:root {
  color-scheme: light;
  --page: #f6f6f3;
  --surface: #fcfcfb;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --muted: #898781;
  --grid: #e1e0d9;
  --axis: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --accent: #2a78d6;
  --accent-wash: rgba(42, 120, 214, 0.10);
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --good: #006300;
  --bad: #c03030;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --ink: #f0efec;
    --ink-2: #c3c2b7;
    --muted: #898781;
    --grid: #2c2c2a;
    --axis: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --accent: #3987e5;
    --accent-wash: rgba(57, 135, 229, 0.16);
    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;
    --good: #0ca30c;
    --bad: #e66767;
    --shadow: none;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 32px 16px 64px;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px;
  line-height: 1.55;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
}

a {
  color: var(--accent);
}

/* Header */

.back {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

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

h1 {
  margin: 0 0 6px;
  font-size: 28px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.lead {
  margin: 0 0 24px;
  max-width: 760px;
  color: var(--ink-2);
  font-size: 16px;
}

h2 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 600;
}

.card-sub {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

/* Layout */

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.controls {
  position: sticky;
  top: 16px;
}

.content {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 20px;
  min-width: 0;
}

.plot {
  width: 100%;
  height: 380px;
}

.plot.tall {
  height: 480px;
}

.plot.short {
  height: 280px;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }
  .controls {
    position: static;
  }
}

/* Controls */

.group + .group {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.group-title {
  margin: 0 0 4px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.field {
  margin-top: 14px;
}

.field-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
  font-size: 14px;
  color: var(--ink-2);
}

.field-head output {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--ink);
}

.field-head input[type="number"] {
  width: 5em;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  text-align: right;
}

input[type="range"] {
  width: 100%;
  margin: 4px 0;
  accent-color: var(--accent);
}

select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

.check {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-2);
  cursor: pointer;
}

.check input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  margin: 0;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

button {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
}

button:hover {
  background: var(--accent-wash);
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

button.primary:hover {
  filter: brightness(1.08);
}

.formula {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

/* Explanatory text */

.notes {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--ink-2);
}

.notes p {
  margin: 0 0 10px;
}

.notes ol {
  margin: 0;
  padding-left: 20px;
}

.notes li + li {
  margin-top: 6px;
}

.try {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

/* Stat tiles */

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 20px;
}

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

.tile .value {
  margin-top: 2px;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.tile .detail {
  font-size: 13px;
  color: var(--ink-2);
}

.good {
  color: var(--good);
}

.bad {
  color: var(--bad);
}

/* Tabs and tables */

.tabs {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  margin-bottom: 12px;
  border-radius: 10px;
  background: var(--page);
}

.tabs button {
  border: none;
  background: none;
  color: var(--ink-2);
}

.tabs button.active {
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  text-align: right;
}

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

th {
  font-weight: 600;
  font-size: 13px;
  color: var(--muted);
}

pre {
  margin: 0;
  overflow-x: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink);
}

/* Index page */

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.app-card {
  display: block;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s;
}

.app-card:hover {
  border-color: var(--accent);
}

.app-card h2 {
  font-size: 16px;
  margin-bottom: 6px;
}

.app-card p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-2);
}

.app-card .topic {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

.swatch {
  display: inline-block;
  width: 14px;
  height: 3px;
  margin-right: 8px;
  border-radius: 2px;
  vertical-align: middle;
}

.swatch.dashed {
  background: none !important;
  border-top: 3px dashed;
  height: 0;
}

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