/* ---------------------------------------------------
   Conductive Trace Resistance — Field Notes No. 06
   Loads after styles.css and only adds the simulator band; the page
   chrome (nav, header, hero, sections, footer) is the shared Field
   Notes layout from styles.css, untouched. Its own stylesheet (a
   sibling of textile-stretch-simulator.css, same skeleton, ctr-
   prefixed) so neither interactive note can restyle the other.
--------------------------------------------------- */

:root {
  --rust:        #a56b2e;
  --rust-bright: #e8b06e;
  --copper:      #c97e42;
  --silver:      #c4cccc;
}

.ctr {
  border-bottom: 1px solid var(--line);
}

.ctr__grid {
  display: grid;
  grid-template-columns: minmax(0, 17rem) minmax(0, 1fr) minmax(0, 20rem);
}

.ctr__controls,
.ctr__readouts {
  padding: 1.75rem 1.5rem 2rem;
}

.ctr__controls {
  border-right: 1px solid var(--line);
  margin-left: 6vw;
}

.ctr__readouts {
  border-left: 1px solid var(--line);
  margin-right: 6vw;
}

.ctr__stage {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ---------- labels shared by both side panels */

.ctr__eyebrow {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--petrol-bright);
  margin-bottom: 1.25rem;
}

.ctr__eyebrow + .ctr__eyebrow { margin-top: 2rem; }

.ctr__block { margin-bottom: 1.5rem; }
.ctr__block:last-child { margin-bottom: 0; }

.ctr__label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 0.5rem;
}

.ctr__value {
  font-size: 11px;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--ink);
  text-align: right;
}

.ctr__hint {
  font-size: 11px;
  line-height: 1.6;
  color: var(--ink-faint);
  margin-top: 0.5rem;
}

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

.ctr__segment {
  display: grid;
  grid-template-columns: 1fr;
  border: 1px solid var(--line-strong);
}

/* One option per row: three names side by side would have to be clipped
   in a 17rem column, and a stacked list reads like a specification. */
.ctr__segbtn {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: left;
  padding: 0.6rem 0.75rem;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.ctr__segbtn:last-child { border-bottom: 0; }
.ctr__segbtn:hover { color: var(--ink); }
.ctr__segbtn.is-active {
  background: var(--petrol);
  color: var(--black);
  font-weight: 500;
}
.ctr__segbtn:focus-visible { outline: 1px solid var(--petrol-bright); outline-offset: -3px; }

.ctr__range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 22px;
  background: transparent;
  margin: 0;
  cursor: pointer;
}
.ctr__range::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--line-strong);
}
.ctr__range::-moz-range-track {
  height: 1px;
  background: var(--line-strong);
}
.ctr__range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -5.5px;
  background: var(--black);
  border: 1px solid var(--petrol-bright);
  border-radius: 0;
  transition: background-color 0.15s ease;
}
.ctr__range::-moz-range-thumb {
  width: 12px;
  height: 12px;
  background: var(--black);
  border: 1px solid var(--petrol-bright);
  border-radius: 0;
}
.ctr__range:hover::-webkit-slider-thumb,
.ctr__range:focus-visible::-webkit-slider-thumb { background: var(--petrol-bright); }
.ctr__range:hover::-moz-range-thumb,
.ctr__range:focus-visible::-moz-range-thumb { background: var(--petrol-bright); }
.ctr__range:focus-visible { outline: none; }

.ctr__ticks {
  display: flex;
  justify-content: space-between;
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 0.15rem;
}

.ctr__presets {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.ctr__chip,
.ctr__btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.45rem 0.65rem;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.ctr__chip:hover,
.ctr__btn:hover { color: var(--petrol-bright); border-color: var(--petrol-bright); }
.ctr__chip.is-active { color: var(--black); background: var(--petrol-bright); border-color: var(--petrol-bright); }
.ctr__chip:focus-visible,
.ctr__btn:focus-visible { outline: 1px solid var(--petrol-bright); outline-offset: 2px; }

.ctr__btn--wide { width: 100%; padding: 0.7rem; }

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

.ctr__canvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--black-raised);
  touch-action: none;
  cursor: grab;
  outline: none;
}
.ctr__canvas:focus-visible { box-shadow: inset 0 0 0 1px var(--petrol-bright); }
body.is-pulling .ctr__canvas { cursor: grabbing; }

.ctr__stagebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.9rem 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 11px;
  color: var(--ink-faint);
}

.ctr__stagebar-hint { line-height: 1.5; }
.ctr__stagebar-hint strong { color: var(--ink-dim); font-weight: 500; }

.ctr__pulls { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.ctr__pull {
  appearance: none;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.45rem 0.65rem;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}
.ctr__pull:hover { color: var(--petrol-bright); border-color: var(--petrol-bright); }
.ctr__pull.is-active { background: var(--petrol-bright); color: var(--black); border-color: var(--petrol-bright); }
.ctr__pull:focus-visible { outline: 1px solid var(--petrol-bright); outline-offset: 2px; }

/* ---------- readouts */

.ctr__figures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.ctr__figure-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.3rem;
}

.ctr__figure-value {
  font-family: var(--serif);
  font-size: 1.45rem;
  white-space: nowrap;
  font-weight: 500;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.ctr__figure-sub {
  font-size: 10px;
  color: var(--ink-faint);
  margin-top: 0.35rem;
  line-height: 1.4;
}

.ctr__caption {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  margin-top: 1rem;
  line-height: 1.5;
}
.ctr__caption + .ctr__chart { margin-top: 0.4rem; }

.ctr__line {
  font-size: 11px;
  line-height: 1.6;
  color: var(--ink-dim);
  padding: 0.6rem 0;
  border-top: 1px solid var(--line);
}
.ctr__line strong { color: var(--ink); font-weight: 500; }
.ctr__line .ctr__k {
  display: block;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.15rem;
}
.ctr__line.is-warn strong { color: var(--rust-bright); }

.ctr__bar {
  position: relative;
  height: 4px;
  background: var(--line);
  margin: 0.4rem 0 0.3rem;
}
.ctr__bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: var(--petrol-bright);
  transition: width 0.08s linear;
}
.ctr__bar-fill.is-warn { background: var(--rust-bright); }

.ctr__chart {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  margin-top: 0.75rem;
}
.ctr__chart { aspect-ratio: 16 / 10; }

.ctr__legend {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin-top: 0.6rem;
}
.ctr__legend span::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 3px;
  margin-right: 0.45rem;
  vertical-align: middle;
  background: var(--petrol-bright);
}
.ctr__legend span.is-copper::before { background: var(--copper); }
.ctr__legend span.is-silver::before { background: var(--silver); }
.ctr__legend span.is-history::before { background: rgba(233, 236, 236, 0.45); height: 1px; }

/* ---------- key in the notes body */

.ctr-key {
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  vertical-align: -0.05em;
  margin-right: 0.35em;
  background: var(--petrol-bright);
}
.ctr-key--copper { background: var(--copper); }
.ctr-key--silver { background: var(--silver); }
.ctr-key--rust { background: var(--rust-bright); }

/* ---------- responsive */

@media (max-width: 1150px) {
  .ctr__grid {
    grid-template-columns: minmax(0, 17rem) minmax(0, 1fr);
  }
  .ctr__readouts {
    grid-column: 1 / -1;
    margin: 0 6vw;
    border-left: 0;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 3rem;
    padding-left: 0;
    padding-right: 0;
  }
  .ctr__readouts > .ctr__eyebrow { grid-column: 1 / -1; }
  .ctr__readouts > .ctr__eyebrow + .ctr__eyebrow { margin-top: 0; }
}

@media (max-width: 800px) {
  .ctr__grid { grid-template-columns: 1fr; }
  .ctr__stage { order: -1; }
  .ctr__controls {
    margin: 0 6vw;
    border-right: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
    padding-right: 0;
  }
  .ctr__readouts { grid-template-columns: 1fr; }
  .ctr__canvas { aspect-ratio: 4 / 3; }
}

/* ---------- per-structure spec line under the segmented control */
.ctr__spec {
  font-size: 10px;
  line-height: 1.6;
  color: var(--ink-faint);
  margin-top: 0.6rem;
  letter-spacing: 0.02em;
}