/* src/layout/TabBar.css */

.tab-bar {
  position: relative;
  display: flex;
  align-items: center;
  /* Shared with every sidebar panel header so the bottom border lines up
   * across the entire .app-shell-body. See src/index.css. */
  height: var(--chrome-row-height);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
  flex-shrink: 0;
}

.tab-bar__scroller {
  display: flex;
  align-items: center;
  flex: 1;
  min-width: 0;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  touch-action: pan-x pinch-zoom;
}

.tab-bar__scroll-shadow {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 28px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease-out;
  z-index: 1;
}

.tab-bar__scroll-shadow--left {
  left: 0;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.42), transparent);
}

.tab-bar__scroll-shadow--right {
  right: 0;
  background: linear-gradient(to left, rgba(0, 0, 0, 0.42), transparent);
}

.tab-bar[data-scroll-shadow-left="true"] .tab-bar__scroll-shadow--left {
  opacity: 1;
}

.tab-bar[data-scroll-shadow-right="true"] .tab-bar__scroll-shadow--right {
  opacity: 1;
}

/* Hide scrollbar but keep functionality */
.tab-bar__scroller::-webkit-scrollbar {
  height: 0;
}

.tab-bar__scroller {
  scrollbar-width: none;
}

.tab {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  height: 100%;
  padding: 0 0 0 0.625rem;
  background: none;
  border: none;
  border-right: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  max-width: 224px;
  min-width: 80px;
  transition: color 0.15s, background-color 0.15s;
  user-select: none;
}

.tab[data-dragging="true"] {
  opacity: 0.6;
  z-index: 2;
}

.tab[data-shifting="true"] {
  transition: transform 0.12s ease-out, color 0.15s, background-color 0.15s;
}

@media (prefers-reduced-motion: reduce) {
  .tab[data-shifting="true"] { transition: none; }
}

.tab[data-drop-before="true"]::before,
.tab[data-drop-after="true"]::before {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--accent);
  content: '';
  z-index: 1;
}

.tab[data-drop-before="true"]::before { left: 0; }
.tab[data-drop-after="true"]::before { right: 0; }

.tab:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.tab[aria-selected="true"] {
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

.tab-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: left;
}

.tab-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 100%;
  /* Square — matches the rectilinear chrome. */
  border-radius: 0;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s, background-color 0.15s;
  flex-shrink: 0;
}

.tab:hover .tab-close,
.tab:focus-within .tab-close,
.tab[aria-selected="true"] .tab-close {
  opacity: 1;
}

.tab-close:hover {
  color: var(--text-primary);
  background-color: var(--bg-active);
}

.tab-close:focus-visible {
  opacity: 1;
  outline: 1px solid var(--accent);
  outline-offset: -1px;
}

.tab-close svg {
  width: 12px;
  height: 12px;
}

.tab-bar-empty {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 0.75rem;
  white-space: nowrap;
  color: var(--text-tertiary);
  font-size: 0.75rem;
  font-style: italic;
}

.tab-reorder-announcement {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}