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

:root {
  --bg: #f8f9fa;
  --surface: #ffffff;
  --border: #e0e0e0;
  --text: #333;
  --text-muted: #888;
  --primary: #4a90d9;
  --primary-hover: #3a7bc8;
  --accent: #2d8cf0;
  --danger: #e74c3c;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Main layout */
.main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.editor-panel {
  width: 40%;
  min-width: 360px;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

.editor-params {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
}

/* Config version badge */
.config-version {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.config-version .version-badge {
  display: inline-block;
  padding: 1px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text);
}

.editor-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  padding: 10px 20px;
}

.editor-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.viz-panel {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
}

/* Empty page content for non-config pages */
.page-content {
  flex: 1;
  padding: 32px 24px;
}

/* Parameter groups */
.param-group {
  margin-bottom: 4px;
}

.group-header {
  font-size: 14px;
  font-weight: 600;
  padding: 8px 0;
  cursor: pointer;
  user-select: none;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text);
}

.group-header::before {
  content: '\25BC';
  font-size: 10px;
  transition: transform 0.2s;
}

.group-header.collapsed::before {
  transform: rotate(-90deg);
}

.group-content {
  padding: 8px 0 4px;
}

.group-content.collapsed {
  display: none;
}

/* Parameter rows */
.param-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
  min-height: 36px;
}

.param-row:has(.key-chips) {
  align-items: flex-start;
  padding: 8px 0;
}

.param-row.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.param-row.has-warning .param-label {
  color: #e67e22;
}

.param-label {
  font-size: 13px;
  min-width: 140px;
  flex-shrink: 0;
  color: var(--text);
}

.param-control {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.param-unit {
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.param-help {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: help;
  flex-shrink: 0;
}

.param-tooltip {
  display: none;
  position: fixed;
  padding: 6px 10px;
  background: #333;
  color: #fff;
  font-size: 12px;
  font-weight: 400;
  border-radius: 4px;
  white-space: normal;
  width: 240px;
  z-index: 200;
  pointer-events: none;
  line-height: 1.4;
}

.param-tooltip.visible {
  display: block;
}

/* Validation warnings */
.validation-warning {
  font-size: 12px;
  color: #e67e22;
  padding: 2px 0 2px 152px;
}

/* Slider + number input */
.slider-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
}

.param-slider {
  flex: 1;
  min-width: 80px;
  accent-color: var(--primary);
  height: 4px;
}

.param-input {
  font-size: 13px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}

.param-input:focus {
  border-color: var(--primary);
}

.param-input.number {
  width: 80px;
  text-align: right;
  flex-shrink: 0;
}

.param-input.text {
  flex: 1;
  min-width: 0;
}

.param-input.select {
  flex: 1;
  min-width: 0;
}

/* Key chip selector */
.key-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
  flex: 1;
  min-width: 0;
}

.key-chip {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 12px;
  line-height: 1.4;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s;
  background: var(--surface);
  color: var(--text);
  white-space: nowrap;
}

.key-chip:hover {
  border-color: var(--primary);
}

.key-chip.selected {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.key-chip.custom {
  cursor: default;
  padding-right: 5px;
}

.key-chip.selected.custom {
  padding-right: 5px;
}

.key-chip-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 14px;
  height: 14px;
  border: none;
  background: rgba(0, 0, 0, 0.15);
  color: inherit;
  font-size: 11px;
  line-height: 1;
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
  margin-left: 1px;
}

.key-chip-remove:hover {
  background: rgba(0, 0, 0, 0.3);
}

.key-chip.custom.selected .key-chip-remove {
  background: rgba(255, 255, 255, 0.3);
}

.key-chip.custom.selected .key-chip-remove:hover {
  background: rgba(255, 255, 255, 0.5);
}

.key-add-btn {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border: 1px dashed var(--border);
  border-radius: 12px;
  font-size: 12px;
  color: var(--text-muted);
  cursor: pointer;
  background: none;
  transition: all 0.15s;
  white-space: nowrap;
}

.key-add-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.key-add-input {
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.key-add-input input {
  width: 52px;
  padding: 2px 6px;
  border: 1px solid var(--primary);
  border-radius: 12px;
  font-size: 12px;
  text-align: center;
  outline: none;
  background: var(--surface);
  color: var(--text);
  -moz-appearance: textfield;
}

.key-add-input input::-webkit-inner-spin-button,
.key-add-input input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.key-add-input input.error {
  border-color: var(--danger);
  animation: shake 0.3s;
}

.key-add-ok {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: none;
  background: var(--primary);
  color: white;
  font-size: 12px;
  border-radius: 50%;
  cursor: pointer;
  padding: 0;
}

.key-add-ok:hover {
  background: var(--primary-hover);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-3px); }
  40%, 80% { transform: translateX(3px); }
}

/* Toggle */
.toggle {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
  cursor: pointer;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 10px;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  top: 2px;
  background: white;
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle input:checked + .toggle-slider {
  background: var(--primary);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(16px);
}

/* Buttons */
.btn {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

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

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

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

/* TOML Preview */
.toml-section {
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.toml-section label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: block;
}

#toml-preview {
  width: 100%;
  height: 80px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 11px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  outline: none;
}

.next-steps {
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: 10px;
}

.next-steps-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.next-steps-list {
  font-size: 12px;
  color: var(--text-muted);
  padding-left: 18px;
  line-height: 1.6;
}

/* Visualization panel */
.viz-panel h2 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 12px;
}

.chart-container canvas {
  width: 100%;
  height: 180px;
  display: block;
}

.chart-label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

/* Scenario buttons */
.scenario-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.scenario-btn {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.scenario-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.scenario-tips {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  line-height: 1.5;
}

/* Summary readout */
.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.summary-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 12px;
}

.summary-item .summary-label {
  font-size: 11px;
  color: var(--text-muted);
  display: block;
}

.summary-item .summary-value {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.summary-hint {
  font-size: 11px;
  color: #e67e22;
  padding: 2px 0;
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .main {
    flex-direction: column;
  }

  .editor-panel {
    width: 100%;
    min-width: unset;
    max-height: 50vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .param-label {
    min-width: 100px;
  }

  .validation-warning {
    padding-left: 112px;
  }
}