/* =============================================================================
   SPATIAL · lab.html — acoustic field instrument
   -----------------------------------------------------------------------------
   OWNER: lab-instrument agent.  Loaded through `extra_css` on /lab/ only.
   Scope: every selector is prefixed .lab- or rooted at .sp-lab, so the page
   cannot leak into the rest of the site.

   Rules obeyed here:
   · colours / type / easing come from space.css tokens (no new palette);
   · 1 px borders only — no radius, no shadow, no glow;
   · the page is a normal-flow document in ambient/flat mode.  The field map is
     a fixed-aspect canvas whose height follows its column width.
   ========================================================================== */

/* ---------- 0. Page shell -------------------------------------------------- */

/* The runtime may or may not have switched to document mode yet.  This page is
   laid out as a document regardless of mode: normal flow, no projected panels. */
.sp-lab {
  pointer-events: auto;
  overflow: clip;
}

.sp-lab > .sp-layer,
.sp-flat .sp-lab > .sp-layer,
.sp-flat.sp-ambient .sp-lab > .sp-layer {
  position: static;
  inset: auto;
  z-index: auto;
  display: block;
  padding: clamp(104px, 13vh, 150px) clamp(16px, 3.2vw, 44px) clamp(40px, 6vw, 86px);
}

/* the ambient shell adds its own top padding to the first station; the lab
   wants the instrument on the first screen, so pin the shell padding by id. */
#sp-lab > .sp-layer {
  padding: clamp(94px, 11.5vh, 116px) clamp(16px, 3.2vw, 44px) clamp(40px, 6vw, 86px);
}

/* .sp-layer is pointer-events:none in space.css; a document page must restore
   hit testing or every control becomes click-through. */
.sp-lab > .sp-layer { pointer-events: auto; }

.lab-wrap {
  width: min(1440px, 100%);
  margin: 0 auto;
}

/* shared hard-line block */
.lab-figure,
.lab-block {
  position: relative;
  border: 1px solid var(--ln-2);
  background: var(--c-ink);
  background: color-mix(in srgb, var(--c-void) 84%, transparent);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
  backdrop-filter: blur(12px) saturate(120%);
}

/* one structural corner tick per block — the site's frame language, not ornament */
.lab-figure::before,
.lab-block::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 22px;
  height: 1px;
  background: var(--c-cyan);
  opacity: .5;
  pointer-events: none;
}

.lab-kicker {
  margin: 0;
  font: 500 9.5px/1.3 var(--f-mono);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.lab-kicker--dim {
  font-weight: 400;
  letter-spacing: .12em;
  color: var(--c-dim);
}

.lab-data {
  text-transform: none;
  letter-spacing: .08em;
}

.lab-kicker b {
  font-weight: 400;
  color: var(--c-mist);
  font-variant-numeric: tabular-nums;
}

/* ---------- 1. Masthead ---------------------------------------------------- */

.lab-head {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(300px, .82fr);
  gap: clamp(24px, 3.4vw, 54px);
  align-items: end;
  padding-bottom: clamp(18px, 2.2vw, 26px);
  border-bottom: 1px solid var(--ln-2);
}

.lab-head .sp-eyebrow { margin-bottom: 14px; }

.lab-eyebrow-short { display: none; }

@media (max-width: 400px) {
  .lab-eyebrow-full { display: none; }
  .lab-eyebrow-short { display: inline; }
}

.lab-head h1 {
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.02;
}

.lab-head h1 em {
  font-style: normal;
  color: var(--c-cyan);
}

.lab-head__lede {
  margin-top: 14px;
}

.lab-head__lede .sp-lede {
  margin-top: 0;
  max-width: 56ch;
}

.lab-spec {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 0;
  border-top: 1px solid var(--ln-2);
}

.lab-spec > div {
  padding: 10px 0 9px;
  border-bottom: 1px solid var(--ln-1);
  min-width: 0;
}

.lab-spec > div:nth-child(even) {
  padding-left: 14px;
  border-left: 1px solid var(--ln-1);
}

.lab-spec dt {
  margin: 0;
  font: 400 8.5px/1.2 var(--f-mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-dim);
  white-space: nowrap;
}

.lab-spec dd {
  margin: 5px 0 0;
  font: 300 13px/1 var(--f-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-mist);
  white-space: nowrap;
}

.lab-spec dd b {
  font-weight: 400;
  font-size: 17px;
  letter-spacing: -.02em;
  color: var(--c-white);
}

.lab-spec dd i {
  font-style: normal;
  font-size: 9px;
  color: var(--c-dim);
  margin-left: 2px;
}

/* ---------- 2. Instrument grid -------------------------------------------- */

.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(360px, 1fr);
  gap: clamp(18px, 2vw, 28px);
  align-items: start;
  margin-top: clamp(18px, 2.2vw, 26px);
}

/* ---------- 3. Field figure ------------------------------------------------ */

.lab-figure {
  margin: 0;
  min-width: 0;
}

.lab-figure__head,
.lab-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 13px;
  border-bottom: 1px solid var(--ln-1);
  min-height: 36px;
}

.lab-figure__head .lab-kicker:last-child {
  text-align: right;
  white-space: nowrap;
  text-transform: none;
  letter-spacing: .04em;
}

.lab-canvas-wrap {
  padding: clamp(5px, .7vw, 9px);
  background: var(--c-void);
}

#lab-field {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 380 / 254;
  border: 1px solid var(--ln-1);
  background: #000;
  touch-action: manipulation;
}

.lab-legend {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 10px;
  padding: 8px 13px;
  border-top: 1px solid var(--ln-1);
  border-bottom: 1px solid var(--ln-1);
}

.lab-legend__ramp {
  width: clamp(84px, 11vw, 132px);
  height: 7px;
  border: 1px solid var(--ln-2);
  background: linear-gradient(90deg,
    #000 0%, #01040a 18%, #02101f 32%, #052a44 48%,
    #0b5570 63%, #1f93b3 77%, #56cbe4 89%, #e9fbff 97%, #fff 100%);
}

.lab-legend__spacer { margin-left: auto; }

.lab-legend__key {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font: 400 8.5px/1 var(--f-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-dim);
}

.lab-legend__key i {
  display: block;
  width: 14px;
  height: 1px;
  background: var(--c-cyan);
  opacity: .45;
}

.lab-legend__note {
  margin-left: 2px;
}

.lab-figure__cap {
  margin: 0;
  padding: 10px 13px 12px;
  font: 400 9px/1.7 var(--f-mono);
  letter-spacing: .04em;
  color: var(--c-dim);
  max-width: 92ch;
}

.lab-figure__cap b {
  font-weight: 400;
  color: var(--c-steel);
}

/* ---------- 4. Side column ------------------------------------------------ */

.lab-side {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 1.6vw, 20px);
  min-width: 0;
}

.lab-block { min-width: 0; }

.lab-block__head { min-height: 34px; padding: 9px 13px; }

.lab-block__body {
  padding: 2px 13px 12px;
}

/* ---------- 5. Controls --------------------------------------------------- */

.lab-ctl {
  padding: 12px 0 11px;
  border-bottom: 1px solid var(--ln-1);
}

.lab-ctl:last-of-type { border-bottom: 0; }

.lab-ctl__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.lab-ctl__label {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font: 400 9.5px/1.2 var(--f-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-steel);
  cursor: pointer;
}

.lab-ctl__label i {
  font-style: normal;
  font-size: 8px;
  color: var(--c-dim);
  letter-spacing: .04em;
}

.lab-ctl__val {
  font: 300 13px/1 var(--f-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-mist);
  white-space: nowrap;
}

.lab-ctl__val b {
  font-weight: 400;
  font-size: 15px;
  color: var(--c-white);
}

.lab-ctl__val span {
  margin-left: 3px;
  font-size: 9px;
  color: var(--c-dim);
}

/* native range, restyled — not hidden, keyboard and touch behaviour intact */
.lab-range {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 18px;
  margin: 11px 0 5px;
  padding: 0;
  background: transparent;
  cursor: pointer;
}

.lab-range::-webkit-slider-runnable-track {
  height: 1px;
  background: linear-gradient(to right,
    var(--c-cyan) 0 var(--fill, 50%),
    var(--ln-2) var(--fill, 50%) 100%);
}

.lab-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 3px;
  height: 17px;
  margin-top: -8px;
  background: var(--c-cyan);
  border: 0;
  border-radius: 0;
}

.lab-range::-moz-range-track {
  height: 1px;
  background: var(--ln-2);
}

.lab-range::-moz-range-progress {
  height: 1px;
  background: var(--c-cyan);
}

.lab-range::-moz-range-thumb {
  width: 3px;
  height: 17px;
  background: var(--c-cyan);
  border: 0;
  border-radius: 0;
}

.lab-range:focus { outline: none; }

.lab-range:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 5px;
}

.lab-scale {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font: 400 8px/1 var(--f-mono);
  letter-spacing: .06em;
  color: var(--c-dim);
}

.lab-ctl__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--ln-1);
}

.lab-ctl__row .lab-ctl__label { text-transform: uppercase; }

.lab-select {
  position: relative;
  flex: 0 0 auto;
  width: 106px;
  height: 32px;
  border: 1px solid var(--ln-2);
  background: var(--c-slate);
}

.lab-select select {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 100%;
  padding: 0 28px 0 10px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--c-white);
  font: 300 13px/1 var(--f-mono);
  font-variant-numeric: tabular-nums;
  cursor: pointer;
}

.lab-select select:focus { outline: none; }

.lab-select select:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 2px;
}

.lab-select i {
  position: absolute;
  right: 11px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -4px;
  border-right: 1px solid var(--c-steel);
  border-bottom: 1px solid var(--c-steel);
  transform: rotate(45deg);
  pointer-events: none;
}

.lab-check {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 0 2px;
  font: 400 9.5px/1.2 var(--f-mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-steel);
  cursor: pointer;
  user-select: none;
}

.lab-check input {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--ln-3);
  background: transparent;
  cursor: pointer;
}

.lab-check input::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 3px;
  width: 6px;
  height: 6px;
  background: var(--c-cyan);
  transform: scale(0);
  transition: transform .18s var(--e-out);
}

/* generated content on a replaced input is engine-dependent; the cyan fill is
   the reliable checked state, the inner square is the refinement. */
.lab-check input:checked {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.lab-check input:checked::after {
  transform: scale(1);
  background: var(--c-void);
}

.lab-check input:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 3px;
}

.lab-reset {
  font: 400 8.5px/1 var(--f-mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-dim);
  border-bottom: 1px solid var(--ln-2);
  padding-bottom: 3px;
  transition: color .25s var(--e-out), border-color .25s var(--e-out);
}

.lab-reset:hover { color: var(--c-cyan); border-color: var(--c-cyan); }

.lab-ctl__note {
  margin: 11px 0 0;
  font: 400 8.5px/1.65 var(--f-mono);
  letter-spacing: .04em;
  color: rgba(147, 169, 189, .55);
}

/* ---------- 6. Readout ---------------------------------------------------- */

.lab-read {
  margin: 0;
  padding: 3px 13px 8px;
}

.lab-read__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--ln-1);
}

.lab-read__row:last-child { border-bottom: 0; }

.lab-read dt {
  margin: 0;
  font: 400 9px/1.35 var(--f-mono);
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.lab-lc { text-transform: none !important; letter-spacing: .04em; }

.lab-read dd {
  margin: 0;
  font: 300 12.5px/1.2 var(--f-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-mist);
  white-space: nowrap;
}

.lab-read dd b {
  font-weight: 400;
  color: var(--c-white);
}

.lab-read dd i {
  font-style: normal;
  font-size: 9px;
  letter-spacing: .04em;
  color: var(--c-dim);
  margin-left: 3px;
}

.lab-read__row--key dd b { color: var(--c-cyan); }

.lab-read__foot {
  margin: 0;
  padding: 9px 13px 12px;
  border-top: 1px solid var(--ln-1);
  font: 400 8.5px/1.7 var(--f-mono);
  letter-spacing: .03em;
  color: rgba(147, 169, 189, .55);
}

/* ---------- 7. Phase strip ------------------------------------------------ */

.lab-phase__wrap {
  padding: 9px 13px 2px;
}

#lab-phase-cv {
  display: block;
  width: 100%;
  height: 72px;
}

.lab-phase__cap {
  margin: 0;
  padding: 5px 13px 11px;
  font: 400 8.5px/1.65 var(--f-mono);
  letter-spacing: .04em;
  color: rgba(147, 169, 189, .55);
}

.lab-phase.is-off .lab-phase__wrap,
.lab-phase.is-off .lab-phase__cap { display: none; }

.lab-phase.is-off .lab-block__head { border-bottom: 0; }

.lab-phase__meta { white-space: nowrap; text-transform: none; letter-spacing: .04em; }

/* ---------- 8. Principle strip -------------------------------------------- */

.lab-principles {
  position: relative;
  margin-top: clamp(34px, 5vw, 68px);
  padding: 0 clamp(14px, 1.8vw, 22px) 5px;
  border: 1px solid var(--ln-2);
  background: var(--c-ink);
}

.lab-principles::before,
.lab-note::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 22px;
  height: 1px;
  background: var(--c-cyan);
  opacity: .5;
  pointer-events: none;
}

.lab-principles__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 17px 0 14px;
}

.lab-steps {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ln-1);
}

.lab-step {
  display: flex;
  flex-direction: column;
  gap: 9px;
  min-width: 0;
  padding: 15px 14px 18px 14px;
  border-left: 1px solid var(--ln-1);
}

.lab-step:first-child {
  border-left: 0;
  padding-left: 0;
}

.lab-step:last-child { padding-right: 0; }

.lab-step__no {
  font: 300 10px/1 var(--f-mono);
  letter-spacing: .06em;
  color: var(--c-dim);
}

.lab-step__fig {
  display: block;
  width: 64px;
  height: 40px;
  color: var(--c-steel);
  overflow: visible;
}

.lab-step__fig .lab-dot { fill: var(--c-cyan); stroke: none; }

.lab-step__fig .lab-faint { opacity: .38; }

.lab-step h3 {
  margin: 0;
  font: 500 13px/1.28 var(--f-display);
  letter-spacing: -.005em;
  color: var(--c-white);
}

.lab-step p {
  margin: 0;
  font: 400 10.5px/1.68 var(--f-cjk);
  letter-spacing: .01em;
  color: var(--c-steel);
  text-wrap: pretty;
}

.lab-step p .lab-en { font-family: var(--f-display); letter-spacing: .004em; }

/* ---------- 9. Technical note --------------------------------------------- */

.lab-note {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .58fr) minmax(0, 1fr);
  gap: clamp(24px, 4.4vw, 72px);
  margin-top: clamp(24px, 3vw, 40px);
  padding: clamp(20px, 2.4vw, 32px);
  border: 1px solid var(--ln-2);
  background: var(--c-ink);
}

.lab-note__aside {
  min-width: 0;
  align-self: start;
}

.lab-note__aside .sp-h2 {
  font-size: clamp(24px, 2.4vw, 34px);
}

.lab-note__title { margin-top: 10px; }

.lab-note__aside .sp-lede {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 13px;
  color: var(--c-dim);
}

.lab-assume {
  margin: 22px 0 0;
  padding: 0;
  border-top: 1px solid var(--ln-2);
}

.lab-assume > div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid var(--ln-1);
}

.lab-assume dt {
  margin: 0;
  font: 400 8.5px/1.4 var(--f-mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-dim);
}

.lab-assume dd {
  margin: 0;
  font: 300 10.5px/1.4 var(--f-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-steel);
}

.lab-notes { min-width: 0; }

.lab-notes .sp-body-copy {
  max-width: 74ch;
  margin-bottom: 1.35em;
  font-size: 13.5px;
  line-height: 1.95;
  color: var(--c-mist);
}

.lab-notes .sp-copy-en {
  font-size: 13.5px;
  line-height: 1.78;
}

.lab-notes b,
.lab-notes strong {
  font-weight: 500;
  color: var(--c-white);
}

.lab-notes code {
  font: 400 11.5px/1 var(--f-mono);
  letter-spacing: .02em;
  color: var(--c-cyan);
  white-space: nowrap;
}

.lab-notes .lab-formula {
  display: block;
  margin: 2px 0 1.3em;
  padding: 12px 14px;
  border: 1px solid var(--ln-2);
  border-left: 2px solid var(--c-cyan-2);
  font: 300 12px/1.7 var(--f-mono);
  font-variant-numeric: tabular-nums;
  color: var(--c-mist);
  overflow-x: auto;
}

.lab-notes .lab-formula em {
  font-style: normal;
  color: var(--c-cyan);
}

/* ---------- 10. Footer ---------------------------------------------------- */

.lab-foot {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin-top: clamp(34px, 5vw, 64px);
  padding-top: 15px;
  border-top: 1px solid var(--ln-1);
}

.lab-foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.lab-foot__note {
  margin: 0;
  font: 400 8.5px/1.7 var(--f-mono);
  letter-spacing: .06em;
  color: var(--c-dim);
}

/* ---------- 11. Responsive ------------------------------------------------- */

@media (max-width: 1180px) {
  .lab-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(320px, 1fr);
  }
}

@media (max-width: 1099px) {
  .lab-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .lab-side {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .lab-phase { grid-column: 1 / -1; }

  .lab-head {
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, .8fr);
    align-items: start;
  }
}

@media (max-width: 860px) {
  .lab-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

  .lab-spec { max-width: 520px; }

  .lab-side { grid-template-columns: minmax(0, 1fr); }

  .lab-phase { grid-column: auto; }

  .lab-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }

  .lab-step:nth-child(4) {
    border-left: 0;
    padding-left: 0;
  }

  .lab-step:nth-child(-n+3) {
    border-bottom: 1px solid var(--ln-1);
  }

  .lab-note { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 620px) {
  .lab-head h1 { font-size: clamp(26px, 7.2vw, 34px); }

  .lab-figure__head {
    flex-wrap: wrap;
    gap: 4px 14px;
  }

  .lab-figure__head .lab-kicker:last-child {
    text-align: left;
    white-space: normal;
  }

  .lab-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .lab-step:nth-child(4) {
    border-left: 1px solid var(--ln-1);
    padding-left: 14px;
  }

  .lab-step:nth-child(odd) {
    border-left: 0;
    padding-left: 0;
  }

  .lab-step:nth-child(-n+4) {
    border-bottom: 1px solid var(--ln-1);
  }

  .lab-step { min-height: 0; }

  .lab-legend__spacer { display: none; }

  .lab-legend__note {
    width: 100%;
    margin-left: 0;
  }
}

@media (max-width: 420px) {
  .sp-lab > .sp-layer,
  .sp-flat .sp-lab > .sp-layer,
  .sp-flat.sp-ambient .sp-lab > .sp-layer {
    padding-left: 12px;
    padding-right: 12px;
    padding-top: 116px;
  }

  .lab-spec > div:nth-child(even) { padding-left: 10px; }

  .lab-read { padding-left: 11px; padding-right: 11px; }

  .lab-figure__head,
  .lab-block__head,
  .lab-legend,
  .lab-figure__cap,
  .lab-ctl__note,
  .lab-read__foot { padding-left: 11px; padding-right: 11px; }

  .lab-ctl__label { letter-spacing: .08em; }

  .lab-read dt { font-size: 8.5px; }

  .lab-read dd { font-size: 12px; }
}

/* ---------- 12. Reduced motion -------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .sp-lab .lab-reset,
  .sp-lab .lab-check input::after,
  .sp-lab .lab-ctl__label,
  .sp-lab .lab-check {
    transition: none !important;
  }
}