/* Number Lab / Redcastle — the album's chassis, carrying a controlled test.
   Tokens and the paper shell come from styles.css. */

.lab-paper .masthead {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 12px;
}

.lab-deck {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
}

/* ---------- heading ---------- */

.lab-heading {
  padding: 20px var(--gutter) 0;
}

.lab-heading h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.25;
  text-wrap: pretty;
}

.lab-heading .slug {
  display: block;
  margin: 8px 0 0;
  color: var(--ink-faint);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.7;
  white-space: normal;
}

/* ---------- shared clock ---------- */

.lab-clock {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 18px var(--gutter) 0;
  padding: 11px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.lab-clock #lab-state {
  color: var(--ink-faint);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.lab-clock div {
  display: flex;
  gap: 5px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

/* ---------- transport, set as a line of type ---------- */

.lab-transport {
  display: flex;
  gap: 22px;
  padding: 13px var(--gutter) 0;
}

.lab-transport button {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 120ms ease;
}

.lab-transport .lab-play {
  display: flex;
  gap: 8px;
  color: var(--ink);
  font-weight: 600;
}

/* ---------- version rows ---------- */

.lab-versions {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 18px var(--gutter) 0;
  overscroll-behavior: contain;
  scrollbar-width: none;
}

.lab-versions::-webkit-scrollbar {
  display: none;
}

.lab-version {
  --row-fill: var(--ink-blank);
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-bottom: 1px dotted var(--rule-soft);
  transition: background-color 120ms ease;
}

.lab-version-pick {
  display: flex;
  width: 100%;
  align-items: flex-start;
  gap: 12px;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.lab-letter {
  flex: none;
  width: 16px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.2;
}

.lab-version-name {
  display: flex;
  flex: 1;
  min-width: 0;
  flex-direction: column;
}

.lab-version-name strong {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.2;
  text-wrap: pretty;
}

.lab-version-name small {
  display: block;
  margin-top: 6px;
  color: var(--ink-faint);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.lab-version-state {
  flex: none;
  padding: 2px 5px;
  border: 1px solid var(--rule);
  color: var(--ink-muted);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

/* ---------- per-row scrub, drawn as the 3px readout the design specifies ---------- */

/* indented to sit under the name, clear of the letter gutter */
.lab-row-seek {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 8px;
  margin-left: 28px;
}

.lab-row-seek input[type="range"] {
  flex: 1;
  height: 12px;
  margin: 0;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

.lab-row-seek input[type="range"]::-webkit-slider-runnable-track {
  height: 3px;
  background: linear-gradient(
    to right,
    var(--row-fill) var(--row-progress, 0%),
    var(--perf) var(--row-progress, 0%)
  );
}

.lab-row-seek input[type="range"]::-webkit-slider-thumb {
  width: 12px;
  height: 12px;
  margin-top: -4.5px;
  appearance: none;
  border: 0;
  border-radius: 50%;
  background: transparent;
}

.lab-row-seek input[type="range"]::-moz-range-track {
  height: 3px;
  background: linear-gradient(
    to right,
    var(--row-fill) var(--row-progress, 0%),
    var(--perf) var(--row-progress, 0%)
  );
}

.lab-row-seek input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: 0;
  border-radius: 50%;
  background: transparent;
}

.lab-row-seek time {
  flex: none;
  color: var(--ink-muted);
  font-size: 10.5px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* the sounding row */
.lab-version.is-active {
  --row-fill: var(--accent);
  background: var(--paper-hover);
}

.lab-version.is-active .lab-letter {
  color: var(--accent);
}

.lab-version.is-active .lab-version-state {
  border-color: var(--rule-accent);
  color: var(--accent);
}

/* E–H break the settings on purpose, so they sit on their own tint */
.lab-version-experimental {
  background: var(--paper-experiment);
}

.lab-version-experimental .lab-letter {
  color: var(--accent);
}

.lab-version-experimental.is-active {
  background: var(--paper-hover);
}

/* ---------- the rule that splits standard from experimental ---------- */

.lab-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 22px 0 14px;
}

.lab-divider > span {
  color: var(--accent);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  white-space: nowrap;
}

.lab-divider::after {
  order: 1;
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--rule-accent) 0 4px, transparent 4px 8px);
  content: "";
}

.lab-divider button {
  order: 2;
  flex: none;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: 10px;
  letter-spacing: 0.1em;
  cursor: pointer;
  white-space: nowrap;
  transition: color 120ms ease;
}

/* ---------- the conditions note ---------- */

.lab-note {
  margin: 20px 0 24px;
  padding: 14px 16px;
  border: 1px solid var(--rule);
  background: var(--paper-strip);
}

.lab-note span {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-faint);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.lab-note p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 10.5px;
  line-height: 1.7;
}

.lab-status {
  min-height: 16px;
  margin: 10px 0 0;
  padding-inline: var(--gutter);
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.1em;
}

@media (hover: hover) {
  .lab-transport button:hover,
  .lab-divider button:hover {
    color: var(--accent);
  }

  .lab-version:hover:not(.is-active) {
    background: var(--paper-hover);
  }
}

@media (min-width: 68rem) {
  .lab-paper {
    width: min(100%, 46rem);
  }

  .lab-heading h1 {
    font-size: 30px;
  }
}