body.ui-style-10 {
  font-family: "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

main {
  min-height: calc(100vh - 200px);
  padding: 1rem;
}

.active {
  font-weight: bold;
  text-decoration: underline !important;
}

@media (max-width: 768px) {
  main { padding: 0.5rem; }
  h1 { font-size: 1.5rem !important; }
  h2 { font-size: 1.2rem !important; }
  table { font-size: 0.9rem; }
}

button.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #0066cc;
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
  z-index: 1000;
}

button.back-to-top.show {
  display: block;
}