/* ── Copilot panel ─────────────────────────────────────────────────────────── */

app-copilot {
  display: flex;
  flex-direction: column;
  position: relative;
  width: var(--copilot-width);
  height: 100%;
  border-left: 1px solid var(--toolbar-border);
  background: var(--copilot-bg);
  flex-shrink: 0;
}

app-copilot.collapsed {
  width: 0;
  min-width: 0;
  border: none;
  overflow: hidden;
}

.copilot-resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  cursor: col-resize;
  z-index: 20;
  transition: background 0.15s;
}

.copilot-resize-handle:hover,
.copilot-resize-handle:active {
  background: rgba(99, 102, 241, 0.35);
}

.copilot-expand-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  flex: 1;
  background: transparent;
  border: none;
  cursor: pointer;
  color: #6366f1;
  font-size: 1.1rem;
  writing-mode: vertical-rl;
  padding: 1rem 0;
}

.copilot-expand-btn:hover {
  background: var(--sidebar-hover);
}

.copilot-collapse-btn {
  flex-shrink: 0;
  padding: 0.2rem 0.4rem;
  line-height: 1;
}

.copilot-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--toolbar-border);
  font-weight: 600;
  font-size: 0.875rem;
  flex-shrink: 0;
}

.copilot-header i {
  font-size: 1rem;
  color: #6366f1;
}

/* ── Tabs (General + project chats) ─────────────────────────────────────────── */
.copilot-tabs {
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 0 0.5rem;
  border-bottom: 1px solid var(--toolbar-border);
  overflow-x: auto;
  flex-shrink: 0;
}

.copilot-tab {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  max-width: 160px;
  padding: 0.4rem 0.6rem;
  font-size: 0.78rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  color: var(--bs-secondary-color, #6c757d);
  white-space: nowrap;
}

.copilot-tab:hover {
  background: var(--toolbar-border);
}

.copilot-tab--active {
  color: var(--bs-body-color, inherit);
  border-bottom-color: #6366f1;
  font-weight: 600;
}

.copilot-tab-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

.copilot-tab-close {
  border: none;
  background: none;
  padding: 0;
  line-height: 1;
  cursor: pointer;
  color: inherit;
  opacity: 0.6;
  flex-shrink: 0;
}

.copilot-tab-close:hover {
  opacity: 1;
}