:root {
  --formalin: #141c1a;
  --formalin-deep: #0d1312;
  --surface: #1e2826;
  --line: #34423f;
  --bone: #e9e3d2;
  --sage: #8da197;
  --ochre: #d6a23e;
  --serif: "Spectral", Georgia, serif;
  --sans: "Archivo", "Segoe UI", sans-serif;
  --gutter: 32px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--formalin-deep);
  color: var(--bone);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

#canvas-container {
  position: absolute;
  inset: 0;
}

/* Overlays let drags through to the canvas except on their controls */
.tag, .specimens, .flow, .facts, .status {
  position: absolute;
  z-index: 10;
  pointer-events: none;
}

.specimens button, .flow button, .flow input {
  pointer-events: auto;
}

/* Specimen tag */
.tag {
  top: var(--gutter);
  left: var(--gutter);
  max-width: 30rem;
}

h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
}

.family {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 1.35rem;
  color: var(--ochre);
  margin-top: 0.35rem;
}

.caption {
  margin-top: 1rem;
  max-width: 22rem;
  font-size: 0.85rem;
  color: var(--sage);
}

/* Specimen picker */
.specimens {
  top: var(--gutter);
  right: var(--gutter);
}

.specimens ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.specimens button {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  background: none;
  border: none;
  color: var(--sage);
  font-family: var(--sans);
  font-size: 0.95rem;
  font-stretch: 87%;
  padding: 6px 0 6px 12px;
  cursor: pointer;
  text-align: right;
}

.specimens button:hover {
  color: var(--bone);
}

.specimens button .key {
  font-size: 0.75rem;
  color: var(--line);
  font-variant-numeric: tabular-nums;
}

.specimens button[aria-current="true"] {
  color: var(--bone);
  box-shadow: inset -2px 0 0 var(--ochre);
  padding-right: 10px;
}

.specimens button[aria-current="true"] .key {
  color: var(--ochre);
}

/* Flow-time ruler */
.flow {
  left: var(--gutter);
  right: var(--gutter);
  bottom: var(--gutter);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
}

.flow-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.play {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--ochre);
  background: var(--ochre);
  color: var(--formalin-deep);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background 0.15s ease;
}

.play:hover {
  background: #e4b552;
}

.play svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.play .icon-pause, .play.is-playing .icon-play {
  display: none;
}

.play.is-playing .icon-pause {
  display: block;
}

.readout {
  display: flex;
  flex-direction: column;
  min-width: 6.5rem;
  font-variant-numeric: tabular-nums;
}

.readout .t {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 300;
  line-height: 1;
}

.readout .t output {
  font-family: var(--sans);
  font-size: 1.5rem;
  font-weight: 400;
  font-stretch: 85%;
}

.readout .step {
  font-size: 0.8rem;
  color: var(--sage);
  margin-top: 4px;
}

.ruler {
  position: relative;
  padding-top: 6px;
}

.ticks {
  position: absolute;
  left: 0;
  right: 0;
  top: 22px;
  height: 10px;
  pointer-events: none;
}

.ticks span {
  position: absolute;
  top: 0;
  width: 1px;
  height: 6px;
  background: var(--line);
  transform: translateX(-0.5px);
}

.ticks span.major {
  height: 10px;
  background: var(--sage);
}

.ticks span.passed {
  background: var(--ochre);
}

.ends {
  display: flex;
  justify-content: space-between;
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--sage);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 32px;
  background: transparent;
  cursor: pointer;
  --fill: 0%;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: linear-gradient(to right, var(--ochre) var(--fill), var(--line) var(--fill));
}

input[type="range"]::-moz-range-track {
  height: 2px;
  background: linear-gradient(to right, var(--ochre) var(--fill), var(--line) var(--fill));
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 4px;
  height: 26px;
  margin-top: -12px;
  border-radius: 2px;
  background: var(--bone);
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 4px;
  height: 26px;
  border-radius: 2px;
  background: var(--bone);
  border: none;
}

.flow-toggles {
  display: flex;
  gap: 8px;
}

.toggle {
  font-family: var(--sans);
  font-size: 0.85rem;
  padding: 8px 14px;
  border-radius: 999px;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: rgba(20, 28, 26, 0.7);
  color: var(--sage);
  cursor: pointer;
}

.toggle:hover {
  color: var(--bone);
  border-color: var(--sage);
}

.toggle[aria-pressed="true"] {
  color: var(--ochre);
  border-color: var(--ochre);
}

.facts {
  right: var(--gutter);
  bottom: calc(var(--gutter) + 72px);
  font-size: 0.8rem;
  color: var(--sage);
  font-variant-numeric: tabular-nums;
}

.caption a {
  display: inline-block;
  margin-top: 0.4rem;
  color: var(--bone);
  text-underline-offset: 3px;
  text-decoration-color: var(--ochre);
  pointer-events: auto;
}

.caption a:hover {
  color: var(--ochre);
}

.status {
  left: var(--gutter);
  top: 50%;
  max-width: 24rem;
  font-size: 0.9rem;
  color: var(--ochre);
}

.status:empty {
  display: none;
}

.status code {
  color: var(--bone);
}

button:focus-visible, input:focus-visible, a:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 3px;
}

@media (max-width: 720px) {
  :root {
    --gutter: 16px;
  }

  .caption {
    display: none;
  }

  .specimens {
    top: auto;
    left: 0;
    right: 0;
    bottom: 176px;
    overflow-x: auto;
    pointer-events: auto;
  }

  .specimens ul {
    flex-direction: row;
    padding: 0 var(--gutter);
    gap: 4px;
  }

  .specimens button {
    white-space: nowrap;
    padding: 8px 10px;
  }

  .specimens button[aria-current="true"] {
    box-shadow: inset 0 -2px 0 var(--ochre);
    padding-right: 10px;
  }

  .flow {
    grid-template-columns: auto 1fr;
    gap: 12px 18px;
  }

  .ruler {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .flow-toggles {
    justify-self: end;
  }

  .facts {
    display: none;
  }
}