.viz-root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface-1: #fcfcfb;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.1);
  --wash: rgba(11, 11, 11, 0.04);
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --critical: #d03b3b;
  --accent: #2a78d6;
  --accent-ink: #ffffff;
}
@media (prefers-color-scheme: dark) {
  .viz-root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface-1: #1a1a19;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.1);
    --wash: rgba(255, 255, 255, 0.05);
    --series-1: #3987e5;
    --series-2: #d95926;
    --accent: #3987e5;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  line-height: 1.4;
}

.viz-root {
  min-height: 100vh;
  background: var(--page);
  color: var(--text-primary);
  padding: 32px 16px 48px;
}

.viz-root > * {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

h1 {
  font-size: 28px;
  font-weight: 600;
  margin: 0;
}

h2 {
  font-size: 15px;
  font-weight: 600;
  margin: 0;
}

.sub,
.status,
footer {
  color: var(--text-secondary);
  font-size: 14px;
}

.sub {
  margin: 4px 0 0;
}

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 24px;
}

.controls label {
  color: var(--text-secondary);
  font-size: 14px;
}

select,
button {
  font: inherit;
  /* 16px or more stops iOS Safari zooming the page when the menu is focused. */
  font-size: 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 8px 12px;
}

select {
  flex: 1;
  min-width: 0;
  background: var(--surface-1);
  color: var(--text-primary);
}

button {
  min-width: 96px;
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
  font-weight: 600;
  cursor: pointer;
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

@media (max-width: 480px) {
  .controls {
    flex-wrap: wrap;
  }
  .controls label {
    flex: 1 1 100%;
  }
  .controls select {
    flex: 1 1 100%;
  }
  .controls button {
    flex: 1 1 100%;
    padding: 12px;
  }
}

button.stop {
  background: var(--surface-1);
  color: var(--text-primary);
  border-color: var(--border);
}

.status {
  margin-top: 12px;
  margin-bottom: 0;
  min-height: 1.4em;
}

.error {
  margin-top: 8px;
  margin-bottom: 0;
  color: var(--critical);
  font-size: 14px;
}

.error::before {
  content: '⚠ ';
}

.tiles {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}

@media (max-width: 560px) {
  .tiles {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tile,
.chart-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.tile {
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tile .label {
  color: var(--text-secondary);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.tile .num {
  font-size: 28px;
  font-weight: 600;
}

.tile .unit {
  color: var(--text-muted);
  font-size: 14px;
}

.tile.active .num {
  color: var(--text-secondary);
}

.key {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.line-key {
  display: inline-block;
  width: 14px;
  height: 2px;
  border-radius: 1px;
}

.key-1 {
  background: var(--series-1);
}

.key-2 {
  background: var(--series-2);
}

.chart-card {
  margin-top: 16px;
  padding: 14px 14px 10px;
}

.chart-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 14px;
  font-size: 13px;
  color: var(--text-secondary);
}

.legend li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.chart {
  position: relative;
  margin-top: 8px;
}

.chart svg {
  display: block;
  max-width: 100%;
  overflow: visible;
  /* Horizontal drags scrub the readout; vertical ones still scroll the page. */
  touch-action: pan-y;
  -webkit-tap-highlight-color: transparent;
}

.chart svg:focus {
  outline: none;
}

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

.chart .grid {
  stroke: var(--grid);
  stroke-width: 1;
}

.chart .baseline {
  stroke: var(--axis);
  stroke-width: 1;
}

.chart .tick {
  fill: var(--text-muted);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.chart .warmup {
  fill: var(--wash);
}

.chart .warmup-label {
  fill: var(--text-muted);
  font-size: 11px;
}

.chart .series {
  fill: none;
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.chart .s1 {
  stroke: var(--series-1);
}

.chart .s2 {
  stroke: var(--series-2);
}

.chart .dot {
  stroke: var(--surface-1);
  stroke-width: 2;
}

.chart .dot.s1 {
  fill: var(--series-1);
}

.chart .dot.s2 {
  fill: var(--series-2);
}

.chart .end-label {
  fill: var(--text-secondary);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.chart .crosshair {
  stroke: var(--axis);
  stroke-width: 1;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  white-space: nowrap;
}

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

.tooltip .row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tooltip .row strong {
  font-variant-numeric: tabular-nums;
}

.tooltip .row span:last-child {
  color: var(--text-secondary);
}

details {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

summary {
  cursor: pointer;
}

table {
  margin-top: 8px;
  border-collapse: collapse;
  width: 100%;
  font-variant-numeric: tabular-nums;
}

th,
td {
  text-align: right;
  padding: 3px 8px;
  border-bottom: 1px solid var(--grid);
}

th {
  font-weight: 600;
  color: var(--text-secondary);
}

footer {
  margin-top: 24px;
}

footer a {
  color: inherit;
}