/* Earth Burns — dark editorial instrument.
   The map owns the frame; every control sits on it without boxing it in. */

:root {
  --ink: #0a0a0d;
  --ink-2: #14141b;
  --paper: #ece9e2;
  --muted: #8d8a95;
  --rule: rgba(236, 233, 226, 0.12);
  --ember: #e05233;
  --cool: #4f93d4;
  --gap: #f2b53c;
  --sans: ui-sans-serif, "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --gutter: clamp(1.1rem, 2.6vw, 2.75rem);
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  overflow: hidden;
}

#map {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}
#map:active { cursor: grabbing; }

/* ---------- masthead ---------- */

.masthead {
  position: fixed;
  top: var(--gutter);
  left: var(--gutter);
  max-width: min(30ch, 42vw);
  z-index: 3;
  pointer-events: none;
}

.masthead-title {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
}
/* The title itself stays click-through so it never blocks map dragging; the
   "?" opts back in, since it is the one interactive element up here. */
.masthead-title .about-help {
  pointer-events: auto;
  margin-top: 0.35rem;
}

.masthead h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2.6vw, 2.35rem);
  font-weight: 640;
  letter-spacing: -0.035em;
  line-height: 0.95;
  text-transform: uppercase;
}
.masthead h1 span {
  display: block;
  color: var(--ember);
}

.standfirst {
  margin: 0.85rem 0 0;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: 34ch;
}

.lang-switch {
  display: flex;
  gap: 0.7rem;
  margin-top: 0.9rem;
}
.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  pointer-events: auto;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.64rem;
  font-weight: 620;
  letter-spacing: 0.1em;
  cursor: pointer;
  position: relative;
  transition: color 160ms ease;
}
.lang-btn::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.22rem;
  height: 1px;
  width: 0;
  background: var(--ember);
  transition: width 220ms cubic-bezier(0.16, 1, 0.3, 1);
}
.lang-btn:hover { color: var(--paper); }
.lang-btn.is-on { color: var(--paper); }
.lang-btn.is-on::after { width: 100%; }
.lang-btn:focus-visible { outline: 1px solid var(--ember); outline-offset: 3px; }

/* ---------- mode switches ---------- */

.modes {
  position: fixed;
  top: var(--gutter);
  right: var(--gutter);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
}

.mode-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.mode-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 560;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  padding: 0.42rem 0 0.42rem 1.1rem;
  cursor: pointer;
  position: relative;
  transition: color 160ms ease;
}
.mode-btn::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0.18rem;
  height: 1px;
  width: 0;
  background: var(--ember);
  transition: width 220ms cubic-bezier(0.16, 1, 0.3, 1);
}
.mode-btn:hover { color: var(--paper); }
.mode-btn.is-on { color: var(--paper); }
.mode-btn.is-on::after { width: 100%; }
.mode-btn:focus-visible { outline: 1px solid var(--ember); outline-offset: 3px; }

/* "The human fingerprint" is the payoff the other three modes exist to
   explain, so it gets its own larger row at the top of the nav rather than a
   tint that only read clearly once you already knew to look for it. */
.mode-row--featured .mode-btn {
  font-size: 0.98rem;
  font-weight: 640;
  padding-top: 0.15rem;
}
.mode-row--featured .help-dot { margin-top: 0.12rem; }

.modes-secondary-label {
  margin: 0.85rem 0 0.3rem;
  font-size: 0.56rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0.72;
  text-align: right;
}

.modes-secondary {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
/* Visibly the annex to "The human fingerprint" above: a step down in size
   from the nav's own default, not just a lack of the featured row's emphasis. */
.modes-secondary .mode-btn { font-size: 0.64rem; }

/* Shared look for every "?" trigger: a small outlined dot. .mode-help is
   conditional (only the active mode's row shows one); .about-help is the
   general one in the masthead and stays visible all the time. */
.help-dot {
  appearance: none;
  width: 1.05rem;
  height: 1.05rem;
  flex: none;
  border-radius: 50%;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.58rem;
  font-weight: 640;
  line-height: 1;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: color 160ms ease, border-color 160ms ease;
}
.help-dot:hover { color: var(--paper); border-color: var(--ember); }
.help-dot:focus-visible { outline: 1px solid var(--ember); outline-offset: 2px; }

/* The per-mode "?" only exists next to the mode currently selected: it
   follows the active row instead of cluttering the other three. */
.mode-help { display: none; }
.mode-help.is-on { display: inline-flex; }

.about-help { display: inline-flex; }

/* ---------- readout ---------- */

.readout {
  position: fixed;
  left: var(--gutter);
  bottom: calc(var(--gutter) + 2.8rem);
  z-index: 3;
  pointer-events: none;
}

.stamp {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.stamp #year { color: var(--paper); }

.figures {
  display: flex;
  align-items: baseline;
  gap: clamp(1.1rem, 3vw, 2.6rem);
}

.figure { display: flex; flex-direction: column; gap: 0.15rem; }

.figure-label {
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.figure-value {
  font-family: var(--mono);
  font-size: clamp(1.6rem, 3.6vw, 2.9rem);
  font-weight: 600;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.035em;
}

.figure[data-world="observed"] .figure-value { color: var(--ember); }
.figure[data-world="counterfactual"] .figure-value { color: var(--cool); }
.figure--gap .figure-value { color: var(--gap); font-size: clamp(1.1rem, 2.2vw, 1.7rem); }
.figure--gap { align-self: center; }

.caption {
  margin: 0.6rem 0 0;
  font-size: 0.66rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* "The numbers", "Read the study" and "Get the data" as one row: the two
   citation links used to live only inside modals, two clicks deep, which is
   not really credit if a visitor never finds them. Here they cost one.
   Its own fixed block on the right, not the last line of .readout: buried
   under the stamp and the two big figures it read as a footnote nobody
   reached. Mirroring the nav's right edge gives it a corner of its own. */
.credits-row {
  position: fixed;
  right: var(--gutter);
  bottom: calc(var(--gutter) + 4.2rem);
  z-index: 3;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.5rem;
  pointer-events: auto;
}
.credits-sep { color: var(--rule); font-size: 0.62rem; }
.credits-links { display: inline-flex; align-items: center; gap: 0.5rem; }
.credits-links > a:not(:first-child) { margin-left: 0.5rem; }
.credits-links > a:not(:first-child)::before {
  content: "\00B7";
  position: absolute;
  margin-left: -0.95rem;
  color: var(--rule);
}

.stats-trigger,
.credit-link {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 620;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  position: relative;
}
.stats-trigger::after,
.credit-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.2rem;
  height: 1px;
  width: 0;
  background: var(--ember);
  transition: width 220ms cubic-bezier(0.16, 1, 0.3, 1);
}
.stats-trigger:hover, .credit-link:hover { color: var(--paper); }
.stats-trigger:hover::after, .credit-link:hover::after { width: 100%; }
.credit-link:focus-visible { outline: 1px solid var(--ember); outline-offset: 3px; }
.stats-trigger:focus-visible { outline: 1px solid var(--ember); outline-offset: 3px; }

/* ---------- transport ---------- */

.transport {
  position: fixed;
  left: var(--gutter);
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 3;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--rule);
}

.play {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--paper);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
}
.play svg { width: 0.72rem; height: 0.72rem; fill: currentColor; }
.play:hover { border-color: var(--ember); background: rgba(224, 82, 51, 0.12); }
.play:focus-visible { outline: 1px solid var(--ember); outline-offset: 3px; }

.scrub { position: relative; }

.scrub input[type="range"] {
  appearance: none;
  width: 100%;
  height: 1.5rem;
  background: transparent;
  cursor: pointer;
  margin: 0;
  display: block;
}
.scrub input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--rule);
}
.scrub input[type="range"]::-moz-range-track { height: 2px; background: var(--rule); }
.scrub input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 3px;
  height: 1.15rem;
  margin-top: -0.53rem;
  background: var(--ember);
  border: 0;
  border-radius: 0;
}
.scrub input[type="range"]::-moz-range-thumb {
  width: 3px; height: 1.15rem; background: var(--ember); border: 0; border-radius: 0;
}
.scrub input[type="range"]:focus-visible { outline: 1px solid var(--ember); outline-offset: 2px; }

.ticks {
  position: absolute;
  left: 0;
  right: 0;
  top: 1.45rem;
  height: 0.85rem;
  pointer-events: none;
}
.ticks span {
  position: absolute;
  transform: translateX(-50%);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.ticks span::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -0.42rem;
  width: 1px;
  height: 0.28rem;
  background: var(--rule);
}

.legend { display: flex; align-items: center; gap: 0.55rem; }
.legend-label {
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}
.legend-bar {
  width: clamp(4rem, 9vw, 8rem);
  height: 4px;
  background: linear-gradient(90deg, #252430, #5c1219, #c72910, #f87b0f, #ffd45a, #fffaea);
}
.legend.is-diverging .legend-bar {
  background: linear-gradient(90deg, #4f93d4, #1b3350, #252430, #6d1d12, #ef4023, #ffe28c);
}

/* ---------- loading a decade ---------- */

.loading {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 4;
  padding: 0.5rem 0.95rem;
  background: rgba(10, 10, 13, 0.82);
  border: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  pointer-events: none;
  animation: pulse 1.6s ease-in-out infinite;
}

/* ---------- twin view ---------- */

.twin-labels { display: none; }
body.is-twin .twin-labels { display: block; }

.twin-label {
  position: fixed;
  right: var(--gutter);
  z-index: 3;
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  pointer-events: none;
}
.twin-label--top { top: calc(50% - 1.9rem); color: var(--ember); }
.twin-label--bottom { bottom: calc(var(--gutter) + 5.6rem); color: var(--cool); }

body.is-twin .standfirst { display: none; }
body.is-twin .caption { display: none; }
body.is-twin .figure-value { font-size: clamp(1.25rem, 2.4vw, 1.9rem); }
body.is-twin .figures { gap: clamp(0.9rem, 2vw, 1.7rem); }

body.is-twin::after {
  content: "";
  position: fixed;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--rule);
  z-index: 2;
}

/* ---------- help modal ---------- */

/* A native <dialog>: Escape and focus-trapping come for free. It is sized to
   the full viewport so a click landing on its own box (outside .help-card)
   counts as "outside" and light-dismisses it; ::backdrop carries the tint. */
dialog.help-modal {
  display: none;
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  max-width: 100vw;
  max-height: 100vh;
  border: 0;
  background: transparent;
}
dialog.help-modal[open] {
  display: flex;
  align-items: center;
  justify-content: center;
}
dialog.help-modal::backdrop {
  background: rgba(6, 6, 9, 0.5);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.help-card {
  position: relative;
  max-width: min(28rem, 86vw);
  padding: 1.6rem 1.9rem;
  background: rgba(20, 20, 27, 0.74);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--ember);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.help-card h2 {
  margin: 0 0 0.65rem;
  font-size: 0.95rem;
  font-weight: 640;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--paper);
}

.help-card p {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--paper);
  opacity: 0.88;
}

/* The general "about" card holds several short facts instead of one
   paragraph, so it gets a little more room and a definition-list layout. */
.about-card {
  max-width: min(30rem, 88vw);
  max-height: 84vh;
  overflow-y: auto;
  /* Firefox: a thin, dark thumb instead of the OS default. Chrome/Safari/Edge
     read the ::-webkit-scrollbar rules below instead of this shorthand. */
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}
.about-card::-webkit-scrollbar { width: 8px; }
.about-card::-webkit-scrollbar-track { background: transparent; }
.about-card::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 4px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.about-card::-webkit-scrollbar-thumb:hover { background: var(--muted); background-clip: padding-box; }
.about-card::-webkit-scrollbar-button { display: none; height: 0; width: 0; }

/* Wider than .about-card: a two-column grid of big numbers needs the room a
   single column of prose does not. Same thin scrollbar treatment. */
.stats-card {
  max-width: min(34rem, 92vw);
  max-height: 84vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}
.stats-card::-webkit-scrollbar { width: 8px; }
.stats-card::-webkit-scrollbar-track { background: transparent; }
.stats-card::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 4px;
  border: 2px solid transparent;
  background-clip: padding-box;
}
.stats-card::-webkit-scrollbar-thumb:hover { background: var(--muted); background-clip: padding-box; }
.stats-card::-webkit-scrollbar-button { display: none; height: 0; width: 0; }

.stats-note {
  margin: 0 0 1.1rem;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--muted);
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.3rem 1.5rem;
}
.stat-item { display: flex; flex-direction: column; gap: 0.2rem; }
.stat-value {
  font-family: var(--mono);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  font-weight: 640;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ember);
}
.stat-caption {
  font-size: 0.74rem;
  line-height: 1.4;
  color: var(--paper);
  opacity: 0.85;
}
/* An odd count leaves one card alone on its row: let it stretch, rather than
   sit stranded at one column's width next to empty space. */
.stats-grid > .stat-item:last-child:nth-child(odd) { grid-column: 1 / -1; }

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .stats-grid > .stat-item:last-child:nth-child(odd) { grid-column: auto; }
}

.about-facts {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.about-facts > div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.about-facts dt {
  margin: 0;
  font-size: 0.62rem;
  font-weight: 640;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ember);
}
.about-facts dd {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--paper);
  opacity: 0.88;
}

/* Credit for the underlying research: a visible, clickable pair of links
   rather than a citation buried in prose. */
.about-links {
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.3rem;
}
.about-link {
  font-size: 0.72rem;
  font-weight: 560;
  letter-spacing: 0.02em;
  color: var(--paper);
  opacity: 0.85;
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: opacity 160ms ease, border-color 160ms ease;
}
.about-link:hover { opacity: 1; border-color: var(--ember); }
.about-link:focus-visible { outline: 1px solid var(--ember); outline-offset: 3px; }

.help-close {
  position: absolute;
  top: 0.55rem;
  right: 0.65rem;
  width: 1.6rem;
  height: 1.6rem;
  display: grid;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
}
.help-close:hover { color: var(--paper); }
.help-close:focus-visible { outline: 1px solid var(--ember); outline-offset: 2px; }

/* ---------- boot and errors ---------- */

.boot {
  position: fixed;
  inset: 0;
  z-index: 6;
  display: grid;
  place-items: center;
  background: var(--ink);
  transition: opacity 500ms ease;
}
.boot.is-done { opacity: 0; pointer-events: none; }
.boot-text {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
  animation: pulse 1.9s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }

.error {
  position: fixed;
  inset: auto var(--gutter) var(--gutter) var(--gutter);
  z-index: 7;
  padding: 0.9rem 1.1rem;
  background: var(--ink-2);
  border-left: 2px solid var(--ember);
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--paper);
}

@media (max-width: 720px) {
  .masthead { max-width: 62vw; }
  .standfirst { display: none; }
  .transport { grid-template-columns: auto 1fr; }
  .legend { display: none; }
  /* The map is 2.055:1, so on a tall screen it occupies a band across the middle.
     The readout sits directly under that band instead of at the very bottom, which
     would leave a hole the height of a phone between the two. */
  .readout { top: 62%; bottom: auto; }
  .modes { flex-direction: column; align-items: flex-end; max-width: 60vw; }
  .mode-btn { padding-left: 0; }
  .mode-row--featured .mode-btn { font-size: 0.82rem; }
  .modes-secondary { flex-direction: row; flex-wrap: wrap; gap: 0 0.8rem; justify-content: flex-end; }
}

@media (max-width: 720px) and (orientation: landscape) {
  .readout { top: auto; bottom: calc(var(--gutter) + 4.6rem); }
}

@media (prefers-reduced-motion: reduce) {
  .boot-text { animation: none; opacity: 0.7; }
  * { transition-duration: 1ms !important; }
}