* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Dark theme (default) ────────────────────────────────────── */
:root {
  --bg-primary:     #1a1a1a;
  --bg-secondary:   #252525;
  --bg-tertiary:    #333;
  --border:         #444;
  --text-primary:   #e0e0e0;
  --text-secondary: #888;
  --accent:         #60a5fa;
  --accent-hover:   #93c5fd;
  --success:        #10b981;
  --warning:        #f59e0b;
  --danger:         #ef4444;
}

/* ── Light theme overrides ───────────────────────────────────── */
html[data-theme="light"] {
  --bg-primary:     #f4f4f2;
  --bg-secondary:   #e8e8e5;
  --bg-tertiary:    #d8d8d4;
  --border:         #b4b4b0;
  --text-primary:   #1a1a18;
  --text-secondary: #5a5a56;
  --accent:         #2563eb;
  --accent-hover:   #1d4ed8;
  --success:        #059669;
  --warning:        #d97706;
  --danger:         #dc2626;
}

/* ── Base ────────────────────────────────────────────────────── */
body {
  font-family: "SF Mono", "Cascadia Code", "JetBrains Mono", "Fira Code",
    Monaco, "Courier New", monospace;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  font-size: 13px;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Header ──────────────────────────────────────────────────── */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  -webkit-app-region: drag;
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  -webkit-app-region: no-drag;
}

/* App wordmark */
.app-wordmark {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
  padding-right: 12px;
  border-right: 1px solid var(--border);
  margin-right: 4px;
  user-select: none;
  white-space: nowrap;
}

.header select,
.header button {
  padding: 5px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
}

.header button:hover {
  background: var(--border);
}

.header button.btn-delete {
  background: transparent;
  border: 1px solid var(--border);
  padding: 5px 8px;
  font-size: 13px;
}

.header button.btn-delete:hover {
  background: var(--danger);
  border-color: var(--danger);
}

.header button.btn-rename {
  background: transparent;
  border: 1px solid var(--border);
  padding: 5px 8px;
  font-size: 13px;
}

.header button.btn-rename:hover {
  background: var(--bg-tertiary);
}

/* Theme toggle */
.theme-toggle {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: lowercase;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.theme-toggle:hover {
  opacity: 1;
  background: var(--bg-tertiary) !important;
}

/* Phase indicator */
.phase-indicator {
  display: flex;
  gap: 4px;
}

.phase-step {
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  border-radius: 2px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: none;
  font-family: inherit;
}

/* Reachable phases rendered as <button> — add pointer + hover */
button.phase-step {
  cursor: pointer;
}

button.phase-step:hover {
  filter: brightness(1.15);
}

.phase-step.active {
  background: var(--accent);
  color: white;
}

.phase-step.complete {
  background: var(--success);
  color: white;
}

/* Viewing a historical artifact: outline on the viewed badge */
.phase-step.viewing {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* ── Branch Badge ────────────────────────────────────────────── */
.branch-badge {
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: 0.04em;
  border-radius: 2px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.branch-badge:hover:not(:disabled) {
  background: var(--border);
  color: var(--text-primary);
  border-color: var(--accent);
}

.branch-badge.branch-copied {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

/* ── Main Layout (sidebar + content row) ─────────────────────── */
.main-layout {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── Main Content (document + chat row) ──────────────────────── */
.main-content {
  flex: 1;
  display: flex;
  overflow: hidden;
}

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

.sidebar.collapsed {
  width: 32px !important;
  align-items: center;
  padding-top: 8px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  user-select: none;
}

.sidebar-header-actions {
  display: flex;
  gap: 4px;
}

.sidebar-action-btn,
.sidebar-collapse-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  padding: 2px 5px;
  border-radius: 2px;
  line-height: 1;
  transition: background 0.1s, color 0.1s;
}

.sidebar-action-btn:hover,
.sidebar-collapse-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.sidebar-tree {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

/* ── Sidebar Resize Handle ───────────────────────────────────── */
.sidebar-resize-handle {
  width: 5px;
  background: transparent;
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.15s;
}

.sidebar-resize-handle:hover {
  background: var(--accent);
}

/* ── Project Items ───────────────────────────────────────────── */
.project-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 10px;
  cursor: default;
  user-select: none;
  gap: 4px;
}

.project-item:hover {
  background: var(--bg-tertiary);
}

.project-item.selected {
  background: var(--bg-tertiary);
}

.project-name {
  flex: 1;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-primary);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.project-item.selected .project-name {
  color: var(--accent);
}

/* ── Session Items ───────────────────────────────────────────── */
.session-item {
  display: flex;
  align-items: center;
  padding: 4px 10px 4px 22px;
  gap: 4px;
  user-select: none;
}

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

.session-item.selected {
  background: var(--bg-tertiary);
  border-left: 2px solid var(--accent);
  padding-left: 20px;
}

.session-name {
  flex: 1;
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 5px;
}

.session-item.selected .session-name {
  color: var(--text-primary);
}

/* ── Activity dot ────────────────────────────────────────────── */
.session-activity-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  animation: activity-pulse 1.8s ease-in-out infinite;
}

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

/* ── Shared item controls (shown on hover) ───────────────────── */
.item-controls {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.1s;
}

.project-item:hover .item-controls,
.session-item:hover .item-controls {
  opacity: 1;
}

.session-item.selected .item-controls {
  opacity: 1;
}

.item-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 11px;
  font-family: inherit;
  padding: 1px 4px;
  border-radius: 2px;
  line-height: 1.4;
  transition: background 0.1s, color 0.1s;
}

.item-btn:hover {
  background: var(--bg-primary);
  color: var(--text-primary);
}

.item-btn-danger:hover {
  background: var(--danger);
  color: white;
}

/* ── Sidebar empty states ────────────────────────────────────── */
.sidebar-empty {
  font-size: 11px;
  color: var(--text-secondary);
  font-style: italic;
  padding: 10px 12px;
  text-align: center;
}

.session-empty {
  padding: 4px 10px 4px 22px;
  text-align: left;
}

/* ── Sidebar scrollbar ───────────────────────────────────────── */
.sidebar-tree::-webkit-scrollbar {
  width: 4px;
}

.sidebar-tree::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-tree::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 2px;
}

/* ── Session rename input (in sidebar) ───────────────────────── */
.session-rename-input {
  flex: 1;
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border: 1px solid var(--accent);
  border-radius: 2px;
  color: var(--text-primary);
  font-size: 12px;
  font-family: inherit;
  min-width: 0;
  outline: none;
  box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.2);
}

html[data-theme="light"] .session-rename-input {
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

/* ── Document Pane ───────────────────────────────────────────── */
.document-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  min-width: 0;
  overflow: hidden;
}

.document-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.document-header button {
  padding: 3px 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 11px;
  font-family: inherit;
  letter-spacing: 0.05em;
}

.document-header button:hover {
  background: var(--border);
}

.document-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.document-content.editing {
  font-family: inherit;
  font-size: 13px;
  line-height: 1.6;
  background: var(--bg-primary);
  border: none;
  resize: none;
  color: var(--text-primary);
}

.codemirror-editor {
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.codemirror-editor .cm-editor {
  height: 100%;
  max-width: 100%;
}

.codemirror-editor .cm-scroller {
  overflow: auto !important;
}

.codemirror-editor .cm-gutters {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
}

.document-content.rendered {
  line-height: 1.7;
}

.document-content.rendered h1 {
  font-size: 22px;
  margin: 24px 0 16px;
  letter-spacing: -0.01em;
}
.document-content.rendered h2 {
  font-size: 17px;
  margin: 20px 0 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.document-content.rendered h3 {
  font-size: 14px;
  margin: 16px 0 8px;
}
.document-content.rendered p {
  margin: 8px 0;
  line-height: 1.6;
}
.document-content.rendered code {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 2px;
  font-size: 12px;
  font-family: inherit;
}
.document-content.rendered pre {
  background: var(--bg-tertiary);
  padding: 16px;
  border-radius: 2px;
  overflow-x: auto;
  margin: 16px 0;
}
.document-content.rendered pre code {
  background: none;
  padding: 0;
}
.document-content.rendered ul,
.document-content.rendered ol {
  margin: 12px 0;
  padding-left: 24px;
}
.document-content.rendered li {
  margin-bottom: 6px;
  line-height: 1.5;
}
.document-content.rendered ul.contains-task-list {
  list-style: none;
  padding-left: 0;
}
.document-content.rendered li.task-list-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.document-content.rendered li.task-list-item input[type="checkbox"] {
  margin-top: 4px;
}
.document-content.rendered table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 12px;
}
.document-content.rendered th,
.document-content.rendered td {
  padding: 8px 12px;
  text-align: left;
  border: 1px solid var(--border);
}
.document-content.rendered th {
  background: var(--bg-tertiary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 11px;
}
.document-content.rendered tr:nth-child(even) td {
  background: var(--bg-secondary);
}
.document-content.rendered blockquote {
  border-left: 3px solid var(--accent);
  margin: 16px 0;
  padding-left: 16px;
  color: var(--text-secondary);
}
.document-content.rendered hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}
.document-content.rendered a {
  color: var(--accent);
  text-decoration: none;
}
.document-content.rendered a:hover {
  text-decoration: underline;
}
.document-content.rendered .empty {
  color: var(--text-secondary);
  font-style: italic;
}

.badge {
  background: var(--accent);
  color: white;
  padding: 2px 8px;
  border-radius: 2px;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.badge-readonly {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* ── Chat Pane ───────────────────────────────────────────────── */
.chat-pane {
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  min-width: 0;
  overflow: hidden;
  transition: width 0.2s ease;
}

/* ── Chat Resize Handle ──────────────────────────────────────── */
.chat-resize-handle {
  width: 5px;
  background: transparent;
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.15s;
}

.chat-resize-handle:hover {
  background: var(--accent);
}

/* ── Chat Header Strip ───────────────────────────────────────── */
.chat-header {
  display: flex;
  justify-content: flex-start;
  gap: 8px;
  align-items: center;
  padding: 7px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.chat-collapse-btn {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 7px;
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
}

.chat-collapse-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.message {
  margin-bottom: 10px;
  padding: 9px 13px;
  border-radius: 4px;
  max-width: 90%;
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
}

.message.user {
  background: var(--accent);
  margin-left: auto;
  color: white;
}

.message.assistant {
  background: var(--bg-tertiary);
}

.message.loading {
  color: var(--text-secondary);
  font-style: italic;
  animation: thinking-pulse 1.8s ease-in-out infinite;
}

/* Flex row so the activity text and cancel × sit on one line */
.message.loading .message-content {
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: normal;
}

/* Cancel × button inside the Thinking bubble */
.loading-cancel-x {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0 2px;
  opacity: 0.45;
  flex-shrink: 0;
  font-family: inherit;
  transition: opacity 0.15s, color 0.15s;
}

.loading-cancel-x:hover {
  opacity: 1;
  color: var(--text-primary);
}

@keyframes thinking-pulse {
  0%, 100% { opacity: 0.55; }
  50%       { opacity: 1;    }
}

.chat-input {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
}

.chat-input input {
  flex: 1;
  padding: 9px 13px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.chat-input input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.2);
}

html[data-theme="light"] .chat-input input:focus {
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.chat-input button {
  padding: 9px 15px;
  background: var(--accent);
  border: none;
  border-radius: 2px;
  color: white;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: background 0.15s;
}

.chat-input button:hover:not(:disabled) {
  background: var(--accent-hover);
}

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

/* ── Action Bar ──────────────────────────────────────────────── */
.action-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.action-bar-left,
.action-bar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.token-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
}

.token-bar {
  width: 100px;
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 1px;
  overflow: hidden;
}

.token-fill {
  height: 100%;
  transition: width 0.3s ease;
}

.token-label {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.model-badge {
  font-size: 11px;
  font-family: var(--font-mono, monospace);
  color: var(--text-secondary);
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  white-space: nowrap;
  user-select: none;
}

.permission-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
  cursor: pointer;
}

.permission-toggle input {
  cursor: pointer;
}

.btn-secondary {
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  letter-spacing: 0.05em;
  transition: background 0.15s;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
}

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

.btn-primary {
  padding: 6px 18px;
  background: var(--accent);
  border: none;
  border-radius: 2px;
  color: white;
  cursor: pointer;
  font-weight: 600;
  font-size: 12px;
  font-family: inherit;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: background 0.15s;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

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

.implementing-status {
  color: var(--success);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── Error Bar ───────────────────────────────────────────────── */
.error-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: var(--danger);
  color: white;
  font-size: 12px;
  letter-spacing: 0.03em;
}

.error-bar button {
  background: none;
  border: none;
  color: white;
  font-size: 16px;
  cursor: pointer;
  padding: 0 4px;
}

.error-bar button:hover {
  opacity: 0.8;
}

/* ── Onboarding ──────────────────────────────────────────────── */
.onboarding h1 {
  font-size: 24px;
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.onboarding h2 {
  font-size: 13px;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.onboarding p {
  margin: 12px 0;
  line-height: 1.6;
}

.onboarding ol {
  margin: 12px 0 12px 24px;
}

.onboarding li {
  margin: 8px 0;
  line-height: 1.5;
}

.onboarding pre {
  background: var(--bg-tertiary);
  padding: 12px 16px;
  border-radius: 2px;
  margin: 12px 0;
}

.onboarding code {
  font-family: inherit;
  font-size: 12px;
}

.onboarding a {
  color: var(--accent);
  text-decoration: none;
}

.onboarding a:hover {
  text-decoration: underline;
}

.onboarding-tip {
  margin-top: 28px;
  padding: 16px;
  background: var(--bg-tertiary);
  border-left: 3px solid var(--accent);
  border-radius: 0 2px 2px 0;
}

/* ── Settings Overlay ────────────────────────────────────────── */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  -webkit-app-region: drag;
}

.settings-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  -webkit-app-region: no-drag;
}

.settings-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.settings-close {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 9px;
  font-family: inherit;
  -webkit-app-region: no-drag;
  transition: background 0.15s;
}

.settings-close:hover {
  background: var(--bg-tertiary);
}

.settings-body {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── Settings Side Nav ───────────────────────────────────────── */
.settings-nav {
  width: 180px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: 16px 0;
  flex-shrink: 0;
}

.settings-nav-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 8px 16px;
  background: none;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  transition: background 0.1s, color 0.1s;
}

.settings-nav-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.settings-nav-item.active {
  color: var(--text-primary);
  border-left-color: var(--accent);
  background: var(--bg-tertiary);
}

/* ── Settings Content Area ───────────────────────────────────── */
.settings-content {
  flex: 1;
  overflow-y: auto;
  padding: 32px 40px;
  max-width: 860px;
}

.settings-section-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.settings-section-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* ── Phase Tab Strip ─────────────────────────────────────────── */
.settings-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}

.settings-tab {
  padding: 6px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.1s;
}

.settings-tab:hover {
  color: var(--text-primary);
}

.settings-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Prompt Textarea ─────────────────────────────────────────── */
.settings-textarea {
  width: 100%;
  min-height: 420px;
  padding: 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 12px;
  line-height: 1.7;
  resize: vertical;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.settings-textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.15);
}

html[data-theme="light"] .settings-textarea:focus {
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.settings-textarea.is-custom {
  border-color: var(--warning);
}

/* ── Model Input ─────────────────────────────────────────────── */
.settings-model-input {
  width: 100%;
  padding: 6px 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-mono, monospace);
  box-sizing: border-box;
  transition: border-color 0.15s;
}
.settings-model-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Phase model override rows ───────────────────────────────── */
.settings-phase-model-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}

.settings-phase-model-row {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: center;
  gap: 8px;
}

.settings-phase-model-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.settings-phase-model-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── Settings Actions Row ────────────────────────────────────── */
.settings-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

.settings-custom-badge {
  margin-left: auto;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--warning);
}

/* ── Header Settings Button ──────────────────────────────────── */
.settings-btn {
  padding: 5px 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
}

.settings-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* ── Settings Toggle Row ─────────────────────────────────────── */
.settings-toggle-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.settings-toggle-label {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  cursor: pointer;
  flex: 1;
}

.settings-toggle-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.4;
}

.settings-toggle-hint {
  color: var(--text-secondary);
  font-size: 11px;
}

.settings-toggle-hint code {
  font-family: monospace;
  background: var(--bg-tertiary);
  padding: 1px 3px;
  border-radius: 2px;
}

/* The pill toggle switch */
.settings-toggle {
  flex-shrink: 0;
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: var(--border);
  position: relative;
  cursor: pointer;
  transition: background 0.2s;
  outline-offset: 2px;
}

.settings-toggle:focus-visible {
  outline: 2px solid var(--accent);
}

.settings-toggle::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: transform 0.2s, background 0.2s;
}

.settings-toggle.on {
  background: var(--accent);
}

.settings-toggle.on::after {
  transform: translateX(16px);
  background: #fff;
}

/* ── Header Maximize Button ──────────────────────────────────── */
.maximize-btn {
  padding: 5px 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
  transition: background 0.15s, color 0.15s;
}

.maximize-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* ── Scrollbars ──────────────────────────────────────────────── */
.chat-messages::-webkit-scrollbar,
.document-content::-webkit-scrollbar,
.cm-scroller::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.chat-messages::-webkit-scrollbar-track,
.document-content::-webkit-scrollbar-track,
.cm-scroller::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

.chat-messages::-webkit-scrollbar-thumb,
.document-content::-webkit-scrollbar-thumb,
.cm-scroller::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
  border: 2px solid var(--bg-primary);
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.document-content::-webkit-scrollbar-thumb:hover,
.cm-scroller::-webkit-scrollbar-thumb:hover {
  background: var(--border);
}

/* ── MCP Settings ────────────────────────────────────────────── */
.mcp-server-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.mcp-empty {
  color: var(--text-secondary);
  font-size: 12px;
  font-style: italic;
  padding: 12px;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: 4px;
}

.mcp-server-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.mcp-server-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1;
}

.mcp-server-name {
  font-weight: 600;
  font-size: 13px;
  color: var(--text-primary);
}

.mcp-server-type {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  color: var(--text-secondary);
}

.mcp-server-detail {
  font-size: 11px;
  color: var(--text-secondary);
  font-family: var(--font-mono, monospace);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

.mcp-server-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.mcp-error {
  padding: 8px 12px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 4px;
  color: #ef4444;
  font-size: 12px;
  margin-top: 12px;
}

.mcp-server-form {
  margin-top: 16px;
  padding: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.mcp-form-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.mcp-form-field {
  margin-bottom: 14px;
}

.mcp-form-field label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.mcp-form-field input,
.mcp-form-field select {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-mono, monospace);
  box-sizing: border-box;
}

.mcp-form-field input:focus,
.mcp-form-field select:focus {
  outline: none;
  border-color: var(--accent);
}

.mcp-form-field select {
  cursor: pointer;
}

.mcp-array-builder,
.mcp-kv-builder {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mcp-array-row {
  display: flex;
  gap: 6px;
}

.mcp-array-row input {
  flex: 1;
}

.mcp-kv-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.mcp-kv-row input:first-child {
  flex: 0 0 35%;
}

.mcp-kv-row input:nth-child(3) {
  flex: 1;
}

.mcp-kv-sep {
  color: var(--text-secondary);
  font-family: var(--font-mono, monospace);
  font-size: 13px;
}

.btn-icon {
  width: 28px;
  height: 28px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  flex-shrink: 0;
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-small {
  padding: 4px 8px;
  font-size: 11px;
}

.btn-danger {
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.mcp-form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* MCP Server Card with Tools */
.mcp-server-card {
  display: flex;
  flex-direction: column;
  padding: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.mcp-server-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mcp-tools-section {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.mcp-tools-header {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.mcp-tools-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mcp-tool-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 12px;
  cursor: pointer;
}

.mcp-tool-item input[type="checkbox"] {
  margin-top: 2px;
  cursor: pointer;
}

.mcp-tool-name {
  font-family: var(--font-mono, monospace);
  color: var(--text-primary);
  font-weight: 500;
}

.mcp-tool-desc {
  color: var(--text-secondary);
  font-size: 11px;
  margin-left: 4px;
}

/* ── New Session Modal ───────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 400px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.modal-close {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-secondary);
  font-size: 14px;
  width: 22px;
  height: 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.modal-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: 20px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-prompt {
  font-size: 12px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.phase-cards {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.phase-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 3px;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
  width: 100%;
}

.phase-card:hover {
  border-color: var(--accent);
  background: var(--bg-tertiary);
}

.phase-card.selected {
  border-color: var(--accent);
  background: var(--bg-tertiary);
}

.phase-card-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.phase-card.selected .phase-card-label {
  color: var(--accent);
}

.phase-card-desc {
  font-size: 11px;
  color: var(--text-secondary);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}

.modal-btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 2px;
  color: var(--text-secondary);
  font-size: 12px;
  padding: 5px 12px;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
}

.modal-btn-secondary:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-btn-primary {
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 2px;
  color: #fff;
  font-size: 12px;
  padding: 5px 12px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  transition: background 0.15s;
}

.modal-btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.mcp-tools-empty {
  font-size: 11px;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 8px;
  padding: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  text-align: center;
}