/* ============================================================
   STAT - Spatial Transcriptomics Analysis Tool
   Modern minimal design: white panels, subtle borders, clean type
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #ffffff;
  --bg-subtle: #f8f9fa;
  --bg-muted: #f1f3f5;
  --border: #e1e4e8;
  --border-light: #eef0f2;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --danger: #dc2626;
  --danger-light: #fef2f2;
  --success: #16a34a;
  --success-light: #f0fdf4;
  --warning: #d97706;
  --warning-light: #fffbeb;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
  --transition: 150ms ease;
}

html, body {
  height: 100%;
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg-subtle);
  overflow: hidden;
}

.hidden { display: none !important; }

/* --- Init Overlay --- */
#init-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  z-index: 1000;
}

.init-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  width: 420px;
  max-width: 90vw;
  box-shadow: var(--shadow-lg);
}

.init-logo {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 4px;
}

.init-subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 28px;
}

/* --- Forms --- */
.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.form-group input, .form-group select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition);
}

.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group .optional {
  font-weight: 400;
  color: var(--text-muted);
  text-transform: none;
}

.form-hint {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 3px;
  line-height: 1.4;
}
.form-hint code {
  background: var(--bg-muted);
  padding: 0 3px;
  border-radius: 2px;
  font-size: 10.5px;
  font-family: var(--font-mono);
}

.form-hint-inline {
  font-weight: 400;
  font-size: 10px;
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
}

.form-group select {
  appearance: auto;
  cursor: pointer;
}

.form-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
}

/* --- LLM Config --- */
.llm-config {
  margin: 16px 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
}

.llm-config summary {
  padding: 10px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.llm-config summary:hover {
  color: var(--text);
}

.llm-config-body {
  padding: 0 12px 12px;
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 10px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--transition);
}

.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  padding: 6px 12px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-secondary:hover { background: var(--bg-subtle); }

.btn-header {
  padding: 4px 10px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-header:hover { background: var(--bg-muted); color: var(--text); }
.btn-logout { color: var(--danger); border-color: var(--danger); opacity: 0.7; }
.btn-logout:hover { background: var(--danger); color: #fff; opacity: 1; }

.btn-tool {
  padding: 4px 10px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  min-width: 32px;
  text-align: center;
}

.btn-tool:hover { background: var(--bg-muted); }
.btn-tool.active { background: var(--accent); color: white; border-color: var(--accent); }

.btn-tiny {
  padding: 2px 6px;
  background: none;
  color: var(--text-muted);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-tiny:hover { color: var(--text); border-color: var(--border); }

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

.btn-danger:hover { background: #b91c1c; }

/* --- Error/Loading Messages --- */
.error-msg {
  margin-top: 10px;
  padding: 8px 10px;
  background: var(--danger-light);
  color: var(--danger);
  border-radius: var(--radius);
  font-size: 12px;
}

.loading-msg {
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 12px;
  text-align: center;
}

.small-info {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Header --- */
#app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  padding: 0 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

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

.header-logo {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.session-info {
  font-size: 12px;
  color: var(--text-secondary);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* --- Main Layout (Three Columns + resize handles) --- */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 3px 260px 3px 600px;
  height: calc(100vh - 44px);
}

/* --- Resize Handles --- */
.resize-handle {
  width: 3px;
  cursor: col-resize;
  background: var(--border-light);
  position: relative;
  z-index: 20;
  transition: background 0.15s;
}

.resize-handle:hover,
.resize-handle.active {
  background: var(--border);
}

/* --- Spatial Viewer (Left) --- */
.spatial-viewer {
  display: flex;
  flex-direction: column;
  background: var(--bg-muted);
  overflow: hidden;
  position: relative; /* anchor for skill panel */
}

.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  cursor: grab;
}

.canvas-container.panning { cursor: grabbing; }
.canvas-container.roi-drawing { cursor: crosshair; }

#spatial-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* --- 3D Viewer --- */
.viewer-3d {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #f0f2f5 0%, #e2e6ec 100%);
  overflow: hidden;
  cursor: grab;
}
.viewer-3d.orbiting { cursor: grabbing; }

.scene-3d {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  pointer-events: none;
}

.slice-plane {
  position: absolute;
  transform-style: preserve-3d;
  pointer-events: auto;
  cursor: pointer;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
  transition: box-shadow 0.15s;
}
.slice-plane:hover {
  box-shadow: 0 2px 12px rgba(0,0,0,0.2), 0 0 0 2px rgba(100,149,237,0.6);
}
.slice-plane.active-slice {
  box-shadow: 0 2px 12px rgba(0,0,0,0.2), 0 0 0 3px cornflowerblue;
}

.slice-plane canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.slice-label {
  position: absolute;
  bottom: 0;
  right: 0;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  pointer-events: none;
  border-top-left-radius: 4px;
}

.viewer-3d-controls {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(8px);
  padding: 5px 14px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 2;
  box-shadow: 0 1px 6px rgba(0,0,0,0.12);
}
.viewer-3d-controls .toolbar-slider {
  width: 100px;
}

.btn-tiny.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.canvas-spinner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.8);
  gap: 8px;
  font-size: 12px;
  color: var(--text-secondary);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

.viewer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 34px;
  padding: 0 8px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.toolbar-left, .toolbar-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-info {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 0 4px;
}

.toolbar-center {
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-label {
  font-size: 10px;
  color: var(--text-muted);
  user-select: none;
}

.toolbar-number {
  width: 48px;
  padding: 1px 4px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--bg);
  color: var(--text);
  text-align: center;
}
.toolbar-number:focus {
  outline: none;
  border-color: var(--accent);
}

.toolbar-slider {
  width: 60px;
  height: 3px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.toolbar-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  cursor: pointer;
}

.toolbar-slider::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  cursor: pointer;
  border: none;
}

.toolbar-sep {
  width: 1px;
  height: 14px;
  background: var(--border);
  margin: 0 2px;
}

.toolbar-checkbox {
  display: flex;
  align-items: center;
  gap: 3px;
  cursor: pointer;
}

.toolbar-checkbox input {
  margin: 0;
  accent-color: var(--accent);
}

/* --- Controls Panel (Center) --- */
.controls-panel {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  overflow-y: auto;
  overflow-x: hidden;
}

.control-group {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-light);
}

.control-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

/* --- Slice Tabs --- */
.slice-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.slice-tab {
  padding: 4px 10px;
  background: var(--bg-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}

.slice-tab:hover { background: var(--bg-muted); color: var(--text); }
.slice-tab.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* --- Segmented Control --- */
.segmented-control {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.seg-btn {
  flex: 1;
  padding: 5px 12px;
  background: var(--bg);
  color: var(--text-secondary);
  border: none;
  border-right: 1px solid var(--border);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
}

.seg-btn:last-child { border-right: none; }
.seg-btn:hover { background: var(--bg-subtle); }
.seg-btn.active {
  background: var(--accent);
  color: white;
}

/* --- Radio Group --- */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.radio-option {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 0;
  font-size: 12px;
  cursor: pointer;
}

.radio-option input[type="radio"] {
  margin: 0;
  accent-color: var(--accent);
}

.radio-option input:disabled + span {
  color: var(--text-muted);
}

/* --- Search / Autocomplete --- */
.search-wrapper {
  position: relative;
}

.search-wrapper input {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
}

.search-wrapper input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.autocomplete-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-height: 200px;
  overflow-y: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  box-shadow: var(--shadow);
  z-index: 100;
}

.autocomplete-item {
  padding: 5px 8px;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--transition);
}

.autocomplete-item:hover, .autocomplete-item.active {
  background: var(--accent-light);
  color: var(--accent);
}

/* --- Checkbox List (Celltypes) --- */
/* --- Proportion Select --- */
.proportion-select {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.proportion-select:focus {
  outline: none;
  border-color: var(--accent);
}

/* --- Colorbar & Vmax --- */
.colorbar-display {
  margin-bottom: 6px;
}

.colorbar-bar {
  height: 12px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.colorbar-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 2px;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.vmax-control {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}

.vmax-control label {
  flex-shrink: 0;
  font-size: 11px;
}

.vmax-slider {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.vmax-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

.vmax-slider::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

.checkbox-list {
  max-height: 200px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 40px;
}

.ct-resize-handle {
  height: 6px;
  cursor: row-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.ct-resize-handle::after {
  content: '';
  width: 30px;
  height: 2px;
  background: var(--border);
  border-radius: 1px;
  transition: background 0.15s;
}

.ct-resize-handle:hover::after,
.ct-resize-handle.active::after {
  background: var(--text-muted);
}

.ct-checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  font-size: 12px;
  cursor: pointer;
}

.ct-checkbox input[type="checkbox"] {
  margin: 0;
  accent-color: var(--accent);
}

.ct-swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  border: 1px solid rgba(0,0,0,0.1);
  flex-shrink: 0;
}

/* --- ROI --- */
.roi-toolbar {
  display: flex;
  gap: 4px;
  margin-bottom: 8px;
}

.roi-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.roi-item {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  padding: 5px 8px;
  background: var(--bg-subtle);
  border-radius: 4px;
  font-size: 12px;
  border: 1px solid transparent;
  transition: all var(--transition);
}

.roi-item-main {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

.roi-item-name {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.roi-item-slice {
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-muted);
  padding: 0 4px;
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
}

.roi-item-detail {
  width: 100%;
  font-size: 11px;
  color: var(--text-muted);
  padding-top: 2px;
}

/* Inactive ROIs (different slice) */
.roi-item.roi-inactive {
  opacity: 0.45;
}

.roi-item.roi-inactive .roi-item-name {
  font-weight: 400;
}

.roi-item-actions {
  display: none;
  gap: 2px;
  margin-left: auto;
  flex-shrink: 0;
}

.roi-item:hover .roi-item-actions {
  display: flex;
}

.roi-item.highlighted {
  background: var(--accent-light);
  border-color: var(--accent);
}

.roi-action-btn {
  width: 20px;
  height: 20px;
  padding: 0;
  background: none;
  border: 1px solid var(--border-light);
  border-radius: 3px;
  font-size: 12px;
  line-height: 18px;
  text-align: center;
  cursor: pointer;
  color: var(--text-muted);
  font-family: var(--font);
  transition: all var(--transition);
}

.roi-action-btn:hover {
  background: var(--bg-muted);
  color: var(--text);
}

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

/* --- Chat Panel (Right) --- */
.chat-panel {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-welcome {
  text-align: center;
  padding: 24px 16px;
  color: var(--text-secondary);
}

.chat-welcome p:first-child {
  font-size: 14px;
  margin-bottom: 8px;
}

/* --- Chat Messages --- */
.chat-msg {
  max-width: 95%;
}

.chat-msg.user {
  align-self: flex-end;
}

.chat-msg.user .chat-msg-body {
  background: var(--accent);
  color: white;
  border-radius: var(--radius) var(--radius) 2px var(--radius);
  padding: 8px 12px;
  font-size: 13px;
}

.chat-msg.assistant {
  align-self: flex-start;
  width: 100%;
}

.chat-msg.assistant .chat-msg-body {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 2px var(--radius) var(--radius) var(--radius);
  padding: 10px 12px;
  font-size: 13px;
}

/* --- Chat: Plan Card --- */
.plan-card {
  margin: 6px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.plan-card summary {
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-subtle);
  cursor: pointer;
}

.plan-steps {
  padding: 6px 10px;
  list-style: none;
}

.plan-step {
  padding: 3px 0;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.plan-step-num {
  width: 18px;
  height: 18px;
  background: var(--bg-muted);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
}

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

.plan-step.done .plan-step-num {
  background: var(--success);
  color: white;
}

/* --- Chat: Code Block --- */
.chat-code-block {
  margin: 6px 0;
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
}

.chat-code-block pre {
  padding: 10px 12px;
  overflow-x: auto;
  white-space: pre;
}

/* --- Chat: Markdown Headings --- */
.chat-heading { margin: 8px 0 4px; font-weight: 600; }
h1.chat-heading { font-size: 1.3em; }
h2.chat-heading { font-size: 1.15em; }
h3.chat-heading { font-size: 1.05em; }
h4.chat-heading, h5.chat-heading, h6.chat-heading { font-size: 0.95em; }

/* --- Chat: Blockquote --- */
.chat-blockquote {
  margin: 6px 0;
  padding: 4px 10px;
  border-left: 3px solid var(--border);
  color: var(--text-secondary);
  font-style: italic;
}

/* --- Chat: Horizontal Rule --- */
.chat-hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 8px 0;
}

/* --- Chat: Execution Output --- */
.exec-details {
  margin: 6px 0;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  overflow: hidden;
}
.exec-details summary {
  padding: 4px 8px;
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
  background: var(--bg-secondary);
  user-select: none;
}
.exec-details summary:hover {
  color: var(--text);
}
.exec-output {
  padding: 6px 8px;
  background: #1e1e2e;
  color: #a6adc8;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  max-height: 300px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.exec-output .stderr {
  color: #f38ba8;
}

/* --- Chat: Plots --- */
.chat-plot {
  margin: 6px 0;
  text-align: center;
}

.chat-plot img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* --- Chat: Tables --- */
.chat-table {
  border-collapse: collapse;
  margin: 6px 0;
  font-size: 12px;
  width: 100%;
}
.chat-table th, .chat-table td {
  border: 1px solid var(--border);
  padding: 4px 8px;
  text-align: left;
}
.chat-table th {
  background: var(--bg-secondary);
  font-weight: 600;
}
.chat-table tr:nth-child(even) td {
  background: var(--bg-secondary);
}

/* --- Chat: Alert Cards --- */
.alert-card {
  margin: 6px 0;
  padding: 8px 10px;
  border-radius: var(--radius);
  font-size: 12px;
}

.alert-card.warning {
  background: var(--warning-light);
  color: var(--warning);
  border: 1px solid #fde68a;
}

.alert-card.advice {
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid #bfdbfe;
}

.alert-card.error {
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid #fecaca;
}

.alert-card.success {
  background: var(--success-light);
  color: var(--success);
  border: 1px solid #bbf7d0;
}

/* --- Chat: Clarification / Skill Selection --- */
.clarification-ui {
  margin: 6px 0;
  padding: 8px 10px;
  background: var(--accent-light);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius);
}

.clarification-ui .question {
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
}

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

.clarification-option-btn {
  padding: 6px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition);
}

.clarification-option-btn:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.clarification-option-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.clarification-option-btn:disabled {
  opacity: 0.5;
  cursor: default;
}

.clarification-option-btn:disabled:hover {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border);
}

.clarification-option-btn:disabled.active:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* --- Chat: Pipeline Log --- */
.pipeline-log {
  margin: 4px 0;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  font-size: 11px;
}

.pipeline-log summary {
  padding: 4px 8px;
  color: var(--text-muted);
  cursor: pointer;
}

.pipeline-log-content {
  padding: 4px 8px;
  max-height: 120px;
  overflow-y: auto;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  white-space: pre-wrap;
}

/* --- Chat Input --- */
.chat-input-area {
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#chat-input {
  flex: 1;
  resize: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  font-size: 13px;
  font-family: var(--font);
  line-height: 1.4;
  max-height: 120px;
  color: var(--text);
  background: var(--bg);
}

#chat-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.chat-buttons {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chat-buttons .btn-primary {
  width: auto;
  padding: 8px 16px;
}

.chat-buttons .btn-danger {
  padding: 8px 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 12px;
  font-family: var(--font);
  cursor: pointer;
}

/* --- Markdown in chat --- */
.chat-msg-body strong { font-weight: 600; }
.chat-msg-body em { font-style: italic; }
.chat-msg-body code {
  background: rgba(0,0,0,0.06);
  padding: 1px 4px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
}
.chat-msg-body ul, .chat-msg-body ol {
  margin: 4px 0;
  padding-left: 18px;
}
.chat-msg-body li { margin: 2px 0; }
.chat-msg-body a {
  color: var(--accent);
  text-decoration: none;
}
.chat-msg-body a:hover { text-decoration: underline; }
.chat-msg-body p { margin: 4px 0; }

/* --- Scrollbar Styling --- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* --- Legend Overlay (rendered on canvas via CSS overlay) --- */
.legend-overlay {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255,255,255,0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
  max-height: 250px;
  overflow-y: auto;
  font-size: 11px;
  z-index: 10;
  box-shadow: var(--shadow-sm);
  pointer-events: none;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 1px 0;
}

.legend-swatch {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* --- Expression Gradient Legend --- */
.gradient-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}

.gradient-bar {
  width: 80px;
  height: 10px;
  border-radius: 2px;
  border: 1px solid rgba(0,0,0,0.1);
}

.gradient-label {
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
  line-height: 1;
}
.btn-icon:hover {
  background: var(--bg-muted);
  color: var(--text);
}

/* ===== Skill Panel ===== */

/* The panel container: holds inner content + tab handle.
   Slides left/right; tab sticks out on the right edge always. */
.skill-panel {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  /* Width = panel content (300px) + tab handle (22px) */
  width: 322px;
  z-index: 11;
  display: flex;
  /* Start with only tab visible: shift left by content width */
  transform: translateX(-300px);
  transition: transform 0.25s ease;
  pointer-events: none; /* let clicks pass through when collapsed */
}
.skill-panel.open {
  transform: translateX(0);
}
/* Re-enable pointer events on the actual interactive children */
.skill-panel-inner,
.skill-panel-tab {
  pointer-events: auto;
}

.skill-panel-inner {
  width: 300px;
  flex-shrink: 0;
  background: var(--bg);
  border-right: 1px solid var(--border);
  box-shadow: 4px 0 16px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Tab handle: right edge of panel, always visible */
.skill-panel-tab {
  width: 22px;
  flex-shrink: 0;
  align-self: center; /* vertically center within the panel height */
  height: 72px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: none;
  border-radius: 0 6px 6px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition), width var(--transition);
  box-shadow: 2px 0 6px rgba(0,0,0,0.06);
  /* Position vertically centered */
  margin-top: auto;
  margin-bottom: auto;
}
.skill-panel-tab:hover {
  background: var(--bg-muted);
  width: 26px;
}
.skill-panel-tab .tab-icon {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1;
}
.skill-panel.open .skill-panel-tab {
  background: var(--accent);
  border-color: var(--accent);
}
.skill-panel.open .skill-panel-tab .tab-icon {
  color: #fff;
}

.skill-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.skill-panel-header h3 {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
}

.skill-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

.skill-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  cursor: default;
  transition: background 0.1s;
  position: relative;
}
.skill-row:hover {
  background: var(--bg-muted);
}

.skill-toggle {
  display: flex;
  align-items: center;
  cursor: pointer;
  flex-shrink: 0;
}
.skill-toggle input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: var(--accent);
  cursor: pointer;
  margin: 0;
}

.skill-name {
  flex: 1;
  font-size: 12.5px;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.skill-info-btn {
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 14px;
  padding: 2px 4px;
  border-radius: 4px;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s;
}
.skill-row:hover .skill-info-btn {
  opacity: 1;
}
.skill-info-btn:hover {
  background: var(--bg-muted);
  color: var(--text);
}

/* Skill tooltip (on hover) — appears right of the panel, no scroll needed */
.skill-tooltip {
  position: fixed;
  z-index: 100;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  padding: 12px 14px;
  width: 300px;
  pointer-events: none;
  font-size: 12px;
  line-height: 1.5;
}
.skill-tooltip .tt-title {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 6px;
}
.skill-tooltip .tt-desc {
  color: var(--text-muted);
  margin-bottom: 8px;
}
.skill-tooltip .tt-section {
  margin-bottom: 6px;
}
.skill-tooltip .tt-label {
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.skill-tooltip .tt-tag {
  display: inline-block;
  background: var(--bg-muted);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 11px;
  margin: 1px 2px;
  font-family: var(--font-mono);
}

/* Skill detail modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-overlay.hidden { display: none; }

.modal-content {
  background: var(--bg);
  border-radius: 10px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.18);
  width: 700px;
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.modal-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}
.markdown-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
  font-size: 13.5px;
  line-height: 1.7;
}
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  margin-top: 1.2em;
  margin-bottom: 0.4em;
  font-weight: 600;
}
.markdown-body h1 { font-size: 20px; }
.markdown-body h2 { font-size: 16px; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.markdown-body h3 { font-size: 14px; }
.markdown-body p { margin: 0.5em 0; }
.markdown-body ul, .markdown-body ol { margin: 0.5em 0; padding-left: 1.5em; }
.markdown-body li { margin: 0.2em 0; }
.markdown-body code {
  background: var(--bg-muted);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 12px;
  font-family: var(--font-mono);
}
.markdown-body pre {
  background: var(--bg-muted);
  border-radius: 6px;
  padding: 12px 14px;
  overflow-x: auto;
  margin: 0.8em 0;
}
.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: 12px;
}

/* ===== Logs Modal ===== */

.logs-modal-content {
  width: 900px;
  max-width: 95vw;
  max-height: 85vh;
}

.logs-modal-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.logs-sidebar {
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.logs-path {
  padding: 10px 12px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  word-break: break-all;
  line-height: 1.4;
  flex-shrink: 0;
}

.logs-nav {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.logs-nav-btn {
  flex: 1;
  padding: 8px 0;
  font-size: 12px;
  font-weight: 600;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.logs-nav-btn:hover { color: var(--text); }
.logs-nav-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.logs-turn-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.logs-turn-item {
  padding: 8px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--border-light);
  transition: background 0.1s;
}
.logs-turn-item:hover { background: var(--bg-muted); }
.logs-turn-item.active { background: rgba(37, 99, 235, 0.08); border-left: 3px solid var(--accent); }

.logs-turn-item .turn-num {
  font-weight: 600;
  font-size: 12px;
}
.logs-turn-item .turn-preview {
  font-size: 11px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}
.logs-turn-item .turn-size {
  font-size: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.logs-detail {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  min-width: 0;
}
.logs-placeholder {
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
  margin-top: 60px;
}

/* Notebook viewer */
.nb-cell {
  margin-bottom: 12px;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  overflow: hidden;
}
.nb-cell-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-muted);
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text-muted);
}
.nb-cell-type {
  font-weight: 600;
  text-transform: uppercase;
}
.nb-cell-source {
  padding: 10px 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--bg);
}
.nb-cell-outputs {
  border-top: 1px solid var(--border-light);
  padding: 8px 12px;
  font-size: 12px;
  font-family: var(--font-mono);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  background: #fafbfc;
  max-height: 300px;
  overflow-y: auto;
}
.nb-cell-outputs .nb-stderr {
  color: #c0392b;
}
.nb-cell-outputs img {
  max-width: 100%;
  margin: 4px 0;
  border-radius: 4px;
}
.nb-markdown-cell {
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.6;
}