:root {
  --background-base: #ffffff;
  --background-strong: #f8f9fa;
  --background-stronger: #f1f3f4;
  --text-base: #202124;
  --text-strong: #000000;
  --text-weaker: #5f6368;
  --border-weak-base: #dadce0;
  --icon-strong-base: #202124;
  --surface-strong: #ffffff;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-stronger);
  color: var(--text-base);
  line-height: 1.5;
}

#app {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: auto;
}

.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: 1rem;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-weak-base);
  border-top: 3px solid var(--text-base);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {{ transform: rotate(0deg); }}
  100% {{ transform: rotate(360deg); }}
}

.error-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: var(--background-base);
}

.error-content {
  text-align: center;
  max-width: 400px;
  padding: 2rem;
}

.error-content h1 {
  color: var(--text-strong);
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.error-content p {
  color: var(--text-weaker);
  margin-bottom: 2rem;
}

.error-content a {
  color: var(--text-base);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-weak-base);
  border-radius: 4px;
  transition: background-color 0.2s;
}

.error-content a:hover {
  background-color: var(--background-strong);
}

.header {
  height: 48px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--background-base);
  border-bottom: 1px solid var(--border-weak-base);
  flex-shrink: 0;
}

.header h1 {
  font-size: 1.2rem;
  font-weight: 600;
}

.header-actions {
  display: flex;
  gap: 12px;
}

.header-actions button {
  padding: 6px 12px;
  border: 1px solid var(--border-weak-base);
  background-color: transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.header-actions button:hover {
  background-color: var(--background-strong);
}

.content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: auto;
}

.session-info {
  padding: 24px;
  background-color: var(--background-base);
  border-bottom: 1px solid var(--border-weak-base);
}

.session-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-strong);
  margin-bottom: 8px;
}

.session-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--text-weaker);
}

.session-messages {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
}

.session-stats {
  padding: 16px 24px;
  background-color: var(--background-base);
  border-bottom: 1px solid var(--border-weak-base);
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
}

.stat-label {
  color: var(--text-weaker);
}

.stat-value {
  color: var(--text-strong);
  font-weight: 600;
  font-family: monospace;
}

.message {
  margin-bottom: 24px;
  padding: 16px;
  background-color: var(--background-base);
  border-radius: 8px;
  border: 1px solid var(--border-weak-base);
}

.message-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 8px;
}

.message-role {
  font-weight: 600;
  color: var(--text-strong);
  background-color: var(--background-strong);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 0.875rem;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--text-weaker);
  flex-wrap: wrap;
}

.message-model {
  background-color: var(--background-strong);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: monospace;
}

.message-time {
  font-family: monospace;
}

.message-tokens {
  background-color: var(--background-strong);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: monospace;
}

.message-content {
  line-height: 1.6;
  white-space: pre-wrap;
  color: var(--text-base);
  font-family: monospace;
}

.message-content.has-rich-content {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.message-content p {
  margin: 0 0 1em 0;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content strong {
  font-weight: 600;
  color: var(--text-strong);
}

.message-content code {
  background-color: var(--background-strong);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: monospace;
  font-size: 0.9em;
}

.message-content pre {
  background-color: var(--background-stronger);
  border: 1px solid var(--border-weak-base);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  margin: 8px 0;
  font-family: monospace;
  font-size: 0.875rem;
  line-height: 1.4;
}

.message-content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

.diff-container {
  padding: 24px;
  background-color: var(--background-base);
  border-top: 1px solid var(--border-weak-base);
}

.diff-header {
  font-weight: 600;
  margin-bottom: 16px;
}

.diff-file {
  margin-bottom: 24px;
  border: 1px solid var(--border-weak-base);
  border-radius: 6px;
  overflow: hidden;
}

.diff-file-name {
  padding: 8px 12px;
  background-color: var(--background-strong);
  border-bottom: 1px solid var(--border-weak-base);
  font-family: monospace;
  font-size: 0.875rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.diff-stats {
  font-size: 0.75rem;
  color: var(--text-weaker);
}

.diff-stats::before {
  content: ' ';
}

.diff-content {
  padding: 0;
  background-color: var(--background-base);
}

.diff-split-view {
  display: flex;
  border-top: 1px solid var(--border-weak-base);
  background-color: var(--background-base);
}

.diff-side {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.diff-side-header {
  padding: 8px 12px;
  background-color: var(--background-strong);
  border-bottom: 1px solid var(--border-weak-base);
  font-family: monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-weaker);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.diff-side-content {
  flex: 1;
  overflow: auto;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.8125rem;
  line-height: 1.6;
}

.diff-side-content .diff-row {
  border-bottom: 1px solid var(--border-weak-base);
  min-height: 1.6em;
}

.diff-divider {
  width: 1px;
  background-color: var(--border-weak-base);
  flex-shrink: 0;
}

.diff-row {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border-weak-base);
  min-height: 1.6em;
}

.diff-row:last-child {
  border-bottom: none;
}

.diff-row.unchanged {
  background-color: transparent;
  color: var(--text-weaker);
}

.diff-row.unchanged:hover {
  background-color: var(--background-strong);
}

.diff-row.removed {
  background-color: #ffebe9;
}

.diff-row.removed:hover {
  background-color: #ffdce0;
}

.diff-row.added {
  background-color: #e6ffec;
}

.diff-row.added:hover {
  background-color: #ccffd8;
}

.diff-row.empty {
  background-color: transparent;
}

.diff-row.empty:hover {
  background-color: transparent;
}

.diff-line-num {
  min-width: 50px;
  text-align: right;
  padding: 0 10px 0 12px;
  color: var(--text-weaker);
  font-size: 0.75rem;
  line-height: 1.6;
  user-select: none;
  flex-shrink: 0;
  background-color: rgba(0, 0, 0, 0.02);
}

.diff-cell {
  flex: 1;
  padding: 0 8px;
  white-space: pre;
  overflow-x: auto;
  min-width: 0;
  line-height: 1.6;
}

.diff-row.empty .diff-cell {
  background-color: transparent;
}

.diff-line {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border-weak-base);
  min-height: 1.6em;
}

.diff-line:last-child {
  border-bottom: none;
}

.diff-line-number {
  min-width: 50px;
  text-align: right;
  padding-right: 10px;
  color: var(--text-weaker);
  user-select: none;
  flex-shrink: 0;
}

.diff-marker {
  min-width: 20px;
  text-align: center;
  color: var(--text-weaker);
  font-weight: bold;
  flex-shrink: 0;
  user-select: none;
}

.diff-text {
  flex: 1;
  white-space: pre;
  overflow-x: auto;
}

.diff-line.added {
  background-color: #e6ffec;
}

.diff-line.added .diff-marker {
  color: #22863a;
}

.diff-line.removed {
  background-color: #ffebe9;
}

.diff-line.removed .diff-marker {
  color: #cb2431;
}

.diff-line.unchanged {
  background-color: transparent;
}

.diff-line.unchanged .diff-marker {
  color: transparent;
}

.diff-line.modified {
  display: block;
  background-color: #fbf3db;
}

.diff-line.modified .diff-line-old {
  background-color: rgba(247, 232, 194, 0.3);
}

.diff-line.modified .diff-line-new {
  background-color: rgba(222, 246, 229, 0.3);
}

.diff-line-old {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.diff-line-old .diff-marker {
  color: #cb2431;
}

.diff-line-new {
  display: flex;
  align-items: stretch;
}

.diff-line-new .diff-marker {
  color: #22863a;
}

.diff-line-modified {
  display: block;
  background-color: #fbf3db;
}

.diff-line-old {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.diff-line-old .diff-marker {
  color: #cb2431;
}

.diff-line-new {
  display: flex;
  align-items: stretch;
}

.diff-line-new .diff-marker {
  color: #22863a;
}

.diff-context-summary {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  background-color: var(--background-strong);
  color: var(--text-weaker);
  font-size: 0.75rem;
  border-bottom: 1px solid var(--border-weak-base);
  user-select: none;
  cursor: pointer;
  transition: background-color 0.2s;
}

.diff-context-summary:hover {
  background-color: var(--background-stronger);
}

.diff-context-line {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  background-color: var(--background-strong);
  color: var(--text-weaker);
  font-size: 0.75rem;
  border-bottom: 1px solid var(--border-weak-base);
  user-select: none;
}

.diff-line-unchanged {
  background-color: transparent;
  color: var(--text-weaker);
  padding: 2px 0;
  display: flex;
  align-items: stretch;
}

.diff-line-unchanged .diff-line-number {
  color: #d0d7de;
}

/* Legacy styles for backward compatibility */
.diff-line-added {
  background-color: #e6ffed;
  color: #24292e;
}

.diff-line-removed {
  background-color: #ffeef0;
  color: #24292e;
}

.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.no-scrollbar::-webkit-scrollbar {
  display: none;
}

/* Tool Call Styles */
.tool-call {
  margin: 16px 0;
  border: 1px solid var(--border-weak-base);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--background-base);
  transition: box-shadow 0.2s ease;
}

.tool-call:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--background-strong) 0%, var(--background-stronger) 100%);
  border-bottom: 1px solid var(--border-weak-base);
}

.tool-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.tool-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-strong);
  flex: 1;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.tool-status {
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex-shrink: 0;
}

.status-completed {
  background-color: #d4edda;
  color: #155724;
}

.status-failed, .status-error {
  background-color: #f8d7da;
  color: #721c24;
}

.status-running, .status-in-progress {
  background-color: #fff3cd;
  color: #856404;
}

.status-pending {
  background-color: #e2e3e5;
  color: #383d41;
}

.tool-details {
  padding: 16px;
}

.tool-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-weaker);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.tool-input {
  margin-bottom: 16px;
  padding: 12px;
  background-color: var(--background-strong);
  border-radius: 6px;
  border-left: 3px solid #6c757d;
}

.tool-inline-code {
  background-color: var(--background-stronger);
  padding: 4px 8px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  color: var(--text-base);
}

.tool-command {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  background-color: #1e1e1e;
  border-radius: 4px;
  margin-bottom: 8px;
}

.tool-command .prompt {
  color: #4ec9b0;
  font-weight: 600;
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.9rem;
  user-select: none;
}

.tool-command code {
  flex: 1;
  color: #dcdcaa;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  background: none;
  padding: 0;
}

.tool-description {
  font-size: 0.875rem;
  color: var(--text-weaker);
  font-style: italic;
}

.tool-json {
  margin: 0;
  background-color: var(--background-stronger);
  border: 1px solid var(--border-weak-base);
  border-radius: 4px;
  padding: 8px;
  font-size: 0.8125rem;
  overflow-x: auto;
}

.tool-output {
  margin-bottom: 16px;
}

.tool-output-collapsible {
  border: 1px solid var(--border-weak-base);
  border-radius: 6px;
  overflow: hidden;
}

.tool-output-collapsible .tool-label {
  padding: 8px 12px;
  background-color: var(--background-strong);
  border-bottom: 1px solid var(--border-weak-base);
  margin-bottom: 0;
}

.tool-expand-btn {
  background: none;
  border: none;
  color: #007bff;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background-color 0.2s;
  font-weight: 500;
}

.tool-expand-btn:hover {
  background-color: rgba(0, 123, 255, 0.1);
}

.tool-expand-btn .collapse-text {
  display: none;
}

.tool-output-collapsible.expanded .expand-text {
  display: none;
}

.tool-output-collapsible.expanded .collapse-text {
  display: inline;
}

.output-preview,
.output-full {
  padding: 12px;
  background-color: var(--background-stronger);
  border-radius: 0 0 6px 6px;
}

.output-preview pre,
.output-full pre {
  margin: 0;
  padding: 0;
  background: none;
  border: none;
}

.tool-output pre {
  margin: 0;
  padding: 12px;
  background-color: var(--background-stronger);
  border-radius: 6px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.8125rem;
  line-height: 1.4;
  overflow-x: auto;
}

.tool-output pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  color: var(--text-base);
}

.tool-metadata {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 12px;
  border-top: 1px solid var(--border-weak-base);
  font-size: 0.8125rem;
}

.exit-success {
  color: #28a745;
  font-weight: 600;
}

.exit-error {
  color: #dc3545;
  font-weight: 600;
}

.tool-duration {
  color: var(--text-weaker);
  font-family: monospace;
}

/* Reasoning Block Styles */
.reasoning-block {
  margin: 16px 0;
  border: 1px solid var(--border-weak-base);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--background-base);
}

.reasoning-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #fff3cd 0%, #ffeeba 100%);
  border-bottom: 1px solid var(--border-weak-base);
  cursor: pointer;
  transition: background-color 0.2s;
}

.reasoning-header:hover {
  background: linear-gradient(135deg, #ffeeba 0%, #ffd89b 100%);
}

.reasoning-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.reasoning-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: #856404;
  flex: 1;
  font-family: 'Segoe UI', system-ui, sans-serif;
}

.reasoning-toggle {
  background: rgba(133, 100, 4, 0.1);
  border: none;
  color: #856404;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 4px 12px;
  border-radius: 12px;
  transition: background-color 0.2s;
  font-weight: 500;
}

.reasoning-toggle:hover {
  background: rgba(133, 100, 4, 0.2);
}

.reasoning-content {
  padding: 12px;
  background-color: var(--background-strong);
}

.reasoning-content pre {
  margin: 0;
  padding: 12px;
  background-color: var(--background-stronger);
  border-radius: 6px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  overflow-x: auto;
}

.reasoning-content code {
  background: none;
  padding: 0;
  border-radius: 0;
}

/* Step Marker Styles */
.step-marker {
  margin: 12px 0;
  padding: 10px 16px;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.875rem;
  display: inline-block;
}

.step-start {
  background-color: #e7f3ff;
  color: #004085;
  border-left: 3px solid #0056b3;
}

.step-complete {
  background-color: #d4edda;
  color: #155724;
  border-left: 3px solid #28a745;
}

/* Animations */
.tool-expand-btn {
  transition: all 0.2s ease;
}

.tool-output-collapsible.expanded .output-preview {
  display: none !important;
}

.tool-output-collapsible.expanded .output-full {
  display: block !important;
}