/* ============================================ */
/* SIDEBAR CSS - All sidebar-related styles   */
/* ============================================ */

/* CSS Variables */
:root {
  --sidebar-width: 250px;
  --sidebar-collapsed: 56px;
}

/* ============================================ */
/* BASE LAYOUT & SIDEBAR                      */
/* ============================================ */

.app-layout {
  grid-template-columns: var(--sidebar-width) 1fr;
}

.app-layout.sidebar-collapsed {
  grid-template-columns: var(--sidebar-collapsed) 1fr;
}

.sidebar {
  position: relative;
  z-index: 110;
  height: 100vh;
  width: var(--sidebar-width);
  min-width: 200px;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width .25s cubic-bezier(.2,.7,.2,1), min-width .25s cubic-bezier(.2,.7,.2,1);
  will-change: width, transform;
}

.sidebar-backdrop {
  display: none;
}

/* ============================================ */
/* COLLAPSED STATE                            */
/* ============================================ */

.sidebar-collapsed .sidebar {
  width: var(--sidebar-collapsed);
  min-width: var(--sidebar-collapsed);
}

.sidebar-collapsed #sidebar-toggle,
.sidebar-collapsed .sidebar-actions-pill * {
  pointer-events: auto;
}

/* Toggle button positioned left in collapsed state */
.sidebar-collapsed #sidebar-toggle {
  transform: translateX(-5px);
}

.sidebar-collapsed .main-content {
  margin-left: 0;
  z-index: 1;
}

/* Hide elements when collapsed - with smooth transitions */
.chat-list-heading,
.sidebar-footer,
.sidebar-title {
  transition: all .25s cubic-bezier(.2,.7,.2,1);
}

.sidebar-collapsed .chat-list-heading,
.sidebar-collapsed .sidebar-footer,
.sidebar-collapsed .sidebar-title {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* User menu toggle - remove from layout when collapsed */
#user-menu-toggle {
  transition: all .25s cubic-bezier(.2,.7,.2,1);
  max-width: 200px;
  border-radius: var(--radius-xl);
  transform: translateX(0);
  line-height: 0;
  display: grid;
  place-items: center;
}

#user-menu-toggle svg {
  display: block;
  margin: 0;
}

.sidebar-collapsed #user-menu-toggle {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  display: none;
}

#chat-list {
  transition: all .25s cubic-bezier(.2,.7,.2,1);
}

.sidebar-collapsed #chat-list {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.chat-info {
  transition: all .25s cubic-bezier(.2,.7,.2,1);
}

.sidebar-collapsed .chat-info {
  opacity: 0;
  pointer-events: none;
}

.btn-ghost span {
  transition: all .25s cubic-bezier(.2,.7,.2,1);
}

.sidebar-collapsed .btn-ghost span {
  opacity: 0;
  width: 0;
  overflow: hidden;
}


/* ============================================ */
/* SIDEBAR HEADER                             */
/* ============================================ */

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 0;
  margin: 5px;
  min-height: var(--control-height);
  transition: none;
}

.sidebar-collapsed .sidebar-header {
  justify-content: flex-start;
  padding: 0;
}

.sidebar-collapsed .sidebar-header:hover {
  cursor: ew-resize;
}

.sidebar-collapsed .sidebar:hover {
  cursor: ew-resize;
}

.sidebar-collapsed #sidebar-toggle,
.sidebar-collapsed #sidebar-toggle:hover {
  cursor: ew-resize;
}

.user-profile-btn {
  appearance: none;
  -webkit-appearance: none;
  border-radius: 50%;
  background: transparent;
  border: none;
  width: var(--control-height);
  height: var(--control-height);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  order: 1;
  cursor: pointer;
  transition: opacity .25s cubic-bezier(.2,.7,.2,1);
}

.sidebar-toggle {
  order: 2;
  margin-left: auto;
}

.user-profile-btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.user-profile-btn:hover {
  background: var(--state-hover-soft);
}

.user-profile-btn:active {
  background: var(--active_transparent_btns);
  opacity: 0.6;
}

.user-profile-btn:focus,
.user-profile-btn:focus-visible {
  outline: none;
  box-shadow: none;
}

.sidebar-title {
  font-size: 18px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
}

/* Sidebar toggle button */
#sidebar-toggle {
  border: 0;
  background: transparent;
  padding: 0;
  margin-left: auto;
  line-height: 1;
  font-size: 20px;
  color: #0f172a;
  border-radius: var(--radius-xl);
  cursor: ew-resize;
  transition: background .15s ease, transform .25s cubic-bezier(.2,.7,.2,1);
  width: var(--control-height);
  height: var(--control-height);
  min-width: var(--control-height);
  min-height: var(--control-height);
  box-sizing: border-box;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

#sidebar-toggle:hover {
  background: var(--state-hover-soft);
}

#sidebar-toggle .icon-burger {
  position: absolute;
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
}

#sidebar-toggle .icon-burger line {
  transform-origin: 50% 50%;
  transition: transform .25s cubic-bezier(.2,.7,.2,1);
  stroke-width: 1.5;
}

#sidebar-toggle .icon-burger .line-top {
  transform: rotate(45deg);
}

#sidebar-toggle .icon-burger .line-bottom {
  transform: rotate(-45deg);
}

.sidebar-collapsed #sidebar-toggle .icon-burger .line-top {
  transform: translateY(-3px);
}

.sidebar-collapsed #sidebar-toggle .icon-burger .line-bottom {
  transform: translateY(3px);
}

/* ============================================ */
/* SIDEBAR ACTIONS & BUTTONS                  */
/* ============================================ */

.sidebar-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 0;
  margin-top: -7px;
}

.sidebar-collapsed .sidebar-actions {
  padding: 0;
}

.btn-secondary {
  padding: 9px 12px;
  height: var(--control-height);
  min-height: var(--control-height);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, opacity .1s ease;
  font-size: 14px;
  font-family: var(--font-default);
  box-sizing: border-box;
}

.btn-secondary:focus,
.btn-secondary:focus-visible {
  outline: none;
  box-shadow: none;
}

.btn-secondary:hover {
  background: var(--hover_transparent_btns);
}

.btn-secondary:active {
  background: var(--active_transparent_btns);
  opacity: 0.6;
}

.btn-icon:not(.user-profile-btn) {
  width: var(--control-height);
  height: var(--control-height);
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
}

.btn-icon:not(.user-profile-btn) svg {
  width: 18px;
  height: 18px;
}

/* Active state for navigation buttons */
#new-chat.active,
#files-btn.active,
#vector-search-btn.active,
#editor-btn.active {
  background: var(--file-item-active);
  color: var(--file-item-active-text);
}

#new-chat.active:hover,
#files-btn.active:hover,
#vector-search-btn.active:hover,
#editor-btn.active:hover {
  background: color-mix(in srgb, var(--active_transparent_btns) 70%, white);
}

#new-chat.active:active,
#files-btn.active:active,
#vector-search-btn.active:active,
#editor-btn.active:active {
  color: color-mix(in srgb, var(--file-item-active-text) 70%, white);
}

.sidebar-actions-pill .btn-secondary .icon-active {
  display: none;
}

#new-chat.active .icon-default,
#files-btn.active .icon-default,
#vector-search-btn.active .icon-default,
#editor-btn.active .icon-default {
  display: none;
}

#new-chat.active .icon-active,
#files-btn.active .icon-active,
#vector-search-btn.active .icon-active,
#editor-btn.active .icon-active {
  display: inline;
}

/* Sidebar open button container - removed */

/* Actions pill container */
.sidebar-actions-pill {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: var(--padding-xs);
  margin: 5px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  overflow: hidden;
  width: calc(var(--sidebar-width) - 10px);
  transition: width .25s cubic-bezier(.2,.7,.2,1);
  cursor: pointer;
}

.sidebar-collapsed .sidebar-actions-pill {
  width: calc(var(--sidebar-collapsed) - 10px);
}

.sidebar-actions-pill .btn-secondary {
  margin: 0;
  padding: 7px 12px;
  flex-shrink: 0;
  white-space: nowrap;
  gap: 0;
  position: relative;
  width: 100%;
  border: none;
  cursor: pointer;
}

.sidebar-actions-pill .btn-secondary:hover {
  background: var(--file-item-hover);
}

.sidebar-actions-pill .btn-secondary:active {
  opacity: 1;
}

.sidebar-actions-pill .btn-secondary.is-pressed {
  opacity: 1;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active {
  color: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
  fill: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active {
  color: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
  fill: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active path,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active circle,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active line,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active polyline,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active polygon,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:active .icon-active ellipse {
  fill: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
  stroke: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active path,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active circle,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active line,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active polyline,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active polygon,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary.is-pressed .icon-active ellipse {
  fill: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
  stroke: color-mix(in srgb, var(--file-item-active-text) 70%, white) !important;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active):active .icon-default path,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active):active .icon-default circle,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active):active .icon-default line,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active):active .icon-default polyline,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active):active .icon-default polygon,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active):active .icon-default ellipse {
  fill: #5a5a5a !important;
  stroke: #5a5a5a !important;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active).is-pressed .icon-default path,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active).is-pressed .icon-default circle,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active).is-pressed .icon-default line,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active).is-pressed .icon-default polyline,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active).is-pressed .icon-default polygon,
.sidebar-collapsed .sidebar-actions-pill .btn-secondary:not(.active).is-pressed .icon-default ellipse {
  fill: #5a5a5a !important;
  stroke: #5a5a5a !important;
}

.sidebar-actions-pill .btn-secondary svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  transform: translateX(-3px);
}

.sidebar-actions-pill .btn-secondary span {
  position: absolute;
  left: 38px;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  transform: none;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all .25s cubic-bezier(.2,.7,.2,1);
  pointer-events: none;
  font-family: var(--font-default);
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.app-layout:not(.sidebar-collapsed) .sidebar-actions-pill .btn-secondary span {
  opacity: 1;
  visibility: visible;
}

.app-layout:not(.sidebar-collapsed) .sidebar-actions-pill .btn-secondary:active span {
  opacity: 0.6;
}

.app-layout:not(.sidebar-collapsed) .sidebar-actions-pill .btn-secondary.is-pressed span {
  opacity: 0.6;
}

.sidebar-collapsed .sidebar-actions-pill .btn-secondary span {
  opacity: 0;
  visibility: hidden;
}

/* ============================================ */
/* CHAT LIST                                  */
/* ============================================ */

.chat-list-heading {
  font-family: 'Instrument Serif' !important;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 0 7px 0 7px;
  padding-left: 14px;
  user-select: none;
}

.chat-list {
  position: relative;
  padding: var(--padding-xs) 0 var(--padding-xs) var(--padding-xs);
  margin: 0 3px 0px 7px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  background: transparent;
  border: none;
  box-shadow: none;
}

.chat-list-scroll {
  overflow: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: auto;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.chat-list-scroll::-webkit-scrollbar {
  width: 10px;
}

.chat-list-scroll::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.chat-list-scroll::-webkit-scrollbar-thumb:hover {
  background: color-mix(in oklab, var(--border) 85%, black);
}

.chat-list-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.chat-avatar {
  display: none;
}

.chat-item {
  position: relative;
  text-align: left;
  padding: 7px 10px;
  height: var(--control-height);
  min-height: var(--control-height);
  border-radius: 18px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background .15s ease, opacity .1s ease;
  display: flex;
  align-items: center;
  min-width: 0;
  font-family: var(--font-default);
  font-size: 14px;
  user-select: none;
}

.chat-item:hover {
  background: var(--hover_transparent_btns);
}

.chat-item:active {
  background: color-mix(in srgb, var(--hover_transparent_btns) 70%, white);
  opacity: 1;
}

.chat-item:not(.chat-item--menu-open):hover:has(.chat-menu-btn:hover) {
  background: transparent;
}

.chat-item:hover .chat-menu-btn {
  opacity: 1;
}

.chat-item.active {
  background: var(--active_transparent_btns);
  height: var(--control-height);
}

.chat-item.active:active {
  background: color-mix(in srgb, var(--active_transparent_btns) 70%, white);
  opacity: 1;
}

.chat-item.active .chat-menu-btn {
  opacity: 0;
  pointer-events: none;
}

.chat-item.active:hover .chat-menu-btn {
  opacity: 1;
  pointer-events: auto;
}

.chat-item.chat-item--menu-open {
  background: var(--active_transparent_btns);
}

.chat-item.chat-item--renaming {
  background: var(--hover_transparent_btns);
}

.chat-item.active.chat-item--renaming {
  background: var(--active_transparent_btns);
}

.chat-item.chat-item--menu-open .chat-preview::after {
  opacity: 0;
}

.chat-item:not(.chat-item--menu-open):has(.chat-menu-btn:active),
.chat-item:not(.chat-item--menu-open):has(.chat-menu-dropdown .chat-menu-item:active) {
  background: transparent;
  opacity: 1;
}

.chat-info {
  flex: 1;
  min-width: 0;
  opacity: 1;
  transition: opacity .25s cubic-bezier(.2,.7,.2,1);
}

.chat-preview {
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex: 1 1 auto;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  padding-right: 28px;
  position: relative;
}

.chat-list .chat-preview {
  padding-right: 28px;
}

.chat-list .chat-preview::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 0px;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.6) 70%, var(--surface) 100%);
  opacity: 0;
  transition: opacity .18s ease;
}

.chat-item:not(.chat-item--renaming):hover .chat-preview::after,
.chat-item:not(.chat-item--renaming):focus-within .chat-preview::after {
  opacity: 0.85;
}

.chat-item--renaming .chat-menu-btn {
  opacity: 0 !important;
  pointer-events: none;
}

.chat-item--renaming .chat-preview::after {
  opacity: 0;
}

.chat-preview .chat-title {
  display: block;
  font-size: 14px;
  line-height: 1.2;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-item.active .chat-preview .chat-title {
  color: var(--file-item-active-text);
}

.chat-preview .chat-snippet {
  font-size: 14px;
  color: var(--muted);
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-snippet--muted {
  opacity: 0.35;
}

.chat-name {
  font-size: 15px;
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: transform .1s ease;
}

/* ============================================ */
/* CHAT MENU                                  */
/* ============================================ */

.chat-menu-btn {
  opacity: 0;
  position: absolute;
  right: var(--padding-xs);
  top: 50%;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: transparent;
  border: none;
  box-shadow: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity .15s ease, background .15s ease;
  padding: 0;
  color: var(--text);
  font-size: 0;
  font-weight: 600;
  line-height: 1;
  transform: translateY(-50%);
  z-index: 2;
}

.chat-menu-btn:hover,
.chat-menu-btn:focus-visible,
.chat-menu-btn:active {
  background: transparent;
}

.chat-item.active .chat-menu-btn:hover,
.chat-item.active .chat-menu-btn:focus-visible,
.chat-item.active .chat-menu-btn:active {
  background: transparent;
}

.chat-menu-icon {
  display: block;
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.chat-menu-dropdown {
  position: fixed;
  left: 0;
  top: 0;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  z-index: 200000; /* Keep above chat preview text and main content */
  min-width: 170px;
  overflow: hidden;
  padding: var(--padding-xs);
  display: flex;
  flex-direction: column;
  gap: 2px;
  opacity: 0;
  transform: translate(-6px, calc(var(--padding-xs) * -1));
  transition: opacity 0.12s ease, transform 0.12s ease;
  visibility: hidden;
  pointer-events: none;
}

.chat-menu-dropdown.visible {
  background: var(--glass-surface-70);
  opacity: 1;
  transform: translate(0, 0);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  visibility: visible;
  pointer-events: auto;
  animation: chat-menu-fade 0.12s ease-out;
}

.chat-menu-list {
  display: flex;
  flex-direction: column;
}

.chat-menu-item {
  padding: 8px 12px;
  height: var(--control-height);
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  font-size: 14px;
  line-height: 1.2;
  font-family: var(--font-default);
  color: var(--text);
  display: grid;
  grid-template-columns: 22px 1fr;
  column-gap: 10px;
  align-items: center;
  border-radius: 18px;
  transition: background .15s ease, color .15s ease, opacity .1s ease;
}

.chat-menu-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.chat-menu-item:hover {
  background: var(--hover_transparent_btns);
  color: var(--text);
}

.chat-menu-item:active {
  background: var(--active_transparent_btns);
  opacity: 0.6;
}

.chat-menu-item.danger {
  color: var(--danger);
  white-space: nowrap;
}

.chat-menu-item.danger svg {
  color: var(--danger);
}

.chat-menu-item.danger:hover {
  background: rgba(220, 38, 38, 0.1);
}

@keyframes chat-menu-fade {
  from {
    opacity: 0;
    transform: translateY(calc(var(--padding-xs) * -1));
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================ */
/* CHAT RENAME                                */
/* ============================================ */

.chat-rename-inline {
  width: 100%;
  border: none;
  border-radius: 0;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  font-weight: 400;
  background: transparent;
  color: var(--text);
  outline: none;
  box-shadow: none;
  line-height: 1.2;
}

.chat-rename-inline:focus {
  box-shadow: none;
}

.chat-rename-inline--error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
  background: rgba(239, 68, 68, 0.05);
}

.chat-rename-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 14px 12px;
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

.chat-rename-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.chat-rename-label {
  font-size: 12px;
  font-weight: 500;
  color: rgba(15, 23, 42, 0.7);
}

.chat-rename-input {
  width: 100%;
  border: 1px solid var(--shadow);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--text);
  background: var(--glass-surface-90);
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}

.chat-rename-input:focus {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background: var(--surface);
}

.chat-rename-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.chat-rename-actions button {
  font-size: 14px;
  border-radius: 8px;
  padding: 6px 12px;
  border: none;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, box-shadow .15s ease;
}

.chat-rename-cancel {
  background: rgba(148, 163, 184, 0.16);
  color: rgba(15, 23, 42, 0.8);
}

.chat-rename-cancel:hover {
  background: rgba(148, 163, 184, 0.32);
}

.chat-rename-save {
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: #fff;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.25);
}

.chat-rename-save:hover {
  box-shadow: 0 8px 18px rgba(79, 70, 229, 0.35);
}

.chat-rename-save:disabled {
  opacity: 0.6;
  cursor: default;
  box-shadow: none;
}

.chat-rename-error {
  min-height: 16px;
  font-size: 12px;
  color: var(--danger);
}

/* ============================================ */
/* SIDEBAR FOOTER                             */
/* ============================================ */

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
}

.btn-ghost {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: transparent;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  color: #0f172a;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background .15s ease, border-color .15s ease;
}

.btn-ghost:hover {
  background: rgba(0,0,0,.05);
}

.sidebar-collapsed .btn-ghost {
  width: 44px;
  height: 44px;
  padding: 0;
  justify-content: center;
}

/* ============================================ */
/* DESKTOP RESPONSIVE (min-width: 769px)      */
/* ============================================ */

.chat-header .mobile-only {
  display: none !important;
}

.mobile-only {
  display: none;
}

@media (min-width: 769px) {
  .btn-icon.mobile-only {
    display: none !important;
  }
}


/* ============================================ */
/* MOBILE RESPONSIVE (max-width: 768px)       */
/* ============================================ */

@media (max-width: 768px) {
  .app-layout,
  .app-layout.sidebar-collapsed {
    grid-template-columns: 1fr;
  }

  /* Default state: hidden sidebar that overlays content */
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 250px; /* Fixed width for mobile sidebar */
    transform: translateX(-100%);
    z-index: 2000; /* High z-index to overlay everything */
    box-shadow: 0 0 20px var(--state-hover-strong);
    background: var(--bg);
    transition: transform 0.3s cubic-bezier(.2,.7,.2,1);
    display: flex !important;
  }

  /* Hidden state is default via transform translateX(-100%) */
  
  /* Open state */
  .sidebar.open {
    transform: translateX(0);
    background: var(--bg);
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: var(--overlay-strong);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s cubic-bezier(.2,.7,.2,1);
    z-index: 1500;
  }

  .sidebar.open ~ .sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  /* Show mobile menu button when sidebar is closed */
  .mobile-only {
    display: inline-flex;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--glass-surface-90);
    border: 1px solid var(--overlay-soft);
    box-shadow: 0 2px 8px var(--overlay-soft);
    transition: all 0.2s ease, opacity 0.3s ease;
    opacity: 1;
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 1000;
  }

  /* Hide toggle button when sidebar is open (optional, or move it inside sidebar) */
  .sidebar.open + .main-content .mobile-only {
    opacity: 0;
    pointer-events: none;
  }

  /* Adjust main content to take full width */
  .main-content {
    margin-left: 0 !important;
    width: 100%;
  }

  .main-content.chat-mode {
    top: 0 !important;
  }
}