/* ============================================
   GROK — AI Chat Interface
   Design System: xIA-Inspired Dark Canvas
   ============================================ */

/* ── Reset & Base ────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Canvas & Surfaces */
  --canvas:        #0a0a0a;
  --canvas-soft:   #1a1c20;
  --canvas-card:   #191919;
  --canvas-mid:    #363a3f;
  --hairline:      #212327;

  /* Text */
  --ink:           #ffffff;
  --ink-hover:     #fafaf7;
  --body:          #dadbdf;
  --body-mid:      #7d8187;

  /* Accents */
  --accent-sunset:   #ff7a17;
  --accent-sunset-soft: #ffc285;
  --accent-dusk:     #7c3aed;
  --accent-twilight: #c4b5fd;
  --accent-breeze:   #a0c3ec;
  --accent-midnight: #0d1726;

  /* Spacing */
  --space-xxs: 2px;
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  12px;
  --space-lg:  16px;
  --space-xl:  24px;
  --space-2xl: 32px;
  --space-3xl: 48px;
  --space-4xl: 64px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-pill: 9999px;

  /* Sidebar */
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 0px;

  /* Transition */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  -webkit-tap-highlight-color: transparent;
}

button,
a,
[role="button"] {
  -webkit-user-select: none;
  user-select: none;
}

button:focus,
[role="button"]:focus {
  outline: none;
}

button:focus-visible,
[role="button"]:focus-visible {
  outline: 2px solid var(--accent-breeze);
  outline-offset: 2px;
}

/* ── Theme Toggle — Circle Reveal Transition ── */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-new(root) {
  z-index: 2;
}

/* ── Light Mode Variables ─────────────────── */
body.light {
  --canvas:        #f5f5f7;
  --canvas-soft:   #eaeaec;
  --canvas-card:   #ffffff;
  --canvas-mid:    #c5c8cd;
  --hairline:      #d6d8dc;

  --ink:           #1a1a1a;
  --ink-hover:     #000000;
  --body:          #333336;
  --body-mid:      #6b6e74;

  --accent-twilight: #6d5acf;
  --accent-midnight: #e8ecf4;
}

body.light .icon-moon { display: none !important; }
body.light .icon-sun  { display: inline-block !important; }

body:not(.light) .icon-moon { display: inline-block !important; }
body:not(.light) .icon-sun  { display: none !important; }

body.light #welcomeLogo svg circle {
  --logo-stroke-1: rgba(0,0,0,0.2);
  --logo-stroke-2: rgba(0,0,0,0.15);
  --logo-stroke-3: rgba(0,0,0,0.1);
  --logo-fill: #1a1a1a;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-weight: 400;
  background-color: var(--canvas);
  color: var(--ink);
  line-height: 1.5;
  overflow: hidden;
  height: 100dvh;
}

body.theme-crossfading {
  transition: background-color 0.6s ease-in-out, color 0.6s ease-in-out,
    border-color 0.6s ease-in-out, background 0.6s ease-in-out !important;
}

body.theme-crossfading *,
body.theme-crossfading *::before,
body.theme-crossfading *::after {
  transition: background-color 0.6s ease-in-out, color 0.6s ease-in-out,
    border-color 0.6s ease-in-out, background 0.6s ease-in-out !important;
}

.theme-crossfading .model-name,
.theme-crossfading .model-option-name,
.theme-crossfading .model-option-desc,
.theme-crossfading .chevron-arrow,
.theme-crossfading .icon-moon,
.theme-crossfading .icon-sun,
.theme-crossfading .uuid-icon-edit,
.theme-crossfading .uuid-icon-check,
.theme-crossfading .check-icon,
.theme-crossfading svg {
  transition: none !important;
}

/* ── App Shell ───────────────────────────── */
.app {
  display: flex;
  height: 100dvh;
  width: 100vw;
  overflow: hidden;
}

/* ── Sidebar Wrapper ─────────────────────── */
.sidebar-wrapper {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  max-width: var(--sidebar-width);
  transition: width var(--transition-base), min-width var(--transition-base), max-width var(--transition-base);
  overflow: hidden;
  /* No z-index here — the wrapper should not create a stacking context.
     Only the open sidebar (and overlay) need explicit stacking. */
}

.sidebar-wrapper.collapsed {
  width: 0;
  min-width: 0;
  max-width: 0;
}

/* ── Sidebar ─────────────────────────────── */
.sidebar {
  width: 100%;
  min-width: var(--sidebar-width);
  height: 100%;
  min-height: 0;
  background-color: var(--canvas);
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  z-index: 10;
}

/* ── Sidebar Header ───────────────────────── */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  min-height: 56px;
}

/* ── Fixed Menu Toggle (Hamburger) ──────────
   Pinned upper-left corner, independent of sidebar layout.
   Menu stays visible even when sidebar collapses or opens (fixed position,
   z-index 150 — above the mobile sidebar, which reaches z-index 100 when open).
   Sized to match the "Chat History" label's ~16px text height (bar 2px × 3 +
   gap 5px × 2 = 16px). Measured: "Chat History" label sits at y:18 height:24,
   so its vertical center is 30px from the top. top: 22px centers the 16px-tall
   toggle (22 + 8 = 30) on that exact line. */
.menu-toggle-fixed {
  position: fixed;
  top: 22px;
  left: 20px;
  z-index: 150;
  width: 20px;
  height: calc(2px * 3 + 5px * 2);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Hamburger from Uiverse.io by vk-uiux */
#checkbox {
  display: none;
}

.toggle {
  position: relative;
  width: 20px;
  cursor: pointer;
  margin: auto;
  display: block;
  height: calc(2px * 3 + 5px * 2);
}

.bar {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: calc(2px / 2);
  background: var(--ink);
  color: inherit;
  opacity: 1;
  transition: none 0.35s cubic-bezier(.5,-0.35,.35,1.5) 0s;
}

/***** Spin Animation *****/
.bar--top {
  bottom: calc(50% + 5px + 2px / 2);
  transition-property: bottom, transform;
  transition-delay: calc(0s + 0.35s), 0s;
}
.bar--middle {
  top: calc(50% - 2px / 2);
  transition-property: opacity;
  transition-delay: calc(0s + 0.35s);
}
.bar--bottom {
  top: calc(50% + 5px + 2px / 2);
  transition-property: top, transform;
  transition-delay: calc(0s + 0.35s), 0s;
}

#checkbox:checked + .toggle .bar--top {
  bottom: calc(50% - 2px / 2);
  transform: rotate(135deg);
  transition-delay: 0s, calc(0s + 0.35s);
}
#checkbox:checked + .toggle .bar--middle {
  opacity: 0;
  transition-duration: 0s;
  transition-delay: calc(0s + 0.35s);
}
#checkbox:checked + .toggle .bar--bottom {
  top: calc(50% - 2px / 2);
  transform: rotate(225deg);
  transition-delay: 0s, calc(0s + 0.35s);
}

/* Remove default blue outline, add subtle focus ring */
#checkbox:focus-visible + .toggle {
  outline: none;
}
#checkbox:focus-visible + .toggle::after {
  content: '';
  position: absolute;
  width: 30px;
  height: 26px;
  border: 2px solid var(--accent-breeze);
  border-radius: 6px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.3px;
}

/* Wraps the section labels + conversation list + empty state. Needs to be
   a column flex container that grows to fill the sidebar's remaining
   height — without this, .sidebar-empty's own flex:1 centering has no
   effect (nothing to center within), which is why the empty state was
   sitting at the top instead of the middle of the sidebar. */
.sidebar-section {
  padding: 0 var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Date-group labels like "TODAY" / "YESTERDAY" above the conversation
   list. This rule was missing entirely, so the label fell back to the
   browser's unstyled default text rendering. */
.section-label {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 400;
  line-height: 16px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--body-mid);
  padding: var(--space-md) var(--space-sm) var(--space-sm);
}

.conversation-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xxs);
  overflow-y: auto;
}

.conversation-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  min-height: 40px;
  white-space: nowrap;
}

.conversation-item:hover {
  background-color: var(--canvas-soft);
}

.conversation-item.active {
  background-color: var(--canvas-soft);
}

.conversation-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--ink);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.conv-icon {
  color: var(--body-mid);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

/* ── Sidebar Empty State ─────────────────────── */
.sidebar-empty {
  display: none;
  flex: 1;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
  color: var(--body-mid);
}

.sidebar-empty svg {
  width: 56px;
  height: 56px;
  stroke-width: 1;
  opacity: 0.35;
}

.sidebar-empty span {
  display: block;
  margin-top: var(--space-lg);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--body);
}

.conversation-item:hover .conv-icon,
.conversation-item.active .conv-icon {
  color: var(--body);
}

.conv-title {
  flex: 1;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
  color: var(--body);
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-fast);
}

.conversation-item:hover .conv-title,
.conversation-item.active .conv-title {
  color: var(--ink);
}

.conv-delete-btn {
  background: transparent;
  border: none;
  color: var(--body-mid);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.conversation-item:hover .conv-delete-btn {
  opacity: 1;
}

.conv-delete-btn:hover {
  color: #ef4444;
  background-color: rgba(239, 68, 68, 0.1);
}

/* Sidebar Footer */
.sidebar-footer {
  margin-top: auto;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--hairline);
  display: flex;
  justify-content: center;
}

.sidebar-footer-btns {
  display: flex;
  align-items: center;
  gap: 16px;
}

.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  color: var(--body-mid);
  font-family: inherit;
  font-size: 13px;
  font-weight: 400;
  line-height: 20px;
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.sidebar-footer-btn:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

/* ── Sidebar Overlay (Mobile) ────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 90;
  backdrop-filter: blur(4px);
}

/* ── Main Content ────────────────────────── */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

/* ── Top Bar ─────────────────────────────── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  min-height: 56px;
  flex-shrink: 0;
  position: relative;
}

.topbar-center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
}

/* ── Right area: share + search buttons ── */
.topbar-actions {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: auto;
}

.model-selector {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  color: var(--body);
  font-family: inherit;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
  position: relative;
  z-index: 100;
}

.model-selector:hover {
  background-color: var(--canvas-soft);
  color: var(--ink);
  border-color: rgba(255, 255, 255, 0.15);
}

.model-selector svg.chevron-arrow {
  transition: transform var(--transition-fast);
}

.model-selector.open svg.chevron-arrow {
  transform: rotate(180deg);
}

.model-dropdown {
  position: fixed;
  top: auto;
  left: 50%;
  transform: translateX(-50%);
  background: var(--canvas-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: var(--space-xs);
  min-width: 260px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: 9999;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.model-dropdown.show {
  opacity: 1;
  visibility: visible;
}

.model-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.model-option:hover {
  background-color: var(--canvas-soft);
}

.model-option.active {
  background-color: rgba(255, 255, 255, 0.06);
}

.model-option.active .check-icon {
  opacity: 1;
}

.model-option-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.model-option-name {
  font-size: 14px;
  font-weight: 400;
  color: var(--ink);
}

.model-option-desc {
  font-size: 12px;
  color: var(--body-mid);
}

.check-icon {
  opacity: 0;
  color: var(--ink);
}

.btn-topbar-action {
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  color: var(--body-mid);
  cursor: pointer;
  padding: var(--space-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  outline: none !important;
  -webkit-focus-ring-color: transparent;
  -webkit-focus-ring-color: transparent !important;
}

.btn-topbar-action:focus {
  outline: none !important;
  box-shadow: none !important;
}

.btn-topbar-action:focus-visible {
  outline: 2px solid var(--accent) !important;
  outline-offset: 2px !important;
}

.btn-topbar-action:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

/* ── Chat Area ───────────────────────────── */
.chat-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

.chat-area::-webkit-scrollbar {
  width: 6px;
}

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

.chat-area::-webkit-scrollbar-thumb {
  background: var(--hairline);
  border-radius: var(--radius-pill);
}

.chat-area::-webkit-scrollbar-thumb:hover {
  background: var(--canvas-mid);
}

/* ── Welcome Screen ──────────────────────── */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4xl) var(--space-xl);
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.welcome-logo {
  margin-bottom: var(--space-2xl);
  animation: pulse-ring 4s ease-in-out infinite;
}

@keyframes pulse-ring {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

.welcome-title {
  font-size: 48px;
  font-weight: 400;
  line-height: 48px;
  letter-spacing: -1.2px;
  color: var(--ink);
  margin-bottom: var(--space-md);
}

.welcome-subtitle {
  font-size: 16px;
  font-weight: 400;
  line-height: 24px;
  color: var(--body-mid);
  margin-bottom: var(--space-3xl);
}

.suggestion-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  width: 100%;
}

.suggestion-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--canvas-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  font-family: inherit;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
  color: var(--body);
  width: 100%;
}

.suggestion-card:hover {
  background: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--ink);
}

.suggestion-card:active {
  transform: scale(0.99);
}

.suggestion-icon {
  color: var(--body-mid);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.suggestion-card:hover .suggestion-icon {
  color: var(--ink);
}

.suggestion-text {
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* ── Chat Messages ───────────────────────── */
.chat-messages {
  padding: var(--space-xl);
  max-width: 768px;
  margin: 0 auto;
  width: 100%;
}

.message {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--hairline);
  animation: fadeInUp 0.3s ease-out;
}

.message:last-child {
  border-bottom: none;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-avatar {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.user-avatar {
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  color: var(--body);
}

.ai-avatar img {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  display: block;
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.message-sender {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.message-body {
  font-size: 15px;
  font-weight: 400;
  line-height: 26px;
  color: var(--body);
}

.message-body p {
  margin-bottom: var(--space-md);
}

.message-body p:last-child {
  margin-bottom: 0;
}

.message-body ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
  list-style: none;
  counter reset: item;
}

.message-body ol li {
  counter-increment: item;
  margin-bottom: var(--space-sm);
  position: relative;
}

.message-body ol li::before {
  content: counter(item) ".";
  position: absolute;
  left: -1.5em;
  color: var(--body-mid);
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}

.message-body strong {
  color: var(--ink);
  font-weight: 500;
}

.message-body code {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 2px 6px;
  color: var(--accent-twilight);
}

/* ── Message Actions ─────────────────────── */
.message-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all var(--transition-fast);
}

.message:hover .message-actions {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.message.actions-visible {
  opacity: 1 !important;
  visibility: visible !important;
  transform: translateY(0) !important;
}

.action-btn {
  background: transparent;
  border: none;
  color: var(--body-mid);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.action-btn:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
}

.action-btn:disabled {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

.action-btn svg {
  pointer-events: none;
}

.sib-count {
  font-family: inherit;
  font-size: 13px;
  font-weight: 400;
  color: var(--body-mid);
  line-height: 20px;
  user-select: none;
  padding: 0 var(--space-xs);
  display: flex;
  align-items: center;
}

.delete-btn {
  margin-left: var(--space-md);
}

.action-spacer {
  width: 1px;
  flex-shrink: 0;
  margin: 0 var(--space-sm);
}

/* ── Input Area ──────────────────────────── */
.input-area {
  padding: var(--space-md) var(--space-xl) var(--space-xl);
  flex-shrink: 0;
  background: linear-gradient(to top, var(--canvas) 60%, transparent);
  position: relative;
}

.input-area-bg-fix {
  transition: background-color 3s ease-in-out !important;
}

.input-container {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: all var(--transition-base);
  max-width: 768px;
  margin: 0 auto;
}

.input-container:focus-within {
  border-color: rgba(255, 255, 255, 0.1);
}

.input-tools {
  display: flex;
  gap: var(--space-xs);
  padding-bottom: var(--space-xs);
}

.btn-tool {
  background: transparent;
  border: none;
  color: var(--body-mid);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-tool:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
}

.input-field {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ink);
  font-family: inherit;
  font-size: 15px;
  font-weight: 400;
  line-height: 24px;
  resize: none;
  min-height: 24px;
  max-height: 200px;
  padding: var(--space-xs) 0;
  -webkit-tap-highlight-color: transparent;
}

.input-field:focus-visible {
  outline: none;
  box-shadow: none;
}

.input-field::placeholder {
  color: var(--body-mid);
}

.input-actions {
  padding-bottom: var(--space-xs);
}

.btn-send {
  background: var(--ink);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--canvas);
  padding: var(--space-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.3;
  pointer-events: none;
}

.btn-send.enabled {
  opacity: 1;
  pointer-events: auto;
  cursor: pointer;
}

.btn-send.enabled:hover {
  background: var(--ink-hover);
  transform: scale(1.05);
}

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

.input-disclaimer {
  text-align: center;
  margin-top: var(--space-md);
  max-width: 768px;
  margin-left: auto;
  margin-right: auto;
}

.input-disclaimer span {
  color: var(--body-mid);
  opacity: 0.7;
}

/* ── Typing Indicator ────────────────────── */
.typing-indicator {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-sm) 0;
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--body-mid);
  border-radius: 50%;
  animation: typingBounce 1.4s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typingBounce {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-6px);
    opacity: 1;
  }
}

/* ── Responsive ──────────────────────────── */
@media (max-width: 768px) {
  .sidebar-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    height: 100dvh;
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    max-width: var(--sidebar-width);
    z-index: 90;
    box-shadow: none;
  }

  /* When open, sidebar wrapper rises above the overlay so footer buttons
     are both visible and clickable (not covered by the dimmed backdrop). */
  .sidebar-wrapper.open {
    z-index: 100;
  }

  .sidebar-wrapper.collapsed {
    width: 0;
  }

  .sidebar {
    border-right: 1px solid var(--hairline);
    overflow-y: auto; /* allow scrolling if conversation list is tall */
  }

  .sidebar-overlay.active {
    display: block;
  }

  /* Align hamburger with the topbar buttons (new chat / theme toggle / model
     selector all measure center at y:30 on mobile). top:22px centers the
     16px-tall toggle (22 + 8 = 30) on that same line. */
  .menu-toggle-fixed {
    top: 22px;
    left: 24px;
  }

  .welcome-title {
    font-size: 32px;
    line-height: 36px;
    letter-spacing: -0.6px;
  }

  .welcome-subtitle {
    font-size: 14px;
  }

  .suggestion-grid {
    grid-template-columns: 1fr;
  }

  .chat-messages {
    padding: var(--space-lg);
  }

  .topbar {
    padding: var(--space-md) var(--space-lg);
  }

  .input-area {
    padding: var(--space-md) var(--space-lg) var(--space-xl);
  }

  .model-option-desc {
    display: none;
  }

  .topbar-center {
    z-index: 1;
  }
}

@media (max-width: 480px) {
  .welcome-title {
    font-size: 28px;
    line-height: 32px;
  }

  .topbar-actions {
    gap: var(--space-sm);
  }

  .btn-tool {
    display: none;
  }

  .menu-toggle-fixed {
    top: 22px;
    left: 24px;
  }
}

/* ── Utility ─────────────────────────────── */
.caption-mono-sm {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  font-weight: 400;
  line-height: 16px;
  letter-spacing: 1.2px;
  color: var(--body-mid);
}

/* ── Selection ───────────────────────────── */
::selection {
  background: rgba(255, 255, 255, 0.15);
  color: var(--ink);
}

button:focus:not(:focus-visible),
input:focus:not(:focus-visible) {
  outline: none;
}

/* ============================================
   Modals — Account / Settings
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-window {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -48%) scale(0.97);
  width: 420px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  background: var(--canvas-card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  z-index: 901;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
}

.modal-window.show {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--hairline);
}

.modal-title {
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.2px;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--body-mid);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
}

.modal-body {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* ── Account Modal ────────────────────────── */
.account-avatar-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.account-avatar-preview {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  overflow: hidden;
  flex-shrink: 0;
}

.account-avatar-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.account-avatar-picker {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.emoji-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-xs);
  width: 100%;
}

.emoji-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 19px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.emoji-btn:hover {
  background-color: var(--canvas-soft);
}

.emoji-btn.active {
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

.avatar-upload-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  color: var(--body);
  font-family: inherit;
  font-size: 13px;
  font-weight: 400;
  padding: var(--space-xs) var(--space-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.avatar-upload-btn:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

.account-uid-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--hairline);
}

.uid-label-group {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.account-uuid-label {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  letter-spacing: 1.2px;
  color: var(--body-mid);
}

.account-uuid-value {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  border-radius: 4px;
  padding: 2px 4px;
  word-break: break-all;
}

.uid-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  flex-shrink: 0;
}

.uid-edit-btn {
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--body-mid);
  cursor: pointer;
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.uid-edit-btn:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

.uid-edit-btn.active {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.2);
}

.uid-switch-btn {
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--body-mid);
  cursor: pointer;
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.uid-switch-btn:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

.uid-lock-btn {
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--body-mid);
  cursor: pointer;
  padding: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.uid-lock-btn:hover {
  color: var(--ink);
  background-color: var(--canvas-soft);
  border-color: rgba(255, 255, 255, 0.15);
}

.uuid-switch-panel,
.uuid-lock-panel {
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.uuid-switch-label,
.uuid-lock-label {
  font-size: 13px;
  color: var(--body-mid);
  line-height: 1.5;
}

.uuid-switch-input,
.uuid-lock-input {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  color: var(--ink);
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  outline: none;
  width: 100%;
  text-align: center;
  letter-spacing: 2px;
  transition: border-color var(--transition-fast);
}

.uuid-switch-input:focus {
  border-color: var(--ink-hover);
}

.uuid-switch-confirm {
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs) var(--space-lg);
  transition: opacity var(--transition-fast);
}

.uuid-switch-confirm:hover {
  opacity: 0.7;
}

.uuid-switch-cancel {
  font-family: inherit;
  font-size: 13px;
  color: var(--body-mid);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  align-self: center;
  transition: color var(--transition-fast);
}

.uuid-switch-cancel:hover {
  color: var(--ink);
}

.uid-lock-confirm,
.uuid-lock-confirm {
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs) var(--space-lg);
  transition: opacity var(--transition-fast);
}

.uid-lock-confirm:hover,
.uuid-lock-confirm:hover {
  opacity: 0.7;
}

.uid-lock-cancel,
.uuid-lock-cancel {
  font-family: inherit;
  font-size: 13px;
  color: var(--body-mid);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  align-self: center;
  transition: color var(--transition-fast);
}

.uid-lock-cancel:hover,
.uuid-lock-cancel:hover {
  color: var(--ink);
}

/* ── Settings Modal ───────────────────────── */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.settings-row-label {
  font-size: 14px;
  color: var(--body);
}

.settings-lang-menu {
  display: flex;
  gap: var(--space-xs);
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  padding: 3px;
}

.lang-option {
  background: transparent;
  border: none;
  border-radius: var(--radius-pill);
  color: var(--body-mid);
  font-family: inherit;
  font-size: 13px;
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-option:hover {
  color: var(--ink);
}

.lang-option.active {
  background-color: var(--canvas-mid);
  color: var(--ink);
}

.settings-theme-menu {
  display: flex;
  gap: var(--space-xs);
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  padding: 3px;
}

.theme-option {
  background: transparent;
  border: none;
  border-radius: var(--radius-pill);
  color: var(--body-mid);
  font-family: inherit;
  font-size: 13px;
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-option:hover {
  color: var(--ink);
}

.theme-option.active {
  background-color: var(--canvas-mid) !important;
  color: var(--ink) !important;
}

.theme-option:not(.active) {
  background-color: transparent !important;
  color: var(--body-mid) !important;
  border-color: transparent !important;
}

.settings-mode-menu {
  display: flex;
  gap: var(--space-xs);
  background: var(--canvas-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  padding: 3px;
}

.mode-option {
  background: transparent;
  border: none;
  border-radius: var(--radius-pill);
  color: var(--body-mid);
  font-family: inherit;
  font-size: 13px;
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-option:hover {
  color: var(--ink);
}

.mode-option.active {
  background-color: var(--canvas-mid) !important;
  color: var(--ink) !important;
}

.mode-option:not(.active) {
  background-color: transparent !important;
  color: var(--body-mid) !important;
  border-color: transparent !important;
}

.settings-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--hairline);
}

.version-text {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  color: var(--body-mid);
}

.changelog-link {
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  color: var(--body-mid);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.changelog-link:hover {
  color: var(--ink);
}

@media (max-width: 480px) {
  .modal-window {
    width: 100%;
  }
}