:root {
  --bg: #0d0d1a;
  --bg2: #141428;
  --card: rgba(255,255,255,0.04);
  --text: #e8e8ff;
  --text2: #7a7aa0;
  --text3: #44445a;
  --accent: #8b5cf6;
  --accent2: #a78bfa;
  --border: rgba(255,255,255,0.06);
  --radius: 16px;
  --font: 'Inter', sans-serif;
  --transition: 0.2s ease;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: white; }

.app {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
}

.logo i { color: var(--accent); font-size: 1.5rem; }

.header-controls {
  display: flex;
  align-items: center;
  gap: 20px;
}

.bpm-control {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 12px;
}

.bpm-control label {
  font-size: 0.7rem;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.bpm-btn {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: rgba(255,255,255,0.06);
  border: none;
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  transition: var(--transition);
}

.bpm-btn:hover { background: var(--accent); color: white; }

.bpm-value {
  font-weight: 700;
  font-size: 1rem;
  min-width: 36px;
  text-align: center;
}

.master-vol {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text2);
}

.master-vol input[type="range"] {
  -webkit-appearance: none;
  width: 80px;
  height: 4px;
  background: var(--border);
  border-radius: 4px;
  outline: none;
}

.master-vol input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
}

/* Pack bar */
.pack-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.pack-btn {
  padding: 8px 18px;
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: 10px;
  cursor: pointer;
  transition: var(--transition);
}

.pack-btn:hover { color: var(--text); border-color: var(--accent); }
.pack-btn.active { background: var(--accent); color: white; border-color: var(--accent); }

/* Pad Grid */
.pad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.pad {
  aspect-ratio: 1;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.1s, box-shadow 0.2s, border-color 0.2s;
  position: relative;
  overflow: hidden;
  user-select: none;
}

.pad:hover {
  transform: scale(1.03);
  border-color: rgba(255,255,255,0.15);
}

.pad:active, .pad.active {
  transform: scale(0.95);
}

.pad.active::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.2);
  border-radius: var(--radius);
  animation: padFlash 0.3s ease-out;
}

@keyframes padFlash {
  from { opacity: 1; }
  to { opacity: 0; }
}

.pad .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  transform: scale(0);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}

@keyframes ripple {
  to { transform: scale(4); opacity: 0; }
}

.pad-key {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  opacity: 0.5;
  text-transform: uppercase;
}

.pad-label {
  font-size: 0.8rem;
  font-weight: 600;
}

.pad-icon {
  font-size: 1.5rem;
}

/* Colors for pads */
.pad[data-color="red"] { background: linear-gradient(135deg, #dc2626, #991b1b); }
.pad[data-color="orange"] { background: linear-gradient(135deg, #ea580c, #9a3412); }
.pad[data-color="amber"] { background: linear-gradient(135deg, #d97706, #92400e); }
.pad[data-color="yellow"] { background: linear-gradient(135deg, #ca8a04, #854d0e); }
.pad[data-color="lime"] { background: linear-gradient(135deg, #65a30d, #3f6212); }
.pad[data-color="green"] { background: linear-gradient(135deg, #16a34a, #166534); }
.pad[data-color="teal"] { background: linear-gradient(135deg, #0d9488, #115e59); }
.pad[data-color="cyan"] { background: linear-gradient(135deg, #0891b2, #155e75); }
.pad[data-color="blue"] { background: linear-gradient(135deg, #2563eb, #1e3a8a); }
.pad[data-color="indigo"] { background: linear-gradient(135deg, #4f46e5, #312e81); }
.pad[data-color="violet"] { background: linear-gradient(135deg, #7c3aed, #4c1d95); }
.pad[data-color="purple"] { background: linear-gradient(135deg, #9333ea, #581c87); }
.pad[data-color="fuchsia"] { background: linear-gradient(135deg, #c026d3, #701a75); }
.pad[data-color="pink"] { background: linear-gradient(135deg, #db2777, #831843); }
.pad[data-color="rose"] { background: linear-gradient(135deg, #e11d48, #881337); }
.pad[data-color="slate"] { background: linear-gradient(135deg, #475569, #1e293b); }

/* Sequencer */
.sequencer-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.seq-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.seq-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.seq-header h3 i { color: var(--accent); }

.seq-controls {
  display: flex;
  gap: 6px;
}

.seq-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  transition: var(--transition);
}

.seq-btn:hover { color: var(--accent); border-color: var(--accent); }

.sequencer {
  display: grid;
  grid-template-columns: 80px repeat(16, 1fr);
  gap: 3px;
  overflow-x: auto;
}

.seq-row-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text2);
  display: flex;
  align-items: center;
  padding: 0 8px;
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.seq-cell {
  aspect-ratio: 1;
  border-radius: 4px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  cursor: pointer;
  transition: background 0.1s, border-color 0.1s, box-shadow 0.1s;
  min-width: 28px;
  min-height: 28px;
}

.seq-cell:hover { background: rgba(255,255,255,0.1); }

.seq-cell.on {
  background: var(--accent);
  border-color: var(--accent2);
  box-shadow: 0 0 6px rgba(139,92,246,0.3);
}

.seq-cell.on.row-0 { background: #ef4444; border-color: #f87171; box-shadow: 0 0 6px rgba(239,68,68,0.4); }
.seq-cell.on.row-1 { background: #f59e0b; border-color: #fbbf24; box-shadow: 0 0 6px rgba(245,158,11,0.4); }
.seq-cell.on.row-2 { background: #06b6d4; border-color: #22d3ee; box-shadow: 0 0 6px rgba(6,182,212,0.4); }
.seq-cell.on.row-3 { background: #8b5cf6; border-color: #a78bfa; box-shadow: 0 0 6px rgba(139,92,246,0.4); }

.seq-cell.beat {
  border-color: #f59e0b;
  box-shadow: 0 0 12px rgba(245,158,11,0.5);
}

.seq-cell.on.beat {
  background: #f59e0b;
  border-color: #fbbf24;
  box-shadow: 0 0 16px rgba(245,158,11,0.7);
  transform: scale(1.1);
}

/* Generator */
.generator-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

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

.gen-header h3 {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.gen-header h3 i { color: #f59e0b; }

.gen-controls {
  display: flex;
  gap: 6px;
  align-items: center;
}

.gen-controls select {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  outline: none;
}

.gen-controls select option { background: var(--bg); }

.gen-btn {
  padding: 8px 16px;
  border-radius: 8px;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  border: none;
  color: white;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.gen-btn:hover { transform: translateY(-1px); filter: brightness(1.1); }

.gen-play, .gen-stop {
  width: 36px;
  padding: 8px;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text2);
}

.gen-play:hover, .gen-stop:hover { color: var(--accent); border-color: var(--accent); }

/* Record */
.record-section {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
}

.record-btn, .play-rec-btn {
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.record-btn {
  background: rgba(239,68,68,0.15);
  color: #ef4444;
  border-color: rgba(239,68,68,0.3);
}

.record-btn:hover { background: rgba(239,68,68,0.25); }
.record-btn.recording {
  background: #ef4444;
  color: white;
  animation: recPulse 1s infinite;
}

@keyframes recPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239,68,68,0.4); }
  50% { box-shadow: 0 0 0 8px rgba(239,68,68,0); }
}

.play-rec-btn {
  background: var(--card);
  color: var(--text2);
}

.play-rec-btn:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.play-rec-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* Footer */
.footer {
  text-align: center;
  padding: 16px 0;
  font-size: 0.8rem;
  color: var(--text3);
}

.footer a { color: var(--accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 600px) {
  .pad-grid { grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .pad-icon { font-size: 1.2rem; }
  .pad-label { font-size: 0.7rem; }
  .header { flex-direction: column; align-items: flex-start; }
  .sequencer { grid-template-columns: 60px repeat(16, 1fr); }
}