body {
  font-family: 'Noto Sans SC', sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
}
.language-switch {
  transition: all 0.3s ease;
}
.language-switch:hover {
  transform: scale(1.1);
}
.particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
.nav-item {
  position: relative;
}
.nav-item::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: #3b82f6;
  transition: width 0.3s ease;
}
.nav-item:hover::after {
  width: 100%;
}
.product-card {
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.fade-in {
  animation: fadeIn 0.5s ease forwards;
}