/* ===== 树形菜单折叠样式 ===== */
.tree-menu {
  width: 238px;
  border: #f1f1f1 1px solid;
  border-top: none;
  background: #ffffff;
}
.tree-menu .sub-items {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.tree-menu.open .sub-items {
  max-height: 500px;
}

/* 标题（机关简介） */
.tree-menu .summary {
  cursor: pointer;
  user-select: none;
  font-size: 15px;
  padding-left: 20px;
  line-height: 32px;
}
.tree-menu .summary::before {
  content: "+";
  display: inline-block;
  transition: transform 0.25s;
  margin-right: 4px;
}
.tree-menu.open .summary::before {
  transform: rotate(90deg);
}

/* 列表项与链接 */
.tree-menu li {
  list-style: none;
}
.tree-menu li a {
  display: block;
  width: 155px;
  padding-left: 40px;
  font-size: 15px;
  line-height: 32px;
  text-decoration: none;
  color: inherit;
}
/* 项目符号（在链接文字前） */
.tree-menu li a::before {
  content: "● ";
  display: inline-block;
  margin-right: 6px;
  color: #555555;
  font-size: 8px;
  vertical-align: middle;
  line-height: 1;
}
/* 当前激活页（领导信息） */
.tree-menu li a.current {
  font-weight: bold;
  color: #2d66a5;
}

/* 子菜单缩进 */
.tree-menu .sub-items {
  margin-left: 15px;
}