:root {
  --bg: #07080f;
  --panel: rgba(16, 18, 28, 0.86);
  --line: rgba(255, 255, 255, 0.08);
  --text: #f4f6ff;
  --muted: #8d95a8;
  --drums: #3ee0ff;
  --perc: #ff4d9a;
  --bass: #ffb020;
  --fx: #8dff6a;
  --danger: #ff3b5c;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 480px at 50% -10%, rgba(80, 60, 180, 0.35), transparent 60%),
    radial-gradient(700px 420px at 100% 100%, rgba(62, 224, 255, 0.08), transparent 50%),
    var(--bg);
}

.app {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 18px;
}

.top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 4px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 11px;
  color: var(--drums);
}

h1 {
  margin: 0;
  font-size: 40px;
  letter-spacing: -0.04em;
  line-height: 1;
}

.status {
  margin: 0;
  min-height: 1.4em;
  text-align: right;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 16px 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  backdrop-filter: blur(10px);
}

.transport-buttons {
  display: flex;
  gap: 8px;
}

.btn {
  border: 0;
  border-radius: 999px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 650;
  color: var(--text);
  background: #232636;
  cursor: pointer;
}

.btn:hover { filter: brightness(1.12); }
.btn:active { transform: translateY(1px); }

.btn.play.on,
.btn.record.hot {
  color: #14080c;
}

.btn.play.on { background: var(--drums); }

.btn.record.arm {
  background: #ffb020;
  color: #1a1000;
}

.btn.record.hot {
  background: var(--danger);
  animation: pulse 1s ease-in-out infinite;
}

.btn.ghost { background: transparent; border: 1px solid var(--line); }

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 130px;
  color: var(--muted);
  font-size: 13px;
}

.field strong { color: var(--text); font-variant-numeric: tabular-nums; }

input[type="range"] {
  width: 100%;
  accent-color: var(--drums);
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 6px;
  color: var(--muted);
  font-size: 14px;
  user-select: none;
}

.check input { accent-color: var(--drums); width: 16px; height: 16px; }

.seg {
  display: flex;
  padding: 3px;
  border-radius: 999px;
  background: #1a1d2a;
}

.seg button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  min-width: 36px;
  padding: 6px 10px;
  border-radius: 999px;
  cursor: pointer;
}

.seg button.on {
  background: var(--text);
  color: #12131b;
}

.beats {
  display: flex;
  justify-content: center;
  gap: 8px;
  min-height: 18px;
  margin: 18px 0 14px;
}

.beats span {
  width: 18px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
}

.beats span.accent { width: 26px; }

.beats span.on {
  background: var(--drums);
  box-shadow: 0 0 12px var(--drums);
}

.samples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 0 auto 14px;
}

.samples-label {
  margin-right: 4px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.samples button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  font: inherit;
  font-weight: 650;
  color: var(--text);
  background: #1a1d2a;
  cursor: pointer;
}

.samples button:hover { filter: brightness(1.12); }
.samples button:active { transform: translateY(1px); }

.samples button.on {
  background: var(--drums);
  color: #101218;
  border-color: transparent;
}

.sample-set {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.sample-set > button {
  border: 0;
  border-radius: 0;
}

.sample-set .learn {
  padding: 8px 10px;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.sample-set .learn.on {
  background: var(--fx);
  color: #101218;
}

.pad.next {
  animation: tutor 0.9s ease-in-out infinite;
}

@keyframes tutor {
  50% { box-shadow: 0 0 24px var(--c); }
}

.pads {
  --size: min(13.2dvh, calc((100vw - 64px) / 4), 156px);
  width: calc(var(--size) * 4 + 36px);
  max-width: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, var(--size));
  justify-content: center;
  gap: 12px;
}

.pad {
  --c: var(--drums);
  position: relative;
  width: var(--size);
  height: var(--size);
  border: 1px solid color-mix(in srgb, var(--c) 45%, transparent);
  border-radius: 18px;
  background:
    radial-gradient(120% 90% at 50% 0%, color-mix(in srgb, var(--c) 22%, transparent), transparent 55%),
    #12141e;
  color: var(--text);
  box-shadow: inset 0 0 30px color-mix(in srgb, var(--c) 10%, transparent);
  cursor: pointer;
  transition: transform 0.06s ease, background 0.06s ease, box-shadow 0.06s ease;
  touch-action: manipulation;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 12px;
  text-align: left;
}

.pad[data-group="drums"] { --c: var(--drums); }
.pad[data-group="perc"] { --c: var(--perc); }
.pad[data-group="bass"] { --c: var(--bass); }
.pad[data-group="fx"] { --c: var(--fx); }

.pad .key {
  position: absolute;
  top: 10px;
  left: 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--c) 80%, white);
}

.pad .name {
  font-size: clamp(15px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: -0.03em;
}

.pad .hint {
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.pad.lit {
  background: var(--c);
  color: #101218;
  transform: translateY(2px) scale(0.97);
  box-shadow: 0 0 28px color-mix(in srgb, var(--c) 75%, transparent);
}

.pad.lit .key,
.pad.lit .hint { color: rgba(10, 12, 18, 0.7); }

.help {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

kbd {
  display: inline-block;
  padding: 0 5px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  font-family: inherit;
  color: var(--text);
}

@keyframes pulse {
  50% { filter: brightness(1.25); }
}

@media (max-width: 720px) {
  .top { flex-direction: column; align-items: flex-start; }
  .status { text-align: left; }
  h1 { font-size: 34px; }
  .app { width: calc(100% - 20px); }
  .pads {
    --size: auto;
    width: 100%;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
  }
  .pad {
    width: auto;
    height: auto;
    aspect-ratio: 1;
    border-radius: 14px;
    padding: 8px;
  }
  .pad .name { font-size: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  .btn.record.hot,
  .pad.next { animation: none; }
}