:root {
  --panel: rgba(17, 25, 68, 0.9);
  --border: rgba(74, 101, 196, 0.42);
  --text: #eef4ff;
  --muted: #aab8ea;
  --playhead: #ffd34f;
  --shadow: 0 12px 28px rgba(0, 0, 0, 0.26);
  --radius-lg: 18px;
  --radius-md: 12px;
  --track-lead: #1ea3da;
  --track-counter: #4fb6ff;
  --track-bass: #45c280;
  --track-drums: #ff9454;
  --track-percussion: #f0c44f;
  --track-pad: #7fd7a8;
  --track-chords: #8e7cff;
  --track-arp: #ff71c6;
  --track-fx: #6ed9d1;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #0a1a59 0%, #07113a 45%, #061033 100%);
  color: var(--text);
}

body {
  min-height: 100vh;
}

.app {
  max-width: 1500px;
  margin: 0 auto;
  padding: 20px;
  display: grid;
  grid-template-areas:
    "topbar"
    "global"
    "tabs"
    "track"
    "helpers"
    "fx"
    "workspace"
    "footer";
  gap: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.topbar {
  grid-area: topbar;
  padding: 4px 4px 0;
}

.topbar h1 {
  margin: 0;
  font-size: 1.9rem;
  color: #eef3ff;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
}

.global-panel {
  grid-area: global;
  padding: 14px 16px;
}

.helpers-panel {
  grid-area: helpers;
  padding: 16px;
}

.fx-panel {
  grid-area: fx;
  padding: 16px;
}

.track-panel {
  grid-area: track;
  padding: 14px 16px;
  display: grid;
  gap: 14px;
}

.panel-title-row {
  display: grid;
  gap: 4px;
  margin-bottom: 12px;
}

.panel-title-row h2,
.track-panel-header h2 {
  margin: 0;
  font-size: 1.15rem;
}

.panel-subtitle,
.track-mini-status {
  color: var(--muted);
  font-size: 0.92rem;
}

.control-grid,
.track-controls,
.fx-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  align-items: center;
}

.helpers-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 14px;
}

.helper-card {
  background: linear-gradient(180deg, rgba(38, 52, 110, 0.96) 0%, rgba(27, 39, 88, 0.96) 100%);
  border: 1px solid rgba(81, 105, 199, 0.45);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 12px;
}

.helper-card h3 {
  margin: 0;
  font-size: 1rem;
}

.helper-buttons {
  display: grid;
  gap: 8px;
}

.helper-buttons button {
  width: 100%;
  min-height: 42px;
}

.helper-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.helper-text {
  color: var(--muted);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: max-content;
}

.control-group.wide {
  min-width: 320px;
}

.control-group label {
  color: var(--muted);
  white-space: nowrap;
  font-size: 0.95rem;
}

button,
select,
input[type="range"] {
  font: inherit;
}

button {
  border: 1px solid rgba(36, 164, 217, 0.35);
  border-radius: 999px;
  padding: 12px 18px;
  color: #f3fbff;
  background: linear-gradient(180deg, #1681b5 0%, #106b9c 100%);
  cursor: pointer;
  transition: transform 0.08s ease, filter 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.22);
}

button:hover {
  filter: brightness(1.08);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.28);
}

button:active {
  transform: translateY(1px);
}

select {
  min-width: 150px;
  color: #f3f7ff;
  background: linear-gradient(180deg, rgba(50, 66, 138, 0.98) 0%, rgba(31, 43, 97, 0.98) 100%);
  border: 1px solid rgba(138, 168, 255, 0.55);
  border-radius: 12px;
  padding: 10px 14px;
  outline: none;
  appearance: auto;
}

select:focus {
  border-color: #9ec0ff;
  box-shadow: 0 0 0 3px rgba(126, 162, 255, 0.18);
}

select option {
  color: #07113a;
  background: #f4f7ff;
}

input[type="range"] {
  accent-color: #1ea1e3;
  width: 180px;
}

.track-tabs {
  grid-area: tabs;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tab-btn {
  min-width: 92px;
  min-height: 42px;
  padding: 9px 16px;
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(38, 52, 110, 0.98) 0%, rgba(27, 39, 88, 0.98) 100%);
  border: 1px solid rgba(81, 105, 199, 0.45);
  color: #d9e3ff;
  font-weight: 600;
}

.tab-btn.active {
  background: linear-gradient(180deg, #4262bf 0%, #304c9d 100%);
  border-color: rgba(145, 171, 255, 0.7);
  box-shadow: 0 0 0 2px rgba(99, 132, 255, 0.16);
}

.workspace {
  grid-area: workspace;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 16px;
  align-items: start;
}

.grid-section {
  padding: 14px;
  overflow-x: auto;
  min-height: 560px;
}

.action-panel {
  padding: 14px;
  display: grid;
  gap: 10px;
  align-content: start;
  position: sticky;
  top: 16px;
}

.action-panel button {
  width: 100%;
  min-height: 48px;
  font-weight: 600;
}

.grid-header {
  display: grid;
  grid-template-columns: 84px auto;
  gap: 8px;
  margin-bottom: 8px;
}

.corner-cell {
  min-width: 84px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #d5e1ff;
  background: linear-gradient(180deg, rgba(47, 61, 127, 0.95) 0%, rgba(35, 48, 106, 0.98) 100%);
  border: 1px solid rgba(82, 110, 212, 0.4);
  border-radius: 10px;
  position: sticky;
  left: 0;
  z-index: 4;
}

.step-labels {
  display: grid;
  gap: 6px;
  min-width: max-content;
}

.step-label {
  height: 36px;
  min-width: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #c9d8ff;
  background: linear-gradient(180deg, rgba(39, 53, 114, 0.98) 0%, rgba(28, 40, 94, 0.98) 100%);
  border: 1px solid rgba(76, 103, 197, 0.38);
  border-radius: 10px;
  font-size: 0.88rem;
}

.step-label.playhead {
  border-color: var(--playhead);
  box-shadow: inset 0 0 0 2px var(--playhead);
  color: #fff3c4;
}

.grid {
  display: grid;
  gap: 6px;
  min-width: max-content;
}

.note-label {
  height: 42px;
  min-width: 84px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #d6e2ff;
  background: linear-gradient(180deg, rgba(42, 57, 120, 0.98) 0%, rgba(32, 44, 98, 0.98) 100%);
  border: 1px solid rgba(78, 106, 200, 0.42);
  border-radius: 10px;
  position: sticky;
  left: 0;
  z-index: 3;
  font-size: 0.92rem;
}

.note-label.root {
  color: #fff3c4;
  border-color: rgba(255, 211, 77, 0.65);
}

.note-label.third {
  color: #d8f5ff;
}

.note-label.fifth {
  color: #def8e8;
}

.note-label.track-lead::before,
.note-label.track-counter::before,
.note-label.track-bass::before,
.note-label.track-drums::before,
.note-label.track-percussion::before,
.note-label.track-pad::before,
.note-label.track-chords::before,
.note-label.track-arp::before,
.note-label.track-fx::before {
  content: "";
  width: 6px;
  height: 24px;
  border-radius: 999px;
  margin-right: 8px;
  display: inline-block;
}

.note-label.track-lead::before { background: var(--track-lead); }
.note-label.track-counter::before { background: var(--track-counter); }
.note-label.track-bass::before { background: var(--track-bass); }
.note-label.track-drums::before { background: var(--track-drums); }
.note-label.track-percussion::before { background: var(--track-percussion); }
.note-label.track-pad::before { background: var(--track-pad); }
.note-label.track-chords::before { background: var(--track-chords); }
.note-label.track-arp::before { background: var(--track-arp); }
.note-label.track-fx::before { background: var(--track-fx); }

.cell {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid rgba(49, 84, 185, 0.5);
  background: linear-gradient(180deg, rgba(6, 15, 48, 0.98) 0%, rgba(8, 18, 55, 0.98) 100%);
  box-shadow: inset 0 0 0 1px rgba(24, 49, 120, 0.16);
  cursor: pointer;
  transition: background 0.12s ease, box-shadow 0.12s ease, transform 0.05s ease, border-color 0.12s ease;
  touch-action: none;
}

.cell:hover {
  transform: scale(1.02);
  border-color: rgba(98, 132, 235, 0.72);
}

.cell.active {
  background: linear-gradient(180deg, #1ea3da 0%, #147fb7 100%);
  border-color: rgba(116, 231, 255, 0.65);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 0 14px rgba(31, 158, 214, 0.35);
}

.cell.accent {
  background: linear-gradient(180deg, #ff8adf 0%, #a24fff 100%);
  border-color: rgba(255, 204, 242, 0.84);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 0 18px rgba(210, 108, 255, 0.34);
}

.cell.playhead {
  border-color: var(--playhead);
  box-shadow: inset 0 0 0 2px var(--playhead);
}

.cell.active.playhead,
.cell.accent.playhead {
  border-color: #ffe080;
}

.grid-help {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer {
  grid-area: footer;
  padding: 2px 4px 0;
}

#statusText {
  margin: 0;
  color: var(--muted);
}

.inline-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.inline-toggle input[type="checkbox"] {
  width: 18px;
  height: 18px;
}

.value-label {
  min-width: 48px;
  color: #d8e5ff;
  font-weight: 600;
}

@media (max-width: 1250px) {
  .helpers-grid {
    grid-template-columns: repeat(2, minmax(240px, 1fr));
  }
}

@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .action-panel {
    position: static;
    grid-template-columns: repeat(2, minmax(160px, 1fr));
  }
}

@media (max-width: 920px) {
  .control-grid,
  .track-controls,
  .fx-grid {
    flex-direction: column;
    align-items: stretch;
  }

  .control-group,
  .control-group.wide {
    min-width: 0;
    width: 100%;
  }

  select,
  input[type="range"] {
    width: 100%;
    min-width: 0;
  }

  .helpers-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .app {
    padding: 14px;
  }

  .action-panel {
    grid-template-columns: 1fr;
  }

  .corner-cell,
  .note-label {
    min-width: 72px;
  }

  .grid-header {
    grid-template-columns: 72px auto;
  }
}