:root {
  --sidebar-width: 260px;
  --bg: #FAFAF8;
  --bg-sidebar: #F4F4F5;
  --bg-sidebar-hover: #E4E4E7;
  --bg-input: #FFFFFF;
  --bg-bubble-user: #F4F4F5;
  --bg-bubble-assistant: #FFFFFF;
  --text: #18181B;
  --text-secondary: #71717A;
  --text-tertiary: #A1A1AA;
  --border: #E5E5E5;
  --border-strong: #D4D4D8;
  --accent: #18181B;
  --accent-hover: #3F3F46;
  --accent-soft: #E4E4E7;
  --danger: #DC2626;
  --success: #16A34A;
  --warning: #F59E0B;
  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.06);
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: ui-serif, Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 180ms;
}

[data-theme="dark"] {
  --bg: #0d0d0d;
  --bg-sidebar: #111111;
  --bg-sidebar-hover: #1a1a1a;
  --bg-input: #1e1e1e;
  --bg-bubble-user: #1e1e1e;
  --bg-bubble-assistant: #111111;
  --text: #e8e8e8;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --border: #27272a;
  --border-strong: #3f3f46;
  --accent: #e8e8e8;
  --accent-hover: #ffffff;
  --accent-soft: #27272a;
  --shadow: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

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

.sidebar-header {
  padding: 16px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
}

.new-chat {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
}

.new-chat:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text);
}

.new-project-btn {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.new-project-btn:hover { background: var(--bg-sidebar-hover); color: var(--text); }

.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 12px 10px;
}

.sidebar-section {
  margin-bottom: 16px;
}

.sidebar-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  padding: 0 8px 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
}

.sidebar-label svg {
  flex-shrink: 0;
}

.room-item {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-bottom: 1px;
  cursor: pointer;
}

.room-link {
  display: block;
  flex: 1;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--duration) var(--ease-out);
  margin-bottom: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.room-link:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text);
}

.room-link.active {
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
}

.room-menu-btn {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 5px;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
}

.room-item:hover .room-menu-btn { display: flex; }
.room-menu-btn:hover { background: var(--bg-sidebar-hover); color: var(--text); }

.project-chip {
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg);
  border-left: 3px solid var(--project-color, var(--text-tertiary));
  cursor: default;
  margin-bottom: 4px;
}

.project-empty {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  padding: 0 4px;
}

.search-form {
  display: flex;
  gap: 6px;
  padding: 0 8px;
}

.search-form input {
  flex: 1;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-input);
  font-size: 0.85rem;
}

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.sidebar-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  display: block;
  padding: 4px 0;
}

.sidebar-footer a:hover { color: var(--text); }

/* ─── Main ─── */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg);
}

.topbar {
  height: 56px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg);
  flex-shrink: 0;
}

.topbar-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.topbar-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 2px rgba(22,163,74,0.15);
  animation: pulse 2s infinite;
}

.status-dot.offline { background: var(--danger); box-shadow: 0 0 0 2px rgba(220,38,38,0.15); animation: none; }

/* ─── Chat area ─── */
.chat {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0;
  scroll-behavior: smooth;
}

.messages {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 24px;
}

.message {
  display: flex;
  gap: 14px;
  padding: 24px 0;
  animation: fadeIn 0.35s var(--ease-out) both;
  border-bottom: 1px solid transparent;
}

.message + .message {
  border-top: 1px solid var(--border);
}

.message.user { flex-direction: row-reverse; }

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.message-content {
  max-width: 85%;
  min-width: 0;
}

.message.user .message-content { align-items: flex-end; display: flex; flex-direction: column; }

.message-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.message.user .message-header { flex-direction: row-reverse; }

.message-name {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text);
}

.message-time {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.bubble {
  background: var(--bg-bubble-assistant);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 16px 20px;
  font-size: 0.95rem;
  line-height: 1.6;
  box-shadow: var(--shadow);
  word-wrap: break-word;
}

.message.user .bubble {
  background: var(--bg-bubble-user);
  border-color: transparent;
}

.bubble p { margin: 0 0 0.6em; }
.bubble p:last-child { margin-bottom: 0; }
.bubble code {
  font-family: var(--font-mono);
  background: rgba(0,0,0,0.05);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.85em;
}
.code-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin: 0.8em 0;
  background: #f4f4f5;
}

[data-theme="dark"] .code-block {
  background: #111111;
  border-color: #27272a;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(0,0,0,0.03);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem;
}

[data-theme="dark"] .code-header {
  background: rgba(255,255,255,0.03);
  border-bottom-color: #27272a;
}

.code-lang {
  color: var(--text-tertiary);
  font-family: var(--font-mono);
  text-transform: lowercase;
}

.copy-snippet {
  padding: 4px 8px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--duration) var(--ease-out);
}
.copy-snippet:hover { background: var(--accent-soft); color: var(--text); }

.bubble pre {
  position: relative;
  background: transparent;
  color: var(--text);
  padding: 14px;
  border-radius: 0;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin: 0;
}
.bubble pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.message-actions {
  display: flex;
  gap: 2px;
  margin-top: 8px;
  opacity: 0;
  transition: opacity var(--duration) var(--ease-out);
}

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

.action-btn {
  padding: 4px 8px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--duration) var(--ease-out);
}

.action-btn:hover {
  background: var(--accent-soft);
  color: var(--text);
}

.action-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.star-btn { font-size: 0.85rem; line-height: 1; }
.star-btn.starred { color: #F59E0B; }

/* ─── PDF preview ─── */
.pdf-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-input);
}
.pdf-preview object {
  display: block;
  min-height: 320px;
}

/* ─── Reactions ─── */
.reactions {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}

.reaction {
  background: var(--bg-bubble-user);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2px 8px;
  font-size: 0.85rem;
}

/* ─── Reasoning ─── */
.reasoning {
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  overflow: hidden;
}

.reasoning-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
}

.reasoning-header:hover { background: var(--bg-sidebar-hover); }

.reasoning-chevron { font-size: 0.7rem; transition: transform var(--duration) var(--ease-out); }
.reasoning.open .reasoning-chevron { transform: rotate(90deg); }
.reasoning-status {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-tertiary);
}
.reasoning-status.running { background: var(--warning); animation: pulse 1.5s infinite; }
.reasoning-status.done { background: var(--success); }
.reasoning-status.error { background: var(--danger); }
.reasoning-title { font-weight: 500; flex: 1; font-size: 0.85rem; }
.reasoning-count { font-size: 0.75rem; color: var(--text-tertiary); }
.reasoning-body {
  display: none;
  padding: 0 12px 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.reasoning.open .reasoning-body { display: block; }

.reasoning-step {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.reasoning-step:last-child { border-bottom: none; }
.reasoning-step-title { font-weight: 500; color: var(--text); }
.reasoning-step-detail { margin-top: 2px; }
.reasoning-step-status { font-size: 0.75rem; margin-top: 2px; }

/* ─── Thread panel ─── */
.thread-panel {
  margin-top: 12px;
  padding: 12px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.diff-panel {
  margin-top: 10px;
  padding: 12px;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
}

.diff-removed {
  background: rgba(220, 38, 38, 0.08);
  color: var(--danger);
  text-decoration: line-through;
  padding: 1px 3px;
  border-radius: 3px;
}

.diff-added {
  background: rgba(22, 163, 74, 0.08);
  color: var(--success);
  padding: 1px 3px;
  border-radius: 3px;
}

.thread-reply-form {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}

.thread-reply-form input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-input);
}

/* ─── Composer ─── */
.composer {
  padding: 12px 16px 24px;
  background: transparent;
  flex-shrink: 0;
}

.composer-inner {
  max-width: 768px;
  margin: 0 auto;
}

.composer-box {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  transition: border-color var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.composer-box:focus-within {
  border-color: var(--border-strong);
  box-shadow: 0 4px 24px rgba(0,0,0,0.12);
}

[data-theme="dark"] .composer-box:focus-within {
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
}

.composer-box.dragover {
  border-color: var(--accent);
  background: var(--bg-sidebar-hover);
}

.composer textarea {
  width: 100%;
  border: none;
  background: transparent;
  resize: none;
  outline: none;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text);
  min-height: 26px;
  max-height: 200px;
  padding: 0;
}

.composer textarea::placeholder { color: var(--text-tertiary); }

.composer-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-top: 12px;
}

.composer-left {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.composer-select {
  padding: 6px 8px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text-tertiary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--duration) var(--ease-out);
}

.composer-select:hover { background: var(--bg-sidebar-hover); }

.attach-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
}

.attach-btn:hover { background: var(--accent-soft); color: var(--text); }
.attach-btn.listening { background: var(--danger); color: #fff; animation: pulse 1.2s infinite; }

.send-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
  flex-shrink: 0;
}

.send-btn:hover:not(:disabled) { background: var(--accent-hover); }
.send-btn:disabled { opacity: 0.35; cursor: default; }

.attachment-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-sidebar);
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-decoration: none;
}

.attachment-chip .remove {
  cursor: pointer;
  color: var(--text-tertiary);
}

.attachment-chip .remove:hover { color: var(--danger); }

.attachment-media {
  margin-top: 8px;
  max-width: 320px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.attachment-media img,
.attachment-media video {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ─── Typing indicator ─── */
.typing {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.typing-spinner {
  width: 16px;
  height: 16px;
  color: #d97757;
  animation: spin 1.2s linear infinite;
}

.typing-label { font-weight: 500; }

/* ─── Empty state ─── */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 auto;
}

.empty-state .empty-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.empty-state h2 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--text);
}

.empty-state p {
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 24px;
}

.empty-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

.empty-action {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration) var(--ease-out);
}

.empty-action:hover {
  background: var(--accent-soft);
  border-color: var(--border-strong);
}

.empty-hints {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.empty-hints span {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* ─── Animations ─── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0.6); }
  40% { transform: scale(1); }
}

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

/* ─── Autonomous panel ─── */
.autonomous-panel {
  padding: 12px;
  border-top: 1px solid var(--border);
}

.autonomous-panel textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-input);
  font-family: inherit;
  font-size: 0.85rem;
  resize: vertical;
  min-height: 60px;
}

.panel-row {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.panel-row select {
  flex: 1;
  padding: 5px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-input);
  font-size: 0.8rem;
}

.panel-btn {
  width: 100%;
  margin-top: 8px;
  padding: 8px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-weight: 500;
  cursor: pointer;
}

.panel-btn:hover { background: var(--accent-hover); }
.panel-btn:disabled { opacity: 0.5; }

.notice {
  margin-top: 8px;
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
}
.notice.success { background: rgba(22,163,74,0.1); color: var(--success); }
.notice.error { background: rgba(220,38,38,0.1); color: var(--danger); }

.settings-panel {
  position: absolute;
  top: 56px;
  right: 16px;
  width: 260px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  padding: 12px;
  z-index: 100;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--text);
}

.toggle {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-sidebar-hover);
  border-radius: 22px;
  transition: background var(--duration) var(--ease-out);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background: var(--bg-input);
  border-radius: 50%;
  transition: transform var(--duration) var(--ease-out);
}

.toggle input:checked + .toggle-slider {
  background: var(--success);
}

.toggle input:checked + .toggle-slider:before {
  transform: translateX(18px);
}

/* ─── Command palette ─── */
.command-palette {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration) var(--ease-out);
}
.command-palette.open {
  opacity: 1;
  pointer-events: auto;
}
.command-palette-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.18);
  backdrop-filter: blur(2px);
}
.command-palette-box {
  position: relative;
  width: min(560px, calc(100vw - 32px));
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg), 0 24px 48px rgba(0,0,0,0.12);
  overflow: hidden;
  transform: translateY(-12px) scale(0.98);
  transition: transform var(--duration) var(--ease-out);
}
.command-palette.open .command-palette-box {
  transform: translateY(0) scale(1);
}
.command-palette-box input {
  width: 100%;
  padding: 16px 18px;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font-sans);
}
.command-palette-box input::placeholder {
  color: var(--text-tertiary);
}
.command-list {
  max-height: 420px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
}
.command-group {
  padding: 8px 0;
}
.command-group-label {
  padding: 4px 18px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}
.command-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  cursor: pointer;
  transition: background var(--duration) var(--ease-out);
}
.command-item:hover,
.command-item.active {
  background: var(--bg-sidebar-hover);
}
.command-item-left {
  display: flex;
  align-items: center;
  gap: 12px;
}
.command-icon {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-sidebar);
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.command-item.active .command-icon {
  background: var(--accent-soft);
  color: var(--text);
}
.command-title {
  font-size: 0.95rem;
  color: var(--text);
}
.command-subtitle {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}
.command-kbd {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  background: var(--bg-sidebar);
  padding: 2px 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
}
.command-empty {
  padding: 24px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* ─── Stop button + reply quote + queue badge ─── */
.send-btn.stop {
  background: var(--danger);
  color: #fff;
}
.send-btn.stop:hover {
  background: #B91C1C;
}
.reply-preview {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  margin: 0 12px 6px;
  background: var(--bg-sidebar);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.reply-preview button {
  margin-left: auto;
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}
.queued-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--warning);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}
.composer-box { position: relative; }
.attachment-preview-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 4px 4px 0 0;
  padding: 4px 8px;
  background: var(--bg-sidebar);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.attachment-thumb {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--bg-input);
}
.attachment-preview-item video.attachment-thumb {
  display: block;
}

/* ─── Mobile responsive ─── */
.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1.1rem;
  padding: 4px 8px;
  cursor: pointer;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.25);
  z-index: 90;
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 280px;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    max-width: 85vw;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform var(--duration) var(--ease-out);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar.open ~ .sidebar-overlay {
    display: block;
  }

  .main {
    width: 100vw;
  }

  .topbar {
    padding: 10px 12px;
    gap: 8px;
  }

  .topbar-title {
    font-size: 0.95rem;
  }

  .topbar-meta {
    gap: 8px;
    font-size: 0.75rem;
  }

  .topbar-meta .action-btn {
    padding: 4px 8px;
    font-size: 0.75rem;
  }

  .messages {
    padding: 12px;
    gap: 14px;
  }

  .message {
    gap: 8px;
  }

  .avatar {
    width: 28px;
    height: 28px;
    font-size: 0.75rem;
  }

  .bubble {
    padding: 10px 13px;
    font-size: 0.95rem;
  }

  .composer {
    padding: 10px 12px 16px;
  }

  .composer-box {
    border-radius: 20px;
    padding: 12px 14px;
  }

  .composer-inner {
    max-width: 100%;
  }

  .composer-row {
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
  }

  .composer-left {
    flex-wrap: wrap;
    gap: 4px;
    flex: 1;
  }

  .composer-select {
    font-size: 0.75rem;
    padding: 4px 6px;
  }

  .send-btn {
    width: 34px;
    height: 34px;
  }

  .attach-btn {
    width: 32px;
    height: 32px;
  }

  .composer textarea {
    font-size: 0.95rem;
    min-height: 22px;
  }

  .settings-panel {
    right: 10px;
    top: 48px;
    width: auto;
    min-width: 200px;
  }

  .command-palette-box {
    width: calc(100vw - 24px);
    max-height: 70vh;
  }

  .thread-panel {
    margin-left: 0;
    padding-left: 12px;
  }
}

@media (max-width: 480px) {
  .topbar-meta #agent-count {
    display: none;
  }

  .topbar-meta {
    gap: 6px;
  }

  .message-content {
    max-width: 92%;
  }

  .message {
    padding: 16px 0;
  }

  .bubble {
    padding: 12px 14px;
    border-radius: 16px;
  }

  .composer-box {
    border-radius: 18px;
  }
}