.server-file-menu {
  position: fixed;
  z-index: 100000;
  min-width: 250px;
  padding: 5px 0;
  border: 1px solid #aaa;
  border-radius: 3px;
  background: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .28);
  color: #222;
  font: 13px Arial, sans-serif;
}
.server-file-menu[hidden] { display: none; }
.server-file-menu button {
  display: block;
  width: 100%;
  padding: 7px 22px;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}
.server-file-menu button:hover,
.server-file-menu button:focus { background: #d9e8fb; outline: 0; }
.server-file-menu .server-file-status { color: #666; cursor: default; }
.server-file-menu .server-file-note {
  margin-top: 4px;
  padding: 7px 12px 3px;
  border-top: 1px solid #ddd;
  color: #777;
  font-size: 11px;
}
.server-file-group { position: relative; }
.server-file-menu .server-file-group-button::after {
  content: "▶";
  float: right;
  margin-left: 18px;
  color: #666;
  font-size: 10px;
}
.server-file-submenu {
  position: absolute;
  top: -6px;
  left: 100%;
  z-index: 1;
  min-width: 270px;
  max-height: min(80vh, 620px);
  overflow-y: auto;
  padding: 5px 0;
  border: 1px solid #aaa;
  border-radius: 3px;
  background: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, .28);
}
.server-file-submenu[hidden] { display: none; }
.server-file-trigger { white-space: nowrap; }