/**
 * Application Component Styles
 * 
 * Styles for chat messages, tool blocks, forms, and UI components.
 * refs: journal/05_ui_design_spec.md
 */

/* ===========================================
   LOADING SCREEN
   =========================================== */

.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-screen--hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-color);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===========================================
   BASE STYLES
   =========================================== */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
  font-size: 13px;
  line-height: 1.5;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

/* Panel dimensions as CSS variables */
:root {
  --threads-width: 180px;
  --header-height: 38px;
}

/* ===========================================
   CHAT MESSAGES
   =========================================== */

.chat-messages {
  padding: 10px;
}

/* User Message Bubble */
.user-message {
  display: flex;
  justify-content: flex-end;
  align-items: flex-start;
  gap: 6px;
  margin-bottom: 10px;
}

.user-bubble {
  max-width: 75%;
  padding: 8px 12px;
  background: var(--blue);
  color: white;
  border-radius: 12px 12px 3px 12px;
  font-size: 12px;
}

.user-bubble--pending {
  opacity: 0.7;
}

/* Rollback button for user messages */
.rollback-btn {
  width: 22px;
  height: 22px;
  padding: 0;
  margin-top: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  opacity: 1;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.rollback-btn:hover {
  opacity: 1;
  background: rgba(220, 50, 47, 0.15);
  border-color: rgba(220, 50, 47, 0.3);
  color: var(--red);
}

/* Assistant Block */
.assistant-block {
  margin-bottom: 10px;
}

/* ===========================================
   TOOL EXECUTION BLOCK
   =========================================== */

.tool-block {
  background: var(--bg-secondary);
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  margin-bottom: 6px;
  overflow: hidden;
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  font-size: 10px;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
}

.tool-header:hover {
  background: rgba(0, 0, 0, 0.03);
}

.tool-collapse-toggle {
  font-size: 8px;
  color: var(--text-muted);
  width: 10px;
  flex-shrink: 0;
}

.tool-icon {
  font-size: 9px;
}

.tool-icon--running {
  color: var(--cyan);
}

.tool-icon--complete {
  color: var(--green);
}

.tool-icon--error {
  color: var(--red);
}

.tool-name {
  color: var(--text-primary);
  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
  font-size: 10px;
}

.tool-content {
  padding: 4px 6px;
  border-top: 1px solid var(--border-subtle);
}

/* ===========================================
   REASONING BLOCK
   =========================================== */

.reasoning-block {
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  margin-bottom: 6px;
  overflow: hidden;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.reasoning-block:hover {
  background: var(--bg-elevated);
  border-color: var(--border-color);
}

.reasoning-header {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 8px;
  cursor: pointer;
  font-size: 10px;
  color: var(--text-secondary);
  background: transparent;
  transition: color 0.15s ease;
}

.reasoning-block:hover .reasoning-header {
  color: var(--text-primary);
}

.reasoning-toggle {
  font-size: 8px;
  transition: transform 0.2s ease;
}

.reasoning-block--collapsed .reasoning-toggle {
  transform: rotate(-90deg);
}

.reasoning-content {
  padding: 6px 8px 8px;
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.5;
  background: transparent;
  border-top: 1px solid var(--border-subtle);
}

.reasoning-block--collapsed .reasoning-content {
  display: none;
}

/* ===========================================
   REPLY TEXT
   =========================================== */

.reply-text {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.reply-text p {
  margin-bottom: 8px;
}

.reply-text p:last-child {
  margin-bottom: 0;
}

.reply-text strong {
  color: var(--base02);
}

.reply-text code {
  background: var(--bg-secondary);
  padding: 1px 4px;
  border-radius: 3px;
  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
  font-size: 11px;
}

.reply-text pre {
  background: var(--bg-secondary);
  padding: 8px;
  border-radius: 4px;
  overflow-x: auto;
  margin: 8px 0;
}

.reply-text pre code {
  background: none;
  padding: 0;
}

/* ===========================================
   PLAN STATUS BLOCK
   =========================================== */

.plan-status {
  padding: 6px 10px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.plan-status-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 8px;
  background: var(--bg-elevated);
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.plan-status-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 500;
}

.plan-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 9px;
  font-weight: 600;
  color: white;
}

.plan-badge--draft { background: var(--base1); }
.plan-badge--approved { background: var(--green); }
.plan-badge--running { background: var(--cyan); }
.plan-badge--paused { background: var(--orange); }
.plan-badge--blocked { background: var(--red); }
.plan-badge--done { background: var(--base1); }
.plan-badge--aborted { background: var(--red); }
.plan-badge--failed { background: var(--red); }

.plan-badge-icon {
  margin-right: 2px;
}

.plan-status-label--clickable {
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.plan-status-label--clickable:hover {
  opacity: 0.8;
}

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

.plan-action-btn {
  padding: 3px 8px;
  font-size: 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.plan-action-btn:hover {
  background: var(--blue);
  border-color: var(--blue);
  color: white;
}

.plan-action-btn--danger:hover {
  background: var(--red);
  border-color: var(--red);
}

/* Plan Steps Display */
.plan-steps-block {
  background: var(--bg-secondary);
  border-radius: 4px;
  padding: 8px;
  margin-bottom: 8px;
}

.plan-steps-header {
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-secondary);
  font-size: 10px;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 0;
  font-size: 11px;
}

.step-icon {
  font-size: 10px;
}

.step-icon--done { color: var(--green); }
.step-icon--running { color: var(--cyan); }
.step-icon--pending { color: var(--text-muted); }
.step-icon--failed { color: var(--red); }

.step-text {
  color: var(--text-primary);
}

.step-text--pending {
  color: var(--text-muted);
}

/* ===========================================
   QA BLOCK
   =========================================== */

.qa-block {
  background: rgba(181, 137, 0, 0.06);
  border: 1px solid var(--yellow);
  border-radius: 4px;
  padding: 10px;
  margin: 6px 10px;
}

.qa-progress {
  font-size: 9px;
  color: var(--yellow);
  font-weight: 600;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.qa-question {
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.qa-options {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.qa-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 11px;
}

.qa-option:hover {
  border-color: var(--blue);
  background: rgba(38, 139, 210, 0.05);
}

.qa-option-key {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue);
  color: white;
  border-radius: 3px;
  font-weight: 700;
  font-size: 9px;
  flex-shrink: 0;
}

.qa-skip {
  margin-top: 8px;
  padding: 5px 8px;
  background: transparent;
  border: 1px dashed var(--border-color);
  color: var(--text-muted);
  border-radius: 3px;
  cursor: pointer;
  font-size: 10px;
  transition: all 0.15s ease;
  width: 100%;
}

.qa-skip:hover {
  border-color: var(--text-secondary);
  color: var(--text-secondary);
}

/* ===========================================
   QA RESULT BLOCK
   refs: journal/11_qa_answer_block_design.md
   =========================================== */

.qa-result-block {
  background: rgba(181, 137, 0, 0.06);
  border: 1px solid var(--yellow);
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 8px;
}

.qa-result-block--pending {
  opacity: 0.7;
}

.qa-result-block--error {
  border-color: var(--red);
}

.qa-result__question {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.qa-result__question-label {
  flex-shrink: 0;
  font-weight: 600;
  color: var(--yellow);
}

.qa-result__answer {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.4;
}

.qa-result__answer-label {
  flex-shrink: 0;
  font-weight: 600;
  color: var(--yellow);
}

.qa-result__skipped-badge {
  display: inline-block;
  padding: 1px 5px;
  background: var(--bg-secondary);
  border-radius: 3px;
  font-size: 9px;
  color: var(--text-muted);
}

.qa-result__spinner {
  width: 12px;
  height: 12px;
  border: 2px solid var(--border-color);
  border-top-color: var(--yellow);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.qa-result__error {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
  font-size: 10px;
}

.qa-result__error-icon {
  color: var(--red);
}

.qa-result__error-message {
  color: var(--red);
  flex: 1;
}

.qa-result__retry-btn {
  padding: 3px 8px;
  background: var(--red);
  border: none;
  border-radius: 3px;
  color: white;
  font-size: 9px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.qa-result__retry-btn:hover {
  background: #e5423f;
}

/* ===========================================
   CHAT INPUT AREA
   =========================================== */

.chat-input-area {
  padding: 8px 10px 10px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.chat-textarea {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  resize: none;
  transition: all 0.15s ease;
}

.chat-textarea:focus {
  outline: none;
  border-color: var(--blue);
}

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

.chat-textarea:disabled {
  background: var(--bg-secondary);
  cursor: not-allowed;
}

.chat-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 12px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Toggle Button (Chat/Build) */
.toggle-btn {
  display: flex;
  padding: 2px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
}

.toggle-btn__option {
  padding: 3px 6px;
  border-radius: 2px;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  border: none;
  background: none;
}

.toggle-btn__option--active {
  background: var(--blue);
  color: white;
}

/* Checkbox Label */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
}

.checkbox-label input {
  width: 12px;
  height: 12px;
  accent-color: var(--blue);
}

/* Send Button */
.send-btn {
  padding: 6px 14px;
  background: var(--blue);
  border: none;
  border-radius: 4px;
  color: white;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.send-btn:hover {
  background: var(--interactive-hover);
}

.send-btn--stop {
  background: var(--red);
}

.send-btn--stop:hover {
  background: #e5423f;
}

.send-btn:disabled {
  background: var(--base1);
  cursor: not-allowed;
}

/* Preset Dropdown */
.preset-dropdown {
  position: relative;
}

.preset-btn {
  padding: 4px 8px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  border-color: var(--blue);
  color: var(--text-primary);
}

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

.preset-menu {
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  min-width: 160px;
  max-height: 280px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
}

.preset-item {
  padding: 8px 12px;
  cursor: pointer;
  font-size: 11px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.1s ease;
}

.preset-item:hover {
  background: var(--bg-secondary);
}

.preset-item:first-child {
  border-radius: 3px 3px 0 0;
}

.preset-item:last-child {
  border-radius: 0 0 3px 3px;
}

/* ===========================================
   APPROVAL BLOCK
   =========================================== */

.approval-block {
  background: rgba(181, 137, 0, 0.06);
  border: 1px solid var(--yellow);
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 8px;
}

.approval-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  color: var(--yellow);
  margin-bottom: 8px;
  font-size: 11px;
}

.approval-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  background: var(--bg-elevated);
  border-radius: 3px;
  margin-bottom: 4px;
}

.approval-item:last-child {
  margin-bottom: 0;
}

.approval-item-info {
  display: flex;
  align-items: center;
  gap: 6px;
}

.approval-item-type {
  padding: 2px 5px;
  background: var(--bg-secondary);
  border-radius: 2px;
  font-size: 8px;
  color: var(--cyan);
  font-weight: 600;
  text-transform: uppercase;
}

.approval-item-name {
  font-size: 10px;
}

.approval-item-actions {
  display: flex;
  gap: 4px;
}

.approval-btn {
  padding: 3px 8px;
  font-size: 9px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.approval-btn--approve {
  background: var(--green);
  border: none;
  color: white;
}

.approval-btn--reject {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.approval-btn--reject:hover {
  background: var(--red);
  border-color: var(--red);
  color: white;
}

/* ===========================================
   ERROR BLOCK
   =========================================== */

.error-block {
  background: rgba(220, 50, 47, 0.06);
  border: 1px solid var(--red);
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 8px;
}

.error-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  color: var(--red);
  margin-bottom: 6px;
  font-size: 11px;
}

.error-message {
  font-size: 11px;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.error-actions {
  display: flex;
  gap: 6px;
}

.error-action-btn {
  padding: 4px 10px;
  font-size: 10px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.error-action-btn--retry {
  background: var(--red);
  border: none;
  color: white;
}

.error-action-btn--copy {
  background: var(--bg-secondary);
  border: none;
  color: var(--text-secondary);
}

/* ===========================================
   COMPOSITE PANEL COMPONENTS
   =========================================== */

.component-group {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-bottom: 6px;
  overflow: hidden;
}

.component-group--invalid {
  border-color: var(--orange);
}

.component-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  background: var(--bg-secondary);
  cursor: pointer;
  transition: background 0.15s ease;
}

.component-header:hover {
  background: rgba(0, 0, 0, 0.03);
}

.component-title {
  display: flex;
  align-items: center;
  gap: 6px;
}

.component-toggle {
  font-size: 8px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.component-group--collapsed .component-toggle {
  transform: rotate(-90deg);
}

.component-name {
  font-weight: 500;
  font-size: 11px;
}

.component-status {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 9px;
  padding: 2px 6px;
  border-radius: 8px;
}

.component-status--valid {
  background: rgba(133, 153, 0, 0.12);
  color: var(--green);
}

.component-status--invalid {
  background: rgba(203, 75, 22, 0.12);
  color: var(--orange);
}

.component-status--blocked {
  background: var(--bg-primary);
  color: var(--text-muted);
}

.component-status--ready {
  background: var(--bg-primary);
  color: var(--text-secondary);
}

.component-body {
  padding: 8px;
  border-top: 1px solid var(--border-subtle);
}

.component-group--collapsed .component-body {
  display: none;
}

.component-description {
  font-size: 9px;
  color: var(--text-muted);
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--border-subtle);
}

/* Validation Warning */
.validation-warning {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  background: rgba(203, 75, 22, 0.08);
  border: 1px solid rgba(203, 75, 22, 0.2);
  border-radius: 3px;
  margin-bottom: 8px;
  font-size: 10px;
}

.validation-warning__icon {
  color: var(--orange);
  font-size: 11px;
}

.validation-warning__text {
  flex: 1;
  color: var(--orange);
}

.resolve-btn {
  padding: 3px 8px;
  background: var(--orange);
  border: none;
  border-radius: 3px;
  color: white;
  font-size: 9px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.resolve-btn:hover {
  background: #e65c21;
}

/* ===========================================
   FORM FIELDS
   =========================================== */

.field-group {
  margin-bottom: 8px;
}

.field-label {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 9px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 3px;
}

.required-mark {
  color: var(--red);
}

.field-input {
  width: 100%;
  padding: 5px 7px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 11px;
  font-family: inherit;
  transition: border-color 0.15s ease;
}

.field-input:focus {
  outline: none;
  border-color: var(--blue);
}

.field-input--invalid {
  border-color: var(--red);
}

.field-input:disabled {
  background: var(--bg-secondary);
  cursor: not-allowed;
}

.field-textarea {
  min-height: 44px;
  resize: vertical;
}

.field-error {
  font-size: 9px;
  color: var(--red);
  margin-top: 3px;
}

/* List Control */
.list-control {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.list-add-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 4px;
  background: transparent;
  border: none;
  border-bottom: 1px dashed var(--border-color);
  color: var(--blue);
  font-size: 9px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.list-add-btn:hover {
  background: rgba(38, 139, 210, 0.05);
}

.list-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.list-item:last-child {
  border-bottom: none;
}

.list-item-input {
  flex: 1;
  padding: 4px 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  color: var(--text-primary);
  font-size: 10px;
}

.list-item-remove {
  padding: 2px 5px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  transition: color 0.15s ease;
}

.list-item-remove:hover {
  color: var(--red);
}

/* ===========================================
   HIERARCHY EDITOR
   refs: journal/13_curriculum_hierarchy_redesign.md
   =========================================== */

.hierarchy-editor {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.hierarchy-loading,
.hierarchy-error,
.hierarchy-empty {
  padding: 12px;
  text-align: center;
  font-size: 10px;
  color: var(--text-muted);
}

.hierarchy-error {
  color: var(--red);
}

.hierarchy-levels {
  padding: 8px;
}

.hierarchy-level {
  margin-bottom: 8px;
}

.hierarchy-level:last-child {
  margin-bottom: 0;
}

.hierarchy-level-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.hierarchy-level-row:last-child {
  margin-bottom: 0;
}

.hierarchy-level-label {
  min-width: 80px;
  font-size: 9px;
  font-weight: 500;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.hierarchy-input {
  flex: 1;
  padding: 5px 7px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  color: var(--text-primary);
  font-size: 10px;
}

.hierarchy-input:focus {
  outline: none;
  border-color: var(--blue);
}

/* ===========================================
   SNAPSHOT HISTORY
   =========================================== */

.snapshot-list {
  padding: 6px;
}

.snapshot-empty {
  padding: 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 11px;
}

.snapshot-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 8px 10px;
  margin-bottom: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.snapshot-item:hover {
  border-color: var(--blue);
  background: rgba(38, 139, 210, 0.03);
}

.snapshot-item--selected {
  border-color: var(--blue);
  background: rgba(38, 139, 210, 0.08);
}

.snapshot-item__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 3px;
}

.snapshot-item__title {
  font-weight: 500;
  font-size: 11px;
  color: var(--text-primary);
}

.snapshot-item__time {
  font-size: 10px;
  color: var(--text-muted);
  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

.snapshot-item__preview {
  font-size: 10px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.snapshot-item__actions {
  display: flex;
  gap: 4px;
}

.snapshot-btn {
  padding: 3px 8px;
  font-size: 9px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.snapshot-btn--restore {
  background: var(--blue);
  border: none;
  color: white;
}

.snapshot-btn--restore:hover {
  background: var(--interactive-hover);
}

.snapshot-btn--cancel {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.snapshot-btn--cancel:hover {
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

/* Header button variants */
.header-btn--disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.header-btn--primary {
  background: var(--blue);
  border-color: var(--blue);
  color: white;
  padding: 4px 10px;
  font-size: 10px;
}

.header-btn--primary:hover {
  background: var(--interactive-hover);
}

/* ===========================================
   SESSION RESUMED INDICATOR
   refs: specs/frontend/resumability.md
   =========================================== */

.session-indicator {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
  color: var(--text-muted);
  font-size: 11px;
}

.session-indicator .indicator-line {
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.session-indicator .indicator-text {
  flex-shrink: 0;
  padding: 0 8px;
}

/* ===========================================
   LLM DEBUG PANEL
   =========================================== */

.llm-section-summary {
  cursor: pointer;
  font-weight: 500;
  font-size: 10px;
}

.llm-pre-wrapper {
  position: relative;
}

.llm-pre-wrapper .copy-btn {
  position: absolute;
  top: 8px;
  right: 4px;
  z-index: 1;
}

.copy-btn {
  padding: 2px 6px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 3px;
  cursor: pointer;
  font-size: 10px;
  line-height: 1;
  transition: all 0.15s ease;
  opacity: 0.7;
}

.copy-btn:hover {
  background: var(--bg-elevated);
  border-color: var(--blue);
  opacity: 1;
}

/* ===========================================
   UTILITY CLASSES
   =========================================== */

.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}