:root {
  /* Light theme */
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --text-muted: #475569;
  --panel-bg: #ffffff;
  --border-color: #e2e8f0;
  --header-bg: #f1f5f9;
  
  --table-th-bg: #f1f5f9;
  --table-th-text: #0f172a;
  --table-row-hover: #e0e7ff;
  --table-stripe: #f8fafc;
  
  --cell-hover: #c7d2fe;
  --cell-hover-text: #1e1b4b;
  --cell-selected: #6366f1;
  --cell-selected-text: #ffffff;
  
  --metric-good: #15803d;
  --metric-ok: #b45309;
  --metric-bad: #be123c;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Dark theme */
    --bg-color: #0f172a;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --panel-bg: #1e293b;
    --border-color: #334155;
    --header-bg: #1e293b;
    
    --table-th-bg: #0f172a;
    --table-th-text: #e2e8f0;
    --table-row-hover: #312e81;
    --table-stripe: #1e293b;
    
    --cell-hover: #3730a3;
    --cell-hover-text: #e0e7ff;
    --cell-selected: #4f46e5;
    --cell-selected-text: #ffffff;
    
    --metric-good: #4ade80;
    --metric-ok: #fbbf24;
    --metric-bad: #fb7185;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  line-height: 1.5;
}

.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

header {
  margin-bottom: 24px;
}

header h1 {
  margin: 0 0 8px 0;
  font-size: 1.5rem;
  font-weight: 700;
}

header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.controls {
  margin-bottom: 24px;
  background-color: var(--panel-bg);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
}

.controls label {
  font-weight: 600;
  font-size: 0.95rem;
}

select {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  min-width: 300px;
}

select:focus {
  border-color: var(--cell-selected);
  box-shadow: 0 0 0 2px var(--table-row-hover);
}

.workspace {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.panel {
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.left-panel {
  flex: 1;
  min-width: 600px;
  /* Not scrollable, fits contents */
}

.right-panel {
  flex: 1;
  min-width: 400px;
  height: 700px; /* fixed height for scrollability */
}

.table-container {
  width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem; /* 14px */
}

thead th {
  background-color: var(--table-th-bg);
  color: var(--table-th-text);
  font-weight: 600;
  padding: 10px 14px;
  border-bottom: 2px solid var(--border-color);
  text-align: center;
}

thead th:first-child {
  text-align: left;
}

tbody tr {
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.15s;
}

tbody tr:nth-child(even) {
  background-color: var(--table-stripe);
}

tbody tr:hover {
  background-color: var(--table-row-hover);
}

tfoot tr {
  background-color: var(--table-th-bg);
  font-weight: 600;
  border-top: 2px solid var(--border-color);
}

td {
  padding: 8px 14px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

td:first-child {
  text-align: left;
  font-weight: 500;
}

.cell-clickable {
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.cell-clickable:hover {
  background-color: var(--cell-hover) !important;
  color: var(--cell-hover-text) !important;
  font-weight: 700;
  box-shadow: inset 0 0 0 2px var(--cell-selected);
}

.cell-selected {
  background-color: var(--cell-selected) !important;
  color: var(--cell-selected-text) !important;
  font-weight: 700;
  box-shadow: inset 0 0 0 2px var(--cell-selected);
}

#instances-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--header-bg);
}

#instances-header h2 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-color);
}

.instances-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.instance-item {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-wrap: break-word;
}

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

.instances-empty {
  color: var(--text-muted);
  font-style: italic;
  padding: 12px;
  text-align: center;
}

/* Responsive */
@media (max-width: 1024px) {
  .workspace {
    flex-direction: column;
  }
  .left-panel, .right-panel {
    width: 100%;
    min-width: 0;
  }
}