/*
 * Colours are sampled from the imagery itself: the plate black the composites
 * letterbox to, the #d62728 of their political boundaries, the #174e74 of
 * their graticule, and the yellow DEBRA paints dust with. The page is the
 * margin of the plate, so it stays out of the way of the picture.
 */

:root {
  --plate: #0b0b0b;
  --panel: #121316;
  --panel-high: #17191d;
  --rule: #23252a;
  --rule-bright: #33363d;
  --text: #e8e9ec;
  --muted: #8b909a;
  --dim: #61666f;
  --dust: #d9a441;
  --dust-dim: #6d5527;
  --boundary: #d62728;
  --graticule: #4d8ec4;

  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --gap: clamp(0.75rem, 2vw, 1.5rem);
  --plate-ratio: 1.5;
  --wipe: 50%;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--plate);
  color: var(--text);
  font-family: var(--display);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--graticule);
  text-decoration-color: color-mix(in srgb, var(--graticule) 40%, transparent);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--dust);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------- header */

.rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--gap);
  padding: 0.9rem var(--gap);
  border-bottom: 1px solid var(--rule);
  background: var(--panel);
}

.mark {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  text-decoration: none;
  color: inherit;
}

.mark-name {
  font-size: 1.15rem;
  font-variation-settings: "wdth" 118, "wght" 620;
  letter-spacing: 0.04em;
}

.mark-sub {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--dim);
}

.regions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.regions-empty {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--dim);
}

.region {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.32rem 0.7rem;
  border: 1px solid var(--rule-bright);
  background: transparent;
  color: var(--muted);
  font: inherit;
  text-align: start;
  cursor: pointer;
}

.region:hover {
  color: var(--text);
  border-color: var(--dim);
}

.region[aria-pressed="true"] {
  color: var(--plate);
  background: var(--dust);
  border-color: var(--dust);
}

.region-key {
  font-variation-settings: "wght" 600;
  letter-spacing: 0.05em;
  font-size: 0.86rem;
}

.region-where {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.8;
}

.freshness {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  align-items: center;
  gap: 0.45rem;
  width: 100%;
  order: 3;
}

.freshness::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dim);
}

.freshness[data-state="current"]::before {
  background: var(--dust);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--dust) 22%, transparent);
}

.freshness[data-state="late"]::before {
  background: var(--boundary);
}

@media (min-width: 900px) {
  .freshness {
    width: auto;
    order: 0;
    margin-inline-start: 0;
  }

  .regions {
    margin-inline-start: auto;
    order: 2;
  }
}

/* ----------------------------------------------------------------- stage */

.stage {
  display: grid;
  gap: var(--gap);
  padding: var(--gap);
  align-content: start;
}

@media (min-width: 1080px) {
  .stage {
    grid-template-columns: minmax(0, 1fr) 340px;
    align-items: start;
  }
}

.viewer {
  display: grid;
  gap: 0.75rem;
  min-width: 0;
}

.frame {
  position: relative;
  /* Height is budgeted first — the controls and the tape have to stay on
     screen — and the width follows the plate's own ratio from there, so the
     image fills the frame exactly and the wipe maps to real pixels. */
  aspect-ratio: var(--plate-ratio);
  width: min(100%, calc((100dvh - 17rem) * var(--plate-ratio)));
  margin-inline: auto;
  border: 1px solid var(--rule);
  background: var(--plate);
  overflow: hidden;
  touch-action: pan-y;
}

.layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.layer-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.layer-base,
.layer-image {
  object-fit: contain;
  display: block;
}

.layer-wipe {
  clip-path: inset(0 calc(100% - var(--wipe)) 0 0);
}

.frame[data-mode="debra"] .layer-wipe {
  clip-path: none;
}

.frame[data-mode="rgb"] .layer-wipe {
  display: none;
}

.frame[data-empty="true"] .layer {
  opacity: 0;
}

.tags[hidden] {
  display: none;
}

.tags {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  display: flex;
  justify-content: space-between;
  padding: 0.5rem;
  pointer-events: none;
}

.tag {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.15rem 0.4rem;
  background: color-mix(in srgb, var(--plate) 72%, transparent);
  color: var(--text);
  border: 1px solid var(--rule-bright);
}

.tag-left {
  border-color: var(--dust-dim);
  color: var(--dust);
}

.handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--wipe);
  width: 2px;
  margin-inline-start: -1px;
  background: color-mix(in srgb, var(--dust) 80%, white);
  cursor: ew-resize;
}

.handle-grip {
  position: absolute;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid color-mix(in srgb, var(--dust) 80%, white);
  background: color-mix(in srgb, var(--plate) 55%, transparent);
  backdrop-filter: blur(2px);
}

.handle-grip::before,
.handle-grip::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 0;
  height: 0;
  border-block: 4px solid transparent;
  translate: 0 -50%;
}

.handle-grip::before {
  left: 7px;
  border-inline-end: 5px solid var(--text);
}

.handle-grip::after {
  right: 7px;
  border-inline-start: 5px solid var(--text);
}

.frame-note {
  position: absolute;
  inset-inline: 0;
  top: 50%;
  translate: 0 -50%;
  margin: 0;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 0 1rem;
}

.frame-note:empty {
  display: none;
}

/* -------------------------------------------------------------- controls */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  align-items: center;
}

.transport,
.layers {
  display: flex;
  gap: 0.35rem;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--rule-bright);
  background: var(--panel);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  cursor: pointer;
}

.button:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--dim);
  background: var(--panel-high);
}

.button:disabled {
  opacity: 0.4;
  cursor: default;
}

.button svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.button-icon {
  padding-inline: 0.55rem;
}

/* Beats .button:hover, which is otherwise more specific. */
.button.button-layer[aria-pressed="true"] {
  color: var(--dust);
  border-color: var(--dust-dim);
  background: color-mix(in srgb, var(--dust) 10%, var(--panel));
}

.button-play .glyph-pause {
  display: none;
}

.button.button-play[aria-pressed="true"] {
  color: var(--dust);
  border-color: var(--dust-dim);
}

.button-play[aria-pressed="true"] .glyph-play {
  display: none;
}

.button-play[aria-pressed="true"] .glyph-pause {
  display: inline-block;
}

/* ------------------------------------------------------------------ tape */

.tape-wrap {
  display: grid;
  gap: 0.3rem;
}

.tape {
  position: relative;
  height: 46px;
  border: 1px solid var(--rule);
  border-bottom: none;
  background: linear-gradient(var(--panel), color-mix(in srgb, var(--panel) 40%, var(--plate)));
  cursor: crosshair;
}

.tape-baseline {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  height: 1px;
  background: var(--rule-bright);
}

.tick {
  position: absolute;
  bottom: 0;
  width: 2px;
  height: 11px;
  background: var(--rule-bright);
  translate: -50% 0;
}

.tick.is-ready {
  height: 18px;
  background: var(--muted);
}

.tick.is-current {
  height: 100%;
  background: var(--dust);
}

.tape-cursor {
  position: absolute;
  top: 4px;
  translate: -50% 0;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--dust);
  white-space: nowrap;
  pointer-events: none;
  padding-inline: 0.3rem;
  background: color-mix(in srgb, var(--plate) 80%, transparent);
}

.tape-axis {
  position: relative;
  height: 1.1rem;
}

.axis-label {
  position: absolute;
  top: 0;
  translate: -50% 0;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--dim);
  white-space: nowrap;
}

.axis-label::before {
  content: "";
  position: absolute;
  top: -0.35rem;
  left: 50%;
  width: 1px;
  height: 0.3rem;
  background: var(--rule-bright);
}

.tape-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.9rem;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--dim);
}

.key {
  display: inline-block;
  width: 2px;
  height: 10px;
  margin-inline-end: 0.15rem;
  vertical-align: -1px;
}

.key-scan {
  background: var(--rule-bright);
}

.key-ready {
  background: var(--muted);
  height: 14px;
}

.key-now {
  background: var(--dust);
  height: 14px;
}

.tape-count {
  margin-inline-start: auto;
}

/* -------------------------------------------------------------- manifest */

.manifest {
  border: 1px solid var(--rule);
  background: var(--panel);
  padding: 0.9rem 1rem 1.1rem;
  min-width: 0;
}

.manifest-head {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.7rem;
  margin-bottom: 0.2rem;
}

.manifest-when {
  display: block;
  font-family: var(--mono);
  font-size: 1.05rem;
  color: var(--text);
  word-break: break-all;
}

.manifest-age {
  display: block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dust);
  margin-top: 0.2rem;
}

.field {
  padding: 0.55rem 0;
  border-bottom: 1px solid color-mix(in srgb, var(--rule) 60%, transparent);
}

.field:last-of-type {
  border-bottom: none;
}

.field-label {
  display: block;
  font-size: 0.62rem;
  font-variation-settings: "wght" 550;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
}

.field-value {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text);
  margin-top: 0.15rem;
  word-break: break-word;
}

.field-value small {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
}

.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.75rem;
}

.download {
  flex: 1 1 auto;
  text-align: center;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--rule-bright);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
}

.download:hover {
  color: var(--dust);
  border-color: var(--dust-dim);
}

.download[aria-disabled="true"] {
  opacity: 0.35;
  pointer-events: none;
}

/* ---------------------------------------------------------------- footer */

.foot {
  border-top: 1px solid var(--rule);
  background: var(--panel);
  padding: 1rem var(--gap) 1.4rem;
  /* Attribution is prose to be read, not chrome: --dim lands near 3:1 on the
     panel, which is under AA for text this size. */
  color: var(--muted);
  font-size: 0.8rem;
  display: grid;
  gap: 0.5rem;
}

.foot p {
  margin: 0;
  max-width: 68ch;
}

/* Attribution: who made the observations this page is derived from. Set as a
   term-and-sources list rather than prose, so a reader chasing one source
   finds it without reading the rest. */

.credits {
  display: grid;
  gap: 0.6rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--rule);
}

.credits-heading {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.credits-list {
  margin: 0;
  display: grid;
  gap: 0.7rem;
}

.credit {
  display: grid;
  gap: 0.2rem;
}

.credit dt {
  font-size: 0.62rem;
  font-variation-settings: "wght" 550;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.credit dd {
  margin: 0;
  max-width: 72ch;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--muted);
  /* A DOI is one long unbreakable token and will push past a phone-width
     column unless it is allowed to break anywhere. */
  overflow-wrap: anywhere;
}

.credit code {
  font-family: var(--mono);
  font-size: 0.92em;
  color: var(--text);
}

.credits-note {
  font-size: 0.78rem;
}

@media (min-width: 720px) {
  .credit {
    grid-template-columns: 11rem minmax(0, 1fr);
    column-gap: 1.4rem;
  }

  .credit dt {
    grid-column: 1;
    text-align: end;
    padding-top: 0.1rem;
  }

  .credit dd {
    grid-column: 2;
  }
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* --------------------------------------------------------------- states */

html[data-state="failed"] .viewer,
html[data-state="failed"] .manifest {
  opacity: 0.5;
}

.notice {
  grid-column: 1 / -1;
  border: 1px solid var(--boundary);
  background: color-mix(in srgb, var(--boundary) 8%, var(--panel));
  padding: 0.8rem 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text);
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}