.ui-style-0 {
  --primary-color: #d32f2f;
  --secondary-color: #1976d2;
  --accent-color: #f57c00;
}

main {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

a {
  transition: color 0.3s ease;
}

a:hover {
  color: var(--primary-color);
}

@media (max-width: 768px) {
  main {
    padding: 20px 15px !important;
  }

  h1 {
    font-size: 24px !important;
  }

  h2 {
    font-size: 20px !important;
  }

  .header-content {
    padding: 10px 15px;
  }

  nav ul {
    gap: 4px !important;
  }

  nav ul li a {
    padding: 6px 4px !important;
    font-size: 12px !important;
  }
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
  z-index: 999;
}

.back-to-top:hover {
  background: #b71c1c;
  transform: translateY(-5px);
}

.back-to-top.show {
  display: flex;
}