* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  background-color: #121212;
  color: #eeeeee;
  font-family: "Microsoft YaHei", system-ui, sans-serif;
  padding: 32px;
  line-height: 1.7;
}
h2 {
  font-size: 28px;
  margin-bottom: 24px;
  color: #ffffff;
  font-weight: 600;
}
.tree-item {
  margin-bottom: 16px;
}
.tree-toggle {
  cursor: pointer;
  font-size: 18px;
  padding: 8px 10px;
  border-radius: 6px;
  transition: background 0.2s;
}
.tree-toggle:hover {
  background-color: #272727;
}
.tree-children {
  padding-left: 28px;
  margin-top: 6px;
}
.file-item {
  margin: 6px 0;
  padding: 6px 8px;
  border-radius: 5px;
  transition: background 0.2s;
}
.file-item:hover {
  background-color: #222831;
}
a {
  color: #74b9ff;
  text-decoration: none;
}
a:hover {
  color: #00ccff;
  text-decoration: underline;
}
.back-link {
  display: inline-block;
  margin-top:12px;
  font-size:16px;
}