.collaboration-panel {
  position: fixed;
  z-index: 80;
  top: 44px;
  right: 10px;
  width: min(430px, calc(100vw - 20px));
  max-height: calc(100vh - 62px);
  display: flex;
  flex-direction: column;
  color: #17211b;
  background: #fff;
  border: 1px solid #b8c5bd;
  border-radius: 8px;
  box-shadow: 0 14px 42px rgba(22, 45, 31, .22);
  font: 13px/1.4 "Segoe UI", "Microsoft YaHei", sans-serif;
}
.collaboration-panel[hidden] { display: none; }
.collab-head,
.collab-row,
.collab-tabs,
.collab-actions { display: flex; align-items: center; gap: 8px; }
.collab-head { padding: 11px 12px; border-bottom: 1px solid #e0e7e2; }
.collab-head strong { flex: 1; font-size: 15px; }
.collab-head button,
.collab-tabs button,
.collab-panel-body button,
.collab-panel-body select,
.collab-panel-body input,
.collab-panel-body textarea {
  min-height: 30px;
  border: 1px solid #b6c3ba;
  border-radius: 4px;
  background: #fff;
  color: inherit;
  padding: 4px 8px;
  font: inherit;
}
.collab-head button { min-width: 30px; padding: 0; font-size: 18px; }
.collab-tabs { padding: 8px 10px 0; border-bottom: 1px solid #e0e7e2; }
.collab-tabs button { border: 0; border-radius: 4px 4px 0 0; color: #526159; }
.collab-tabs button.active { color: #107c41; background: #e9f5ee; font-weight: 600; }
.collab-panel-body { overflow: auto; padding: 10px 12px 14px; }
.collab-section { margin-bottom: 14px; }
.collab-section h4 { margin: 0 0 7px; font-size: 13px; }
.collab-muted { color: #6a756e; font-size: 12px; }
.collab-status-dot {
  width: 9px; height: 9px; border-radius: 50%; background: #9b9b9b; flex: 0 0 auto;
}
.collab-status-dot.online { background: #21a366; box-shadow: 0 0 0 3px rgba(33,163,102,.14); }
.collab-person,
.collab-change,
.collab-version {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 8px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid #edf1ee;
}
.collab-version-actions { display: inline-flex; gap: 5px; }
.collab-avatar { width: 24px; height: 24px; border-radius: 50%; color: #fff; display: grid; place-items: center; font-weight: 700; }
.collab-person small,
.collab-change small,
.collab-version small { display: block; color: #6a756e; }
.collab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.collab-grid .wide { grid-column: 1 / -1; }
.collab-panel-body button.primary { border-color: #107c41; background: #107c41; color: #fff; }
.collab-panel-body button:disabled { opacity: .55; cursor: not-allowed; }
.collab-empty { padding: 14px 4px; color: #6a756e; text-align: center; }
.collab-conflict {
  padding: 9px; margin-bottom: 9px; border-left: 3px solid #c4314b; background: #fff2f4; color: #8a1538;
}
.collab-remote-selection,
.collab-remote-cursor {
  position: absolute;
  pointer-events: none;
  box-sizing: border-box;
  z-index: 4;
}
.collab-remote-selection { border: 2px solid var(--collab-color); background: color-mix(in srgb, var(--collab-color) 10%, transparent); }
.collab-remote-cursor { border: 2px solid var(--collab-color); }
.collab-remote-label {
  position: absolute;
  left: -2px;
  top: -22px;
  max-width: 180px;
  padding: 2px 6px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  border-radius: 3px 3px 3px 0;
  background: var(--collab-color);
  color: #fff;
  font: 11px/18px "Segoe UI", sans-serif;
}
@media (max-width: 720px) {
  .collaboration-panel { top: 8px; right: 8px; width: calc(100vw - 16px); max-height: calc(100vh - 16px); }
}