.ai-image-preview-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 16px;
}

.ai-image-preview-modal.hidden {
  display: none;
}

.ai-image-preview-backdrop {
  position: absolute;
  inset: 0;
  background: var(--ai-overlay);
  cursor: zoom-out;
}

.ai-image-preview-card {
  position: relative;
  z-index: 1;
  display: flex;
  width: fit-content;
  max-width: min(92vw, 1400px);
  max-height: 92dvh;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--ai-border);
  border-radius: 12px;
  background: var(--ai-surface);
  box-shadow: 0 24px 70px var(--ai-shadow-strong);
}

.ai-image-preview-head,
.ai-image-preview-actions {
  display: flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
}

.ai-image-preview-head {
  border-bottom: 1px solid var(--ai-border-subtle);
  color: var(--ai-text);
}

.ai-image-preview-card > img {
  display: block;
  width: auto;
  height: auto;
  max-width: min(92vw, 1400px);
  max-height: calc(92dvh - 116px);
  object-fit: contain;
  background: var(--ai-code-bg);
}

.ai-image-preview-actions {
  justify-content: flex-end;
  border-top: 1px solid var(--ai-border-subtle);
}

.ai-image-preview-actions a {
  text-decoration: none;
}

.ai-image-preview-close {
  width: 32px;
  min-height: 32px;
  padding: 0;
  font-size: 22px;
  line-height: 1;
}

.ai-chat-shell {
  display: grid;
  padding: 0;
  overflow: visible;
  background: var(--ai-canvas);
}

/* The mobile backdrop is a direct grid child; keep it out of the desktop grid. */
.ai-chat-mobile-settings-backdrop {
  display: none;
}

.ai-chat-layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: calc(100vh - 132px);
  border: 1px solid var(--ai-border-subtle);
  border-radius: 8px;
  background: var(--ai-surface);
  overflow: clip;
}

.ai-chat-sidebar {
  position: sticky;
  top: 12px;
  align-self: start;
  display: grid;
  gap: 12px;
  max-height: calc(100vh - 24px);
  overflow-y: auto;
  border-right: 1px solid var(--ai-border-subtle);
  padding: 14px;
  background: var(--ai-surface-subtle);
}

.ai-chat-side-section {
  display: grid;
  gap: 10px;
  border: 1px solid var(--ai-border-subtle);
  border-radius: 8px;
  padding: 12px;
  background: var(--ai-surface);
  box-shadow: 0 1px 2px var(--ai-shadow-subtle);
}

.ai-chat-side-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.ai-chat-side-head > div {
  display: grid;
  gap: 2px;
}

.ai-chat-side-head > .ai-chat-side-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.ai-chat-side-head strong {
  color: var(--ai-text);
  font-size: 14px;
  font-weight: 800;
}

.ai-chat-session-meta {
  color: var(--ai-text-faint);
  font-size: 11px;
  font-weight: 700;
}

.ai-chat-context-meta {
  min-height: 18px;
  color: var(--ai-text-muted);
  font-size: 12px;
  padding: 4px 0;
}

.ai-chat-compaction-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
  margin: 16px 0 6px;
  border: 1px solid var(--ai-info-border);
  border-radius: 10px;
  padding: 14px;
  background: var(--ai-info-bg);
}

.ai-chat-compaction-card.done {
  border-color: var(--ai-success-border);
  background: var(--ai-success-bg);
}

.ai-chat-compaction-card.stopped {
  border-color: var(--ai-border);
  background: var(--ai-surface-subtle);
}

.ai-chat-compaction-card.error {
  border-color: var(--ai-danger-border);
  background: var(--ai-danger-bg);
}

.ai-chat-compaction-icon {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ai-info-icon-bg);
  color: var(--ai-info-text);
  font-size: 14px;
  font-weight: 900;
}

.ai-chat-compaction-card.done .ai-chat-compaction-icon {
  background: var(--ai-success-icon-bg);
  color: var(--ai-success-text);
}

.ai-chat-compaction-card.stopped .ai-chat-compaction-icon {
  background: var(--ai-surface-muted);
  color: var(--ai-text-muted);
}

.ai-chat-compaction-card.error .ai-chat-compaction-icon {
  background: var(--ai-danger-icon-bg);
  color: var(--ai-danger-text);
}

.ai-chat-compaction-spinner {
  width: 13px;
  height: 13px;
  border: 2px solid var(--ai-info-border);
  border-top-color: var(--ai-info-text);
  border-radius: 50%;
  animation: ai-chat-compaction-spin 0.8s linear infinite;
}

@keyframes ai-chat-compaction-spin {
  to { transform: rotate(360deg); }
}

.ai-chat-compaction-body {
  display: grid;
  min-width: 0;
  gap: 4px;
}

.ai-chat-compaction-body > strong {
  color: var(--ai-text);
  font-size: 14px;
}

.ai-chat-compaction-body > span {
  color: var(--ai-text-muted);
  font-size: 12px;
  line-height: 1.55;
}

.ai-chat-compaction-body details {
  margin-top: 4px;
}

.ai-chat-compaction-body summary {
  width: fit-content;
  color: var(--ai-info-text);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.ai-chat-compaction-summary {
  max-height: 260px;
  margin-top: 8px;
  overflow: auto;
  border-left: 2px solid var(--ai-summary-border);
  padding: 8px 10px;
  background: var(--ai-summary-bg);
  color: var(--ai-text-muted);
  font-size: 12px;
  line-height: 1.65;
}

.ai-chat-compaction-actions {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-chat-context-card {
  border-color: var(--ai-info-border);
  background: var(--ai-info-bg);
}

.ai-chat-context-card.archived {
  border-color: var(--ai-border);
  background: var(--ai-surface-subtle);
}

.ai-chat-context-card.archived .ai-chat-compaction-icon {
  background: var(--ai-surface-muted);
  color: var(--ai-text-muted);
}

.ai-chat-context-card + .ai-chat-message {
  margin-top: 10px;
}

.ai-chat-icon-button {
  width: 34px;
  min-height: 34px;
  padding: 0;
  font-size: 20px;
  line-height: 1;
}

/* Shared dropdown primitives are kept local to the standalone chat app. */
.account-selector {
  position: relative;
}

.account-dropdown {
  position: absolute;
  top: calc(100% + 5px);
  right: 0;
  left: 0;
  z-index: 50;
  display: grid;
  gap: 4px;
  max-height: 320px;
  overflow-y: auto;
  border: 1px solid var(--ai-border);
  border-radius: 8px;
  padding: 6px;
  background: var(--ai-surface);
  box-shadow: 0 14px 36px var(--ai-shadow);
}

.account-dropdown.hidden {
  display: none;
}

.account-option {
  display: grid;
  width: 100%;
  min-width: 0;
  margin: 0;
  border: 1px solid transparent;
  border-radius: 7px;
  padding: 8px 10px;
  background: transparent;
  color: var(--ai-text-secondary);
  text-align: left;
  cursor: pointer;
}

.account-option:hover,
.account-option:focus-visible {
  border-color: var(--ai-border-subtle);
  background: var(--ai-surface-hover);
  color: var(--ai-text);
}

.account-option.muted {
  color: var(--ai-text-muted);
  cursor: default;
}

.ai-chat-session-select-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.ai-chat-session-selector {
  width: 100%;
}

.ai-chat-session-dropdown {
  top: calc(100% + 5px);
  min-width: 100%;
  max-height: 280px;
  overflow-x: hidden;
}

.ai-chat-session-dropdown .account-option.selected {
  border-color: var(--ai-accent-border);
  background: var(--ai-accent-bg);
}

.ai-chat-session-dropdown .account-option {
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  min-height: 54px;
  padding: 9px 10px;
}

.ai-chat-session-dropdown .account-option strong,
.ai-chat-session-dropdown .account-option span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-chat-session-dropdown .account-option strong {
  color: var(--ai-text);
  font-size: 13px;
}

.ai-chat-session-dropdown .account-option span {
  color: var(--ai-text-muted);
  font-size: 12px;
}

.ai-chat-session-dropdown .ai-chat-session-loading {
  min-height: 36px;
  place-items: center;
  text-align: center;
}

.ai-chat-recent-sessions {
  display: grid;
  gap: 7px;
  margin-top: 2px;
}

.ai-chat-recent-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--ai-text-muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.ai-chat-recent-count {
  color: var(--ai-text-faint);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0;
}

.ai-chat-recent-sessions-list {
  display: grid;
  gap: 4px;
  max-height: 226px;
  overflow-y: auto;
  padding-right: 2px;
}

.ai-chat-recent-session {
  display: grid;
  min-width: 0;
  gap: 3px;
  border: 1px solid transparent;
  border-radius: 7px;
  padding: 8px 9px;
  background: transparent;
  color: var(--ai-text-secondary);
  text-align: left;
  cursor: pointer;
}

.ai-chat-recent-session:hover,
.ai-chat-recent-session:focus-visible {
  border-color: var(--ai-border-subtle);
  background: var(--ai-surface-hover);
  color: var(--ai-text);
}

.ai-chat-recent-session.selected {
  border-color: var(--ai-accent-border);
  background: var(--ai-accent-bg);
}

.ai-chat-recent-session strong,
.ai-chat-recent-session span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-chat-recent-session strong {
  color: var(--ai-text);
  font-size: 12px;
}

.ai-chat-recent-session span {
  color: var(--ai-text-muted);
  font-size: 11px;
}

.ai-chat-recent-empty {
  padding: 5px 2px;
  color: var(--ai-text-faint);
  font-size: 11px;
}

.ai-chat-recent-pagination {
  padding: 7px 2px;
  text-align: center;
}

.ai-chat-field {
  display: grid;
  gap: 5px;
  margin: 0;
  color: var(--ai-text-muted);
  font-size: 12px;
  font-weight: 700;
}

.ai-chat-field select,
.ai-chat-field input,
.ai-chat-field textarea {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--ai-border);
  border-radius: 7px;
  padding: 8px 10px;
  background: var(--ai-surface);
  color: var(--ai-text);
  font: inherit;
}

.ai-chat-field select {
  padding-right: 28px;
}

.ai-chat-session-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.ai-chat-export-menu {
  position: relative;
}

.ai-chat-export-menu > button {
  width: 100%;
}

.ai-chat-export-icon-menu > button {
  width: 34px;
}

.ai-chat-download-icon-button {
  display: inline-grid;
  place-items: center;
  cursor: pointer;
}

.ai-chat-download-icon-button:focus-visible {
  outline: 2px solid var(--ai-accent);
  outline-offset: 2px;
}

.ai-chat-download-icon-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.ai-chat-export-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  display: grid;
  min-width: 156px;
  gap: 4px;
  border: 1px solid var(--ai-border);
  border-radius: 8px;
  padding: 6px;
  background: var(--ai-surface);
  box-shadow: 0 14px 36px var(--ai-shadow);
}

.ai-chat-export-dropdown.hidden {
  display: none;
}

.ai-chat-export-dropdown button {
  min-height: 34px;
  margin: 0;
  border: 0;
  border-radius: 6px;
  padding: 7px 10px;
  background: transparent;
  color: var(--ai-text-secondary);
  text-align: left;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.ai-chat-export-dropdown button:hover {
  background: var(--ai-surface-hover);
}

.ai-chat-capability-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
}

.ai-chat-capability-toggle {
  position: relative;
  display: flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid var(--ai-border);
  border-radius: 7px;
  padding: 7px 8px;
  background: var(--ai-surface-subtle);
  color: var(--ai-text-muted);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
}

.ai-chat-capability-toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.ai-chat-capability-toggle:has(input:checked) {
  border-color: var(--ai-accent-border);
  background: var(--ai-accent-bg);
  color: var(--ai-accent-strong);
}

.ai-chat-capability-toggle:has(input:focus-visible) {
  outline: 2px solid var(--ai-accent);
  outline-offset: 2px;
}

.ai-chat-capability-icon {
  display: grid;
  width: 16px;
  height: 16px;
  place-items: center;
}

.ai-chat-capability-icon svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.ai-chat-number-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.ai-chat-more-settings {
  overflow: hidden;
  border: 1px solid var(--ai-border-subtle);
  border-radius: 8px;
  background: var(--ai-surface-subtle);
}

.ai-chat-more-settings > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 38px;
  padding: 0 10px;
  color: var(--ai-text-secondary);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  list-style: none;
}

.ai-chat-more-settings > summary::-webkit-details-marker {
  display: none;
}

.ai-chat-more-settings > summary::after {
  content: "›";
  color: var(--ai-text-muted);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  transition: transform 0.15s ease;
}

.ai-chat-more-settings[open] > summary {
  border-bottom: 1px solid var(--ai-border-subtle);
}

.ai-chat-more-settings[open] > summary::after {
  transform: rotate(90deg);
}

.ai-chat-more-settings-content {
  display: grid;
  gap: 10px;
  padding: 10px;
}

.ai-chat-system-prompt textarea {
  min-height: 76px;
  resize: vertical;
}

.ai-chat-template-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: end;
}

.ai-chat-clear-button {
  width: 100%;
}

.ai-chat-main {
  display: grid;
  grid-template-rows: minmax(420px, 1fr) auto auto auto;
  min-width: 0;
  min-height: calc(100vh - 132px);
  padding: 16px 18px 0;
  background: var(--ai-main);
}

.ai-chat-bootstrap-state {
  display: grid;
  min-height: 120px;
  place-items: center;
  align-content: center;
  gap: 10px;
  color: var(--ai-text-muted);
  font-size: 13px;
  text-align: center;
}

.ai-chat-bootstrap-state::before {
  width: 18px;
  height: 18px;
  border: 2px solid var(--ai-border-strong);
  border-top-color: var(--ai-accent);
  border-radius: 50%;
  content: "";
  animation: ai-chat-bootstrap-spin .8s linear infinite;
}

.ai-chat-bootstrap-state.error {
  color: var(--ai-danger-text);
}

.ai-chat-bootstrap-state.error::before {
  display: none;
}

@keyframes ai-chat-bootstrap-spin {
  to { transform: rotate(360deg); }
}

.ai-chat-empty-state {
  display: grid;
  justify-items: center;
  align-content: center;
  min-height: min(520px, 62vh);
  gap: 12px;
  padding: 48px 24px;
  color: var(--ai-text-muted);
  text-align: center;
}

.ai-chat-empty-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border: 1px solid var(--ai-accent-border);
  border-radius: 16px;
  background: var(--ai-accent-bg);
  color: var(--ai-accent);
  font-size: 25px;
  box-shadow: 0 12px 32px var(--ai-shadow);
}

.ai-chat-empty-state h2 {
  margin: 4px 0 0;
  color: var(--ai-text);
  font-size: clamp(20px, 2vw, 26px);
  letter-spacing: -.03em;
}

.ai-chat-empty-state p {
  max-width: 560px;
  margin: 0;
  color: var(--ai-text-muted);
  font-size: 13px;
  line-height: 1.7;
}

.ai-chat-starters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.ai-chat-starter {
  min-height: 36px;
  border: 1px solid var(--ai-border);
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--ai-surface-subtle);
  color: var(--ai-text-secondary);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .16s ease, background-color .16s ease, transform .16s ease;
}

.ai-chat-starter:hover {
  border-color: var(--ai-accent-border);
  background: var(--ai-accent-bg);
  transform: translateY(-1px);
}

.ai-chat-messages {
  display: grid;
  align-content: start;
  gap: 12px;
  overflow: visible;
  min-width: 0;
  min-height: 0;
  padding: 4px 0 18px;
}

.ai-chat-message {
  display: grid;
  gap: 5px;
  width: min(1120px, 100%);
  max-width: 100%;
  min-width: 0;
  justify-self: center;
}

.ai-chat-message.user {
  width: min(760px, 72%);
  justify-self: end;
}

.ai-chat-message.error .ai-chat-content {
  border-color: var(--ai-danger-border);
  background: var(--ai-danger-bg);
}

.ai-chat-message.stopped .ai-chat-content {
  border-color: var(--ai-warning-border);
  background: var(--ai-warning-bg);
}

.ai-chat-message-head {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-chat-message-actions {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
}

@media (min-width: 721px) {
  .ai-chat-message-actions {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-2px);
    transition: opacity .16s ease, transform .16s ease;
  }

  .ai-chat-message:hover .ai-chat-message-actions,
  .ai-chat-message:focus-within .ai-chat-message-actions {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
}

.ai-chat-version-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--ai-text-muted);
  font-size: 12px;
}

.ai-chat-version-button {
  min-width: 28px;
  padding: 3px 6px;
}

.ai-chat-action-button {
  display: inline-grid;
  place-items: center;
  width: 30px;
  min-width: 30px;
  min-height: 30px;
  padding: 0;
  border-color: transparent;
  background: transparent;
  color: var(--ai-text-muted);
}

.ai-chat-action-button:hover {
  border-color: var(--ai-border);
  background: var(--ai-surface-muted);
  color: var(--ai-text-secondary);
}

.ai-chat-action-button.danger-soft {
  color: var(--ai-danger-text);
}

.ai-chat-action-button.danger-soft:hover {
  border-color: var(--ai-danger-border);
  background: var(--ai-danger-bg);
  color: var(--ai-danger-text-strong);
}

.ai-chat-action-button.success-soft {
  border-color: var(--ai-success-border);
  background: var(--ai-success-bg);
  color: var(--ai-success-text);
}

.ai-chat-action-button svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ai-chat-role {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--ai-text-muted);
  font-size: 12px;
  font-weight: 800;
}

.ai-chat-role span {
  color: var(--ai-text-faint);
  font-weight: 700;
}

.ai-chat-message.user .ai-chat-role {
  text-align: right;
}

.ai-chat-content {
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  padding: 10px 12px;
  border: 1px solid var(--ai-border-subtle);
  border-radius: 8px;
  background: var(--ai-surface);
  color: var(--ai-text);
  line-height: 1.55;
  word-break: break-word;
}

.ai-chat-message.user .ai-chat-content {
  border-color: var(--ai-accent-border);
  background: var(--ai-accent-bg-soft);
}

.ai-chat-content.streaming {
  white-space: normal;
}

.ai-chat-content .katex-display {
  display: block;
  max-width: 100%;
  margin: 0.6em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.08em 0;
}

.ai-chat-usage {
  margin-top: 6px;
  color: var(--ai-text-muted);
  font-size: 12px;
}

.ai-chat-stream-stable:empty {
  display: none;
}

.ai-chat-stream-tail {
  min-height: 1.55em;
}

.ai-chat-stream-caret {
  display: inline-block;
  width: 7px;
  height: 1.15em;
  margin-left: 2px;
  border-radius: 2px;
  background: var(--accent-strong);
  vertical-align: -0.18em;
  animation: ai-chat-caret-pulse 0.9s ease-in-out infinite;
}

@keyframes ai-chat-caret-pulse {
  0%, 100% {
    opacity: 0.25;
  }

  50% {
    opacity: 1;
  }
}

.ai-chat-content p,
.ai-chat-content ul,
.ai-chat-content ol,
.ai-chat-content blockquote,
.ai-chat-content pre {
  margin: 0 0 10px;
}

.ai-chat-content p:last-child,
.ai-chat-content ul:last-child,
.ai-chat-content ol:last-child,
.ai-chat-content blockquote:last-child,
.ai-chat-content pre:last-child {
  margin-bottom: 0;
}

.ai-chat-content ul,
.ai-chat-content ol {
  padding-left: 20px;
}

.ai-chat-content li + li {
  margin-top: 4px;
}

.ai-chat-content li.ai-chat-task {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  list-style: none;
  margin-left: -20px;
}

.ai-chat-content li.ai-chat-task input {
  width: 14px;
  height: 14px;
  margin-top: 4px;
}

.ai-chat-content del {
  color: var(--ai-text-muted);
}

.ai-chat-content h1,
.ai-chat-content h2,
.ai-chat-content h3,
.ai-chat-content h4,
.ai-chat-content h5,
.ai-chat-content h6 {
  margin: 12px 0 6px;
  color: var(--ai-text-strong);
  line-height: 1.4;
}

.ai-chat-content h1 {
  font-size: 18px;
}

.ai-chat-content h2 {
  font-size: 16px;
}

.ai-chat-content h3,
.ai-chat-content h4,
.ai-chat-content h5,
.ai-chat-content h6 {
  font-size: 14px;
}

.ai-chat-content h1:first-child,
.ai-chat-content h2:first-child,
.ai-chat-content h3:first-child,
.ai-chat-content h4:first-child,
.ai-chat-content h5:first-child,
.ai-chat-content h6:first-child {
  margin-top: 0;
}

.ai-chat-content blockquote {
  padding-left: 10px;
  border-left: 3px solid var(--ai-border-strong);
  color: var(--ai-text-muted);
}

.ai-chat-content pre {
  overflow-x: auto;
  padding: 10px;
  border-radius: 7px;
  background: var(--ai-code-bg);
  color: var(--ai-code-text);
  white-space: pre;
}

.ai-chat-content code {
  border-radius: 5px;
  padding: 2px 5px;
  background: var(--ai-code-inline-bg);
  color: var(--ai-text-strong);
  font-family: Consolas, "SFMono-Regular", monospace;
  font-size: 0.92em;
}

.ai-chat-content pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.ai-chat-content a {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.ai-chat-table-wrap {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  margin: 0 0 10px;
}

.ai-chat-table-wrap:last-child {
  margin-bottom: 0;
}

.ai-chat-content table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  font-size: 13px;
}

.ai-chat-content th,
.ai-chat-content td {
  border: 1px solid var(--ai-border-strong);
  padding: 7px 8px;
  text-align: left;
  vertical-align: top;
}

.ai-chat-content th {
  background: var(--ai-surface-hover);
  color: var(--ai-text-secondary);
  font-weight: 800;
}

.ai-chat-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 8px 0;
  border-radius: 6px;
}

.ai-chat-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.ai-chat-business-context {
  display: grid;
  gap: 3px;
  margin-top: 8px;
  border: 1px solid var(--ai-border);
  border-radius: 7px;
  padding: 8px 10px;
  background: var(--ai-surface-subtle);
  color: var(--ai-text-muted);
  font-size: 12px;
}

.ai-chat-business-context strong {
  color: var(--ai-text);
}

.ai-chat-search-sources {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  border-top: 1px solid var(--ai-border-subtle);
  padding-top: 10px;
  color: var(--ai-text-muted);
  font-size: 12px;
}

.ai-chat-search-sources strong {
  color: var(--ai-text-secondary);
  font-size: 12px;
}

.ai-chat-search-sources a {
  display: grid;
  gap: 2px;
  color: var(--ai-link);
  text-decoration: none;
}

.ai-chat-search-sources a:hover span {
  text-decoration: underline;
}

.ai-chat-search-sources small,
.ai-chat-search-sources em {
  overflow-wrap: anywhere;
  color: var(--ai-text-muted);
  font-style: normal;
}

.ai-chat-attachments img,
.ai-chat-attachment-chip img {
  width: 96px;
  height: 96px;
  object-fit: cover;
  border: 1px solid var(--ai-border-subtle);
  border-radius: 7px;
  background: var(--ai-surface);
}

.ai-chat-pending-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: min(1120px, 100%);
  justify-self: center;
  padding: 2px 0;
}

.ai-chat-pending-context {
  width: min(1120px, 100%);
  justify-self: center;
}

.ai-chat-context-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--ai-border);
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--ai-surface-subtle);
}

.ai-chat-context-chip strong {
  color: var(--ai-text);
  font-size: 13px;
}

.ai-chat-context-chip span {
  overflow: hidden;
  flex: 1;
  color: var(--ai-text-muted);
  font-size: 12px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-chat-attachment-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 260px;
  border: 1px solid var(--ai-border);
  border-radius: 8px;
  padding: 6px;
  background: var(--ai-surface);
}

.ai-chat-attachment-chip span {
  overflow: hidden;
  color: var(--ai-text-secondary);
  font-size: 12px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-chat-input-row {
  position: sticky;
  bottom: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 88px;
  gap: 12px;
  align-items: stretch;
  width: min(1120px, 100%);
  justify-self: center;
  border-top: 1px solid var(--ai-border-subtle);
  padding: 12px 0 14px;
  background: linear-gradient(180deg, var(--ai-input-gradient-start), var(--ai-main) 28%);
}

.ai-chat-input-row.ai-chat-drop-active::after {
  content: "释放即可添加图片或文件";
  position: absolute;
  inset: 4px;
  z-index: 2;
  display: grid;
  place-items: center;
  border: 2px dashed var(--ai-accent);
  border-radius: 9px;
  background: var(--ai-drop-bg);
  color: var(--ai-accent-strong);
  font-size: 14px;
  font-weight: 800;
  pointer-events: none;
}

.ai-chat-attachment-menu {
  position: relative;
}

.ai-chat-plus-button {
  width: 50px;
  min-height: 50px;
  padding: 0;
  border-radius: 8px;
  color: var(--ai-accent-strong);
  font-size: 24px;
  font-weight: 900;
  line-height: 1;
}

.ai-chat-attachment-dropdown {
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  z-index: 40;
  display: grid;
  gap: 4px;
  min-width: 148px;
  border: 1px solid var(--ai-border);
  border-radius: 8px;
  padding: 6px;
  background: var(--ai-surface);
  box-shadow: 0 14px 36px var(--ai-shadow);
}

.ai-chat-attachment-dropdown.hidden {
  display: none;
}

.ai-chat-attachment-option,
.ai-chat-attachment-dropdown button {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 34px;
  margin: 0;
  border: 0;
  border-radius: 6px;
  padding: 7px 10px;
  background: transparent;
  color: var(--ai-text-secondary);
  text-align: left;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.ai-chat-attachment-option:hover,
.ai-chat-attachment-dropdown button:hover {
  background: var(--ai-surface-hover);
}

.ai-chat-attachment-option input {
  display: none;
}

.ai-chat-input-row button.danger {
  border-color: var(--ai-danger-border);
  background: var(--ai-danger-bg);
  color: var(--danger);
}

.ai-chat-edit-input {
  width: 100%;
  min-height: 90px;
  max-height: 220px;
  resize: none;
  overflow-y: auto;
  border-color: var(--ai-accent-border);
  background: var(--ai-surface);
}

.ai-chat-input-row textarea {
  width: 100%;
  min-height: 44px;
  max-height: 180px;
  border: 1px solid var(--ai-border);
  border-radius: 8px;
  padding: 12px;
  background: var(--ai-surface);
  resize: none;
  overflow-y: auto;
}

.ai-chat-input-row > button[type="submit"] {
  min-height: 50px;
  border-color: var(--ai-accent-strong);
  background: var(--ai-accent-strong);
  color: var(--ai-on-accent);
  font-weight: 900;
}

.ai-chat-reasoning-settings {
  display: grid;
  gap: 8px;
  margin-top: 2px;
  padding: 10px;
  border: 1px solid var(--ai-border-subtle);
  border-radius: 8px;
  background: var(--ai-surface-subtle);
}

.ai-chat-reasoning-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.ai-chat-reasoning-title strong {
  color: var(--ai-text-secondary);
  font-size: 13px;
}

.ai-chat-reasoning-title span {
  color: var(--ai-text-faint);
  font-size: 11px;
}

.ai-chat-reasoning-title output {
  color: var(--ai-accent-strong);
  font-size: 12px;
  font-weight: 800;
}

.ai-chat-reasoning-slider {
  width: 100%;
  height: 20px;
  margin: 2px 0 0;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

.ai-chat-reasoning-slider::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    var(--ai-accent) 0,
    var(--ai-accent) var(--ai-reasoning-progress, 0%),
    var(--ai-border) var(--ai-reasoning-progress, 0%),
    var(--ai-border) 100%
  );
}

.ai-chat-reasoning-slider::-webkit-slider-thumb {
  width: 18px;
  height: 18px;
  margin-top: -6px;
  appearance: none;
  border: 2px solid var(--ai-surface);
  border-radius: 50%;
  background: var(--ai-accent-strong);
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.25);
}

.ai-chat-reasoning-slider:focus-visible {
  outline: 2px solid var(--ai-accent);
  outline-offset: 3px;
  border-radius: 999px;
}

.ai-chat-reasoning-scale {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  margin-top: -4px;
  color: var(--ai-text-faint);
  font-size: 10px;
  line-height: 1.2;
  text-align: center;
}

.ai-chat-reasoning-scale span:first-child {
  text-align: left;
}

.ai-chat-reasoning-scale span:last-child {
  text-align: right;
}

.ai-chat-reasoning-output {
  margin-top: 8px;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--ai-border-strong);
  border-radius: 8px;
  background: var(--ai-surface-subtle);
  color: var(--ai-text-muted);
}

.ai-chat-reasoning-output summary {
  cursor: pointer;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 700;
}

.ai-chat-reasoning-output > div {
  padding: 0 10px 10px;
  font-size: 13px;
  line-height: 1.65;
  overflow-wrap: anywhere;
  word-break: break-word;
  white-space: pre-wrap;
}

.ai-chat-reasoning-status {
  margin: 8px 10px;
  color: var(--ai-text-muted);
  font-size: 12px;
  line-height: 1.5;
}

.ai-chat-toolbar,
.mobile-ai-settings-close {
  display: none;
}

.ai-chat-jump-nav {
  position: fixed;
  top: 50%;
  right: 34px;
  z-index: 25;
  display: none;
  width: 22px;
  max-height: min(52vh, 460px);
  transform: translateY(-50%);
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 6px 0;
  background: transparent;
  box-shadow: none;
  transition: width 0.16s ease, padding 0.16s ease, background-color 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.ai-chat-jump-nav.has-items {
  display: block;
}

.ai-chat-jump-nav:is(:hover, :focus-within) {
  width: min(220px, 18vw);
  border-color: var(--ai-border);
  padding: 6px;
  background: color-mix(in srgb, var(--ai-surface) 94%, transparent);
  box-shadow: 0 10px 28px var(--ai-shadow);
  backdrop-filter: blur(12px);
}

.ai-chat-jump-items {
  display: grid;
  gap: 2px;
  max-height: min(52vh, 460px);
  overflow-y: auto;
  overflow-x: hidden;
}

.ai-chat-jump-item {
  display: grid;
  grid-template-columns: 18px 0;
  align-items: center;
  justify-content: end;
  gap: 0;
  min-width: 0;
  min-height: 13px;
  border: 0;
  border-radius: 6px;
  padding: 2px 0;
  background: transparent;
  color: var(--ai-text-muted);
  text-align: left;
  font: inherit;
  font-size: 11px;
  cursor: pointer;
}

.ai-chat-jump-nav:is(:hover, :focus-within) .ai-chat-jump-item {
  grid-template-columns: 8px minmax(0, 1fr);
  justify-content: stretch;
  gap: 7px;
  min-height: 30px;
  padding: 5px 7px;
}

.ai-chat-jump-nav:is(:hover, :focus-within) .ai-chat-jump-item:hover,
.ai-chat-jump-nav:is(:hover, :focus-within) .ai-chat-jump-item.active {
  background: var(--ai-surface-hover);
  color: var(--ai-text);
}

.ai-chat-jump-nav:is(:hover, :focus-within) .ai-chat-jump-item.active {
  box-shadow: inset 2px 0 var(--ai-accent);
}

.ai-chat-jump-dot {
  width: 14px;
  height: 2px;
  justify-self: end;
  border-radius: 2px;
  background: var(--ai-border);
  transition: width 0.16s ease, height 0.16s ease, background-color 0.16s ease;
}

.ai-chat-jump-item.active .ai-chat-jump-dot {
  width: 18px;
  background: var(--ai-accent);
}

.ai-chat-jump-nav:is(:hover, :focus-within) .ai-chat-jump-dot {
  width: 6px;
  height: 6px;
  justify-self: center;
  border-radius: 50%;
}

.ai-chat-jump-label {
  overflow: hidden;
  max-width: 0;
  opacity: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition: opacity 0.12s ease;
}

.ai-chat-jump-nav:is(:hover, :focus-within) .ai-chat-jump-label {
  max-width: none;
  opacity: 1;
}

@media (max-width: 980px) {

  .ai-chat-layout,
  .ai-chat-input-row {
    grid-template-columns: 1fr;
  }

  .ai-chat-compaction-card {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .ai-chat-compaction-card > button {
    grid-column: 1 / -1;
    width: 100%;
  }

  .ai-chat-compaction-actions {
    grid-column: 1 / -1;
  }

  .ai-chat-compaction-actions > button {
    flex: 1;
  }

  .ai-chat-layout {
    min-height: auto;
    overflow: visible;
  }

  .ai-chat-jump-nav {
    right: 28px;
  }

  .ai-chat-jump-nav:is(:hover, :focus-within) {
    width: min(190px, 24vw);
  }

  .ai-chat-sidebar {
    position: static;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--ai-border-subtle);
  }

  .ai-chat-main {
    min-height: 520px;
    padding: 12px;
  }

  .ai-chat-session-actions,
  .ai-chat-number-grid {
    grid-template-columns: 1fr;
  }

  .ai-chat-message,
  .ai-chat-message.user {
    width: 100%;
    max-width: 100%;
  }}

@media (max-width: 720px) {

  .ai-chat-layout {
    min-height: auto;
  }

  .ai-chat-jump-nav {
    display: none !important;
  }

  .ai-chat-sidebar {
    display: none;
    max-height: none;
    padding: 12px;
  }

  .ai-chat-mobile-settings-backdrop {
    position: fixed;
    inset: 0;
    z-index: 40;
    display: none;
    width: 100%;
    border: 0;
    padding: 0;
    background: var(--ai-overlay);
    cursor: pointer;
  }

  body.ai-chat-mobile-settings-locked {
    overflow: hidden;
  }

  .ai-chat-layout.ai-chat-mobile-settings-open .ai-chat-mobile-settings-backdrop {
    display: block;
  }

  .ai-chat-layout.ai-chat-mobile-settings-open .ai-chat-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 41;
    display: grid;
    width: min(340px, calc(100vw - 32px));
    max-height: 100dvh;
    overflow-y: auto;
    border-right: 1px solid var(--ai-border-strong);
    border-bottom: 0;
    box-shadow: 18px 0 48px var(--ai-shadow-strong);
  }

  .ai-chat-toolbar {
    display: flex;
    justify-content: flex-end;
    padding-bottom: 8px;
  }

  .ai-chat-toolbar button {
    min-height: 40px;
    font-size: 14px;
  }

  .ai-chat-sidebar-toggle {
    display: none;
  }

  .mobile-ai-settings-close {
    display: block;
    width: 100%;
  }

  .ai-chat-main {
    grid-template-rows: auto minmax(280px, 1fr) auto auto auto auto;
    min-height: calc(100dvh - 154px);
    padding: 10px 12px 0;
  }

  .ai-chat-input-row {
    grid-template-columns: 44px minmax(0, 1fr) 64px;
    gap: 8px;
    padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
  }

  .ai-chat-plus-button,
  .ai-chat-input-row > button[type="submit"] {
    min-height: 44px;
  }

  .ai-chat-plus-button {
    width: 44px;
  }

  .ai-chat-input-row textarea {
    min-height: 44px;
    padding: 10px;
  }}

@media (min-width: 981px) {
  html,
  body {
    height: 100%;
  }

  body {
    overflow: hidden;
  }

  .app-main,
  .app-main > .view,
  #aiChatForm,
  .ai-chat-shell,
  .ai-chat-layout {
    min-height: 0;
  }

  .app-main {
    height: calc(100dvh - 140px);
  }

  .app-main > .view,
  #aiChatForm,
  .ai-chat-shell,
  .ai-chat-layout {
    height: 100%;
  }

  .ai-chat-layout {
    overflow: hidden;
  }

  .ai-chat-sidebar {
    position: static;
    height: 100%;
    max-height: none;
    min-height: 0;
  }

  .ai-chat-main {
    height: 100%;
    min-height: 0;
    grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  }

  .ai-chat-toolbar {
    display: flex;
    justify-content: flex-end;
    padding-bottom: 8px;
  }

  .ai-chat-sidebar-toggle {
    min-height: 34px;
    font-size: 12px;
  }

  .ai-chat-layout.ai-chat-sidebar-collapsed {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  .ai-chat-layout.ai-chat-sidebar-collapsed .ai-chat-sidebar {
    min-width: 0;
    overflow: hidden;
    border-right: 0;
    padding: 0;
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
  }

  .ai-chat-messages {
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
  }
}

/* Conversation-first chat surface. Keep existing IDs and behavior contracts intact. */
.ai-chat-shell { min-height: 0; height: 100%; border: 0; border-radius: 0; background: var(--ai-canvas); }
.ai-chat-layout { grid-template-columns: 280px minmax(0, 1fr); min-height: 0; height: 100%; border: 0; border-radius: 0; background: var(--ai-main); }
.ai-chat-sidebar { position: static; height: 100%; max-height: none; gap: 0; border-right: 1px solid var(--ai-border-subtle); padding: 18px 12px 12px; background: var(--ai-surface-subtle); }
.ai-chat-side-section { gap: 14px; border: 0; border-radius: 0; padding: 0 4px; background: transparent; box-shadow: none; }
.ai-chat-session-menu { min-height: 0; grid-template-rows: auto auto minmax(0, 1fr) auto; }
.ai-chat-section-kicker { display: block; margin-bottom: 4px; color: var(--ai-text-faint); font-size: 9px; font-weight: 900; letter-spacing: .14em; }
.ai-chat-side-head strong { font-size: 14px; }
.ai-chat-new-button { min-height: 34px; padding: 7px 10px; border-color: var(--ai-accent-border); border-radius: 8px; background: var(--ai-accent-bg); color: var(--ai-text); font-size: 12px; font-weight: 800; }
.ai-chat-new-button:hover { background: var(--ai-accent-bg-soft); }
.ai-chat-new-button span { margin-left: 3px; }
.ai-chat-search-field { position: relative; display: flex; align-items: center; gap: 7px; min-height: 38px; border: 1px solid var(--ai-border-subtle); border-radius: 9px; padding: 0 8px; background: var(--ai-surface); }
.ai-chat-search-field:focus-within { border-color: var(--ai-accent-border); box-shadow: 0 0 0 3px var(--ai-accent-bg-soft); }
.ai-chat-search-field input { min-width: 0; min-height: 34px; border: 0; padding: 6px 0; background: transparent; outline: 0; }
.ai-chat-search-field kbd { flex: none; border: 1px solid var(--ai-border-subtle); border-radius: 4px; padding: 2px 4px; color: var(--ai-text-faint); font-size: 10px; }
.ai-chat-search-icon { color: var(--ai-text-muted); font-size: 20px; line-height: 1; }
.ai-chat-recent-sessions { min-height: 0; margin-top: 5px; }
.ai-chat-recent-sessions-list { max-height: none; min-height: 0; padding-right: 0; }
.ai-chat-recent-session { border-radius: 8px; padding: 10px; }
.ai-chat-recent-session strong { font-size: 12px; }
.ai-chat-recent-session span { font-size: 10px; }
.ai-chat-session-actions { padding-top: 10px; border-top: 1px solid var(--ai-border-subtle); }
.ai-chat-sidebar-footer { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: auto; padding: 14px 4px 0; border-top: 1px solid var(--ai-border-subtle); color: var(--ai-text-faint); font-size: 10px; }
.ai-chat-sidebar-status { display: inline-flex; align-items: center; gap: 5px; }
.ai-chat-sidebar-status .status-dot { width: 6px; height: 6px; }
.ai-chat-main { grid-template-rows: auto minmax(0, 1fr) auto auto auto; min-height: 0; height: 100%; padding: 0 28px; background: var(--ai-main); }
.ai-chat-toolbar { display: flex; align-items: center; justify-content: space-between; min-height: 58px; padding: 8px 0; border-bottom: 1px solid var(--ai-border-subtle); }
.ai-chat-toolbar-title { display: grid; min-width: 0; gap: 2px; }
.ai-chat-toolbar-kicker { color: var(--ai-text-faint); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.ai-chat-toolbar-title strong { overflow: hidden; color: var(--ai-text); font-size: 15px; text-overflow: ellipsis; white-space: nowrap; }
.ai-chat-toolbar-actions { display: flex; align-items: center; gap: 8px; }
.ai-chat-mobile-nav-button { display: none; }
.ai-chat-model-popover { position: relative; }
.ai-chat-model-popover > summary { display: inline-flex; align-items: center; min-height: 34px; border: 1px solid var(--ai-border-subtle); border-radius: 8px; padding: 7px 10px; color: var(--ai-text-secondary); background: var(--ai-surface); font-size: 12px; font-weight: 800; cursor: pointer; list-style: none; }
.ai-chat-model-popover > summary::-webkit-details-marker { display: none; }
.ai-chat-model-popover > summary::after { content: "⌄"; margin-left: 8px; color: var(--ai-text-muted); }
.ai-chat-model-popover[open] > summary { border-color: var(--ai-accent-border); background: var(--ai-accent-bg); }
.ai-chat-model-popover-panel { position: absolute; top: calc(100% + 8px); right: 0; z-index: 45; width: min(360px, calc(100vw - 32px)); max-height: min(72vh, 620px); overflow-y: auto; border: 1px solid var(--ai-border); border-radius: 12px; padding: 14px; background: var(--ai-surface); box-shadow: 0 20px 54px var(--ai-shadow-strong); }
.ai-chat-context-settings { display: grid; gap: 12px; }
.ai-chat-context-settings .ai-chat-side-head { padding-bottom: 2px; }
.ai-chat-messages { width: min(900px, 100%); justify-self: center; padding: 28px 0 24px; }
.ai-chat-message { width: min(820px, 100%); gap: 6px; }
.ai-chat-message.user { width: min(720px, calc(100% - 48px)); }
.ai-chat-content { border-color: transparent; border-radius: 12px; padding: 12px 14px; background: transparent; }
.ai-chat-message.user .ai-chat-content { border-color: transparent; background: var(--ai-accent-bg); }
.ai-chat-message:hover .ai-chat-content { border-color: var(--ai-border-subtle); }
.ai-chat-composer-shell { position: sticky; bottom: 0; z-index: 20; width: min(900px, 100%); justify-self: center; padding: 10px 0 18px; background: linear-gradient(180deg, color-mix(in srgb, var(--ai-main) 0%, transparent), var(--ai-main) 20%); }
.ai-chat-composer-status { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 0 6px 7px; color: var(--ai-text-faint); font-size: 10px; }
.ai-chat-composer-model { overflow: hidden; max-width: 50%; color: var(--ai-text-muted); font-weight: 700; text-overflow: ellipsis; white-space: nowrap; }
.ai-chat-input-row { position: relative; display: grid; grid-template-columns: 44px minmax(0, 1fr) 72px; gap: 8px; align-items: end; width: 100%; border: 1px solid var(--ai-border); border-radius: 14px; padding: 8px; background: var(--ai-surface); box-shadow: 0 12px 36px var(--ai-shadow-subtle); }
.ai-chat-input-row:focus-within { border-color: var(--ai-accent-border); box-shadow: 0 0 0 3px var(--ai-accent-bg-soft), 0 12px 36px var(--ai-shadow-subtle); }
.ai-chat-input-row.ai-chat-drop-active::after { inset: 4px; border-radius: 10px; }
.ai-chat-plus-button, .ai-chat-input-row > button[type="submit"] { min-height: 42px; }
.ai-chat-plus-button { width: 42px; border: 1px solid transparent; border-radius: 10px; background: transparent; }
.ai-chat-plus-button:hover { background: var(--ai-surface-hover); }
.ai-chat-input-row textarea { min-height: 42px; max-height: 200px; border: 0; border-radius: 8px; padding: 10px 4px; background: transparent; }
.ai-chat-input-row textarea:focus { outline: 0; }
.ai-chat-input-row > button[type="submit"] { border-radius: 10px; padding: 0 10px; }
.ai-chat-context-meta { width: min(900px, 100%); justify-self: center; padding: 0 6px 4px; font-size: 10px; }
.ai-chat-pending-context, .ai-chat-pending-attachments { width: min(900px, 100%); justify-self: center; }

@media (min-width: 981px) {
  .ai-chat-layout { overflow: hidden; }
  .ai-chat-sidebar { min-height: 0; }
  .ai-chat-messages { overflow-y: auto; overscroll-behavior: contain; scrollbar-gutter: stable; }
  .ai-chat-layout.ai-chat-sidebar-collapsed { grid-template-columns: 0 minmax(0, 1fr); }
  .ai-chat-layout.ai-chat-sidebar-collapsed .ai-chat-sidebar { min-width: 0; overflow: hidden; padding: 0; border-right: 0; opacity: 0; pointer-events: none; visibility: hidden; }
}

@media (max-width: 980px) {
  .ai-chat-layout { grid-template-columns: 1fr; }
  .ai-chat-main { padding: 0 18px; }
  .ai-chat-message.user { width: min(720px, calc(100% - 24px)); }
}

@media (max-width: 720px) {
  .ai-chat-layout { min-height: 0; }
  .ai-chat-sidebar { padding: 14px 12px 12px; }
  .ai-chat-sidebar-footer { margin-top: 12px; }
  .ai-chat-main { min-height: 0; height: 100%; padding: 0 12px; }
  .ai-chat-toolbar { min-height: 52px; }
  .ai-chat-toolbar-title { max-width: 58%; }
  .ai-chat-toolbar-actions { gap: 5px; }
  .ai-chat-mobile-nav-button { display: inline-flex; min-height: 34px; padding: 7px 10px; }
  .ai-chat-model-popover > summary { min-height: 34px; padding: 7px 8px; font-size: 11px; }
  .ai-chat-model-popover-panel { position: fixed; top: auto; right: 10px; bottom: 10px; left: 10px; width: auto; max-height: min(78dvh, 620px); }
  .ai-chat-messages { padding: 18px 0 12px; }
  .ai-chat-message.user { width: 100%; }
  .ai-chat-composer-shell { padding-bottom: calc(8px + env(safe-area-inset-bottom)); }
  .ai-chat-composer-status { padding-inline: 4px; }
  .ai-chat-input-row { grid-template-columns: 42px minmax(0, 1fr) 62px; padding: 7px; }
  .ai-chat-input-row > button[type="submit"] { padding-inline: 6px; }
}

/* Keep long chat surfaces quiet and consistent with the neutral workspace shell. */
.ai-chat-sidebar,
.ai-chat-recent-sessions-list,
.ai-chat-messages,
.account-dropdown,
.ai-chat-compaction-summary,
.ai-chat-model-popover-panel,
.ai-chat-jump-items {
  scrollbar-gutter: stable;
  scrollbar-width: thin;
}

.ai-chat-messages,
.ai-chat-recent-sessions-list {
  overscroll-behavior: contain;
}