:root {
      --bg-deep: #f5f3f0;
      --bg-surface: #ffffff;
      --bg-elevated: #fafafa;
      --bg-hover: #f0eeeb;
      --border-subtle: rgba(0,0,0,0.08);
      --border-medium: rgba(0,0,0,0.15);
      --text-primary: #1a1817;
      --text-secondary: #4a4745;
      --text-tertiary: #7a7572;
      --accent-warm: #c4703c;
      --accent-warm-dim: rgba(196,112,60,0.12);
      --accent-success: #2d8a5f;
      --accent-success-dim: rgba(45,138,95,0.12);
      --accent-warning: #a67c00;
      --accent-warning-dim: rgba(166,124,0,0.12);
      --accent-error: #c53d3d;
      --accent-error-dim: rgba(197,61,61,0.12);
      --accent-purple: #7c5cad;
      --accent-purple-dim: rgba(124,92,173,0.12);
      --card-bg: #ffffff;
      --card-text: #1a1817;
      --card-text-secondary: #4a4745;
      --card-border: #e0dcd7;
      --font-display: 'Fraunces', Georgia, serif;
      --font-body: 'Source Serif 4', Georgia, serif;
      --font-mono: 'JetBrains Mono', monospace;
      --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
      --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
      --focus-ring: 0 0 0 3px rgba(196,112,60,0.4);
    }

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

    html, body {
      height: 100%;
      overflow: hidden;
    }

    body {
      font-family: var(--font-body);
      background: var(--bg-deep);
      color: var(--text-primary);
      -webkit-font-smoothing: antialiased;
    }

    /* App Layout */
    .app {
      display: grid;
      grid-template-columns: 360px 1fr;
      /* Pin the row to the viewport: an implicit auto row grows to the
         sidebar's content height and pushes toasts/zoom/compare off-screen. */
      grid-template-rows: minmax(0, 1fr);
      height: 100vh;
    }

    /* Sidebar */
    .sidebar {
      background: var(--bg-surface);
      border-right: 1px solid var(--border-medium);
      display: flex;
      flex-direction: column;
      position: relative;
      z-index: 100;
      box-shadow: 2px 0 8px rgba(0,0,0,0.04);
    }

    .sidebar-header {
      padding: 28px 24px 20px;
      border-bottom: 1px solid var(--border-subtle);
    }

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

    .logo-icon {
      width: 28px;
      height: 28px;
      object-fit: contain;
    }

    .logo h1 {
      font-family: var(--font-display);
      font-size: 1.5rem;
      font-weight: 400;
      letter-spacing: -0.02em;
      color: var(--text-primary);
    }

    .logo span {
      font-family: var(--font-mono);
      font-size: 0.65rem;
      color: var(--text-tertiary);
      text-transform: uppercase;
      letter-spacing: 0.1em;
      align-self: flex-end;
      margin-bottom: 4px;
    }

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

    .sidebar-content::-webkit-scrollbar {
      width: 6px;
    }

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

    .sidebar-content::-webkit-scrollbar-thumb {
      background: var(--border-medium);
      border-radius: 3px;
    }

    /* Form Elements */
    .field {
      margin-bottom: 24px;
    }

    .field-label {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 10px;
    }

    .field-label span {
      font-family: var(--font-mono);
      font-size: 0.68rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-tertiary);
    }

    .field-label::after {
      content: '';
      flex: 1;
      height: 1px;
      background: var(--border-subtle);
    }

    .api-input {
      width: 100%;
      padding: 12px 14px;
      background: var(--bg-deep);
      border: 1px solid var(--border-subtle);
      border-radius: 8px;
      font-family: var(--font-mono);
      font-size: 0.8rem;
      color: var(--text-primary);
      transition: all 0.2s ease;
    }

    .api-input::placeholder {
      color: var(--text-tertiary);
    }

    .api-input:focus {
      outline: none;
      border-color: var(--accent-warm);
      box-shadow: var(--focus-ring);
    }

    .api-input:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 2px;
    }

    .source-textarea {
      width: 100%;
      min-height: 140px;
      padding: 16px;
      background: var(--bg-deep);
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
      font-family: var(--font-body);
      font-size: 0.95rem;
      line-height: 1.6;
      color: var(--text-primary);
      resize: vertical;
      transition: all 0.2s ease;
    }

    .source-textarea::placeholder {
      color: var(--text-tertiary);
      font-style: italic;
    }

    .source-textarea:focus {
      outline: none;
      border-color: var(--accent-warm);
      box-shadow: var(--focus-ring);
    }

    .source-textarea:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 2px;
    }

    /* Parameters Grid */
    .params-grid {
      display: grid;
      gap: 20px;
    }

    .param-slider {
      padding: 16px;
      background: var(--bg-elevated);
      border-radius: 10px;
      border: 1px solid var(--border-subtle);
    }

    .param-slider-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 14px;
    }

    .param-slider-label {
      font-family: var(--font-mono);
      font-size: 0.68rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-tertiary);
    }

    .param-slider-value {
      font-family: var(--font-display);
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--accent-warm);
    }

    .slider-track {
      position: relative;
      height: 6px;
      background: var(--bg-deep);
      border-radius: 3px;
      margin-bottom: 10px;
    }

    .slider-track input[type="range"] {
      position: absolute;
      width: 100%;
      height: 100%;
      -webkit-appearance: none;
      background: transparent;
      cursor: pointer;
    }

    .slider-track input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 18px;
      height: 18px;
      background: var(--accent-warm);
      border-radius: 50%;
      cursor: grab;
      box-shadow: 0 2px 8px rgba(232,167,108,0.4);
      transition: transform 0.15s var(--ease-spring);
    }

    .slider-track input[type="range"]::-webkit-slider-thumb:hover {
      transform: scale(1.15);
    }

    .slider-track input[type="range"]::-webkit-slider-thumb:active {
      cursor: grabbing;
      transform: scale(1.05);
    }

    .slider-labels {
      display: flex;
      justify-content: space-between;
      font-family: var(--font-mono);
      font-size: 0.62rem;
      color: var(--text-tertiary);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .param-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .param-select {
      padding: 14px 16px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
    }

    .param-select select {
      width: 100%;
      background: transparent;
      border: none;
      font-family: var(--font-body);
      font-size: 0.9rem;
      color: var(--text-primary);
      cursor: pointer;
      appearance: none;
    }

    .param-select select:focus {
      outline: none;
    }

    .param-select select:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 2px;
      border-radius: 4px;
    }

    .param-select option {
      background: var(--bg-elevated);
      color: var(--text-primary);
    }

    /* Buttons */
    .actions {
      display: flex;
      flex-direction: column;
      gap: 10px;
      margin-top: 8px;
    }

    .btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 14px 20px;
      border: none;
      border-radius: 10px;
      font-family: var(--font-display);
      font-size: 0.95rem;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.2s var(--ease-out-expo);
      min-height: 48px; /* Better touch target */
    }

    .btn:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 2px;
    }

    .btn-primary {
      background: var(--accent-warm);
      color: #ffffff;
    }

    .btn-primary:hover {
      background: #b5632f;
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(196,112,60,0.25);
    }

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

    .btn-primary:disabled {
      background: #d0ccc7;
      color: #8a8682;
      cursor: not-allowed;
      transform: none;
      box-shadow: none;
    }

    .btn-secondary {
      background: var(--bg-surface);
      color: var(--text-primary);
      border: 1px solid var(--border-medium);
    }

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

    .btn-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }

    /* Generation Panel */
    .generation-panel {
      display: none;
      margin-top: 24px;
      padding-top: 24px;
      border-top: 1px solid var(--border-subtle);
      animation: slideIn 0.4s var(--ease-out-expo);
    }

    .generation-panel.visible {
      display: block;
    }

    /* Analysis Box */
    .analysis-box {
      padding: 16px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
      margin-bottom: 20px;
    }

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

    .analysis-box h3 {
      font-family: var(--font-mono);
      font-size: 0.65rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--text-tertiary);
      margin-bottom: 12px;
    }

    .analysis-content {
      font-size: 0.88rem;
      line-height: 1.6;
      color: var(--text-secondary);
    }

    .analysis-loading {
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-tertiary);
      font-size: 0.85rem;
    }

    .analysis-loading .spinner {
      width: 18px;
      height: 18px;
      border: 2px solid var(--border-subtle);
      border-top-color: var(--accent-warm);
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }

    .analysis-result {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .analysis-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .analysis-tag {
      padding: 4px 10px;
      background: var(--accent-warm-dim);
      border-radius: 100px;
      font-family: var(--font-mono);
      font-size: 0.65rem;
      font-weight: 500;
      color: var(--accent-warm);
    }

    .analysis-summary {
      font-size: 0.88rem;
      line-height: 1.6;
      color: var(--text-secondary);
    }

    /* Suggestions List */
    .suggestions-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .suggestion-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 14px 16px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .suggestion-item:hover {
      background: var(--bg-hover);
      border-color: var(--accent-warm);
    }

    .suggestion-item.selected {
      background: var(--accent-warm-dim);
      border-color: var(--accent-warm);
    }

    .suggestion-checkbox {
      width: 18px;
      height: 18px;
      border: 2px solid var(--border-medium);
      border-radius: 4px;
      flex-shrink: 0;
      margin-top: 2px;
      position: relative;
      transition: all 0.15s ease;
    }

    .suggestion-item.selected .suggestion-checkbox {
      border-color: var(--accent-warm);
      background: var(--accent-warm);
    }

    .suggestion-item.selected .suggestion-checkbox::after {
      content: '';
      position: absolute;
      top: 2px;
      left: 5px;
      width: 5px;
      height: 9px;
      border: solid white;
      border-width: 0 2px 2px 0;
      transform: rotate(45deg);
    }

    .suggestion-content {
      flex: 1;
    }

    .suggestion-action {
      font-family: var(--font-body);
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-primary);
      margin-bottom: 4px;
    }

    .suggestion-detail {
      font-size: 0.82rem;
      color: var(--text-tertiary);
      line-height: 1.5;
    }

    /* Sidebar Footer */
    .sidebar-footer {
      padding: 16px 24px;
      border-top: 1px solid var(--border-subtle);
    }

    .hint {
      font-family: var(--font-mono);
      font-size: 0.65rem;
      color: var(--text-tertiary);
      text-align: center;
      line-height: 1.6;
    }

    /* Canvas Toolbar (top-right) */
    .canvas-toolbar {
      position: absolute;
      top: 24px;
      right: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
      z-index: 50;
    }

    .toolbar-btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 16px;
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 10px;
      font-family: var(--font-mono);
      font-size: 0.72rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s ease;
      box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    }

    .toolbar-btn:hover {
      background: var(--bg-hover);
      border-color: var(--accent-warm);
      color: var(--text-primary);
    }

    .toolbar-btn:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 2px;
    }

    .toolbar-btn.has-key {
      color: var(--accent-success);
      border-color: var(--accent-success);
    }

    .toolbar-btn.has-key:hover {
      background: var(--accent-success-dim);
    }

    /* API Key Modal */
    .modal-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      backdrop-filter: blur(4px);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 1000;
      animation: fadeIn 0.2s ease;
    }

    .modal-overlay.visible {
      display: flex;
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    .modal {
      background: var(--bg-surface);
      border-radius: 16px;
      padding: 32px;
      width: 100%;
      max-width: 420px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.2);
      animation: modalIn 0.3s var(--ease-out-expo);
    }

    @keyframes modalIn {
      from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    .modal h2 {
      font-family: var(--font-display);
      font-size: 1.3rem;
      font-weight: 500;
      margin-bottom: 8px;
      color: var(--text-primary);
    }

    .modal p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-bottom: 20px;
      line-height: 1.5;
    }

    .modal p a {
      color: var(--accent-warm);
      text-decoration: none;
    }

    .modal p a:hover {
      text-decoration: underline;
    }

    .modal .field {
      margin-bottom: 20px;
    }

    .modal-actions {
      display: flex;
      gap: 10px;
      justify-content: flex-end;
    }

    .modal-actions .btn {
      padding: 12px 20px;
      font-size: 0.9rem;
    }

    /* Canvas Area */
    .canvas-area {
      position: relative;
      background: var(--bg-deep);
      overflow: hidden;
    }

    /* Grid pattern background */
    .canvas-area::before {
      content: '';
      position: absolute;
      inset: 0;
      background-image:
        radial-gradient(circle at 1px 1px, rgba(0,0,0,0.08) 1px, transparent 0);
      background-size: 40px 40px;
      pointer-events: none;
    }

    .canvas {
      position: absolute;
      width: 20000px;
      height: 20000px;
      cursor: grab;
    }

    .canvas:active {
      cursor: grabbing;
    }

    /* Cards */
    .card {
      position: absolute;
      width: 320px;
      background: var(--card-bg);
      border-radius: 12px;
      border: 1px solid var(--card-border);
      box-shadow:
        0 1px 3px rgba(0,0,0,0.06),
        0 4px 12px rgba(0,0,0,0.08);
      cursor: move;
      user-select: none;
      transition: box-shadow 0.25s ease, transform 0.25s var(--ease-out-expo);
      overflow: hidden;
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--card-accent, var(--accent-warm));
    }

    .card:hover {
      box-shadow:
        0 2px 4px rgba(0,0,0,0.08),
        0 8px 24px rgba(0,0,0,0.12);
    }

    .card.dragging {
      box-shadow:
        0 4px 8px rgba(0,0,0,0.1),
        0 16px 32px rgba(0,0,0,0.15);
      z-index: 1000;
      transform: rotate(1deg);
    }

    .card.selected {
      outline: 3px solid var(--accent-warm);
      outline-offset: 2px;
    }

    .card.multi-selected {
      outline: 3px solid var(--accent-purple);
      outline-offset: 2px;
    }

    .card.multi-selected .select-badge {
      position: absolute;
      top: -12px;
      right: -12px;
      width: 28px;
      height: 28px;
      background: var(--accent-purple);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-mono);
      font-size: 0.75rem;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(124,92,173,0.4);
      z-index: 20;
    }

    .card:focus-visible {
      outline: 3px solid var(--accent-warm);
      outline-offset: 2px;
    }

    .card.source {
      --card-accent: var(--accent-success);
    }

    .card.variant {
      --card-accent: var(--accent-warm);
    }

    .card.generating {
      --card-accent: var(--accent-purple);
      opacity: 0.85;
    }

    .card.generating .card-content::after {
      content: '';
      display: inline-block;
      width: 4px;
      height: 14px;
      background: var(--accent-purple);
      margin-left: 4px;
      animation: blink 0.8s infinite;
    }

    @keyframes blink {
      0%, 50% { opacity: 1; }
      51%, 100% { opacity: 0; }
    }

    .card.error {
      --card-accent: var(--accent-error);
    }

    .card.research {
      --card-accent: var(--accent-warning);
    }

    .card.verdict {
      --card-accent: var(--accent-purple);
    }

    .card.winner {
      box-shadow:
        0 0 0 2px var(--accent-success),
        0 12px 40px rgba(45,138,95,0.25);
    }

    /* Agent Swarm panel */
    .agent-panel {
      position: absolute;
      top: 24px;
      left: 24px;
      width: 340px;
      max-height: calc(100vh - 120px);
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 16px;
      box-shadow:
        0 4px 16px rgba(0,0,0,0.1),
        0 12px 40px rgba(0,0,0,0.12);
      z-index: 200;
      display: none;
      flex-direction: column;
      overflow: hidden;
      animation: panelIn 0.35s var(--ease-out-expo);
    }

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

    .agent-panel-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 20px;
      border-bottom: 1px solid var(--border-subtle);
      font-family: var(--font-mono);
      font-size: 0.68rem;
      color: var(--text-tertiary);
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }

    .agent-log {
      flex: 1;
      overflow-y: auto;
      padding: 12px 20px 16px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .agent-log::-webkit-scrollbar { width: 5px; }
    .agent-log::-webkit-scrollbar-track { background: transparent; }
    .agent-log::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 3px; }

    .agent-entry {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      font-size: 0.82rem;
      line-height: 1.4;
      animation: panelIn 0.25s var(--ease-out-expo);
    }

    .agent-entry .agent-dot {
      flex-shrink: 0;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      margin-top: 5px;
      background: var(--text-tertiary);
    }

    .agent-entry.active .agent-dot {
      background: var(--accent-purple);
      animation: blink 0.8s infinite;
    }
    .agent-entry.done .agent-dot { background: var(--accent-success); }
    .agent-entry.fail .agent-dot { background: var(--accent-error); }

    .agent-entry .agent-role {
      font-family: var(--font-mono);
      font-size: 0.66rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-tertiary);
    }

    .agent-entry .agent-msg { color: var(--text-secondary); }

    .agent-actions {
      padding: 12px 20px;
      border-top: 1px solid var(--border-subtle);
      display: flex;
      gap: 8px;
    }

    .swarm-config .field { margin-bottom: 16px; }
    .swarm-config label.field-label {
      display: block;
      margin-bottom: 6px;
      font-family: var(--font-mono);
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--text-tertiary);
    }
    .swarm-config .config-row { display: flex; gap: 12px; }
    .swarm-config .config-row > div { flex: 1; }
    .swarm-config .checkbox-row {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      color: var(--text-secondary);
    }

    /* Resize handles */
    .resize-handle {
      position: absolute;
      background: transparent;
      z-index: 10;
    }

    .resize-handle-se {
      right: 0;
      bottom: 0;
      width: 20px;
      height: 20px;
      cursor: se-resize;
    }

    .resize-handle-se::after {
      content: '';
      position: absolute;
      right: 4px;
      bottom: 4px;
      width: 10px;
      height: 10px;
      border-right: 2px solid var(--text-tertiary);
      border-bottom: 2px solid var(--text-tertiary);
      opacity: 0;
      transition: opacity 0.2s ease;
    }

    .card:hover .resize-handle-se::after {
      opacity: 0.5;
    }

    .resize-handle-e {
      right: 0;
      top: 20px;
      bottom: 20px;
      width: 8px;
      cursor: e-resize;
    }

    .resize-handle-s {
      bottom: 0;
      left: 20px;
      right: 20px;
      height: 8px;
      cursor: s-resize;
    }

    .card.resizing {
      transition: none !important;
    }

    .card-header {
      padding: 16px 18px 12px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      border-bottom: 1px solid var(--card-border);
    }

    .card-tag {
      padding: 4px 10px;
      background: rgba(42,40,38,0.06);
      border-radius: 100px;
      font-family: var(--font-mono);
      font-size: 0.62rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--card-text-secondary);
    }

    .card-content {
      padding: 18px;
      font-family: var(--font-body);
      font-size: 0.92rem;
      line-height: 1.65;
      color: var(--card-text);
      white-space: pre-wrap;
    }

    .card-content .diff-added {
      background: rgba(45, 138, 95, 0.15);
      color: #1a5c3f;
      padding: 2px 4px;
      border-radius: 3px;
      font-weight: 500;
    }

    .card-content .diff-removed {
      background: rgba(197, 61, 61, 0.12);
      color: #8b2c2c;
      text-decoration: line-through;
      padding: 2px 4px;
      border-radius: 3px;
    }

    .card-header {
      position: relative;
    }

    /* Controlled Experiment (noise-baseline) modal */
    .experiment-modal {
      width: 540px;
      max-width: 94vw;
      max-height: 88vh;
      display: flex;
      flex-direction: column;
      text-align: left;
      transition: width 0.28s ease;
    }
    /* Widen only once the two-column results are on screen. */
    .experiment-modal.has-results {
      width: 920px;
    }

    .experiment-modal .modal-actions { margin-top: 16px; }

    /* One-knob isolation picker (intro state) */
    .exp-test-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 0 0 4px;
    }
    .exp-test-label {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-secondary);
    }
    .exp-test-row select {
      flex: 1;
      max-width: 260px;
    }

    .exp-verdict {
      border-radius: 12px;
      padding: 14px 16px;
      margin-bottom: 16px;
      font-size: 0.92rem;
      line-height: 1.45;
      border: 1px solid var(--border-subtle);
      background: var(--bg-elevated);
    }
    .exp-verdict.real { border-color: var(--accent-success); background: var(--accent-success-dim); }
    .exp-verdict.marginal { border-color: var(--accent-warning); background: var(--accent-warning-dim); }
    .exp-verdict.noise { border-color: var(--accent-error); background: var(--accent-error-dim); }
    .exp-verdict strong { font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.72rem; }
    .exp-verdict-line { margin-bottom: 6px; }
    .exp-verdict-line:last-child { margin-bottom: 0; }
    .exp-verdict-line .exp-verdict-track {
      font-family: var(--font-mono);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      font-size: 0.66rem;
      color: var(--text-tertiary);
      margin-right: 6px;
    }
    .exp-verdict-line.meaning .exp-verdict-track { color: var(--text-secondary); }
    .exp-verdict-line .exp-verdict-label { font-weight: 600; }
    .exp-verdict-note { margin-top: 6px; font-size: 0.78rem; color: var(--text-tertiary); font-style: italic; }

    .exp-columns {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      overflow: hidden;
      min-height: 0;
    }
    .exp-col {
      display: flex;
      flex-direction: column;
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      overflow: hidden;
      min-height: 0;
    }
    .exp-col-head {
      padding: 10px 14px;
      border-bottom: 1px solid var(--border-subtle);
    }
    .exp-col-head .exp-label {
      font-family: var(--font-mono);
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .exp-col.noise .exp-label { color: var(--accent-error); }
    .exp-col.signal .exp-label { color: var(--accent-success); }
    .exp-col-head .exp-metric { font-size: 0.82rem; color: var(--text-secondary); margin-top: 4px; }
    .exp-col-head .exp-metric-sem { font-size: 0.76rem; color: var(--text-tertiary); margin-top: 2px; }
    .exp-col-head .exp-sub { font-size: 0.72rem; color: var(--text-tertiary); margin-top: 2px; }
    .exp-diff {
      padding: 14px;
      overflow-y: auto;
      font-size: 0.88rem;
      line-height: 1.6;
      color: var(--text-secondary);
      white-space: pre-wrap;
    }
    .exp-diff .diff-added {
      background: rgba(45, 138, 95, 0.15);
      color: #1a5c3f;
      padding: 1px 3px;
      border-radius: 3px;
      font-weight: 500;
    }
    .exp-diff .diff-removed {
      background: rgba(197, 61, 61, 0.12);
      color: #8b2c2c;
      text-decoration: line-through;
      padding: 1px 3px;
      border-radius: 3px;
    }
    .exp-loading {
      display: flex;
      flex-direction: column;
      gap: 18px;
      padding: 24px 4px 8px;
    }
    .exp-progress-head {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .exp-progress-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-primary);
    }
    .exp-progress-sub {
      font-size: 0.8rem;
      color: var(--text-tertiary);
      margin-top: 2px;
      line-height: 1.4;
    }
    .exp-steps {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      padding-left: 38px;
      margin: 0;
    }
    .exp-step {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-mono);
      font-size: 0.78rem;
      color: var(--text-tertiary);
      transition: color 0.2s ease;
    }
    .exp-step-icon {
      flex-shrink: 0;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      border: 2px solid var(--border-medium);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.6rem;
      color: #fff;
    }
    .exp-step.pending .exp-step-icon { animation: blink 1.1s infinite; }
    .exp-step.done { color: var(--text-secondary); }
    .exp-step.done .exp-step-icon {
      background: var(--accent-success);
      border-color: var(--accent-success);
    }
    .exp-step.done .exp-step-icon::after { content: '✓'; }
    .btn.btn-experiment {
      margin-top: 8px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-medium);
      color: var(--text-secondary);
    }

    .card-actions {
      position: absolute;
      top: 14px;
      right: 10px;
      display: flex;
      gap: 4px;
      opacity: 0;
      transition: opacity 0.15s ease;
      z-index: 10;
      pointer-events: none;
    }

    .card:hover .card-actions {
      opacity: 1;
      pointer-events: auto;
    }

    .card-action-btn {
      width: 28px;
      height: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 6px;
      color: var(--text-tertiary);
      cursor: pointer !important;
      transition: all 0.15s ease;
    }

    .card-action-btn:hover {
      background: var(--bg-hover);
      color: var(--text-primary);
      border-color: var(--accent-warm);
    }

    .card-action-btn:active {
      transform: scale(0.95);
    }

    .card-action-btn.copied {
      background: var(--accent-success-dim);
      border-color: var(--accent-success);
      color: var(--accent-success);
    }

    .card-action-btn.delete-btn:hover {
      background: var(--accent-error-dim);
      border-color: var(--accent-error);
      color: var(--accent-error);
    }

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

    .view-toggle {
      position: absolute;
      top: 50%;
      right: 14px;
      transform: translateY(-50%);
      display: flex;
      background: rgba(42,40,38,0.08);
      border-radius: 5px;
      padding: 2px;
      gap: 1px;
      transition: right 0.15s ease;
    }

    .card:hover .view-toggle {
      right: 108px; /* clear the three hover action buttons */
    }

    .view-toggle button {
      padding: 4px 8px;
      border: none;
      border-radius: 3px;
      background: transparent;
      font-family: var(--font-mono);
      font-size: 0.58rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--card-text-secondary);
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .view-toggle button:hover {
      color: var(--card-text);
    }

    .view-toggle button.active {
      background: white;
      color: var(--card-text);
      box-shadow: 0 1px 2px rgba(0,0,0,0.1);
    }

    /* Connection arrows */
    .connection-arrow {
      position: absolute;
      pointer-events: none;
      z-index: 0;
    }

    .connection-arrow line {
      stroke: var(--accent-warm);
      stroke-width: 2;
      stroke-dasharray: 6 4;
      opacity: 0.6;
    }

    .connection-arrow polygon {
      fill: var(--accent-warm);
      opacity: 0.7;
    }

    .card-content::-webkit-scrollbar {
      width: 5px;
    }

    .card-content::-webkit-scrollbar-track {
      background: transparent;
    }

    .card-content::-webkit-scrollbar-thumb {
      background: var(--card-border);
      border-radius: 3px;
    }

    /* Analysis Panel (right side) */
    .analysis-panel {
      position: absolute;
      top: 24px;
      right: 24px;
      width: 360px;
      max-height: calc(100vh - 120px);
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 16px;
      box-shadow:
        0 4px 16px rgba(0,0,0,0.1),
        0 12px 40px rgba(0,0,0,0.12);
      z-index: 200;
      display: none;
      flex-direction: column;
      overflow: hidden;
      animation: panelIn 0.35s var(--ease-out-expo);
    }

    .analysis-panel.visible {
      display: flex;
    }

    .analysis-panel-content {
      padding: 20px;
      border-bottom: 1px solid var(--border-subtle);
    }

    .suggestions-section {
      flex: 1;
      overflow-y: auto;
      padding: 0 20px 20px;
    }

    .suggestions-section::-webkit-scrollbar {
      width: 5px;
    }

    .suggestions-section::-webkit-scrollbar-track {
      background: transparent;
    }

    .suggestions-section::-webkit-scrollbar-thumb {
      background: var(--border-medium);
      border-radius: 3px;
    }

    /* Critique Panel */
    .critique-panel {
      position: absolute;
      top: 24px;
      right: 24px;
      width: 340px;
      max-height: calc(100vh - 120px);
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 16px;
      box-shadow:
        0 4px 16px rgba(0,0,0,0.1),
        0 12px 40px rgba(0,0,0,0.12);
      z-index: 200;
      display: none;
      flex-direction: column;
      overflow: hidden;
      animation: panelIn 0.35s var(--ease-out-expo);
    }

    .critique-panel.visible {
      display: flex;
    }

    @keyframes panelIn {
      from {
        opacity: 0;
        transform: translateX(20px) scale(0.96);
      }
      to {
        opacity: 1;
        transform: translateX(0) scale(1);
      }
    }

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

    .critique-header h2 {
      font-family: var(--font-display);
      font-size: 1.1rem;
      font-weight: 500;
      color: var(--text-primary);
    }

    .critique-close {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      border-radius: 8px;
      color: var(--text-tertiary);
      font-size: 1.3rem;
      cursor: pointer;
      transition: all 0.15s ease;
    }

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

    .critique-close:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 2px;
    }

    .critique-content {
      flex: 1;
      overflow-y: auto;
      padding: 20px;
    }

    .critique-content::-webkit-scrollbar {
      width: 5px;
    }

    .critique-content::-webkit-scrollbar-track {
      background: transparent;
    }

    .critique-content::-webkit-scrollbar-thumb {
      background: var(--border-medium);
      border-radius: 3px;
    }

    .verdict {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 16px;
      border-radius: 12px;
      margin-bottom: 20px;
    }

    .verdict.good {
      background: var(--accent-success-dim);
    }

    .verdict.good .verdict-icon {
      color: var(--accent-success);
    }

    .verdict.needs-work {
      background: var(--accent-warning-dim);
    }

    .verdict.needs-work .verdict-icon {
      color: var(--accent-warning);
    }

    .verdict.poor {
      background: var(--accent-error-dim);
    }

    .verdict.poor .verdict-icon {
      color: var(--accent-error);
    }

    .verdict-icon {
      font-size: 1.5rem;
      line-height: 1;
    }

    .verdict-text {
      font-family: var(--font-body);
      font-size: 0.92rem;
      line-height: 1.5;
      color: var(--text-primary);
    }

    .critique-section {
      margin-bottom: 20px;
    }

    .critique-section h3 {
      font-family: var(--font-mono);
      font-size: 0.62rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--text-tertiary);
      margin-bottom: 12px;
    }

    .critique-list {
      list-style: none;
    }

    .critique-list li {
      display: flex;
      gap: 10px;
      padding: 12px 14px;
      background: var(--bg-elevated);
      border-radius: 8px;
      margin-bottom: 8px;
      font-size: 0.88rem;
      line-height: 1.5;
      color: var(--text-secondary);
      transition: all 0.15s ease;
    }

    .critique-list li:hover {
      background: var(--bg-hover);
      color: var(--text-primary);
    }

    .critique-list .icon {
      flex-shrink: 0;
      width: 18px;
      text-align: center;
    }

    .critique-list .icon.plus { color: var(--accent-success); }
    .critique-list .icon.minus { color: var(--accent-error); }
    .critique-list .icon.arrow { color: var(--accent-warm); }

    .critique-loading {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 16px;
      padding: 48px 24px;
      color: var(--text-tertiary);
    }

    .critique-loading .spinner {
      width: 32px;
      height: 32px;
      border: 2px solid var(--border-subtle);
      border-top-color: var(--accent-warm);
      border-radius: 50%;
      animation: spin 0.8s linear infinite;
    }

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

    .critique-actions {
      padding: 16px 20px;
      border-top: 1px solid var(--border-subtle);
      display: flex;
      gap: 10px;
    }

    .critique-actions .btn {
      flex: 1;
      padding: 12px 16px;
      font-size: 0.88rem;
    }

    /* Zoom Controls */
    .zoom-controls {
      position: absolute;
      bottom: 24px;
      right: 24px;
      display: flex;
      align-items: center;
      gap: 2px;
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 10px;
      padding: 4px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
      z-index: 50;
    }

    .zoom-controls button {
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      border-radius: 6px;
      color: var(--text-secondary);
      font-size: 1.1rem;
      cursor: pointer;
      transition: all 0.15s ease;
    }

    .zoom-controls button:hover {
      background: var(--bg-hover);
      color: var(--text-primary);
    }

    .zoom-controls button:focus-visible {
      outline: 2px solid var(--accent-warm);
      outline-offset: 1px;
    }

    .zoom-level {
      padding: 0 12px;
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-tertiary);
      min-width: 48px;
      text-align: center;
    }

    /* Comparison Panel */
    .compare-panel {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--bg-surface);
      border-top: 1px solid var(--border-medium);
      box-shadow: 0 -4px 24px rgba(0,0,0,0.12);
      z-index: 300;
      display: none;
      flex-direction: column;
      max-height: 45vh;
      animation: slideUp 0.3s var(--ease-out-expo);
    }

    .compare-panel.visible {
      display: flex;
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .compare-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 24px;
      border-bottom: 1px solid var(--border-subtle);
      flex-shrink: 0;
    }

    .compare-header-left {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .compare-header h2 {
      font-family: var(--font-display);
      font-size: 1rem;
      font-weight: 500;
      color: var(--text-primary);
    }

    .compare-header .count-badge {
      padding: 4px 10px;
      background: var(--accent-purple-dim);
      color: var(--accent-purple);
      border-radius: 100px;
      font-family: var(--font-mono);
      font-size: 0.7rem;
      font-weight: 500;
    }

    .compare-header-right {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .diff-toggle {
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-mono);
      font-size: 0.7rem;
      color: var(--text-secondary);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .diff-toggle input[type="checkbox"] {
      width: 16px;
      height: 16px;
      accent-color: var(--accent-purple);
      cursor: pointer;
    }

    .compare-close {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      border: none;
      border-radius: 8px;
      color: var(--text-tertiary);
      font-size: 1.3rem;
      cursor: pointer;
      transition: all 0.15s ease;
    }

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

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

    .compare-column {
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
      border-right: 1px solid var(--border-subtle);
    }

    .compare-column:last-child {
      border-right: none;
    }

    .compare-column-header {
      padding: 12px 16px;
      background: var(--bg-elevated);
      border-bottom: 1px solid var(--border-subtle);
      flex-shrink: 0;
    }

    .compare-column-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-bottom: 8px;
    }

    .compare-column-tag {
      padding: 3px 8px;
      background: rgba(42,40,38,0.08);
      border-radius: 100px;
      font-family: var(--font-mono);
      font-size: 0.6rem;
      font-weight: 500;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--text-secondary);
    }

    .compare-column-tag.source {
      background: var(--accent-success-dim);
      color: var(--accent-success);
    }

    .compare-column-meta {
      font-family: var(--font-mono);
      font-size: 0.65rem;
      color: var(--text-tertiary);
    }

    .compare-column-content {
      flex: 1;
      overflow-y: auto;
      padding: 16px;
      font-family: var(--font-body);
      font-size: 0.88rem;
      line-height: 1.65;
      color: var(--text-primary);
      white-space: pre-wrap;
    }

    .compare-column-content::-webkit-scrollbar {
      width: 5px;
    }

    .compare-column-content::-webkit-scrollbar-track {
      background: transparent;
    }

    .compare-column-content::-webkit-scrollbar-thumb {
      background: var(--border-medium);
      border-radius: 3px;
    }

    .compare-column-content .diff-added {
      background: rgba(45, 138, 95, 0.15);
      color: #1a5c3f;
      padding: 2px 4px;
      border-radius: 3px;
      font-weight: 500;
    }

    .compare-column-content .diff-removed {
      background: rgba(197, 61, 61, 0.12);
      color: #8b2c2c;
      text-decoration: line-through;
      padding: 2px 4px;
      border-radius: 3px;
    }

    /* Canvas Hint */
    .canvas-hint {
      position: absolute;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      padding: 10px 20px;
      background: var(--bg-surface);
      border: 1px solid var(--border-medium);
      border-radius: 100px;
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-secondary);
      z-index: 50;
      opacity: 0;
      transition: opacity 0.3s ease;
      pointer-events: none;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
    }

    .canvas-hint.visible {
      opacity: 1;
    }

    /* Empty State */
    .empty-state {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      text-align: center;
      pointer-events: none;
      opacity: 0.5;
    }

    .empty-state h2 {
      font-family: var(--font-display);
      font-size: 1.8rem;
      font-weight: 300;
      color: var(--text-tertiary);
      margin-bottom: 12px;
    }

    .empty-state p {
      font-family: var(--font-mono);
      font-size: 0.75rem;
      color: var(--text-tertiary);
      text-transform: uppercase;
      letter-spacing: 0.1em;
    }

    /* ===================================================================
       Toast notifications — bottom-center of the canvas area, above the
       compare panel (z-index 300).
       =================================================================== */
    .toast-container {
      position: absolute;
      left: 50%;
      bottom: 28px;
      transform: translateX(-50%);
      z-index: 400;
      display: flex;
      flex-direction: column-reverse;
      align-items: center;
      gap: 10px;
      pointer-events: none;
      max-width: min(480px, calc(100% - 48px));
    }

    .toast {
      pointer-events: auto;
      display: flex;
      align-items: center;
      gap: 12px;
      background: var(--text-primary);
      color: var(--bg-surface);
      border-left: 3px solid var(--accent-warm);
      border-radius: 10px;
      padding: 12px 14px 12px 16px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.24);
      font-family: var(--font-body);
      font-size: 0.85rem;
      line-height: 1.4;
      opacity: 0;
      transform: translateY(12px) scale(0.98);
      transition: opacity 0.25s var(--ease-out-expo), transform 0.25s var(--ease-out-expo);
    }

    .toast.toast-error {
      border-left-color: var(--accent-error);
    }

    .toast.toast-visible {
      opacity: 1;
      transform: translateY(0) scale(1);
    }

    .toast.toast-leaving {
      opacity: 0;
      transform: translateY(8px) scale(0.98);
    }

    .toast-message {
      flex: 1;
      min-width: 0;
    }

    .toast-action {
      flex-shrink: 0;
      background: transparent;
      border: 1px solid rgba(255,255,255,0.35);
      color: inherit;
      font-family: var(--font-mono);
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      transition: background 0.15s ease, border-color 0.15s ease;
    }

    .toast-action:hover {
      background: rgba(255,255,255,0.14);
      border-color: rgba(255,255,255,0.55);
    }

    .toast-close {
      flex-shrink: 0;
      background: transparent;
      border: none;
      color: inherit;
      opacity: 0.6;
      font-size: 1.1rem;
      line-height: 1;
      cursor: pointer;
      padding: 2px 4px;
    }

    .toast-close:hover {
      opacity: 1;
    }

    /* API key modal — "remember on this device" checkbox */
    .remember-key-row {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      color: var(--text-secondary);
      cursor: pointer;
    }

    .remember-key-row input[type="checkbox"] {
      width: 15px;
      height: 15px;
      accent-color: var(--accent-warm);
      cursor: pointer;
    }

    .modal .remember-key-hint {
      margin-top: 6px;
      margin-bottom: 0;
      font-family: var(--font-mono);
      font-size: 0.68rem;
      color: var(--text-tertiary);
      line-height: 1.5;
    }

    /* ===================================================================
       Sensitivity Map — sidebar button, modal, and the DOM/CSS bar chart.
       Appended so parallel edits elsewhere don't conflict.
       ===================================================================== */
    .btn.btn-sensitivity {
      margin-top: 8px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-medium);
      color: var(--text-secondary);
    }

    .sensitivity-modal {
      width: 560px;
      max-width: 94vw;
      max-height: 88vh;
      display: flex;
      flex-direction: column;
      text-align: left;
      transition: width 0.28s ease;
    }
    /* Widen once the chart is on screen so knob rows have room. */
    .sensitivity-modal.has-results { width: 860px; }
    .sensitivity-modal .modal-actions { margin-top: 16px; }

    .sens-stored-note {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-tertiary);
      margin: -8px 0 14px;
    }

    .sens-result {
      flex: 1;
      min-height: 0;
      flex-direction: column;
      display: flex;
      overflow-y: auto;
    }
    .sens-summary {
      border-radius: 12px;
      padding: 14px 16px;
      margin-bottom: 16px;
      font-size: 0.95rem;
      line-height: 1.45;
      border: 1px solid var(--accent-warm);
      background: var(--accent-warm-dim);
      color: var(--text-primary);
    }

    /* --- the chart --- */
    .sens-chart {
      position: relative;
      --sens-label-w: 190px;
    }
    /* Chart-wide noise reference: a shaded band out to the noise max and a line
       at the noise median, spanning the plot column behind every row's bar. */
    .sens-noise-overlay {
      position: absolute;
      left: var(--sens-label-w);
      right: 92px;
      top: 34px;
      bottom: 8px;
      pointer-events: none;
      z-index: 0;
    }
    .sens-noise-band {
      position: absolute;
      top: 0;
      bottom: 0;
      left: 0;
      background: rgba(122, 117, 114, 0.12);
      border-right: 1px dashed var(--border-medium);
    }
    .sens-noise-tag {
      position: absolute;
      top: -2px;
      right: 4px;
      font-family: var(--font-mono);
      font-size: 0.6rem;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: var(--text-tertiary);
    }
    .sens-noise-line {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 0;
      border-left: 2px solid var(--accent-error);
      opacity: 0.55;
    }

    .sens-knob-group {
      position: relative;
      z-index: 1;
      margin-bottom: 12px;
    }
    .sens-knob-head {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 4px;
    }
    .sens-knob-name {
      font-family: var(--font-mono);
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-secondary);
    }
    .sens-knob-group.sens-strong .sens-knob-name { color: var(--accent-warm); font-weight: 700; }
    .sens-badge {
      font-family: var(--font-mono);
      font-size: 0.58rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #fff;
      background: var(--accent-warm);
      border-radius: 5px;
      padding: 1px 6px;
    }

    .sens-row {
      display: grid;
      grid-template-columns: var(--sens-label-w) 1fr 84px;
      align-items: center;
      gap: 8px;
      padding: 3px 0;
    }
    .sens-row-label {
      font-size: 0.8rem;
      color: var(--text-secondary);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .sens-track {
      position: relative;
      height: 16px;
      background: var(--bg-elevated);
      border: 1px solid var(--border-subtle);
      border-radius: 5px;
      overflow: visible;
    }
    .sens-bar {
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      min-width: 2px;
      background: var(--accent-warm);
      border-radius: 5px 0 0 5px;
    }
    .sens-bar.sens-bar-surface-only { background: var(--text-tertiary); }
    .sens-surf-tick {
      position: absolute;
      top: -2px;
      bottom: -2px;
      width: 0;
      border-left: 2px solid var(--accent-purple);
    }
    .sens-row-value {
      font-family: var(--font-mono);
      font-size: 0.66rem;
      color: var(--text-tertiary);
      text-align: right;
      white-space: nowrap;
    }
    .sens-chart-foot {
      margin-top: 10px;
      font-family: var(--font-mono);
      font-size: 0.68rem;
      color: var(--text-tertiary);
      line-height: 1.5;
    }

    /* --- progress (mirrors the experiment's) --- */
    .sens-loading {
      display: flex;
      flex-direction: column;
      gap: 18px;
      padding: 24px 4px 8px;
    }
    .sens-progress-head { display: flex; align-items: center; gap: 14px; }
    .sens-progress-title { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); }
    .sens-progress-sub { font-size: 0.8rem; color: var(--text-tertiary); margin-top: 2px; line-height: 1.4; }
    .sens-steps {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      padding-left: 38px;
      margin: 0;
    }
    .sens-step {
      display: flex;
      align-items: center;
      gap: 10px;
      font-family: var(--font-mono);
      font-size: 0.78rem;
      color: var(--text-tertiary);
      transition: color 0.2s ease;
    }
    .sens-step-icon {
      flex-shrink: 0;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      border: 2px solid var(--border-medium);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.6rem;
      color: #fff;
    }
    .sens-step.pending .sens-step-icon { animation: blink 1.1s infinite; }
    .sens-step.done { color: var(--text-secondary); }
    .sens-step.done .sens-step-icon {
      background: var(--accent-success);
      border-color: var(--accent-success);
    }
    .sens-step.done .sens-step-icon::after { content: '✓'; }
    /* ===================================================================
       Ablation Lab — config modal cost line + results (win bars, verdict,
       per-pair reasons). Appended; touches nothing above.
       =================================================================== */
    .abl-cost {
      margin: 4px 0 0;
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-tertiary);
      line-height: 1.5;
    }

    .abl-results {
      margin-top: 18px;
      padding-top: 16px;
      border-top: 1px solid var(--border-subtle);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .abl-bars {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .abl-bar-row {
      display: grid;
      grid-template-columns: 120px 1fr auto;
      align-items: center;
      gap: 10px;
    }
    .abl-bar-label {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-secondary);
      text-align: right;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .abl-bar-track {
      position: relative;
      height: 16px;
      background: var(--bg-hover);
      border: 1px solid var(--border-subtle);
      border-radius: 8px;
      overflow: hidden;
    }
    .abl-bar-fill {
      height: 100%;
      background: var(--border-medium);
      border-radius: 8px 0 0 8px;
      transition: width 0.35s ease;
      min-width: 2px;
    }
    .abl-bar-fill.win {
      background: var(--accent-success);
    }
    .abl-bar-count {
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-secondary);
      min-width: 46px;
      text-align: right;
    }

    .abl-verdict-line {
      font-size: 0.82rem;
      line-height: 1.55;
      color: var(--text-secondary);
      padding: 10px 12px;
      border-radius: 8px;
      border-left: 3px solid var(--border-medium);
      background: var(--bg-elevated);
    }
    .abl-verdict-line strong { color: var(--text-primary); }
    .abl-verdict-line.strong {
      border-left-color: var(--accent-success);
      background: var(--accent-success-dim);
    }
    .abl-verdict-line.moderate {
      border-left-color: var(--accent-warm);
      background: var(--accent-warm-dim);
    }
    .abl-verdict-line.suggestive {
      border-left-color: var(--accent-warning);
      background: var(--accent-warning-dim);
    }
    .abl-verdict-line.tie {
      border-left-color: var(--text-tertiary);
    }

    .abl-pairs {
      font-size: 0.78rem;
      color: var(--text-secondary);
    }
    .abl-pairs > summary {
      cursor: pointer;
      font-family: var(--font-mono);
      font-size: 0.72rem;
      color: var(--text-tertiary);
      padding: 4px 0;
      user-select: none;
    }
    .abl-pair {
      padding: 8px 0;
      border-top: 1px solid var(--border-subtle);
    }
    .abl-pair-head {
      font-family: var(--font-mono);
      font-size: 0.7rem;
      color: var(--text-primary);
      margin-bottom: 3px;
    }
    .abl-pair-reason {
      font-size: 0.78rem;
      line-height: 1.5;
      color: var(--text-secondary);
    }