/*
 * Shared chat history list — used by Core's `HistoryPopover`
 * (MultiTabAssistantChat.tsx) and by Agent-Native Code's run rail
 * (code-agents-ui CodeAgentsApp.tsx). Stable, prefixed class names (not
 * Tailwind utilities) so the same visual language works in both a Tailwind
 * host (core/templates) and a plain-CSS host (code-agents-ui), matching the
 * approach used by agent-conversation.css. All colors resolve through the
 * shared `hsl(var(--token))` variables so light/dark both work in either
 * host's theme.
 *
 * Two density variants:
 *   .an-chat-history           default — compact popover list (core)
 *   .an-chat-history--rail     denser rail list with solid active state
 */

.an-chat-history {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.an-chat-history__search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 1px solid hsl(var(--border));
  color: hsl(var(--muted-foreground));
  flex-shrink: 0;
}

.an-chat-history__search-icon {
  flex-shrink: 0;
}

.an-chat-history__search-input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 0;
  outline: none;
  font-size: 12px;
  color: hsl(var(--foreground));
}

.an-chat-history__search-input::placeholder {
  color: hsl(var(--muted-foreground));
}

.an-chat-history__list {
  overflow-y: auto;
  min-width: 0;
  padding: 4px 0;
  max-height: 16rem;
}

.an-chat-history--rail .an-chat-history__list {
  max-height: none;
  flex: 1;
  min-height: 0;
}

.an-chat-history-rail .an-chat-history__state:empty {
  display: none;
}

.an-chat-history__state {
  padding: 16px 12px;
  text-align: center;
  font-size: 12px;
  color: hsl(var(--muted-foreground));
}

.an-chat-history__state--error {
  /* Matches the amber-500 warning tone historically used for the
     HistoryPopover load-error state (Tailwind's `text-amber-500`). */
  color: hsl(38 92% 50%);
}

.an-chat-history-rail__collapse {
  display: flow-root;
  height: auto;
  overflow: hidden;
  overflow: clip;
  opacity: 1;
  clip-path: inset(0);
  interpolate-size: allow-keywords;
  transition:
    height 200ms var(--ease-collapse),
    opacity 150ms ease,
    clip-path 200ms var(--ease-collapse);
}

.an-chat-history-rail__collapse[data-state="closed"] {
  height: 0;
  opacity: 0;
  clip-path: inset(0 0 100% 0);
  pointer-events: none;
}

@starting-style {
  .an-chat-history-rail__collapse[data-state="open"] {
    height: 0;
    opacity: 0;
    clip-path: inset(0 0 100% 0);
  }
}

@supports not (interpolate-size: allow-keywords) {
  .an-chat-history-rail__collapse {
    height: auto;
    max-height: 64rem;
    transition:
      max-height 200ms var(--ease-collapse),
      opacity 150ms ease,
      clip-path 200ms var(--ease-collapse);
  }

  .an-chat-history-rail__collapse[data-state="closed"] {
    max-height: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .an-chat-history-rail__collapse {
    transition: opacity 150ms ease;
  }
}

.an-chat-history-rail__footer {
  display: flex;
  align-items: center;
  gap: 2px;
  min-width: 0;
  padding: 1px 4px 0;
}

.an-chat-history-rail__disclosure,
.an-chat-history-rail__new-chat {
  display: flex;
  align-items: center;
  border: 0;
  border-radius: calc(var(--radius) - 2px);
  background: transparent;
  color: hsl(var(--muted-foreground) / 0.72);
  cursor: pointer;
}

.an-chat-history-rail__disclosure:hover,
.an-chat-history-rail__new-chat:hover {
  background: hsl(var(--accent) / 0.5);
  color: hsl(var(--accent-foreground));
}

.an-chat-history-rail__disclosure:focus-visible,
.an-chat-history-rail__new-chat:focus-visible {
  outline: 2px solid hsl(var(--ring));
  outline-offset: -2px;
}

.an-chat-history-rail__disclosure {
  justify-content: center;
  flex: 0 0 auto;
  width: 30px;
  height: auto;
  min-height: 30px;
}

.an-chat-history-rail__new-chat {
  flex: 0 0 auto;
  margin-inline-end: auto;
  gap: 8px;
  height: auto;
  min-width: 0;
  min-height: 30px;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 500;
  text-align: start;
}

.an-chat-history__section-label {
  padding: 6px 12px 4px;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: hsl(var(--muted-foreground) / 0.7);
}

.an-chat-history--rail .an-chat-history__section {
  display: grid;
  gap: 1px;
  min-width: 0;
}

/* ── Row ──────────────────────────────────────────────────────────────── */

.an-chat-history-row {
  position: relative;
  min-width: 0;
}

.an-chat-history--rail .an-chat-history-row {
  border-radius: calc(var(--radius) - 2px);
  margin: 0 4px;
}

.an-chat-history-row__button {
  display: block;
  width: 100%;
  min-width: 0;
  padding: 8px 12px;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: start;
  cursor: pointer;
}

.an-chat-history-row--disabled .an-chat-history-row__button {
  cursor: default;
  opacity: 0.6;
}

.an-chat-history-row:hover .an-chat-history-row__button {
  background: hsl(var(--accent) / 0.5);
}

.an-chat-history-row--active .an-chat-history-row__button {
  background: hsl(var(--accent) / 0.3);
}

.an-chat-history--rail .an-chat-history-row__button {
  min-height: 32px;
  padding-block: 6px;
  padding-inline: 10px 36px;
  border-radius: inherit;
  color: hsl(var(--muted-foreground));
}

.an-chat-history--rail
  .an-chat-history-row--active
  .an-chat-history-row__button {
  background: hsl(var(--accent));
  color: hsl(var(--accent-foreground));
}

.an-chat-history-row__topline {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
  overflow: hidden;
}

.an-chat-history-row__title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 500;
  color: hsl(var(--muted-foreground));
}

.an-chat-history-row--active .an-chat-history-row__title {
  color: hsl(var(--foreground));
}

.an-chat-history--rail
  .an-chat-history-row--active
  .an-chat-history-row__title {
  color: hsl(var(--accent-foreground));
}

.an-chat-history--rail
  .an-chat-history-row--pinned:not(.an-chat-history-row--active)
  .an-chat-history-row__title {
  color: hsl(var(--muted-foreground));
}

.an-chat-history-row__timestamp {
  flex-shrink: 0;
  font-size: 10px;
  color: hsl(var(--muted-foreground));
}

.an-chat-history--rail .an-chat-history-row__timestamp {
  font-size: 11px;
  color: hsl(var(--muted-foreground) / 0.62);
}

.an-chat-history--rail
  .an-chat-history-row--active
  .an-chat-history-row__timestamp {
  color: hsl(var(--accent-foreground));
}

.an-chat-history-row__subtitle {
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 11px;
  color: hsl(var(--muted-foreground));
}

.an-chat-history-row__detail {
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 10px;
  color: hsl(var(--muted-foreground) / 0.7);
}

/* ── Inline rename ────────────────────────────────────────────────────── */

.an-chat-history-row__rename {
  display: flex;
  align-items: center;
  padding: 6px 12px;
}

.an-chat-history-row__rename-input {
  width: 100%;
  min-width: 0;
  padding: 2px 6px;
  border: 1px solid hsl(var(--ring));
  border-radius: calc(var(--radius) - 3px);
  background: hsl(var(--background));
  color: hsl(var(--foreground));
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  outline: none;
  box-shadow: 0 0 0 2px hsl(var(--ring) / 0.25);
}

.an-chat-history-row__rename-input:focus {
  box-shadow: 0 0 0 2px hsl(var(--ring) / 0.35);
}

/* ── Row action menu ──────────────────────────────────────────────────── */

.an-chat-history-row__menu {
  position: absolute;
  top: 4px;
  inset-inline-end: 4px;
}

.an-chat-history-row__menu-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 0;
  border-radius: calc(var(--radius) - 3px);
  background: transparent;
  color: hsl(var(--muted-foreground) / 0.72);
  opacity: 0;
  cursor: pointer;
  transition:
    background 100ms ease,
    color 100ms ease,
    opacity 100ms ease;
}

.an-chat-history-row:hover .an-chat-history-row__menu-trigger,
.an-chat-history-row:focus-within .an-chat-history-row__menu-trigger,
.an-chat-history-row__menu-trigger[aria-expanded="true"],
.an-chat-history-row__menu-trigger--pinned {
  opacity: 1;
}

.an-chat-history-row__menu-trigger:hover,
.an-chat-history-row__menu-trigger[aria-expanded="true"] {
  background: hsl(var(--accent));
  color: hsl(var(--foreground));
}

.an-chat-history-row__menu-content {
  position: absolute;
  top: calc(100% + 4px);
  inset-inline-end: 0;
  z-index: 30;
  min-width: 160px;
  padding: 4px;
  border: 1px solid hsl(var(--border));
  border-radius: var(--radius);
  background: hsl(var(--popover));
  color: hsl(var(--popover-foreground));
  box-shadow: 0 10px 30px hsl(var(--background) / 0.28);
}

.an-chat-history-row__menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 6px 8px;
  border: 0;
  border-radius: calc(var(--radius) - 4px);
  background: transparent;
  color: inherit;
  font-size: 12px;
  text-align: start;
  cursor: pointer;
}

.an-chat-history-row__menu-item:hover {
  background: hsl(var(--accent));
  color: hsl(var(--accent-foreground));
}

.an-chat-history-row__menu-item--danger {
  color: hsl(var(--destructive));
}

.an-chat-history-row__menu-item--danger:hover {
  background: hsl(var(--destructive) / 0.12);
  color: hsl(var(--destructive));
}