/* ═══════════════════════════════════════════════════════════
   sidebar.css — Chat history sidebar (RTL)
   Brand · actions (new chat + search) · grouped history · account menu
   Expanded (288px) · collapsed rail (68px) · mobile drawer with backdrop
   ═══════════════════════════════════════════════════════════ */

:root {
  --sidebar-width: 288px;
  --sidebar-collapsed: 68px;
  --sb-bg: #101011;
  --sb-surface: #19191B;
  --sb-hover: rgba(255, 255, 255, 0.045);
  --sb-active: rgba(220, 38, 38, 0.11);
  --sb-active-border: rgba(220, 38, 38, 0.35);
  --sb-divider: rgba(255, 255, 255, 0.06);
  --sb-text: #ECECEC;
  --sb-text-2: #A1A1A6;
  --sb-text-3: #6E6E73;
  --sb-icon-bg: rgba(255, 255, 255, 0.05);
  --sb-hover-solid: #1B1B1C;
  --sb-active-solid: #261313;
  --sb-shadow: 0 12px 32px rgba(0, 0, 0, 0.55), 0 2px 6px rgba(0, 0, 0, 0.35);
  --sb-ease: cubic-bezier(0.22, 1, 0.36, 1);
}
body.light-theme {
  --sb-bg: #F6F6F7;
  --sb-surface: #FFFFFF;
  --sb-hover: rgba(0, 0, 0, 0.045);
  --sb-active: rgba(220, 38, 38, 0.08);
  --sb-active-border: rgba(220, 38, 38, 0.28);
  --sb-divider: rgba(0, 0, 0, 0.07);
  --sb-text: #1C1C1E;
  --sb-text-2: #55555B;
  --sb-text-3: #8E8E93;
  --sb-icon-bg: rgba(0, 0, 0, 0.045);
  --sb-hover-solid: #EBEBEC;
  --sb-active-solid: #F4E5E6;
  --sb-shadow: 0 12px 32px rgba(0, 0, 0, 0.14), 0 2px 6px rgba(0, 0, 0, 0.08);
}

/* ── Shell ── */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--sb-bg);
  border-left: 1px solid var(--sb-divider);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 100;
  transition: width 320ms var(--sb-ease), min-width 320ms var(--sb-ease), transform 320ms var(--sb-ease);
  color: var(--sb-text);
}
.sidebar.collapsed {
  width: var(--sidebar-collapsed);
  min-width: var(--sidebar-collapsed);
}

/* ── Brand row ── */
.sb-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 14px 10px 10px;
}
.sb-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  background: none;
  border: none;
  padding: 2px;
  border-radius: 10px;
  cursor: default;
  color: inherit;
  text-align: right;
  position: relative;
  transition: background 200ms ease;
}

/* Logo ⇄ "open sidebar" icon share one slot and morph into each other */
.sb-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  transition: transform 160ms var(--sb-ease);
}
.sb-mark > * { grid-area: 1 / 1; }
.sb-logo {
  width: 34px;
  height: 34px;
  object-fit: contain;
  transition: opacity 260ms var(--sb-ease), transform 420ms var(--sb-ease), filter 260ms ease;
}
.sb-mark .sb-open-icon {
  width: 22px;
  height: 22px;
  color: var(--sb-text);
  opacity: 0;
  transform: scale(0.6) rotate(14deg);
  filter: blur(3px);
  transition: opacity 260ms var(--sb-ease), transform 420ms var(--sb-ease), filter 260ms ease;
  pointer-events: none;
}

/* Panel icon: frame + panel (right side, RTL) + divider + arrow, each part animates */
.sb-panel-icon {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  overflow: visible;
}
.sb-panel-icon .pi-fill {
  fill: currentColor;
  stroke: none;
  opacity: 0.16;
  transform-box: fill-box;
  transform-origin: 100% 50%;
  transition: transform 420ms var(--sb-ease), opacity 260ms ease;
}
.sb-panel-icon .pi-line,
.sb-panel-icon .pi-arrow {
  transition: transform 420ms var(--sb-ease), opacity 220ms ease;
}
/* "open" icon rests half-closed; hovering the logo slides the panel open */
.sb-open-icon .pi-fill { transform: scaleX(0.45); }
.sb-open-icon .pi-line { transform: translateX(3.3px); }
.sb-open-icon .pi-arrow { transform: translateX(3px); opacity: 0; }
/* collapse button: hovering slides the panel shut and nudges the arrow toward the edge */
.sb-collapse:hover .pi-fill,
.sb-collapse:focus-visible .pi-fill { transform: scaleX(0.45); opacity: 0.24; }
.sb-collapse:hover .pi-line,
.sb-collapse:focus-visible .pi-line { transform: translateX(3.3px); }
.sb-collapse:hover .pi-arrow,
.sb-collapse:focus-visible .pi-arrow { transform: translateX(1.5px); }

/* tooltip for the collapsed rail */
.sb-tip { display: none; }
.sb-brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.25;
}
.sb-name {
  font-size: 1.02rem;
  font-weight: var(--font-weight-bold);
  color: var(--sb-text);
  white-space: nowrap;
}
.sb-tagline {
  font-size: 0.72rem;
  color: var(--sb-text-3);
  white-space: nowrap;
}

.sb-icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--sb-text-3);
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.sb-icon-btn:hover {
  background: var(--sb-hover);
  color: var(--sb-text);
}
.sb-icon-btn:focus-visible,
.sb-new:focus-visible,
.chat-item:focus-visible,
.sb-user:focus-visible,
.sb-menu-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

/* ── Actions: new chat + search ── */
.sb-actions {
  padding: 4px 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.sb-new {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border-radius: 11px;
  border: 1px solid var(--sb-divider);
  background: var(--sb-surface);
  color: var(--sb-text);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.sb-new-icon {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: var(--color-primary);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  flex-shrink: 0;
}
.sb-new:hover {
  border-color: var(--sb-active-border);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}
.sb-new span.sb-new-label { flex: 1; text-align: right; }

.sb-kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.66rem;
  color: var(--sb-text-3);
  border: 1px solid var(--sb-divider);
  border-radius: 5px;
  padding: 1px 5px;
  direction: ltr;
  white-space: nowrap;
}

.sb-search {
  position: relative;
  display: flex;
  align-items: center;
}
.sb-search > i {
  position: absolute;
  right: 12px;
  font-size: 0.8rem;
  color: var(--sb-text-3);
  pointer-events: none;
}
.sb-search input {
  width: 100%;
  height: 36px;
  padding: 0 34px 0 56px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--sb-hover);
  color: var(--sb-text);
  font-size: 0.83rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.sb-search input::placeholder { color: var(--sb-text-3); }
.sb-search input:focus {
  outline: none;
  border-color: var(--sb-active-border);
  background: var(--sb-surface);
}
.sb-search .sb-kbd { position: absolute; left: 10px; pointer-events: none; }
.sb-search-clear {
  position: absolute;
  left: 6px;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--sb-text-3);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}
.sb-search-clear:hover { color: var(--sb-text); background: var(--sb-hover); }
.sb-search.has-value .sb-search-clear { display: inline-flex; }
.sb-search.has-value .sb-kbd { display: none; }

/* ── History list ── */
.chat-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 8px 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--sb-divider) transparent;
}
.chat-list::-webkit-scrollbar { width: 6px; }
.chat-list::-webkit-scrollbar-thumb { background: var(--sb-divider); border-radius: 6px; }

.chat-group + .chat-group { margin-top: 6px; }
.chat-group-header {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 8px 6px;
  background: var(--sb-bg);
  font-size: 0.72rem;
  font-weight: var(--font-weight-medium);
  color: var(--sb-text-3);
}
.chat-group-header i { font-size: 0.66rem; }
.chat-group-count {
  font-size: 0.66rem;
  min-width: 18px;
  height: 16px;
  padding: 0 5px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--sb-hover);
  color: var(--sb-text-3);
}

.chat-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  margin: 1px 0;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  /* off-screen chats skip layout/paint: keeps expand/collapse smooth with hundreds of chats */
  content-visibility: auto;
  contain-intrinsic-size: auto 54px;
}
.chat-item:hover { background: var(--sb-hover); }
.chat-item.active {
  background: var(--sb-active);
  border-color: var(--sb-active-border);
}
.chat-item.active::before {
  content: "";
  position: absolute;
  right: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 3px 0 0 3px;
  background: var(--color-primary);
}

.chat-item-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--sb-icon-bg);
  color: var(--sb-text-2);
  font-size: 0.8rem;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.chat-item.active .chat-item-icon,
.chat-item:hover .chat-item-icon {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
}
.chat-item.streaming .chat-item-icon { color: var(--color-primary); }

.chat-item-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.chat-item-line {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
}
.chat-item-title {
  flex: 1;
  min-width: 0;
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  color: var(--sb-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chat-item-time {
  flex-shrink: 0;
  font-size: 0.68rem;
  color: var(--sb-text-3);
  white-space: nowrap;
  direction: rtl;
}
.chat-item-preview {
  font-size: 0.75rem;
  color: var(--sb-text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chat-item mark {
  font-weight: var(--font-weight-medium);
  background: rgba(220, 38, 38, 0.22);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}
.chat-item-pin {
  font-size: 0.62rem;
  color: var(--color-primary);
  transform: rotate(45deg);
  margin-inline-start: 2px;
}

/* hover actions take the place of the time; the text makes room and truncates cleanly */
.chat-item-actions {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: 3px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}
.chat-item:hover .chat-item-actions,
.chat-item:focus-within .chat-item-actions,
.chat-item.actions-open .chat-item-actions {
  opacity: 1;
  pointer-events: auto;
}
.chat-item:hover .chat-item-body,
.chat-item:focus-within .chat-item-body,
.chat-item.actions-open .chat-item-body { padding-left: 86px; }
.chat-item:hover .chat-item-time,
.chat-item:focus-within .chat-item-time,
.chat-item.actions-open .chat-item-time { visibility: hidden; }
.chat-item-more {
  display: none;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--sb-text-3);
  cursor: pointer;
  flex-shrink: 0;
}
.chat-item-btn {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  border: none;
  background: var(--sb-surface);
  color: var(--sb-text-2);
  font-size: 0.72rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 1px var(--sb-divider);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.chat-item-btn:hover { color: var(--sb-text); }
.chat-item-btn.delete:hover { color: var(--color-error); }
.chat-item-btn.pin i { transform: rotate(45deg); }
.chat-item-btn.pin.on { color: var(--color-primary); }

/* empty / no results */
.empty-chats-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 36px 16px;
  text-align: center;
  color: var(--sb-text-3);
}
.empty-chats-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  font-size: 1.05rem;
}
.empty-chats-text { font-size: 0.82rem; color: var(--sb-text-2); }
.empty-chats-hint { font-size: 0.72rem; }

/* ── Footer: account button + menu ── */
.sidebar-footer {
  position: relative;
  padding: 10px 10px 12px;
  border-top: 1px solid var(--sb-divider);
}
.sb-user {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 8px;
  border-radius: 11px;
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-align: right;
  font-family: inherit;
  transition: background var(--transition-fast);
}
.sb-user:hover,
.sb-user[aria-expanded="true"] { background: var(--sb-hover); }
.sb-user-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.sb-user-name {
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  color: var(--sb-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sb-user-role {
  font-size: 0.7rem;
  color: var(--sb-text-3);
  display: flex;
  align-items: center;
  gap: 6px;
  direction: rtl;
}
.sb-user-handle { direction: ltr; }
.sb-role-pill {
  font-size: 0.62rem;
  padding: 0 6px;
  border-radius: 6px;
  line-height: 16px;
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  border: 1px solid var(--sb-active-border);
}
.sb-user-chevron { color: var(--sb-text-3); font-size: 0.7rem; }

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: var(--font-weight-bold);
  font-size: 0.85rem;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
}
.user-avatar img { width: 100%; height: 100%; object-fit: cover; }

.sb-menu {
  position: absolute;
  right: 10px;
  left: 10px;
  bottom: calc(100% + 6px);
  z-index: 300;
  padding: 6px;
  border-radius: 14px;
  background: var(--sb-surface);
  border: 1px solid var(--sb-divider);
  box-shadow: var(--sb-shadow);
  transform-origin: bottom center;
  animation: sb-menu-in 140ms ease-out;
}
.sb-menu[hidden] { display: none; }
@keyframes sb-menu-in {
  from { opacity: 0; transform: translateY(6px) scale(0.98); }
  to { opacity: 1; transform: none; }
}
.sb-menu-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 8px 10px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--sb-divider);
}
.sb-menu-head .user-avatar { width: 38px; height: 38px; }
.sb-menu-head-text { display: flex; flex-direction: column; min-width: 0; line-height: 1.35; }
.sb-menu-head-text strong { font-size: 0.86rem; color: var(--sb-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sb-menu-head-text span { font-size: 0.72rem; color: var(--sb-text-3); direction: ltr; text-align: right; }
.sb-menu-item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--sb-text);
  font-size: 0.83rem;
  font-family: inherit;
  cursor: pointer;
  text-align: right;
  transition: background var(--transition-fast);
}
.sb-menu-item:hover { background: var(--sb-hover); }
.sb-menu-item > i {
  width: 18px;
  text-align: center;
  color: var(--sb-text-2);
  font-size: 0.85rem;
}
.sb-menu-item .sb-menu-meta { margin-inline-start: auto; font-size: 0.72rem; color: var(--sb-text-3); }
.sb-menu-item.danger,
.sb-menu-item.danger > i { color: var(--color-error); }
.sb-menu-sep { height: 1px; margin: 4px 6px; background: var(--sb-divider); }

/* ── Collapsed rail ── */
.sidebar.collapsed .sb-top { flex-direction: column; padding: 14px 0 8px; gap: 10px; }
.sidebar.collapsed .sb-brand {
  cursor: pointer;
  width: 44px;
  height: 44px;
  padding: 0;
  justify-content: center;
  border-radius: 12px;
}
.sidebar.collapsed .sb-brand:active .sb-mark { transform: scale(0.9); }
.sidebar.collapsed .sb-brand:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 1px; }

/* hover / keyboard focus: the logo turns away and the "open sidebar" icon turns in */
@media (hover: hover) {
  .sidebar.collapsed .sb-brand:hover { background: var(--sb-hover); }
  .sidebar.collapsed .sb-brand:hover .sb-logo { opacity: 0; transform: scale(0.6) rotate(-14deg); filter: blur(3px); }
  .sidebar.collapsed .sb-brand:hover .sb-open-icon { opacity: 1; transform: none; filter: none; }
  .sidebar.collapsed .sb-brand:hover .pi-fill,
  .sidebar.collapsed .sb-brand:hover .pi-line { transform: none; transition-delay: 70ms; }
  .sidebar.collapsed .sb-brand:hover .pi-arrow { transform: none; opacity: 1; transition-delay: 130ms; }
}
.sidebar.collapsed .sb-brand:focus-visible { background: var(--sb-hover); }
.sidebar.collapsed .sb-brand:focus-visible .sb-logo { opacity: 0; transform: scale(0.6) rotate(-14deg); filter: blur(3px); }
.sidebar.collapsed .sb-brand:focus-visible .sb-open-icon { opacity: 1; transform: none; filter: none; }
.sidebar.collapsed .sb-brand:focus-visible .pi-fill,
.sidebar.collapsed .sb-brand:focus-visible .pi-line { transform: none; }
.sidebar.collapsed .sb-brand:focus-visible .pi-arrow { transform: none; opacity: 1; }

/* tooltip beside the rail: waits a beat, then glides out from the rail */
.sidebar.collapsed .sb-tip {
  display: flex;
  align-items: center;
  gap: 8px;
  position: absolute;
  right: calc(100% + 14px);
  top: 50%;
  transform: translate(6px, -50%);
  padding: 6px 10px;
  border-radius: 8px;
  background: var(--sb-surface);
  border: 1px solid var(--sb-divider);
  box-shadow: var(--sb-shadow);
  color: var(--sb-text);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease, transform 260ms var(--sb-ease);
  z-index: 5;
}
.sidebar.collapsed .sb-tip kbd {
  font-family: inherit;
  font-size: 0.68rem;
  direction: ltr;
  color: var(--sb-text-3);
  border: 1px solid var(--sb-divider);
  border-radius: 5px;
  padding: 1px 5px;
}
@media (hover: hover) {
  .sidebar.collapsed .sb-brand:hover .sb-tip { opacity: 1; transform: translate(0, -50%); transition-delay: 320ms; }
}
.sidebar.collapsed .sb-brand-text,
.sidebar.collapsed .sb-collapse { display: none; }
.sidebar.collapsed .sb-actions { padding: 4px 0 10px; align-items: center; }
.sidebar.collapsed .sb-new { width: 44px; height: 44px; padding: 0; justify-content: center; border-radius: 12px; }
.sidebar.collapsed .sb-new-icon { width: 28px; height: 28px; font-size: 0.8rem; }
.sidebar.collapsed .sb-new-label,
.sidebar.collapsed .sb-new .sb-kbd { display: none; }
.sidebar.collapsed .sb-search { width: 44px; height: 40px; justify-content: center; cursor: pointer; border-radius: 12px; }
.sidebar.collapsed .sb-search:hover { background: var(--sb-hover); }
.sidebar.collapsed .sb-search input,
.sidebar.collapsed .sb-search .sb-kbd,
.sidebar.collapsed .sb-search-clear { display: none !important; }
.sidebar.collapsed .sb-search > i { position: static; font-size: 0.95rem; }
.sidebar.collapsed .chat-list { padding: 0 10px 10px; }
.sidebar.collapsed .chat-group-header { display: none; }
.sidebar.collapsed .chat-group + .chat-group { margin-top: 0; padding-top: 6px; border-top: 1px solid var(--sb-divider); }
.sidebar.collapsed .chat-item { justify-content: center; padding: 5px 0; }
.sidebar.collapsed .chat-item.active::before { display: none; }
.sidebar.collapsed .chat-item-body,
.sidebar.collapsed .chat-item-actions { display: none !important; }
.sidebar.collapsed .chat-item-icon { width: 34px; height: 34px; font-size: 0.85rem; }
.sidebar.collapsed .empty-chats-text,
.sidebar.collapsed .empty-chats-hint { display: none; }
.sidebar.collapsed .sidebar-footer { padding: 10px 0 12px; display: flex; justify-content: center; }
.sidebar.collapsed .sb-user { width: auto; padding: 4px; border-radius: 50%; }
.sidebar.collapsed .sb-user-text,
.sidebar.collapsed .sb-user-chevron { display: none; }
.sidebar.collapsed .sb-menu { right: calc(100% + 10px); left: auto; bottom: 8px; width: 250px; transform-origin: bottom right; }

/* ── Expand / collapse choreography (classes set by Sidebar.toggle, desktop only) ── */
.sidebar.sb-anim-out .sb-brand-text,
.sidebar.sb-anim-out .sb-collapse,
.sidebar.sb-anim-out .sb-new-label,
.sidebar.sb-anim-out .sb-new .sb-kbd,
.sidebar.sb-anim-out .sb-search input,
.sidebar.sb-anim-out .sb-search .sb-kbd,
.sidebar.sb-anim-out .chat-group-header,
.sidebar.sb-anim-out .chat-item-body,
.sidebar.sb-anim-out .sb-user-text,
.sidebar.sb-anim-out .sb-user-chevron {
  opacity: 0;
  transition: opacity 110ms ease;
}
.sidebar.sb-anim-in .sb-brand-text,
.sidebar.sb-anim-in .sb-collapse,
.sidebar.sb-anim-in .sb-new-label,
.sidebar.sb-anim-in .sb-new .sb-kbd,
.sidebar.sb-anim-in .sb-search input,
.sidebar.sb-anim-in .sb-search .sb-kbd,
.sidebar.sb-anim-in .chat-list,
.sidebar.sb-anim-in .sb-user-text,
.sidebar.sb-anim-in .sb-user-chevron {
  animation: sbLabelIn 340ms var(--sb-ease) 110ms both;
}
/* the history list fades in as one layer (one animation instead of one per chat) */
@keyframes sbLabelIn {
  from { opacity: 0; transform: translateX(10px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .sb-logo,
  .sb-open-icon,
  .sb-panel-icon *,
  .sb-tip { transition-duration: 1ms !important; transition-delay: 0s !important; }
  .sidebar.sb-anim-in * { animation: none !important; }
}

/* ── Mobile drawer ── */
.sb-backdrop { display: none; }
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 200;
    width: min(86vw, 320px);
    min-width: 0;
    box-shadow: var(--sb-shadow);
  }
  .sidebar.collapsed {
    width: min(86vw, 320px);
    min-width: 0;
    transform: translateX(105%);
    box-shadow: none;
  }
  /* on phones the drawer is always the full (expanded) layout */
  .sidebar.collapsed .sb-top { flex-direction: row; padding: 14px 14px 10px 10px; }
  .sidebar.collapsed .sb-brand-text,
  .sidebar.collapsed .sb-collapse { display: flex; }
  .sb-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 190;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(2px);
    opacity: 1;
    transition: opacity var(--transition-base);
  }
  .sidebar.collapsed + .sb-backdrop { opacity: 0; pointer-events: none; }
  /* touch: one "more" button per row instead of three always-visible buttons */
  .chat-item-more { display: inline-flex; align-items: center; justify-content: center; }
  .chat-item.actions-open .chat-item-more { display: none; }
  .chat-item:hover .chat-item-actions { opacity: 0; pointer-events: none; }
  .chat-item.actions-open .chat-item-actions { opacity: 1; pointer-events: auto; }
  .chat-item:hover .chat-item-body { padding-left: 0; }
  .chat-item.actions-open .chat-item-body { padding-left: 86px; }
  .chat-item-time { display: none; }
  .sb-kbd { display: none !important; }
}