:root {
  --bg: #0a0b0d;
  --panel: #111417;
  --panel-2: #16191d;
  --line: #23262c;
  --line-soft: #1b1e23;
  --fg: #e9e7e2;
  --dim: #8b8f96;
  --c-kick: #ffab3d;
  --c-snare: #f0ede6;
  --c-hat: #46cbb8;
  --c-sub: #8f8cf2;
  --live: #ffab3d;
  --gutter: 104px;
  --cell-min: 30px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 14px;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  -webkit-font-smoothing: antialiased;
}

button, input, select { font: inherit; color: inherit; }

:focus-visible { outline: 2px solid var(--live); outline-offset: 2px; }

.k {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--dim);
}

/* ------------------------------------------------------------------ topbar */

.topbar {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) auto minmax(260px, 1fr);
  align-items: center;
  gap: 18px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #101215, #0c0e11);
}

.brand h1 {
  margin: 0;
  font-size: 20px;
  letter-spacing: 0.16em;
  font-weight: 600;
}
.brand p {
  margin: 2px 0 0;
  color: var(--dim);
  font-size: 11px;
  letter-spacing: 0.05em;
}

.transport { display: flex; align-items: center; gap: 14px; }

.play {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel-2);
  cursor: pointer;
  letter-spacing: 0.1em;
  font-size: 12px;
  font-family: var(--mono);
}
.play .glyph { font-size: 11px; color: var(--dim); }
.play[aria-pressed="true"] {
  border-color: var(--live);
  background: #1d1810;
  color: var(--live);
}
.play[aria-pressed="true"] .glyph { color: var(--live); }

.tempo {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel);
}
.tempo input {
  width: 58px;
  background: transparent;
  border: 0;
  font-family: var(--mono);
  font-size: 17px;
  text-align: right;
  padding: 0;
}
.tempo .unit, .tempo .k { font-size: 9.5px; color: var(--dim); font-family: var(--mono); letter-spacing: 0.11em; }

.pos { display: inline-flex; align-items: baseline; gap: 8px; min-width: 126px; }
.pos span:last-child { font-family: var(--mono); font-size: 13px; letter-spacing: 0.06em; }

.master { display: flex; flex-direction: column; gap: 4px; justify-self: end; min-width: 260px; }

.ctl {
  display: grid;
  grid-template-columns: 52px minmax(96px, 1fr) 44px;
  align-items: center;
  gap: 9px;
}
.ctl output { font-family: var(--mono); font-size: 11px; color: var(--fg); text-align: right; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 22px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--line);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 16px;
  margin-top: -7px;
  border-radius: 2px;
  background: var(--fg);
}
input[type="range"]:focus-visible::-webkit-slider-thumb { background: var(--live); }

/* ------------------------------------------------------------------- main */

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 308px;
  min-height: 0;
}

.stage {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 20px 22px 14px;
}

.railscroll {
  flex: 1;
  min-height: 0;
  overflow-x: auto;
  overflow-y: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  background: #0c0e11;
}

.rails {
  --gutter: 104px;
  display: grid;
  grid-auto-rows: minmax(58px, 1fr);
  gap: 1px;
  background: var(--line-soft);
  min-height: 100%;
}

.rail { display: grid; grid-template-columns: var(--gutter) minmax(0, 1fr); gap: 1px; background: var(--bg); }
.rail.selected { background: #14171b; }

.gutter {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 8px 10px;
  background: var(--panel);
  position: sticky;
  left: 0;
  z-index: 3;
}

.vname {
  display: flex;
  align-items: center;
  gap: 7px;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
}
.vname .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.55;
}
.rail[data-voice="kick"] .vname { color: var(--c-kick); }
.rail[data-voice="snare"] .vname { color: var(--c-snare); }
.rail[data-voice="hat"] .vname { color: var(--c-hat); }
.rail[data-voice="sub"] .vname { color: var(--c-sub); }
.rail[data-voice="kick"] .vname { --c: var(--c-kick); }
.rail[data-voice="snare"] .vname { --c: var(--c-snare); }
.rail[data-voice="hat"] .vname { --c: var(--c-hat); }
.rail[data-voice="sub"] .vname { --c: var(--c-sub); }
.vname[aria-pressed="false"] { color: #6e737a; }
.vname .hits { font-size: 9.5px; color: var(--dim); letter-spacing: 0.04em; }

.gbtns { display: flex; gap: 5px; }
.lock, .clr {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  padding: 3px 6px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--dim);
  cursor: pointer;
}
.lock.on { border-color: var(--live); color: var(--live); }
.lock:hover, .clr:hover { color: var(--fg); border-color: #3a4048; }

.cells {
  position: relative;
  display: grid;
  grid-template-columns: repeat(32, minmax(var(--cell-min), 1fr));
  gap: 1px;
  padding: 9px 10px 9px 12px;
  min-width: 0;
}

.cell {
  position: relative;
  min-width: var(--cell-min);
  min-height: 40px;
  padding: 0;
  border: 0;
  border-radius: 2px;
  background: #14171a;
  cursor: pointer;
  overflow: hidden;
  touch-action: none;
}
.cell[data-beat="0"] { background: #171a1e; }
.cell::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 0;
  background: var(--vcolor, #6e737a);
  opacity: 0.85;
}
.rail[data-voice="kick"] .cell { --vcolor: var(--c-kick); }
.rail[data-voice="snare"] .cell { --vcolor: var(--c-snare); }
.rail[data-voice="hat"] .cell { --vcolor: var(--c-hat); }
.rail[data-voice="sub"] .cell { --vcolor: var(--c-sub); }
.cell.on::after { height: calc(var(--v) * 100%); }
.cell.on { background: #20252a; }
.rail[data-voice="kick"] .cell.on { background: #2a2115; }
.rail[data-voice="snare"] .cell.on { background: #26272a; }
.rail[data-voice="hat"] .cell.on { background: #14262a; }
.rail[data-voice="sub"] .cell.on { background: #1e1d2c; }
.cell::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 1px;
  background: rgba(255, 255, 255, 0.06);
}
.cell[data-beat="0"]::before { background: rgba(255, 255, 255, 0.14); }
.cell.hot { box-shadow: inset 0 0 0 1px rgba(255, 171, 61, 0.85); }
.cell .tag {
  position: absolute;
  top: 3px;
  left: 0;
  right: 0;
  text-align: center;
  font-family: var(--mono);
  font-size: 8.5px;
  letter-spacing: 0.02em;
  color: var(--vcolor, #6e737a);
  opacity: 0;
}
.cell.on .tag { opacity: 1; }
.rail[data-voice="sub"] .cell .tag { font-size: 10px; }

.ph {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 12px;
  width: 24px;
  background: rgba(255, 171, 61, 0.16);
  border-left: 1px solid rgba(255, 171, 61, 0.75);
  pointer-events: none;
  z-index: 2;
}

.stagefoot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 2px 0;
}
.hint {
  margin: 0;
  color: var(--dim);
  font-size: 11.5px;
  letter-spacing: 0.02em;
}
.hint.empty { color: var(--live); }
.pend {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--live);
  border: 1px solid rgba(255, 171, 61, 0.5);
  border-radius: 2px;
  padding: 3px 8px;
  white-space: nowrap;
}
.pend[hidden] { display: none; }

/* ------------------------------------------------------------------- rack */

.rack {
  border-left: 1px solid var(--line);
  background: var(--panel);
  overflow-y: auto;
  min-height: 0;
}

.panel { border-bottom: 1px solid var(--line-soft); }
.panel > summary {
  list-style: none;
  cursor: pointer;
  padding: 13px 16px 9px;
}
.panel > summary::-webkit-details-marker { display: none; }
.panel h2 {
  margin: 0;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--dim);
}
.voicename { color: var(--fg); letter-spacing: 0.06em; }
.panel > div, .panel > .note, .panel > .scope { margin: 0 16px 12px; }

.row { display: flex; gap: 8px; margin: 0 16px 8px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 0 16px 8px; }

.ghost {
  flex: 1;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel-2);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  cursor: pointer;
  text-align: center;
}
.ghost:hover { border-color: #3c4249; background: #1b1f23; }
.ghost.primary { border-color: var(--live); color: var(--live); }
.ghost.wide { flex: 1; }
.ghost .sub { display: block; font-size: 8.5px; color: var(--dim); letter-spacing: 0.04em; margin-top: 2px; }

.filebtn {
  flex: 1;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel-2);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  cursor: pointer;
}
.filebtn:hover { border-color: #3c4249; }

.slots { display: flex; gap: 8px; margin: 0 16px 8px; }
.slots button {
  flex: 1;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel-2);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  cursor: pointer;
}
.slots button[aria-pressed="true"] { border-color: var(--live); color: var(--live); background: #1d1810; }

.note {
  font-size: 11px;
  line-height: 1.45;
  color: var(--dim);
  padding-bottom: 10px;
}

.scope {
  position: relative;
  height: 46px;
  border: 1px solid var(--line-soft);
  border-radius: 3px;
  background: #0c0e11;
}
.scope canvas { width: 100%; height: 100%; display: block; }
.scopelabel {
  position: absolute;
  right: 6px;
  bottom: 3px;
  font-family: var(--mono);
  font-size: 8.5px;
  color: var(--dim);
}

.ctls { display: flex; flex-direction: column; gap: 2px; }
.ctl { margin-bottom: 2px; }
.ctl .k { grid-column: 1; }
.ctl input[type="range"] { grid-column: 2; }
.ctl .v { grid-column: 3; font-family: var(--mono); font-size: 11px; text-align: right; }
select {
  grid-column: 2 / span 2;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 5px 6px;
  font-family: var(--mono);
  font-size: 11px;
}

/* ----------------------------------------------------------------- mobile */

@media (min-width: 901px) {
  /* The instrument is one screen: stage stays put, the rack scrolls inside. */
  body { height: 100vh; overflow: hidden; }
  main { overflow: hidden; }
}

@media (max-width: 900px) {
  body { height: auto; overflow: visible; }
  .topbar {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 12px 14px;
  }
  .brand h1 { font-size: 17px; }
  .transport { flex-wrap: wrap; gap: 10px; }
  .master { justify-self: stretch; min-width: 0; }
  .ctl { grid-template-columns: 52px minmax(0, 1fr) 44px; }

  main { grid-template-columns: minmax(0, 1fr); }
  .rack { border-left: 0; border-top: 1px solid var(--line); overflow: visible; }

  .stage { padding: 12px 12px 8px; }
  .railscroll { overflow-x: auto; -webkit-overflow-scrolling: touch; flex: 0 0 auto; }
  .rails { --gutter: 86px; grid-auto-rows: minmax(56px, auto); }
  .gutter { padding: 8px; }
  .cells { grid-template-columns: repeat(32, 30px); padding: 8px 10px; }
  .cell { min-height: 40px; }
  .stagefoot { flex-direction: column; align-items: flex-start; gap: 8px; }
  .hint { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}