:root {
  --bg: #080810;
  --surface: #10101e;
  --surface2: #18182a;
  --border: #252540;
  --accent: #e0047a;
  --accent2: #00d4ff;
  --text: #e0e0f0;
  --muted: #60607a;
  --glow-pink: 0 0 16px rgba(224,4,122,0.55), 0 0 36px rgba(224,4,122,0.2);
  --glow-cyan: 0 0 16px rgba(0,212,255,0.55), 0 0 36px rgba(0,212,255,0.2);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Rajdhani', sans-serif;
  min-height: 100vh;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 36px 20px 52px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ── Header ── */
header { text-align: center; }

h1 {
  font-family: 'Orbitron', sans-serif;
  font-size: clamp(2rem, 6vw, 3.4rem);
  font-weight: 900;
  letter-spacing: 0.25em;
  color: var(--text);
  text-shadow: 0 0 30px rgba(224,4,122,0.5);
}

h1 .accent {
  color: var(--accent);
  text-shadow: var(--glow-pink);
}

.subtitle {
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  margin-top: 6px;
}

/* ── Visualizer ── */
#visualizer {
  width: 100%;
  height: 72px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  display: block;
}

/* ── Drum Pads ── */
.pads-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 20px;
}

.set {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.drum {
  position: relative;
  width: 126px;
  height: 126px;
  border-radius: 14px;
  border: 2px solid var(--border);
  background-color: var(--surface2);
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: transform 0.09s ease, border-color 0.15s, box-shadow 0.15s;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
}

/* Dark gradient so text is readable over drum images */
.drum::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.05) 30%, rgba(0,0,0,0.72) 100%);
  border-radius: inherit;
  pointer-events: none;
}

.drum .key {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -60%);
  font-family: 'Orbitron', sans-serif;
  font-size: 3.6rem;
  font-weight: 900;
  color: var(--text);
  text-shadow: 3px 0 var(--accent);
  letter-spacing: 0.05em;
  line-height: 1;
  user-select: none;
  z-index: 1;
}

.drum .name {
  position: absolute;
  bottom: 9px;
  left: 0;
  right: 0;
  text-align: center;
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.8);
  text-transform: uppercase;
  z-index: 1;
}

.drum:hover {
  border-color: var(--accent);
  box-shadow: var(--glow-pink);
  transform: translateY(-2px) scale(1.03);
}

.drum.pressed {
  border-color: var(--accent2);
  box-shadow: var(--glow-cyan);
  transform: scale(0.93);
  transition: transform 0.05s ease;
}

.drum.pressed::before {
  background: linear-gradient(to bottom, rgba(0,212,255,0.18), rgba(0,0,12,0.5));
}

/* Drum background images */
.w { background-image: url("images/tom1.png"); }
.a { background-image: url("images/tom2.png"); }
.s { background-image: url("images/tom3.png"); }
.d { background-image: url("images/tom4.png"); }
.j { background-image: url("images/crash.png"); }
.k { background-image: url("images/kick.png"); }
.l { background-image: url("images/snare.png"); }

/* ── Controls ── */
.controls {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 28px;
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  align-items: center;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-width: 130px;
}

.control-group label {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

#bpm-display {
  color: var(--accent2);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: var(--glow-pink);
  cursor: pointer;
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover { transform: scale(1.25); }

.toggle-group { align-items: flex-start; }

.toggle-btn {
  background: var(--surface2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 26px;
  font-family: 'Orbitron', sans-serif;
  font-size: 0.58rem;
  letter-spacing: 0.15em;
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn:hover { color: var(--text); border-color: var(--muted); }

.toggle-btn.active {
  color: var(--accent2);
  border-color: var(--accent2);
  background: rgba(0,212,255,0.08);
  box-shadow: var(--glow-cyan);
}

/* ── Sequencer ── */
.sequencer {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px 24px;
}

.seq-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 12px;
}

.seq-header h2 {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.62rem;
  letter-spacing: 0.22em;
  color: var(--muted);
}

.seq-controls { display: flex; gap: 8px; }

.seq-btn {
  font-family: 'Orbitron', sans-serif;
  font-size: 0.54rem;
  letter-spacing: 0.1em;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid;
  cursor: pointer;
  transition: all 0.15s;
  background: transparent;
}

.seq-btn.play { color: var(--accent); border-color: var(--accent); }
.seq-btn.play:hover,
.seq-btn.play.active { background: rgba(224,4,122,0.14); box-shadow: var(--glow-pink); }

.seq-btn.stop { color: #ff6432; border-color: #ff6432; }
.seq-btn.stop:hover { background: rgba(255,100,50,0.12); box-shadow: 0 0 14px rgba(255,100,50,0.4); }

.seq-btn.clear { color: var(--muted); border-color: var(--border); }
.seq-btn.clear:hover { color: var(--text); border-color: var(--muted); }

/* Sequencer Grid */
.seq-grid {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.seq-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.seq-row-label {
  font-family: 'Rajdhani', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--muted);
  width: 48px;
  flex-shrink: 0;
  text-align: right;
  text-transform: uppercase;
}

.seq-steps {
  display: flex;
  gap: 3px;
  flex: 1;
}

.seq-step {
  flex: 1;
  height: 28px;
  min-width: 0;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  cursor: pointer;
  transition: background 0.08s, border-color 0.08s, box-shadow 0.08s;
}

/* Visual beat grouping: slightly wider gap after every 4th step */
.seq-step:nth-child(4n) { margin-right: 4px; }

.seq-step:hover { border-color: var(--muted); background: #1e1e32; }

.seq-step.active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(224,4,122,0.5);
}

.seq-step.cursor {
  border-color: var(--accent2);
  box-shadow: var(--glow-cyan);
}

.seq-step.active.cursor {
  background: #ff1aaa;
  border-color: #ff1aaa;
  box-shadow: 0 0 14px rgba(255,26,170,0.75);
}

/* ── Footer ── */
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  padding: 24px 0 32px;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .drum { width: 100px; height: 100px; }
  .controls { gap: 18px; }
  .seq-row-label { width: 38px; font-size: 0.6rem; }
  .seq-step { height: 22px; }
  .seq-steps { gap: 2px; }
  .seq-step:nth-child(4n) { margin-right: 3px; }
}