#folderModal {
  display: none;
  position: fixed;
  z-index: 99999;
  left: 0; top: 0;
  width: 100vw; height: 100vh;
  background: rgba(20, 30, 48, 0.97);
  align-items: center;
  justify-content: center;
}
#folderModal.show {
  display: flex;
}
#folderModal .modal-content {
  background: #202c3a;
  border-radius: 16px;
  box-shadow: 0 8px 40px #141e3080;
  min-width: 500px;
  max-width: 900px;
  max-height: 80vh;
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}
.popup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1em 1.5em;
  background: #25344a;
  border-radius: 16px 16px 0 0;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 8px rgba(36,59,85,0.06);
}
.popup-header .btn {
  background: #00b894;
  color: white;
  border: none;
  border-radius: 7px;
  padding: 0.5em 1.2em;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
  margin-right: 1em;
}
.popup-header .btn:hover {
  background: #00e676;
}
.popup-header .close {
  background: none;
  border: none;
  font-size: 1.8em;
  color: #90caf9;
  cursor: pointer;
  transition: color 0.2s;
  margin: 0;
}
.popup-header .close:hover {
  color: #fbc02d;
}
#folderTree {
  overflow-y: auto;
  max-height: calc(80vh - 60px);
  padding: 1em 1.5em;
}
.category-tree,
.folder-children {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
.folder-node {
  display: flex;
  flex-direction: column;
  margin-bottom: 2px;
}
.folder-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 10px 10px 12px;
  background: #25344a;
  border-radius: 7px;
  cursor: pointer;
  margin-bottom: 3px;
  transition: background 0.18s, box-shadow 0.18s;
  box-shadow: 0 2px 8px rgba(36,59,85,0.06);
}
.folder-header:hover {
  background: #2e3d54;
}
.folder-toggle {
  margin-right: 6px;
  background: none;
  border: none;
  color: #90caf9;
  cursor: pointer;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}
.folder-name {
  font-weight: 600;
  color: #90caf9;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 1.08em;
}
.folder-children {
  padding-left: 16px;
  margin-top: 2px;
}
.folder-children.collapsed {
  display: none;
}
.category-node {
  background: #25344a;
  border-radius: 7px;
  padding: 10px 10px 10px 16px;
  color: #e3eaf5;
  font-size: 1.07em;
  box-shadow: 0 2px 8px rgba(36,59,85,0.07);
  cursor: pointer;
  margin-bottom: 3px;
  position: relative;
  transition: background 0.18s, color 0.18s;
  align-items: center;
  display: flex;
}
.category-node.selected {
  background: #1976d2;
  color: #fff;
}
.category-node:hover {
  background: #1c2533;
  color: #fff;
  box-shadow: 0 4px 16px rgba(36,59,85,0.13);
}
.category-name {
  flex-grow: 1;
  user-select: none;
  font-weight: 500;
  text-align: left;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (max-width: 700px) {
  #folderModal .modal-content { min-width: 0; max-width: 98vw; }
}