/* World Demographics Map — application shell.
   Palette follows the project's data-viz tokens (see js/palette.js); both themes
   are explicitly selected rather than auto-inverted. */

:root {
  color-scheme: light;
  --surface-1: #fcfcfb;
  --surface-2: #f9f9f7;
  --surface-sunken: #f0efec;
  --ink-primary: #0b0b0b;
  --ink-secondary: #52514e;
  --ink-muted: #898781;
  --hairline: #e1e0d9;
  --axis: #c3c2b7;
  --border-ring: rgba(11, 11, 11, 0.10);
  --shadow: 0 1px 2px rgba(11,11,11,.06), 0 8px 24px rgba(11,11,11,.08);

  --accent: #2a78d6;
  --accent-ink: #ffffff;
  --status-good: #0ca30c;
  --status-warning: #fab219;
  --status-serious: #ec835a;
  --status-critical: #d03b3b;

  --water: #dfe6ee;
  --land-base: #eceae4;
  --boundary: #b9b7ae;

  --radius: 10px;
  --radius-sm: 6px;
  --sidebar-w: 400px;
  --filters-w: 330px;
  /* Measured from the topbar at startup; this is only the value used before
     the first measurement lands. */
  --topbar-h: 52px;
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface-1: #1a1a19;
    --surface-2: #0d0d0d;
    --surface-sunken: #232322;
    --ink-primary: #ffffff;
    --ink-secondary: #c3c2b7;
    --ink-muted: #898781;
    --hairline: #2c2c2a;
    --axis: #383835;
    --border-ring: rgba(255, 255, 255, 0.10);
    --shadow: 0 1px 2px rgba(0,0,0,.5), 0 8px 24px rgba(0,0,0,.45);
    --accent: #3987e5;
    --water: #12171d;
    --land-base: #26262a;
    --boundary: #4a4a48;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-1: #1a1a19;
  --surface-2: #0d0d0d;
  --surface-sunken: #232322;
  --ink-primary: #ffffff;
  --ink-secondary: #c3c2b7;
  --ink-muted: #898781;
  --hairline: #2c2c2a;
  --axis: #383835;
  --border-ring: rgba(255, 255, 255, 0.10);
  --shadow: 0 1px 2px rgba(0,0,0,.5), 0 8px 24px rgba(0,0,0,.45);
  --accent: #3987e5;
  --water: #12171d;
  --land-base: #26262a;
  --boundary: #4a4a48;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; height: 100%;
  font-family: var(--font);
  background: var(--surface-2);
  color: var(--ink-primary);
  -webkit-text-size-adjust: 100%;
}

/* Filters on the left, map in the middle, the selected place on the right.
   The left column is zero-width rather than absent when the panel is hidden,
   so showing it is a column resize the map can follow rather than a reflow of
   the whole grid. */
#app {
  display: grid;
  grid-template-columns: 0 1fr var(--sidebar-w);
  grid-template-rows: auto 1fr;
  grid-template-areas: "top top top" "filters map side";
  height: 100vh; height: 100dvh;
}
#app.filters-open { grid-template-columns: var(--filters-w) 1fr var(--sidebar-w); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink);
  padding: .6rem 1rem; border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

/* ---------------------------------------------------------------- topbar */

#topbar {
  grid-area: top;
  display: flex; align-items: center; gap: 1rem;
  padding: .55rem .9rem;
  background: var(--surface-1);
  border-bottom: 1px solid var(--hairline);
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: .55rem; min-width: 0; }
.brand-mark { font-size: 1.35rem; line-height: 1; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.brand-text strong { font-size: .95rem; letter-spacing: -.01em; }
.brand-sub { font-size: .7rem; color: var(--ink-muted); white-space: nowrap; }

.search { position: relative; flex: 1 1 auto; max-width: 560px; margin-inline: auto; }
.search input {
  width: 100%; padding: .5rem .8rem;
  font: inherit; font-size: .875rem;
  color: var(--ink-primary);
  background: var(--surface-sunken);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
}
.search input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

#search-results {
  position: absolute; inset-inline: 0; top: calc(100% + 6px);
  margin: 0; padding: .25rem; list-style: none;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-height: min(60vh, 460px); overflow-y: auto; z-index: 40;
}
#search-results li {
  display: flex; align-items: baseline; gap: .5rem;
  padding: .45rem .6rem; border-radius: var(--radius-sm); cursor: pointer;
  font-size: .85rem;
}
#search-results li[aria-selected="true"], #search-results li:hover { background: var(--surface-sunken); }
#search-results .r-name { font-weight: 600; }
#search-results .r-context { color: var(--ink-muted); font-size: .75rem; margin-left: auto; }
#search-results .r-level {
  font-size: .65rem; text-transform: uppercase; letter-spacing: .04em;
  color: var(--ink-secondary); background: var(--surface-sunken);
  border: 1px solid var(--hairline); border-radius: 999px; padding: .05rem .4rem;
}
/* A group result does something different from a place result -- it shades the
   map instead of moving it -- so its chip is the accent colour rather than the
   neutral one, and the row says so in its context line. */
#search-results .r-group {
  color: var(--accent-ink); background: var(--accent);
  border-color: transparent;
}
#search-results .r-empty { color: var(--ink-muted); cursor: default; }

.topbar-actions { display: flex; gap: .4rem; align-items: center; }

.ghost-button {
  font: inherit; font-size: .8rem;
  color: var(--ink-secondary);
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: .38rem .6rem; cursor: pointer;
}
.ghost-button:hover { background: var(--surface-sunken); color: var(--ink-primary); }
.ghost-button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* --------------------------------------------------------- filters panel */

#filters {
  grid-area: filters;
  background: var(--surface-1);
  border-right: 1px solid var(--hairline);
  overflow-y: auto; overscroll-behavior: contain;
  z-index: 16; min-width: 0;
  padding: 0 .9rem 2rem;
}
#filters:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

.filters-head {
  display: flex; align-items: center; gap: .5rem;
  position: sticky; top: 0; z-index: 2;
  background: var(--surface-1);
  padding: .8rem 0 .5rem;
  border-bottom: 1px solid var(--hairline);
}
.filters-head h2 { margin: 0; font-size: .9rem; letter-spacing: -.01em; }
.filters-head button { margin-left: auto; }

/* The current filter, as chips. Repeated on the map itself when the panel is
   hidden, which is why it is styled here rather than inside #filters. */
.filter-summary {
  display: flex; flex-wrap: wrap; gap: .3rem;
  margin: .6rem 0 0;
}
.fchip {
  font-size: .68rem; line-height: 1.5;
  padding: .1rem .45rem; border-radius: 999px;
  color: var(--ink-secondary); background: var(--surface-sunken);
  border: 1px solid var(--hairline);
}
.fchip-key {
  color: var(--accent-ink); background: var(--accent); border-color: transparent;
  font-weight: 600;
}

.filter-section { margin-top: 1.1rem; }
.filter-section > h3 {
  margin: 0 0 .4rem; font-size: .68rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .06em; color: var(--ink-muted);
}

/* One choice per row, with room for the sentence that says what it does. The
   <select> this replaced had room for neither. */
.option-list { display: grid; gap: .2rem; }
.opt {
  display: grid; gap: .1rem; text-align: left;
  font: inherit; cursor: pointer;
  padding: .4rem .5rem;
  color: var(--ink-secondary);
  background: transparent;
  border: 1px solid transparent; border-radius: var(--radius-sm);
}
.opt:hover { background: var(--surface-sunken); }
.opt:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.opt[aria-checked="true"] {
  background: var(--surface-sunken);
  border-color: var(--accent);
  color: var(--ink-primary);
}
.opt .opt-name { font-size: .82rem; font-weight: 600; }
.opt[aria-checked="true"] .opt-name { color: var(--accent); }
/* The sentence under a choice explains the one you are on, not the five you
   are not. Six of them at once ran the list to 300px and pushed the legend --
   the thing that says what the colours mean -- below the fold on a laptop.
   Hovering brings a hint back for the option under the pointer, so the list
   is still browsable without choosing. */
.opt .opt-hint {
  font-size: .69rem; color: var(--ink-muted); line-height: 1.4; display: none;
}
.opt[aria-checked="true"] .opt-hint, .opt:hover .opt-hint,
.opt:focus-visible .opt-hint { display: block; }

/* Three mutually exclusive fields read better side by side than stacked: they
   are alternatives of one kind, not a menu of different things. */
.segmented { display: flex; gap: 2px; padding: 2px; background: var(--surface-sunken);
             border: 1px solid var(--hairline); border-radius: var(--radius-sm); }
.seg {
  flex: 1; min-width: 0; font: inherit; font-size: .76rem; cursor: pointer;
  padding: .3rem .2rem; border: none; border-radius: 4px;
  background: transparent; color: var(--ink-secondary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.seg:hover { color: var(--ink-primary); }
.seg:focus-visible { outline: 2px solid var(--accent); outline-offset: -1px; }
.seg[aria-checked="true"] {
  background: var(--surface-1); color: var(--ink-primary); font-weight: 600;
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
}

.group-search input {
  width: 100%; font: inherit; font-size: .8rem; padding: .35rem .5rem;
  color: var(--ink-primary); background: var(--surface-sunken);
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
}
.group-search input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.group-search input::placeholder { color: var(--ink-muted); }

.group-list {
  display: grid; gap: .1rem;
  max-height: min(46vh, 380px); overflow-y: auto; overscroll-behavior: contain;
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  padding: .2rem;
}
/* A row is the twist and the choice side by side. Indenting the row rather
   than the button keeps the whole hit area aligned with its level, so a child
   never looks like it starts where its parent's label does. */
.g-row {
  display: grid; grid-template-columns: 1.1rem 1fr; align-items: start;
  padding-left: calc(var(--g-depth, 0) * .85rem);
}
.g-twist {
  font: inherit; font-size: .7rem; line-height: 1.9;
  cursor: pointer; padding: 0; color: var(--ink-muted);
  background: transparent; border: none; border-radius: 3px;
}
.g-twist:hover { color: var(--ink-primary); background: var(--surface-sunken); }
.g-twist:focus-visible { outline: 2px solid var(--accent); outline-offset: -1px; }
.g-twist-empty { cursor: default; }

.g-opt {
  display: grid; gap: .05rem; text-align: left; min-width: 0;
  grid-template-columns: auto 1fr; grid-template-areas: "swatch name" ". reach" ". parent";
  font: inherit; cursor: pointer;
  padding: .32rem .45rem;
  background: transparent; color: var(--ink-secondary);
  border: 1px solid transparent; border-radius: 4px;
}
.g-name { grid-area: name; }
.g-reach { grid-area: reach; }
.g-parent { grid-area: parent; font-size: .66rem; color: var(--ink-muted); font-style: italic; }
/* The colour this group carries on the most-populous-group map, so the two
   controls are visibly the same vocabulary. */
.g-swatch {
  grid-area: swatch; width: .55rem; height: .55rem; margin: .28rem .4rem 0 0;
  border-radius: 2px; box-shadow: inset 0 0 0 1px var(--border-ring);
}
.g-swatch-none {
  /* The inline colour wins; this keeps the shape recognisable if the script
     that sets it has not run, and marks the dot as an outline rather than a
     fill so it reads as provisional. */
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.25);
}
.g-opt:hover { background: var(--surface-sunken); }
.g-opt:focus-visible { outline: 2px solid var(--accent); outline-offset: -1px; }
.g-opt[aria-selected="true"] {
  background: var(--surface-sunken); border-color: var(--accent); color: var(--ink-primary);
}
.g-name { font-size: .8rem; font-weight: 600; overflow-wrap: anywhere; }
.g-opt[aria-selected="true"] .g-name { color: var(--accent); }
.g-reach { font-size: .67rem; color: var(--ink-muted); font-variant-numeric: tabular-nums; }
/* The source labels folded into this entry. Clipped to one line: it is
   reassurance that "Christianity" also answers for the census that said
   "Catholic", not a list to read. The full set is spelled out in the reach
   note once the group is chosen. */
.g-labels {
  font-size: .66rem; color: var(--ink-muted); font-style: italic;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.group-divider {
  margin: .5rem 0 .25rem; padding: .35rem .45rem 0;
  border-top: 1px solid var(--hairline);
  display: grid; gap: .12rem;
}
.group-divider strong { font-size: .7rem; color: var(--ink-secondary); }
.group-divider span { font-size: .66rem; color: var(--ink-muted); line-height: 1.45; }

.group-empty { margin: .4rem .2rem; font-size: .72rem; color: var(--ink-muted); line-height: 1.5; }

.reach-labels { margin-top: .3rem; font-size: .68rem; color: var(--ink-muted); line-height: 1.5; }
.reach-labels > summary { cursor: pointer; }
.reach-labels > summary:hover { color: var(--ink-primary); }
.reach-labels > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

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

#map-wrap { grid-area: map; position: relative; min-width: 0; }
#map { position: absolute; inset: 0; background: var(--water); }

.map-legend {
  position: absolute; left: 12px; bottom: 12px; z-index: 10;
  width: min(280px, calc(100% - 24px));
  padding: .6rem .7rem;
  background: color-mix(in srgb, var(--surface-1) 92%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-ring);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.map-legend .filter-summary { margin: 0 0 .45rem; }
.control-note { margin: .5rem 0 0; font-size: .7rem; color: var(--ink-muted); line-height: 1.45; }
/* What the chosen filter covers. Sits at the foot of the panel because it
   qualifies the map that is already drawn, not the next thing the reader does. */
#group-reach { margin-top: .45rem; }
#group-count { margin-top: .35rem; }

/* The panel's legend and the on-map copy are the same markup in two places,
   so they share the rule rather than drifting apart in size. */
#legend, #map-legend-body {
  display: flex; flex-direction: column; gap: .28rem; font-size: .74rem;
}
.legend-scale { display: flex; height: 10px; border-radius: 3px; overflow: hidden; border: 1px solid var(--border-ring); }
.legend-scale span { flex: 1; }
.legend-ends { display: flex; justify-content: space-between; color: var(--ink-muted); font-size: .68rem; }
.legend-item { display: flex; align-items: center; gap: .45rem; color: var(--ink-secondary); }
.legend-swatch { width: 12px; height: 12px; border-radius: 3px; border: 1px solid var(--border-ring); flex: none; }
.legend-icon { font-size: .78rem; width: 1em; text-align: center; flex: none; }
/* The key to a hatched unit: the same two-tone diagonal the map draws, over
   the grey that stands for any group colour in the share ramp. */
.legend-swatch-hatched {
  background:
    repeating-linear-gradient(135deg, rgba(0,0,0,.55) 0 1.6px, rgba(255,255,255,.85) 1.6px 2.3px,
                              rgba(0,0,0,.55) 2.3px 3px, transparent 3px 6px),
    #6b6b6b;
}

/* A single on/off choice, laid out like the option rows around it so the
   panel keeps one rhythm: the name on the first line, the sentence under it. */
.check-row {
  display: grid; grid-template-columns: auto 1fr; column-gap: .5rem; align-items: center;
  padding: .4rem .5rem; border-radius: var(--radius-sm); cursor: pointer;
  color: var(--ink-secondary);
}
.check-row:hover { background: var(--surface-sunken); }
.check-row input { margin: 0; accent-color: var(--accent); }
.check-row input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.check-row .check-name { font-size: .82rem; font-weight: 600; color: var(--ink-primary); }
.check-row .check-hint { grid-column: 2; font-size: .69rem; color: var(--ink-muted); line-height: 1.4; }

.map-status {
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  z-index: 12; padding: .35rem .7rem; font-size: .75rem;
  background: var(--surface-1); color: var(--ink-secondary);
  border: 1px solid var(--hairline); border-radius: 999px; box-shadow: var(--shadow);
}

.maplibregl-popup-content {
  font-family: var(--font); font-size: .78rem; padding: .5rem .65rem;
  background: var(--surface-1); color: var(--ink-primary);
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.maplibregl-popup-tip { display: none; }
.tip-name { font-weight: 600; display: block; }
.tip-meta { color: var(--ink-muted); font-size: .72rem; }
.maplibregl-ctrl-attrib { font-size: .68rem; }

/* --------------------------------------------------------------- sidebar */

#sidebar {
  grid-area: side;
  background: var(--surface-1);
  border-left: 1px solid var(--hairline);
  overflow-y: auto; position: relative; z-index: 15;
}
.sidebar-close { position: absolute; top: .6rem; right: .6rem; display: none; }

#sidebar-body { padding: 1rem 1.1rem 3rem; }

.empty-state h2 { margin: .4rem 0 .5rem; font-size: 1rem; }
.empty-state p { font-size: .82rem; color: var(--ink-secondary); line-height: 1.55; }
.empty-note { color: var(--ink-muted) !important; font-size: .76rem !important; }

.entity-head { border-bottom: 1px solid var(--hairline); padding-bottom: .7rem; margin-bottom: .9rem; }
.entity-breadcrumb {
  font-size: .7rem; color: var(--ink-muted);
  text-transform: uppercase; letter-spacing: .05em; margin: 0 0 .25rem;
  display: flex; flex-wrap: wrap; gap: .3rem; align-items: center;
}
.entity-breadcrumb button {
  font: inherit; font-size: inherit; letter-spacing: inherit;
  background: none; border: none; padding: 0; cursor: pointer;
  color: var(--accent); text-decoration: underline; text-underline-offset: 2px;
}
.entity-name { margin: 0; font-size: 1.3rem; letter-spacing: -.02em; line-height: 1.15; }
.entity-sub { margin: .3rem 0 0; font-size: .76rem; color: var(--ink-muted); }

.facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: .5rem; margin-bottom: 1rem; }
.fact {
  background: var(--surface-sunken); border: 1px solid var(--border-ring);
  border-radius: var(--radius-sm); padding: .5rem .6rem; min-width: 0;
}
.fact-label { font-size: .66rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-muted); }
.fact-value { font-size: 1rem; font-weight: 600; margin-top: .15rem; overflow-wrap: break-word; hyphens: auto; }
.fact-value.is-gap { font-size: .78rem; font-weight: 500; color: var(--ink-muted); }
.fact-meta { font-size: .66rem; color: var(--ink-muted); margin-top: .15rem; }

.panel { margin-bottom: 1.15rem; }
.panel-head { display: flex; align-items: baseline; gap: .5rem; margin-bottom: .45rem; }
.panel-head h3 { margin: 0; font-size: .85rem; letter-spacing: -.01em; }
.panel-year { font-size: .68rem; color: var(--ink-muted); margin-left: auto; }

.stack-bar { display: flex; height: 16px; border-radius: 4px; overflow: hidden; gap: 2px; background: transparent; }
.stack-bar > span { display: block; min-width: 2px; }
.stack-bar > span:first-child { border-radius: 4px 0 0 4px; }
.stack-bar > span:last-child { border-radius: 0 4px 4px 0; }
/* The share of a population these categories do not describe. Hatched rather
   than a flat colour so it reads as absence and never as another group -- it
   has no swatch in the list below the bar and must not look like one. */
.stack-rest {
  background: repeating-linear-gradient(45deg,
    var(--hairline) 0 3px, transparent 3px 6px);
  box-shadow: inset 0 0 0 1px var(--hairline);
}

.composition-list { list-style: none; margin: .55rem 0 0; padding: 0; display: grid; gap: .3rem; }
.composition-list li { display: flex; align-items: center; gap: .45rem; font-size: .78rem; }
.composition-list .swatch { width: 10px; height: 10px; border-radius: 3px; flex: none; border: 1px solid var(--border-ring); }
.composition-list .label { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.composition-list .pct { margin-left: auto; font-variant-numeric: tabular-nums; color: var(--ink-secondary); }

.gap-note {
  display: flex; gap: .5rem; align-items: flex-start;
  font-size: .76rem; line-height: 1.5;
  padding: .55rem .65rem; border-radius: var(--radius-sm);
  background: var(--surface-sunken); border: 1px solid var(--border-ring);
  color: var(--ink-secondary);
}
.gap-note .gap-icon { flex: none; font-size: .9rem; line-height: 1.2; }
.gap-note strong { color: var(--ink-primary); }

.note { font-size: .72rem; color: var(--ink-muted); line-height: 1.5; margin: .45rem 0 0; }

.source-list { list-style: none; margin: .4rem 0 0; padding: 0; display: grid; gap: .35rem; }
.source-list li { font-size: .72rem; color: var(--ink-secondary); line-height: 1.45; }
.source-list a { color: var(--accent); }

.chip { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: .4rem; vertical-align: -1px; border: 1px solid var(--border-ring); }
.chip-present { background: var(--status-good); }
.chip-missing { background: var(--status-warning); }
.chip-notcollected { background: var(--status-serious); }

.children-list { list-style: none; margin: .4rem 0 0; padding: 0; display: grid; gap: .15rem; max-height: 260px; overflow-y: auto; }
.children-list button {
  width: 100%; text-align: left; font: inherit; font-size: .78rem;
  background: none; border: none; border-radius: var(--radius-sm);
  padding: .3rem .4rem; cursor: pointer; color: var(--ink-secondary);
  display: flex; gap: .5rem; align-items: baseline;
}
.children-list button:hover { background: var(--surface-sunken); color: var(--ink-primary); }
.children-list .c-count { margin-left: auto; font-size: .7rem; color: var(--ink-muted); font-variant-numeric: tabular-nums; }

.data-table { width: 100%; border-collapse: collapse; font-size: .74rem; margin-top: .5rem; }
.data-table th, .data-table td { text-align: left; padding: .25rem .3rem; border-bottom: 1px solid var(--hairline); }
.data-table td:last-child, .data-table th:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.data-table th { color: var(--ink-muted); font-weight: 600; font-size: .68rem; text-transform: uppercase; letter-spacing: .04em; }

details.table-toggle { margin-top: .5rem; }
details.table-toggle > summary { cursor: pointer; font-size: .72rem; color: var(--ink-muted); }
details.table-toggle > summary:hover { color: var(--ink-primary); }

/* ---------------------------------------------------------------- dialog */

dialog {
  max-width: 640px; width: calc(100% - 2rem); max-height: 84vh;
  padding: 0; border: 1px solid var(--hairline); border-radius: var(--radius);
  background: var(--surface-1); color: var(--ink-primary); box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(11,11,11,.45); }
dialog article { padding: 1rem 1.2rem 1.6rem; overflow-y: auto; max-height: 84vh; }
.dialog-head { display: flex; align-items: center; gap: 1rem; position: sticky; top: 0; background: var(--surface-1); padding-block: .3rem; }
.dialog-head h2 { margin: 0; font-size: 1.05rem; }
.dialog-head button { margin-left: auto; }
dialog h3 { font-size: .84rem; margin: 1.1rem 0 .3rem; }
dialog p, dialog li { font-size: .8rem; line-height: 1.6; color: var(--ink-secondary); }
.gap-key, .caveat-list { margin: .4rem 0; padding-left: 1.1rem; }
.gap-key { list-style: none; padding-left: 0; display: grid; gap: .4rem; }

/* --------------------------------------------------------------- responsive */

@media (max-width: 640px) {
  /* At phone widths the wordmark is the first thing to go: the search box is
     what people actually use, and it needs the row to itself. */
  #topbar { gap: .5rem; padding: .5rem .6rem; }
  .brand-text { display: none; }
  .search { max-width: none; margin-inline: 0; }
  .search input { font-size: 1rem; padding: .5rem .6rem; }
  #about-open { font-size: 0; padding: .38rem .5rem; }
  #about-open::before { content: "?"; font-size: .85rem; }
  #filters-toggle { font-size: 0; padding: .38rem .5rem; }
  #filters-toggle span { font-size: .85rem; }
  .map-legend { padding: .5rem .6rem; }
  /* The panel is the whole screen on a phone, so its controls get room to
     breathe rather than being squeezed to desktop proportions. */
  .opt { padding: .5rem .55rem; }
  .g-opt { padding: .42rem .5rem; }
  .group-search input { font-size: 1rem; }
  .group-list { max-height: 50vh; }
  .facts { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  #app, #app.filters-open { grid-template-columns: 1fr; grid-template-areas: "top" "map"; }
  /* Below this width there is no room for three columns, so the panel becomes
     a drawer over the map. It covers the topbar too -- its own ✕ and the
     Escape key are how it closes, and both return focus to the button that
     opened it. */
  #filters {
    position: fixed; inset: var(--topbar-h) auto 0 0; width: min(340px, 90vw);
    border-right: 1px solid var(--hairline);
    box-shadow: var(--shadow); z-index: 30;
  }
  #sidebar {
    position: fixed; inset: auto 0 0 0; height: min(62vh, 560px);
    border-left: none; border-top: 1px solid var(--hairline);
    border-radius: var(--radius) var(--radius) 0 0;
    box-shadow: var(--shadow);
    transform: translateY(100%); transition: transform .22s ease;
  }
  #sidebar.is-open { transform: translateY(0); }
  .sidebar-close { display: block; }
  .brand-sub { display: none; }
  .map-legend { bottom: 12px; width: calc(100% - 24px); }
  #sidebar:not(.is-open) { pointer-events: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}


/* ------------------------------------------------------------- info bubbles */

/* The "i" beside a heading. Small, quiet, and the same size as the heading it
   sits in, so it reads as punctuation rather than as another control. */
.info {
  display: inline-grid; place-items: center;
  width: 1.05em; height: 1.05em; margin-left: .35em; padding: 0;
  font: inherit; font-size: .95em; font-style: italic; font-weight: 700;
  line-height: 1; text-transform: none; cursor: help;
  color: var(--ink-muted); background: transparent;
  border: 1px solid var(--axis); border-radius: 50%;
}
.info:hover, .info[aria-expanded="true"] { color: var(--accent); border-color: var(--accent); }
.info:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.info-bubble {
  position: fixed; z-index: 60; max-width: min(30rem, calc(100vw - 1rem));
  padding: .55rem .7rem;
  font-size: .74rem; line-height: 1.5; color: var(--ink-primary);
  background: var(--surface-1);
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}

/* ------------------------------------------------- most-populous-group key */

.legend-groups { list-style: none; margin: 0 0 .5rem; padding: 0; display: grid; gap: .12rem; }
.legend-groups li {
  display: grid; grid-template-columns: auto 1fr auto; gap: .4rem; align-items: center;
  font-size: .74rem; color: var(--ink-secondary);
}
.legend-group-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.legend-group-count { font-size: .67rem; color: var(--ink-muted); font-variant-numeric: tabular-nums; }
.legend-more { font-size: .67rem; color: var(--ink-muted); font-style: italic; }
.legend-shade { display: grid; gap: .15rem; margin-top: .3rem; }
.legend-shade-label { font-size: .67rem; color: var(--ink-muted); }

/* The one fact from a composition note that changes how the bar is read, kept
   on the page while the rest of the note goes behind the "i". */
.basis-line { margin: .3rem 0 0; }
.chip-basis {
  display: inline-block; padding: .1rem .4rem;
  font-size: .66rem; font-weight: 600; letter-spacing: .01em;
  color: var(--ink-secondary); background: var(--surface-sunken);
  border: 1px solid var(--hairline); border-radius: 999px;
}
.chip-basis-partial { color: var(--status-serious); border-color: var(--status-serious); }
/* An estimate's badge sits before the one sentence that says what it is;
   the badge takes the status colour the map paints the unit in. */
.estimate-line { display: flex; gap: .45rem; align-items: baseline; font-size: .72rem;
  color: var(--ink-secondary); line-height: 1.45; }
.chip-estimate { flex: none; background: transparent; }

/* A heading that carries an "i" has to lay the two out on one line without the
   button inheriting the heading's letter-spacing. */
.filter-section > h3, .panel-head h3 { display: flex; align-items: center; }
.panel-head h3 .info { letter-spacing: 0; }

/* Same trade one size down, on the fact tiles. The label is uppercase with a
   .05em tracking, which would push the "i" off its own circle. */
.fact-label { display: flex; align-items: center; }
.fact-label .info { letter-spacing: 0; flex: none; }

/* The table view's total, which exists so a reader can see the column adds up
   rather than take it on trust. */
.data-table .total-row th {
  padding-top: .3rem; border-top: 1px solid var(--hairline);
  font-size: .7rem; color: var(--ink-secondary); text-align: left;
}
.data-table .total-row th:last-child { text-align: right; font-variant-numeric: tabular-nums; }

/* The shading scale, when it has been stretched to the range on screen.
   It is called out because a shade that means something different from one
   view to the next has to say so where the shade is explained. */
.legend-fitted {
  font-style: normal;
  font-size: 11px;
  color: var(--ink-muted);
  border: 1px solid var(--hairline);
  border-radius: 999px;
  padding: 0 5px;
  margin-left: 4px;
  white-space: nowrap;
}
.legend-fitted-note {
  margin: 4px 0 0;
  font-size: 11px;
  color: var(--ink-muted);
}