:root {
  --bg: #0c0a0f;
  --surface: #171320;
  --surface2: #201b2e;
  --surface3: #2c2540;
  --accent: #d4163c;
  --accent2: #ff6b6b;
  --accent3: #ffa3a3;
  --green: #10b981;
  --red: #f43f5e;
  --orange: #fbbf24;
  --blue: #38bdf8;
  --pink: #f472b6;
  --text: #f1e8ff;
  --text-dim: #8b7fad;
  --text-dimmer: #5e5480;
  --border: #302848;
  --border-light: #403660;
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

#app { max-width: 1400px; margin: 0 auto; padding: 12px; }

/* ---- Header ---- */
header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 12px;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 10px;
}

h1 {
  font-size: 22px;
  background: linear-gradient(135deg, #d4163c, #fbbf24, #d4163c);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.author-tag {
  font-size: 11px;
  color: var(--text-dim);
  font-style: italic;
  letter-spacing: 0.5px;
}

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

.project-controls input {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 13px;
  width: 160px;
}

.transport {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ---- Buttons ---- */
.btn {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  transition: all .12s;
  white-space: nowrap;
}
.btn:hover { filter: brightness(1.15); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-play { background: var(--green); color: #000; }
.btn-play.active { background: var(--orange); animation: pulse 1s infinite; }

.btn-stop-t { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }

.btn-rec { background: var(--surface2); color: var(--text-dim); border: 1px solid var(--border); }
.btn-rec.active { background: var(--red); color: #fff; animation: pulse .5s infinite; border-color: var(--red); }

.btn-export { background: linear-gradient(135deg, var(--accent), #8b1028); color: #fff; }

.btn-util {
  background: var(--surface2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  padding: 6px 10px;
}
.btn-util.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.btn-sm {
  padding: 4px 10px;
  font-size: 11px;
  background: var(--surface2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}

.btn-xs {
  padding: 2px 7px;
  font-size: 11px;
  background: var(--surface2);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
}

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .6; } }

/* ---- Transport Controls ---- */
.pos-display {
  background: var(--bg);
  padding: 4px 12px;
  border-radius: 6px;
  font-family: 'Courier New', monospace;
  font-size: 16px;
  font-weight: 700;
  color: var(--green);
  min-width: 55px;
  text-align: center;
  border: 1px solid var(--border);
}

.tempo-ctrl, .swing-ctrl {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  padding: 4px 10px;
  border-radius: 6px;
}

.tempo-ctrl label, .swing-ctrl label {
  font-size: 10px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.tempo-ctrl span, .swing-ctrl span {
  font-size: 13px;
  font-weight: 700;
  min-width: 32px;
  color: var(--accent2);
}

/* ---- Inputs ---- */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
}

select {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 4px 8px;
  border-radius: 5px;
  font-size: 12px;
  cursor: pointer;
}

/* ---- Panels ---- */
.panel {
  background: var(--surface);
  border-radius: 10px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  cursor: pointer;
  user-select: none;
  background: var(--surface);
}

.panel-header:hover { background: var(--surface2); }

.panel-header h2 {
  font-size: 14px;
  color: var(--accent2);
}

.panel-ctrls {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
}

.panel-ctrls label {
  font-size: 12px;
  color: var(--text-dim);
}

.collapse-arrow {
  font-size: 10px;
  color: var(--text-dimmer);
  transition: transform .2s;
}

.collapse-arrow.up { transform: rotate(180deg); }

.panel-body {
  padding: 12px 16px;
}

.panel-body.collapsed { display: none; }

.sep { color: var(--border); margin: 0 2px; }

/* ---- Sequencer ---- */
.seq-scroll {
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 4px;
}

.seq-header {
  display: flex;
  align-items: center;
  margin-bottom: 3px;
  min-width: fit-content;
}

.track-label-spacer { width: 80px; flex-shrink: 0; }

.step-numbers { display: flex; gap: 2px; }

.step-numbers span {
  width: 24px;
  text-align: center;
  font-size: 9px;
  color: var(--text-dimmer);
  flex-shrink: 0;
}

.track-row {
  display: flex;
  align-items: center;
  margin-bottom: 2px;
  min-width: fit-content;
}

.track-label {
  width: 80px;
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  padding-right: 8px;
  text-align: right;
}

.steps { display: flex; gap: 2px; }

.step {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  background: var(--surface3);
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  transition: all .08s;
}

.step:hover { background: #2a2a42; }

.step.on {
  border-color: transparent;
  box-shadow: inset 0 0 8px rgba(255,255,255,.15);
}

.step.current {
  border: 2px solid var(--green) !important;
  box-shadow: 0 0 8px rgba(34,197,94,.4);
}

.step.beat-marker { background: rgba(212,22,60,.08); }

.track-kick .step.on { background: #dc2626; }
.track-snare .step.on { background: #f59e0b; }
.track-hihat .step.on { background: #22c55e; }
.track-openhat .step.on { background: #14b8a6; }
.track-clap .step.on { background: #ec4899; }
.track-tom .step.on { background: #8b5cf6; }
.track-rim .step.on { background: #06b6d4; }
.track-crash .step.on { background: #84cc16; }

/* ---- Piano Roll ---- */
.timeline-toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 10px;
}

.ctrl-grp {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.ctrl-grp label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-dim);
}

#pianoRollWrap {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  height: 340px;
}

#pianoRollKeys {
  width: 50px;
  flex-shrink: 0;
  background: var(--bg);
  overflow-y: auto;
  border-right: 2px solid var(--border);
  scrollbar-width: none;
}

#pianoRollKeys::-webkit-scrollbar { display: none; }

.pr-key {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 5px;
  font-size: 8px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  user-select: none;
}

.pr-key.white { background: #ddd; color: #333; }
.pr-key.black { background: #1a1a1a; color: #666; }
.pr-key.c-note { border-bottom: 2px solid var(--accent); }

#pianoRollGrid {
  flex: 1;
  overflow: auto;
  position: relative;
  background: var(--bg);
}

.pr-grid-inner {
  position: relative;
  min-width: 100%;
}

.pr-row {
  display: flex;
  border-bottom: 1px solid rgba(45,45,58,.4);
}

.pr-row.black-row { background: rgba(0,0,0,.2); }
.pr-row.c-row { border-bottom: 2px solid rgba(212,22,60,.25); }

.pr-cell {
  border-right: 1px solid rgba(45,45,58,.25);
  cursor: crosshair;
}

.pr-cell.beat-start { border-right: 1px solid rgba(212,22,60,.2); }
.pr-cell:hover { background: rgba(212,22,60,.06); }

.pr-note {
  position: absolute;
  border-radius: 2px;
  cursor: pointer;
  z-index: 2;
  opacity: .88;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 7px;
  color: rgba(255,255,255,.8);
  overflow: hidden;
  pointer-events: auto;
}

.pr-note:hover {
  opacity: 1;
  box-shadow: 0 0 6px rgba(255,255,255,.2);
}

.pr-playhead {
  position: absolute;
  top: 0;
  width: 2px;
  background: var(--green);
  z-index: 10;
  pointer-events: none;
  box-shadow: 0 0 6px rgba(34,197,94,.5);
}

/* ---- Arrangement ---- */
.arr-toolbar {
  margin-bottom: 10px;
  display: flex;
  gap: 8px;
}

.toggle-inline {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
}

.toggle-inline input { accent-color: var(--accent); }

#arrangementTrack {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  min-height: 40px;
  background: var(--bg);
  border-radius: 6px;
  padding: 8px;
  border: 1px solid var(--border);
}

.arr-block {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  min-width: 80px;
  text-align: center;
  border: 2px solid transparent;
  color: #fff;
}

.arr-block:hover { filter: brightness(1.2); }

.arr-block .arr-remove {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  font-size: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity .15s;
  line-height: 1;
}

.arr-block:hover .arr-remove { opacity: 1; }
.arr-block.current { border-color: var(--green); }

/* ---- Mixer ---- */
#mixer {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: flex-end;
  overflow-x: auto;
  padding-bottom: 4px;
}

.mix-ch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--bg);
  padding: 10px 8px;
  border-radius: 6px;
  min-width: 60px;
  border: 1px solid var(--border);
}

.mix-ch.master {
  border-color: var(--accent);
  background: rgba(212,22,60,.07);
}

.mix-ch-label {
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  max-width: 55px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}

.mix-ch input[type="range"].vol-slider {
  writing-mode: vertical-lr;
  direction: rtl;
  height: 70px;
  width: 4px;
}

.mix-ch .vol-val {
  font-size: 11px;
  color: var(--accent2);
  font-weight: 700;
}

.mix-ch .pan-knob {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 2px;
}

.mix-ch .pan-knob input[type="range"] {
  writing-mode: horizontal-tb;
  direction: ltr;
  height: 3px;
  width: 48px;
}

.mix-ch .pan-knob span {
  font-size: 8px;
  color: var(--text-dimmer);
}

.mix-btns { display: flex; gap: 3px; }

.mix-btn {
  padding: 2px 6px;
  font-size: 9px;
  border-radius: 3px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
}

.mix-btn.muted { background: var(--red); color: #fff; border-color: var(--red); }
.mix-btn.soloed { background: var(--orange); color: #000; border-color: var(--orange); }

/* ---- Effects ---- */
#effectsChain {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.fx-unit {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
}

.fx-unit.active { border-color: var(--accent); }

.fx-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.fx-header h4 { font-size: 13px; color: var(--accent2); }

.fx-toggle {
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: var(--surface3);
  border: none;
  cursor: pointer;
  position: relative;
  transition: background .2s;
}

.fx-toggle.on { background: var(--green); }

.fx-toggle::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  top: 2px;
  left: 2px;
  transition: left .2s;
}

.fx-toggle.on::after { left: 18px; }

.fx-params {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fx-param {
  display: flex;
  align-items: center;
  gap: 8px;
}

.fx-param label {
  font-size: 11px;
  color: var(--text-dim);
  min-width: 55px;
}

.fx-param input[type="range"] { flex: 1; }

.fx-param span {
  font-size: 11px;
  color: var(--accent2);
  min-width: 42px;
}

.fx-param select { font-size: 11px; }

/* ---- Piano / Live Keyboard ---- */
#piano {
  display: flex;
  position: relative;
  height: 100px;
  user-select: none;
  overflow-x: auto;
}

.key { position: relative; cursor: pointer; transition: background .04s; }

.key-white {
  width: 36px;
  height: 100px;
  background: linear-gradient(180deg, #eee, #fff);
  border: 1px solid #bbb;
  border-radius: 0 0 5px 5px;
  z-index: 1;
}

.key-white:hover { background: #ffe0e4; }
.key-white.active { background: var(--accent2); }

.key-black {
  width: 22px;
  height: 64px;
  background: linear-gradient(180deg, #222, #111);
  border: 1px solid #000;
  border-radius: 0 0 3px 3px;
  margin-left: -11px;
  margin-right: -11px;
  z-index: 2;
}

.key-black:hover { background: #333; }
.key-black.active { background: var(--accent); }

.key-label {
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 8px;
  color: #999;
  pointer-events: none;
}

.key-black .key-label { color: #555; bottom: 3px; }

.hint {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-dimmer);
  text-align: center;
}

.hidden { display: none !important; }

/* ---- Modals ---- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden { display: none; }

.modal-content {
  background: var(--surface);
  padding: 24px;
  border-radius: 12px;
  min-width: 320px;
  max-width: 90vw;
  max-height: 80vh;
  overflow-y: auto;
  border: 1px solid var(--border);
}

.modal-content h3 {
  margin-bottom: 16px;
  color: var(--accent2);
}

.modal-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal-form input[type="text"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  margin: 12px 0;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--orange));
  border-radius: 3px;
  width: 0%;
  transition: width .3s;
}

#exportStatus {
  font-size: 12px;
  color: var(--text-dim);
}

/* ---- Project List ---- */
.project-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 10px;
  border-radius: 6px;
  margin-bottom: 4px;
  background: var(--surface2);
  cursor: pointer;
}

.project-item:hover { background: var(--surface3); }

.proj-name { font-weight: 600; }

.proj-date {
  font-size: 11px;
  color: var(--text-dim);
}

.proj-del {
  color: var(--red);
  cursor: pointer;
  font-size: 16px;
  padding: 0 4px;
}

/* ---- Shortcuts ---- */
.shortcuts-list dt {
  font-weight: 600;
  color: var(--accent2);
  margin-top: 8px;
}

.shortcuts-list dd {
  color: var(--text-dim);
  margin-left: 12px;
  margin-bottom: 4px;
  font-size: 13px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .transport { gap: 4px; }
  .header-top { flex-direction: column; gap: 8px; }
  .step { width: 18px; height: 18px; }
  .step-numbers span { width: 18px; font-size: 7px; }
  #pianoRollWrap { height: 240px; }
  .key-white { width: 28px; height: 80px; }
  .key-black { width: 18px; height: 50px; margin-left: -9px; margin-right: -9px; }
  .mix-ch input[type="range"].vol-slider { height: 50px; }
  #effectsChain { grid-template-columns: 1fr; }
}