.sidebar {
  width: 220px;
  min-width: 220px;
  max-width: 500px;
  background: var(--wt-sidebar-bg);
  border-right: 1px solid var(--wt-tab-border);
  display: flex;
  flex-direction: column;
  transition: width 0.2s ease, min-width 0.2s ease;
  user-select: none;
  position: relative;
}
.sidebar.collapsed {
  width: 40px;
  min-width: 40px;
  max-width: 40px;
}
.sidebar-resizer {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  cursor: col-resize;
  z-index: 10;
  transition: background 0.15s;
}
.sidebar-resizer:hover,
.sidebar-resizing .sidebar-resizer {
  background: var(--wt-accent);
}
body[data-theme="dark"] .sidebar-resizer:hover,
body[data-theme="dark"] .sidebar-resizing .sidebar-resizer {
  background: var(--wt-accent);
}
.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .sidebar-section-title,
.sidebar.collapsed .sidebar-item-label,
.sidebar.collapsed .sidebar-item-cmd,
.sidebar.collapsed .sidebar-item-time {
  display: none;
}
.sidebar.collapsed .sidebar-item {
  justify-content: center;
  padding-left: 0;
  padding-right: 0;
}
.sidebar.collapsed .sidebar-item-icon {
  margin: 0;
}
.sidebar.collapsed .sidebar-item-text {
  display: none;
}
.sidebar.collapsed #sidebar-history .sidebar-item {
  display: none;
}
.sidebar-header {
  height: 32px;
  display: flex;
  align-items: center;
  padding: 0 8px;
  border-bottom: 1px solid var(--wt-tab-border);
  gap: 8px;
}
.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  background: transparent;
  color: var(--wt-tab-text-muted);
  cursor: pointer;
  border-radius: 3px;
  transition: background 0.1s, color 0.1s;
}
.sidebar-toggle:hover {
  background: var(--wt-tab-hover-bg);
  color: var(--wt-tab-text);
}
.sidebar-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--wt-tab-text);
}
.sidebar-content {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: 0;
  scrollbar-width: none;
}
.sidebar-content::-webkit-scrollbar { display: none; }
.sidebar-section-title {
  font-size: 11px;
  color: var(--wt-tab-text-muted);
  text-transform: uppercase;
  padding: 12px 12px 6px;
  flex-shrink: 0;
}
.sidebar-list {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  scrollbar-width: none;
}
.sidebar-list::-webkit-scrollbar { display: none; }
.sidebar-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 12px;
  color: var(--wt-tab-text);
  transition: background 0.1s;
}
.sidebar-item:hover { background: var(--wt-tab-hover-bg); }
.sidebar-item.active {
  background: var(--wt-tab-selected-bg);
  position: relative;
}
.sidebar-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: var(--wt-accent);
  border-radius: 0 2px 2px 0;
}
.sidebar-item-icon {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.sidebar-item-icon.running { background: var(--wt-success); }
.sidebar-item-icon.ended { background: #a0a1a7; }
.sidebar-item-initial {
  display: none;
  flex-shrink: 0;
}
.sidebar-item-text { min-width: 0; flex: 1; }
.sidebar-item.flip-move {
  transition: transform 0.25s ease, opacity 0.25s ease;
  z-index: 1;
}
.sidebar-item.ending {
  opacity: 0.7;
}
.sidebar-item-label { font-weight: 600; }
.sidebar-item-cmd {
  color: var(--wt-tab-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sidebar-item-time {
  color: var(--wt-tab-text-muted);
  font-size: 11px;
  opacity: 0.8;
  margin-top: 2px;
}
.sidebar.collapsed .sidebar-item-time {
  display: none;
}

/* ── 侧边栏底部栏（设置按钮） ── */
.sidebar-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--wt-tab-border);
  padding: 6px 8px;
}
/*
 * sidebar 展开时隐藏底部设置按钮，空间留给历史会话列表；
 * 收起时显示设置图标入口（用户需收起 sidebar 才能点击进入设置）。
 */
.sidebar:not(.collapsed) .sidebar-footer {
  display: none;
}
.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 8px;
  border: none;
  background: transparent;
  color: var(--wt-tab-text-muted);
  font-family: var(--wt-font-ui);
  font-size: 12px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.1s, color 0.1s;
}
@media (hover: hover) {
  .sidebar-footer-btn:hover {
    background: var(--wt-tab-hover-bg);
    color: var(--wt-tab-text);
  }
}
.sidebar-footer-btn.active {
  background: var(--wt-tab-selected-bg);
  color: var(--wt-accent);
}
/* 收起状态：仅显示图标，居中 */
.sidebar.collapsed .sidebar-footer-btn {
  justify-content: center;
  padding: 7px 0;
}
.sidebar.collapsed .sidebar-footer-label {
  display: none;
}