:root {
  --bg: #fbfaf8;
  --bg-panel: #ffffff;
  --bg-sunk: #f2efea;
  --ink: #1b1a18;
  --ink-soft: #55514b;
  --ink-faint: #8b857d;
  --line: #e2ddd5;
  --accent: #0f6b5c;
  --accent-soft: #e6f2ef;
  --warn: #8a4b12;
  --warn-soft: #fbf0e3;
  /* Maps need their own land/sea pair. Reusing --line left the coastline almost
     invisible against the panel, which made the tracks impossible to place. */
  --map-sea: #eef3f6;
  --map-land: #d9d3c6;
  --map-edge: #a79f8e;
  /* Prose width. `none` makes text span the panel edges exactly; set a px
     value here (e.g. 820px) to pull it back in without touching anything else. */
  --measure: none;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --bg-panel: #1c1f24;
    --bg-sunk: #22262c;
    --ink: #eceae6;
    --ink-soft: #b3aea6;
    --ink-faint: #837d74;
    --line: #2e333a;
    --accent: #4fd1b5;
    --accent-soft: #14312b;
    --warn: #e0a86a;
    --warn-soft: #33261a;
    --map-sea: #101a22;
    --map-land: #39424c;
    --map-edge: #5d6875;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------------------------------------------------------------- hero */

.hero {
  background: var(--bg-sunk);
  border-bottom: 1px solid var(--line);
  padding: 72px 0 40px;
}

.kicker {
  margin: 0 0 12px;
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

h1 {
  margin: 0 0 20px;
  font: 400 clamp(38px, 7vw, 66px)/1.02 var(--serif);
  letter-spacing: -0.02em;
}

.lede {
  margin: 0 0 36px;
  max-width: var(--measure);
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--ink-soft);
}

.lede strong { color: var(--ink); }

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1px;
  margin: 0 0 24px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}

.stats > div {
  background: var(--bg-panel);
  padding: 16px 18px;
}

.stats dt {
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 8px;
}

.stats dd {
  margin: 0;
  font: 400 26px/1.1 var(--serif);
  font-variant-numeric: tabular-nums;
}

.stats dd small {
  display: block;
  margin-top: 4px;
  font: 400 12px/1.3 var(--sans);
  color: var(--ink-faint);
}

.provenance {
  margin: 0;
  font: 400 12px/1.6 var(--mono);
  color: var(--ink-faint);
}

/* ------------------------------------------------------------- sections */

main { padding: 8px 0 40px; }

section {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

section:last-of-type { border-bottom: 0; }

h2 {
  margin: 0 0 16px;
  font: 400 clamp(23px, 3.4vw, 31px)/1.2 var(--serif);
  letter-spacing: -0.01em;
}

h3 {
  margin: 0 0 12px;
  font: 600 13px/1.3 var(--sans);
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}

/* Prose runs the full container width, the same edges as the maps and panels.
   Measured in px rather than ch on purpose: a 13px caption and a 16px paragraph
   capped at the same `ch` value come out visibly different widths, which is why
   the captions used to sit narrower than the text above them. */
section > p {
  max-width: var(--measure);
  margin: 0 0 24px;
  color: var(--ink-soft);
}

section > p strong { color: var(--ink); }

code {
  font: 0.88em var(--mono);
  background: var(--bg-sunk);
  padding: 1px 5px;
  border-radius: 3px;
}

/* --------------------------------------------------------------- panels */

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.panel.wide { padding: 16px; }

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 20px;
}

.grid-2 .panel { margin-bottom: 0; }

.chart { overflow-x: auto; }

.chart svg { display: block; max-width: 100%; height: auto; }

.caption {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-faint);
}

.caption strong { color: var(--ink-soft); }

.callout {
  margin: 0 0 12px;
  padding: 16px 18px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  font-size: 15px;
  max-width: none;
}

.callout.warn {
  background: var(--warn-soft);
  border-left-color: var(--warn);
}

.callout strong { color: var(--ink); }

/* --------------------------------------------------------------- tables */

/* Seven columns cannot fit a phone. Scroll the table inside its panel rather than
   letting it push the whole page sideways. */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table.data {
  width: 100%;
  min-width: 470px;
  border-collapse: collapse;
  font-size: 13.5px;
  font-variant-numeric: tabular-nums;
}

table.data th,
table.data td {
  text-align: right;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
}

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

table.data thead th {
  font: 500 11px/1.3 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  vertical-align: bottom;
}

table.data tbody tr:last-child td { border-bottom: 0; }

table.data .num { font-variant-numeric: tabular-nums; }

/* -------------------------------------------------------------- caveats */

.caveats {
  max-width: var(--measure);
  margin: 0;
  padding: 0;
  list-style: none;
}

.caveats li {
  padding: 12px 0 12px 20px;
  border-left: 2px solid var(--line);
  margin-bottom: 4px;
  color: var(--ink-soft);
}

.caveats strong { color: var(--ink); }

/* --------------------------------------------------------------- footer */

footer {
  padding: 40px 24px 64px;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 13.5px;
}

footer p { max-width: var(--measure); }

.links { display: flex; flex-wrap: wrap; gap: 20px; margin: 20px 0; }

.links a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.links a:hover { border-bottom-color: var(--accent); }

.fineprint { font-size: 12px; }

/* ---------------------------------------------------- definition block */

.definition {
  max-width: 1080px;
  margin: 0 auto;
  padding: 44px 24px 8px;
}

.definition h2 { margin-bottom: 12px; }

.definition > p { max-width: var(--measure); color: var(--ink-soft); }

.steps {
  max-width: var(--measure);
  margin: 22px 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  counter-increment: step;
  padding: 0 0 18px 44px;
  color: var(--ink-soft);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent);
  font: 600 12px/25px var(--mono);
  text-align: center;
}

.steps strong { color: var(--ink); }

.source-note {
  font-size: 16px;
  border-left: 3px solid var(--line);
  padding-left: 18px;
}

.source-note a { color: var(--accent); }

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

.mapbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.mapbar-label {
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 2px;
  padding: 2px;
  background: var(--bg-sunk);
  border: 1px solid var(--line);
  border-radius: 7px;
}

.segmented button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font: 500 12.5px/1 var(--sans);
  padding: 7px 12px;
  border-radius: 5px;
  cursor: pointer;
}

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

.segmented button[aria-pressed="true"] {
  background: var(--bg-panel);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.16);
}

.clear-sel {
  margin-left: auto;
  appearance: none;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink-soft);
  font: 500 12px/1 var(--sans);
  padding: 7px 11px;
  cursor: pointer;
}

.clear-sel:hover { border-color: var(--accent); color: var(--accent); }

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

.howto summary {
  cursor: pointer;
  font: 500 12.5px/1.4 var(--sans);
  color: var(--accent);
}

.defs {
  margin: 14px 0 0;
  font-size: 13.5px;
  color: var(--ink-faint);
}

.defs dt {
  font: 600 12px/1.4 var(--sans);
  color: var(--ink-soft);
  margin-top: 12px;
}

.defs dd { margin: 4px 0 0; }

.stats.compact { margin-top: 18px; }

.stats.compact dd { font-size: 20px; }

/* ------------------------------------------------------------ plot bits */

/* Observable Plot injects its own styles; these keep it in the page's palette. */
figure { margin: 0; }

.plot-missing {
  padding: 28px 16px;
  background: var(--bg-sunk);
  border: 1px dashed var(--line);
  border-radius: 6px;
  color: var(--ink-faint);
  font: 13px/1.5 var(--mono);
  text-align: center;
}

.legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
  font: 12px var(--mono);
  color: var(--ink-faint);
}

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

.legend-row i {
  width: 22px;
  height: 3px;
  border-radius: 2px;
  display: inline-block;
}

@media (max-width: 640px) {
  .hero { padding: 48px 0 32px; }
  section { padding: 36px 0; }
  .stats dd { font-size: 22px; }
}

/* The band rate actually used, in the family-severity table. */
table.data tr.chosen td {
  background: var(--accent-soft);
}

table.data tr.chosen td:first-child {
  box-shadow: inset 3px 0 0 var(--accent);
}

table.data em {
  font-style: normal;
  color: var(--accent);
  font-size: 0.86em;
}

.callout a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.subhead {
  margin: 34px 0 10px;
  font: 400 clamp(19px, 2.6vw, 24px)/1.25 var(--serif);
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* Period badge: which slice of the record a chart covers. The page mixes two-day,
   four-day and 28-year panels, so every chart states its own span. */
.period {
  margin: 0 0 10px;
  font: 500 10.5px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  display: flex;
  align-items: center;
  gap: 8px;
}

.period::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 2px;
  border-radius: 1px;
  background: var(--accent);
  opacity: 0.8;
}