:root {
  --bg: #131519;
  --panel: #1e2126;
  --panel-edge: #2c313a;
  --ink: #d8dce2;
  --dim: #7d838d;
  --accent: #ff7a18;
  --red: #ff3b30;
  --orange: #ff9500;
  --yellow: #ffd23f;
  --cream: #f4ead5;
  --led: #5cff8a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  -webkit-user-select: none;
  user-select: none;
}

#app {
  max-width: 1180px;
  margin: 24px auto;
  padding: 0 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 14px;
}

/* ---------- header ---------- */

header {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: stretch;
}

.brand h1 {
  margin: 0;
  font-size: 30px;
  letter-spacing: 2px;
  color: var(--cream);
}
.brand h1 span { color: var(--accent); }
.brand .sub {
  font-size: 10px;
  letter-spacing: 4px;
  color: var(--dim);
}

.group {
  border-left: 1px solid var(--panel-edge);
  padding-left: 16px;
}
.group-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--dim);
  margin-bottom: 8px;
}
.group-body {
  display: flex;
  align-items: center;
  gap: 12px;
}

.big-btn {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  border: 1px solid var(--panel-edge);
  background: #262a31;
  color: var(--ink);
  font-size: 18px;
  cursor: pointer;
}
.big-btn.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1206;
  box-shadow: 0 0 14px rgba(255, 122, 24, 0.5);
}

.text-btn {
  border: 1px solid var(--panel-edge);
  background: #262a31;
  color: var(--ink);
  border-radius: 6px;
  padding: 8px 10px;
  font: inherit;
  font-size: 11px;
  letter-spacing: 1px;
  cursor: pointer;
}
.text-btn:hover { border-color: var(--dim); }
.text-btn:disabled { opacity: 0.5; cursor: wait; }
.text-btn.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1206;
}
.text-btn.small { padding: 5px 8px; }

.bpm-wrap { text-align: center; }
.bpm-wrap input {
  width: 58px;
  background: #11141a;
  border: 1px solid var(--panel-edge);
  border-radius: 6px;
  color: var(--led);
  font: inherit;
  font-size: 16px;
  text-align: center;
  padding: 6px 2px;
}

/* ---------- knobs ---------- */

.knob-wrap { text-align: center; width: 46px; }
.knob {
  width: 38px;
  height: 38px;
  margin: 0 auto;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #3a4049, #22262d 70%);
  border: 1px solid #41454e;
  position: relative;
  cursor: ns-resize;
  touch-action: none;
}
.knob-ind {
  position: absolute;
  inset: 0;
}
.knob-ind::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 3px;
  width: 3px;
  height: 12px;
  margin-left: -1.5px;
  border-radius: 2px;
  background: var(--accent);
}
.knob-label {
  margin-top: 4px;
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--dim);
}
.knob-value {
  font-size: 9px;
  color: var(--led);
  min-height: 11px;
}

/* ---------- pattern bar ---------- */

.pattern-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.pattern-bar .group:first-child { border-left: none; padding-left: 0; }

.pattern-btns {
  display: grid;
  grid-template-columns: repeat(8, 34px);
  gap: 5px;
}
.pat-btn {
  height: 26px;
  border-radius: 5px;
  border: 1px solid var(--panel-edge);
  background: #262a31;
  color: var(--dim);
  font: inherit;
  font-size: 10px;
  cursor: pointer;
  position: relative;
}
.pat-btn.has-data { color: var(--ink); }
.pat-btn.has-data::after {
  content: '';
  position: absolute;
  top: 3px;
  right: 3px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--led);
}
.pat-btn.selected {
  border-color: var(--accent);
  background: #33271c;
  color: var(--accent);
}
.pat-btn.live {
  box-shadow: 0 0 8px rgba(92, 255, 138, 0.7);
  border-color: var(--led);
}

.chain-view {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  min-width: 160px;
  max-width: 420px;
  min-height: 28px;
  padding: 3px 6px;
  background: #11141a;
  border: 1px solid var(--panel-edge);
  border-radius: 6px;
}
.chain-empty { color: var(--dim); font-size: 10px; }
.chain-chip {
  border: 1px solid var(--panel-edge);
  background: #262a31;
  color: var(--ink);
  border-radius: 4px;
  font: inherit;
  font-size: 10px;
  padding: 3px 6px;
  cursor: pointer;
}
.chain-chip:hover {
  border-color: var(--red);
  color: var(--red);
}

/* ---------- channels ---------- */

.channel {
  display: grid;
  grid-template-columns: 84px 160px 1fr;
  gap: 14px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--panel-edge);
}
.channel:last-child { border-bottom: none; }

.ch-name {
  border: 1px solid var(--panel-edge);
  background: #262a31;
  color: var(--cream);
  border-radius: 6px;
  font: inherit;
  font-size: 11px;
  letter-spacing: 1px;
  padding: 10px 4px;
  cursor: pointer;
}
.ch-name:active { background: var(--accent); color: #1a1206; }

.ch-knobs {
  display: flex;
  gap: 8px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 5px;
}
.step {
  height: 42px;
  border-radius: 5px;
  border: 1px solid var(--panel-edge);
  background: #20242b;
  cursor: pointer;
  position: relative;
}
.step::after {
  content: '';
  position: absolute;
  left: 20%;
  right: 20%;
  top: 6px;
  height: 4px;
  border-radius: 2px;
  opacity: 0.45;
}
.step.g0::after { background: var(--red); }
.step.g1::after { background: var(--orange); }
.step.g2::after { background: var(--yellow); }
.step.g3::after { background: var(--cream); }

.step.active.g0 { background: var(--red); border-color: var(--red); }
.step.active.g1 { background: var(--orange); border-color: var(--orange); }
.step.active.g2 { background: var(--yellow); border-color: var(--yellow); }
.step.active.g3 { background: var(--cream); border-color: var(--cream); }
.step.active::after { background: #1a1206; opacity: 0.6; }

.step.playhead {
  box-shadow: 0 0 0 2px var(--led);
}

/* every 4th step gets extra spacing, x0x style */
.steps .step:nth-child(4n+1) { margin-left: 4px; }
.steps .step:first-child { margin-left: 0; }

footer {
  text-align: center;
  color: var(--dim);
  font-size: 10px;
  letter-spacing: 1px;
  padding-bottom: 24px;
}

@media (max-width: 900px) {
  .channel { grid-template-columns: 70px 150px 1fr; }
  .step { height: 34px; }
}