/* Theme roles from the reference dataviz palette; dark mode is its own
   selected set of steps, not an automatic flip. */
:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11, 11, 11, 0.1);
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #ffffff;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255, 255, 255, 0.1);
    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

.app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 64px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.app-header {
  padding-top: 16px;
}

/* Pinned parameter bar: the controls follow the reader down the page, so the
   numbers they move are never a scroll away. */
.control-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 12px 20px;
  border-radius: 0 0 10px 10px;
  border-top: none;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.07);
}

.control-bar .controls {
  gap: 10px 22px;
}

.control-bar .control {
  min-width: 0;
}

.control-bar input[type='range'],
.control-bar select {
  width: 148px;
}

@media (prefers-color-scheme: dark) {
  .control-bar {
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
  }
}

.app-header h1 {
  font-size: 22px;
  font-weight: 650;
  margin: 0;
}

.app-header p {
  margin: 3px 0 0;
  color: var(--ink-2);
  max-width: 100ch;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
}

.card > h2 {
  font-size: 13px;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-2);
  margin: 0 0 12px;
}

.card-note {
  color: var(--muted);
  font-size: 12px;
  margin: 10px 0 0;
}

/* ---- controls ---- */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  align-items: flex-end;
}

.control {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 150px;
}

.control > label {
  font-size: 12px;
  color: var(--ink-2);
}

.control .value {
  color: var(--ink);
  font-weight: 600;
}

.control input[type='range'] {
  accent-color: var(--series-1);
  width: 170px;
  margin: 0;
}

.control select,
.control input[type='number'] {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--baseline);
  border-radius: 6px;
  padding: 4px 8px;
  font: inherit;
  width: 170px;
}

/* ---- plots ---- */

.filter-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 760px) {
  .filter-panels {
    grid-template-columns: 1fr;
  }
}

.panel h3 {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-2);
  margin: 0 0 6px;
}

.panel {
  position: relative;
}

.panel svg {
  display: block;
  width: 100%;
  height: auto;
}

.scroll-wrap {
  position: relative;
}

.scroll-canvas {
  display: block;
  width: 100%;
  height: 130px;
}

.play-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--surface);
  color: var(--ink-2);
  border: 1px solid var(--baseline);
  border-radius: 7px;
  padding: 4px 12px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.play-btn:hover {
  color: var(--ink);
}

.viz-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-size: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  white-space: nowrap;
  z-index: 10;
}

.viz-tooltip .tip-value {
  font-weight: 650;
  color: var(--ink);
}

.viz-tooltip .tip-label {
  color: var(--ink-2);
}

/* ---- stat tiles ---- */

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  margin-bottom: 12px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat .label {
  font-size: 12px;
  color: var(--ink-2);
}

.stat .value {
  font-size: 20px;
  font-weight: 600;
}

.stat .value small {
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
}

.stat-action {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 5px;
  font-size: 12px;
}

.stat-action button {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--baseline);
  border-radius: 6px;
  padding: 1px 10px;
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.stat-action button:hover {
  border-color: var(--series-1);
}

.estimate-status {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.measure-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 12px;
  font-size: 12px;
  color: var(--ink-2);
}

.measure-row label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.measure-row select {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--baseline);
  border-radius: 6px;
  padding: 2px 6px;
  font: inherit;
}

/* ---- compression chart ---- */

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.metric-hint {
  margin-left: 10px;
  font-size: 12px;
  color: var(--muted);
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--baseline);
  border-radius: 7px;
  overflow: hidden;
}

.segmented button {
  border: none;
  background: transparent;
  color: var(--ink-2);
  font: inherit;
  font-size: 12px;
  padding: 4px 10px;
  cursor: pointer;
}

.segmented button.active {
  background: var(--series-1);
  color: #fff;
}

.legend {
  display: flex;
  gap: 14px;
  font-size: 12px;
  color: var(--ink-2);
}

.legend .swatch {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  margin-right: 5px;
  vertical-align: -1px;
}

/* Hollow: the mark for a limit, matching the outlined bars. */
.legend .swatch.hollow {
  background: color-mix(in srgb, var(--muted) 12%, transparent);
  border: 1.25px solid var(--muted);
}

.chart-body {
  position: relative;
  transition: opacity 0.15s;
}

.chart-body.computing {
  opacity: 0.55;
}

.computing-badge {
  position: absolute;
  top: -2px;
  right: 0;
  font-size: 12px;
  color: var(--muted);
}

.bar-row-label {
  fill: var(--ink);
  font-size: 12px;
}

.bar-group-label {
  fill: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.bar-value {
  fill: var(--ink-2);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
}

/* Limit rows read one step quieter than the measured ones. */
.bar-row-label.bound,
.bar-value.bound {
  fill: var(--muted);
  font-style: italic;
}

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

.chart-table {
  margin-top: 10px;
  color: var(--ink-2);
  font-size: 12.5px;
}

.chart-table summary {
  cursor: pointer;
  color: var(--muted);
}

.chart-table table {
  margin-top: 8px;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.chart-table th,
.chart-table td {
  text-align: right;
  padding: 3px 14px 3px 0;
  border-bottom: 1px solid var(--grid);
}

.chart-table th:first-child,
.chart-table td:first-child {
  text-align: left;
}

.chart-table th {
  color: var(--muted);
  font-weight: 500;
}

.command-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

.command-row code {
  background: var(--page);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 11.5px;
  color: var(--ink-2);
  overflow-x: auto;
  white-space: nowrap;
  max-width: 100%;
}

.command-row button {
  background: var(--surface);
  color: var(--ink-2);
  border: 1px solid var(--baseline);
  border-radius: 6px;
  padding: 2px 10px;
  font: inherit;
  font-size: 11.5px;
  cursor: pointer;
}

.command-row button:hover {
  color: var(--ink);
}

/* ---- math ---- */

.math-section p {
  color: var(--ink-2);
  max-width: 76ch;
}

.math-section .katex-display {
  margin: 14px 0;
}