* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
}

body {
  font-family: var(--font-sans);
  background: transparent;
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--bg-app);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

/* 顶部无边框拖拽标题栏 (与标签栏合二为一) */
.titlebar {
  height: var(--titlebar-height);
  background: var(--bg-titlebar);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  -webkit-app-region: drag; /* 允许窗口拖拽 */
  position: relative;
  z-index: 100;
  padding: 0;
  padding-right: 8px;
  box-sizing: border-box;
}

.titlebar-left {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 8px;
  width: var(--sidebar-width, 250px);
  min-width: var(--sidebar-width, 250px);
  max-width: var(--sidebar-width, 250px);
  border-right: 1px solid var(--border-color);
  -webkit-app-region: no-drag;
  overflow: hidden;
  box-sizing: border-box;
  flex-shrink: 0;
  transition: width 0.22s cubic-bezier(0.4, 0, 0.2, 1),
              min-width 0.22s cubic-bezier(0.4, 0, 0.2, 1),
              max-width 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

#app.sidebar-collapsed .titlebar-left,
.titlebar-left.sidebar-collapsed {
  width: auto;
  min-width: 0;
  max-width: none;
  border-right: none;
  padding: 0 8px;
}

.app-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-color);
  padding: 0 4px;
  letter-spacing: 0.5px;
  -webkit-app-region: drag;
  cursor: grab;
  flex-shrink: 0;
}

/* 顶部标题栏工作区标识 */
.titlebar-workspace-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  height: 22px;
  background: var(--bg-tab-inactive);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  user-select: none;
  -webkit-app-region: no-drag !important;
  transition: all 0.15s ease;
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
}

.titlebar-workspace-tag:hover {
  background: var(--bg-tab-hover);
  color: var(--text-main);
  border-color: var(--border-active);
}

.ws-tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-color);
  box-shadow: 0 0 6px var(--accent-glow);
  flex-shrink: 0;
}

.ws-tag-name {
  font-weight: 500;
  max-width: 95px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 标签页栏容器 (位于顶栏中央，工作区展开时与终端左侧像素对齐) */
.tab-bar-container {
  display: flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  max-width: calc(100vw - 360px);
  padding: 0;
  height: 100%;
  -webkit-app-region: no-drag !important;
  box-sizing: border-box;
}

.titlebar-drag-spacer {
  flex: 1;
  height: 100%;
  -webkit-app-region: drag; /* 中间大面积空白区域允许拖拽 */
  cursor: grab;
  min-width: 20px;
}

.app-brand-icon {
  width: 14px;
  height: 14px;
}

.titlebar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  -webkit-app-region: no-drag;
}

.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  -webkit-app-region: no-drag !important;
  flex-shrink: 0;
}

.btn-icon svg,
.btn-icon svg * {
  pointer-events: none !important;
}

.btn-icon:hover {
  background: var(--btn-hover, rgba(255, 255, 255, 0.08));
  color: var(--text-bright);
}

.btn-icon:active {
  transform: scale(0.95);
}

/* 窗口控制按钮 (最小化、最大化、关闭) */
.window-controls {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: 6px;
  -webkit-app-region: no-drag !important;
}

.win-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 28px;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  -webkit-app-region: no-drag !important;
}

.win-btn svg,
.win-btn svg * {
  pointer-events: none !important;
}

.win-btn:hover {
  background: var(--btn-hover, rgba(255, 255, 255, 0.08));
  color: var(--text-bright);
}

.win-btn.close:hover {
  background: #f7768e;
  color: #ffffff;
}

/* 主内容区终端视口 */
.main-viewport {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
  background: transparent;
}