/* ── Chat View ─────────────────────────────────────────────────────────────── */

.chat-view {
  display: flex;
  height: 100%;
  overflow: hidden;
}

/* Sidebar */
.chat-sidebar {
  min-width: 0;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
}

.chat-sidebar--hidden {
  display: none;
}

.chat-sidebar-resize-handle {
  position: relative;
  width: var(--space-sm);
  flex-shrink: 0;
  cursor: col-resize;
  background: transparent;
  touch-action: none;
  transition: background var(--transition-fast);
}

.chat-sidebar-resize-handle::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: var(--space-xs);
  transform: translateX(-50%);
}

.chat-sidebar-resize-handle:hover::before,
.chat-sidebar-resize-handle:active::before {
  background: color-mix(in srgb, var(--todo) 30%, transparent);
}

.chat-sidebar-resize-handle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-sidebar-scope-toggle {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border);
}

.chat-sidebar-scope-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-muted);
  font-size: var(--space-md);
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat-sidebar-scope-btn:hover {
  background: var(--card-hover);
  color: var(--text);
}

.chat-sidebar-scope-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-sidebar-scope-btn--active {
  background: var(--card);
  color: var(--text);
  box-shadow: inset 0 calc(var(--btn-border-width) * -2) 0 var(--todo);
}

.chat-sidebar-rooms {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.chat-sidebar-rooms-header {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border);
}

.chat-sidebar-rooms-empty {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-muted);
  padding: var(--space-xl) var(--space-lg);
  font-size: var(--space-md);
}

.chat-room-item {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text);
  padding: var(--space-sm) var(--space-md);
  text-align: left;
}

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

.chat-room-item:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-room-item--active {
  background: color-mix(in srgb, var(--todo) 12%, transparent);
}

.chat-room-item-name {
  font-weight: 500;
}

.chat-room-item-meta {
  color: var(--text-muted);
  font-size: var(--space-sm);
}

.chat-room-thread-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
}

.chat-room-thread-members {
  margin-left: auto;
  display: flex;
  gap: var(--space-xs);
  overflow-x: auto;
}

.chat-room-empty-pane {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  padding: var(--space-2xl);
}

.chat-sidebar-search-container {
  padding: var(--space-sm);
}

.chat-sidebar-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.chat-sidebar-search-icon {
  position: absolute;
  left: var(--space-md);
  color: var(--text-tertiary);
  pointer-events: none;
}

.chat-sidebar-search {
  width: 100%;
  padding: var(--space-sm) var(--space-md) var(--space-sm) calc(var(--space-2xl) + var(--space-xs));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
}

.chat-session-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 4px 8px;
}

.chat-session-item {
  padding: 10px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: background 0.15s;
  position: relative;
}

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

.chat-session-item--active {
  border-left: calc(var(--btn-border-width) * 3) solid var(--todo);
  padding-left: calc(var(--space-md) - (var(--btn-border-width) * 3));
  background: color-mix(in srgb, var(--todo) 12%, transparent);
}

.chat-session-item--active:hover {
  background: color-mix(in srgb, var(--todo) 16%, transparent);
}

.chat-session-title {
  font-weight: 500;
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-session-preview {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-session-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-tertiary);
}

.chat-session-meta-model {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-session-meta-model .provider-icon {
  flex-shrink: 0;
}

/* === Chat Session Delete Button === */
.chat-session-delete-btn {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--space-md) * 2);
  height: calc(var(--space-md) * 2);
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

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

.chat-session-delete-btn:hover {
  color: var(--color-error);
  opacity: 1;
}

.chat-session-delete-btn:focus {
  opacity: 1;
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

/* Context menu for session items */
.chat-session-context-menu {
  position: fixed;
  background: var(--bg-elevated, var(--bg));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs);
  z-index: 100;
}

.chat-session-context-menu button {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: none;
  background: none;
  color: var(--text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  font-size: 13px;
}

.chat-session-context-menu button:hover {
  background: var(--hover);
}

/* Main chat thread */
.chat-thread {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  position: relative;
}

.chat-thread-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.chat-thread-header-identity {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
}

.chat-thread-header-title {
  font-weight: 600;
  font-size: 15px;
  min-width: 0;
}

.chat-thread-header-new-chat {
  flex-shrink: 0;
}

/* Single thread-wide markdown / plain-text toggle, anchored to the right of
 * the header next to "New Chat". Replaces the per-message eye toggle that
 * used to live inside every assistant bubble. */
.chat-thread-header-render-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--space-md) * 3);
  height: calc(var(--space-md) * 3);
  min-width: calc(var(--space-md) * 3);
  min-height: calc(var(--space-md) * 3);
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  background: transparent;
  cursor: pointer;
  outline: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.chat-thread-header-render-toggle:hover {
  background: var(--bg-hover, var(--bg-secondary));
  color: var(--text);
}

.chat-thread-header-render-toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-thread-header-render-toggle--plain {
  color: var(--text);
}

/* Messages */
.chat-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  /* Stop iOS rubber-band scroll from propagating to the parent /
     document when the user swipes on the edge of the messages list
     with the keyboard up. Without this, the bounce escapes the
     scroll container, the page itself shifts, and the chat-thread
     transform momentarily exposes the body background as a gray
     box partially covering the messages. */
  overscroll-behavior: contain;
}

.chat-message {
  max-width: 75%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.5;
  word-break: break-word;
}

.chat-jump-to-latest {
  position: absolute;
  left: 50%;
  bottom: calc(var(--space-xl) * 3);
  transform: translateX(-50%);
  z-index: 2;
}

.chat-message--user {
  align-self: flex-end;
  background: var(--accent);
  color: var(--accent-text);
  border-bottom-right-radius: var(--radius-sm);
}

.chat-message--assistant {
  align-self: flex-start;
  background: var(--bg-elevated, var(--bg-secondary));
  color: var(--text);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-message-avatar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  font-size: 12px;
  color: var(--text-secondary);
}

/* Model-only chats hide the per-message agent identity. The toggle still
 * needs a place to live, so collapse the avatar row to just the toggle on
 * the right edge instead of a full identity strip. */
.chat-message-avatar.chat-message-avatar--toolbar-only {
  margin-bottom: 0;
  min-height: 0;
  justify-content: flex-end;
}

.chat-message-render-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  width: calc(var(--space-md) * 3);
  height: calc(var(--space-md) * 3);
  min-width: calc(var(--space-md) * 3);
  min-height: calc(var(--space-md) * 3);
  padding: 0;
  border: none;
  color: var(--text-muted);
  background: transparent;
  cursor: pointer;
  outline: none;
}

.chat-message--assistant .chat-message-render-toggle {
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.chat-message--assistant:hover .chat-message-render-toggle,
.chat-message-render-toggle:focus-visible,
.chat-message-render-toggle.chat-message-render-toggle--plain {
  opacity: 1;
}

.chat-message-render-toggle:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
}

.chat-message-render-toggle:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-message-render-toggle--plain {
  color: var(--text);
}

.chat-model-tag {
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--surface-bg, color-mix(in srgb, var(--surface) 55%, transparent));
  color: var(--text-secondary);
  margin-left: 6px;
  white-space: nowrap;
  vertical-align: middle;
}

.chat-message-content {
  white-space: pre-wrap;
}

.chat-message-content--plain {
  white-space: pre-wrap;
}

.chat-message-content--markdown {
  white-space: normal;
  overflow-wrap: anywhere;
}

.chat-message-copy-action {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-xs);
  margin-left: auto;
  width: calc(var(--space-lg) * 2);
  height: calc(var(--space-lg) * 2);
  min-width: calc(var(--space-lg) * 2);
  min-height: calc(var(--space-lg) * 2);
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 35%, transparent);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0.85;
  transition: opacity var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.chat-message-copy-action:hover {
  opacity: 1;
  color: var(--text);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
}

.chat-message-copy-action:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
  opacity: 1;
}

.chat-message-copy-action--success {
  color: var(--color-success);
}

.chat-message-copy-action--error {
  color: var(--color-error);
}

.chat-message-content--markdown > :first-child {
  margin-top: 0;
}

.chat-message-content--markdown > :last-child {
  margin-bottom: 0;
}

.chat-message-content--markdown p,
.chat-message-content--markdown ul,
.chat-message-content--markdown ol,
.chat-message-content--markdown blockquote,
.chat-message-content--markdown pre,
.chat-message-content--markdown table {
  margin: 0 0 var(--space-sm);
}

.chat-message-content--markdown ul,
.chat-message-content--markdown ol {
  padding-left: var(--space-lg);
}

.chat-message-content--markdown code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.chat-message-content--markdown :not(pre) > code {
  padding: 0 var(--space-xs);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
}

.chat-markdown-pre {
  margin: 0 0 var(--space-sm);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 65%, transparent);
  overflow-x: auto;
  white-space: pre;
  max-width: 100%;
}

.chat-markdown-table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.chat-markdown-table th,
.chat-markdown-table td {
  border: 1px solid color-mix(in srgb, var(--border) 85%, transparent);
  padding: var(--space-xs) var(--space-sm);
}

.chat-message-time {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.chat-message-thinking {
  margin-top: 6px;
}

.chat-message-thinking summary {
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
}

.chat-message-thinking-content {
  font-size: 13px;
  color: var(--text-secondary);
  padding: 8px;
  background: var(--bg);
  border-radius: 6px;
  margin-top: 4px;
  white-space: pre-wrap;
  font-family: var(--font-mono, monospace);
  overflow-x: auto;
}

/* === Chat Tool Calls === */
.chat-tool-calls {
  margin-top: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.chat-tool-calls-header {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-muted);
  font-size: var(--space-md);
}

.chat-tool-calls-group {
  border: var(--btn-border-width, 1px) solid color-mix(in srgb, var(--border) 85%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 35%, transparent);
}

.chat-tool-calls-group-summary {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-size: var(--space-md);
  min-width: 0;
}

.chat-tool-calls-group-summary::marker {
  content: "";
}

.chat-tool-calls-group-summary::-webkit-details-marker {
  display: none;
}

.chat-tool-calls-group-summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-tool-calls-count {
  white-space: nowrap;
  flex-shrink: 0;
}

.chat-tool-calls-names {
  color: var(--text-dim);
  font-family: var(--font-mono, monospace);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.6875rem;
}

.chat-tool-calls-group-status {
  margin-left: auto;
  font-size: 0.6875rem;
  color: var(--text-dim);
  flex-shrink: 0;
}

.chat-tool-calls-group > .chat-tool-call {
  margin: 0 var(--space-xs) var(--space-xs);
}

.chat-tool-calls-group > .chat-tool-call:last-child {
  margin-bottom: var(--space-xs);
}

.chat-tool-call {
  border: var(--btn-border-width, 1px) solid color-mix(in srgb, var(--border) 85%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 35%, transparent);
}

.chat-tool-call summary {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  font-size: var(--space-md);
  min-width: 0;
}

.chat-tool-call summary::marker {
  content: "";
}

.chat-tool-call summary::-webkit-details-marker {
  display: none;
}

.chat-tool-call summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-tool-call-status-dot {
  width: calc((var(--space-xs) + var(--space-sm)) / 2);
  height: calc((var(--space-xs) + var(--space-sm)) / 2);
  border-radius: 50%;
  background: var(--color-success);
  flex-shrink: 0;
}

.chat-tool-call-name {
  font-family: var(--font-mono, monospace);
  flex: 0 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-tool-call-preview {
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
  font-size: 0.6875rem;
}

.chat-tool-call-status-text {
  margin-left: auto;
  font-size: 0.6875rem;
  text-transform: lowercase;
}

.chat-tool-call-content {
  margin: var(--space-xs);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-family: var(--font-mono, monospace);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.chat-tool-call-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xs);
  align-items: start;
}

.chat-tool-call-label {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.6875rem;
}

.chat-tool-call-value {
  color: var(--text);
  word-break: break-word;
  white-space: pre-wrap;
}

.chat-tool-call--running .chat-tool-call-status-dot {
  background: var(--color-info);
  animation: tool-call-pulse var(--transition-slow) infinite;
}

.chat-tool-call--error summary {
  color: var(--color-error);
}

.chat-tool-call--error .chat-tool-call-status-dot {
  background: var(--color-error);
}

.chat-tool-call-row--error {
  background: color-mix(in srgb, var(--color-error) 10%, transparent);
  border-radius: var(--radius-sm);
  padding: var(--space-xs);
}

.chat-tool-calls--compact .chat-tool-calls-header,
.chat-tool-calls--compact .chat-tool-calls-group-summary,
.chat-tool-calls--compact .chat-tool-calls-names,
.chat-tool-calls--compact .chat-tool-calls-group-status,
.chat-tool-calls--compact .chat-tool-call summary,
.chat-tool-calls--compact .chat-tool-call-content,
.chat-tool-calls--compact .chat-tool-call-preview,
.chat-tool-calls--compact .chat-tool-call-value,
.chat-tool-calls-group--compact .chat-tool-calls-group-summary,
.chat-tool-calls-group--compact .chat-tool-calls-names {
  font-size: 0.6875rem;
}

@keyframes tool-call-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

/* Streaming indicator */
.chat-message--streaming {
  align-self: flex-start;
  background: var(--bg-elevated, var(--bg-secondary));
  color: var(--text);
  border-bottom-left-radius: 4px;
  opacity: 0.9;
}

.chat-typing-indicator {
  display: inline-flex;
  gap: 4px;
  padding: 4px 0;
}

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

.chat-typing-indicator span:nth-child(1) { animation-delay: 0s; }
.chat-typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes chat-typing-bounce {
  0%, 80%, 100% { opacity: 0.3; }
  40% { opacity: 1; }
}

/* Chat waiting state */
.chat-message-content--waiting {
  color: var(--text-muted);
  font-style: italic;
  font-size: 13px;
}

.quick-chat-panel-waiting {
  color: var(--text-muted) !important;
  font-style: italic;
}

/* Input area */
.chat-input-area {
  position: relative;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  /* Stop iOS rubber-band escape when the user swipes on the composer
     edge with the keyboard up. Without it the page momentarily shifts
     and the body background peeks through above the messages. */
  overscroll-behavior: contain;
}

.chat-input-row {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  width: 100%;
}

/* === Chat Skill Menu === */
.chat-skill-menu {
  position: absolute;
  left: var(--space-lg);
  bottom: calc(100% + var(--space-xs));
  min-width: calc((var(--space-xl) * 10) + var(--space-2xl) + (var(--space-xs) * 2));
  max-width: calc(100% - (var(--space-lg) * 2));
  max-height: calc(var(--space-xl) * 10);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 50;
}

.chat-skill-menu-item {
  width: 100%;
  border: none;
  background: transparent;
  color: inherit;
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  transition: background var(--transition-fast);
}

.chat-skill-menu-item:hover,
.chat-skill-menu-item--highlighted {
  background: var(--card-hover);
}

.chat-skill-menu-item:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
  background: var(--card-hover);
}

.chat-skill-menu-item-name {
  font-size: 0.8125rem;
  color: var(--text);
  font-family: var(--font-mono);
}

.chat-skill-menu-item-description {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: calc((var(--space-xl) * 10) + var(--space-lg) + var(--space-xs));
}

.chat-skill-menu-empty {
  padding: var(--space-sm) var(--space-md);
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.chat-input-textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  line-height: 1.4;
  max-height: 120px;
  min-height: 40px;
  /* touch-action: manipulation allows tap-to-focus (so iOS doesn't
     auto-dismiss the keyboard between gesture frames) and blocks
     double-tap zoom + pan/zoom gestures. We previously tried `none`
     to lock the composer against pan, but that broke first-tap
     focus on iOS. */
  touch-action: manipulation;
  overscroll-behavior: contain;
}

.chat-input-textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.chat-input-send {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.chat-input-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.chat-input-stop {
  width: calc(var(--space-xl) * 2);
  height: calc(var(--space-xl) * 2);
  border-radius: var(--radius-md);
  border: none;
  background: color-mix(in srgb, var(--color-error) 15%, transparent);
  color: var(--color-error);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast), transform var(--transition-fast), color var(--transition-fast);
}

.chat-input-stop:hover {
  background: color-mix(in srgb, var(--color-error) 25%, transparent);
}

.chat-input-stop:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-input-stop:active {
  transform: scale(0.97);
}

.chat-attach-btn {
  min-width: calc(var(--space-lg) * 2);
  min-height: calc(var(--space-lg) * 2);
  align-self: flex-end;
}

.chat-input-wrapper {
  flex: 1;
}

.chat-input-wrapper--dragover {
  border: 1px dashed var(--todo);
  border-radius: var(--radius-md);
}

.chat-attachment-previews {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  overflow-x: auto;
  border-top: 1px solid var(--border);
  background: var(--surface);
  width: 100%;
}

.chat-attachment-preview {
  width: calc(var(--space-xl) * 3);
  height: calc(var(--space-xl) * 3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  position: relative;
  flex-shrink: 0;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-attachment-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.chat-attachment-preview-name {
  font-size: 0.625rem;
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-muted);
  padding: var(--space-xs);
}

.chat-attachment-remove {
  position: absolute;
  top: calc(var(--space-xs) * -1);
  right: calc(var(--space-xs) * -1);
  background: color-mix(in srgb, var(--color-error) 80%, transparent);
  color: var(--text);
  border: none;
  border-radius: var(--radius-pill);
  width: calc(var(--space-md) * 2);
  height: calc(var(--space-md) * 2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.chat-attachment-remove:hover {
  background: color-mix(in srgb, var(--color-error) 90%, transparent);
}

.chat-attachment-remove:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

.chat-attachment-remove:active {
  transform: scale(0.97);
}

.chat-message-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
}

.chat-message-attachment-link {
  display: inline-flex;
  border-radius: var(--radius-sm);
}

.chat-message-attachment {
  max-width: calc(var(--space-xl) * 12);
  border-radius: var(--radius-sm);
}

.chat-message-attachment-file {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--surface) 50%, transparent);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
}

.chat-message-attachment-file:hover {
  background: color-mix(in srgb, var(--surface) 70%, transparent);
}

.chat-message-attachment-file:focus-visible,
.chat-message-attachment-link:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring-strong);
}

/* === Chat Pending Message === */
.chat-pending-message {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--todo) 10%, transparent);
  color: var(--text-muted);
  font-size: 12px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.chat-pending-message span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-pending-message-dismiss {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: var(--space-xs);
  line-height: 1;
  flex-shrink: 0;
  font-size: 14px;
}

.chat-pending-message-dismiss:hover {
  color: var(--text-muted);
}

/* Sidebar footer contains the primary New Chat action on desktop and mobile. */
.chat-sidebar-footer {
  display: block;
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
}

.chat-sidebar-footer .chat-sidebar-footer-btn {
  width: 100%;
  justify-content: center;
  min-height: 40px;
}

/* === Mobile: one pane at a time =========================================
   Sidebar (session list) and thread are siblings of .chat-view. On mobile
   we show whichever one is "active" full-width: when the sidebar is
   visible, the thread is hidden; when the sidebar is hidden (a session is
   open), the sidebar is collapsed via .chat-sidebar--hidden and the
   thread takes the full viewport. The thread already renders a back
   button (ChevronLeft) on mobile to flip back to the session list. */
@media (max-width: 768px) {
  .chat-sidebar {
    width: 100%;
    min-width: 0;
    border-right: none;
  }

  /* When the sidebar is shown, the thread is hidden so only the session
     list is visible. When the sidebar is hidden, the thread fills the
     viewport. Adjacent-sibling selector keeps logic in CSS only. */
  .chat-sidebar:not(.chat-sidebar--hidden) + .chat-thread {
    display: none;
  }

  .chat-thread--keyboard-active {
    height: calc(var(--vv-height, calc(100dvh - var(--keyboard-overlap, 0px))) - var(--header-height));
    max-height: calc(var(--vv-height, calc(100dvh - var(--keyboard-overlap, 0px))) - var(--header-height));
    /* Re-anchored: useMobileKeyboard now only updates --vv-offset-top
       on resize/focus transitions (not on every visualViewport scroll
       during a pan), so the transform tracks the keyboard open/close
       without jittering during a swipe. */
    transform: translateY(var(--vv-offset-top, 0px));
    will-change: transform;
  }

  /* On mobile, the "New Chat" affordance uses a full-width pinned footer. */
  .chat-sidebar-footer {
    display: block;
    padding: var(--space-sm) var(--space-md);
    padding-bottom: max(var(--space-sm), env(safe-area-inset-bottom, 0));
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
  }

  .chat-sidebar-footer .chat-sidebar-footer-btn {
    width: 100%;
    justify-content: center;
    min-height: 40px;
  }

  .chat-thread-header {
    flex-wrap: nowrap;
  }

  .chat-thread-header-identity {
    flex: 1 1 auto;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
  }

  .chat-thread-header-identity .chat-thread-header-title,
  .chat-thread-header-identity .chat-model-tag {
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .chat-thread-header-render-toggle {
    flex-shrink: 0;
  }

  .chat-thread-header-new-chat {
    display: none;
  }

  .chat-sidebar-scope-btn {
    min-height: calc(var(--space-lg) * 2.25);
  }

  .chat-session-delete-btn {
    opacity: 1;
    width: calc(var(--space-lg) * 2.25);
    height: calc(var(--space-lg) * 2.25);
    min-width: calc(var(--space-lg) * 2.25);
    min-height: calc(var(--space-lg) * 2.25);
  }

  .chat-message--assistant .chat-message-render-toggle {
    opacity: 1;
  }

  .chat-message-copy-action {
    opacity: 1;
    width: calc(var(--space-lg) * 2.25);
    height: calc(var(--space-lg) * 2.25);
    min-width: calc(var(--space-lg) * 2.25);
    min-height: calc(var(--space-lg) * 2.25);
  }

  .chat-tool-calls-group-summary,
  .chat-tool-call summary {
    flex-wrap: nowrap;
    flex-direction: row;
    align-items: center;
  }

  .chat-tool-calls-names,
  .chat-tool-call-name,
  .chat-tool-call-status-text,
  .chat-tool-calls-group-status,
  .chat-tool-calls-count {
    white-space: nowrap;
  }

  .chat-tool-calls-group-status,
  .chat-tool-call-status-text {
    margin-left: auto;
  }

  .chat-attach-btn,
  .chat-input-send,
  .chat-input-stop {
    min-width: calc(var(--space-lg) * 2.25);
    min-height: calc(var(--space-lg) * 2.25);
  }

  .chat-attachment-preview {
    width: calc(var(--space-xl) * 2.5);
    height: calc(var(--space-xl) * 2.5);
  }

  .chat-attachment-remove {
    width: calc(var(--space-lg) * 2.25);
    height: calc(var(--space-lg) * 2.25);
  }

  .chat-message {
    max-width: 82%;
  }

  .chat-jump-to-latest {
    bottom: calc(var(--space-xl) * 4);
  }

  .chat-sidebar-rooms-header .btn {
    width: 100%;
    justify-content: center;
  }

  .chat-room-thread-header {
    padding: var(--space-sm) var(--space-md);
  }

  .chat-room-thread-header .btn-icon {
    min-height: 36px;
    min-width: 36px;
  }

  .chat-room-thread-members {
    max-width: 50%;
  }
}