@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600&display=swap");

:root {
  --bg: #f7f8f4;
  --ink: #27343a;
  --copy: #536168;
  --muted: #879196;
  --guide: #96a6a5;
  --chalk: #55b9a5;
  --chalk-dark: #247a6c;
  --accent: #d67b5c;
  --blue: #153d91;
  --red: #d7172b;
}

* { box-sizing: border-box; }

html,
body,
.story-page {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: "IBM Plex Sans", sans-serif;
  background: var(--bg);
}

.story-page #quarto-header,
.story-page #title-block-header,
.story-page .nav-footer {
  display: none;
}

.story-page #quarto-content,
.story-page #quarto-document-content,
.story-page main.content,
.story-page .page-columns {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0;
}

.math-loader { display: none; }

#flag-story {
  position: fixed;
  inset: 0;
  overflow: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 12%, rgba(255, 255, 255, .98), transparent 35%),
    radial-gradient(circle at 76% 46%, rgba(255, 255, 255, .50), transparent 43%),
    repeating-linear-gradient(0deg, rgba(39, 52, 58, .010) 0 1px, transparent 1px 6px),
    var(--bg);
}

.story-loading {
  margin: 0;
  padding: 2rem 3rem;
  color: var(--muted);
}

.shell {
  height: 100%;
  display: grid;
  grid-template-columns: minmax(300px, 30%) minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr) auto;
  column-gap: clamp(20px, 3vw, 54px);
  padding: 18px clamp(22px, 3vw, 54px) 14px;
}

.head {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 24px;
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .105em;
  text-transform: uppercase;
}

.copy {
  align-self: center;
  max-width: 470px;
  padding: 20px 0 26px;
}

.step {
  margin: 0 0 11px;
  color: var(--chalk-dark);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .11em;
  text-transform: uppercase;
}

.copy h1 {
  max-width: 13ch;
  margin: 0 0 18px;
  color: #243037;
  font: 400 clamp(33px, 3.6vw, 57px) / .99 Georgia, serif;
  letter-spacing: -.035em;
}

.txt {
  max-width: 47ch;
  margin: 0;
  color: var(--copy);
  font-size: 15px;
  line-height: 1.62;
}

.note {
  max-width: 48ch;
  margin: 13px 0 0;
  color: #7c878c;
  font-size: 12.5px;
  line-height: 1.48;
}

.formula {
  min-height: 46px;
  margin-top: 20px;
  padding: 10px 0 10px 14px;
  border-left: 2px solid rgba(36, 122, 108, .55);
  color: #37474e;
  font-size: 15px;
  line-height: 1.35;
}

.formula:empty { display: none; }
.formula mjx-container { margin: 0 !important; }

.graphic {
  min-width: 0;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.graphic svg {
  width: 100%;
  height: 100%;
  max-height: 79vh;
  overflow: visible;
}

.geo {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
  transition: opacity .38s ease, stroke .38s ease, stroke-width .38s ease;
}

.main {
  stroke: #405057;
  stroke-width: 1.75;
}

.guide {
  stroke: var(--guide);
  stroke-width: 1.15;
  stroke-dasharray: 5 7;
}

.compass {
  stroke: #72b8aa;
  stroke-width: 1.15;
  stroke-dasharray: 4 6;
}

.star-line {
  stroke: #34454b;
  stroke-width: 2;
}

.dimension {
  stroke: #64777b;
  stroke-width: 1.15;
  stroke-dasharray: 3 4;
}

.geo.off { opacity: 0; }

.geo.on.main:not(.hot) { opacity: .30; }

.geo.on.guide:not(.hot),
.geo.on.compass:not(.hot),
.geo.on.dimension:not(.hot) {
  opacity: .11;
}

.geo.on.star-line:not(.hot) { opacity: .62; }

.geo.hot {
  opacity: 1;
  stroke: var(--chalk-dark);
  stroke-width: 2.35;
}

.geo.hot.accent { stroke: var(--accent); }

.pt {
  fill: var(--bg);
  stroke: #4d6067;
  stroke-width: 1.35;
  opacity: 0;
  transition: opacity .35s ease, fill .35s ease, stroke .35s ease;
}

.pt.on { opacity: .42; }

.pt.hot {
  opacity: 1;
  fill: var(--chalk);
  stroke: var(--chalk-dark);
}

.m-label {
  opacity: 0;
  pointer-events: none;
  overflow: visible;
  transition: opacity .35s ease;
}

.m-label.on { opacity: .50; }
.m-label.hot { opacity: 1; }

.m-label > div {
  width: max-content;
  color: #526168;
  font-size: 14px;
  line-height: 1;
  white-space: nowrap;
}

.m-label.hot > div { color: #1d6f62; }
.m-label.accent > div { color: var(--accent); }
.m-label mjx-container { margin: 0 !important; }

.flag-fill {
  opacity: 0;
  transition: opacity .75s ease;
}

.flag-fill.on { opacity: .93; }
.flag-fill.blue { fill: var(--blue); }
.flag-fill.white { fill: #fff; stroke: rgba(39, 52, 58, .10); stroke-width: 1; }
.flag-fill.red { fill: var(--red); }
.flag-fill.star-white { fill: #fff; }

.nav {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 42px;
}

.nav button {
  display: grid;
  place-items: center;
  width: 33px;
  height: 33px;
  padding: 0;
  border: 1px solid rgba(39, 52, 58, .14);
  border-radius: 50%;
  color: #56666d;
  background: rgba(255, 255, 255, .28);
  font: inherit;
  cursor: pointer;
}

.nav button:hover,
.nav button:focus-visible {
  border-color: rgba(36, 122, 108, .45);
  outline: none;
}

.nav button:disabled {
  opacity: .22;
  cursor: default;
}

.dots {
  display: flex;
  gap: 5px;
  align-items: center;
}

.dots button {
  width: 6px;
  min-width: 6px;
  height: 6px;
  padding: 0;
  border: 0;
  background: rgba(66, 80, 86, .20);
}

.dots button.cur {
  background: var(--chalk-dark);
  transform: scale(1.38);
}

.count {
  min-width: 44px;
  color: var(--muted);
  font-size: 10.5px;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 980px) {
  html,
  body,
  .story-page {
    overflow: auto;
  }

  #flag-story {
    position: relative;
    min-height: 100vh;
    overflow: auto;
  }

  .shell {
    min-height: 100vh;
    height: auto;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto minmax(430px, 1fr) auto;
    padding: 14px 18px 10px;
  }

  .copy {
    max-width: 760px;
    padding: 22px 0 8px;
  }

  .copy h1 {
    max-width: 17ch;
    font-size: 40px;
  }

  .graphic { min-height: 430px; }
  .source { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}