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

:root {
  --bg: #0f0f1a;
  --bg-dark: #08080e;
  --bg-row: #141428;
  --bg-row-alt: #181832;
  --bg-row-beat: #1c1c40;
  --bg-row-highlight: #24244a;
  --bg-cursor: #3a3a7a;
  --bg-playrow: #2a5a2a;
  --border: #2a2a5a;
  --text: #aaaacc;
  --text-bright: #ddddff;
  --text-dim: #555577;
  --text-note: #66ff66;
  --text-inst: #ffaa33;
  --text-vol: #33aaff;
  --text-fx: #ff66aa;
  --text-header: #88aaff;
  --accent: #4488ff;
  --rec-on: #ff3333;
  --rec-off: #664444;
  --btn-bg: #222244;
  --btn-hover: #333366;
  --btn-active: #4444aa;
  --scrollbar: #333366;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Press Start 2P', monospace;
  font-size: 10px;
  overflow: hidden;
  height: 100vh;
  user-select: none;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg-dark);
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

#header h1 {
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 2px;
}

#header label {
  font-size: 8px;
  color: var(--text-dim);
  margin-left: 12px;
}

#header select,
#header input {
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  background: var(--btn-bg);
  color: var(--text-bright);
  border: 1px solid var(--border);
  padding: 3px 4px;
  margin-left: 4px;
  outline: none;
}

#header input[type="number"] {
  width: 50px;
}

#song-title {
  width: 140px;
}

/* Transport */
#transport {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--bg-dark);
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
}

#transport button {
  font-family: 'Press Start 2P', monospace;
  font-size: 8px;
  padding: 5px 10px;
  background: var(--btn-bg);
  color: var(--text);
  border: 2px solid var(--border);
  cursor: pointer;
  transition: background 0.1s;
}

#transport button:hover {
  background: var(--btn-hover);
  color: var(--text-bright);
}

#transport button:active {
  background: var(--btn-active);
}

#btn-play {
  color: #66ff66;
}

#btn-stop {
  color: #ff6666;
}

#btn-rec.rec-on {
  background: var(--rec-on);
  color: #fff;
  border-color: #ff6666;
}

#btn-rec.rec-off {
  background: var(--rec-off);
  color: #aa6666;
}

#pattern-nav, #song-position {
  font-size: 9px;
  color: var(--text-header);
  display: flex;
  align-items: center;
  gap: 6px;
}

.transport-sep {
  color: var(--border);
  font-size: 12px;
}

#transport label {
  font-size: 8px;
  color: var(--text-dim);
}

#transport select {
  font-family: 'Press Start 2P', monospace;
  font-size: 7px;
  background: var(--btn-bg);
  color: var(--text-bright);
  border: 1px solid var(--border);
  padding: 3px 4px;
  margin-left: 4px;
  outline: none;
  max-width: 180px;
}

/* Main area */
#main-area {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Tracker */
#tracker-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 2px solid var(--border);
}

#channel-headers {
  display: flex;
  background: var(--bg-dark);
  border-bottom: 2px solid var(--border);
  flex-shrink: 0;
  padding-left: 30px; /* row number width */
}

.channel-header {
  flex: 1;
  text-align: center;
  padding: 6px 4px;
  font-size: 8px;
  color: var(--text-header);
  border-right: 1px solid var(--border);
  min-width: 140px;
  cursor: pointer;
}

.channel-header:hover {
  color: var(--text-bright);
}

.channel-header.muted {
  color: var(--text-dim);
  text-decoration: line-through;
}

#pattern-editor {
  flex: 1;
  overflow-y: auto;
  overflow-x: auto;
  position: relative;
}

#pattern-editor::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

#pattern-editor::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

#pattern-editor::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 0;
}

.pattern-row {
  display: flex;
  align-items: center;
  height: 18px;
  line-height: 18px;
}

.pattern-row:nth-child(even) {
  background: var(--bg-row-alt);
}

.pattern-row:nth-child(odd) {
  background: var(--bg-row);
}

.pattern-row.beat-row {
  background: var(--bg-row-beat);
}

.pattern-row.play-row {
  background: var(--bg-playrow) !important;
}

.row-number {
  width: 30px;
  text-align: right;
  padding-right: 6px;
  color: var(--text-dim);
  font-size: 8px;
  flex-shrink: 0;
}

.beat-row .row-number {
  color: var(--text-header);
}

.channel-cell {
  flex: 1;
  min-width: 140px;
  display: flex;
  gap: 0;
  padding: 0 2px;
  border-right: 1px solid #1a1a3a;
  font-size: 9px;
  cursor: pointer;
}

.cell-note {
  width: 32px;
  color: var(--text-note);
  text-align: center;
}

.cell-inst {
  width: 20px;
  color: var(--text-inst);
  text-align: center;
}

.cell-vol {
  width: 20px;
  color: var(--text-vol);
  text-align: center;
}

.cell-fx-type {
  width: 12px;
  color: var(--text-fx);
  text-align: center;
}

.cell-fx-val {
  width: 20px;
  color: var(--text-fx);
  text-align: center;
}

.cell-empty {
  color: var(--text-dim);
}

.cell-cursor {
  background: var(--bg-cursor);
  outline: 1px solid var(--accent);
}

/* Side panel */
#side-panel {
  width: 220px;
  background: var(--bg-dark);
  overflow-y: auto;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

#side-panel h2 {
  font-size: 9px;
  color: var(--text-header);
  padding: 8px;
  border-bottom: 1px solid var(--border);
}

#instrument-panel {
  border-bottom: 2px solid var(--border);
}

#inst-params {
  padding: 6px 8px;
}

.inst-param {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 7px;
}

.inst-param label {
  color: var(--text-dim);
}

.inst-param input,
.inst-param select {
  font-family: 'Press Start 2P', monospace;
  font-size: 7px;
  background: var(--btn-bg);
  color: var(--text-bright);
  border: 1px solid var(--border);
  padding: 2px 3px;
  width: 70px;
  outline: none;
}

.inst-param input[type="range"] {
  width: 70px;
  height: 8px;
  -webkit-appearance: none;
  background: var(--border);
  outline: none;
}

.inst-param input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 8px;
  height: 14px;
  background: var(--accent);
  cursor: pointer;
}

#inst-list {
  padding: 4px 8px 8px;
  max-height: 120px;
  overflow-y: auto;
}

.inst-item {
  font-size: 7px;
  padding: 3px 4px;
  cursor: pointer;
  color: var(--text-dim);
}

.inst-item:hover {
  color: var(--text);
}

.inst-item.selected {
  color: var(--text-inst);
  background: var(--bg-row-highlight);
}

/* Song order */
#song-order-panel {
  border-bottom: 2px solid var(--border);
}

#song-order-list {
  padding: 4px 8px 8px;
  max-height: 120px;
  overflow-y: auto;
}

.order-item {
  font-size: 8px;
  padding: 3px 4px;
  cursor: pointer;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

.order-item:hover {
  color: var(--text);
}

.order-item.current {
  color: var(--text-bright);
  background: var(--bg-row-highlight);
}

.order-item .order-remove {
  color: #ff4444;
  cursor: pointer;
  visibility: hidden;
}

.order-item:hover .order-remove {
  visibility: visible;
}

/* Help */
#help-panel {
  flex: 1;
}

.help-text {
  padding: 6px 8px;
  font-size: 7px;
  line-height: 1.8;
}

.help-text p {
  color: var(--text-dim);
}

/* Scrollbar for side panels */
#side-panel::-webkit-scrollbar,
#inst-list::-webkit-scrollbar,
#song-order-list::-webkit-scrollbar {
  width: 6px;
}

#side-panel::-webkit-scrollbar-track,
#inst-list::-webkit-scrollbar-track,
#song-order-list::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

#side-panel::-webkit-scrollbar-thumb,
#inst-list::-webkit-scrollbar-thumb,
#song-order-list::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
}