.active {
  display: block;
  animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.product-header {
  text-align: center;
  margin-bottom: 60px;
}

.product-header h2 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
}

.product-header p {
  font-size: 24px;
  color: #86868b;
  max-width: 800px;
  margin: 0 auto;
}

.features-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 20px;
  margin-bottom: 60px;
}

.feature-card {
  background-color: white;
  border-radius: 18px;
  padding: 30px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s, box-shadow 0.3s;
  height: 100%;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 24px;
  color: white;
}

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 16px;
  font-weight: 600;
}

.feature-card p {
  color: #515154;
  line-height: 1.5;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  padding-left: 0;
}

.feature-list li {
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
  display: flex;
  align-items: center;
}

.feature-list li:last-child {
  border-bottom: none;
}

.feature-list i {
  color: #007AFF;
  margin-right: 10px;
  font-size: 14px;
}

.platform-architecture {
  background-color: white;
  border-radius: 18px;
  padding: 40px;
  margin-top: 60px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.architecture-title {
  font-size: 28px;
  margin-bottom: 30px;
  text-align: center;
  font-weight: 600;
}

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.architecture-item {
  background-color: #f5f5f7;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  transition: transform 0.3s;
}

.architecture-item:hover {
  transform: translateY(-5px);
  background-color: #e8e8ed;
}

.architecture-item i {
  font-size: 32px;
  color: #007AFF;
  margin-bottom: 15px;
}

.architecture-item h4 {
  font-size: 18px;
  margin-bottom: 10px;
}


@media (max-width: 768px) {
  .product-nav-container {
    flex-wrap: wrap;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .product-nav-item {
    padding: 15px 20px;
    font-size: 16px;
    white-space: nowrap;
  }
 .product-header {
    margin-bottom: 20px;
  }
  .product-header h2 {
    font-size: 36px;
  }
 .product-section {
    padding: 20px 0;
  }
  .product-header p {
    font-size: 16px;
  }
  .features-container {
    grid-template-columns: 1fr;
    margin-bottom: 20px;
  }
  .platform-architecture {
    margin-top: 20px;
  }
}

@media (max-width: 480px) {
  .product-header {
    margin-bottom: 20px;
  }
  .product-header h2 {
    font-size: 28px;
  }
  .product-header p {
    font-size: 16px;
  }
  .product-section {
    padding: 20px 0;
  }
  .stat-number {
    font-size: 36px;
  }

  .feature-card {
    padding: 20px;
  }
}