/* One ink, one paper. Everything else is opacity and line weight. */
:root {
  --paper: #f6f5f0;
  --ink: #1f2c78;        /* синий */
  --ink-2: rgba(31, 44, 120, .8);
  --ink-3: rgba(31, 44, 120, .45);
  --hair: rgba(31, 44, 120, .16);
  --serif: 'Newsreader', 'Iowan Old Style', Georgia, serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  color-scheme: light;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; }
body {
  -webkit-user-select: none; user-select: none;   /* dragging the cloud shouldn't select text */
  background: var(--paper);
  color: var(--ink);
  font: 400 19px/1.5 var(--serif);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; color: inherit; }

#stage { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

/* ---- the sentence bar ---- */
.top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 3;
  display: grid; grid-template-columns: 1fr minmax(0, auto) 1fr; align-items: baseline; gap: 10px 28px;
  padding: 20px 36px 14px;
  background: linear-gradient(var(--paper) 70%, transparent);
}
.top .tools { justify-self: end; }
.mark {
  font: italic 400 28px/1 var(--serif); color: var(--ink);
  text-decoration: none; letter-spacing: -.01em; white-space: nowrap;
}
.sentence { margin: 0; font: 400 24px/1.6 var(--serif); text-align: center; max-width: 980px; }
.sentence .w { color: var(--ink-2); margin: 0 .28em; }
.sentence .w:first-child { margin-left: 0; }
.pick {
  all: unset; cursor: pointer; color: var(--ink); font-style: italic;
  border-bottom: 1.5px solid var(--ink-3); padding: 0 .1em;
  transition: border-color .2s;
}
.pick:hover, .pick[aria-expanded="true"] { border-color: var(--ink); }
.pick:focus-visible, .info:focus-visible, .tool:focus-visible, .pop button:focus-visible {
  outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 2px;
}
.pick .caret { font: 400 .55em/1 var(--mono); margin-left: .3em; vertical-align: .35em; color: var(--ink-2); font-style: normal; }
.info { all: unset; cursor: pointer; font: 400 .7em/1 var(--mono); color: var(--ink-2); margin-left: .25em; vertical-align: .3em; }
.info:hover { color: var(--ink); }

.tools { display: flex; gap: 8px; }
.tool {
  all: unset; cursor: pointer; font: 400 14px/1 var(--mono); color: var(--ink-2);
  padding: 7px 11px; border: 1px solid var(--ink-3); border-radius: 999px;
}
.tool:hover { color: var(--ink); border-color: var(--ink); }
.tool[aria-pressed="true"] { color: var(--paper); background: var(--ink); border-color: var(--ink); }

/* ---- popover lists ---- */
.pop {
  position: fixed; z-index: 6; min-width: 220px; max-width: min(460px, calc(100vw - 16px));
  max-height: 60vh; overflow-y: auto;
  background: var(--paper); border: 1px solid var(--ink);
  box-shadow: 0 10px 30px -12px rgba(15, 20, 60, .35);
  padding: 6px 0;
}
.pop > button {
  all: unset; display: flex; align-items: baseline; justify-content: space-between; gap: 18px;
  width: 100%; box-sizing: border-box; cursor: pointer;
  padding: 8px 16px; font: 400 19px/1.3 var(--serif);
}
.pop > button small { font: 400 13px/1 var(--mono); color: var(--ink-2); white-space: nowrap; }
.pop > button:hover, .pop > button:focus { background: var(--hair); }
.pop > button[aria-selected="true"] span { border-bottom: 1.5px solid var(--ink); }
.about { padding: 8px 18px 10px; font-size: 17px; line-height: 1.45; -webkit-user-select: text; user-select: text; }
.about .src { margin: 0 0 12px; }
.about .src b { display: block; font: 500 15px/1.3 var(--mono); }
.about q { quotes: '“' '”'; color: var(--ink-2); }
.about a, .more a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--ink-3); }
.about .src a { font: 400 13px/1 var(--mono); margin-left: .3em; }
.about .here { font-style: italic; margin: 0 0 6px; }
.about h3 { font: 500 13px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); margin: 14px 0 8px; }
.about ol, .more ol { list-style: none; margin: 0; padding: 0; }
.about li, .more li { font-size: 15.5px; line-height: 1.4; margin: 0 0 .5em; }

/* ---- the figure caption: one quiet row, details folded away ---- */
.caption {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 2; margin: 0;
  padding: 14px 36px 10px;
  border-top: 1px solid var(--hair);
  background: var(--paper);
}
.cap-toggle {
  all: unset; cursor: pointer; position: absolute; top: 10px; right: 36px;
  font: 400 13px/1 var(--mono); color: var(--ink-3);
}
.cap-toggle:hover { color: var(--ink); }
.cap-row {
  display: flex; justify-content: center; align-items: center; gap: 48px;
  max-width: 1280px; margin: 0 auto; padding: 0 40px;
}
.cap-row > .eq { flex: 0 0 auto; max-width: 44vw; }
.cap-mid { flex: 0 1 540px; min-width: 0; }
.cap-out { flex: 0 0 auto; }
.eq { overflow-x: auto; overflow-y: hidden; }
.eq .katex-display { margin: 0; text-align: left; }
.eq .katex-display > .katex { text-align: left; }
.eq .katex { font-size: 1.15em; }
.eq-small .katex { font-size: 1em; }
.cap-title { margin: 0 0 2px; font: italic 400 17px/1.3 var(--serif); color: var(--ink-2); }
.legend { margin: 0; font-size: 18px; line-height: 1.4; }
.readout { display: grid; gap: 4px; }
.stat { display: flex; align-items: baseline; gap: 4px 10px; flex-wrap: wrap; }
.stat .k { font: 400 14px/1 var(--mono); color: var(--ink-2); }
.stat .v { font: 400 26px/1.1 var(--mono); letter-spacing: -.02em; }
.stat .t { font: italic 400 16px/1.2 var(--serif); color: var(--ink-2); }
.ctl { display: grid; grid-template-columns: auto minmax(120px, 1fr) auto auto; align-items: center; gap: 10px;
  font: 400 15px/1 var(--mono); color: var(--ink-2); margin: 8px 0 0; }
.ctl input[type=range] { width: 100%; accent-color: var(--ink); }
.more { margin: 8px auto 0; max-width: 1280px; text-align: center; }
.more summary { cursor: pointer; font: 400 13.5px/1 var(--mono); color: var(--ink-3); width: max-content; margin: 0 auto; }
.more summary:hover { color: var(--ink); }
.more[open] summary { color: var(--ink-2); }
.more-body {
  text-align: left; -webkit-user-select: text; user-select: text;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 40px;
  max-height: 30vh; overflow-y: auto; padding: 10px 0 4px;
}
.metric-note { margin: 6px 0 0; font-size: 16.5px; line-height: 1.4; color: var(--ink-2); }
.agree { color: var(--ink); }
.more h3 { font: 500 13px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); margin: 0 0 8px; }
.more h3 ~ h3 { margin-top: 14px; }
body.cap-hidden .cap-row, body.cap-hidden .more { display: none; }
body.cap-hidden .caption { padding: 8px 36px; border-top-color: transparent; background: transparent; }
body.cap-hidden .cap-toggle { position: static; }

/* ---- hover tip ---- */
.tip {
  position: fixed; pointer-events: none; z-index: 5;
  padding: 9px 12px 10px; max-width: 340px;
  background: var(--paper); border: 1px solid var(--ink);
  font: 400 15px/1.35 var(--serif); color: var(--ink);
}
.tip b { display: block; font: 500 20px/1.2 var(--serif); }
.tip span { font: 400 13.5px/1.4 var(--mono); color: var(--ink-2); }
.tip img { display: block; width: 112px; height: auto; max-height: 112px; object-fit: contain; image-rendering: pixelated; margin: 0 0 6px; }

/* ---- medium screens: caption in two columns ---- */
@media (max-width: 1180px) {
  .cap-row { flex-wrap: wrap; gap: 8px 32px; padding: 0; }
  .cap-row > .eq { flex-basis: 100%; display: flex; justify-content: center; }
  .top { grid-template-columns: auto minmax(0, 1fr) auto; }
}

/* ---- phones: sentence wraps on top, caption is a short collapsible strip ---- */
@media (max-width: 760px) {
  body { font-size: 16.5px; }
  .top { padding: 12px 14px 8px; gap: 4px 12px; display: flex; flex-wrap: wrap; }
  .sentence { text-align: left; }
  .cap-row { display: grid; grid-template-columns: minmax(0, 1fr); justify-content: stretch; }
  .cap-row > * { min-width: 0; }
  .cap-row > .eq { display: block; width: 100%; max-width: 100%; }
  .tip { max-width: calc(100vw - 16px); }
  .more { text-align: left; }
  .more summary { margin: 0; }
  .mark { font-size: 22px; }
  .sentence { font-size: 18px; line-height: 1.55; flex-basis: 100%; }
  .caption { padding: 10px 14px 8px; max-height: 42vh; overflow-y: auto; }
  .cap-toggle { right: 14px; }
  .cap-row { grid-template-columns: 1fr; gap: 6px; padding-right: 0; }
  .more-body { grid-template-columns: 1fr; gap: 12px; }
  .legend { font-size: 16px; }
  .eq .katex { font-size: 1em; }
}
.credit { margin: 12px 0 0; font: 400 13.5px/1.3 var(--mono); color: var(--ink-2); }