.chat-open .message,
.message {
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: 0.45rem;
  width: fit-content;
  max-width: 100%;
  padding: 0;
  background: transparent;
  color: var(--foreground);
  font-size: 1.071rem;
  line-height: 1.75;
}
.message-body {
  min-width: 0;
  max-width: 100%;
}
.follow-up-candidate {
  align-self: flex-start;
  width: min(36rem, 100%);
  margin: 0.15rem 0 1rem;
  padding: 0.85rem 1rem;
  border: 1px dashed var(--border);
  border-radius: 1rem;
  background: var(--surface);
  overflow-wrap: anywhere;
}
.follow-up-candidate p {
  margin: 0;
  white-space: pre-wrap;
}
.follow-up-candidate-label,
.follow-up-candidate-context {
  color: var(--text-secondary);
  font-size: 0.8rem;
  line-height: 1.6;
}
.follow-up-candidate-message {
  padding: 0.45rem 0;
  color: var(--foreground);
  line-height: 1.65;
}
.chat-open .message.user,
.message.user {
  margin-left: auto;
  max-width: 92%;
  padding: 0;
  background: transparent;
  border-radius: 0;
}
.message.user .message-body {
  padding: 0.7rem 1rem;
  background: var(--accent);
  border-radius: 1.3rem 1.3rem 0.4rem 1.3rem;
}
.chat-open .message.assistant,
.message.assistant {
  align-self: flex-start;
  padding: 0.35rem 0;
}
.chat-open .message.assistant .message-content,
.message.assistant .message-content {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--foreground);
  border-radius: 0;
}
.chat-open .message .role,
.message .role {
  display: block;
  margin: 0 0 0.45rem;
  padding: 0;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0;
}
.message-reactions {
  display: flex;
  flex: none;
  align-items: center;
  align-self: flex-end;
  gap: 2px;
  padding-bottom: 2px;
  white-space: normal;
}
.message.user .message-reactions {
  order: -1;
  align-self: center;
}
.message-reaction-chip,
.message-reaction-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  min-width: 32px;
  min-height: 32px;
  padding: 4px 6px;
  border-radius: 999px;
  background: var(--surface);
  color: var(--foreground);
  border: 1px solid var(--border);
  font-size: 17px;
  line-height: 1.2;
}
.message-reaction-chip[data-actors~="user"] {
  background: var(--accent);
  border-color: var(--border-strong);
}
.message-reaction-chip[data-actors="sierra"] {
  box-shadow: 0 1px 4px #00000008;
}
.message-reaction-chip .reaction-count {
  margin: 0 0 0 4px;
  color: var(--text-secondary);
  font: 600 10px/1 var(--font-sans);
}
.message-reaction-trigger {
  width: 32px;
  padding: 4px;
  border-color: transparent;
  color: var(--muted);
  background: transparent;
  opacity: 0;
}
.message:hover .message-reaction-trigger,
.message:focus-within .message-reaction-trigger,
.message-reaction-trigger[aria-expanded="true"] {
  opacity: 1;
}
.message-reaction-trigger:hover {
  color: var(--foreground);
  background: var(--accent);
}
.message-reaction-trigger:active,
.message-reaction-chip:active {
  transform: scale(0.94);
}
.reaction-popover {
  position: fixed;
  inset: auto;
  width: min(328px, calc(100vw - 24px));
  margin: 0;
  padding: 10px;
  border: 1px solid var(--border-strong);
  border-radius: 18px;
  color: var(--foreground);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 8px 36px #0002;
  overflow: hidden;
}
.reaction-options {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0;
  max-height: min(310px, 50dvh);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.reaction-popover:has(.reaction-search:not([hidden])) .reaction-options {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}
.reaction-option,
.reaction-more {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 44px;
  margin: 0;
  padding: 0;
  font-size: 23px;
  line-height: 1;
  background: transparent;
  color: var(--foreground);
  border: 1px solid transparent;
  border-radius: 11px;
}
.reaction-option[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--border-strong);
}
.reaction-popover button:hover:not(:disabled) {
  background: var(--accent);
}
.reaction-option:active {
  transform: scale(0.9);
}
.reaction-more {
  color: var(--muted);
  font-size: 22px;
  font-weight: 400;
}
.reaction-search {
  display: block;
  margin: 0 0 8px;
}
.reaction-search input {
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--subtle);
  font-size: 14px;
}
.reaction-remove {
  width: 100%;
  margin-top: 6px;
  min-height: 38px;
  padding: 8px;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--border);
  border-radius: 0 0 10px 10px;
  color: var(--text-secondary);
  font-size: 12px;
}
.reaction-error,
.reaction-empty {
  grid-column: 1 / -1;
  margin: 8px 4px 2px;
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.5;
}
.reaction-error {
  color: var(--destructive);
}
.reaction-error:empty {
  display: none;
}
.chat-open .tool-activity,
.tool-activity,
.model-reasoning,
.activity-group {
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}
.chat-open .tool-activity > summary,
.tool-activity > summary,
.model-reasoning summary,
.activity-group > summary {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 26px;
  padding: 2px 4px;
  line-height: 22px;
  font-size: 0.8rem;
  cursor: pointer;
  list-style: none;
  border-radius: 10px;
}
.tool-activity > summary::-webkit-details-marker,
.model-reasoning summary::-webkit-details-marker,
.activity-group > summary::-webkit-details-marker {
  display: none;
}
.tool-activity > summary:hover,
.model-reasoning summary:hover,
.activity-group > summary:hover {
  background: var(--subtle);
}
.tool-activity[open],
.chat-open .tool-activity[open] {
  padding: 0 0 0.4rem;
  border: 1px solid var(--border);
  background: var(--subtle);
}
.tool-activity[data-state="running"] {
  border-color: var(--border-strong);
}
.tool-state,
.reasoning-symbol {
  flex: none;
  width: 18px;
  text-align: center;
  color: var(--muted);
}
.tool-activity[data-state="running"] .tool-state,
.model-reasoning[data-state="running"] .reasoning-symbol {
  color: #4785d7;
}
.tool-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.tool-preview {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted);
  font-size: 0.8rem;
}
.tool-status,
.reasoning-duration,
.tool-duration,
.activity-group-duration,
.activity-group-cost {
  flex: none;
  color: var(--muted);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.tool-title-line {
  display: flex;
  align-items: center;
  flex: 1;
  gap: 0.45rem;
  min-width: 0;
}
.tool-title-line > .tool-preview {
  flex: 0 1 auto;
}
.tool-chevron {
  color: var(--muted);
  margin-left: auto;
}
.tool-activity[open] > summary .tool-chevron,
.model-reasoning[open] > summary .tool-chevron,
.activity-group[open] > summary .tool-chevron {
  transform: rotate(90deg);
}
.tool-facts {
  margin: 0.35rem 0.8rem 0.35rem 2.1rem;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.8rem;
  font-size: 0.8rem;
}
.tool-facts dt {
  color: var(--muted);
}
.tool-facts dd {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
}
.model-reasoning-text {
  margin: 0.3rem 0.55rem 0.6rem 1.4rem;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 2px solid var(--border);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-secondary);
}
.reasoning-title {
  color: var(--text-secondary);
  font-weight: 500;
}
.reasoning-note {
  margin: 0.3rem 1rem 0.3rem 2.4rem;
  color: var(--muted);
  font-size: 0.75rem;
}
.activity-group {
  min-width: 0;
}
.activity-group-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.activity-group > summary {
  width: 100%;
  max-width: 100%;
  min-height: 32px;
}
/* Only the active summary text repaints; rows and layout remain stationary. */
@supports (background-clip: text) or (-webkit-background-clip: text) {
  .activity-group[data-state="running"] > summary .activity-group-label {
    background: linear-gradient(
      100deg,
      var(--muted) 35%,
      var(--foreground) 50%,
      var(--muted) 65%
    );
    background-size: 250% 100%;
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    animation: activity-text-shimmer 1.8s linear infinite;
  }
}
@keyframes activity-text-shimmer {
  from {
    background-position: 100% center;
  }
  to {
    background-position: -100% center;
  }
}
@media (prefers-reduced-motion: reduce), (forced-colors: active) {
  .activity-group[data-state="running"] > summary .activity-group-label {
    animation: none;
    background: none;
    color: var(--text-secondary);
  }
}
.activity-group-content {
  display: grid;
  gap: 4px;
  padding-top: 4px;
}
/* Delegated work: a TaskAgent block sits on an indented rail and closes with its report to the CharacterAgent. */
.activity-group:is([data-agent="task"], [data-agent="subagent"]) {
  --agent-tone: var(--agent-task);
  position: relative;
  padding-left: 16px;
}
.activity-group:is([data-agent="task"], [data-agent="subagent"])::before {
  content: "";
  position: absolute;
  top: 3px;
  bottom: 3px;
  left: 6px;
  width: 2px;
  border-radius: 1px;
  background: color-mix(in srgb, var(--agent-tone) 40%, transparent);
}
.activity-group[data-agent] > summary .reasoning-symbol {
  color: var(--agent-tone);
}
.activity-agent {
  flex: none;
  padding: 0 7px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--agent-tone) 12%, transparent);
  color: var(--agent-tone);
  font-size: 0.7rem;
  font-weight: 600;
  line-height: 18px;
  letter-spacing: 0.01em;
}
.task-report {
  border-radius: 10px;
  color: var(--text-secondary);
}
.task-report > summary {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 26px;
  padding: 2px 4px;
  border-radius: 10px;
  font-size: 0.8rem;
  line-height: 22px;
  list-style: none;
  cursor: pointer;
}
.task-report > summary::-webkit-details-marker {
  display: none;
}
.task-report > summary:hover {
  background: var(--subtle);
}
.task-report-icon {
  flex: none;
  width: 16px;
  text-align: center;
  color: var(--agent-tone, var(--muted));
}
.task-report-title {
  flex: 1;
  min-width: 0;
  color: var(--text-secondary);
  font-weight: 500;
}
.task-report[data-state="failed"] .task-report-icon {
  color: var(--destructive);
}
.task-report[open] > summary .tool-chevron {
  transform: rotate(90deg);
}
.task-report-text {
  margin: 0.3rem 0.55rem 0.6rem 1.4rem;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 2px solid var(--border);
  overflow-wrap: anywhere;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
}
.tool-console[data-handoff="true"] > summary .tool-terminal-icon {
  color: var(--agent-tone, var(--muted));
}
@media (forced-colors: active) {
  .activity-agent {
    border: 1px solid CanvasText;
    background: Canvas;
    color: CanvasText;
  }
  .activity-group:is([data-agent="task"], [data-agent="subagent"])::before {
    background: CanvasText;
  }
}
.activity-group > summary:focus-visible {
  outline: 2px solid var(--text-secondary);
  outline-offset: 2px;
}
@media (hover: none), (pointer: coarse) {
  .message-reaction-trigger {
    opacity: 1;
    width: 40px;
    min-height: 40px;
  }
  .message-reaction-chip {
    min-height: 36px;
  }
}
@media (max-width: 520px) {
  .chat-open .message.user,
  .message.user {
    max-width: 96%;
  }
  .tool-activity summary {
    flex-wrap: wrap;
  }
  .tool-status {
    margin-left: auto;
  }
  .tool-preview {
    font-size: 0.75rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  .message-reaction-trigger:active,
  .message-reaction-chip:active,
  .reaction-option:active {
    transform: none;
  }
}
@media (prefers-reduced-transparency: reduce), (prefers-contrast: more) {
  .reaction-popover {
    background: var(--surface);
    backdrop-filter: none;
    border-color: var(--foreground);
  }
}

/* Activity disclosures occupy a single text line until expanded. */
.chat-open .tool-activity > summary,
.model-reasoning summary {
  min-height: 26px;
  padding-block: 2px;
}
.tool-activity .tool-status {
  display: none;
}
@media (pointer: coarse) {
  .chat-open .tool-activity > summary,
  .model-reasoning summary,
  .activity-group > summary {
    min-height: 36px;
  }
}
.chat-open
  #messages
  > :is(.tool-activity, .model-reasoning)
  + :is(.tool-activity, .model-reasoning) {
  margin-top: -16px;
}
@media (max-width: 760px) {
  .chat-open
    #messages
    > :is(.tool-activity, .model-reasoning)
    + :is(.tool-activity, .model-reasoning) {
    margin-top: -14px;
  }
}

.tool-console {
  position: relative;
}
.tool-console > summary .tool-kind {
  display: none;
}
.tool-console > summary .tool-preview {
  color: var(--text-secondary);
  font: 0.84rem/1.6 var(--font-sans, system-ui, sans-serif);
}
.tool-terminal-icon {
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--muted);
  font:
    600 0.8rem/1 ui-monospace,
    monospace;
  letter-spacing: -2px;
}
.tool-console[open],
.chat-open .tool-console[open] {
  padding: 0;
  border-radius: 10px;
  background: var(--surface);
}
.tool-console[open] > summary {
  min-height: 33px;
  padding: 5px 9px;
  border-radius: 9px 9px 0 0;
  border-bottom: 1px solid var(--border);
}
.tool-call-detail {
  min-width: 0;
  margin: 0;
  text-align: left;
}
.tool-detail-action {
  flex: none;
  min-height: 25px;
  padding: 3px 6px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.7rem;
  cursor: pointer;
}
.tool-detail-action:hover {
  background: var(--subtle);
  color: var(--text);
}
.tool-console-copy {
  position: absolute;
  right: 27px;
  top: 4px;
}
.tool-call-detail pre {
  max-height: 320px;
  overflow: auto;
  margin: 0;
  padding: 12px 13px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text-secondary);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 0.77rem/1.65 var(--font-mono, ui-monospace, monospace);
  user-select: text;
  scrollbar-width: thin;
}
.tool-detail-note {
  margin: 4px 12px 8px;
  color: var(--muted);
  font-size: 0.69rem;
  line-height: 1.5;
}
.tool-console-source {
  font: inherit;
  white-space: inherit;
}
.tool-console-error {
  color: var(--destructive);
}
@media (prefers-color-scheme: dark) {
  .tool-console-source :is(.hljs-keyword, .hljs-selector-tag, .hljs-meta) {
    color: #c4b5fd;
  }
  .tool-console-source :is(.hljs-string, .hljs-regexp, .hljs-template-variable) {
    color: #a7f3d0;
  }
  .tool-console-source :is(.hljs-number, .hljs-literal, .hljs-symbol, .hljs-bullet) {
    color: #fcd34d;
  }
  .tool-console-source :is(.hljs-title, .hljs-section, .hljs-function, .hljs-attr) {
    color: #93c5fd;
  }
  .tool-console-source :is(.hljs-type, .hljs-built_in, .hljs-variable) {
    color: #67e8f9;
  }
}
.tool-console-footer {
  font-variant-numeric: tabular-nums;
}
.tool-console-metadata {
  border-top: 1px solid var(--border);
}
.tool-console-metadata > summary {
  padding: 5px 12px;
  color: var(--muted);
  font-size: 0.68rem;
  cursor: pointer;
}
.tool-console-metadata pre {
  max-height: 200px;
  font-size: 0.7rem;
}
@media (pointer: coarse) {
  .tool-console[open] > summary {
    min-height: 40px;
  }
  .tool-console-copy {
    min-height: 36px;
    top: 2px;
    padding-inline: 9px;
  }
}

.tool-console[data-state="failed"] > summary .tool-terminal-icon {
  color: var(--destructive);
}
.tool-console[data-state="interrupted"] > summary .tool-terminal-icon {
  color: #a57a41;
}
.tool-accessible-state {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}