/* ═══════════════════════════════════════════════════════════════
   MusicBox — Design System & Full UI Styles
   Dark hardware aesthetic · LED buttons · Glassmorphism panels
   ═══════════════════════════════════════════════════════════════ */

/* ─── CSS Custom Properties ────────────────────────────────── */
:root {
  /* Colors */
  --bg-deep:        #080b0f;
  --bg-base:        #0d1117;
  --bg-surface:     #141920;
  --bg-elevated:    #1c2430;
  --bg-panel:       rgba(20, 25, 32, 0.92);
  --bg-glass:       rgba(255,255,255,0.04);

  --border-subtle:  rgba(255,255,255,0.07);
  --border-muted:   rgba(255,255,255,0.12);
  --border-active:  rgba(255,255,255,0.25);

  --text-primary:   #e8edf5;
  --text-secondary: #8a99b0;
  --text-muted:     #4a5568;
  --text-accent:    #00d4ff;

  /* Genre accent colors */
  --accent-cyan:    #00d4ff;
  --accent-green:   #00ff88;
  --accent-amber:   #ffaa00;
  --accent-purple:  #c084fc;
  --accent-red:     #ff4444;
  --accent-pink:    #ff6eb4;
  --accent-orange:  #ff7a1a;

  /* LED states */
  --led-off:        #0d1820;
  --led-on-cyan:    #00d4ff;
  --led-on-green:   #00ff88;
  --led-on-amber:   #ffaa00;
  --led-on-red:     #ff4444;
  --led-playhead:   rgba(0,212,255,0.2);

  /* Track colors */
  --track-1: #00d4ff;
  --track-2: #00ff88;
  --track-3: #ffaa00;
  --track-4: #c084fc;
  --track-5: #ff6eb4;
  --track-6: #ff7a1a;
  --track-7: #7df3e1;
  --track-8: #a78bfa;

  /* Dimensions */
  --header-h:       64px;
  --sidebar-left-w: 260px;
  --sidebar-right-w: 240px;
  --step-btn-size:  34px;
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      16px;

  /* Typography */
  --font-ui:   'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* ─── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

/* Scrollbar */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-muted); border-radius: 99px; }

/* ─── HEADER ────────────────────────────────────────────────── */
.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 20px;
  background: rgba(8,11,15,0.96);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  z-index: 100;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.logo-icon {
  font-size: 22px;
  color: var(--accent-cyan);
  filter: drop-shadow(0 0 8px var(--accent-cyan));
  animation: pulse-icon 3s ease-in-out infinite;
}

@keyframes pulse-icon {
  0%, 100% { filter: drop-shadow(0 0 6px var(--accent-cyan)); }
  50%       { filter: drop-shadow(0 0 16px var(--accent-cyan)); }
}

.logo-text {
  font-family: var(--font-mono);
  font-size: 17px;
  letter-spacing: 3px;
  color: var(--text-secondary);
}

.logo-text strong {
  color: var(--text-primary);
  font-weight: 700;
}

.logo-version {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Transport */
.transport {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.btn-transport {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-muted);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-transport:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
  background: var(--bg-glass);
}

.btn-transport.btn-play.active {
  color: var(--accent-green);
  border-color: var(--accent-green);
  box-shadow: 0 0 12px rgba(0,255,136,0.3);
}

.btn-transport.btn-record.active {
  color: var(--accent-red);
  border-color: var(--accent-red);
  box-shadow: 0 0 12px rgba(255,68,68,0.4);
  animation: blink-record 1s step-start infinite;
}

@keyframes blink-record {
  50% { opacity: 0.4; }
}

/* BPM Block */
.bpm-block {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
}

.bpm-block label,
.swing-block label,
.step-count-block label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--text-muted);
  text-transform: uppercase;
}

.bpm-block input[type="number"] {
  width: 52px;
  background: transparent;
  border: none;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  outline: none;
  -moz-appearance: textfield;
}

.bpm-block input[type="number"]::-webkit-inner-spin-button,
.bpm-block input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }

.bpm-arrows {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.bpm-arrows button {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 9px;
  cursor: pointer;
  padding: 1px 4px;
  line-height: 1;
  transition: color 0.1s;
}
.bpm-arrows button:hover { color: var(--accent-cyan); }

.tap-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 5px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.1s;
}
.tap-btn:active {
  background: var(--accent-cyan);
  color: var(--bg-deep);
  border-color: var(--accent-cyan);
}

/* Swing */
.swing-block {
  display: flex;
  align-items: center;
  gap: 8px;
}

.swing-block input[type="range"] {
  -webkit-appearance: none;
  width: 80px;
  height: 3px;
  background: var(--bg-elevated);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}
.swing-block input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent-amber);
  box-shadow: 0 0 8px rgba(255,170,0,0.5);
}

.swing-block span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-amber);
  min-width: 30px;
}

/* Step count */
.step-count-block {
  display: flex;
  align-items: center;
  gap: 6px;
}

.step-count-block select {
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 8px;
  outline: none;
  cursor: pointer;
}

/* Header right */
.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.midi-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  padding: 5px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.midi-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.3s;
}

.midi-dot.connected {
  background: var(--accent-green);
  box-shadow: 0 0 8px rgba(0,255,136,0.6);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 4px rgba(0,255,136,0.5); }
  50%       { box-shadow: 0 0 14px rgba(0,255,136,0.9); }
}

.icon-btn {
  height: 34px;
  padding: 0 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.icon-btn:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
  background: var(--bg-glass);
}

/* ─── MAIN LAYOUT ──────────────────────────────────────────── */
.app-main {
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0; bottom: 0;
  display: grid;
  grid-template-columns: var(--sidebar-left-w) 1fr var(--sidebar-right-w);
  overflow: hidden;
}

/* ─── PANELS ────────────────────────────────────────────────── */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-muted);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-title .panel-icon {
  font-size: 13px;
}

/* ─── SIDEBARS ──────────────────────────────────────────────── */
.sidebar-left,
.sidebar-right {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 10px;
  overflow-y: auto;
  background: rgba(8,11,15,0.5);
  border-right: 1px solid var(--border-subtle);
}

.sidebar-right {
  border-right: none;
  border-left: 1px solid var(--border-subtle);
}

/* ─── MIDI PANEL ────────────────────────────────────────────── */
.device-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 40px;
}

.no-devices {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  padding: 8px;
}

.device-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 11px;
  transition: border-color 0.2s;
}

.device-item.active {
  border-color: var(--accent-cyan);
  background: rgba(0,212,255,0.05);
}

.device-icon { font-size: 16px; }

.device-info { flex: 1; overflow: hidden; }

.device-name {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.device-type {
  font-size: 9px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.device-ch-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 4px;
  width: 44px;
}

/* MIDI Monitor */
.midi-monitor {
  background: var(--bg-deep);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex: 1;
}

.monitor-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 8px;
  background: var(--bg-elevated);
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.monitor-log {
  height: 100px;
  overflow-y: auto;
  padding: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.monitor-entry { display: flex; gap: 6px; }
.monitor-time { color: var(--text-muted); }
.monitor-note-on  { color: var(--accent-green); }
.monitor-note-off { color: var(--text-muted); }
.monitor-cc       { color: var(--accent-amber); }
.monitor-clock    { color: var(--text-muted); opacity: 0.4; }

/* ─── PRESET GRID ───────────────────────────────────────────── */
.preset-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.preset-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-ui);
}

.preset-btn:hover {
  transform: translateY(-2px);
  border-color: var(--preset-color, var(--accent-cyan));
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.preset-btn.active {
  border-color: var(--preset-color, var(--accent-cyan));
  background: rgba(var(--preset-color-rgb, 0,212,255), 0.1);
  box-shadow: 0 0 16px rgba(var(--preset-color-rgb, 0,212,255), 0.2);
}

.preset-icon { font-size: 20px; }
.preset-name {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.preset-bpm {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
}

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

/* ─── BUTTONS ───────────────────────────────────────────────── */
.btn-primary {
  padding: 8px 18px;
  background: var(--accent-cyan);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--bg-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-primary:hover {
  background: #33deff;
  box-shadow: 0 0 20px rgba(0,212,255,0.4);
}

.btn-secondary {
  flex: 1;
  padding: 7px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.btn-tiny {
  padding: 2px 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  color: var(--text-muted);
  font-size: 9px;
  cursor: pointer;
  transition: all 0.1s;
}
.btn-tiny:hover { color: var(--text-primary); }

/* ─── SEQUENCER AREA ────────────────────────────────────────── */
.sequencer-area {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 10px;
  gap: 8px;
}

.sequencer-header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.step-indicator-row {
  display: flex;
  gap: 2px;
  flex: 1;
  padding-left: 220px; /* align with track steps */
}

.step-indicator {
  flex: 1;
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 99px;
  font-family: var(--font-mono);
  font-size: 8px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.05s;
}

.step-indicator.playhead {
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
}

.step-indicator.bar-start {
  background: var(--bg-elevated);
}

/* ─── TRACK LIST ────────────────────────────────────────────── */
.track-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
  flex: 1;
}

.track-row {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 6px 8px;
  transition: border-color 0.2s;
  flex-shrink: 0;
}

.track-row:hover {
  border-color: var(--border-muted);
}

.track-row.muted {
  opacity: 0.35;
}

.track-row.soloed {
  border-color: var(--accent-amber);
  background: rgba(255,170,0,0.04);
}

/* Track header (left side, 220px wide) */
.track-header {
  width: 220px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}

.track-color-bar {
  width: 3px;
  height: 36px;
  border-radius: 99px;
  flex-shrink: 0;
}

.track-info {
  flex: 1;
  overflow: hidden;
}

.track-name {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: text;
  outline: none;
}

.track-name:focus {
  background: var(--bg-elevated);
  border-radius: 3px;
  padding: 0 4px;
}

.track-meta {
  font-size: 9px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* Track controls */
.track-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.track-btn {
  width: 24px; height: 24px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 9px;
  font-weight: 700;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: all 0.1s;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.track-btn.mute-btn.active {
  background: rgba(255,68,68,0.2);
  border-color: var(--accent-red);
  color: var(--accent-red);
}

.track-btn.solo-btn.active {
  background: rgba(255,170,0,0.2);
  border-color: var(--accent-amber);
  color: var(--accent-amber);
}

.track-ch-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 2px 4px;
  width: 36px;
  cursor: pointer;
}

/* MIDI activity LED */
.track-activity {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--led-off);
  flex-shrink: 0;
  transition: background 0.05s, box-shadow 0.05s;
}

.track-activity.active {
  background: var(--track-color, var(--accent-cyan));
  box-shadow: 0 0 8px var(--track-color, var(--accent-cyan));
}

/* ─── STEP BUTTONS ─────────────────────────────────────────── */
.steps-grid {
  display: flex;
  gap: 2px;
  flex: 1;
  align-items: center;
}

.step-btn {
  width: var(--step-btn-size);
  height: var(--step-btn-size);
  flex: 1;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: var(--led-off);
  cursor: pointer;
  transition: all 0.05s;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  overflow: hidden;
}

.step-btn::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: var(--vel-bar, 0%);
  background: var(--track-color, var(--accent-cyan));
  opacity: 0.25;
  transition: height 0.1s;
}

.step-btn.active {
  border-color: var(--track-color, var(--accent-cyan));
  background: rgba(var(--track-color-rgb, 0,212,255), 0.15);
}

.step-btn.active::before {
  opacity: 0.4;
}

.step-btn.playhead-active {
  border-color: var(--accent-cyan) !important;
  box-shadow: 0 0 10px rgba(0,212,255,0.6);
  z-index: 1;
}

.step-btn.active.playhead-active {
  background: rgba(0,212,255,0.3) !important;
  box-shadow: 0 0 16px rgba(0,212,255,0.8);
}

.step-btn:hover:not(.active) {
  border-color: var(--border-muted);
  background: var(--bg-elevated);
}

/* Step note label */
.step-note-label {
  font-family: var(--font-mono);
  font-size: 7px;
  color: var(--track-color, var(--accent-cyan));
  opacity: 0;
  transition: opacity 0.1s;
  pointer-events: none;
  z-index: 1;
}

.step-btn.active .step-note-label { opacity: 0.9; }

/* Probability dot */
.step-prob-dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--accent-amber);
  opacity: 0;
  z-index: 1;
}

.step-btn.has-prob .step-prob-dot { opacity: 0.8; }

/* Bar dividers */
.step-btn:nth-child(4n+1):not(:first-child)::after {
  content: '';
  position: absolute;
  left: -2px;
  top: 20%; bottom: 20%;
  width: 1px;
  background: var(--border-muted);
}

/* ── Accent: amber top border + glow ─────────────────────────── */
.step-btn.step-accent {
  border-top: 2px solid var(--accent-amber) !important;
  box-shadow: 0 0 8px rgba(255,170,0,0.35);
}
.step-btn.step-accent .step-note-label {
  color: var(--accent-amber);
}

/* ── Slide: right-arrow pip in top-right corner ─────────────── */
.step-btn.step-slide::after {
  content: '→';
  position: absolute;
  top: 1px; right: 2px;
  font-size: 7px;
  line-height: 1;
  color: var(--accent-green);
  opacity: 0.9;
  pointer-events: none;
  z-index: 2;
}

/* ── Device cards (MIDI panel) ──────────────────────────────── */
.device-card {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 4px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  font-size: 11px;
  transition: border-color 0.2s, background 0.2s;
}
.device-card-name {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
}
.device-card-desc {
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.device-card-status {
  display: flex;
  align-items: center;
  gap: 4px;
}
.device-status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.device-status-dot.online {
  background: var(--accent-green);
  box-shadow: 0 0 6px rgba(0,255,136,0.7);
  animation: pulse-dot 2s ease-in-out infinite;
}
.device-status-dot.offline {
  background: var(--text-muted);
}
.device-status-text {
  font-family: var(--font-mono);
  font-size: 8px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.device-card.device-connected {
  border-color: rgba(0,255,136,0.2);
}
.device-card.device-offline {
  opacity: 0.55;
}

/* ── Step editor accent/slide flag row ──────────────────────── */
.se-flags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.se-flag-label {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-elevated);
  cursor: pointer;
  font-size: 11px;
  color: var(--text-muted);
  transition: all 0.15s;
  user-select: none;
}
.se-flag-label input[type="checkbox"] {
  width: 12px; height: 12px;
  accent-color: var(--accent-amber);
  cursor: pointer;
}
.se-flag-label:hover {
  border-color: var(--border-muted);
  color: var(--text-primary);
}
.se-flag-label.flag-on {
  border-color: var(--accent-amber);
  background: rgba(255,170,0,0.1);
  color: var(--accent-amber);
}


/* ─── MIXER ─────────────────────────────────────────────────── */
.mixer-tracks {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mixer-track {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}

.mixer-color-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.mixer-track-name {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mixer-fader {
  -webkit-appearance: none;
  width: 80px;
  height: 3px;
  background: var(--border-muted);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}

.mixer-fader::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: background 0.1s;
}

.mixer-fader:hover::-webkit-slider-thumb {
  background: var(--text-primary);
}

.mixer-vol-val {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  min-width: 28px;
  text-align: right;
}

/* ─── STEP EDITOR ───────────────────────────────────────────── */
.step-editor-content {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hint-text {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  padding: 8px;
}

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

.se-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--text-muted);
  text-transform: uppercase;
  width: 70px;
  flex-shrink: 0;
}

.se-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-cyan);
}

.se-slider {
  -webkit-appearance: none;
  flex: 1;
  height: 3px;
  background: var(--border-muted);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}

.se-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 6px rgba(0,212,255,0.4);
}

.se-select {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 6px;
}

/* ─── KEYBOARD VISUALIZER ───────────────────────────────────── */
.keyboard-wrap {
  display: flex;
  position: relative;
  height: 70px;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.key {
  flex: 1;
  background: #e8edf5;
  border-right: 1px solid #bcc5d0;
  border-bottom: 1px solid #9aa3b0;
  border-radius: 0 0 4px 4px;
  cursor: pointer;
  transition: background 0.05s;
  position: relative;
}

.key:first-child { border-radius: 2px 0 0 4px; }

.key.black-key {
  position: absolute;
  width: 60%;
  height: 65%;
  background: #1a2030;
  border: 1px solid #0d1117;
  border-top: none;
  border-radius: 0 0 3px 3px;
  z-index: 2;
  cursor: pointer;
}

.key.active-key {
  background: var(--accent-cyan) !important;
  box-shadow: 0 2px 8px rgba(0,212,255,0.5);
}

.key.black-key.active-key {
  background: var(--accent-cyan) !important;
}

/* ─── MODAL ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fade-in 0.15s ease;
}

.modal-overlay[hidden] { display: none; }

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-width: 380px;
  max-width: 540px;
  box-shadow: 0 32px 64px rgba(0,0,0,0.6);
  animation: slide-up 0.2s ease;
}

@keyframes slide-up {
  from { transform: translateY(16px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.modal-box h3 {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 16px;
}

/* Note picker grid */
.note-picker-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 4px;
  margin-bottom: 20px;
}

.note-picker-btn {
  padding: 6px 2px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 8px;
  cursor: pointer;
  text-align: center;
  transition: all 0.1s;
}

.note-picker-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.note-picker-btn.selected {
  background: var(--accent-cyan);
  border-color: var(--accent-cyan);
  color: var(--bg-deep);
  font-weight: 700;
}

.note-picker-btn.sharp {
  background: var(--bg-deep);
  color: var(--text-muted);
}

.note-picker-btn.sharp.selected {
  background: var(--accent-cyan);
  color: var(--bg-deep);
}

/* Octave row */
.octave-row {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.octave-btn {
  flex: 1;
  padding: 5px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  cursor: pointer;
  transition: all 0.1s;
}

.octave-btn.selected {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(0,212,255,0.1);
}

/* Step params */
.step-params {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.step-params label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-secondary);
}

.step-params input[type="range"] {
  -webkit-appearance: none;
  flex: 1;
  height: 3px;
  background: var(--border-muted);
  border-radius: 99px;
  outline: none;
}

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

.step-params select {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 6px;
}

.step-params span {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  min-width: 35px;
  text-align: right;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* ─── TOAST ─────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-md);
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-primary);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  z-index: 300;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  white-space: nowrap;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.success { border-color: var(--accent-green); color: var(--accent-green); }
.toast.error   { border-color: var(--accent-red);   color: var(--accent-red); }
.toast.info    { border-color: var(--accent-cyan);   color: var(--accent-cyan); }

/* ─── SCROLLBAR FINE-TUNING ─────────────────────────────────── */
.sidebar-left::-webkit-scrollbar,
.sidebar-right::-webkit-scrollbar,
.track-list::-webkit-scrollbar { width: 4px; }

/* ─── TRACK COLORS ──────────────────────────────────────────── */
.track-color-1 { --track-color: var(--track-1); --track-color-rgb: 0,212,255; }
.track-color-2 { --track-color: var(--track-2); --track-color-rgb: 0,255,136; }
.track-color-3 { --track-color: var(--track-3); --track-color-rgb: 255,170,0; }
.track-color-4 { --track-color: var(--track-4); --track-color-rgb: 192,132,252; }
.track-color-5 { --track-color: var(--track-5); --track-color-rgb: 255,110,180; }
.track-color-6 { --track-color: var(--track-6); --track-color-rgb: 255,122,26; }
.track-color-7 { --track-color: var(--track-7); --track-color-rgb: 125,243,225; }
.track-color-8 { --track-color: var(--track-8); --track-color-rgb: 167,139,250; }

/* ─── UTILITY ───────────────────────────────────────────────── */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ─── ANIMATIONS ────────────────────────────────────────────── */
@keyframes flash-led {
  0%   { opacity: 1; }
  50%  { opacity: 0.4; }
  100% { opacity: 1; }
}

.step-btn.flash {
  animation: flash-led 0.12s ease;
}

/* ─── AUDIO CONTROLS (header) ──────────────────────────────── */
.audio-controls-block {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
}

.audio-toggle {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}

.audio-toggle.active {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: rgba(0,255,136,0.08);
  box-shadow: 0 0 10px rgba(0,255,136,0.2);
}

.audio-toggle:hover {
  border-color: var(--border-active);
  color: var(--text-primary);
}

.audio-toggle-icon { font-size: 14px; }

.audio-toggle-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1px;
  font-weight: 700;
}

.master-vol-block {
  display: flex;
  align-items: center;
  gap: 6px;
}

.master-vol-block label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--text-muted);
  text-transform: uppercase;
}

#master-vol {
  -webkit-appearance: none;
  width: 72px;
  height: 3px;
  background: var(--border-muted);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}

#master-vol::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 6px rgba(0,255,136,0.5);
  transition: box-shadow 0.1s;
}

#master-vol:hover::-webkit-slider-thumb {
  box-shadow: 0 0 12px rgba(0,255,136,0.8);
}

/* ─── INSTRUMENT PANEL ─────────────────────────────────────── */
.instrument-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.instr-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s;
}

.instr-row:hover {
  border-color: var(--border-muted);
}

.instr-color-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.instr-track-name {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-secondary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.instr-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 3px 5px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.1s;
}

.instr-select:hover {
  border-color: var(--border-active);
}

.instr-select:focus {
  border-color: var(--accent-cyan);
}

/* ─── SPATIAL FX PANEL ───────────────────────────────────────── */
.spatial-fx-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fx-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
}

.fx-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-secondary);
  width: 90px;
  flex-shrink: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.fx-slider {
  -webkit-appearance: none;
  flex: 1;
  height: 3px;
  background: var(--bg-surface);
  border-radius: 99px;
  outline: none;
  cursor: pointer;
}

.fx-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-pink);
  box-shadow: 0 0 6px rgba(255,110,180,0.6);
  transition: transform 0.1s;
}

.fx-slider::-webkit-slider-thumb:hover {
  transform: scale(1.3);
}

.fx-val {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent-pink);
  min-width: 32px;
  text-align: right;
}

.fx-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 4px;
  cursor: pointer;
  outline: none;
  flex: 1;
  transition: border-color 0.1s;
}

.fx-select:hover {
  border-color: var(--border-active);
}

/* ─── Transport Clock ────────────────────────────────────────── */
.transport-clock {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--accent-cyan);
  text-shadow: 0 0 12px rgba(0,212,255,0.7);
  background: rgba(0,212,255,0.06);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  min-width: 80px;
  text-align: center;
  user-select: none;
  flex-shrink: 0;
}

.clock-sep {
  color: rgba(0,212,255,0.4);
  margin: 0 1px;
}

/* ─── Save Slots ─────────────────────────────────────────────── */
.save-slots {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.slots-label {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-muted);
  letter-spacing: 1px;
  margin-right: 2px;
}

.slot-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--border-muted);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slot-btn:hover {
  border-color: var(--accent-amber);
  color: var(--accent-amber);
  box-shadow: 0 0 8px rgba(255,170,0,0.4);
}

.slot-btn.filled {
  border-color: var(--accent-amber);
  background: rgba(255,170,0,0.12);
  color: var(--accent-amber);
  box-shadow: 0 0 6px rgba(255,170,0,0.3);
}

/* Slot context menu */
.slot-menu {
  position: fixed;
  z-index: 500;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-md);
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  backdrop-filter: blur(10px);
  min-width: 160px;
}

.slot-menu[hidden] { display: none; }

.slot-menu-btn {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 12px;
  cursor: pointer;
  text-align: left;
  transition: background 0.1s;
}

.slot-menu-btn:hover {
  background: var(--bg-glass);
}

.slot-menu-cancel {
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  margin-top: 2px;
  padding-top: 10px;
}

/* ─── Undo Button ────────────────────────────────────────────── */
.undo-btn {
  font-size: 16px;
  transition: all 0.15s;
}

.undo-btn:not(:disabled):hover {
  color: var(--accent-cyan);
  text-shadow: 0 0 8px var(--accent-cyan);
}

.undo-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* ─── Help Button ────────────────────────────────────────────── */
.help-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--border-muted);
  font-size: 13px;
  font-weight: 700;
}

.help-btn:hover {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
  box-shadow: 0 0 8px rgba(192,132,252,0.4);
}

/* ─── Keyboard Shortcuts Modal ───────────────────────────────── */
.shortcuts-box {
  max-width: 420px;
}

.shortcuts-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 16px;
  margin: 16px 0;
  align-items: center;
}

kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-muted);
  border-bottom: 2px solid var(--border-active);
  border-radius: 4px;
  padding: 3px 7px;
  color: var(--accent-cyan);
  white-space: nowrap;
}

/* ─── VU Meters ──────────────────────────────────────────────── */
.mixer-fader-wrap {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.mixer-vu {
  height: 3px;
  border-radius: 99px;
  background: var(--bg-surface);
  overflow: hidden;
  position: relative;
}

.mixer-vu::after {
  content: '';
  position: absolute;
  inset-block: 0;
  left: 0;
  width: 0%;
  background: linear-gradient(to right, var(--accent-green), var(--accent-amber), var(--accent-red));
  border-radius: 99px;
  transition: width 0.15s ease-out;
}

.mixer-vu.vu-active::after {
  width: 100%;
}

.mixer-vu.vu-active {
  transition: none;
}

/* ─── Playable Piano Keys ────────────────────────────────────── */
.key {
  cursor: pointer;
  user-select: none;
  transition: filter 0.05s, transform 0.05s;
}

.white-key {
  border: 1px solid var(--border-subtle);
  border-top: none;
}

.white-key:hover {
  background: rgba(255,255,255,0.08) !important;
  filter: brightness(1.2);
}

.white-key:active,
.white-key.playing-key {
  background: rgba(0,212,255,0.15) !important;
  transform: scaleY(0.97);
  transform-origin: top center;
}

.black-key:hover {
  filter: brightness(1.5);
}

.black-key:active,
.black-key.playing-key {
  filter: brightness(2);
  transform: translateX(-50%) scaleY(0.95);
  transform-origin: top center;
}

/* ─── Step Editor Hint ───────────────────────────────────────── */
.hint-text {
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
  padding: 16px;
}

/* ─── About & Licence ────────────────────────────────────────── */
.about-box { max-width: 460px; }

.about-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 16px;
  margin: 16px 0;
  align-items: baseline;
}
.about-grid dt {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}
.about-grid dd {
  margin: 0;
  font-size: 13px;
  color: var(--text-primary);
}
.about-grid a {
  color: var(--accent-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 212, 255, 0.35);
}
.about-grid a:hover { border-bottom-color: var(--accent-cyan); }

.about-note {
  font-size: 11px;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  padding-top: 12px;
}