.scrollsec {
  position: relative;
  /* Extra height creates the scroll runway the pinned panel travels through. */
  min-height: 210vh;
}

.scrollsec__sticky {
  position: sticky;
  top: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-block: 90px;
  overflow: hidden;
}

.scrollsec__grid {
  display: grid;
  gap: 44px;
  align-items: center;
}
@media (min-width: 1000px) {
  .scrollsec__grid {
    grid-template-columns: 1fr 1.05fr;
    gap: 64px;
  }
}

.scrollsec__copy .section-title {
  margin: 14px 0 18px;
}

.scrollsec__controls {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
}
.scrollsec__controls-label {
  font-size: 0.76rem;
  color: var(--ink-light);
  margin-bottom: 12px;
}

/* ---------------- Lanes ---------------- */

.scrollsec__viz {
  position: relative;
  display: grid;
  gap: 12px;
  padding-left: 22px;
}

.lane {
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--hairline);
  background: var(--glass);
  backdrop-filter: blur(10px);
  transition: opacity 0.12s linear, transform 0.12s linear;
  will-change: opacity, transform;
}

.lane__head {
  display: flex;
  align-items: baseline;
  gap: 9px;
  margin-bottom: 10px;
}
.lane__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--stem);
  align-self: center;
}
.lane__name {
  font-size: 0.82rem;
  font-weight: 700;
}
.lane__hint {
  font-size: 0.7rem;
  color: var(--ink-light);
}

.lane__bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 46px;
}
.lane__bars span {
  flex: 1;
  min-width: 1px;
  border-radius: 1px;
  background: var(--stem);
  transition: opacity 0.2s linear;
}

.scrollsec__meter {
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: var(--hairline-strong);
  overflow: hidden;
}
.scrollsec__meter span {
  display: block;
  width: 100%;
  background: var(--accent);
  transition: height 0.1s linear;
}

/* ---------------- Mixer ---------------- */

.scrollsec--mixer {
  min-height: 190vh;
  background: var(--bg-warm);
}

.mixer__head {
  max-width: 760px;
}
.mixer__head .section-title {
  margin: 14px 0 16px;
}

.mixer__body {
  display: grid;
  gap: 32px;
  margin-top: 40px;
}
@media (min-width: 1000px) {
  .mixer__body {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
  }
}

.mixer__faders {
  display: grid;
  gap: 22px;
}

.fader__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 9px;
}
.fader__top label {
  font-size: 0.88rem;
  font-weight: 600;
}
.fader__top output {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.fader input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  cursor: pointer;
  background: linear-gradient(
    to right,
    var(--accent) 0%,
    var(--accent) var(--fill),
    var(--hairline-strong) var(--fill),
    var(--hairline-strong) 100%
  );
}
.fader input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.14);
  transition: transform 0.18s var(--ease-spring);
}
.fader input[type='range']::-webkit-slider-thumb:hover {
  transform: scale(1.14);
}
.fader input[type='range']::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}

.mixer__reset {
  justify-self: start;
}

.mixer__readout {
  position: relative;
  padding: 26px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.mixer__spec {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 18px;
  margin-bottom: 22px;
  position: relative;
}
.spec dt {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--ink-light);
  margin-bottom: 4px;
}
.spec dd {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.mixer__blend {
  display: flex;
  gap: 3px;
  height: 9px;
  margin-bottom: 18px;
  position: relative;
}
.mixer__blend span {
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.2s var(--ease-out);
}

.mixer__prompt {
  position: relative;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--ink-soft);
  padding: 14px 16px;
  border-radius: var(--radius-xs);
  background: rgba(26, 26, 26, 0.05);
  border-left: 3px solid var(--accent);
}

.mixer__cta {
  margin-top: 20px;
  position: relative;
}

@media (prefers-reduced-motion: reduce) {
  .scrollsec {
    min-height: auto;
  }
  .scrollsec__sticky {
    position: static;
    min-height: auto;
  }
  .lane {
    opacity: 1 !important;
    transform: none !important;
  }
}