/* ───────────── Master fader + VU ─────────────
 * Console-style: tick-marked vertical fader on the left, twin segmented
 * LED VU meters on the right, both inside a recessed dark panel.
 * Custom rendering throughout — `appearance: none` so the browser
 * doesn't fall back to its blue-track default vertical slider, which
 * ignores ::-webkit-slider-thumb overrides and offsets the thumb. */

.np-master {
  display: flex;
  align-items: stretch;
  gap: 10px;
  height: 140px;
  padding: 8px 10px;
  background: linear-gradient(180deg, #141414, #0d0d0d);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.4);
}

/* Fader column with tick marks down both sides. */
.master-fader-track {
  position: relative;
  height: 100%;
  width: 44px;
  display: flex;
  align-items: stretch;
  justify-content: center;
}
.master-fader-track::before,
.master-fader-track::after {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  width: 5px;
  background-image: repeating-linear-gradient(
    to bottom,
    var(--line-strong) 0,
    var(--line-strong) 1px,
    transparent 1px,
    transparent 8px
  );
  pointer-events: none;
}
.master-fader-track::before { left: 4px; }
.master-fader-track::after { right: 4px; }

.master-fader {
  /* No `appearance: slider-vertical` — that's a legacy webkit shortcut
     that forces a blue-track default vertical slider AND ignores
     ::-webkit-slider-thumb overrides (which is why the thumb floats
     left of center). `writing-mode: vertical-lr` rotates the
     horizontal range input, `direction: rtl` puts max at the top. */
  -webkit-appearance: none;
  appearance: none;
  -moz-appearance: none;
  writing-mode: vertical-lr;
  direction: rtl;
  width: 100%;
  height: 100%;
  background: transparent;
  cursor: pointer;
  outline: none;
  margin: 0;
  padding: 0;
}
.master-fader::-webkit-slider-runnable-track {
  width: 4px;
  height: 100%;
  background: #050505;
  border: 1px solid var(--line);
  border-radius: 2px;
}
.master-fader::-moz-range-track {
  width: 4px;
  height: 100%;
  background: #050505;
  border: 1px solid var(--line);
  border-radius: 2px;
}
.master-fader::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  /* In writing-mode: vertical-lr, `width` is the long (horizontal) axis
     and `height` is the thin (vertical) axis. Pill-shaped horizontal
     handle. margin-left: -12px centers it on the 4px track. */
  width: 28px;
  height: 14px;
  margin-left: -12px;
  background: linear-gradient(180deg, #6a6a6a 0%, #2a2a2a 55%, #161616 100%);
  border: 1px solid #050505;
  border-radius: 3px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    inset 0 -1px 0 rgba(0, 0, 0, 0.7),
    0 1px 2px rgba(0, 0, 0, 0.7);
  cursor: pointer;
}
.master-fader::-moz-range-thumb {
  width: 28px;
  height: 14px;
  background: linear-gradient(180deg, #6a6a6a 0%, #2a2a2a 55%, #161616 100%);
  border: 1px solid #050505;
  border-radius: 3px;
  cursor: pointer;
}