:root {
  --motion-emphasized: cubic-bezier(0.22, 1, 0.36, 1);
  --motion-snappy: cubic-bezier(0.34, 1.56, 0.64, 1);
  --motion-soft: cubic-bezier(0.25, 0.8, 0.25, 1);
}

.app-shell {
  display: flex;
  height: 100%;
  min-height: 100%;
  overflow: hidden;
}

.sidebar {
  width: 18rem;
  flex: 0 0 18rem;
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.875rem;
  border-right: 1px solid var(--line);
  background: var(--sidebar);
  transition:
    width 320ms var(--motion-emphasized),
    flex-basis 320ms var(--motion-emphasized),
    padding 320ms var(--motion-emphasized),
    border-color 220ms var(--motion-soft);
}

.sidebar.is-collapsed {
  width: 4.5rem;
  flex-basis: 4.5rem;
  padding-inline: 0.5rem;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.sidebar-title-block {
  min-width: 0;
}

.sidebar-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.sidebar-caption,
.panel-caption,
.bubble-role,
.tool-card-label,
.code-line-number,
.conversation-item-primary span,
.conversation-item-secondary {
  color: var(--muted);
}

.sidebar-caption,
.panel-caption,
.conversation-item-secondary,
.conversation-item-primary span,
.tool-card-label {
  font-size: 0.78rem;
}

.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-button,
.send-button,
.download-link,
.conversation-item,
.rail-item,
.chat-composer,
.model-select select {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  transition: border-color 140ms ease, background-color 140ms ease;
}

.toolbar-button,
.send-button,
.rail-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border-radius: 0.45rem;
  cursor: pointer;
}

.toolbar-button:hover,
.send-button:hover,
.download-link:hover,
.conversation-item:hover,
.rail-item:hover,
.chat-composer:hover,
.model-select select:hover,
.tool-card:hover {
  border-color: var(--line-strong);
}

.toolbar-button:disabled,
.send-button:disabled,
.conversation-item:disabled,
.rail-item:disabled {
  opacity: 0.55;
  cursor: default;
}

.conversation-list,
.rail-list,
.chat-timeline {
  min-height: 0;
  overflow: auto;
}

.conversation-list {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.5rem;
}

.conversation-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.4rem;
  align-items: stretch;
}

.conversation-item {
  padding: 0.75rem;
  border-radius: 0.55rem;
  text-align: left;
  cursor: pointer;
}

.conversation-delete-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  opacity: 0;
  transition:
    border-color 140ms ease,
    background-color 140ms ease,
    color 140ms ease,
    opacity 140ms ease;
}

.conversation-row:hover .conversation-delete-button,
.conversation-row:focus-within .conversation-delete-button,
.conversation-row.is-active .conversation-delete-button {
  opacity: 1;
}

.conversation-delete-button:hover {
  border-color: #6e4b49;
  color: #efac9e;
}

.conversation-delete-button:disabled {
  opacity: 0.55;
  cursor: default;
}

.conversation-item.is-active,
.rail-item.is-active {
  border-color: var(--accent-line);
  background: var(--surface-active);
}

.conversation-item-primary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.conversation-item-primary strong {
  font-size: 0.84rem;
  font-weight: 600;
}

.conversation-item-secondary {
  margin-top: 0.2rem;
}

.empty-card {
  padding: 0.85rem;
  border: 1px dashed var(--line);
  border-radius: 0.55rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.rail-list {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.5rem;
}

.rail-item {
  width: 100%;
  height: 2.25rem;
  font-size: 0.78rem;
  text-transform: uppercase;
}

.workspace-shell {
  flex: 1;
  min-width: 0;
  min-height: 0;
  height: 100%;
  padding: 0.875rem;
  overflow: hidden;
}

.workspace-panels,
.main-panel-group,
.workbench-group,
.panel-shell,
.chat-panel-shell,
.workbench-panel,
.workbench-content,
.viewport-panel-content,
.code-panel-content,
.model-canvas-shell {
  min-height: 0;
}

.workspace-panels,
.main-panel-group,
.workbench-group,
.chat-panel-shell {
  height: 100%;
}

.panel-shell {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  height: 100%;
  padding: 0.875rem;
  border: 1px solid var(--line);
  background: var(--surface);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.panel-header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.panel-title-group {
  min-width: 0;
}

.panel-title-group h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.panel-caption {
  margin: 0.1rem 0 0;
}

.model-select {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.artifact-picker {
  min-width: 0;
}

.model-select select {
  padding: 0.45rem 0.6rem;
  border-radius: 0.45rem;
  appearance: none;
  font: inherit;
}

.artifact-picker select {
  max-width: min(22rem, 46vw);
}

.download-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 0.65rem;
  border-radius: 0.45rem;
  text-decoration: none;
  font-size: 0.8rem;
}

.chat-timeline {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 1rem;
  padding-right: 0.1rem;
}

.turn {
  display: grid;
  gap: 0.65rem;
}

.bubble,
.tool-card,
.chat-composer,
.error-banner,
.code-scroll-shell,
.empty-state {
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.bubble,
.tool-card,
.chat-composer,
.error-banner,
.empty-state,
.code-scroll-shell {
  border-radius: 0.55rem;
}

.bubble {
  padding: 0.8rem 0.9rem;
  transition:
    border-color 220ms var(--motion-soft),
    background-color 220ms var(--motion-soft),
    transform 260ms var(--motion-emphasized),
    box-shadow 260ms var(--motion-soft);
}

.bubble-user {
  max-width: min(40rem, 84%);
  justify-self: end;
  background: #161c24;
}

.bubble-assistant {
  max-width: min(46rem, 92%);
}

.bubble-thinking {
  border-style: dashed;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at top left, rgba(143, 197, 255, 0.12), transparent 46%),
    linear-gradient(180deg, rgba(18, 24, 31, 0.92), rgba(14, 19, 25, 0.88));
  animation: thinking-breath 1800ms var(--motion-soft) infinite;
}

.bubble-thinking::after {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(
    105deg,
    transparent 0%,
    transparent 34%,
    rgba(255, 255, 255, 0.03) 48%,
    transparent 62%,
    transparent 100%
  );
  transform: translateX(-120%);
  animation: thinking-sheen 2400ms var(--motion-emphasized) infinite;
  pointer-events: none;
}

.thinking-indicator {
  display: grid;
  gap: 0.45rem;
}

.thinking-indicator-line {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.thinking-indicator-text {
  font-weight: 500;
  letter-spacing: 0.01em;
}

.thinking-indicator-dots {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
}

.thinking-indicator-dot {
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 999px;
  background: rgba(184, 220, 255, 0.92);
  box-shadow: 0 0 0.55rem rgba(143, 197, 255, 0.35);
  animation: thinking-dot-pulse 960ms var(--motion-snappy) infinite;
}

.thinking-indicator-dot:nth-child(2) {
  animation-delay: 120ms;
}

.thinking-indicator-dot:nth-child(3) {
  animation-delay: 240ms;
}

.thinking-indicator p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
  max-width: 34rem;
}

.bubble-role {
  display: inline-block;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
}

.bubble p {
  margin: 0;
  line-height: 1.65;
}

.assistant-sequence {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.markdown-body {
  line-height: 1.7;
  transform-origin: left top;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body pre,
.markdown-body blockquote {
  margin: 0 0 0.85rem;
}

.markdown-body > :last-child {
  margin-bottom: 0;
}

.markdown-body pre,
.tool-card-body pre {
  margin: 0;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: #0f141a;
  overflow: auto;
  font-family: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.tool-card-body pre {
  font-size: 0.74rem;
  line-height: 1.45;
}

.tool-card {
  max-width: min(46rem, 92%);
  overflow: hidden;
  transform-origin: top left;
  transition:
    border-color 240ms var(--motion-soft),
    background-color 240ms var(--motion-soft),
    transform 300ms var(--motion-emphasized),
    box-shadow 300ms var(--motion-soft);
}

.reasoning-card {
  max-width: min(46rem, 92%);
  overflow: hidden;
  border: 1px dashed rgba(143, 197, 255, 0.42);
  border-radius: 0.55rem;
  background: rgba(143, 197, 255, 0.08);
  transform-origin: top left;
  transition:
    border-color 240ms var(--motion-soft),
    background-color 240ms var(--motion-soft),
    transform 300ms var(--motion-emphasized),
    box-shadow 300ms var(--motion-soft);
}

.reasoning-card-summary,
.tool-card-summary,
.tool-nested-summary {
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
}

.reasoning-card-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  list-style: none;
  cursor: pointer;
  padding: 0.7rem 0.85rem;
  transition: padding 260ms var(--motion-emphasized);
}

.reasoning-card-title {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.reasoning-card-title strong {
  font-size: 0.8rem;
  color: #b8dcff;
}

.reasoning-card-body-wrap {
  height: 0;
  opacity: 0;
  transform: translateY(-0.25rem) scaleY(0.985);
  transform-origin: top;
  overflow: hidden;
  will-change: height, opacity, transform;
  transition:
    height 420ms var(--motion-emphasized),
    opacity 260ms var(--motion-soft),
    transform 420ms var(--motion-emphasized);
}

.reasoning-card.is-open .reasoning-card-body-wrap {
  opacity: 1;
  transform: translateY(0) scaleY(1);
}

.reasoning-card-body {
  min-height: 0;
  overflow: hidden;
  padding: 0 0.85rem 0.85rem;
}

.tool-card-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  list-style: none;
  cursor: pointer;
  padding: 0.75rem 0.85rem;
  transition: padding 280ms var(--motion-emphasized);
}

.tool-card.is-open {
  border-color: var(--line-strong);
  box-shadow: 0 18px 36px rgba(6, 10, 14, 0.16);
  transform: translateY(-0.05rem);
}

.tool-card-title-row,
.tool-card-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tool-card-title-row {
  width: 100%;
  justify-content: space-between;
}

.tool-card-title strong {
  font-size: 0.84rem;
}

.tool-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  font-size: 0.74rem;
  color: var(--muted);
}

.tool-status-pill.is-running,
.tool-status-pill.is-pending {
  color: #8fc5ff;
}

.tool-status-pill.is-completed {
  color: #96d7b5;
}

.tool-status-pill.is-error {
  color: #efac9e;
}

.tool-card-chevron {
  color: var(--muted);
  transition: transform 260ms var(--motion-snappy), color 180ms var(--motion-soft);
}

.tool-card.is-open .tool-card-chevron {
  transform: rotate(180deg);
}

.tool-card-body {
  display: grid;
  gap: 0.75rem;
  padding: 0 0.85rem 0.85rem;
}

.tool-card-body-wrap {
  height: 0;
  opacity: 0;
  transform: translateY(-0.25rem) scaleY(0.985);
  transform-origin: top;
  overflow: hidden;
  will-change: height, opacity, transform;
  transition:
    height 420ms var(--motion-emphasized),
    opacity 240ms var(--motion-soft),
    transform 420ms var(--motion-emphasized);
}

.tool-card.is-open .tool-card-body-wrap {
  opacity: 1;
  transform: translateY(0) scaleY(1);
}

.tool-card-body-wrap > .tool-card-body {
  min-height: 0;
  overflow: hidden;
}

.tool-card-section {
  display: grid;
  gap: 0.35rem;
}

.tool-nested-list {
  display: grid;
  gap: 0.45rem;
}

.tool-card-middle-sequence {
  display: grid;
  gap: 0.55rem;
}

.bubble-tool-inline,
.tool-inline-reasoning {
  max-width: 100%;
}

.bubble-tool-inline {
  background: #12171d;
}

.bubble-tool-inline .bubble-role {
  color: #96d7b5;
}

.bubble-tool-inline .markdown-body > :first-child,
.tool-inline-reasoning .markdown-body > :first-child {
  margin-top: 0;
}

.stream-delta {
  display: inline;
  animation: stream-delta-in 900ms var(--motion-emphasized) both;
  will-change: opacity, filter;
}

.tool-nested-item {
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: #12171d;
  overflow: hidden;
}

.tool-nested-item.is-response {
  border-color: rgba(150, 215, 181, 0.32);
  background: rgba(150, 215, 181, 0.08);
}

.tool-nested-item.is-reasoning {
  border-color: rgba(143, 197, 255, 0.34);
  background: rgba(143, 197, 255, 0.08);
}

.tool-nested-item.is-progress {
  border-color: rgba(255, 196, 107, 0.28);
  background: rgba(255, 196, 107, 0.07);
}

.tool-nested-item.is-error {
  border-color: rgba(239, 172, 158, 0.3);
  background: rgba(239, 172, 158, 0.08);
}

.tool-nested-item.is-result {
  border-color: rgba(154, 168, 183, 0.24);
  background: rgba(154, 168, 183, 0.05);
}

.tool-nested-item-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.tool-nested-item-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.tool-nested-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.6rem 0.7rem;
  cursor: pointer;
}

.tool-nested-body-wrap {
  height: 0;
  opacity: 0;
  transform: translateY(-0.2rem) scaleY(0.985);
  transform-origin: top;
  overflow: hidden;
  will-change: height, opacity, transform;
  transition:
    height 360ms var(--motion-emphasized),
    opacity 220ms var(--motion-soft),
    transform 360ms var(--motion-emphasized);
}

.tool-nested-item.is-open .tool-nested-body-wrap {
  opacity: 1;
  transform: translateY(0) scaleY(1);
}

.tool-nested-body {
  min-height: 0;
  overflow: hidden;
  display: grid;
  gap: 0.45rem;
  padding: 0 0.7rem 0.7rem;
}

.tool-nested-chevron {
  color: var(--muted);
  transition: transform 220ms var(--motion-snappy), color 180ms var(--motion-soft);
}

.tool-nested-item.is-open .tool-nested-chevron {
  transform: rotate(180deg);
}

.tool-nested-item-topline strong {
  font-size: 0.78rem;
  font-weight: 600;
}

.tool-nested-item p {
  margin: 0.35rem 0 0;
  font-size: 0.74rem;
  line-height: 1.45;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
}

.tool-nested-block {
  display: grid;
  gap: 0.3rem;
  margin-top: 0.45rem;
}

.tool-nested-block.is-response .tool-card-label {
  color: #96d7b5;
}

.tool-nested-block.is-reasoning .tool-card-label {
  color: #8fc5ff;
}

.tool-nested-block.is-progress .tool-card-label {
  color: #ffc46b;
}

.tool-nested-block.is-error .tool-card-label {
  color: #efac9e;
}

.tool-nested-block pre {
  margin: 0;
  padding: 0.65rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: #0f141a;
  overflow: auto;
  font-family: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  font-size: 0.72rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

.tool-nested-status {
  font-size: 0.72rem;
  color: var(--muted);
}

.tool-nested-status.is-running {
  color: #8fc5ff;
}

.tool-nested-status.is-completed {
  color: #96d7b5;
}

.tool-nested-status.is-error {
  color: #efac9e;
}

.tool-card-label {
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.chat-composer-shell {
  display: grid;
  gap: 0.5rem;
}

.chat-composer-shell.is-dragging-files {
  outline: 1px dashed var(--accent-line);
  outline-offset: 0.25rem;
}

.chat-composer-row {
  display: flex;
  align-items: stretch;
  gap: 0.5rem;
}

.composer-attach-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.composer-attach-button:hover {
  border-color: var(--line-strong);
}

.composer-attach-button input {
  display: none;
}

.composer-image-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.composer-image-item {
  width: 7rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--surface-soft);
  overflow: hidden;
}

.composer-image-item img,
.user-image-preview {
  display: block;
  width: 100%;
  object-fit: cover;
  cursor: zoom-in;
}

.composer-image-item img {
  height: 5rem;
}

.composer-image-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
  padding: 0.45rem 0.5rem;
}

.composer-image-meta span {
  min-width: 0;
  font-size: 0.72rem;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.composer-image-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
}

.composer-image-remove:hover {
  border-color: var(--line-strong);
  color: var(--ink);
}

.user-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(6.5rem, 1fr));
  gap: 0.5rem;
  margin-bottom: 0.65rem;
}

.user-image-preview {
  max-height: 10rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: #10151b;
}

.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background: rgba(9, 12, 16, 0.82);
  backdrop-filter: blur(6px);
}

.image-lightbox-content {
  position: relative;
  max-width: min(92vw, 72rem);
  max-height: min(92vh, 56rem);
  display: grid;
  gap: 0.65rem;
  padding: 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 0.75rem;
  background: #12161c;
}

.image-lightbox-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 22, 28, 0.92);
  color: var(--ink);
  cursor: pointer;
}

.image-lightbox-image {
  max-width: 100%;
  max-height: min(80vh, 48rem);
  border-radius: 0.45rem;
  object-fit: contain;
}

.image-lightbox-caption {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
  text-align: center;
}

.chat-composer {
  flex: 1;
  resize: none;
  min-height: 4.1rem;
  padding: 0.6rem 0.75rem;
  line-height: 1.45;
  font: inherit;
  color: var(--ink);
}

.send-button {
  flex: 0 0 2.75rem;
  width: 2.75rem;
  height: auto;
}

.error-banner {
  padding: 0.7rem 0.8rem;
  color: #f0c0b5;
  background: #211716;
  border-color: #3b2421;
}

.resize-handle {
  position: relative;
  background: transparent;
}

.resize-handle::before {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--line-strong);
}

.resize-handle-vertical {
  width: 0.625rem;
}

.resize-handle-vertical::before {
  width: 1px;
  height: 100%;
}

.resize-handle-horizontal {
  height: 0.625rem;
}

.resize-handle-horizontal::before {
  width: 100%;
  height: 1px;
}

.viewport-panel-content,
.code-panel-content {
  flex: 1;
}

.code-scroll-shell {
  height: 100%;
  overflow: auto;
}

.code-scroll-view {
  margin: 0;
  min-height: 100%;
  padding: 0.75rem 0;
  font-size: 0.82rem;
  font-family: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
}

.code-syntax-view {
  min-height: 100%;
}

.code-syntax-view pre,
.code-syntax-view code {
  font-family: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace !important;
}

.code-syntax-view .linenumber {
  min-width: 2.4rem !important;
}

.model-canvas-shell,
.code-panel-content > div {
  height: 100%;
}

.viewport-empty-state,
.code-empty-state,
.chat-empty-state {
  height: 100%;
}

.empty-state {
  display: grid;
  place-items: center;
  gap: 0.4rem;
  padding: 1.25rem;
  text-align: center;
}

.empty-state.is-clickable {
  width: 100%;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: border-color 140ms ease, background-color 140ms ease;
}

.empty-state.is-clickable:hover {
  border-color: var(--line-strong);
  background: var(--surface-active);
}

.empty-state.is-clickable h3,
.empty-state.is-clickable p {
  pointer-events: none;
}

.empty-state h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
}

.hidden-file-input {
  display: none;
}

.toolbar-button:focus-visible,
.send-button:focus-visible,
.conversation-item:focus-visible,
.conversation-delete-button:focus-visible,
.composer-attach-button:focus-visible,
.composer-image-remove:focus-visible,
.image-lightbox-close:focus-visible,
.rail-item:focus-visible,
.chat-composer:focus-visible,
.tool-card-summary:focus-visible,
.reasoning-card-summary:focus-visible,
.tool-nested-summary:focus-visible,
.model-select select:focus-visible,
.download-link:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 1px;
}

.empty-state.is-clickable:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 1px;
}

.spin {
  animation: spin 1.1s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes stream-delta-in {
  0% {
    opacity: 0;
    filter: blur(9px);
  }

  18% {
    opacity: 0.04;
    filter: blur(8.4px);
  }

  42% {
    opacity: 0.18;
    filter: blur(6.4px);
  }

  72% {
    opacity: 0.64;
    filter: blur(2.6px);
  }

  100% {
    opacity: 1;
    filter: blur(0);
  }
}

@keyframes thinking-breath {
  0%,
  100% {
    border-color: rgba(143, 197, 255, 0.28);
    box-shadow: 0 0 0 rgba(143, 197, 255, 0);
  }

  50% {
    border-color: rgba(143, 197, 255, 0.5);
    box-shadow: 0 0 1.2rem rgba(143, 197, 255, 0.08);
  }
}

@keyframes thinking-dot-pulse {
  0%,
  100% {
    opacity: 0.28;
    transform: translateY(0) scale(0.82);
    filter: blur(0.6px);
  }

  45% {
    opacity: 1;
    transform: translateY(-0.08rem) scale(1.08);
    filter: blur(0);
  }
}

@keyframes thinking-sheen {
  0% {
    transform: translateX(-120%);
    opacity: 0;
  }

  18% {
    opacity: 1;
  }

  58% {
    transform: translateX(120%);
    opacity: 0.7;
  }

  100% {
    transform: translateX(120%);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .bubble,
  .tool-card,
  .reasoning-card,
  .tool-card-summary,
  .reasoning-card-summary,
  .tool-nested-summary,
  .tool-card-chevron,
  .tool-nested-chevron,
  .tool-card-body-wrap,
  .reasoning-card-body-wrap,
  .tool-nested-body-wrap,
  .bubble-thinking,
  .bubble-thinking::after,
  .thinking-indicator-dot,
  .stream-delta {
    transition: none !important;
    animation: none !important;
    transform: none !important;
    filter: none !important;
  }
}

@media (max-width: 1080px) {
  .app-shell {
    flex-direction: column;
  }

  .sidebar,
  .sidebar.is-collapsed {
    width: auto;
    flex-basis: auto;
    height: auto;
  }

  .workspace-shell {
    padding-top: 0;
  }

  .panel-header,
  .chat-composer-row {
    flex-direction: column;
    align-items: stretch;
  }

  .send-button {
    width: 100%;
    flex-basis: auto;
  }
}