/* Shared by index.html (one city at a time) and compare.html (all six at
   once). Extracted from index.html when the second page arrived: two copies
   of a palette drift apart, and the whole point of the theme variables is
   that a colour is defined once. */

:root {
  color-scheme: light;
  --page: #f4f3f0;
  --surface: #ffffff;
  --surface-2: #fbfaf8;
  --ink: #14130f;
  --ink2: #55534d;
  --muted: #8a867d;
  --grid: #ebe9e3;
  --axis: #d7d5cc;
  --border: rgba(15, 14, 10, 0.09);
  --accent: #2a6fdb;
  --good: #0a9a2e;
  --warn: #c98500;
  --crit: #d03b3b;
  /* No drop shadow. Nothing on this page floats above anything else, so a
     shadow would be decoration pretending to be depth. Cards are separated
     by a hairline and a change of surface, the way a printed table is. */
  --shadow: none;
  --radius: 6px;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0c0c0d;
  --surface: #17171a;
  --surface-2: #1d1d20;
  --ink: #f4f4f2;
  --ink2: #b8b7b0;
  --muted: #8b8983;
  --grid: #29292c;
  --axis: #3a3a3e;
  --border: rgba(255, 255, 255, 0.09);
  --accent: #5a9bff;
  --good: #26c24a;
  --warn: #f0b03a;
  --crit: #e05656;
  --shadow: none;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #0c0c0d;
    --surface: #17171a;
    --surface-2: #1d1d20;
    --ink: #f4f4f2;
    --ink2: #b8b7b0;
    --muted: #8b8983;
    --grid: #29292c;
    --axis: #3a3a3e;
    --border: rgba(255, 255, 255, 0.09);
    --accent: #5a9bff;
    --good: #26c24a;
    --warn: #f0b03a;
    --crit: #e05656;
    --shadow: none;
  }
}
/* Headings in a serif. system-ui everywhere is what you get when nobody
   chose a typeface; a serif for headings against a sans for data is the
   old newspaper split, and it costs nothing to load. */
:root {
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
}
h1, h2, h3, .tile-v, .verdict b { font-family: var(--serif); font-weight: 600; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background 0.2s ease, color 0.2s ease;
}
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ---------- header ---------- */
header { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; padding: 36px 0 0; }
.title-row { display: flex; align-items: center; gap: 12px; }
h1 { margin: 0; font-size: 28px; }
/* A plain word, not a pill with a glowing dot. The page is rebuilt weekly,
   which is worth stating and isn't worth a fake telemetry indicator. */
.live { font-size: 12.5px; color: var(--good); font-weight: 500; }
.live .dot { display: none; }
.lede { margin: 10px 0 0; color: var(--ink2); font-size: 15.5px; max-width: 64ch; }
.built { margin: 8px 0 0; color: var(--muted); font-size: 12.5px; }
.theme-btn {
  flex: none; width: 38px; height: 38px; border-radius: 6px; border: 1px solid var(--border);
  background: var(--surface); color: var(--ink2); cursor: pointer; font-size: 17px; line-height: 1;
  display: grid; place-items: center; box-shadow: var(--shadow);
}
.theme-btn:hover { color: var(--ink); }

/* ---------- toolbar ---------- */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 24px 0 0; }
/* wraps rather than overflowing once there are more cities than fit a row */
.segmented {
  display: inline-flex; flex-wrap: wrap; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 6px; padding: 3px; gap: 2px;
}
.segmented button {
  appearance: none; border: 0; background: transparent; color: var(--ink2);
  font: inherit; font-size: 13.5px; font-weight: 500; padding: 7px 14px; border-radius: 4px;
  cursor: pointer; white-space: nowrap; transition: background 0.15s ease, color 0.15s ease;
}
.segmented button:hover { color: var(--ink); }
.segmented button[aria-selected="true"] {
  background: var(--surface); color: var(--ink); box-shadow: var(--shadow); font-weight: 600;
}
.story { margin: 16px 0 0; color: var(--ink2); font-size: 15px; max-width: 78ch; }
/* Says out loud when a source has too little history to read much into,
   rather than letting a two-point chart pass for a trend. */
.story-caveat { color: var(--muted); }

/* ---------- KPI tiles ---------- */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin: 20px 0 4px; }
.tile {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 15px 17px; box-shadow: var(--shadow);
}
.tile-v { font-size: 30px; line-height: 1.05; }
.tile-u { font-family: system-ui, sans-serif; font-size: 14px; font-weight: 400; color: var(--muted); margin-left: 4px; }
.tile-k { color: var(--muted); font-size: 12.5px; margin-top: 5px; }
.tile-k .accent { color: var(--ink2); font-weight: 600; }

/* ---------- chart grid ---------- */
.charts { display: grid; grid-template-columns: repeat(auto-fit, minmax(480px, 1fr)); gap: 18px; margin: 18px 0 10px; }
/* The coefficient card holds a small-multiples grid, one panel per
   feature, so it takes the whole row rather than sharing it. */
.card-wide { grid-column: 1 / -1; }
/* The UA stylesheet's `[hidden] { display: none }` loses to any author rule
   that sets display, and .card below sets display:flex. Without this, a card
   the renderer hid stayed on screen: the benchmark card kept showing the
   previously selected city's numbers on a source that has no benchmark. */
[hidden] { display: none !important; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 18px 12px; box-shadow: var(--shadow); min-width: 0; display: flex; flex-direction: column;
}
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.card h3 { margin: 0; font-size: 17px; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: center; }
.lg { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink2); white-space: nowrap; }
.lg .swatch { width: 15px; height: 3px; border-radius: 2px; }
.lg .swatch.dot { width: 9px; height: 9px; border-radius: 50%; }
.lg .swatch.dash { width: 15px; height: 0; border-top: 2px dotted currentColor; opacity: 0.75; background: none; }
.lg .swatch.star { width: 0; height: 0; color: inherit; }
.desc { margin: 8px 0 2px; font-size: 13px; color: var(--muted); }
.plot { margin-top: 6px; }

/* ---------- how to read this ---------- */
/* Collapsed by default and directly under the chart it explains: a reader who
   already knows how to read a skill score should not have to scroll past a
   paragraph telling them, and a reader who does not should not have to guess.
   `<details>` brings its own keyboard handling and open state, and prints
   expanded, which a class-toggled div would not. */
.guide { margin: 10px 0 0; border-top: 1px solid var(--border); }
.guide > summary {
  padding: 9px 0 0; font-size: 12px; font-weight: 500; color: var(--accent);
  cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
  /* Both, because Safari still reads the -webkit- rule and nothing else does. */
  list-style: none;
}
.guide > summary::-webkit-details-marker { display: none; }
.guide > summary::before { content: "B8"; font-size: 10px; line-height: 1; }
.guide[open] > summary::before { content: "BE"; }
.guide > summary:hover { text-decoration: underline; }
.guide > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
.guide-body { font-size: 12.5px; line-height: 1.5; color: var(--muted); max-width: 92ch; padding: 2px 0 10px; }
.guide-body p { margin: 9px 0 0; }
.guide-body strong { color: var(--ink2); font-weight: 600; }
.guide-body code { font-size: 11.5px; background: var(--grid); padding: 1px 4px; border-radius: 3px; }
.guide-lead { margin-bottom: 2px; }
/* Condition on the left, reading on the right: the reader arrives knowing which
   way their line went and scans one column to find it. */
.guide-moves { margin: 4px 0 0; display: grid; grid-template-columns: minmax(0, 15em) 1fr; gap: 4px 14px; }
.guide-moves dt { color: var(--ink2); font-weight: 600; }
.guide-moves dd { margin: 0; }
@media (max-width: 620px) {
  .guide-moves { grid-template-columns: 1fr; gap: 1px 0; }
  .guide-moves dd { margin: 0 0 7px; }
}

/* ---------- map card ---------- */
/* Globe left, city list right. The list is not decoration: it is the
   keyboard-reachable equivalent of clicking a marker, and it still works
   if Plotly's topojson assets fail to load. */
.map-card { margin: 20px 0 0; }
.map-body {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(250px, 0.62fr);
  gap: 16px; align-items: start; margin-top: 8px;
}
#globe { min-width: 0; }
.city-cap { color: var(--muted); font-size: 12px; margin: 0 0 8px; }
.city-row {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  appearance: none; font: inherit; cursor: pointer; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 12px;
  margin-bottom: 8px; transition: background 0.15s ease, border-color 0.15s ease;
}
.city-row:hover { border-color: var(--accent); }
.city-row[aria-selected="true"] {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  border-color: var(--accent);
}
.city-row .cmain { flex: 1; min-width: 0; }
.city-row .cname { display: block; font-size: 14px; font-weight: 600; color: var(--ink); }
.city-row .csub { display: block; font-size: 11.5px; color: var(--muted); margin-top: 2px; }
.city-row .pill {
  flex: none; font-size: 11.5px; font-weight: 600; padding: 3px 9px;
  border-radius: 3px; border: 1px solid; white-space: nowrap;
}
@media (max-width: 760px) { .map-body { grid-template-columns: 1fr; } }

/* ---------- benchmark card ---------- */
.bench-card { margin: 18px 0 0; }
.bench-wrap { overflow-x: auto; margin-top: 10px; }
table.bench { border-collapse: collapse; width: 100%; font-size: 13px; min-width: 460px; }
table.bench th {
  text-align: left; font-weight: 600; color: var(--muted); font-size: 11.5px;
  padding: 0 12px 7px 0;
  border-bottom: 1px solid var(--border); white-space: nowrap;
}
table.bench th.num, table.bench td.num { text-align: right; font-variant-numeric: tabular-nums; }
table.bench td { padding: 8px 12px 8px 0; border-bottom: 1px solid var(--border); }
table.bench tr:last-child td { border-bottom: 0; }
table.bench tr.is-model td { background: color-mix(in srgb, var(--accent) 9%, transparent); }
table.bench tr.is-model td:first-child { font-weight: 600; color: var(--ink); }
.bench-note { color: var(--muted); font-size: 12.5px; }
/* Predictors are grouped by what they are allowed to see, because a model
   given past PM2.5 and one given only weather are not answering the same
   question. Ranking them in one list would read as a verdict it isn't. */
table.bench td.bench-group {
  padding: 16px 0 6px; font-size: 11.5px; font-weight: 600;
  color: var(--ink2); border-bottom: 1px solid var(--border);
}
table.bench tr:first-child td.bench-group { padding-top: 2px; }
table.bench td.bench-group span { font-weight: 400; color: var(--muted); }
.verdict {
  display: flex; flex-wrap: wrap; gap: 10px 20px; margin: 14px 0 0;
  padding-top: 14px; border-top: 1px solid var(--border);
}
.verdict div { font-size: 13px; color: var(--ink2); }
.verdict b { display: block; font-size: 20px; margin-bottom: 1px; }

/* ---------- method section ---------- */
h2.method-h { margin: 36px 0 0; font-size: 23px; }
.method-sub { margin: 8px 0 0; color: var(--ink2); font-size: 14.5px; max-width: 84ch; }
/* Marks where the page stops being about the selected city. A rule rather
   than a heading alone, because the boundary is the information. */
.scope-rule { border: 0; border-top: 1px solid var(--border); margin: 40px 0 0; }
h2.scope-h { margin-top: 26px; }
.method-card { margin: 16px 0 0; }
.steps {
  list-style: none; margin: 12px 0 0; padding: 0; display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px;
}
.step {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 14px;
}
.step-n {
  font-size: 11px; font-weight: 700; color: var(--accent);

}
.step-t { font-size: 14.5px; font-weight: 600; margin-top: 3px; }
.step-d { font-size: 12.5px; color: var(--ink2); margin-top: 4px; line-height: 1.45; }
.why { margin: 14px 0 2px; font-size: 12.5px; color: var(--muted); max-width: 96ch; }
.method-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(430px, 1fr));
  gap: 18px; margin: 18px 0 0;
}
.spec {
  margin: 12px 0 2px; display: grid; grid-template-columns: max-content 1fr;
  gap: 8px 18px; font-size: 13px; align-items: baseline;
}
.spec dt { color: var(--muted); white-space: nowrap; }
.spec dd { margin: 0; color: var(--ink); min-width: 0; }
.spec code {
  font-family: ui-monospace, SFMono-Regular, "Cascadia Mono", Menlo, monospace;
  font-size: 12.5px; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 3px; padding: 1px 5px;
}
.gloss { color: var(--muted); font-size: 12.5px; }
@media (max-width: 620px) { .method-grid { grid-template-columns: 1fr; } }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

footer { margin: 22px 0 44px; padding-top: 18px; border-top: 1px solid var(--border); }
.data-links { font-size: 13.5px; color: var(--ink2); }
.data-links strong { color: var(--ink); font-weight: 600; }
.foot-note { color: var(--muted); font-size: 12.5px; margin-top: 8px; }
#error { color: var(--crit); padding: 16px 0; font-size: 14px; }

@media (max-width: 620px) {
  header { flex-direction: row; padding-top: 26px; }
  h1 { font-size: 23px; }
  .charts { grid-template-columns: 1fr; }
  .segmented { width: 100%; }
  .segmented button { flex: 1; padding: 8px 6px; }
}