:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --surface-subtle: #fafafa;
  --border: #d7d7d7;
  --text: #1f1f1f;
  --text-muted: #666666;
  --accent: #1769aa;
  --accent-soft: #e8f2fb;
  --success: #1e7d32;
  --error: #c62828;
  --warning: #9a6700;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

.app {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 20px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.panel h3 {
  margin: 0 0 12px;
  font-size: 15px;
}

.section-heading {
  margin-top: 16px;
}

.muted {
  color: var(--text-muted);
  font-size: 13px;
}

/* Header */
.header {
  margin-bottom: 16px;
  padding: 8px 4px 14px;
  border-bottom: 1px solid var(--border);
}

.header h1 {
  margin: 0;
  font-size: 28px;
}

.header p {
  margin: 4px 0 0;
  color: var(--text-muted);
}

/* Tabs */
.app-tabs {
  display: flex;
  gap: 8px;
  margin: 0 0 16px;
}

.app-tab {
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}

.app-tab.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

/* Main config layout */
.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.config-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Shared form controls */
.search-input,
.combiner-input,
.combiner-select,
.file-input,
.param-row input[type="number"],
.optuna-config input[type="number"],
.column-selector-trigger,
.page-controls button {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.search-input,
.combiner-input,
.combiner-select,
.file-input {
  width: 100%;
  padding: 8px 10px;
}

.search-input:focus,
.combiner-input:focus,
.combiner-select:focus,
.file-input:focus,
.param-row input[type="number"]:focus,
.optuna-config input[type="number"]:focus,
.column-selector-trigger:focus {
  outline: 2px solid var(--accent-soft);
  border-color: var(--accent);
}

/* Target selector */
.selected-target {
  padding: 10px;
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 10px;
}

.question-list {
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.question-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}

.question-item:last-child {
  border-bottom: 0;
}

.question-item.active {
  background: var(--accent-soft);
}

.q-id {
  min-width: 66px;
  font-weight: 600;
  color: var(--accent);
}

.q-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.q-count {
  font-size: 12px;
  color: var(--text-muted);
}

.data-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 13px;
}

.composite-toggle {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.composite-check {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  background: var(--surface-subtle);
}

.composite-check.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.composite-check div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.composite-check strong {
  font-size: 13px;
}

.composite-check small {
  font-size: 12px;
  color: var(--text-muted);
}

.composite-partner-picker {
  margin-top: 8px;
}

.composite-partner-label {
  margin-top: 6px;
  color: var(--accent);
  font-size: 13px;
}

.btn-link {
  border: 0;
  background: transparent;
  color: var(--accent);
  padding: 0;
  cursor: pointer;
}

.btn-link:hover {
  text-decoration: underline;
}

/* Ranker */
.option-ranker {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.option-ranker h4 {
  margin: 0 0 8px;
  font-size: 14px;
}

.ranker-hint {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-size: 12px;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
  cursor: grab;
}

.rank-item.dragging {
  opacity: 0.55;
}

.rank-item.drag-over {
  border-color: var(--accent);
}

.rank-item.excluded {
  opacity: 0.6;
  border-style: dashed;
  cursor: default;
}

.rank-position {
  width: 18px;
  text-align: center;
  font-weight: 700;
}

.rank-handle {
  color: var(--text-muted);
}

.rank-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rank-count {
  color: var(--text-muted);
  font-size: 12px;
}

.rank-exclude {
  width: 24px;
  height: 24px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  cursor: pointer;
  color: var(--text-muted);
}

.rank-exclude.active {
  color: var(--success);
  border-color: var(--success);
}

/* Encoding selector */
.encoding-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.encoding-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
  cursor: pointer;
}

.encoding-option.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.encoding-option.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.encoding-option div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.encoding-option strong {
  font-size: 13px;
}

.encoding-option small {
  font-size: 12px;
  color: var(--text-muted);
}

/* Model selector */
.model-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.model-check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
  cursor: pointer;
  font-size: 13px;
}

.model-check.checked {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* Hyperparameter panel */
.model-params {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 10px;
}

.model-params-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  background: var(--surface-subtle);
  cursor: pointer;
}

.expand-icon {
  width: 14px;
  color: var(--text-muted);
  text-align: center;
}

.tuning-mode-toggle {
  margin-left: auto;
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.mode-btn {
  border: none;
  background: var(--surface);
  padding: 4px 10px;
  font-size: 11px;
  cursor: pointer;
  color: var(--text-muted);
  border-right: 1px solid var(--border);
}

.mode-btn:last-child {
  border-right: none;
}

.mode-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

.mode-btn:hover:not(.active) {
  background: var(--surface-subtle);
}

.param-row input[readonly] {
  background: var(--surface-subtle);
  color: var(--text-muted);
}

.params-body {
  border-top: 1px solid var(--border);
  padding: 12px;
}

.manual-params {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.param-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.param-row label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.param-row input[type="number"] {
  width: 90px;
  padding: 4px 6px;
  text-align: right;
}

.param-row small {
  color: var(--text-muted);
  font-size: 11px;
}

.optuna-config label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.optuna-config input[type="number"] {
  width: 72px;
  padding: 4px 6px;
  text-align: right;
}

/* Buttons */
.btn-train,
.btn-download,
.btn-retry,
.btn-subtle,
.btn-cancel {
  border-radius: 6px;
  cursor: pointer;
}

.btn-train,
.btn-download,
.btn-retry {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.btn-train:disabled,
.btn-download:disabled,
.btn-retry:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-train {
  padding: 10px 22px;
  font-weight: 600;
}

.btn-download {
  padding: 6px 12px;
}

.btn-retry {
  padding: 10px 20px;
  font-weight: 600;
}

.btn-subtle {
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: var(--surface);
}

.btn-cancel {
  padding: 4px 10px;
  border: 1px solid var(--error);
  background: var(--surface);
  color: var(--error);
}

.train-actions {
  text-align: center;
  margin: 16px 0;
}

.time-estimate {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Progress */
.progress-tracker {
  border-left: 4px solid var(--accent);
}

.progress-tracker.error {
  border-left-color: var(--error);
}

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

.progress-header h3 {
  margin-bottom: 0;
}

.progress-timing {
  display: flex;
  gap: 12px;
  margin-left: auto;
  font-size: 12px;
}

.progress-elapsed {
  color: var(--text-muted);
}

.progress-eta {
  color: var(--accent);
}

.progress-bar-container {
  position: relative;
  margin: 10px 0 8px;
  height: 24px;
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--accent);
}

.progress-pct {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  font-size: 11px;
  font-weight: 600;
}

.progress-message {
  font-size: 13px;
  margin-bottom: 8px;
}

.progress-log {
  max-height: 150px;
  overflow-y: auto;
  border: 1px solid var(--border);
  background: var(--surface-subtle);
  border-radius: 6px;
  padding: 8px;
  font-size: 12px;
}

.log-entry {
  padding: 2px 0;
  color: var(--text-muted);
}

.log-entry.done {
  color: var(--success);
}

/* Results */
.results-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
  font-size: 12px;
}

.results-meta span {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
}

.metrics-table {
  overflow-x: auto;
  margin-bottom: 12px;
}

.metrics-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.metrics-table th,
.metrics-table td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  white-space: nowrap;
}

.metrics-table th {
  background: var(--surface-subtle);
  cursor: pointer;
}

.metrics-table td.best {
  color: var(--success);
  font-weight: 700;
}

.model-tabs {
  display: flex;
  gap: 6px;
  margin: 14px 0 10px;
  border-bottom: 1px solid var(--border);
}

.tab {
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-muted);
  padding: 8px 10px;
  cursor: pointer;
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.model-details {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: start;
}

.confusion-matrix,
.feature-importance,
.model-comparison-chart {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
  padding: 10px;
  overflow-x: auto;
}

.confusion-matrix h4,
.feature-importance h4,
.model-comparison-chart h4 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Output preview */
.predictions-section {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.predictions-section h4 { margin: 0; font-size: 14px; }
.predictions-section select {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
}
.pred-null { color: var(--text-muted); }
.pred-match { color: var(--success, #2ea043); font-weight: 600; }

.output-preview {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.output-preview h4 {
  margin: 0;
  font-size: 14px;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.output-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.output-loading,
.output-empty,
.output-error {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
  text-align: center;
  color: var(--text-muted);
}

.output-error {
  color: var(--error);
}

.output-pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  flex-wrap: wrap;
}

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

.page-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-controls button {
  padding: 4px 10px;
  background: var(--surface);
  cursor: pointer;
}

.page-controls button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Column selector */
.column-selector {
  position: relative;
}

.column-selector-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--surface);
  cursor: pointer;
}

.column-selector-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  width: min(360px, 85vw);
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  z-index: 10;
  overflow: hidden;
}

.column-limit-warning {
  padding: 8px 10px;
  font-size: 11px;
  background: #fff8e1;
  color: var(--warning);
  border-bottom: 1px solid var(--border);
}

.column-group {
  border-bottom: 1px solid var(--border);
}

.column-group:last-child {
  border-bottom: 0;
}

.column-group-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  background: var(--surface-subtle);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-muted);
}

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

.column-group-actions button {
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 10px;
  cursor: pointer;
}

.column-list {
  padding: 6px;
}

.column-list.scrollable {
  max-height: 220px;
  overflow-y: auto;
}

.column-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 4px;
  font-size: 12px;
}

.column-item.checked {
  background: var(--accent-soft);
}

.column-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.column-tag {
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
}

.column-tag.prediction {
  background: var(--accent-soft);
  color: var(--accent);
}

/* Data table */
.data-table-empty {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-subtle);
  text-align: center;
  color: var(--text-muted);
}

.data-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  white-space: nowrap;
}

.data-table th,
.data-table td {
  border: 1px solid var(--border);
  padding: 7px 10px;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.data-table th {
  position: sticky;
  top: 0;
  background: var(--surface-subtle);
  text-align: left;
}

.data-table td.prediction {
  color: var(--accent);
  font-family: Consolas, Monaco, monospace;
}

/* Parquet combiner */
.parquet-combiner code,
.offline-help code {
  font-family: Consolas, Monaco, monospace;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface-subtle);
  padding: 2px 6px;
}

.combiner-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.combiner-control {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.combiner-label {
  font-size: 13px;
  font-weight: 600;
}

.combiner-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.file-list,
.parquet-columns-list {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  max-height: 300px;
  overflow-y: auto;
}

.file-row,
.parquet-col {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-subtle);
}

.file-row:last-child,
.parquet-col:last-child {
  border-bottom: 0;
}

.file-name,
.parquet-col-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  color: var(--text-muted);
  font-size: 12px;
}

.parquet-columns-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.parquet-col.checked {
  background: var(--accent-soft);
}

.parquet-col-tag {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 7px;
  font-size: 10px;
  color: var(--text-muted);
}

.parquet-col-tag.accent {
  border-color: var(--accent);
  color: var(--accent);
}

.combiner-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.combiner-warning {
  border: 1px solid #f1c35d;
  border-radius: 6px;
  background: #fff8e1;
  color: var(--warning);
  padding: 10px;
  font-size: 13px;
}

.parquet-output {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.parquet-output h4 {
  margin: 0 0 6px;
  font-size: 14px;
}

.parquet-order-list {
  max-height: 320px;
  overflow-y: auto;
}

.parquet-preview {
  margin-top: 12px;
}

.combiner-success {
  color: var(--success);
  font-size: 13px;
}

.combiner-error {
  color: var(--error);
  font-size: 13px;
}

/* Error banner */
.error-banner {
  border-color: var(--error);
  color: var(--error);
  background: #fdecec;
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: space-between;
}

.error-banner button {
  border: 1px solid var(--error);
  background: var(--surface);
  color: var(--error);
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
}

/* (Loading screen and offline page removed — server-rendered now) */

/* (Offline help styles removed) */

/* (Troll gate styles removed) */

/* Responsive */
@media (max-width: 920px) {
  .config-grid,
  .model-details,
  .combiner-grid {
    grid-template-columns: 1fr;
  }

  .model-grid {
    grid-template-columns: 1fr 1fr;
  }

  .manual-params {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app {
    padding: 12px;
  }

  .model-grid {
    grid-template-columns: 1fr;
  }

  .app-tabs {
    flex-wrap: wrap;
  }

  .progress-timing {
    margin-left: 0;
  }
}