/* --- Left Column: Agent Sidebar --- */
.agent-sidebar {
  width: 260px;
  background: var(--color-white);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.agent-sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--color-border);
}

.agent-sidebar-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.agent-sidebar-search {
  margin-top: 12px;
  position: relative;
}

.agent-sidebar-search input {
  width: 100%;
  padding: 8px 12px 8px 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-gray-50);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.agent-sidebar-search input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgb(14 165 233 / 0.1);
}

.agent-sidebar-search input::placeholder {
  color: var(--color-text-muted);
}

.agent-sidebar-search svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.agent-sidebar-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.08) transparent;
}

.agent-sidebar-list::-webkit-scrollbar { width: 4px; }
.agent-sidebar-list::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.08);
  border-radius: 4px;
}

/* Agent card */
.agent-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 12px;
  min-height: 64px;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  background: transparent;
  text-decoration: none;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  color: var(--color-text-secondary);
  position: relative;
  overflow: hidden;
}

.agent-card:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-200);
  color: var(--color-gray-900);
}

.agent-card.active {
  background: var(--color-primary-50);
  border-color: var(--color-primary-500);
  color: var(--color-primary-900);
}

.agent-card.active .agent-card-name {
  color: var(--color-primary-900);
}

.agent-card.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.agent-card-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 600;
  font-size: var(--text-sm);
  color: #fff;
}

.agent-card-avatar.default-avatar {
  background: var(--color-primary-50);
  color: var(--color-primary-500);
}

.agent-card-avatar.default-avatar svg {
  width: 20px;
  height: 20px;
}

.agent-card-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.agent-card-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-900);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.agent-card-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.agent-card-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 600;
  background: var(--color-primary-50);
  color: var(--color-primary-500);
}

/* Agent sidebar footer */
.agent-sidebar-footer {
  padding: 8px;
  border-top: 1px solid var(--color-border);
}

.agent-sidebar-footer .footer-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.agent-sidebar-footer .footer-link:hover {
  background: var(--color-gray-50);
  color: var(--color-text-secondary);
}

.agent-sidebar-footer .footer-link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* --- Middle Column: History Sidebar --- */
.history-sidebar {
  width: 280px;
  background: var(--color-gray-50);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
}

.history-sidebar-header {
  padding: 20px 16px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.history-sidebar-title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.new-chat-btn {
  background: var(--color-white);
  color: var(--color-text-secondary);
  border: 1px dashed var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.new-chat-btn:hover {
  border-color: var(--color-primary-500);
  color: var(--color-primary-600);
  background: var(--color-primary-50);
}

.new-chat-btn:active {
  transform: scale(0.98);
}

/* Time group labels */
.history-group-label {
  padding: 16px 16px 8px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Conversation list */
.conversation-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  flex: 1;
  padding: 0 8px 8px;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.06) transparent;
}

.conversation-list::-webkit-scrollbar { width: 4px; }
.conversation-list::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.08);
  border-radius: 4px;
}

.conversation-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all var(--transition-fast);
  display: block;
  position: relative;
}

.conversation-link:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.conversation-link.active {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
  font-weight: 500;
}

.conversation-link.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--color-primary-500);
  border-radius: 1px;
}

/* History sidebar footer */
.history-sidebar-footer {
  padding: 8px;
  border-top: 1px solid var(--color-border);
}

/* ============================================
   4. CHAT MAIN AREA
   ============================================ */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  min-width: 0;
  position: relative;
}

/* Agent bar (top of chat area) */
.chat-agent-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.agent-bar-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.agent-bar-name {
  font-weight: 600;
  color: var(--color-text);
}

.agent-bar-meta {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

/* KB bar */
.chat-kb-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(139, 92, 246, 0.08);
  border-bottom: 1px solid rgba(139, 92, 246, 0.15);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.kb-bar-name {
  font-weight: 500;
}

.kb-bar-meta {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

/* ============================================
   5. WELCOME PAGE
   ============================================ */
.chat-welcome {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
}

.chat-welcome-logo {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary-500), #8b5cf6);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.chat-welcome-logo svg {
  width: 24px;
  height: 24px;
  color: #fff;
}

.chat-welcome h2 {
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-gray-900);
  margin: 0 0 24px;
}

/* Router Agent Entry */
.router-entry {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: linear-gradient(135deg, #7c3aed, #8b5cf6, #6366f1);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: left;
  color: #fff;
  margin-bottom: 16px;
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.25);
}

.router-entry:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.35);
}

.router-entry:active {
  transform: translateY(0);
}

.router-entry-icon {
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.router-entry-icon svg {
  width: 22px;
  height: 22px;
}

.router-entry-info {
  flex: 1;
  min-width: 0;
}

.router-entry-title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: 2px;
}

.router-entry-desc {
  font-size: var(--text-xs);
  opacity: 0.85;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.router-entry-arrow {
  width: 28px;
  height: 28px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.router-entry:hover .router-entry-arrow {
  background: rgba(255, 255, 255, 0.35);
}

/* Router Mode Buttons */
.router-modes {
  display: flex;
  gap: 8px;
  width: 100%;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.router-mode-btn {
  flex: 1;
  min-width: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 10px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: center;
  font-family: var(--font-sans);
}

.router-mode-btn.active {
  border-color: var(--color-primary-500);
  background: var(--color-primary-50);
  box-shadow: var(--shadow-sm);
}

.router-mode-btn:hover {
  border-color: var(--color-primary-500);
  background: var(--color-primary-50);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.router-mode-btn:active {
  transform: translateY(0);
}

.router-mode-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eff6ff;
  color: #3b82f6;
  flex-shrink: 0;
}

.router-mode-icon.research {
  background: #f5f3ff;
  color: #8b5cf6;
}

.router-mode-icon.orchestrate {
  background: #f0fdf4;
  color: #10b981;
}

.router-mode-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.router-mode-text strong {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gray-900);
}

.router-mode-text span {
  font-size: 11px;
  color: var(--color-text-muted);
  line-height: 1.3;
}

.chat-welcome-prompts {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.welcome-prompt-card {
  width: 100%;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 16px;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-align: left;
  font-family: var(--font-sans);
}

.welcome-prompt-card:hover {
  border-color: var(--color-primary-500);
  background: var(--color-primary-50);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.welcome-prompt-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-900);
  margin-bottom: 4px;
}

.welcome-prompt-title span.prompt-icon {
  font-size: var(--text-lg);
  line-height: 1;
}

.welcome-prompt-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.4;
}

.chat-welcome-hint {
  margin-top: 24px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Legacy empty state (kept for compatibility) */
.chat-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  color: var(--color-text-muted);
  padding: 40px 20px;
}

.chat-empty-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary-500), #8b5cf6);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-empty-icon svg {
  width: 28px;
  height: 28px;
  color: #fff;
}

.chat-empty p {
  font-size: var(--text-base);
  margin: 0;
}

.chat-empty-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================
   6. MESSAGES
   ============================================ */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: rgba(0, 0, 0, 0.06) transparent;
}

.messages::-webkit-scrollbar { width: 6px; }
.messages::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: 3px;
}

/* Message row */
.message {
  display: flex;
  gap: 12px;
  animation: messageIn 0.3s ease-out;
  max-width: 768px;
  margin: 0 auto;
  width: 100%;
  position: relative;
}

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

.message.user {
  justify-content: flex-end;
}

.message.assistant {
  justify-content: flex-start;
}

/* Avatar */
.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-top: 2px;
}

.message.assistant .message-avatar {
  background: linear-gradient(135deg, var(--color-primary-500), #8b5cf6);
  color: #fff;
}

.message.user .message-avatar {
  background: var(--color-gray-200);
  color: var(--color-text-secondary);
  order: 1;
}

/* ============================================
   7. MESSAGE BUBBLES
   ============================================ */
.bubble {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: var(--radius-xl);
  line-height: 1.6;
  word-wrap: break-word;
  position: relative;
}

/* User bubble */
.message.user .bubble {
  background: var(--color-primary-500);
  color: #fff;
  padding: 8px 12px;
  border-radius: 16px 16px 4px 16px;
  line-height: 1.45;
  white-space: pre-wrap;
  box-shadow: var(--shadow-sm);
}

.message.user .bubble.has-attachments {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  background: transparent;
  padding: 0;
  box-shadow: none;
}

.message.user .bubble.has-attachments .bubble-text {
  max-width: 100%;
  padding: 8px 12px;
  background: var(--color-primary-500);
  border-radius: 16px 16px 4px 16px;
  box-shadow: var(--shadow-sm);
}

/* Assistant bubble */
.message.assistant .bubble {
  background: var(--color-white);
  color: var(--color-gray-900);
  border-radius: 16px 16px 16px 4px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-gray-100);
  white-space: normal;
  max-width: 85%;
}

.bubble.error {
  background: var(--color-error-bg) !important;
  color: var(--color-error) !important;
  border-color: #fecaca !important;
}

/* Message actions bar */
.message-actions {
  display: flex;
  gap: 4px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.message:hover .message-actions {
  opacity: 1;
}

.message-action-btn {
  background: none;
  border: none;
  padding: 4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.message-action-btn:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-600);
}

.message-action-btn svg {
  width: 16px;
  height: 16px;
}

.message-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--color-gray-100);
}

.message-usage {
  display: inline-flex;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: 1;
}

.message-copy-btn {
  width: 26px;
  height: 26px;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  background: var(--color-white);
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.message-copy-btn:hover,
.message-copy-btn.copied {
  color: var(--color-primary-600);
  border-color: var(--color-primary-200);
  background: var(--color-primary-50);
}

.message-copy-btn svg {
  width: 14px;
  height: 14px;
}

.message.user .message-share-actions {
  align-self: flex-end;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.message.user:hover .message-share-actions,
.message.user:focus-within .message-share-actions {
  opacity: 1;
}

.message-share-btn {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 5px 8px;
  transition: all var(--transition-fast);
}

.message-share-btn:hover {
  border-color: var(--color-primary-500);
  color: var(--color-primary-600);
}

.message-footer .button_to {
  display: inline-flex;
}

.message-footer .message-share-btn {
  height: 26px;
  padding: 0 9px;
}

.share-inline-btn {
  border: 0;
  cursor: pointer;
}

/* ============================================
   8. CODE BLOCKS
   ============================================ */
.message.assistant .bubble code {
  background: var(--color-gray-100);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: var(--font-mono);
  color: #e11d48;
}

.message.assistant .bubble pre {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  margin: 10px 0;
  font-size: 13px;
  line-height: 1.6;
  border: 1px solid #334155;
}

.message.assistant .bubble pre.mermaid {
  background: #fff;
  border: 1px solid #e2e8f0;
  max-height: none;
  text-align: center;
  padding: 16px;
  overflow-x: auto;
}

.message.assistant .bubble pre.mermaid svg {
  max-width: 100%;
  height: auto;
}

.message.assistant .bubble pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  border-radius: 0;
  display: block;
  overflow-x: auto;
  padding: 16px;
}

/* Code block header */
.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: #0f172a;
  font-size: var(--text-xs);
  color: #94a3b8;
  font-family: var(--font-sans);
}

.code-block-lang {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.code-copy-btn {
  background: none;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  padding: 2px;
  display: flex;
  align-items: center;
  font-size: var(--text-xs);
  font-family: var(--font-sans);
  gap: 4px;
  transition: color var(--transition-fast);
}

.code-copy-btn:hover {
  color: #e2e8f0;
}

.code-copy-btn svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   9. TYPING & SEARCHING INDICATORS
   ============================================ */
.typing-indicator {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  padding: 4px 0;
}

.typing-indicator span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-text-muted);
  animation: typingDot 1.4s ease-in-out infinite;
}

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

@keyframes typingDot {
  0%, 60%, 100% { opacity: 0.3; transform: scale(0.85); }
  30% { opacity: 1; transform: scale(1); }
}

.bubble.searching {
  background: var(--color-tool-bg) !important;
  color: var(--color-tool) !important;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--text-sm);
  padding: 10px 16px;
  border-color: #bfdbfe !important;
}

.search-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid #bfdbfe;
  border-top-color: var(--color-tool);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

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

/* ============================================
   10. CHAT INPUT
   ============================================ */
.chat-input-form {
  padding: 16px 24px 24px;
  background: var(--color-bg);
  flex-shrink: 0;
}

.input-wrapper {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 8px 8px 8px 16px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
  border-color: var(--color-primary-500);
  box-shadow: var(--shadow-md), 0 0 0 3px rgb(14 165 233 / 0.1);
}

.chat-input {
  flex: 1;
  border: none;
  padding: 6px 0;
  font-size: var(--text-base);
  font-family: var(--font-sans);
  resize: none;
  outline: none;
  line-height: 1.5;
  max-height: 200px;
  background: transparent;
  color: var(--color-gray-900);
}

.chat-input::placeholder {
  color: var(--color-text-muted);
}

.chat-input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Upload button */
.upload-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.upload-btn:hover {
  color: var(--color-primary-500);
  background: var(--color-primary-50);
}

/* Send button */
.send-btn {
  background: var(--color-primary-500);
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  padding: 0;
  opacity: 0.4;
}

.send-btn:not(:disabled) {
  opacity: 1;
}

.send-btn svg {
  width: 16px;
  height: 16px;
}

.send-btn:hover:not(:disabled) {
  background: var(--color-primary-600);
}

.send-btn:active:not(:disabled) {
  transform: scale(0.92);
}

.send-btn:disabled {
  cursor: not-allowed;
}

.stop-btn {
  background: var(--color-error, #ef4444);
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition-fast);
  padding: 0;
}

.stop-btn svg {
  width: 14px;
  height: 14px;
}

.stop-btn:hover:not(:disabled) {
  filter: brightness(1.1);
}

.stop-btn:active:not(:disabled) {
  transform: scale(0.92);
}

.stop-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================
   11. THINKING & TOOL USE
   ============================================ */
.thinking-block {
  margin-bottom: 10px;
  border-left: 3px solid var(--color-thinking);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--color-thinking-bg);
}

.thinking-block summary {
  padding: 8px 12px;
  font-size: var(--text-xs);
  color: var(--color-thinking);
  cursor: pointer;
  user-select: none;
  font-weight: 500;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.thinking-block summary::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid var(--color-thinking);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform var(--transition-fast);
}

.thinking-block[open] summary::before {
  transform: rotate(90deg);
}

.thinking-block summary::-webkit-details-marker {
  display: none;
}

.thinking-content {
  padding: 4px 12px 10px;
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.55;
}

.sub-agent-block {
  margin-bottom: 10px;
  border: 1px solid var(--color-primary-100);
  border-left: 3px solid var(--color-primary-500);
  border-radius: var(--radius-md);
  background: var(--color-primary-50);
  overflow: hidden;
}

.sub-agent-block summary {
  padding: 8px 12px;
  font-size: var(--text-xs);
  color: var(--color-primary-900);
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 7px;
}

.sub-agent-block summary::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 5px solid var(--color-primary-500);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform var(--transition-fast);
}

.sub-agent-block[open] summary::before {
  transform: rotate(90deg);
}

.sub-agent-block summary::-webkit-details-marker {
  display: none;
}

.sub-agent-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.sub-agent-thinking,
.sub-agent-output {
  margin: 0 12px 10px;
  padding-top: 8px;
  border-top: 1px solid rgba(14, 165, 233, 0.18);
}

.sub-agent-section-label {
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.sub-agent-thinking-content {
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.55;
}

.sub-agent-output {
  color: var(--color-gray-900);
}

.tool-use-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 4px 0;
  padding: 5px 12px;
  font-size: var(--text-xs);
  color: var(--color-tool);
  background: var(--color-tool-bg);
  border-radius: var(--radius-full);
  border: 1px solid #bfdbfe;
  font-weight: 500;
}

.tool-use-tag svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.kb-tool-use-tag {
  background: rgba(139, 92, 246, 0.08);
  border-color: rgba(139, 92, 246, 0.3);
  color: #8b5cf6;
}

.export-tool-use-tag {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.3);
  color: #10b981;
}

.ask-user-question-form {
  display: grid;
  gap: 12px;
  margin: 12px 0 4px;
  padding: 14px;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.ask-user-question-title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-gray-900);
  line-height: 1.45;
}

.ask-user-question-field {
  display: grid;
  gap: 7px;
}

.ask-user-question-label {
  font-size: var(--text-xs);
  font-weight: 650;
  color: var(--color-text-secondary);
}

.ask-user-question-input {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--color-gray-900);
  font-size: var(--text-sm);
}

.ask-user-question-input:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.14);
}

.ask-user-question-options {
  display: grid;
  gap: 6px;
}

.ask-user-question-option {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
  padding: 7px 9px;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  background: #f8fafc;
  color: var(--color-gray-900);
  font-size: var(--text-sm);
  cursor: pointer;
}

.ask-user-question-option input {
  flex: 0 0 auto;
}

.ask-user-question-option:has(input:checked) {
  border-color: var(--color-primary-500);
  background: #eff6ff;
}

.ask-user-question-field.invalid .ask-user-question-input,
.ask-user-question-field.invalid .ask-user-question-option {
  border-color: var(--color-error);
}

.ask-user-question-error {
  font-size: var(--text-xs);
  color: var(--color-error);
}

.ask-user-question-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ask-user-question-submit,
.ask-user-question-decline {
  min-height: 34px;
  padding: 7px 12px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 650;
  cursor: pointer;
}

.ask-user-question-submit {
  border: 1px solid var(--color-primary-600);
  background: var(--color-primary-600);
  color: #fff;
}

.ask-user-question-decline {
  border: 1px solid var(--color-gray-300);
  background: #fff;
  color: var(--color-text-secondary);
}

.ask-user-question-summary {
  display: grid;
  gap: 8px;
  margin: 12px 0 4px;
  padding: 12px 14px;
  border: 1px solid rgba(16, 185, 129, 0.24);
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.07);
  color: var(--color-gray-900);
}

.ask-user-question-summary.declined {
  border-color: var(--color-gray-200);
  background: #f8fafc;
}

.ask-user-question-summary-status {
  font-size: var(--text-sm);
  font-weight: 650;
  color: #047857;
}

.ask-user-question-summary.declined .ask-user-question-summary-status {
  color: var(--color-text-secondary);
}

.ask-user-question-summary-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 5px 10px;
  margin: 0;
  font-size: var(--text-xs);
}

.ask-user-question-summary-list dt {
  color: var(--color-text-muted);
}

.ask-user-question-summary-list dd {
  margin: 0;
  color: var(--color-gray-900);
}

/* ============================================
   12. FILE UPLOAD & PREVIEW
   ============================================ */
.file-preview-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 24px 8px;
}

.file-preview-list:empty {
  display: none;
}

.file-preview-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-gray-900);
}

.file-preview-icon {
  color: var(--color-primary-500);
  display: flex;
  align-items: center;
}

.file-preview-name {
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-preview-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  line-height: 1;
  padding: 0 2px;
  margin-left: 2px;
  transition: color var(--transition-fast);
}

.file-preview-remove:hover {
  color: var(--color-error);
}

.image-preview-thumb {
  width: 32px;
  height: 32px;
  object-fit: cover;
  border-radius: 4px;
}

/* User bubble: images and files */
.bubble-images {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
  margin-top: 0;
}

.bubble-images a {
  display: block;
  line-height: 0;
  text-decoration: none;
  border: 0;
}

.bubble-image {
  max-width: 300px;
  max-height: 200px;
  border-radius: var(--radius-md);
  object-fit: cover;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.bubble-image:hover {
  opacity: 0.9;
}

.bubble-files {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
  margin-top: 0;
}

.bubble-file-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: #fff;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.bubble-file-link:hover {
  background: rgba(255, 255, 255, 0.3);
  text-decoration: none;
  color: #fff;
}

.message.user .bubble.has-attachments .bubble-file-link {
  background: rgba(14, 165, 233, 0.12);
  color: var(--color-primary-600);
}

.message.user .bubble.has-attachments .bubble-file-link:hover {
  background: rgba(14, 165, 233, 0.18);
  color: var(--color-primary-600);
}

.bubble-file-link svg {
  flex-shrink: 0;
}

/* File download link */
.file-download-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 8px 0 4px;
  padding: 6px 12px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  color: var(--color-primary-600);
  text-decoration: none;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.file-download-tag:hover {
  background: #dbeafe;
  text-decoration: none;
}

.file-download-tag svg {
  width: 14px;
  height: 14px;
}

/* ============================================
   13. MARKDOWN CONTENT
   ============================================ */
.message.assistant .bubble p { margin: 0 0 10px; }
.message.assistant .bubble p:last-child { margin-bottom: 0; }

.message.assistant .bubble ul,
.message.assistant .bubble ol {
  margin: 6px 0 10px;
  padding-left: 22px;
}

.message.assistant .bubble li { margin-bottom: 4px; }
.message.assistant .bubble li > p { margin-bottom: 4px; }

.message.assistant .bubble blockquote {
  border-left: 3px solid var(--color-primary-500);
  margin: 10px 0;
  padding: 8px 16px;
  color: var(--color-text-secondary);
  background: var(--color-primary-50);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.message.assistant .bubble table {
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 0.9em;
  width: auto;
}

.message.assistant .bubble th,
.message.assistant .bubble td {
  border: 1px solid var(--color-border);
  padding: 8px 12px;
  text-align: left;
}

.message.assistant .bubble th {
  background: var(--color-gray-50);
  font-weight: 600;
  color: var(--color-gray-900);
}

.message.assistant .bubble h1,
.message.assistant .bubble h2,
.message.assistant .bubble h3,
.message.assistant .bubble h4 {
  margin: 16px 0 8px;
  line-height: 1.3;
  color: var(--color-gray-900);
}

.message.assistant .bubble h1 { font-size: 1.3em; }
.message.assistant .bubble h2 { font-size: 1.15em; }
.message.assistant .bubble h3 { font-size: 1.05em; }

.message.assistant .bubble hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 12px 0;
}

.message.assistant .bubble a {
  color: var(--color-primary-500);
  text-decoration: none;
  font-weight: 500;
}

.message.assistant .bubble a:hover {
  text-decoration: underline;
}

.message.assistant .bubble strong {
  font-weight: 600;
  color: var(--color-gray-900);
}

.message.assistant .bubble img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 8px 0;
}

/* ============================================
   14. AGENT SELECTION PANEL (legacy overlay)
   ============================================ */
.agent-panel {
  display: none;
  position: fixed;
  top: 0;
  left: 260px;
  width: 360px;
  height: 100%;
  background: var(--color-white);
  border-right: 1px solid var(--color-border);
  z-index: 100;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.agent-panel.open {
  display: flex;
}

.agent-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}

.agent-panel-header h3 {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-gray-900);
}

.agent-panel-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0 4px;
}

.agent-panel-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.agent-pick-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
  border: 1px solid transparent;
  background: transparent;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  color: var(--color-text-secondary);
}

.agent-pick-card:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-200);
  color: var(--color-gray-900);
}

.agent-pick-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.agent-pick-icon.default {
  background: var(--color-primary-50);
  color: var(--color-primary-500);
}

.agent-pick-icon svg {
  width: 20px;
  height: 20px;
}

.agent-pick-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.agent-pick-info strong {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-900);
}

.agent-pick-info span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ============================================
   15. AGENT COLOR VARIANTS
   ============================================ */
:root {
  --agent-blue: #3b82f6;
  --agent-purple: #8b5cf6;
  --agent-green: #10b981;
  --agent-red: #ef4444;
  --agent-orange: #f97316;
  --agent-violet: #7c3aed;
  --agent-yellow: #eab308;
  --agent-teal: #14b8a6;
  --agent-pink: #ec4899;
}

/* ============================================
   16. RESPONSIVE
   ============================================ */
/* Mobile: < 768px — Single column */
@media (max-width: 767px) {
  .agent-sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    height: 100dvh;
    z-index: 40;
    transition: left var(--transition-slow);
    box-shadow: var(--shadow-xl);
  }

  .agent-sidebar.open {
    left: 0;
  }

  .history-sidebar {
    position: fixed;
    left: -280px;
    top: 0;
    height: 100dvh;
    z-index: 40;
    transition: left var(--transition-slow);
    box-shadow: var(--shadow-xl);
  }

  .history-sidebar.open {
    left: 0;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 35;
  }

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

  .messages {
    padding: 16px;
    gap: 16px;
  }

  .bubble {
    max-width: 88%;
  }

  .chat-input-form {
    padding: 12px 16px 16px;
  }

  .message-avatar {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }

  .message {
    gap: 8px;
  }

  /* Mobile header with toggle buttons */
  .chat-mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
  }

  .chat-mobile-header .mobile-toggle-btn {
    background: none;
    border: none;
    padding: 6px;
    cursor: pointer;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
  }

  .chat-mobile-header .mobile-toggle-btn:hover {
    background: var(--color-gray-100);
  }

  .chat-mobile-header .mobile-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-gray-900);
  }
}

/* Tablet: 768px - 1023px — Two columns (hide agent sidebar) */
@media (min-width: 768px) and (max-width: 1023px) {
  .agent-sidebar {
    position: fixed;
    left: -260px;
    top: 0;
    height: 100dvh;
    z-index: 40;
    transition: left var(--transition-slow);
    box-shadow: var(--shadow-xl);
  }

  .agent-sidebar.open {
    left: 0;
  }

  .chat-mobile-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
  }

  .chat-mobile-header .mobile-toggle-btn {
    background: none;
    border: none;
    padding: 6px;
    cursor: pointer;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
  }

  .chat-mobile-header .mobile-toggle-btn:hover {
    background: var(--color-gray-100);
  }

  .chat-mobile-header .mobile-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-gray-900);
  }

  .history-sidebar {
    width: 240px;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 35;
  }

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

/* Desktop: 1024px+ — Three columns */
@media (min-width: 1024px) {
  .chat-mobile-header {
    display: none;
  }

  .sidebar-overlay {
    display: none !important;
  }
}

/* Large: 1440px+ */
@media (min-width: 1440px) {
  .message {
    max-width: 960px;
  }
}

/* ============================================
   Open Design conversation detail
   ============================================ */
.conversation-workspace {
  --bg: #0b1020;
  --surface: #131b2f;
  --surface-warm: #182343;
  --fg: #f8fafc;
  --fg-2: #cbd5e1;
  --muted: #8ea0b8;
  --meta: #60a5fa;
  --border: #293653;
  --accent: #60a5fa;
  --accent-on: #06111f;
  --accent-2: #ff5701;
  --accent-2-on: #120600;
  --success: #22c55e;
  --warn: #fbbf24;
  --danger: #fb7185;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 15px;
  --text-xl: 22px;
  --leading-body: 1.55;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  --motion-base: 220ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  display: grid;
  grid-template-columns: 84px 320px minmax(0, 1fr);
  min-height: 100vh;
  height: 100vh;
  overflow: hidden;
  background:
    radial-gradient(circle at 78% 4%, color-mix(in oklab, var(--accent) 15%, transparent), transparent 30vw),
    var(--bg);
  color: var(--fg);
  font-size: var(--text-base);
}

.conversation-workspace h1,
.conversation-workspace h2,
.conversation-workspace p {
  margin: 0;
}

.conversation-workspace svg {
  width: 18px;
  height: 18px;
}

.conversation-workspace .workspace-nav {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  height: 100vh;
  padding: var(--space-4) var(--space-2);
  border-right: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 86%, var(--surface));
}

.conversation-workspace .brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: var(--space-2);
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-on);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 760;
  text-decoration: none;
}

.conversation-workspace .rail-link {
  display: grid;
  place-items: center;
  width: 54px;
  min-height: 48px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--muted);
  font-size: 11px;
  font-weight: 680;
  line-height: 1.1;
  text-align: center;
  text-decoration: none;
}

.conversation-workspace .rail-link:hover,
.conversation-workspace .rail-link.active {
  border-color: color-mix(in oklab, var(--accent) 34%, var(--border));
  background: color-mix(in oklab, var(--accent) 10%, var(--surface));
  color: var(--fg);
}

.conversation-workspace .rail-link-static {
  cursor: default;
}

.conversation-workspace .rail-user {
  display: grid;
  gap: var(--space-1);
  justify-items: center;
  margin-top: auto;
  color: var(--muted);
  font-size: 11px;
  text-decoration: none;
}

.conversation-workspace .avatar {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid color-mix(in oklab, white 16%, transparent);
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--fg);
  font-size: 12px;
  font-weight: 760;
  overflow: hidden;
}

.conversation-workspace img.avatar {
  object-fit: cover;
}

.conversation-workspace .context-column {
  display: grid;
  grid-template-rows: minmax(0, 1fr) minmax(220px, .82fr);
  height: 100vh;
  border-right: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 88%, var(--bg));
  min-width: 0;
}

.conversation-workspace .context-panel {
  min-height: 0;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border);
  overflow: auto;
}

.conversation-workspace .context-panel:last-child {
  border-bottom: 0;
}

.conversation-workspace .section-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.conversation-workspace .section-title-row h2 {
  color: var(--fg);
  font-size: var(--text-sm);
  letter-spacing: 0;
}

.conversation-workspace .agent-option,
.conversation-workspace .conversation-row {
  display: grid;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--surface) 86%, var(--bg));
  color: inherit;
  text-align: left;
  text-decoration: none;
}

.conversation-workspace .agent-option + .agent-option,
.conversation-workspace .conversation-row + .conversation-row {
  margin-top: var(--space-2);
}

.conversation-workspace .agent-option.active,
.conversation-workspace .conversation-row.active {
  border-color: color-mix(in oklab, var(--accent) 52%, var(--border));
  background: color-mix(in oklab, var(--accent) 10%, var(--surface));
}

.conversation-workspace .agent-title,
.conversation-workspace .conversation-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-width: 0;
}

.conversation-workspace .agent-profile {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.conversation-workspace .agent-copy,
.conversation-workspace .conversation-copy {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.conversation-workspace .agent-copy strong,
.conversation-workspace .conversation-copy strong {
  overflow: hidden;
  color: var(--fg);
  font-size: var(--text-sm);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-workspace .agent-copy span,
.conversation-workspace .conversation-copy span,
.conversation-workspace .agent-option p,
.conversation-workspace .conversation-row p,
.conversation-workspace .mode-card span {
  color: var(--muted);
  font-size: var(--text-xs);
  line-height: 1.45;
}

.conversation-workspace .workspace-main {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-width: 0;
  height: 100vh;
}

.conversation-workspace .workspace-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 72px;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--surface) 72%, transparent);
  backdrop-filter: blur(16px);
}

.conversation-workspace .workspace-mobile-actions {
  display: none;
  gap: var(--space-2);
}

.conversation-workspace .agent-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.conversation-workspace .agent-bar-copy {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.conversation-workspace .agent-bar h1 {
  overflow: hidden;
  color: var(--fg);
  font-size: var(--text-xl);
  line-height: 1.12;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conversation-workspace .agent-bar-title {
  display: none;
}

.conversation-workspace .eyebrow {
  color: var(--meta);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 680;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.conversation-workspace .chips,
.conversation-workspace .top-actions,
.conversation-workspace .actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.conversation-workspace .btn,
.conversation-workspace button.btn,
.conversation-workspace input.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 34px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--fg);
  cursor: pointer;
  font-size: var(--text-sm);
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--motion-base) var(--ease-standard), border-color var(--motion-base) var(--ease-standard), transform var(--motion-base) var(--ease-standard), box-shadow var(--motion-base) var(--ease-standard);
}

.conversation-workspace .btn:hover {
  border-color: color-mix(in oklab, var(--accent) 55%, var(--border));
  box-shadow: 0 0 0 1px var(--border);
  transform: translateY(-1px);
}

.conversation-workspace .btn.primary {
  border-color: var(--accent-2);
  background: var(--accent-2);
  color: var(--accent-2-on);
  box-shadow: 0 14px 34px color-mix(in oklab, var(--accent-2) 18%, transparent);
}

.conversation-workspace .btn.ghost {
  background: transparent;
  color: var(--fg);
}

.conversation-workspace .btn.danger {
  border-color: color-mix(in oklab, var(--danger) 48%, var(--border));
  background: color-mix(in oklab, var(--danger) 9%, var(--surface));
  color: var(--danger);
}

.conversation-workspace .btn.icon {
  width: 34px;
  padding: 0;
}

.conversation-workspace .button_to {
  display: inline-flex;
  margin: 0;
}

.conversation-workspace .badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 24px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-warm);
  color: var(--muted);
  font-size: var(--text-xs);
  font-weight: 650;
  line-height: 1;
  white-space: nowrap;
}

.conversation-workspace .badge.info {
  border-color: color-mix(in oklab, var(--accent) 44%, var(--border));
  background: color-mix(in oklab, var(--accent) 12%, var(--surface));
  color: color-mix(in oklab, var(--accent) 86%, white);
}

.conversation-workspace .badge.success {
  border-color: color-mix(in oklab, var(--success) 45%, var(--border));
  background: color-mix(in oklab, var(--success) 14%, var(--surface));
  color: color-mix(in oklab, var(--success) 84%, white);
}

.conversation-workspace .workspace-content {
  min-height: 0;
  overflow: auto;
  padding: var(--space-6);
}

.conversation-workspace .kb-context-bar,
.conversation-workspace .run-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  max-width: 980px;
  margin: 0 auto var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--surface) 90%, var(--bg));
}

.conversation-workspace .run-status-bar {
  justify-content: flex-start;
  background: color-mix(in oklab, var(--surface-warm) 62%, var(--surface));
  color: var(--muted);
  font-size: var(--text-xs);
}

.conversation-workspace .run-step,
.conversation-workspace .stream-state {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 24px;
}

.conversation-workspace .run-step.active {
  color: var(--fg);
  font-weight: 700;
}

.conversation-workspace .run-step.quiet {
  margin-left: auto;
}

.conversation-workspace .stream-dot,
.conversation-workspace .mini-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px color-mix(in oklab, var(--accent) 16%, transparent);
}

.conversation-workspace .mini-dot {
  width: 7px;
  height: 7px;
  box-shadow: none;
}

.conversation-workspace .mini-dot.warn {
  background: var(--warn);
}

.conversation-workspace .chat-stream {
  display: grid;
  gap: var(--space-5);
  max-width: 980px;
  margin: 0 auto;
  padding-bottom: var(--space-6);
  overflow: visible;
}

.conversation-workspace .message {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: var(--space-3);
  width: 100%;
  max-width: none;
}

.conversation-workspace .message.user {
  grid-template-columns: minmax(0, 1fr) 42px;
}

.conversation-workspace .message.user .bubble {
  order: 1;
  justify-self: end;
  max-width: min(620px, 86%);
  border-color: color-mix(in oklab, var(--accent) 38%, var(--border));
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 18%, var(--surface)), color-mix(in oklab, var(--surface-warm) 92%, var(--bg)));
  color: var(--fg);
  box-shadow: none;
}

.conversation-workspace .message.user .message-avatar {
  order: 2;
}

.conversation-workspace .message.user .bubble.has-attachments {
  display: grid;
  align-items: stretch;
  gap: var(--space-3);
  padding: var(--space-4);
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent) 18%, var(--surface)), color-mix(in oklab, var(--surface-warm) 92%, var(--bg)));
  box-shadow: none;
}

.conversation-workspace .message.user .bubble.has-attachments .bubble-text {
  padding: 0;
  background: transparent;
  box-shadow: none;
}

.conversation-workspace .message.assistant .bubble {
  max-width: 760px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--fg-2);
  box-shadow: none;
  white-space: normal;
}

.conversation-workspace .bubble {
  display: grid;
  gap: var(--space-3);
  max-width: 760px;
  min-width: 0;
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--fg-2);
  line-height: 1.72;
}

.conversation-workspace .bubble > p,
.conversation-workspace .bubble > ul,
.conversation-workspace .bubble > ol,
.conversation-workspace .bubble > blockquote {
  margin: 0 0 var(--space-3);
}

.conversation-workspace .bubble > :last-child {
  margin-bottom: 0;
}

.conversation-workspace .bubble-text {
  white-space: pre-wrap;
}

.conversation-workspace .message-meta,
.conversation-workspace .message-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--muted);
  font-size: var(--text-xs);
}

.conversation-workspace .message-footer {
  justify-content: flex-end;
  flex-wrap: wrap;
  padding-top: var(--space-2);
  border-top: 1px solid var(--border);
}

.conversation-workspace .message-usage {
  display: inline-flex;
  gap: var(--space-2);
  margin-right: auto;
}

.conversation-workspace .message-copy-btn,
.conversation-workspace .message-share-btn {
  min-height: 30px;
  padding: 6px 10px;
  font-size: var(--text-xs);
}

.conversation-workspace .message-copy-btn svg {
  width: 15px;
  height: 15px;
}

.conversation-workspace .message-share-actions {
  grid-column: 1 / -1;
  justify-self: end;
  margin-top: calc(var(--space-3) * -1);
}

.conversation-workspace .bubble code {
  padding: 2px 5px;
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: .92em;
}

.conversation-workspace .message.assistant .bubble p,
.conversation-workspace .message.assistant .bubble ul,
.conversation-workspace .message.assistant .bubble ol {
  color: var(--fg-2);
}

.conversation-workspace .message.assistant .bubble h1,
.conversation-workspace .message.assistant .bubble h2,
.conversation-workspace .message.assistant .bubble h3,
.conversation-workspace .message.assistant .bubble h4,
.conversation-workspace .message.assistant .bubble strong {
  color: var(--fg);
}

.conversation-workspace .message.assistant .bubble code {
  background: var(--bg);
  color: var(--fg);
}

.conversation-workspace .message.assistant .bubble blockquote {
  border-left: 2px solid var(--accent);
  background: color-mix(in oklab, var(--surface-warm) 70%, var(--surface));
  color: var(--muted);
}

.conversation-workspace .message.assistant .bubble table,
.conversation-workspace .message.assistant .bubble th,
.conversation-workspace .message.assistant .bubble td {
  border-color: var(--border);
}

.conversation-workspace .message.assistant .bubble th {
  background: color-mix(in oklab, var(--surface-warm) 70%, var(--surface));
  color: var(--fg);
}

.conversation-workspace .bubble pre {
  overflow: auto;
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
  color: var(--fg-2);
}

.conversation-workspace .message.assistant .bubble pre,
.conversation-workspace .message.assistant .bubble pre code {
  background: var(--bg);
  color: var(--fg-2);
}

.conversation-workspace .message.assistant .bubble pre.mermaid {
  background: var(--surface-warm);
  border-color: var(--border);
}

.conversation-workspace .bubble blockquote {
  padding-left: var(--space-4);
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

.conversation-workspace .thinking-block,
.conversation-workspace .sub-agent-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--surface-warm) 70%, var(--surface));
}

.conversation-workspace .thinking-block summary,
.conversation-workspace .sub-agent-block summary {
  cursor: pointer;
  padding: var(--space-3);
  color: var(--muted);
  font-size: var(--text-sm);
  font-weight: 650;
}

.conversation-workspace .thinking-content,
.conversation-workspace .sub-agent-thinking,
.conversation-workspace .sub-agent-output {
  padding: 0 var(--space-3) var(--space-3);
  color: var(--muted);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
}

.conversation-workspace .tool-use-tag,
.conversation-workspace .file-download-tag,
.conversation-workspace .ask-user-question-form,
.conversation-workspace .ask-user-question-summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--surface-warm) 62%, var(--surface));
  color: var(--fg-2);
  font-size: var(--text-sm);
  text-decoration: none;
}

.conversation-workspace .tool-use-tag svg,
.conversation-workspace .file-download-tag svg {
  flex: 0 0 16px;
}

.conversation-workspace .bubble-images,
.conversation-workspace .bubble-files {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.conversation-workspace .bubble-image,
.conversation-workspace .image-preview-thumb {
  width: 96px;
  height: 72px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.conversation-workspace .attachment-pill,
.conversation-workspace .bubble-file-link,
.conversation-workspace .file-preview-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 30px;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--surface-warm);
  color: var(--fg-2);
  font-size: var(--text-xs);
  text-decoration: none;
}

.conversation-workspace .file-preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.conversation-workspace .file-preview-grid.compact {
  grid-template-columns: 1fr;
}

.conversation-workspace .file-preview-remove {
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.conversation-workspace .welcome-card {
  display: grid;
  gap: var(--space-5);
  max-width: 980px;
  margin: 0 auto;
  padding: var(--space-8);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--accent) 10%, transparent), transparent 42%),
    color-mix(in oklab, var(--surface) 94%, var(--bg));
}

.conversation-workspace .welcome-card h2 {
  margin-top: var(--space-2);
  color: var(--fg);
  font-size: 32px;
  line-height: 1.1;
}

.conversation-workspace .welcome-card p {
  margin-top: var(--space-2);
  color: var(--muted);
}

.conversation-workspace .mode-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.conversation-workspace .mode-card {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: color-mix(in oklab, var(--surface) 92%, var(--bg));
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.conversation-workspace .mode-card.active {
  border-color: color-mix(in oklab, var(--accent-2) 60%, var(--border));
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent-2) 10%, transparent), color-mix(in oklab, var(--surface) 94%, var(--bg)));
}

.conversation-workspace .mode-card strong {
  color: var(--fg);
}

.conversation-workspace .mode-meta {
  color: var(--meta);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.conversation-workspace .composer {
  position: sticky;
  bottom: 0;
  padding: var(--space-4) var(--space-6) var(--space-5);
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, var(--bg) 18%);
}

.conversation-workspace .composer-box {
  display: grid;
  gap: var(--space-3);
  max-width: 980px;
  margin: 0 auto;
  padding: var(--space-3);
  border: 1px solid color-mix(in oklab, var(--accent) 34%, var(--border));
  border-radius: var(--radius-lg);
  background: color-mix(in oklab, var(--surface) 96%, var(--bg));
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.26);
}

.conversation-workspace .composer textarea {
  width: 100%;
  min-height: 74px;
  max-height: 220px;
  border: 0;
  background: transparent;
  color: var(--fg);
  outline: 0;
  resize: vertical;
  line-height: var(--leading-body);
}

.conversation-workspace .composer textarea::placeholder {
  color: var(--muted);
}

.conversation-workspace .composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.conversation-workspace .composer-actions .actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.conversation-workspace .composer-actions .actions:last-child {
  margin-left: auto;
}

.conversation-workspace .drawer-backdrop {
  display: none;
}

.conversation-workspace .typing-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.conversation-workspace .typing-indicator span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--muted);
  animation: typing-bounce 900ms infinite ease-in-out;
}

.conversation-workspace .typing-indicator span:nth-child(2) {
  animation-delay: 120ms;
}

.conversation-workspace .typing-indicator span:nth-child(3) {
  animation-delay: 240ms;
}

@keyframes typing-bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: .45; }
  40% { transform: translateY(-4px); opacity: 1; }
}

@media (max-width: 1180px) {
  .conversation-workspace {
    grid-template-columns: 76px 280px minmax(0, 1fr);
  }

  .conversation-workspace .mode-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 920px) {
  .conversation-workspace {
    grid-template-columns: 1fr;
  }

  .conversation-workspace .workspace-nav,
  .conversation-workspace .context-column {
    position: fixed;
    top: 0;
    bottom: 0;
    z-index: 34;
    transform: translateX(-104%);
    transition: transform var(--motion-base) var(--ease-standard);
  }

  .conversation-workspace .workspace-nav {
    left: 0;
    width: 86px;
  }

  .conversation-workspace .context-column {
    left: 86px;
    width: min(330px, calc(100vw - 86px));
  }

  body.nav-open .conversation-workspace .workspace-nav,
  body.nav-open .conversation-workspace .context-column {
    transform: translateX(0);
  }

  .conversation-workspace .workspace-mobile-actions {
    display: flex;
  }

  .conversation-workspace .workspace-topbar {
    padding: var(--space-3) var(--space-4);
  }

  .conversation-workspace .workspace-content {
    padding: var(--space-4);
  }

  .conversation-workspace .composer {
    padding: var(--space-3);
  }

  .conversation-workspace .message,
  .conversation-workspace .message.user {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .conversation-workspace .message.user .bubble,
  .conversation-workspace .message.user .message-avatar {
    order: initial;
    justify-self: stretch;
  }

  .conversation-workspace .drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 20;
    background: color-mix(in oklab, var(--bg) 24%, transparent);
    backdrop-filter: blur(4px);
  }

  body.nav-open .conversation-workspace .drawer-backdrop {
    display: block;
  }
}

@media (max-width: 620px) {
  .conversation-workspace .workspace-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .conversation-workspace .agent-bar,
  .conversation-workspace .top-actions,
  .conversation-workspace .actions,
  .conversation-workspace .actions .btn {
    width: 100%;
  }

  .conversation-workspace .workspace-content,
  .conversation-workspace .welcome-card {
    padding: var(--space-4);
  }

  .conversation-workspace .composer-box {
    border-radius: var(--radius-md);
  }

  .conversation-workspace .composer-actions,
  .conversation-workspace .kb-context-bar,
  .conversation-workspace .run-status-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .conversation-workspace .run-step.quiet {
    margin-left: 0;
  }

  .conversation-workspace .file-preview-grid {
    grid-template-columns: 1fr;
  }

  .conversation-workspace .bubble {
    max-width: none;
    padding: var(--space-3);
  }
}